Active filters amplify desired signals while rejecting unwanted frequencies, and can be tailored to meet application-specific requirements in electronics.
Amplifiers boost signal strength, match impedance levels, and are essential in many circuit systems, including audio, broadcasting, and telecommunications.
Batteries store and provide electrical energy, come in various types and sizes for multiple uses, rechargeable or single-use.
Capacitors store electrical charge with metallic plates and a dielectric; types vary and can be combined for specific circuit characteristics.
Chip carriers and sockets provide an interface between components and PCBs, enabling easy replacement or upgrading without soldering.
Circuit protection devices prevent damage from overcurrent flow, including fuses, breakers, surge protectors, and voltage regulators.
Connector accessories and support devices aid connector function and longevity, including backshells, grips, clamps, and ties; must be compatible with connector type.
Connectors join electronic circuits to transfer signals and power, come in various sizes and shapes, and include support accessories.
Converters transform DC input to another voltage level, essential in electronic systems, renewable energy, and automotive electronics.
Crystals and resonators generate and stabilize frequency signals via piezoelectricity. They are used in timing, frequency control, and filters. Crystals are quartz and resonators are ceramic with a built-in capacitor.
Semiconductor diodes control current flow in one direction (uni-directionality) via low resistance. Useful for rectification, voltage regulation, detection, and digital logic.
Discover essential electronic components for your devices, including CPU accelerators, system cache controllers, computer processors, motherboards, and graphics computing systems. Enhance device performance and connectivity with reliable components engineered for seamless integration and optimal functionality.
Fiber optics use light pulses to transmit data over long distances. They have superior bandwidth capacity, low signal attenuation, and secure physical properties. They are essential in telecommunications networks today.
Filters enhance signal processing by selectively passing desired frequencies while suppressing unwanted ones. Filters can be passive (using capacitors, resistors, and inductors) or active (using transistors or amplifiers).
Flash devices are non-volatile storage solutions that offer fast read and write speeds, making them ideal for applications requiring high-speed data transfer. These devices utilize flash memory technology, providing reliable storage for data-intensive tasks such as gaming, multimedia, and enterprise-level applications.
General purpose ICs consist of multiple individual circuits or components (e.g., logic gates, amplifiers, oscillators, etc.) that are combined onto a single integrated circuit chip for a smaller physical footprint.
I/O and storage controllers are crucial components in computer systems, managing input/output operations and storage devices. These controllers facilitate efficient data transfer between peripherals, storage drives, and the central processing unit (CPU), enhancing system performance and enabling seamless connectivity.
Inductors store energy in magnetic fields, oppose sudden changes in current flow and prevent electrical surges. Common inductor applications include power supplies, signal filters, and oscillators.
Interface ICs allow efficient device connectivity with high-speed data transfer and low power consumption.They can be ASIC or FPGA types, and may perform additional functions such as sensing, storage, and conversion.
Logic ICs can be used for storage, memory, amplification, and multiplexing. They perform fundamental logical operations on digital input signals (1, 0, H, L) to generate a corresponding digital output signal.
Memory modules are essential components in electronic devices, storing data temporarily or permanently for processing and retrieval. From volatile RAM (Random Access Memory) to non-volatile ROM (Read-Only Memory), memory technologies vary in speed, capacity, and functionality, catering to diverse application requirements.
Memory ICs store digital data and retain the information even when the power is turned off. They come in various types, like RAM (Random Access Memory) for fast data access, and ROM (Read-Only Memory) for permanent data storage.
Miscellaneous semiconductor components are a diverse category of electronic components that combines elements from a mix of component devices.
Optoelectronic devices interact with light. This family of devices can emit light, detect light, generate current, and transmit light signals for long-distance communication.
Oscillators generate repetitive waveforms, such as sine, square, or triangle waves. They are commonly used to produce stable and precise frequencies for applications like clocks, signal generation, and communication systems.
Other Function Semiconductor components are a diverse category of semiconductor components that perform a range of specialized functions.
Passive component networks operate without a power source and support data transmission within system by performing filtering, energy storage, and/or signal coupling functions.
Peripheral ICs (Integrated Circuits) are designed to control and manage the peripheral devices connected to a computer or other electronic device.
Programmable Logic ICs are user-programmable devices that allow designers to create custom logic circuits. These cost saving ICs offer real-time data processing and maximum design flexibilty.
RF (Radio Frequency) and microwave devices are used in telecommunications, wireless communications, and electronic systems. These devices include amplifiers, attenuators, filters, mixers, oscillators, and antennas, and a host of other components.
Voltage regulators are used to ensure a constant output voltage despite power fluctuations and load changes. Linear and switching regulators are common types used to maintain voltage stability.
Relays are electromagnetic switches that are used to control the flow of electrical current in an electrical circuit. Relays are a safe means of providing isolation between a controlling circuit and a controlled circuit.
Resistors control the flow of electrical current in a circuit by introducing a set resistance. These passive components reduce current flow, adjust signal levels, and bias active elements in circuits.
Transducers convert energy from one form to another and are crucial in sensing, audio and control systems. They transform physical measures like temperature, pressure, or sound into electrical signals for circuits.
Storage drives are hardware devices used to store and retrieve digital data in computers and electronic devices. These drives come in various forms, including hard disk drives (HDDs), solid-state drives (SSDs), and hybrid drives, offering different levels of capacity, speed, and durability to suit specific storage needs.
Storage media encompass physical or digital mediums used for storing and preserving digital data. From optical discs and magnetic tapes to USB flash drives and memory cards, storage media come in diverse formats and capacities, offering flexibility and reliability for data storage and archival purposes.
Storage systems comprise hardware and software components designed to manage and store digital data efficiently. These systems range from simple standalone devices to complex network-attached storage (NAS) and storage area network (SAN) solutions, providing scalable storage capacity and data protection features for businesses and enterprises.
Switches control electrical current flow by making or breaking connections. These devices vary in design and application, from basic on/off switches to complex industrial automation systems.
Telecom integrated circuits (ICs) are specialized electronics for telecommunications, tailored to high data rates, low power use, and reliable long-distance transmission. These devices include amplifiers, filters, ADCs, DACs, and more-- and they are often integrated on one chip for specific telecom tasks.
Terminal blocks, or connection terminals, are modular blocks that bring together multiple electrical wires at one connection point. They offer a reliable, organized way to terminate cables.
Thermal management devices control heat in electronic systems, preventing overheating and ensuring optimal performance and reliability. Examples include heat sinks, fans, and thermal interface materials that dissipate or transfer heat away from components.
Transformers are devices that alter electrical voltage levels between circuits through electromagnetic induction. They are vital in power distribution, converting high-voltage electricity for transmission and lower voltage for safe usage.
Transistors are 3-layer semiconductor devices that regulate the flow of electrical current. They function as amplifiers, boosting weak signals, and as switches, controlling the flow of current between terminals.
Triggering devices initiate electronic processes or events in response to specific conditions. These devices support many automated tasks such as activating switches and signals, or turning on lights when motion is detected.
Video cards, also known as graphics cards or GPU (Graphics Processing Unit), are essential components in computers, responsible for rendering graphics and images on display devices. These cards feature dedicated processors and memory, delivering smooth and immersive visual experiences for gaming, multimedia, and professional applications.
Choose from over than a million of proven quality materials. Over 300 manufacturers are presented. From renowned major international players to small independent companies with a proven track record in local markets.
Featured manufacturers
74AC244TTR by STMicroelectronics is a CMOS bus driver with a propagation delay of just 10 ns, supporting dual 4-bit functions. It operates at supply voltages from 2V to 6V and features a compact SOIC package, ideal for high-speed data transmission in military applications.
Median Price
-
Lifecycle Status
Suppliers In-Stock
3
In-Stock Inventory
1k+
Vyrian
1+ parts
100+ parts
1k+ parts
10k+ parts
Digiode
Anansix
Native Components
$0.558
Northwest PG Solutions
$0.614
Andel Nordic
$3.228
$3.099
Microchip USA
$10.517
AZTECH Wire
$17.120
IDEA Electronic Components Group
$19.508
$17.557
MKK Technologies
$36.683
DigiPath Technology Company
Parana Technologies
$23.324
Corphita
Durable plastic/epoxy construction ensures reliability and performance in various environments.
Low propagation delay enhances speed and efficiency, making it suitable for high-speed applications.
Surface mount technology allows for compact design and easy integration into modern circuit boards.
Dual functionality maximizes utility and cost-effectiveness by providing more features in a single device.
Rectangular package shape is space-efficient, optimizing layout on the PCB.
A 4-bit configuration supports efficient data handling in applications requiring moderate data width.
Operates at 3.3V, which is standard for many logic devices, ensuring compatibility with a wide range of systems.
Supports both 3.3V and 5V power supplies, providing flexibility for use in varying device environments.
A 20-terminal configuration offers ample connectivity options for complex circuits.
Thin profile and shrink pitch design enables easy placement on densely populated circuit boards.
High output current capacity allows it to drive larger loads, making it suitable for power-intensive applications.
Competitive propagation delay ensures rapid signal transitions, improving overall speed in data processing.
Can operate in high-temperature environments, suitable for demanding industrial applications.
3-state outputs provide flexibility for bus applications, allowing multiple devices to share the same communication lines.
Capable of functioning in extreme cold, making it ideal for military and aerospace applications.
High-quality terminal finish ensures excellent conductivity and corrosion resistance, enhancing long-term reliability.
Dual terminal positioning optimizes space and layout on circuit boards, enabling more compact designs.
Having two ports allows for dual data lines, making it easier to manage connections in complex circuits.
The low seated height accommodates tight spaces in small electronic devices.
Compact width fits well in space-constrained applications without compromising performance.
True output polarity enhances signal integrity in digital systems.
Low minimum supply voltage allows for energy-efficient operation across various devices.
Short length contributes to a compact footprint, facilitating minimal board space usage.
MIL-grade temperature classification ensures robustness and reliability in critical applications.
CMOS technology provides low power consumption and high integration capabilities, ideal for modern designs.
Gull wing terminals enable easy soldering and enhance reliability in board assembly.
Tape and reel packaging simplifies automated assembly and improves handling for bulk applications.
Narrow terminal pitch enables more components to be placed on the PCB, maximizing functionality.
Low-enable control provides easy interfacing with microcontrollers and other digital logic devices.
A maximum supply voltage of 6V allows for flexibility in power source selection across different applications.
Bus Driver & Transceivers 74AC244TTR attributes and parameters. Explore more Bus Driver & Transceivers devices from STMicroelectronics
Control Type:
Family:
JESD-30 Code:
JESD-609 Code:
Length:
Logic IC Type:
Maximum I (ol):
No. of Bits:
No. of Functions:
No. of Ports:
No. of Terminals:
Maximum Operating Temperature:
Minimum Operating Temperature:
Output Characteristics:
Output Polarity:
Package Body Material:
Package Code:
Package Equivalence Code:
Package Shape:
Package Style (Meter):
Packing Method:
Power Supplies (V):
Propagation Delay At Nominal Supply:
Propagation Delay (tpd):
Qualification:
Maximum Seated Height:
Sub-Category:
Maximum Supply Voltage (Vsup):
Minimum Supply Voltage (Vsup):
Nominal Supply Voltage / Vsup (V):
Surface Mount:
Technology:
Temperature Grade:
Terminal Finish:
Terminal Form:
Terminal Pitch:
Terminal Position:
Width:
74AC244TTR Logic ICs trade compliance attributes, and parameters.
HTS
8542.39.00.01
SB
8542.39.00.00
STMicroelectronics is a global leader in the semiconductor manufacturing industry, with over 35 years of experience providing innovative and advanced technologies for customers around the world. Headquartered in Netherlands, STMicroelectronics has more than 51,323 employees worldwide and operates across 32 countries all over Europe, Asia-Pacific and the Americas. The company’s portfolio includes integrated circuits, discrete components, application-specific standard products, and computer chipsets. STMicroelectronics serves a wide range of industries such as automotive, consumer markets, healthcare and industrial applications.
President, CEO
Jean-Marc Chery
President, CFO, Finance, Purchasing,Enterprise Risk Management & Resilience
Lorenzo Grandi
President, Sales & Marketing
Jerome Roux
Castelletto
Fabrication
Fab Initiation
1968
Italy
Wafer Capacity
SGFAB AMK 6
2000
Singapore
29,000
AG200
Agrate Brianza
14,000
RST 8
France
Rousset
35,000
Crolles 1
1993
Crolles
30,000
Crolles 2-ext. mod 5
Crolles 2-ext. mod 2
2022
Crolles 2-ext. mod 3
2023
Crolles 2
2004
28,000
1985
SiC Fab
2006
Sweden
Norrköping
10,000
Fab 3
2005
Tours
2,000
Fab 1 & Fab 2
1978
55,000
Fab 2
1997
Catania
SGFAB-AMK 6E
2003
145,000
SGFAB-AMJ 9
1984
152,000
AG300 (R3)
1980
25,000
1987
34,000
AG300
2024
Crolles 2-ext. mod 1
2020
Fab 1 6-inch fab
2013
11,000
SiC 6-inch line
2021
2,500
200mm GaN
2018
SGFAB-AMK 8
2001
Crolles 2- JV Fab
SGFAB-AMK 6
2016
38,125
SGFAB-AMK 2E
2010
20,000
Silicon Carbide A.B.
SiC wafer/EPI Fab
SiC Device Fab
2025
LM358N
NXP Semiconductors
OPERATIONAL AMPLIFIER; Temperature Grade: COMMERCIAL; Terminal Form: THROUGH-HOLE; No. of Terminals: 8; Package Code: DIP; Package Shape: RECTANGULAR;
1N4148WS
Taiwan Semiconductor
RECTIFIER DIODE; Terminal Position: DUAL; Terminal Form: FLAT; No. of Terminals: 2; Surface Mount: YES; Package Shape: RECTANGULAR;
Vishay Intertechnology
Vishay Intertechnology's 1N4148WS is a single rectifier diode with a max forward voltage of 1V and output current of 0.15A. With a fast reverse recovery time of 0.004us, it operates up to 150°C. Ideal for applications requiring high-speed switching and low power consumption in surface mount configurations.
1N4148
Toshiba
RECTIFIER DIODE; Terminal Position: AXIAL; Terminal Form: WIRE; No. of Terminals: 2; Surface Mount: NO; Package Shape: ROUND;
Won-top Electronics
SMBJ18CA
Bourns
TRANS VOLTAGE SUPPRESSOR DIODE; Terminal Position: DUAL; Terminal Form: C BEND; No. of Terminals: 2; Surface Mount: YES; Package Shape: RECTANGULAR;
ROHM
FDD5614P
Onsemi
FDD5614P by Onsemi is a P-CHANNEL Power FET with 60V DS Breakdown Voltage, ideal for SWITCHING applications. It features 45A IDM and 0.1 ohm RDS(ON), operating in ENHANCEMENT MODE at up to 175°C. The PLASTIC/EPOXY package with GULL WING terminals ensures efficient heat dissipation and reliable performance.
LM358MX
National Semiconductor
OPERATIONAL AMPLIFIER; Temperature Grade: COMMERCIAL; Terminal Form: GULL WING; No. of Terminals: 8; Package Code: SOP; Package Shape: RECTANGULAR;
BAV99
Temic Semiconductors
RECTIFIER DIODE; Terminal Position: DUAL; Terminal Form: GULL WING; No. of Terminals: 3; Surface Mount: YES; Package Shape: RECTANGULAR;
MC7805CTG
MC7805CTG by Onsemi is a fixed positive single output standard regulator with an output voltage of 5V and max current of 1A. It operates in temperatures ranging from 0 to 125°C, making it suitable for various applications requiring stable voltage regulation. The package style is flange mount with through-hole terminals, ensuring easy installation and reliability in diverse electronic designs.
Motorola
LM555CM
Renesas Electronics
Analog Waveform Generation Functions; Temperature Grade: COMMERCIAL; No. of Terminals: 8; Package Code: SOP; Package Shape: RECTANGULAR; Surface Mount: YES;
M39029/56-351
TE Connectivity
TE Connectivity's M39029/56-351 is a CRIMP contact type backshell accessory with rated voltage of 115V. It operates b/w -65 to 175 °C, suitable for MIL-C-39029/56 connectors with wire gauge ranging from 28 to 22 AWG. Ideal for military applications requiring female contacts and copper alloy material.
International Semiconductor
Nte Electronics
ULN2803A
NPN; Configuration: 8 BANKS, DARLINGTON WITH BUILT-IN DIODE AND RESISTOR; Surface Mount: NO; Maximum Collector Current (IC): .5 A; Terminal Position: DUAL; JESD-30 Code: R-PDIP-T18;
2N2222A
NPN; Configuration: SINGLE; Surface Mount: NO; Nominal Transition Frequency (fT): 300 MHz; Maximum Power Dissipation (Abs): .5 W; Maximum Collector Current (IC): .5 A;
MBR0540T1G
MBR0540T1G by Onsemi is a Schottky rectifier diode with max. forward voltage of 0.62V and max. output current of 0.5A, ideal for applications requiring high efficiency power conversion in small outline packages. Operating temp range: -55 to 150°C, with peak reflow temp at 260°C, making it suitable for various electronic devices needing reliable rectification performance in compact designs.
Eic Semiconductor
SN74ABT125DR
Texas Instruments
SN74ABT125DR by Texas Instruments is a 4-function bus driver with 4.9 ns propagation delay at 5V. It has a small outline package, operates in industrial temperature range (-40 to 85 °C), and features TRUE output polarity. Ideal for applications requiring fast signal transmission and low power consumption.
74HC1G125GW,118
Nexperia
BUS DRIVER; Temperature Grade: AUTOMOTIVE; Terminal Form: GULL WING; No. of Terminals: 5; Package Code: TSSOP; Package Shape: RECTANGULAR;
TXU0304RUTR
TXU0304RUTR by Texas Instruments is a 4-bit bus driver with 12 terminals, operating at -40 to 125 °C. It features a propagation delay of 60 ns, Schmitt Trigger, and output polarity TRUE. Ideal for applications requiring low power consumption and compact design in electronics.
74ACT244SCX
BUS DRIVER; Temperature Grade: INDUSTRIAL; Terminal Form: GULL WING; No. of Terminals: 20; Package Code: SOP; Package Shape: RECTANGULAR;
SN74LS373DW
BUS DRIVER; Temperature Grade: COMMERCIAL; Terminal Form: GULL WING; No. of Terminals: 20; Package Code: SOP; Package Shape: RECTANGULAR;
SN74LVCC3245ADBR
SN74LVCC3245ADBR by Texas Instruments is an 8-bit bus driver with 3V & 3/5V translation, featuring a propagation delay of 7.6 ns and output characteristics in a small outline package. Ideal for bidirectional control applications requiring common control, it operates at temperatures ranging from -40 to 85 °C with a supply voltage of 2.3-3.6 V.
SN74LVC2T45DCUT
SN74LVC2T45DCUT by Texas Instruments is a 2-bit bus driver with 17.7 ns propagation delay, operating at 1.8V nominal voltage. It features a small outline package and is ideal for bidirectional control applications in industrial settings due to its low power consumption and wide temperature range of -40 to 85°C.
CD74AC574M96
Harris Semiconductor
BUS DRIVER; Temperature Grade: MILITARY; Terminal Form: GULL WING; No. of Terminals: 20; Package Code: SOP; Package Shape: RECTANGULAR;
SN74LVC125ADT
SN74LVC125ADT by Texas Instruments is a 4-function bus driver with a propagation delay of 6 ns and operates at a nominal voltage of 1.8V. It features a small outline package style, true output polarity, and is suitable for automotive applications due to its temperature grade.
SN74LVC573APWRG4
SN74LVC573APWRG4 by Texas Instruments is an 8-bit bus driver with a propagation delay of 6.9 ns at 3.3V, suitable for automotive applications. It features a max operating temperature of 125°C, output polarity TRUE, and a terminal pitch of 0.65 mm.
SN74HC244DBR
SN74HC244DBR by Texas Instruments is a 4-bit bus driver with 29ns propagation delay, suitable for industrial applications. It features 3-STATE output characteristics, operates at a supply voltage of 5V, and has a max power supply current of 0.08mA. This CMOS technology device comes in a small outline package with dual terminals and enables low control type.
74AVC8T245PW,118
NXP Semiconductors' 74AVC8T245PW,118 is an 8-bit bus driver with a propagation delay of 9 ns at nominal voltage. It operates at a range of 1.2-3.3V and supports translation b/w 1.5/3.3V levels, making it suitable for automotive applications requiring bidirectional control in small form factors.
SN74ACT245PWR
SN74ACT245PWR by Texas Instruments is an 8-bit bus driver with a propagation delay of 9ns at 5V. It features a small outline package, operates in industrial temperature range (-40 to 85°C), and has a max power supply current of 0.04mA. Ideal for bidirectional data transfer applications requiring fast signal propagation and low power consumption.
SN74ABT245BDWR
SN74ABT245BDWR by Texas Instruments is a bus driver & transceiver with 8 bits and a propagation delay of 3.9 ns. It operates at a nominal voltage of 5V and has a small outline package style. This IC is commonly used in bidirectional control applications requiring fast data transmission.
74LCX16245MTDX
Rochester Electronics
BUS TRANSCEIVER; Temperature Grade: INDUSTRIAL; Terminal Form: GULL WING; No. of Terminals: 48; Package Code: TSSOP; Package Shape: RECTANGULAR;
74LVX4245MTCX
Fairchild Semiconductor
BUS TRANSCEIVER; Temperature Grade: INDUSTRIAL; Terminal Form: GULL WING; No. of Terminals: 24; Package Code: TSSOP; Package Shape: RECTANGULAR;
SN74LVC2G126DCUR
SN74LVC2G126DCUR by Texas Instruments is a 2-function bus driver with a propagation delay of 4 ns at 1.8V, suitable for automotive applications. It features a max operating temperature of 125°C, output polarity TRUE, and terminal finish Matte Tin (Sn). This CMOS technology device has a small outline package style with very thin profile and shrink pitch.
PCA9543APW,118
PCA9543APW,118 by NXP Semiconductors is a bus driver with 2 ports and 14 terminals. It operates at a supply voltage of 4.5-5.5V, has a propagation delay of 0.3ns, and can withstand temperatures from -40 to 85°C. Ideal for industrial applications requiring bidirectional control in compact spaces.
SN74LVC1G125DBVR
SN74LVC1G125DBVR by Texas Instruments is a 3.3V bus driver with 4.7ns propagation delay, suitable for automotive applications. It features a 50pF load capacitance, 32A max I (ol), and operates in the temperature range of -40 to 125°C. This CMOS technology device has a small outline package with dual terminals and is designed for unidirectional control with low power consumption.
NC7SZ125P5X
BUS DRIVER; Temperature Grade: INDUSTRIAL; Terminal Form: GULL WING; No. of Terminals: 5; Package Code: TSSOP; Package Shape: RECTANGULAR;
Partstack™ will investigate all reported instances of potential suspect/counterfeit part listings.
74ACT244SCX by Onsemi is a bus driver with 10ns propagation delay, 2 functions, and 4 bits. It operates at a nominal voltage of 5V and has a load capacitance of 50pF. Ideal for industrial applications requiring true output polarity and enable low control type.
74ACT541MTCX
BUS DRIVER; Temperature Grade: INDUSTRIAL; Terminal Form: GULL WING; No. of Terminals: 20; Package Code: TSSOP; Package Shape: RECTANGULAR;
74ACT541MTCX by Onsemi is an 8-bit bus driver with a propagation delay of 7.5 ns at 5V, featuring a small outline package suitable for industrial applications. It offers a max I (ol) of 24A and operates b/w -40 to 85°C, making it ideal for high-speed signal transmission in various electronic systems.
74ACT541SC
BUS DRIVER; Terminal Form: GULL WING; No. of Terminals: 20; Package Code: SOP; Package Shape: RECTANGULAR; Surface Mount: YES;
74ACT16244DGGR
74ACT16244DGGR by Texas Instruments is a bus driver & transceiver with 4 functions, 9.5 ns propagation delay, and 48 terminals. It operates at a nominal voltage of 5V and has a load capacitance of 50 pF. Ideal for industrial applications requiring true output polarity and low enable control.
74AC541SCX
74ACT16244DGGRG4
74ACT16244DGGRG4 by Texas Instruments is a bus driver & transceiver with 4 functions, 9.5 ns propagation delay, and 24 Amp max I (ol). It operates at a nominal voltage of 5V and has a load capacitance of 50 pF. Ideal for industrial applications requiring fast signal transmission in compact spaces.
74ACT245SCX
BUS TRANSCEIVER; Temperature Grade: INDUSTRIAL; Terminal Form: GULL WING; No. of Terminals: 20; Package Code: SOP; Package Shape: RECTANGULAR;
74AC541SC
STMicroelectronics
Supply Digital Components
$106.00
$54.25
$11.90
$7.29
Quantity
12,000 In-Stock
Total price ≈ $80,197.29
© 2023 All rights reserved