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
OPERATIONAL AMPLIFIER; Temperature Grade: COMMERCIAL; Terminal Form: GULL WING; No. of Terminals: 14; Package Code: SOP; Package Shape: RECTANGULAR;
Median Price
$0.246
Lifecycle Status
Suppliers In-Stock
64
In-Stock Inventory
1k+
Rochester
1+ parts
$0.090
100+ parts
1k+ parts
10k+ parts
-
Arrow
$0.245
DigiKey
$0.620
$0.343
$0.293
$0.273
Mouser Electronics
$0.650
$0.350
$0.292
$0.268
Verical
Avnet
Future Electronics
$0.215
$0.205
$0.193
DF Sales Co.
$0.160
TEDSS.com
$0.250
Freelance Electronics
$0.265
$0.318
$0.263
Flip Electronics
$0.300
TME
$0.790
$0.490
Digiode
$0.836
Greenchips
$0.893
$0.598
$0.420
$0.358
Component Electronics Inc.
$1.150
$0.870
$0.750
American Microsemiconductor Inc.
$1.350
Nova Conductors
$1.950
Chip Stock
Manoshevitz Elec. Sales
Vyrian
Bristol Electronics
ComSIT Distribution GmbH
ComSIT USA
EPE Components Inc.
Anansix
SIE Connect GmbH - GreenChips
PC Components Company LLC
Mentor Electronics Marketing, LLC
Q Components
Prism Electronics
QIE Inc.
LWI Electronics Inc
MISTER SPROCKETS
Huijzer Components
Electronic Expediters
MRC Electronics
Inventory MP
ABC Electronics Ltd.
Electronics Depot
Cyclops Electronics Ltd
Diverse Electronics
EMSNET
Atlantic Semiconductor
Sunrise Surplus Inc.
R&J Components
A2Z Electronics, Inc.
Technoshack Inc.
Pegasus Components GmbH
A&K Electronics
Connector Distribution Corp
Right Parts Inc.
Holdelec - ElecDif-Pro
Resion
Elcom Components
Euro-Tech
ACDS - Activité Composants Distribution Service
Microfarads
Ashlea Components Ltd
Semi Source
Sinequanon
Sea View Technologies
LittleDiode
IBS Electronics
$0.302
$0.288
Corohmni
$0.445
Advanced Electronics
$0.458
$0.435
Modulus Dynamics
$0.494
$0.489
$0.474
Semicontronic
$0.731
$0.728
Ampacity Inc.
Corphita
$0.792
Continental Prestige Electronics
$0.880
$0.538
$0.327
$0.301
Argo Parts USA
$1.906
IDEA Electronic Components Group
$2.128
$1.915
DigiPath Technology Company
$4.001
MKK Technologies
ChromeModa Solutions
$4.231
$3.469
Perfect Parts
Allen Electronics Distributors
$0.678
$0.644
Authorized Procurement Solutions
A-Z Elektronik GmbH
Glotronic Ltd.
Alle Elektronik GmbH
Parana Technologies
$2.544
SupplyDigital Components
GreenTree Electronics
Eastek
Netroflash
$1.911
$1.853
$1.814
Component Stockers USA
$0.200
$0.140
TANS Electronics
Microchip USA
Problanco Electronics
Assy Fe
Futuretech Components
ChipTracer
Kulean Microsystems
UHIMA Technologies
Technoshack Inc. (Excess)
Formix International (Excess)
Kepictronics
Infinite Electronics LLP (Excess)
Giza Technologies, Inc.
UNI Independent Distributors
Cyclops Electronics Ltd (Excess)
Robosynatics
$10.016
Lucentia Tech
Operational Amplifiers (Op Amps) LM324AD attributes and parameters. Explore more Operational Amplifiers (Op Amps) devices from Samsung
Amplifier Type:
Architecture:
Technology:
Power Supply:
Total Functions:
Sub-Category:
Frequency Compensation:
Low-Offset:
Micropower:
Input Offset Voltage Limit:
Minimum Voltage Gain:
Maximum Bias Current (IIB) @25 °C:
Maximum Supply Voltage:
Lowest Operating Temperature:
Maximum Operating Temperature:
Maximum Supply Current:
Total Terminals:
Terminal Pitch:
Terminal Position:
Terminal Form:
Terminal Finish:
Package Body Material:
Surface Mount:
Temperature Grade:
Qualified:
JESD-30 Code:
JESD-609 Code:
Package Code:
Package Shape:
Package Style:
Package Equivalence Code:
LM324AD Amplifiers trade compliance attributes, and parameters.
ECCN
EAR99
ECCN Governance
EAR
HTS
8542.33.00.01
SB
8542.33.00.00
NSN
5962-01-238-5501, 5962012385501, 5962-01-518-3404, 5962015183404
NIIN
012385501, 015183404
PCN Obsolescence/ EOL - MEMS and Sensors 27/Aug/2013
PCN Design/Specification - New Material Set for SO8 & SO14 Pkg 18/Nov/2015
Samsung Electronics Co., Ltd. engages in the consumer electronics, information technology and mobile communications, and device solutions businesses worldwide. The company offers smartphones, tablets, watches, and accessories; TVs, projectors, and sound devices; home appliances, including refrigerators, washing machines and dryers, vacuum cleaners, cooking appliances, dishwashers, air conditioners, and air purifiers; monitors, and memory and storage products; displays, and smart and LED signages; and other accessories. It also engages in technology, venture capital investments, cloud services, network devices installation and optimization, semiconductor equipment services, digital advertising platforms, marketing, consulting, connected services, logistics, financing, and software design activities; toll processing of display panels and semiconductors; development and sale of network solutions; manufactures semiconductors and food; provision of repair services for electronic devices and enterprise automation solutions; and development and supply of semiconductor process defect and quality control software. The company serves various industries, including education, retail, and finance, as well as government and corporate customers. Samsung Electronics Co., Ltd. was incorporated in 1969 and is based in Suwon-si, South Korea.
2N7002
Diotec Semiconductor Ag
N-CHANNEL; Configuration: SINGLE WITH BUILT-IN DIODE; Surface Mount: YES; Maximum Power Dissipation (Abs): .35 W; Maximum Time At Peak Reflow Temperature (s): 10; Terminal Finish: MATTE TIN;
BSS138
Jiangsu Changjiang Electronics Technology
N-CHANNEL; Configuration: SINGLE WITH BUILT-IN DIODE; Surface Mount: YES; Package Style (Meter): SMALL OUTLINE; Maximum Drain Current (ID): .22 A; Package Shape: RECTANGULAR;
BAV99
Transys Electronics
RECTIFIER DIODE; Terminal Position: DUAL; Terminal Form: GULL WING; No. of Terminals: 3; Surface Mount: YES; Package Shape: RECTANGULAR;
M39029/58-360
Conesys
CONNECTOR ACCESSORY; MIL Conformity: YES; Mating Contacts: M39029/57-354; Terminal Type: CRIMP; DIN Conformity: NO; MIL-Connector Accessory Name: CONTACT;
LM358MX
ROHM
OPERATIONAL AMPLIFIER; Temperature Grade: COMMERCIAL; Terminal Form: GULL WING; No. of Terminals: 8; Package Code: LSOP; Package Shape: RECTANGULAR;
SMBJ18CA
Zowie Technology
TRANS VOLTAGE SUPPRESSOR DIODE; Terminal Position: DUAL; Terminal Form: C BEND; No. of Terminals: 2; Surface Mount: YES; Package Shape: RECTANGULAR;
LL4148
Sinyork
RECTIFIER DIODE; Surface Mount: YES; Config: SINGLE; No. of Phases: 1; No. of Elements: 1; Maximum Repetitive Peak Reverse Voltage: 100 V;
NC7WZ07P6X
Onsemi
The Onsemi NC7WZ07P6X is a logic gate with 2 functions, featuring a propagation delay of 4.8 ns at 1.8V supply voltage. With open-drain output characteristics, it operates in industrial temperatures from -40 to 85°C. Ideal for applications requiring fast signal processing and low power consumption in compact designs.
1N4148
Comchip Technology
RECTIFIER DIODE; Terminal Position: AXIAL; Terminal Form: WIRE; No. of Terminals: 2; Surface Mount: NO; Package Shape: ROUND;
2N7002,215
NXP Semiconductors
2N7002,215 by NXP Semiconductors is a small signal N-CHANNEL FET with a min DS breakdown voltage of 60V and max drain current of 0.3A. It is used for switching applications in enhancement mode, operates b/w -65 to 150 °C, and has a max power dissipation of 0.2W.
LM317T
Sgs-ates Componenti Electronici S P A
Other Regulators; No. of Terminals: 3; JESD-609 Code: e0; Terminal Position: SINGLE; Adjustability: ADJUSTABLE; Maximum Load Regulation (%): 1.5 %;
SS14
Hitano Enterprise
RECTIFIER DIODE; Terminal Position: DUAL; Terminal Form: C BEND; No. of Terminals: 2; Surface Mount: YES; Package Shape: RECTANGULAR;
Frontier Electronics
International Components
RECTIFIER DIODE; Surface Mount: NO; No. of Elements: 1; Terminal Finish: Tin/Lead (Sn/Pb); JESD-609 Code: e0; Maximum Reverse Recovery Time: .004 us;
Lite-on Technology
RECTIFIER DIODE; Surface Mount: YES; Terminal Finish: Tin/Lead (Sn/Pb); Maximum Operating Temperature: 175 Cel; Maximum Output Current: .1 A; Maximum Reverse Recovery Time: .006 us;
350766-1
TE Connectivity
TE Connectivity 350766-1 is a rectangular power connector with 0.25" mating contact pitch, rated for 600V and operating temperatures from -55 to 105°C. It has a durable design with POLYAMIDE insulator material, suitable for commercial applications requiring secure crimp termination in cable mounting setups.
N-CHANNEL; Configuration: SINGLE; Surface Mount: YES; Maximum Power Dissipation (Abs): .2 W; Maximum Operating Temperature: 150 Cel; Operating Mode: ENHANCEMENT MODE;
Vishay Telefunken
RECTIFIER DIODE; Terminal Position: END; Terminal Form: WRAP AROUND; No. of Terminals: 2; Surface Mount: YES; Package Shape: ROUND;
DS18B20Z
Dallas Semiconductor
TEMPERATURE SENSOR,SWITCH/DIGITAL OUTPUT,SERIAL; Mounting Feature: SURFACE MOUNT; No. of Terminals: 8; Package Shape or Style: RECTANGULAR; Housing: PLASTIC; Maximum Accuracy (Cel): 0.50;
M39029/58360
Esterline Technologies
CONNECTOR ACCESSORY; Terminal Type: CRIMP; Removal Tools: M81969/14-01; Associated Military - Specifications: MIL-DTL-38999; IEC Conformity: NO; MIL-Connector Accessory Name: CONTACT;
LT1013DIDR
Texas Instruments
LT1013DIDR by Texas Instruments is a dual operational amplifier with 1000uV max input offset voltage, -0.038uA max average bias current, and 114dB nominal CMRR. Ideal for industrial applications requiring high precision and low power consumption in a compact package.
MCP6001T-I/OT
Microchip Technology
MCP6001T-I/OT by Microchip Technology is a CMOS Operational Amplifier with 4500uV Max Input Offset Voltage, 76dB Nominal CMRR, and 1000kHz Unity Gain Bandwidth. Ideal for industrial applications requiring low-bias amplification in compact designs due to its small outline package and micropower consumption of 0.17mA at 5V supply voltage.
OPA2365AID
Texas Instruments OPA2365AID is an Operational Amplifier with 200uV Max Input Offset Voltage, 120dB Nominal CMRR, and 50000kHz Unity Gain Bandwidth. Ideal for automotive applications due to its low-offset, low-bias, and high CMRR features.
INA132U/2K5
Texas Instruments' INA132U/2K5 is an operational amplifier with 250uV max input offset voltage and 90dB nominal CMRR. Ideal for applications requiring a small outline package, it operates b/w -40 to 85°C with a supply voltage of ±15V. The op amp features low-offset, VFB architecture, and consumes only 0.185mA max supply current.
INA169NA/250G4
INA169NA/250G4 by Texas Instruments is a micropower instrumentation amplifier with 1000uV max input offset voltage, 10uA max average bias current, and 120dB nominal CMRR. Ideal for automotive applications due to its low profile design, wide operating temperature range (-40 to 125 °C), and high common mode voltage limit of 60V.
LM324DTBR2G
LM324DTBR2G by Onsemi is a quad operational amplifier with 4 functions. It has a max input offset voltage of 7000 uV and a nominal voltage of 5V, suitable for applications requiring high common mode rejection ratio. With low bias current and micropower technology, it is ideal for precision signal processing in commercial-grade temperature environments.
JM38510/13503BGA
Precision Monolithics
OPERATIONAL AMPLIFIER; Temperature Grade: MILITARY; Terminal Form: WIRE; No. of Terminals: 8; Package Shape: ROUND; Maximum Supply Voltage Limit: 22 V;
LM358AN
National Semiconductor
OPERATIONAL AMPLIFIER; Temperature Grade: COMMERCIAL; Terminal Form: THROUGH-HOLE; No. of Terminals: 8; Package Code: DIP; Package Shape: RECTANGULAR;
INA132UAE4
Texas Instruments' INA132UAE4 is an operational amplifier with 250uV max input offset voltage and 90dB nominal CMRR. Ideal for applications requiring a small outline package, it operates b/w -40 to 85°C with a supply voltage of ±15V. With low-offset and VFB architecture, it suits precision signal conditioning needs.
LM324N
Philips Semiconductors
OPERATIONAL AMPLIFIER; Temperature Grade: COMMERCIAL; Terminal Form: THROUGH-HOLE; No. of Terminals: 14; Package Code: DIP; Package Shape: RECTANGULAR;
LM7321MFX/NOPB
LM7321MFX/NOPB by Texas Instruments is a 5-terminal Op Amp with 6000uV Max Input Offset Voltage, 1.5uA Max Average Bias Current, and 80dB Nominal CMRR. Ideal for automotive applications due to its -40 to 125 °C operating temp range and VFB architecture for precision amplification in compact designs.
LM358D-T
LM358D-T by NXP Semiconductors is a dual operational amplifier with 70dB CMRR, 1000kHz unity gain bandwidth, and 9000uV max input offset voltage. Widely used in commercial applications due to its small outline package and low bias current of 0.5uA.
OPA376AIDCKR
OPA376AIDCKR by Texas Instruments is a CMOS Operational Amplifier with low-offset and low-bias features. It has a max input offset voltage of 25uV, nominal voltage of 2.2V, and unity gain bandwidth of 5.5MHz. Ideal for automotive applications due to its compact size, high common mode rejection ratio, and low power consumption at 0.95mA max supply current.
LM324M/NOPB
Rochester Electronics
OPA2320AIDGKR
OPA2320AIDGKR by Texas Instruments is a CMOS operational amplifier with low-offset and low-bias features. It has a max input offset voltage of 150 uV, nominal voltage of 5V, and nominal unity gain bandwidth of 20 MHz. Ideal for automotive applications due to its temperature grade and small outline package style.
LM324N/NOPB
LM324N/NOPB by Texas Instruments is a quad operational amplifier with 14 terminals. It features a max input offset voltage of 9000 uV, bias current of 0.5 uA, and common mode reject ratio of 85 dB. Widely used in applications requiring micropower amplification with a supply voltage range of 5-30 V.
AD8675ARZ-REEL
Analog Devices
AD8675ARZ-REEL by Analog Devices is an Operational Amplifier with 240uV Max Input Offset Voltage, 130dB CMRR, and 10000kHz Unity Gain Bandwidth. Ideal for automotive applications due to its low-offset and wide temperature range capabilities.
OPA2210IDRGR
OPA2210IDRGR by Texas Instruments is an operational amplifier with a max input offset voltage of 35uV and low bias current of 0.002uA. It operates at temperatures ranging from -40 to 125 °C, making it suitable for automotive applications. With a nominal unity gain bandwidth of 18,000 kHz, this op amp offers high performance in a compact package.
OPA2132UA/2K5
Burr-Brown Corporation
OPERATIONAL AMPLIFIER; Temperature Grade: INDUSTRIAL; Terminal Form: GULL WING; No. of Terminals: 8; Package Code: SOP; Package Shape: RECTANGULAR;
OPA4170AIPWR
OPA4170AIPWR by Texas Instruments is a micropower operational amplifier with low-bias current and high common mode rejection ratio. It operates at a wide temperature range of -40 to 125°C, making it suitable for automotive applications. With a unity gain bandwidth of 1200 kHz and compact dimensions, this op amp is ideal for precision signal conditioning in space-constrained environments.
Partstack™ will investigate all reported instances of potential suspect/counterfeit part listings.
Rca Solid State
Silicon Group
LM324N by Texas Instruments is a 4-function Op Amp with 14 terminals. It features a max input offset voltage of 9000 uV, bias current of 0.5 uA, and common mode reject ratio of 80 dB. Widely used in commercial applications for its low-bias, micropower design and voltage-feedback architecture.
Raytheon Semiconductor
OPERATIONAL AMPLIFIER; Temperature Grade: OTHER; Terminal Form: THROUGH-HOLE; No. of Terminals: 14; Package Code: DIP; Package Shape: RECTANGULAR;
Motorola
Fairchild Semiconductor
Samsung
Advanced Micro Devices
Harris Semiconductor
Intersil
STMicroelectronics
LM324AN
OPERATIONAL AMPLIFIER; Temperature Grade: MILITARY; Terminal Form: THROUGH-HOLE; No. of Terminals: 14; Package Code: DIP; Package Shape: RECTANGULAR;
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