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
MM70-314-310B1-2-R300 by Japan Aviation Electronics features a mating contact pitch of 0.02", insulation resistance of 50M ohm, and dielectric voltage of 350VAC. Ideal for edge mounting, this card edge connector has a total of 310 contacts and operates b/w -40 to 85°C, meeting UL standards for commercial reliability.
Median Price
$7.611
Lifecycle Status
Suppliers In-Stock
9
In-Stock Inventory
1k+
Heilind Electronics
1+ parts
100+ parts
-
1k+ parts
10k+ parts
Nova Conductors
$759.454
Rebound Electronics
Vyrian
Rutronik
$5.210
$4.770
Chip Stock
LIBRA Elektronik GmbH
Semi Source
Bristol Electronics
Aztec Data Supply Inc.
$3.751
Advanced Electronics
$4.229
$4.018
Corohmni
$7.653
AZTECH Wire
$8.142
Continental Prestige Electronics
$744.265
Argo Parts USA
$751.859
$736.670
Netroflash
Authorized Procurement Solutions
0.02 - Allows for high density connections, ideal for compact electronic devices.
3.539 inch - Provides ample space for connections, ensuring secure and stable attachment.
50000000 ohm - Ensures minimal signal interference and reliable performance.
0.264 inch - Slim design fits well in tight spaces, suitable for space-constrained applications.
350VAC - Offers protection against electrical breakdown, ensuring safety in operation.
GLASS FILLED LIQUID CRYSTAL POLYMER - Provides strong insulation properties and durability.
2 - Allows for multiple connections in a single component, reducing overall assembly time.
EDGE MOUNT - Facilitates easy installation and removal, convenient for maintenance purposes.
85 - Ensures reliable performance even in high-temperature environments.
40 °C - Suitable for use in a wide range of temperature conditions, versatile and adaptable.
12u - Enhances conductivity and corrosion resistance for long-lasting performance.
2 - Provides flexibility in connecting multiple circuit boards, enabling complex electronic systems.
CARD EDGE CONNECTOR - Offers secure and reliable connection, ideal for high-speed data transmission applications.
COPPER ALLOY - Ensures excellent conductivity and durability for reliable signal transmission.
AU ON NI - Provides a reliable connection with minimal signal loss and corrosion resistance.
0.5 A - Suitable for low-power signal transmission applications, ensuring efficient energy usage.
BLACK - Provides a sleek and professional appearance, suitable for a wide range of equipment designs.
UL - Meets industry standards for safety and performance, ensuring quality and reliability.
310 - Allows for extensive connectivity options, suitable for complex electronic systems.
ONE - Simplifies assembly and maintenance, reducing overall system complexity.
30 Cycles - Designed for repeated use, ensuring long-term reliability and performance.
BOARD - Securely attaches to PCBs, providing a stable connection for electronic components.
0.508 - Enables precise alignment and connection, ensuring accurate signal transmission.
RECTANGULAR - Provides a standardized layout for easy integration, suitable for mass production.
SURFACE MOUNT - Enables easy installation on PCBs, suitable for automated assembly processes.
55 mohm - Ensures minimal signal loss and efficient power transmission, optimizing performance.
RIGHT ANGLE - Facilitates space-saving installation, suitable for compact electronic devices.
LOCKING - Provides a secure and stable connection, reducing the risk of disconnection or signal loss.
RECTANGULAR - Allows for easy alignment and connection, ideal for high-volume production.
COMMERCIAL - Meets industry standards for reliability and performance, ensuring consistent quality.
Headers & Edge Type Connectors MM70-314-310B1-2-R300 attributes and parameters. Explore more Headers & Edge Type Connectors devices from Japan Aviation Electronics Industry
Board Mounting Option:
Body Width:
Body Length:
Connector Type:
Mating Contact Finish:
Contact Material:
Contact Pattern:
Contact Resistance:
Dielectric Withstanding Voltage (V):
Durability:
Insulation Resistance:
Insulator Color:
Insulator Material:
Manufacturer Series:
Mating Contact Pitch (inch):
Mounting Option-1:
Mounting Style:
Mounting Type:
No. of Connectors:
No. of PCB Rows:
No. of Rows Loaded:
Maximum Operating Temperature (Cel):
Minimum Operating Temperature:
PCB Contact Pattern:
Plating Thickness (inch):
Rated Current - Signal:
Reference Standard:
Reliability:
Sub-Category:
Terminal Pitch (mm):
Termination Type:
Total No. of Contacts:
MM70-314-310B1-2-R300 Connectors trade compliance attributes, and parameters.
ECCN
EAR99
ECCN Governance
EAR
HTS
8536.69.40.40
SB
PCN Assembly/Origin - MM70 Series Location 16/Sep/2022
PCN Packaging - Cover Tape Suppiler Change 14/Nov/2022
PCN Other - MM70 - replacement release 06/OCT/2020
Since our establishment in 1953, we at JAE, under the corporate philosophy of "Explore, Create and Practice", have successfully developed and globally expanded our three core business areas of connectors, user interface related devices, and aviation electronics supported by our outstanding development capability in innovative and creative technologies.
2N2222A
Digitron Semiconductors
NPN; Configuration: SINGLE; Surface Mount: NO; Nominal Transition Frequency (fT): 300 MHz; Maximum Power Dissipation (Abs): .5 W; Maximum Collector Current (IC): .8 A;
SS14
Vishay Intertechnology
Vishay Intertechnology's SS14 is a Schottky rectifier diode with a max forward voltage of 0.5V and output current of 1A. Operating at up to 125°C, it has a repetitive peak reverse voltage of 40V. Ideal for surface mount applications, it suits various electronic circuits requiring efficient rectification and low forward voltage drop.
BAV99
Eic Semiconductor
RECTIFIER DIODE; Terminal Position: DUAL; Terminal Form: GULL WING; No. of Terminals: 3; Surface Mount: YES; Package Shape: RECTANGULAR;
M24308/2-1F
Defense Logistics Agency
D SUBMINIATURE CONNECTOR; Option: GENERAL PURPOSE; Contact Gender: FEMALE; Mounting Type: CABLE AND PANEL; Mating Info.: MULTIPLE MATING PARTS AVAILABLE; Empty Shell: NO;
DP83848IVVX/NOPB
National Semiconductor
ETHERNET TRANSCEIVER; Temperature Grade: INDUSTRIAL; Terminal Form: GULL WING; No. of Terminals: 48; Package Code: QFP; Package Shape: SQUARE;
1N4148
Hitano Enterprise
RECTIFIER DIODE; Terminal Position: AXIAL; Terminal Form: WIRE; No. of Terminals: 2; Surface Mount: NO; Package Shape: ROUND;
2N7002
Inter F E T
N-CHANNEL; Configuration: SINGLE WITH BUILT-IN DIODE; Surface Mount: YES; Maximum Power Dissipation (Abs): .2 W; Maximum Drain-Source On Resistance: 7.5 ohm; Maximum Drain Current (Abs) (ID): .115 A;
BSS138W-7-F
Multicomp Pro
N-CHANNEL; Configuration: SINGLE WITH BUILT-IN DIODE; Surface Mount: YES; Maximum Power Dissipation (Abs): .2 W; Transistor Element Material: SILICON; No. of Elements: 1;
LM555CM
PULSE; RECTANGULAR; Temperature Grade: COMMERCIAL; No. of Terminals: 8; Package Code: SOP; Package Shape: RECTANGULAR; Surface Mount: YES;
LM2931AZ-5.0RAG
Onsemi
LM2931AZ-5.0RAG by Onsemi is a Fixed Positive Single Output LDO Regulator with 5V nominal output voltage, 0.1A max output current, and 0.6V max dropout voltage. Ideal for applications requiring stable voltage regulation in temperature-sensitive environments up to 150°C.
Continental Device India
NPN; Configuration: SINGLE; Surface Mount: NO; Nominal Transition Frequency (fT): 250 MHz; Maximum Power Dissipation (Abs): .5 W; Maximum Collector Current (IC): .8 A;
M39029/56-351
Itt Cannon
CONNECTOR ACCESSORY; MIL Conformity: YES; Terminal Type: WIRE; IEC Conformity: NO; Alternate Contact Sources: ITT CANNON; Associated Military - Specifications: MIL-C-38999;
LL4148
Panjit International
RECTIFIER DIODE; Terminal Position: END; Terminal Form: WRAP AROUND; No. of Terminals: 2; Surface Mount: YES; Package Shape: ROUND;
LM2931Z-5.0RPG
LM2931Z-5.0RPG by Onsemi is a Fixed Positive Single Output LDO Regulator with 5V Nominal Output Voltage, 0.1A Max Output Current, and 6V Min Input Voltage. It operates in temperatures ranging from -40 to 125 °C and is ideal for applications requiring stable voltage regulation in electronic circuits.
Grande Electronics
1N4148WS
RECTIFIER DIODE; Terminal Position: DUAL; Terminal Form: GULL WING; No. of Terminals: 2; Surface Mount: YES; Package Shape: RECTANGULAR;
LM358N
Fairchild Semiconductor
OPERATIONAL AMPLIFIER; Temperature Grade: COMMERCIAL; Terminal Form: THROUGH-HOLE; No. of Terminals: 8; Package Code: DIP; Package Shape: RECTANGULAR;
EEAGA1H4R7
Panasonic
Panasonic EEAGA1H4R7 is a 4.7uF, 50V Aluminum Electrolytic Capacitor with 0.1 Tan Delta and 0.003mA Leakage Current. Ideal for applications requiring high ripple current handling in temperatures ranging from -55 to 105°C.
Rectron
N-CHANNEL; Configuration: SINGLE WITH BUILT-IN DIODE; Surface Mount: YES; Operating Mode: ENHANCEMENT MODE; Maximum Operating Temperature: 150 Cel; Terminal Form: GULL WING;
LL4148-GS08
Telefunken Microelectronics
RECTIFIER DIODE; Surface Mount: YES; JESD-609 Code: e0; No. of Elements: 1; Maximum Operating Temperature: 175 Cel; Maximum Non Repetitive Peak Forward Current: 2 A;
B2B-PH-K-S-GW
J S T Mfg
B2B-PH-K-S-GW by J S T Mfg is a BOARD CONNECTOR with 2 contacts, BRASS material, and Tin (Sn) finish. It has a terminal pitch of 2mm and is ideal for applications requiring male contact gender in straight mounting style on boards.
801-43-020-10-012000
Mill-max Mfg
Mill-max Mfg's 801-43-020-10-012000 is a 20-contact board connector with matte tin over nickel finish. Featuring a terminal pitch of 2.54mm, it is ideal for applications requiring a female socket connector with UL94V-0 flammability rating. Suitable for straight mounting on boards, this connector offers reliable solder termination.
ASP-134488-01
Samtec
Samtec ASP-134488-01 is a 10-row, 400-contact board connector with 0.05" pitch and liquid crystal polymer insulator. It features gold over nickel mating contacts, straight mounting style, and surface mount termination. Ideal for commercial applications requiring high-density connections on PCBs.
20021121-00006C4LF
Amphenol Communications Solutions
Amphenol Communications Solutions' 20021121-00006C4LF is a board connector with 0.05" mating contact pitch, 100000000 ohm insulation resistance, and 700VAC dielectric voltage. Ideal for applications requiring a durable male connector with surface mount termination and black insulator color.
20021111-00010T4LF
The Amphenol Communications Solutions 20021111-00010T4LF is a board connector with 10 contacts, rated for 1A signal current. It features a mating contact pitch of 0.05", insulation resistance of 100M ohm, and operates b/w -40°C to 125°C. Ideal for commercial applications requiring durable connectors with high mating cycles.
306-022-520-102
Edac
Edac 306-022-520-102 is a 22-contact card edge connector with 0.156" pitch, rated at 5A power. With POLYETHYLENE POLYESTER insulator and UL94V-0 flammability, it operates b/w -40 to 105°C. Ideal for board mounting applications requiring high insulation resistance and dielectric voltage withstand capabilities.
DM3AT-SF-PEJM5
Hirose Electric
The Hirose Electric DM3AT-SF-PEJM5 is a card edge connector with 8 contacts, gold termination finish, and liquid crystal polymer insulator. It has a mating contact pitch of 0.043", withstands up to 500VAC, and operates b/w -25°C to 85°C. Ideal for board mounting applications in commercial settings with durability up to 10,000 cycles.
43025-0800
Molex
The Molex 43025-0800 is a board connector with 8 contacts, 2 rows, and a mating contact pitch of 0.118". It has a body length of 0.506", insulation resistance of 1Gohm, and operates b/w -40 to 105°C. Ideal for commercial applications requiring a reliable female connector with crimp termination and UL94V-0 flammability rating.
02021602201
Harting Electronics & Kg
02021602201 by Harting Electronics & Kg is a 5-row, 160-contact board Euro connector with gold over nickel termination. It features a mating contact pitch of 0.1", insulation resistance of 1TΩ, and withstands up to 1000VAC. Ideal for commercial applications requiring durable connectors with high reliability in temperatures ranging from -65°C to 125°C.
QSH-030-01-L-D-A-K-TR
QSH-030-01-L-D-A-K-TR by Samtec is a 60-contact, 2-row stacking connector with a mating contact pitch of 0.02". It features a liquid crystal polymer insulator, gold mating contact finish, and phosphor bronze contact material. Ideal for board-to-board applications requiring high durability and reliability in commercial settings.
TCMD-12-01
Samtec's TCMD-12-01 is a 24-contact, 2-row board connector with terminal pitch of 2mm. It supports IDC/solder termination and male contact gender. Ideal for applications requiring straight mounting on both boards and cables.
2-640456-3
Tyco Electronics Amp
BOARD CONNECTOR; Option: GENERAL PURPOSE; Contact Gender: MALE; Mating Info.: MULTIPLE MATING PARTS AVAILABLE; UL Flammability Code: 94V-0; Terminal Pitch (mm): 2.54;
DT06-6S-CE05
Deutsch
BOARD CONNECTOR; Reliability: COMMERCIAL; Contact Gender: FEMALE; Dielectric Withstanding Voltage (V): 1500VAC; No. of Connectors: ONE; Manufacturer Series: DT;
640456-5
BOARD CONNECTOR; Option: GENERAL PURPOSE; Contact Gender: MALE; DIN Conformance: NO; Contact Material: COPPER ALLOY; Terminal Pitch (mm): 2.54;
BM03B-GHS-TBT(LF)(SN)(N)
BM03B-GHS-TBT(LF)(SN)(N) by J S T Mfg is a 3-contact BOARD CONNECTOR with Tin (Sn) finish. Made of Phosphor Bronze, it has 1.25mm terminal pitch for SURFACE MOUNT application on boards. UL Flammability Code: 94V-0, ideal for various electronic devices.
FTSH-105-01-L-DV-K-A-TR
Samtec's FTSH-105-01-L-DV-K-A-TR is a 2-row, 10-contact board connector with a mating contact pitch of 0.05". Featuring gold over nickel finish, it has a rated signal current of 3.4A and operates b/w -55 to 125°C. Ideal for commercial applications requiring reliable surface mount connections on PCBs.
VHR-4N-M
BOARD CONNECTOR;
1658621-1
BOARD CONNECTOR; Option: GENERAL PURPOSE; Contact Gender: FEMALE; UL Flammability Code: 94V-0; Mating Contact Finish: GOLD (15) OVER NICKEL (50)/GOLD FLASH (15) OVER PALLADIUM NICKEL (15); Filter Feature: NO;
103948-9
TE Connectivity
TE Connectivity 103948-9 is a board connector with 10 contacts, 0.1" pitch, and 3A signal rating. It features POLYETHYLENE insulation, tin/lead finish, and operates b/w -65 to 105°C. Ideal for commercial applications requiring reliable male connectors with latching mounting options.
DF40C-80DP-0.4V(51)
DF40C-80DP-0.4V(51) by Hirose Electric is a 2-row, 80-contact board stacking connector with gold-plated phosphor bronze contacts. Featuring a mating contact pitch of 0.016", it offers high insulation resistance of 50M ohm and withstands up to 100VAC. Ideal for PCB applications requiring reliable signal transmission in commercial environments at temperatures ranging from -35°C to 85°C.
Partstack™ will investigate all reported instances of potential suspect/counterfeit part listings.
MM70-314B1-2-R300
Japan Aviation Electronics Industry
MM70-314B1-2-R300 by Japan Aviation Electronics features a mating contact pitch of 0.02", insulator made of glass-filled liquid crystal polymer, and total 314 contacts. It is a card edge connector with UL flammability code 94V-0, suitable for board mounting applications requiring right angle mounting style and surface mount termination type.
MM70-314-310B1-1-R300
MM70-314-310B1-1-R300 by Japan Aviation Electronics Industry is a CARD EDGE CONNECTOR with 310 contacts. It has a Mating Contact Pitch of 0.02 inch and an Insulation Resistance of 50M ohm. This connector is commonly used in board mounting applications for its durability and reliability.
MM70-314B2-1-R500
CARD EDGE CONNECTOR; Option: GENERAL PURPOSE; Contact Gender: FEMALE; No. of Connectors: ONE; Board Mounting Option: PEG; Mounting Type: BOARD;
MM70-314-310B2-2-R500
CARD EDGE CONNECTOR; Option: GENERAL PURPOSE; Contact Gender: FEMALE; DIN Conformance: NO; Filter Feature: NO; Mixed Contacts: NO;
MM70-314-310B2-1-R500
CARD EDGE CONNECTOR; Option: GENERAL PURPOSE; Contact Gender: FEMALE; Mounting Type: BOARD; Filter Feature: NO; Mating Contact Finish: NOT SPECIFIED;
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