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74HC257; 74HCT257

Quad 2-input multiplexer; 3-state

The 74HC257; 74HCT257 is a quad 2-input multiplexer with 3-state outputs. Inputs include clamp diodes. This enables the use of current limiting resistors to interface inputs to voltages in excess of VCC.

特性

  • Wide supply voltage range from 2.0 V to 6.0 V

  • CMOS low power dissipation

  • High noise immunity

  • Latch-up performance exceeds 100 mA per JESD 78 Class II Level B

  • Complies with JEDEC standards:

    • JESD8C (2.7 V to 3.6 V)
    • JESD7A (2.0 V to 6.0 V)

  • Non-inverting data path

  • 3-state outputs interface directly with system bus

  • Input levels:

    • For 74HC257: CMOS level

    • For 74HCT257: TTL level

  • ESD protection:

    • HBM: ANSI/ESDA/JEDEC JS-001 class 2 exceeds 2000 V

    • CDM: ANSI/ESDA/JEDEC JS-002 class C3 exceeds 1000 V

  • Specified from -40 °C to +85 °C and from -40 °C to +125 °C

参数类型

Type numberProduct statusVCC (V)Logic switching levelsOutput drive capability (mA)tpd (ns)Power dissipation considerationsTamb (°C)Rth(j-a) (K/W)Ψth(j-top) (K/W)Rth(j-c) (K/W)Package name
74HC257DProduction2.0 - 6.0CMOS± 7.811low-40~125929.652SO16
74HC257PWProduction2.0 - 6.0CMOS± 7.811low-40~1251254.554.6TSSOP16
74HCT257DProduction4.5 - 5.5TTL± 613low-40~125929.652SO16
74HCT257PWProduction4.5 - 5.5TTL± 613low-40~1251254.554.6TSSOP16

封装

型号封装尺寸版本回流焊/波峰焊包装状态标示可订购的器件编号，（订购码(12NC)）
74HC257D
SO16
(SOT109-1) 		SOT109-1SO-SOJ-REFLOW
SO-SOJ-WAVE
SOT109-1_653Active74HC257D74HC257D,653
( 9337 136 40653 )
74HC257PW
TSSOP16
(SOT403-1) 		SOT403-1SSOP-TSSOP-VSO-WAVE
SOT403-1_118ActiveHC25774HC257PW,118
( 9351 746 80118 )
74HCT257D
SO16
(SOT109-1) 		SOT109-1SO-SOJ-REFLOW
SO-SOJ-WAVE
SOT109-1_653Active74HCT257D74HCT257D,653
( 9337 136 50653 )
74HCT257PW
TSSOP16
(SOT403-1) 		SOT403-1SSOP-TSSOP-VSO-WAVE
SOT403-1_118ActiveHCT25774HCT257PW,118
( 9351 884 00118 )

下表中的版本已停产。参见表 停产信息 了解更多信息。

型号封装尺寸版本回流焊/波峰焊包装状态标示可订购的器件编号，（订购码(12NC)）
74HC257D
SO16
(SOT109-1) 		SOT109-1SO-SOJ-REFLOW
SO-SOJ-WAVE
SOT109-1_652Withdrawn / End-of-life74HC257D74HC257D,652
( 9337 136 40652 )
74HCT257D
SO16
(SOT109-1) 		SOT109-1SO-SOJ-REFLOW
SO-SOJ-WAVE
SOT109-1_652Withdrawn / End-of-life74HCT257D74HCT257D,652
( 9337 136 50652 )

停产信息

型号可订购的器件编号，（订购码(12NC)）最后一次购买日期最后一次交货日期替代产品状态备注
74HC257D9337136406522021-12-312022-06-3074HC257D
    74HC257PW9351746801122018-12-312019-06-3074HC257PW
      74HCT257D9337136506522021-12-312022-06-3074HCT257D
        74HCT257D/AU935301266118
        74HCT257PW9351884001122018-12-312019-06-3074HCT257PW

          环境信息

          型号可订购的器件编号化学成分RoHSRHF指示符无铅转换日期
          74HC257D74HC257D,65374HC257Dweek 12, 2005
          74HC257PW74HC257PW,11874HC257PWweek 10, 2005
          74HCT257D74HCT257D,65374HCT257Dweek 35, 2004
          74HCT257PW74HCT257PW,11874HCT257PWweek 10, 2005

          下表中的版本已停产。参见表 停产信息 了解更多信息。

          型号可订购的器件编号化学成分RoHSRHF指示符无铅转换日期
          74HC257D74HC257D,65274HC257Dweek 12, 2005
          74HCT257D74HCT257D,65274HCT257Dweek 35, 2004
          品质及可靠性免责声明

          文档 (9)

          文件名称标题类型日期
          74HC_HCT257Quad 2-input multiplexer; 3-stateData sheet2024-03-22
          AN11044Pin FMEA 74HC/74HCT familyApplication note2019-01-09
          HCT_USER_GUIDEHC/T User GuideUser manual1997-10-31
          SO-SOJ-WAVEFootprint for wave solderingWave soldering2009-10-08
          SO-SOJ-REFLOWFootprint for reflow solderingReflow soldering2009-10-08
          WAVE_BG-BD-1Wave soldering profileWave soldering2021-09-08
          SOT109-1plastic, small outline package; 16 leads; 1.27 mm pitch; 9.9 mm x 3.9 mm x 1.75 mm bodyPackage information2023-11-07
          SOT403-1plastic, thin shrink small outline package; 16 leads; 5 mm x 4.4 mm x 1.2 mm bodyPackage information2023-11-08
          SSOP-TSSOP-VSO-WAVEFootprint for wave solderingWave soldering2009-10-08

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