特性
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Balanced propagation delays
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All inputs have Schmitt-trigger actions
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Non-inverting data path
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Wide supply voltage range from 2.0 V to 5.5 V
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Input levels:
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For 74AHC257: CMOS level
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For 74AHCT257: TTL level
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Overvoltage tolerant inputs to 5.5 V
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High noise immunity
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CMOS low power dissipation
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Latch-up performance exceeds 100 mA per JESD 78 Class II Level A
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ESD protection:
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HBM: ANSI/ESDA/JEDEC JS-001 class 2 exceeds 2000 V
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CDM: ANSI/ESDA/JEDEC JS-002 class C3 exceeds 1000 V
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Specified from -40 °C to +85 °C and from -40 °C to +125 °C
参数类型
| Type number | Product status | VCC (V) | Logic switching levels | Output drive capability (mA) | tpd (ns) | Power dissipation considerations | Tamb (°C) | Rth(j-a) (K/W) | Ψth(j-top) (K/W) | Rth(j-c) (K/W) | Package name |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 74AHC257D | Production | 2.0 - 5.5 | CMOS | ± 8 | 2.9 | low | -40~125 | 94 | 10.3 | 53 | SO16 |
| 74AHC257PW | Production | 2.0 - 5.5 | CMOS | ± 8 | 2.9 | low | -40~125 | 126 | 4.9 | 56.3 | TSSOP16 |
| 74AHCT257D | Production | 4.5 - 5.5 | TTL | ± 8 | 3.7 | low | -40~125 | 93 | 9.7 | 52 | SO16 |
| 74AHCT257PW | Production | 4.5 - 5.5 | TTL | ± 8 | 3.7 | low | -40~125 | 125 | 4.6 | 54.9 | TSSOP16 |
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)） |
|---|---|---|---|---|---|---|---|
| 74AHC257D |  SO16 (SOT109-1) | SOT109-1 | SO-SOJ-REFLOW SO-SOJ-WAVE | SOT109-1_118 | Active | 74AHC257D | 74AHC257D,118 ( 9352 654 67118 ) |
| 74AHC257PW |  TSSOP16 (SOT403-1) | SOT403-1 | SSOP-TSSOP-VSO-WAVE | SOT403-1_118 | Active | AHC257 | 74AHC257PW,118 ( 9352 654 68118 ) |
| 74AHCT257D | SO16 (SOT109-1) | SOT109-1 | SO-SOJ-REFLOW SO-SOJ-WAVE | SOT109-1_118 | Active | 74AHCT257D | 74AHCT257D,118 ( 9352 654 69118 ) |
| 74AHCT257PW | TSSOP16 (SOT403-1) | SOT403-1 | SSOP-TSSOP-VSO-WAVE | SOT403-1_118 | Active | AHCT257 | 74AHCT257PW,118 ( 9352 654 70118 ) |
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 |
|---|---|---|---|---|---|---|
| 74AHC257D | 935265467112 | 2021-12-31 | 2022-06-30 | 74AHC257D | ||
| 74AHC257PW | 935265468112 | 2021-12-31 | 2022-06-30 | 74AHC257PW | ||
| 74AHCT257D | 935265469112 | 2021-12-31 | 2022-06-30 | 74AHCT257D | ||
| 74AHCT257PW | 935265470112 | 2018-12-31 | 2019-06-30 | 74AHCT257PW |
环境信息
| 型号 | 可订购的器件编号 | 化学成分 | RoHS | RHF指示符 | 无铅转换日期 |
|---|---|---|---|---|---|
| 74AHC257D | 74AHC257D,118 | 74AHC257D |  |   | week 35, 2004 |
| 74AHC257PW | 74AHC257PW,118 | 74AHC257PW | | | week 10, 2005 |
| 74AHCT257D | 74AHCT257D,118 | 74AHCT257D | | | week 35, 2004 |
| 74AHCT257PW | 74AHCT257PW,118 | 74AHCT257PW | | | week 10, 2005 |
文档 (9)
| 文件名称 | 标题 | 类型 | 日期 |
|---|---|---|---|
| 74AHC_AHCT257 | Quad 2-input multiplexer; 3-state | Data sheet | 2024-03-07 |
| ahct257 | ahct257 IBIS model | IBIS model | 2013-04-07 |
| ahc257 | ahc257 IBIS model | IBIS model | 2013-04-07 |
| SO-SOJ-WAVE | Footprint for wave soldering | Wave soldering | 2009-10-08 |
| SO-SOJ-REFLOW | Footprint for reflow soldering | Reflow soldering | 2009-10-08 |
| WAVE_BG-BD-1 | Wave soldering profile | Wave soldering | 2021-09-08 |
| SOT109-1 | plastic, small outline package; 16 leads; 1.27 mm pitch; 9.9 mm x 3.9 mm x 1.75 mm body | Package information | 2023-11-07 |
| SOT403-1 | plastic, thin shrink small outline package; 16 leads; 5 mm x 4.4 mm x 1.2 mm body | Package information | 2023-11-08 |
| SSOP-TSSOP-VSO-WAVE | Footprint for wave soldering | Wave soldering | 2009-10-08 |
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