Logic IC (Logic Integrated Circuit) 内部由海量的晶体管组成精密的“电子开关网络”。这些开关根据预设的规则（真值表）导通或闭合，接收到输入的电平信号后，立刻输出对应的结果，以此实现加法、比较、判断等功能。逻辑芯片是半导体产业中市场规模最大的一类，2025年全球销售额已达到3019亿美元。
| 型号 | 品牌 | Pin2PIN | 参数 | 封装 |
|---|---|---|---|---|
| EM74LVC540APW | ENERGYMATH | 74LVC540APW, SN74LVC540APW, RS540XS20 | Octal Buffers/Drivers with 3-State Outputs | TSSOP-20L |
| EM74LVC541AD | ENERGYMATH | 74LVC541AD, SN74LVC541ADW, RS541XTSS20-G | Octal buffer/line driver with 5 V tolerant inputs/outputs; 3-state | SOP-20L |
| EM74LVC541APW | ENERGYMATH | 74LVC541APW, SN74LVC541APW, RS541XS20 | Octal buffer/line driver with 5 V tolerant inputs/outputs; 3-state | TSSOP-20L |
| EM74AHC240D | ENERGYMATH | 74AHC240D, SN74AHC240DW, | Octal buffer/line driver; 3-state; inverting | SOP-20L |
| EM74AHC240PW | ENERGYMATH | 74AHC240PW, SN74AHC240PW, | Octal buffer/line driver; 3-state; inverting | TSSOP-20L |
| EM74AHCT240D | ENERGYMATH | 74AHCT240D, SN74AHCT240DW, | Octal buffer/line driver; 3-state; inverting; TTL-enabled | SOP-20L |
| EM74AHCT240PW | ENERGYMATH | 74AHCT240PW, SN74AHCT240PW, | Octal buffer/line driver; 3-state; inverting; TTL-enabled | TSSOP-20L |
| EM74AHC244D | ENERGYMATH | 74AHC244D, SN74AHC244DW, RS244YS20 | Octal buffer/line driver; 3-state | SOP-20L |
| EM74AHC244PW | ENERGYMATH | 74AHC244PW, SN74AHC244PW, RS244YTSS20 | Octal buffer/line driver; 3-state | TSSOP-20L |
| EM74AHCT244D | ENERGYMATH | 74AHCT244D, SN74AHCT244DW, RS244TXS20 | Octal buffer/line driver; 3-state; TTL-enabled | SOP-20L |
| EM74AHCT244PW | ENERGYMATH | 74AHCT244PW, SN74AHCT244PW, RS244TXTSS20 | Octal buffer/line driver; 3-state; TTL-enabled | TSSOP-20L |
| EM74AHC245D | ENERGYMATH | 74AHC245D, SN74AHC245DW, RS245YS20 | Octal bus transceiver; 3-state | SOP-20L |
| EM74AHC245PW | ENERGYMATH | 74AHC245PW, SN74AHC245PW, RS245YTSS20 | Octal bus transceiver; 3-state | TSSOP-20L |
| EM74AHCT245D | ENERGYMATH | 74AHCT245D, SN74AHCT245DW, RS245TXS20 | Octal bus transceiver; 3-state; TTL-enabled | SOP-20L |
| EM74AHCT245PW | ENERGYMATH | 74AHCT245PW, SN74AHCT245PW, RS245TXTSS20 | Octal bus transceiver; 3-state; TTL-enabled | TSSOP-20L |
| EM74AHC540D | ENERGYMATH | 74AHC540D, SN74AHC540DW, RS540XS20 | Octal buffer/line driver; 3-state; inverting | SOP-20L |
| EM74AHC540PW | ENERGYMATH | 74AHC540PW, SN74AHC540PW, RS540XTSS20-G | Octal buffer/line driver; 3-state; inverting | TSSOP-20L |
| EM74AHCT540D | ENERGYMATH | 74AHCT540D, SN74AHCT540DW, RS540TXS20 | Octal buffer/line driver; 3-state; inverting; TTL-enabled | SOP-20L |
| EM74AHCT540PW | ENERGYMATH | 74AHCT540PW, SN74AHCT540PW, RS540TXTSS20-G | Octal buffer/line driver; 3-state; inverting; TTL-enabled | TSSOP-20L |
| EM74AHC541D | ENERGYMATH | 74AHC541D, SN74AHC541DW, | Octal buffer/line driver; 3-state | SOP-20L |