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 | 制造商 | 封装 | Pin2PIN | 参数 |
|---|---|---|---|---|
| EM74HCT240D | ENERGYMATH | SOP-20L | 74HCT240D, SN74HCT240DW, RS240TXS20 | Octal buffer/line driver; 3-state; inverting; TTL-enabled |
| EM74HCT21PW | ENERGYMATH | TSSOP14L | CD74HCT21PW, | Dual 4-input AND gate; TTL input |
| EM74HCT21D | ENERGYMATH | SOP-14L | CD74HCT21D, | Dual 4-input AND gate; TTL input |
| EM74HCT20PW | ENERGYMATH | TSSOP14L | 74HCT20PW, CD74HCT20PW, | Dual 4-input NAND gate; TTL input |
| EM74HCT20D | ENERGYMATH | SOP-14L | 74HCT20D, CD74HCT20D, | Dual 4-input NAND gate; TTL input |
| EM74HCT166PW | ENERGYMATH | TSSOP16L | 74HCT166PW, SN74HCT166PW, | 8-bit parallel-in/serial out shift register; TTL-enabled |
| EM74HCT166D | ENERGYMATH | SOP-16L | 74HCT166D, SN74HCT166D, | 8-bit parallel-in/serial out shift register; TTL-enabled |
| EM74HCT165PW | ENERGYMATH | TSSOP16L | 74HCT165PW, SN74HCT165PW, | 8-bit parallel-in/serial out shift register; TTL-enabled |
| EM74HCT165D | ENERGYMATH | SOP-16L | 74HCT165D, SN74HCT165D, | 8-bit parallel-in/serial out shift register; TTL-enabled |
| EM74HCT164PW | ENERGYMATH | TSSOP14L | 74HCT164PW, SN74HCT164PW, | 8-bit serial-in, parallel-out shift register; TTL-enabled |
| EM74HCT164D | ENERGYMATH | SOP-14L | 74HCT164D, SN74HCT164D, | 8-bit serial-in, parallel-out shift register; TTL-enabled |
| EM74HCT14PW | ENERGYMATH | TSSOP14L | 74HCT14PW, SN74HCT14PW, RS6GT14XQ | Hex inverting Schmitt trigger; TTL input |
| EM74HCT14D | ENERGYMATH | SOP-14L | 74HCT14D, SN74HCT14D, RS6GT14XP | Hex inverting Schmitt trigger; TTL input |
| EM74HCT132PW | ENERGYMATH | TSSOP14L | 74HCT132PW, SN74HCT132PW, | Quad 2-input NAND Schmitt trigger; TTL input |
| EM74HCT132D | ENERGYMATH | SOP-14L | 74HCT132D, SN74HCT132D, | Quad 2-input NAND Schmitt trigger; TTL input |
| EM74HCT126PW | ENERGYMATH | TSSOP14L | 74HCT126PW, SN74HCT126PW, RS4GT126XQ | Quad buffer/line driver; 3-state; TTL input |
| EM74HCT126D | ENERGYMATH | SOP-14L | 74HCT126D, SN74HCT126D, RS4GT126XP | Quad buffer/line driver; 3-state; TTL input |
| EM74HCT125PW | ENERGYMATH | TSSOP14L | 74HCT125PW, SN74HCT125PW, RS4GT125XQ | Quad buffer/line driver; 3-state; TTL input |
| EM74HCT125D | ENERGYMATH | SOP-14L | 74HCT125D, SN74HCT125D, RS4GT125XP | Quad buffer/line driver; 3-state; TTL input |
| EM74HCT11PW | ENERGYMATH | TSSOP14L | 74HCT11PW, SN74HCT11PW, | Triple 3-input AND gate; TTL input |