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 |
|---|---|---|---|---|
| EM74HC241PW | ENERGYMATH | TSSOP20L | 74HC241PW, SN74HC241PW, | Octal buffer/line driver; 3-state |
| EM74HC241D | ENERGYMATH | SOP-20L | 74HC241D, SN74HC241DW, | Octal buffer/line driver; 3-state |
| EM74HC240PW | ENERGYMATH | TSSOP20L | 74HC240PW, SN74HC240PW, | Octal buffer/line driver; 3-state; inverting |
| EM74HC240D | ENERGYMATH | SOP-20L | 74HC240D, SN74HC240DW, | Octal buffer/line driver; 3-state; inverting |
| EM74HC21PW | ENERGYMATH | TSSOP14L | 74HC21PW, CD74HC21PW, | Dual 4-input AND gate |
| EM74HC21D | ENERGYMATH | SOP-14L | 74HC21D, CD74HC21D, | Dual 4-input AND gate |
| EM74HC20PW | ENERGYMATH | TSSOP14L | 74HC20PW, CD74HC20PW, | Dual 4-input NAND gate |
| EM74HC20D | ENERGYMATH | SOP-14L | 74HC20D, CD74HC20D, | Dual 4-input NAND gate |
| EM74HC166PW | ENERGYMATH | TSSOP16L | 74HC166PW, SN74HC166PW, | 8-bit parallel-in/serial out shift register |
| EM74HC166D | ENERGYMATH | SOP-16L | 74HC166D, SN74HC166D, | 8-bit parallel-in/serial out shift register |
| EM74HC165APW | ENERGYMATH | TSSOP16L | 74HC165PW, SN74HC165PW, RS165XTSS16 | 8-bit parallel-in/serial out shift register |
| EM74HC165AD | ENERGYMATH | SOP-16L | 74HC165D, SN74HC165D, RS165XS16 | 8-bit parallel-in/serial out shift register |
| EL74HC165D | ENERGYMATH | SOP-16L | 74HC165D, SN74HC165D, RS165XS16 | 8-bit parallel-in/serial out shift register |
| EM74HC164APW | ENERGYMATH | TSSOP14L | 74HC164PW, SN74HC164PW, RS164XQ | 8-bit serial-in, parallel-out shift register |
| EM74HC164AD | ENERGYMATH | SOP-14L | 74HC164D, SN74HC164D, RS164XP | 8-bit serial-in, parallel-out shift register |
| EL74HC164D | ENERGYMATH | SOP-14L | 74HC164D, SN74HC164D, RS164XP | 8-bit serial-in, parallel-out shift register |
| EM74HC14PW | ENERGYMATH | TSSOP14L | 74HC14PW, SN74HC14PW, | Hex inverting Schmitt trigger |
| EM74HC14D | ENERGYMATH | SOP-14L | 74HC14D, SN74HC14D, | Hex inverting Schmitt trigger |
| EM74HC132PW | ENERGYMATH | TSSOP14L | 74HC132PW, SN74HC132PW, | Quad 2-input NAND Schmitt trigger |
| EM74HC132D | ENERGYMATH | SOP-14L | 74HC132D, SN74HC132D, | Quad 2-input NAND Schmitt trigger |