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 |
|---|---|---|---|---|
| EM74HCS74D | ENERGYMATH | Dual D-type flip-flop with set and reset; positive-edge trigger; Schmitt trigger | SOP-14L | |
| EM74HCS7266PW | ENERGYMATH | SN74HCS7266PW, | Quad 2-Input XNOR Gates Schmitt trigger | TSSOP14L |
| EM74HCS7266D | ENERGYMATH | Quad 2-Input XNOR Gates Schmitt trigger | SOP-14L | |
| EM74HCS4075PW | ENERGYMATH | SN74HCS4075PW, | Triple 3-input OR gate Schmitt trigger | TSSOP14L |
| EM74HCS4075D | ENERGYMATH | SN74HCS4075D, | Triple 3-input OR gate Schmitt trigger | SOP-14L |
| EM74HCS367PW | ENERGYMATH | SN74HCS367PW, | Hex buffer/line driver; 3-state Schmitt trigger | TSSOP16L |
| EM74HCS367D | ENERGYMATH | SN74HCS367D, | Hex buffer/line driver; 3-state Schmitt trigger | SOP-16L |
| EM74HCS365PW | ENERGYMATH | SN74HCS365PW, | Hex buffer/line driver; 3-state Schmitt trigger | TSSOP16L |
| EM74HCS365D | ENERGYMATH | SN74HCS365D, | Hex buffer/line driver; 3-state Schmitt trigger | SOP-16L |
| EM74HCS32PW | ENERGYMATH | SN74HCS32PW, | Quad 2-input OR gate Schmitt trigger | TSSOP14L |
| EM74HCS32D | ENERGYMATH | SN74HCS32D, | Quad 2-input OR gate Schmitt trigger | SOP-14L |
| EM74HCS27PW | ENERGYMATH | SN74HCS27PW, | Triple 3-input NOR gate Schmitt trigger | TSSOP14L |
| EM74HCS27D | ENERGYMATH | SN74HCS27D, | Triple 3-input NOR gate Schmitt trigger | SOP-14L |
| EM74HCS266PW | ENERGYMATH | SN74HCS266PW, | Dual 4-input XNOR gate; Schmitt trigger | TSSOP14L |
| EM74HCS266D | ENERGYMATH | SN74HCS266D, | Dual 4-input XNOR gate; Schmitt trigger | SOP-14L |
| EM74HCS245PW | ENERGYMATH | SN74HCS245, | Octal Bus Transceivers with 3-State Outputs and Schmitt-Trigger Inputs | TSSOP20L |
| EM74HCS245D | ENERGYMATH | SN74HCS245, | Octal Bus Transceivers with 3-State Outputs and Schmitt-Trigger Inputs | SOP-20L |
| EM74HCS244PW | ENERGYMATH | SN74HCS244, | Octal Buffers and Line Drivers with Schmitt-Trigger Inputs and 3-State Outputs | TSSOP20L |
| EM74HCS244D | ENERGYMATH | SN74HCS244, | Octal Buffers and Line Drivers with Schmitt-Trigger Inputs and 3-State Outputs | SOP-20L |
| EM74HCS21PW | ENERGYMATH | SN74HCS21PW, | Dual 4-input AND gate; Schmitt trigger | TSSOP14L |