LM393 alternatives & equivalent parts
Dual differential comparator — common packages: SOIC-8, PDIP-8. Each candidate below cites its manufacturer datasheet; check the relationship badge before substituting.
5 verified alternatives for LM393
| Alternative | Manufacturer | Relationship | Key differences | Source |
|---|---|---|---|---|
| LM293 | Texas Instruments | Pin-to-pinDrop-in: same footprint and pinout. | Same dual-comparator die in a wider temperature grade: -25 to +85 C versus LM393's 0 to +70 C. Same 2-36 V supply range and identical 8-pin pinout. | TI 官方数据手册 |
| LM2903 | Texas Instruments | Pin-to-pinDrop-in: same footprint and pinout. | Extended/industrial temperature grade (-40 to +125 C); otherwise the same dual comparator, supply range, and pinout as LM393. | TI 官方数据手册 |
| LM393B | Texas Instruments | Pin-to-pinDrop-in: same footprint and pinout. | Next-generation drop-in replacement: supply rated to 38 V (vs 36 V), lower input offset voltage and bias current, and faster response than the classic LM393. TI explicitly lists it as a drop-in replacement for LM393. | TI 官方数据手册 |
| LM2903B | Texas Instruments | Pin-to-pinDrop-in: same footprint and pinout. | Next-generation drop-in in the extended temperature grade: up to 38 V supply with improved offset and speed over LM2903/LM393. TI explicitly lists it as a drop-in replacement. | TI 官方数据手册 |
| TS393 | STMicroelectronics | Pin-to-pinDrop-in: same footprint and pinout. | ST's CMOS dual comparator, stated pin-to-pin and functionally compatible with bipolar LM393. Supply limited to 2.7-16 V (vs 2-36 V for LM393) and much lower supply/bias current; check output drive and response speed before substituting. | ST 官方页面 |
Key parameters from manufacturer datasheets
| 型号 | 制造商 | 供电范围 | 静态电流 | 输入失调电压 | 响应时间 | 温度范围 | 封装 | 数据来源 |
|---|---|---|---|---|---|---|---|---|
| LM393 | Texas Instruments | 2–30V（绝对最大 36V） | 0.45mA typ / 1mA max（@5V，双通道合计） | 2mV typ / 5mV max（@25°C） | 1.3µs typ（5mV过驱）/ 0.3µs（TTL阶跃） | 0–+70°C | SOIC-8、PDIP-8、TSSOP-8、VSSOP-8、SOT-23 | TI 官方数据手册 |
| LM293 | Texas Instruments | 2–30V（绝对最大 36V） | 0.45mA typ / 1mA max（@5V，双通道合计） | 2mV typ / 5mV max（@25°C） | 1.3µs typ（5mV过驱）/ 0.3µs（TTL阶跃） | -25–+85°C | SOIC-8、PDIP-8、VSSOP-8 | TI 官方数据手册 |
| LM2903 | Texas Instruments | 2–30V（绝对最大 36V） | 0.8mA typ / 1mA max（@5V，双通道合计） | 2mV typ / 7mV max（@25°C） | 1.3µs typ（5mV过驱）/ 0.3µs（TTL阶跃） | -40–+125°C | SOIC-8、PDIP-8、TSSOP-8、VSSOP-8、SOT-23 | TI 官方数据手册 |
| LM393B | Texas Instruments | 2–36V（绝对最大 38V） | 400µA typ / 600µA max（@5V，双通道合计） | 0.37mV typ / ±2.5mV max（@25°C） | 1.0µs typ（5mV过驱）/ 300ns（TTL） | -40–+85°C | SOIC-8、TSSOP-8、VSSOP-8、SOT-23、WSON-8 | TI 官方数据手册 |
| LM2903B | Texas Instruments | 2–36V（绝对最大 38V） | 400µA typ / 600µA max（@5V，双通道合计） | 0.37mV typ / ±2.5mV max（@25°C） | 1.0µs typ（5mV过驱）/ 300ns（TTL） | -40–+125°C | SOIC-8、TSSOP-8、VSSOP-8、SOT-23、WSON-8 | TI 官方数据手册 |
| TS393 | STMicroelectronics | 2.7–16V | — | — | — | — | — | ST 官方页面 |
参数以制造商数据手册为准（TI SLCS005AH；TS393 以 ST 数据手册为准），替代前请核对原理图。
BEFORE YOU SUBSTITUTEPre-replacement checklist
- Match the package (SOIC-8 vs PDIP-8) and confirm the pinout before soldering.
- Confirm the supply rail: TS393 only supports 2.7-16 V, while LM393-family parts run 2-36 V (LM393B/LM2903B to 38 V).
- Check input offset voltage and response time for precision or fast-switching uses.
- Verify the temperature grade matches the application (LM2903/LM2903B for -40 to +125 C).
Frequently asked questions about replacing LM393
LM2903 能否直接替换 LM393？
可以。LM2903 是 LM393 的工业温度等级版本（-40 至 +125°C），引脚排列与封装相同，核心电气特性一致；替换前确认温度等级符合应用要求即可。
LM393B 与 LM393 有什么区别？
LM393B 是 TI 的新一代直接替换型号，供电最高 38V（LM393 为 36V），输入失调电压和偏置电流更低、响应更快；TI 明确将其列为 LM393 的 drop-in 替代。
TS393 能否替换 LM393？
引脚兼容但有限制：TS393 是 CMOS 工艺，供电仅 2.7–16V（LM393 为 2–36V）；若原设计供电超过 16V 或依赖双极型输出驱动能力，不能直接替换，替换前请核对供电轨。
替换时需要改 PCB 吗？
5 个型号均有 SOIC-8 版本且引脚对引脚兼容，不需要改板；但替换前仍需核对封装、供电轨、失调电压与温度等级是否满足原设计。
Need the exact lot, date code or a second source quoted?
Send the original MPN and the approved alternative. Sourceics reconfirms source, stock, date code and commercial terms before any order — no substitution without your engineering approval.
Request a quote for LM393Source part reference: TI 官方数据手册. Equivalence notes are reference guidance, not a guarantee of fit — always verify against your schematic and layout.