LM2903HD - Dual 36V Open-Collector Comparator | STMicroelectronics
料号： LM2903HD ✓ 量产中LM2903HD 概述
A voltage comparator is an analog integrated circuit that compares two input voltages and changes its output state when the difference crosses a defined threshold. The LM2903 belongs to the comparator hierarchy within analog and mixed-signal semiconductors. Its open-collector outputs can sink current from a pull-up network, making the device suitable for wired logic, relay drivers, and interface applications where the output must connect to another supply domain.
The STMicroelectronics LM2903 datasheet identifies a wide supply range of 2 V to 36 V under single-supply operation and ±1 V to ±18 V under dual-supply operation. It also specifies low supply-current drain independent of supply voltage and a typical drain of 0.4 mA per comparator. These characteristics allow economical operation from industrial, automotive, and embedded supply rails while preserving useful input and output operating ranges.
The differential input arrangement places the inverting and non-inverting terminals on separate comparator channels. When the voltage applied to the non-inverting input exceeds the corresponding inverting input, the associated open-collector output transitions according to the comparator's polarity. External resistors normally define the output high state because an open-collector transistor actively pulls the output low but does not source a sustained output voltage.
Typical LM2903HD applications include DC threshold detection, battery-voltage monitoring, sensor signal conditioning, window comparators, and logic-level translation. The dual-channel configuration reduces component count in circuits requiring two independent comparisons. Its open-collector outputs also support wired-AND behavior when multiple comparator outputs share a pull-up resistor.
PCB design should keep comparator inputs and feedback components away from switching nodes and high-current return paths. Place input resistors and feedback resistors close to the device, use a solid ground reference, and add supply bypassing where required by the implementation. Validate output pull-up values against sink-current limits, propagation delay, and the required logic rise time.
This product page combines manufacturer specifications, ordering information, package details, application guidance, and pin-compatible comparison information. It is designed to help engineers identify the LM2903HD quickly, verify its electrical limits, and select an appropriate second source without changing the PCB footprint.
直接替换替代料： LM2903HD ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： LM2903HD （相同外形与封装尺寸） ——差异在于 Comparator Type, Operating Temperature Range.
LM2903D
✅ 直接替换联系询价
查看数据手册 →LM2903D
✅ 直接替换联系询价
查看数据手册 →LM2903HD 最大额定值与电气特性
| Comparator Type | 2 channels |
| 功能 | Dual differential voltage comparator |
| 输出类型 | Open-collector |
| Single-Supply Voltage Range | 2 V to 36 V |
| Dual-Supply Voltage Range | ±1 V to ±18 V |
| Supply-Current Drain | 0.4 mA typical per comparator |
| Input Bias Current | 25 nA typical |
| 封装 | 8-pin SOIC |
| Package Type | 8-SO |
| 安装类型 | Surface mount |
| Packaging | Tube |
| 工作温度范围 | -40°C to +125°C |
| Number of Inputs | 4 differential inputs |
| 输出数量 | 2 open-collector outputs |
| RoHS 状态 | Compliant |
| REACH Status | Compliant |
| Automotive Qualification | Not applicable |
LM2903HD 8-so 引脚配置指南
LM2903HD（8-so 封装）的引脚配置。 该模拟元件具有输入、输出和电源引脚。请参阅制造商数据手册以了解失调调零、补偿和使能引脚配置。适用于信号调理和放大器电路。
暂无详细引脚数据： LM2903HD.
请参阅 数据手册 以查看完整引脚配置。
典型应用
LM2903HD 适用于 6 应用s: Battery Voltage Threshold Detection, Industrial Sensor Interfacing, Window and Limit Comparison, Logic Level Translation, Relay and Warning Indicator Drive, Portable Equipment Power Sequencing.
Battery Voltage Threshold Detection
The LM2903HD is suitable for detecting when a divided battery voltage crosses a defined threshold. One channel can compare a scaled sense voltage against a precision reference, while the second channel can monitor another boundary or provide window-comparator behavior. Its 2 V to 36 V single-supply range supports broad rail compatibility, and the typical 0.4 mA drain per comparator helps limit overhead in portable or industrial systems. The open-collector output can pull down a system reset, fault indication, or logic pull-up after the relevant transition.
推荐
Industrial Sensor Interfacing
The LM2903HD can condition a sensor signal by comparing it with an adjustable threshold established by external resistors. This is useful for limit switches, level detectors, and alarm inputs that must translate an analog quantity into a digital state. The dual-channel device provides two comparisons in one 8-SOIC package, reducing board area. Its wide 2 V to 36 V single-supply range permits operation from industrial rails, while the low 0.4 mA typical drain per comparator suits compact monitoring modules.
推荐
Window and Limit Comparison
A window comparator built around the LM2903HD can indicate when a monitored voltage lies above a lower threshold and below an upper threshold. The two independent channels can drive separate open-collector nodes, allowing an external logic network to produce a qualified range signal. This arrangement is useful in power-quality monitoring, instrument protection, and automated test systems. The device's differential inputs support reference-based sensing, and its 2 V to 36 V supply range accommodates multiple industrial and laboratory systems.
推荐
Logic Level Translation
The open-collector outputs of the LM2903HD can translate between logic domains by pulling a higher-voltage or lower-voltage pull-up rail to ground when the comparison condition is met. This arrangement is especially useful when the receiving logic cannot directly source the comparator output. Because the pull-up rail defines the output-high voltage, the same 8-pin device can bridge compatible systems with different voltage levels. Designers must verify input common-mode limits, output sink current, pull-up resistance, and resulting transition speed.
推荐
Relay and Warning Indicator Drive
An LM2903HD output can sink current through a relay coil, lamp warning path, or other indicator when a threshold is exceeded. The open-collector transistor avoids continuously sourcing current, allowing the load to use a separate supply where appropriate. The second channel can monitor a second fault condition or provide complementary behavior. Because inductive and high-current loads can introduce transients, the final design should include suitable flyback protection and should remain within the comparator's output-current and voltage limits.
推荐
Portable Equipment Power Sequencing
The LM2903HD can supervise two supply thresholds in a portable system and assert an open-collector power-good or fault signal. Its typical 0.4 mA drain per comparator is useful where continuous monitoring must not dominate the power budget, while the 2 V minimum single-supply operation allows use with low-energy rails. The comparator can operate from the rail it monitors or another suitable supply. System designers should account for start-up transients, input offset, hysteresis resistors, and the voltage required by the downstream logic.
推荐
推荐产品汇总
工程参考数据： LM2903HD ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | LM2903D | LM2903D | LM2903D | LM2903D |
|---|---|---|---|---|---|
| Brand | STMicroelectronics | STMicroelectronics | onsemi | 3PEAK | Texas Instruments |
| Package | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC |
| Comparator Configuration | Dual differential comparator | Dual differential comparator | Dual differential comparator | Dual differential comparator | Dual differential comparator |
| Output Type | Open-collector | Open-collector | Open-collector | Open-collector | Open-collector |
| Number of Channels | 2 | 2 | 2 | 2 | 2 |
关键差异点
- Exact same-manufacturer LM2903-family option （对比 STMicroelectronics LM2903D)
- Broad cross-brand sourcing choice （对比 onsemi LM2903D)
- Industrial-temperature alternative option （对比 3PEAK LM2903D)
- Wide supply compatibility （对比 Texas Instruments LM2903D)
设计说明
Do not treat the open-collector output as a push-pull logic output. Add a pull-up resistor to the intended positive logic rail and confirm that the low-state sink current, including the pull-up current and attached load, remains within the device's output-current limit. A smaller pull-up produces a faster rising edge but increases low-state current; a larger pull-up reduces current but slows the transition through output capacitance.
Place the comparator input resistors, reference network, and feedback resistors close to the corresponding pins. Keep these nodes away from switching-power traces, relay-driver wiring, and high-current return paths. A solid ground plane and short return connections reduce susceptibility to common-mode voltage shifts. If the open-collector output drives a cable or long trace, route it away from sensitive input nets and evaluate the resulting capacitance with the selected pull-up resistor.
Check the input common-mode range at every operating point, especially when the supply falls close to the signal amplitude. The wide 2 V to 36 V supply capability does not mean that every input can follow the supply rail. For threshold circuits, add controlled hysteresis where chatter or noise near the reference could cause repeated output transitions, and verify the resistor values against the actual reference voltage and input offset requirements.
Power the LM2903HD from a rail that remains valid during startup, shutdown, and fault conditions, or confirm that the downstream logic tolerates an undefined comparator state. The typical supply-current drain is 0.4 mA per comparator, but total system demand also includes pull-up networks and attached loads. Decouple the supply close to the device according to the applicable circuit-implementation guidance, and account for input transients during power sequencing.
合规信息
RoHS and REACH compliance are identified for the LM2903 family. No automotive qualification, lead-free statement, halogen-free statement, or conflict-minerals declaration was established for the exact LM2903HD order code.