LM2903HD - Dual 36V Open-Collector Comparator | STMicroelectronics
MPN： LM2903HD ✓ 啟用中LM2903HD 概覽
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.
直接替換替代品，適用於 LM2903HD — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： LM2903HD （相同外形與佔位） — 差異在於 Comparator Type, Operating Temperature Range.
LM2903D
✅ 直接替換聯絡詢價
查看資料表 →LM2903D
✅ 直接替換聯絡詢價
查看資料表 →LM2903HD 最大額定值與電氣特性
| Comparator Type | 2 channels |
| 功能 | Dual differential voltage comparator |
| 輸出類型 | 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 |
| 封裝 | 8-pin SOIC |
| Package Type | 8-SO |
| 安裝類型 | Surface mount |
| Packaging | Tube |
| 工作溫度範圍 | -40°C to +125°C |
| Number of Inputs | 4 differential inputs |
| 輸出數量 | 2 open-collector outputs |
| RoHS 狀態 | Compliant |
| REACH Status | Compliant |
| Automotive Qualification | Not applicable |
LM2903HD 8-so 腳位配置指南
LM2903HD（8-so 封裝）的腳位配置。 此類比元件具有輸入、輸出與電源腳位。偏移歸零、補償與致能腳位配置請參閱製造商資料表。適用於訊號調理與放大器電路。
無詳細腳位定義資料： LM2903HD.
請參閱 資料表 以查看完整腳位配置。
典型應用
LM2903HD 適用於 6 應用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.
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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.
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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.
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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.
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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.
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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.
推薦
推薦產品摘要
工程參考資料，適用於 LM2903HD — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | 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 |
主要差異化特點
- Exact same-manufacturer LM2903-family option (對比STMicroelectronics LM2903D)
- Broad cross-brand sourcing choice (對比onsemi LM2903D)
- Industrial-temperature alternative option (對比3PEAK LM2903D)
- Wide supply compatibility (對比Texas Instruments LM2903D)
設計說明
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.
合規資訊
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.