LM2903QS-13 - 36V Dual Precision Comparator | Diodes Incorporated
料号： LM2903QS-13 ✓ 量产中LM2903QS-13 概述
A voltage comparator is an analog interface IC that evaluates two input voltages and switches its output when one input becomes higher than the other. Within the semiconductor hierarchy, a comparator belongs to the amplifier IC family, supports signal conditioning, and is frequently used to bridge low-level analog measurements to digital logic. The LM2903 contains two independent comparators, allowing one package to monitor two thresholds or perform two independent decisions.
The low input offset and bias-current characteristics support precise threshold decisions when signals originate from sensors, dividers, or low-level analog stages. The common-mode input range includes ground, a useful property for single-supply systems whose signals remain near the lower rail. Open-collector outputs also allow the two channels to be connected together for wired-AND operation and permit external pull-up resistors to establish the logic-high voltage independently of the comparator supply.
The LM2903 architecture emphasizes low power consumption and broad supply compatibility rather than high-speed comparator performance. According to the Diodes Incorporated datasheet, the series supports single-supply operation over a wide voltage range and split-supply operation as well. This makes it suitable for industrial, automotive, and embedded systems where a sensing element compares a variable voltage against a reference before driving a control, fault, or sequencing circuit.
Typical applications include supply sequencing, battery and power-system threshold detection, sensor signal conditioning, window-comparator implementations, overvoltage and undervoltage protection, and general digital-logic interfacing. Two independent channels can implement a two-threshold system, compare two sensor signals, or provide one always-enabled channel and one conditionally monitored channel. The 8-pin SOIC footprint is convenient for conventional surface-mount assembly.
The principal design consideration is the open-collector output. Each output requires a pull-up resistor to the appropriate logic supply, and the selected resistor must satisfy the output sink-current and rise-time requirements. Inputs should also remain within their specified common-mode and differential ranges, while supply decoupling should be placed close to the device to limit switching-induced disturbance.
This product record combines the LM2903QS-13 electrical identity, automotive-grade package information, family-level replacement context, and application-focused design guidance. It helps engineers identify the correct SOIC-8 part, understand its threshold-measurement role, and compare it with same-footprint dual-comparator options before finalizing a PCB or BOM revision.
直接替换替代料： LM2903QS-13 ——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： LM2903QS-13 （相同外形与封装尺寸） ——差异在于 Comparator Type, Input Bias Current, Input Offset Voltage, Package, Supply Current.
LM2903AQS-13
✅ 直接替换联系询价
查看数据手册 →LM2903-Q1
✅ 直接替换📋 参考替代料（不在目录中）
LM2903BIDR
✅ 直接替换联系询价
查看数据手册 →LM2903DQ
✅ 直接替换📋 参考替代料（不在目录中）
LM2903BIDR
✅ 直接替换联系询价
查看数据手册 →LM2903QS-13 最大额定值与电气特性
| Comparator Type | Dual precision voltage comparator |
| Number of Channels | 2 channels |
| Maximum Supply Voltage | 36 V |
| Split-Supply Voltage Rating | ±18 V |
| Input Offset Voltage | 2 mV |
| Input Bias Current | 25 nA |
| Input Offset Current | 5 nA |
| 电源电流 | 0.6 mA |
| 输出类型 | Open-collector |
| Common-Mode Input Range | Includes ground |
| Supply Configuration | Single or split supply |
| 封装 | 8-pin SOIC |
| 安装类型 | Surface mount |
| Automotive Qualification | AEC-Q100 qualified |
LM2903QS-13 8-pin soic 引脚配置指南
LM2903QS-13（8-pin soic 封装）的引脚配置。 该功率器件具有栅极、漏极和源极端子。对于无极性封装，请参阅制造商数据手册以了解确切的引脚 1 方向和封装尺寸细节。常见应用包括电源设计、电机驱动和负载开关。
暂无详细引脚数据： LM2903QS-13.
请参阅 数据手册 以查看完整引脚配置。
典型应用
LM2903QS-13 适用于 6 应用s: Automotive Supply Sequencing, Battery Voltage Threshold Detection, Sensor Signal Conditioning, Overvoltage and Undervoltage Protection, Window Comparator Monitoring, Digital Logic Interfacing.
Automotive Supply Sequencing
The LM2903QS-13 fits automotive supply-sequencing and rail-monitoring logic because it provides two independent precision comparators in an AEC-Q100-qualified 8-pin SOIC package. Its 36 V maximum supply rating is appropriate for systems whose monitored rail can exceed conventional low-voltage logic levels. Place one channel across the rail and a reference divider, then use the open-collector output to inhibit a load until the rail crosses the selected threshold. The pull-up resistor sets the logic-high voltage independently, while the second channel can supervise another rail or provide an undervoltage condition. Confirm the common-mode limits, differential-input limits, and automotive temperature grade against the final vehicle electrical environment.
推荐
Battery Voltage Threshold Detection
The LM2903QS-13 is useful for battery-powered systems that must translate an analog battery voltage into a logic fault or shutdown command. Its 0.6 mA listed supply current helps limit standing load, while the common-mode input range including ground supports comparisons near the lower rail. A resistor divider can scale the battery voltage to the comparator input, with the reference established by another divider or precision source. The open-collector output can pull a system-control line low without injecting additional supply current into the measured battery rail. Select resistor values for the required threshold and check input bias-current error, as the 25 nA bias rating can shift a high-impedance divider reference.
推荐
Sensor Signal Conditioning
The LM2903QS-13 can condition a sensor output by comparing the analog signal with a reference threshold and producing a clean open-collector logic event. The 2 mV input offset specification supports decisions where the sensor signal changes only slightly around the threshold, while the 25 nA input bias current is suitable for many resistive sensing networks. For a resistive divider or bridge-derived signal, connect the sensed voltage to one input and the chosen reference to the other. Add a pull-up resistor to establish the required digital level, and size the divider to limit loading and offset error. Validate the common-mode range at the lowest sensor output and confirm that the chosen switching speed is sufficient for the measured signal.
推荐
Overvoltage and Undervoltage Protection
The LM2903QS-13 supports independent overvoltage and undervoltage protection by assigning one channel to a high threshold and the other to a low threshold. The 36 V maximum supply rating gives design margin when the monitored input is derived from an automotive or industrial rail, and the AEC-Q100 qualification is relevant to vehicle systems. Build each threshold from a resistor divider and reference, then combine the open-collector outputs with pull-up resistors and wired-AND logic when both fault conditions must disable a load. Keep the sensing network separate from high-current switching paths to minimize threshold errors. Confirm resistor tolerance, input offset, common-mode limits, and output timing before using the device as a protection barrier.
推荐
Window Comparator Monitoring
Two independent LM2903QS-13 channels can implement a window comparator in which an output changes state only when the monitored voltage lies between an upper and lower limit. The low 2 mV input offset can reduce boundary error when the limits are tightly spaced, and the open-collector outputs can be tied together through pull-up resistors to create the required fault signal. Use precision divider resistors and account for their tolerance and temperature coefficient, since resistor errors may dominate the comparator offset in a narrow-window design. The common-mode input range includes ground, which helps when the lower window boundary is near the supply rail. Verify the exact differential-input and common-mode limits before finalizing the sensing network.
推荐
Digital Logic Interfacing
The LM2903QS-13 can bridge an analog decision to open-collector digital logic where the required logic-high voltage differs from the comparator supply. Each output sinks current from an external pull-up, allowing one device to drive TTL-, MOS-, or CMOS-compatible interfaces when voltage, current, and timing requirements are confirmed. A resistor at the output also permits wired-AND operation across multiple comparators or other open-collector devices. Keep the pull-up rail within the logic family being driven and calculate its maximum sink current from the resistor value. The stated 0.6 mA supply current supports low-power operation, but propagation delay and output saturation should be checked for the target bus and switching frequency.
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推荐产品汇总
工程参考数据： LM2903QS-13 ——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 | LM2903AQS-13 | LM2903-Q1 | LM2903 | LM2903DQ | LM2903 |
|---|---|---|---|---|---|---|
| Package | SOIC-8 | SOIC-8 | SOIC-8 | SOIC-8 | SOIC-8 | SOIC-8 |
| Brand | Diodes Incorporated | Diodes Incorporated | Texas Instruments | Texas Instruments | 3PEAK | 3PEAK |
| Comparator Channels | 2 | 2 | 2 | 2 | 2 | 2 |
| Maximum Supply Voltage | 36 V | 36 V | 36 V | 36 V | 36 V | 36 V |
| Output Type | Open-collector | Open-collector | Open-collector | Open-collector | Open-collector | Open-collector |
关键差异点
- Automotive-qualified dual comparator in the 8-pin SOIC footprint （对比 3PEAK LM2903DQ)
- Single-manufacturer option for continued family sourcing （对比 Texas Instruments LM2903-Q1)
- Low offset and bias-current ratings for precision threshold decisions （对比 3PEAK LM2903)
- Ground-inclusive common-mode operation for single-supply sensing （对比 3PEAK LM2903DQ)
设计说明
Treat the open-collector pull-up as part of the power budget. For a pull-up connected to voltage VPU through resistance R, the maximum resistor dissipation occurs when the comparator output is low and is approximately P = VPU²/R. Select R so the comparator's output sink-current rating is not exceeded, while choosing a sufficiently small resistance to meet the required rising-edge time. The 0.6 mA device supply rating does not include current drawn through the pull-up.
Place the IC close to the divider, reference, and pull-up network so switching currents do not flow through sensitive analog traces. Keep the comparator ground connection short and connect it to the quiet ground path used by the sensed signal. Place a local supply-bypass capacitor near the supply pins if the selected application circuit specifies one. Avoid routing the high-impedance input node beneath or beside switching-power and digital-clock traces.
Do not assume that equal package dimensions guarantee an interchangeable comparator. Verify pin numbering, channel orientation, input polarity, common-mode range, differential-input limits, output timing, and qualification for the exact alternative MPN. Also confirm that the pull-up voltage is compatible with the downstream logic and that all sensing resistors remain within the allowed supply and common-mode limits.
Estimated: the comparator's own dissipation from its 0.6 mA supply rating at 36 V is approximately 21.6 mW before accounting for input and output currents. The pull-up resistor may dissipate more power than the IC when its resistance is low. Check the resistor's rated dissipation and the SOIC package temperature rise using the PCB copper area, ambient temperature, and manufacturer thermal data before defining the maximum operating voltage for continuous use.
合规信息
The automotive AEC-Q100 qualification is identified by the manufacturer product-page listing. RoHS, REACH, lead-free, halogen-free, and conflict-minerals status were not identified.