LM2903DMR2 - Dual Precision Comparator, 36 V | onsemi
料号： LM2903DMR2 ✓ 量产中LM2903DMR2 概述
A voltage comparator is an analog integrated circuit that evaluates two input voltages and changes its output state according to their relationship. The LM2903 belongs to the comparator hierarchy within analog signal-processing and interface ICs. Its two independent channels allow a single package to monitor two unrelated signals, while single- or split-supply operation makes it useful across industrial, automotive, and embedded power-control systems.
The LM2903 series provides a common-mode input range that extends to ground under single-supply operation. This characteristic is important when a monitored signal can approach 0 V. The low-offset-voltage designation indicates that the comparators are intended to detect relatively small differential voltages, although the exact offset limits depend on the operating conditions specified in the onsemi datasheet.
Each channel operates independently, allowing different threshold networks and signal pairs to share the package. The device supports supply voltages up to 36 V, which provides headroom for industrial and automotive environments. Its comparator outputs are designed for interfacing with conventional logic, although output topology, sink-current limits, and pull-up requirements must be confirmed from the manufacturer datasheet before final circuit design.
Typical uses include power-supply sequencing, battery and charger threshold detection, overvoltage and undervoltage protection, window monitoring, sensor-level detection, and general signal conditioning. In a power system, the two channels can monitor independent rails or compare a feedback voltage against a reference. The open-collector-style interface also allows multiple devices to share a pull-up arrangement when the required bus architecture and current limits are appropriate.
When laying out the circuit, keep comparator input nodes short and shield them from switching nodes and high-current paths. Confirm whether the selected output configuration requires an external pull-up resistor, and use that resistor to satisfy the downstream logic's rise-time requirements. Check supply-decoupling placement at the device pins and verify input and output limits for the complete temperature range.
This product record combines the LM2903DMR2 electrical description, verified source links, same-package alternatives, application guidance, and design checks to support faster component selection and PCB-level engineering decisions.
直接替换替代料： LM2903DMR2 ——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： LM2903DMR2 （相同外形与封装尺寸） ——差异在于 Comparator Type, Package, Output Type, Input Common-Mode Range, Input Offset Voltage.
LM393DMR2G
✅ 直接替换联系询价
查看数据手册 →NCV2903DMR2G
✅ 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 →BA2903F-E2
✅ 直接替换📋 参考替代料（不在目录中）
LM2903DMR2 最大额定值与电气特性
| Comparator Type | Dual independent precision voltage comparator |
| Number of Channels | 2 channels |
| Supply Voltage Range | 2 V to 36 V |
| Maximum Supply Voltage | 36 V |
| Split-Supply Operation | Supported |
| Common-Mode Input Range | Includes ground during single-supply operation |
| 封装 | 8-pin SOIC |
| 安装类型 | Surface mount |
| Shipping Form | Tape and reel |
LM2903DMR2 8-pin soic 引脚配置指南
LM2903DMR2（8-pin soic 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： LM2903DMR2.
请参阅 数据手册 以查看完整引脚配置。
典型应用
LM2903DMR2 适用于 6 应用s: Industrial Power-Supply Sequencing, Battery Overvoltage and Undervoltage Detection, Charger and Power-Path Control, Motor and Solenoid Feedback Monitoring, Sensor-Level Signal Detection, Automotive and Heavy-Vehicle Status Monitoring.
Industrial Power-Supply Sequencing
The LM2903DMR2 fits two-stage industrial power sequencing because it provides two independent comparator channels, accepts supply operation up to 36 V, and can compare divided rail voltages against references. Each channel can monitor a different rail, allowing enable, fault, or undervoltage decisions to be generated independently. Its common-mode range extending to ground is useful when a monitored signal starts near 0 V. In implementation, account for the difference between supply voltage and signal amplitude, add hysteresis where switching noise could cause repeated transitions, and verify that every divided input remains within the datasheet's common-mode range. The package's SOIC-8 footprint supports conventional surface-mount assembly, while dual integration reduces the number of comparator packages required on a multi-rail controller.
推荐
Battery Overvoltage and Undervoltage Detection
The LM2903DMR2 can divide a battery or DC bus into two comparator channels for independent upper- and lower-threshold detection. Its 36 V maximum supply rating provides useful operating headroom in many industrial battery systems, while the ground-referenced common-mode capability supports detection near the bottom of the discharge range. Place the divider so the sensed voltage does not exceed the comparator's input limits, and include resistor tolerances in the threshold-error budget. Use positive feedback to create hysteresis when the application must reject battery ripple or switching-node excursions. The SOIC-8 package also leaves room for the two output pull-up networks and the external divider components, although careful placement is needed to keep the high-impedance divider node away from noisy power paths.
推荐
Charger and Power-Path Control
The LM2903DMR2 is appropriate for charger or power-path control because two independent comparators can evaluate an input rail and a battery-related voltage without sharing an internal channel state. The 36 V supply capability is useful in systems with automotive-like transients, while operation from split supplies allows positive and negative signaling stages where the common-mode limits permit it. The comparator outputs can represent charge-permit, power-good, or fault conditions to a controller. Design the divider networks to preserve margin from the input thresholds, and verify output behavior during startup and supply ramp conditions. If a comparator controls a switching power path, isolate its input node from high-dv/dt switching traces because displacement current through the divider can create false threshold crossings.
推荐
Motor and Solenoid Feedback Monitoring
The LM2903DMR2 can supervise two feedback or supply signals associated with a motor-control subsystem, such as a current-sense amplifier output and a motor-supply rail. The comparator's dual-channel structure allows one channel to detect an upper limit and the other a lower limit, while its common-mode capability down to ground is useful for signals centered around a zero-volt reference. Place the sense amplifier output through appropriately rated resistors rather than relying on the comparator input to absorb excessive current. Add a small hysteresis network when the monitored quantity includes ripple, and route the comparator inputs away from motor-switching nodes to minimize coupled noise. Verify the allowable input range and output response over the full motor-supply variation and environmental temperature range specified for the exact onsemi device.
推荐
Sensor-Level Signal Detection
The LM2903DMR2 can compare two low-level sensor outputs when the signals remain inside the device's common-mode input range. For example, one channel may detect a sensor crossing an upper limit while the other detects a lower limit, producing discrete state information for a controller. The low-offset-voltage family is suited to threshold detection, but the exact offset and common-mode limits must be evaluated at the operating temperature. Keep sensor traces short, use a high-impedance divider where appropriate, and place the reference or threshold network close to the comparator inputs. If the sensor has a slow output, add controlled hysteresis to prevent comparator chatter without suppressing genuine threshold crossings. The 8-pin SOIC package provides a practical footprint for two channels and their external support components.
推荐
Automotive and Heavy-Vehicle Status Monitoring
The LM2903DMR2 can support battery, charger, or actuator-status monitoring in heavy-vehicle and industrial vehicle systems where 24 V and 36 V-class environments are common. Two independent channels allow compact supervision of two rails, and the 36 V maximum supply rating provides practical headroom for those systems. Automotive production use nevertheless requires confirmation that the exact ordered device has the required qualification and temperature rating; the onsemi NCV2903DMR2G is the documented automotive-oriented candidate. Preserve input headroom for transient overshoot, use resistor ratings suitable for the vehicle power bus, and isolate comparator traces from motor and solenoid switching nodes. Review common-mode limits, output current, and package performance across the complete operating-temperature requirement.
推荐
推荐产品汇总
工程参考数据： LM2903DMR2 ——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 | LM393DMR2G | NCV2903DMR2G | LM2903BIDR | BA2903F-E2 | LM2903D |
|---|---|---|---|---|---|---|
| Package | SOIC-8 | SOIC-8 - same | SOIC-8 - same | SOIC-8 - same | SOIC-8 - same | SOIC-8 - same |
| Brand | onsemi | onsemi | onsemi | Texas Instruments | Rohm Semiconductor | Texas Instruments |
| Comparator Configuration | Dual independent comparator | Dual comparator | Dual comparator | Dual comparator | Dual comparator | Dual comparator |
关键差异点
- Dual independent channels in one 8-pin package （对比 LM2903BIDR)
- 36 V supply-operation ceiling （对比 BA2903F-E2)
- Onsemi automotive-oriented alternative for qualified designs （对比 NCV2903DMR2G)
设计说明
Keep the two comparator input networks close to their corresponding pins and connect each ground reference directly to the device ground connection. Avoid routing inputs alongside switching-node copper or high-current motor and relay paths. If a divider drives the input, place its ground return near the comparator and use a dedicated return path so input-node displacement current does not shift the apparent threshold.
Place the required supply bypass capacitor as close as practical to the comparator supply and ground pins. The datasheet's maximum supply rating is 36 V, but that rating does not authorize operation without margin for transient overshoot, supply ramp behavior, or fault conditions. Check every divided input against both the common-mode range and maximum differential voltage before committing the threshold divider values.
Do not assume that an LM2903-family substitute has identical offset, common-mode, output-current, or temperature limits merely because it uses the same SOIC-8 outline. Review the exact pin descriptions, validate the output pull-up arrangement, and recalculate threshold accuracy when changing manufacturers. Add hysteresis when the monitored signal contains ripple or crosses the reference slowly, preventing repeated output transitions near the decision point.
合规信息
Compliance declarations are not stated in the accessible part description. Confirm RoHS, REACH, lead-free, halogen-free, conflict-minerals, and automotive qualification status for the exact ordering code before release.