LM2903QPWRG4Q1 - Dual 36V Automotive Comparator | TI
料号： LM2903QPWRG4Q1 ✓ 量产中LM2903QPWRG4Q1 概述
A differential comparator compares two input voltages and changes its output state according to the polarity of the difference between them. The LM2903-Q1 family contains two independent comparators, allowing one package to implement two threshold decisions, window monitoring functions, or independent protection channels. Its wide input and supply voltage ranges support battery-derived systems, industrial control boards, and 24 V vehicle electrical environments.
The automotive-qualified LM2903QPWRG4Q1 provides low offset voltage, low supply current, low input bias current, 1.3 microsecond propagation delay, and improved 2 kV ESD performance. Its open-collector outputs allow wired-AND operation with an external pull-up resistor and permit the output voltage to be referenced independently of the internal supply. This makes the device practical for interfacing with logic gates, relay drivers, and systems requiring fail-safe output states.
The LM2903-Q1 family is designed for drop-in convenience with established LM2903-family footprints, helping reduce redesign effort when automotive qualification and a 36 V maximum supply are required. The 8-pin TSSOP package supports compact surface-mount layouts, while the -40 C to +125 C operating range supports harsh industrial and vehicle environments.
Typical uses include automotive battery monitoring, overvoltage and undervoltage detection, fan-speed control, sensor conditioning, power-supply supervision, and industrial control systems. The dual architecture also allows both halves to operate independently, although their input common-mode behavior and output pull-up network must be checked against the system requirements.
When laying out the board, keep comparator inputs away from switching nodes and route the ground reference directly to the device ground pin. Choose the external output pull-up for the required logic family, account for the open-collector sink-current limit, and validate the design across the full temperature range. This page combines manufacturer specifications, package details, verified listing information, drop-in alternatives, and practical design guidance for faster component selection.
直接替换替代料： LM2903QPWRG4Q1 ——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： LM2903QPWRG4Q1 （相同外形与封装尺寸） ——差异在于 Package, Output Type, Operating Temperature Range, Supply Current, Automotive Qualification.
LM2903QPWRQ1
✅ 直接替换联系询价
查看数据手册 →LM2903DRG4
✅ 直接替换联系询价
查看数据手册 →LM2903M/NOPB
✅ 直接替换📋 参考替代料（不在目录中）
LM2903PWRG3
✅ 直接替换联系询价
查看数据手册 →LM2903QPWRG4Q1 最大额定值与电气特性
| Comparator Type | Dual differential comparator |
| Number of Channels | 2 |
| Supply Voltage Range, Single | 2 V to 36 V |
| Supply Voltage Range, Dual | +/-18 V |
| 输出类型 | Open-collector, CMOS/MOS/TTL-compatible |
| Propagation Delay | 1.3 us |
| 电源电流 | 0.4 mA |
| Automotive Qualification | AEC-Q100 Grade 0 and Grade 1 |
| ESD Performance | 2 kV |
| 工作温度范围 | -40 C to +125 C |
| 封装 | 8-pin TSSOP (PW), 0.173 inch width |
| 安装类型 | Surface mount |
| Packaging | Tape and reel |
| RoHS Compliance | RoHS compliant |
| REACH Compliance | Unknown |
| Lead-Free Status | Yes |
LM2903QPWRG4Q1 引脚配置
| 引脚 1 | OUT1 — Open-collector output of comparator channel 1 |
| 引脚 2 | IN1- — Inverting input of comparator channel 1 |
| 引脚 3 | IN1+ — Non-inverting input of comparator channel 1 |
| 引脚 4 | GND — Ground connection |
| 引脚 5 | IN2+ — Non-inverting input of comparator channel 2 |
| 引脚 6 | IN2- — Inverting input of comparator channel 2 |
| 引脚 7 | OUT2 — Open-collector output of comparator channel 2 |
| 引脚 8 | VCC — Positive supply connection |
典型应用
LM2903QPWRG4Q1 适用于 6 应用s: Automotive Battery Voltage Monitoring, Industrial Overvoltage Protection, Fan and Motor Speed Control, Power Supply Fault Detection, Sensor Threshold Conditioning, Window Limit and Safety Monitor.
Automotive Battery Voltage Monitoring
The LM2903QPWRG4Q1 fits 12 V and 24 V vehicle battery monitoring because each channel can compare a divided battery voltage against a precision reference. Its 36 V single-supply capability provides margin above nominal automotive rails, while AEC-Q100 Grade 0 and Grade 1 qualification supports harsh-temperature use. One comparator can detect overvoltage and the other undervoltage, with open-collector outputs driving warning LEDs, relay stages, or a controller input through pull-up resistors. The design should include transient protection on the divider outputs and reference pins.
推荐
Industrial Overvoltage Protection
For 24 V industrial control boards, the LM2903QPWRG4Q1 can supervise a divided supply rail using its 2 V to 36 V operating range. Two independent differential channels support separate high and low threshold decisions, and the open-collector outputs can pull down a shared alarm line. Compared with a rail-to-rail comparator, this device accommodates higher signal levels within its specified input operating region. Use a resistive divider, input clamping, and a local ground return that follows the monitored supply reference.
推荐
Fan and Motor Speed Control
The two channels of the LM2903QPWRG4Q1 can monitor tachometer or speed-feedback signals independently from a 12 V or 24 V cooling system. One output can act as a fault signal while the other provides a speed threshold indication, and the 1.3 microsecond propagation delay supports prompt switching decisions. Open-collector outputs simplify interfacing to a controller or MOSFET gate-driver input when paired with a suitable pull-up. Protect the tachometer input against motor-transient coupling and keep the comparator ground close to the signal reference.
推荐
Power Supply Fault Detection
A power-supply protection circuit can use one LM2903QPWRG4Q1 channel to compare a feedback voltage with a reference and the other to detect an abnormal enable or sequencing condition. The 36 V supply capability is useful in 24 V industrial and vehicle auxiliary rails, while the low 0.4 mA supply-current figure reduces overhead in continuously monitored systems. Open-collector outputs allow a wired-OR fault bus and permit the pull-up voltage to be set independently. Select resistor tolerances to control threshold accuracy and account for input offset voltage.
推荐
Sensor Threshold Conditioning
The LM2903QPWRG4Q1 can convert a ratiometric sensor signal into a digital threshold event when the sensor output is centered around a bias reference. Both channels are independent, allowing one to implement a high limit and the other a low limit. Its differential inputs help reject common-mode noise when the sensing pair is referenced to the same return path. Because the output is open collector, the conditioned event can drive a pull-up-based logic input or participate in a wired-AND network while keeping the interface voltage flexible.
推荐
Window Limit and Safety Monitor
Two LM2903QPWRG4Q1 channels can define an upper and lower voltage window, with each open-collector output pulling a shared status line low when its own limit is violated. This arrangement is useful for monitoring intermediate rails in control systems, battery packs, and high-voltage industrial equipment. The AEC-Q100 qualification, extended temperature coverage, and 36 V maximum supply separate it from general-purpose comparators in automotive designs. Use matched divider networks, verify input common-mode limits, and include hysteresis to prevent chatter near each threshold.
推荐
推荐产品汇总
工程参考数据： LM2903QPWRG4Q1 ——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 | LM2903QPWRQ1 | LM2903DRG4 | LM2903M/NOPB | LM2903PWRG3 | LM2903PT |
|---|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | International Rectifier | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | 8-TSSOP (PW) | 8-TSSOP (PW) | 8-TSSOP (PW) | 8-TSSOP (PW) | 8-TSSOP (PW) | 8-TSSOP (PW) |
| Number of Channels | 2 | 2 | 2 | 2 | 2 | 2 |
| Output Type | Open-collector | Open-collector | Open-collector | Open-collector | Open-collector | Open-collector |
关键差异点
- Automotive qualification with high-voltage capability （对比 LM2903DRG4)
- Near-identical pin and functional architecture （对比 LM2903QPWRQ1)
- Wide operating supply for 24V systems （对比 LM2903M/NOPB)
设计说明
The open-collector outputs require an external pull-up resistor on every output that must reach a valid high state. Confirm that the pull-up voltage remains within the receiving device's input limits, that the comparator can sink the pull-up current plus any external load, and that the resulting RC rise time meets the receiver's setup requirement. A missing or incorrectly sized pull-up can leave the output state undefined or produce excessive switching noise.
Route the two comparator inputs as a compact differential pair and connect the IC ground directly to the quiet analog ground reference. Keep switching-node copper, relay contacts, and high-current return paths away from the input pins. Place the threshold divider and any input protection components close to the comparator, and use a short, direct ground connection to minimize comparison errors caused by ground offset.
The specified 36 V maximum supply voltage is an absolute operating limit, not a recommended continuous rail. Automotive and industrial transients can exceed nominal battery voltage, so use suitable input protection, filtering, or a regulator where the rail can overshoot. Verify the absolute maximum ratings, input common-mode range, and temperature-dependent limits in the manufacturer datasheet before applying the device directly to an unprotected supply.
Add hysteresis when the input signal crosses the threshold slowly or contains noise. Otherwise, small offset-voltage and propagation-delay differences can cause output chatter near the switching point. A positive-feedback resistor can establish hysteresis, but its value must preserve the input common-mode range and avoid excessive loading on the sensing node.
合规信息
Texas Instruments identifies LM2903-Q1 as AEC-Q100 Grade 0 and Grade 1 qualified. RoHS-compliant and lead-free status are indicated in the component comparison listing; other compliance attributes are not confirmed.
