LMV331QDBVRQ1 - AEC-Q100 Single Comparator, Open-Collector, SOT-23-5 | TI
料号： LMV331QDBVRQ1 ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $0.78 | $0.78 |
| 10 | $0.66 | $6.60 |
| 100 | $0.49 | $49.00 |
| 500 | $0.38 | $190.00 |
| 1,000 | $0.32 | $320.00 |
| 3,000 | $0.27 | $810.00 |
LMV331QDBVRQ1 概述
What is a comparator? A comparator is an analog integrated circuit that compares two input voltages and drives its output to a logic level indicating which input is larger. The LMV331-Q1 belongs to the analog comparator family within the broader signal-conditioning and power-management hierarchy, occupying the same role in the IC taxonomy as op-amps, references, and timers. Comparators are essential building blocks in voltage monitoring, threshold detection, zero-crossing detectors, and oscillator/waveform-shaping circuits.
Key specifications of the LMV331QDBVRQ1 include an input common-mode voltage range that includes ground, low output saturation voltage, push-pull compatible open-collector output stage, and an operating temperature range of -40 °C to +125 °C (automotive Grade 1). The part is offered in the SC-74A / SOT-753 / SOT-23-5 footprint, making it one of the smallest qualified comparators available for space-constrained automotive modules.
Internally, the LMV331 uses a PNP input stage and a low-voltage CMOS-compatible architecture that allows operation down to 2.7 V while maintaining a ground-referenced input range. The open-collector output requires an external pull-up resistor, which gives designers the freedom to level-shift the output to a voltage higher than the supply rail (for example, driving a 3.3 V logic output from a 5 V supply comparator) or to combine multiple comparator outputs on a single bus.
Typical applications include automotive body controllers, battery management threshold detectors, sensor signal conditioning, window comparators, and oscillator circuits. The wide supply range and low quiescent current also suit portable consumer products, IoT battery-powered nodes, and industrial control systems requiring automotive-grade reliability.
When designing with this part, choose the pull-up resistor value to balance switching speed and power dissipation. Avoid placing large capacitive loads directly on the open-collector output; use a small series resistor if capacitive loading cannot be avoided to limit inrush current during saturation-to-release transitions.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet, helping engineers source and apply the LMV331QDBVRQ1 efficiently.
直接替换替代料： LMV331QDBVRQ1 ——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： LMV331QDBVRQ1 （相同外形与封装尺寸） ——差异在于 Automotive Qualification, Input Common-Mode Range, MSL Level, Operating Temperature Range, Output Type.
快速对比工具——选择替代料号进行并排对比：
LMV331IDBVRG4
✅ 直接替换📋 参考替代料（不在目录中）
LMV331M5
✅ 直接替换📋 参考替代料（不在目录中）
LMV331M5X
✅ 直接替换📋 参考替代料（不在目录中）
LMV331IDCKR
✅ 直接替换📋 参考替代料（不在目录中）
LM2903QDRQ1
✅ 直接替换📋 参考替代料（不在目录中）
LMV331QDBVRQ1 最大额定值与电气特性
| Comparator Type | General Purpose, Low Voltage |
| Number of Comparators | 1 |
| 输出类型 | Open-Collector |
| Supply Voltage Range | 2.7 V to 5.5 V |
| Quiescent Current (typ) | 60 µA |
| Propagation Delay (typ) | 600 ns |
| Input Common-Mode Range | Includes ground (rail-to-rail negative) |
| Output Saturation Voltage | Low (open-collector) |
| 工作温度范围 | -40 °C to +125 °C (Automotive Grade 1) |
| Automotive Qualification | AEC-Q100 Qualified |
| 封装 / 外壳 | SC-74A, SOT-753, SOT-23-5 |
| 引脚数 | 5 |
| 安装类型 | Surface Mount |
| Packaging | Tape & Reel (TR) |
| MSL 等级 | 1 (per PartGenie compliance notes) |
| RoHS 状态 | ROHS3 Compliant |
LMV331QDBVRQ1 引脚配置
| 引脚 1 | OUT — Open-collector comparator output |
| 引脚 2 | GND — Ground (0 V supply reference) |
| 引脚 3 | IN+ — Non-inverting input |
| 引脚 4 | IN- — Inverting input |
| 引脚 5 | VCC — Positive supply (2.7 V to 5.5 V) |
典型应用
LMV331QDBVRQ1 适用于 6 应用s: Automotive Battery Voltage Monitor, Portable Consumer Threshold Detector, Industrial Sensor Signal Conditioning, Relaxation Oscillator / Square-Wave Generator, Automotive Window Comparator (Single-Chip Alternative), Power Supply Sequencing Supervisor.
Automotive Battery Voltage Monitor
The LMV331QDBVRQ1 is an excellent fit for automotive battery monitoring thanks to its 2.7 V to 5.5 V supply range (compatible with 3.3 V and 5 V microcontrollers) and AEC-Q100 Grade 1 qualification supporting -40 °C to +125 °C operation. With 60 µA quiescent current, it draws negligible current from the battery when the vehicle is parked. The 600 ns propagation delay is fast enough to detect over-voltage and under-voltage events before downstream regulators are stressed. Connect one input to a divided-down battery voltage and the other to a reference; the open-collector output pulls low to flag a fault and can directly drive an MCU interrupt pin. The ground-sensing input common-mode range allows direct sensing of negative transients relative to chassis ground. Compared to the legacy LM393, the LMV331QDBVRQ1 saves 85% of supply current while occupying half the board area.
推荐
Portable Consumer Threshold Detector
In portable consumer products such as wearables and handheld meters, the LMV331QDBVRQ1 provides a compact, low-power voltage threshold detector that extends battery life. Its 60 µA quiescent current is dwarfed by the µA-level sleep currents of modern Bluetooth SoCs, allowing always-on monitoring without a separate enable circuit. The 2.7 V to 5.5 V supply range directly supports single-cell Li-ion battery stacks (3.0 V to 4.2 V). Designers can wire the open-collector output to a wake-up GPIO of the host MCU; the comparator will assert a low logic level the moment the input crosses the reference. The SOT-23-5 footprint occupies only 8 mm² of board area, making it ideal for densely packed consumer electronics. Compared to discrete BJT-based comparators, the LMV331QDBVRQ1 saves PCB area and provides a guaranteed input offset specification.
推荐
Industrial Sensor Signal Conditioning
The LMV331QDBVRQ1 is well-suited to industrial sensor signal conditioning, particularly for limit-switch interfaces, photo-interrupter detectors, and 4-20 mA loop threshold detection. The ground-sensing input allows direct coupling to a sensor that swings to 0 V on one rail, eliminating the level shifter required by some competing comparators. Its 600 ns propagation delay is more than adequate for mechanical-switch debouncing and slow analog signals typical of industrial process control. The AEC-Q100 qualification, while not strictly required for industrial use, provides a margin of reliability for factory-floor environments with temperature and vibration stress. The open-collector output drives 24 V logic via a pull-up to that rail, simplifying interface to legacy PLCs. For multi-channel systems, multiple LMV331QDBVRQ1 outputs can be wire-ORed to a single fault bus.
推荐
Relaxation Oscillator / Square-Wave Generator
The LMV331QDBVRQ1 forms an inexpensive RC relaxation oscillator by feeding the open-collector output back to the non-inverting input through a resistor while the inverting input sees a charging capacitor. With a 10 kΩ resistor and 1 nF capacitor, oscillation frequencies around 50 kHz are achievable. The 60 µA quiescent current means the oscillator itself draws almost no power compared to a 555-timer-based equivalent, suiting battery-powered timing applications. The 2.7 V to 5.5 V supply range allows operation from a single Li-ion cell or USB rail. The SOT-23-5 package keeps the BOM cost and PCB footprint minimal for cost-sensitive applications. For tighter frequency stability, replace the timing capacitor with a ceramic NP0/C0G part and avoid high-leakage electrolytic types.
推荐
Automotive Window Comparator (Single-Chip Alternative)
For a single-rail over-voltage/under-voltage window comparator, two LMV331QDBVRQ1 parts can be used in a minimal-footprint configuration. The first comparator detects an upper threshold while the second detects a lower threshold, with both open-collector outputs wire-ORed to a single MCU interrupt. The AEC-Q100 qualification makes this approach acceptable for safety-relevant body-control modules such as battery management systems. Each LMV331QDBVRQ1 draws only 60 µA, so the entire window comparator adds just 120 µA to the quiescent budget. The 600 ns response time triggers within microseconds of an out-of-window event, fast enough to enable a disconnect FET before downstream electronics are damaged. Compared to a dual comparator in one package, this approach offers layout flexibility and graceful degradation if one channel fails.
推荐
Power Supply Sequencing Supervisor
The LMV331QDBVRQ1 functions as a low-cost power-good supervisor for multi-rail DC-DC converters. Tie one input to a divided-down output rail and the other to a precision reference; the open-collector output signals a fault when the rail drifts out of regulation. The 2.7 V to 5.5 V supply allows the comparator to be powered from the same rail it monitors, or from an always-on auxiliary rail. The 60 µA quiescent current is acceptable for always-on monitoring of standby rails. The 600 ns propagation delay provides a fast PG response that downstream regulators can use to hold reset until the input stabilizes. Compared to dedicated supervisor ICs, this approach allows custom threshold voltages and finer hysteresis control via a single external resistor.
推荐
推荐产品汇总
工程参考数据： LMV331QDBVRQ1 ——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 | LMV331IDBVRG4 | LMV331M5 | LMV331M5X | LMV331IDCKR | LM2903QDRQ1 |
|---|---|---|---|---|---|---|
| Package | SOT-23-5 (DBV) | SOT-23-5 (same) | SOT-23-5 (same) | SOT-23-5 (same) | SOT-23-5 / SC-70-5 (same family) | SOT-23-5 (same family) |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Channels | 1 | 1 | 1 | 1 | 1 | 2 (dual) |
| Supply Range | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2 V to 36 V |
| Quiescent Current (typ) | 60 µA | 60 µA | 60 µA | 60 µA | 60 µA | 0.5 mA |
| Output Type | Open-Collector | Open-Collector | Open-Collector | Open-Collector | Open-Collector | Open-Collector |
| AEC-Q100 Qualified | Yes (Grade 1) | No (industrial) | No | No | No | Yes |
| Operating Temperature | -40 °C to +125 °C | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +125 °C |
| Propagation Delay (typ) | 600 ns | 600 ns | 600 ns | 600 ns | 600 ns | 1.3 µs |
关键差异点
- AEC-Q100 Grade 1 automotive qualification （对比 LMV331IDBVRG4)
- 60 µA typical quiescent current, ~85% lower than legacy LM393 （对比 LM2903QDRQ1)
- Single-channel in SOT-23-5 saves 50% board area vs dual packages （对比 LM2903QDRQ1 (dual, SOIC-8))
设计说明
The LMV331QDBVRQ1 has an open-collector output that will float if no pull-up resistor is connected. A common design error is to omit the pull-up, leaving the MCU input in a high-impedance state and producing an indeterminate logic level. Always include a pull-up resistor (typically 10 kΩ to 100 kΩ) tied to VCC or to the desired logic rail. The resistor value trades off switching speed against power dissipation: lower values give faster edges but draw more current through the output transistor when asserted low.
Keep the input traces short and shielded from switching noise, especially in automotive environments where the PCB is exposed to injector and ignition transients. Place the bypass capacitor (typically 100 nF X7R) as close as possible to the VCC pin (pin 5). The SOT-23-5 land pattern should follow the IPC-7351 nominal footprint with at least 0.2 mm trace-to-pad clearance for manufacturability. For multi-channel systems with multiple comparators, route the open-collector outputs in a star topology to the pull-up resistor to avoid ground-bounce coupling.
Add hysteresis to prevent output chattering when the input signal has slow rise/fall times or noise near the threshold. A simple positive-feedback resistor (typically 100 kΩ to 1 MΩ) from the output back to the non-inverting input creates a few millivolts of hysteresis. The exact value depends on the source impedance of the input signal; for high-impedance sources, use a larger resistor to avoid loading the input. For applications requiring precise thresholds, consider using a precision reference such as the LM4040 instead of a resistor divider from VCC, which has poor power-supply rejection.
Estimated: At maximum supply of 5.5 V with 60 µA quiescent current, the LMV331QDBVRQ1 dissipates approximately 0.33 mW internally, resulting in negligible junction temperature rise. The SOT-23-5 package has a typical theta_JA of 250-300 °C/W on a 1 oz 2-layer board; even with 1 mA load current through the open-collector output, the dissipation stays well under 10 mW. No thermal management is required for this part under normal operating conditions. This is a key advantage over bipolar comparators that may draw 1-2 mA continuously.
合规信息
ROHS3 Compliant per PartGenie compliance notes; AEC-Q100 qualified per TI product family Q1 designation. REACH, halogen-free, and conflict-mineral status not explicitly stated in verified web data; set to 'unknown'.
