LM339DRG3 - 4-Channel Comparator | Texas Instruments
料号： LM339DRG3 ✓ 量产中LM339DRG3 概述
A comparator is an analog integrated circuit that compares two input voltages and changes its output when the non-inverting input rises above the inverting input. The LM339 family belongs to the hierarchy of comparator ICs, analog signal-processing ICs, and general-purpose semiconductors. Its four open-collector outputs can pull down external loads and interface with TTL, MOS, and CMOS logic when suitable pull-up circuitry is used.
The LM339DRG3 provides four independent comparator channels in one 14-pin SOIC package. Its single-supply range extends to 36 V, while operation from dual supplies is also possible. The common-mode input range includes ground, an important feature for monitoring signals referenced to the same ground as the comparator. Open-collector outputs add design flexibility but require an external pull-up resistor when a logic-high output is required.
The device is designed for general-purpose applications where the input signals remain within the comparator's supported common-mode and differential voltage limits. The 14-SOIC package provides a practical transition from through-hole designs to surface-mount assemblies while retaining the familiar LM339 channel arrangement. Each comparator is electrically independent, allowing one package to implement four separate decisions or thresholds.
Typical uses include industrial sensor-interface circuits, overvoltage and undervoltage detection, temperature-control thresholds, relay or solenoid drive logic, window comparators, and low-frequency control loops. The open-collector stage is especially useful when driving a transistor, indicator, relay interface, or pull-up-connected logic family rather than driving a high-current load directly.
When laying out a design, verify that every differential input pair remains within its allowed voltage range and that input nodes do not exceed the supply and ground limits. Place pull-up resistors close to the open-collector outputs, maintain the required input common-mode range, and use a stable bypass capacitor near the supply pin. The open-collector architecture can pull a rail down but cannot source current, so external drive circuitry may be required.
This page combines the manufacturer’s LM339 electrical and family information with practical pinout, comparison, sourcing, and layout guidance. It also distinguishes verified drop-in options from package-only substitutions, helping engineers select a replacement while accounting for supply voltage, output topology, operating grade, and lifecycle requirements.
直接替换替代料： LM339DRG3 ——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： LM339DRG3 （相同外形与封装尺寸） ——差异在于 Logic Compatibility, Output Type.
LM339ADR
✅ 直接替换联系询价
查看数据手册 →LM339M/NOPB
✅ 直接替换📋 参考替代料（不在目录中）
LM339BDR
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
LM339DRG3 最大额定值与电气特性
| Comparator Type | Differential, general purpose |
| Number of Channels | 4 channels |
| 输出类型 | Open collector |
| Single-Supply Voltage Range | 2 V to 36 V |
| Dual-Supply Voltage Range | Up to ±18 V |
| Minimum Supply Voltage | 2 V |
| Maximum Supply Voltage | 36 V |
| Differential Input Voltage Range | Up to ±38 V |
| Common-Mode Input Voltage | Includes ground |
| Propagation Delay | 1.3 us |
| Logic Compatibility | TTL, MOS, and CMOS |
| Package Type | 14-SOIC |
| Package Width | 3.90 mm |
| Package Length | 0.154 in |
| 安装方式 | Surface mount |
| Shipping Format | Tape and reel |
LM339DRG3 引脚配置
| 引脚 1 | OUT1 — Comparator 1 open-collector output |
| 引脚 2 | IN1- — Comparator 1 inverting input |
| 引脚 3 | IN1+ — Comparator 1 non-inverting input |
| 引脚 4 | GND — Ground connection |
| 引脚 5 | IN2+ — Comparator 2 non-inverting input |
| 引脚 6 | IN2- — Comparator 2 inverting input |
| 引脚 7 | OUT2 — Comparator 2 open-collector output |
| 引脚 8 | OUT3 — Comparator 3 open-collector output |
| 引脚 9 | IN3- — Comparator 3 inverting input |
| 引脚 10 | IN3+ — Comparator 3 non-inverting input |
| 引脚 11 | VCC — Positive supply connection |
| 引脚 12 | IN4+ — Comparator 4 non-inverting input |
| 引脚 13 | IN4- — Comparator 4 inverting input |
| 引脚 14 | OUT4 — Comparator 4 open-collector output |
典型应用
LM339DRG3 适用于 6 应用s: Industrial Sensor Threshold Detection, Overvoltage and Undervoltage Protection, Temperature Control and Limit Monitoring, Relay and Solenoid Interface Logic, Battery and Power-System Supervision, Analog-to-Digital Front-End Conditioning.
Industrial Sensor Threshold Detection
The LM339DRG3 fits industrial sensor-interface circuits that compare a slowly varying sensor signal against an adjustable reference. Its four independent differential channels can monitor four thresholds within one 14-SOIC package, while the common-mode input range including ground supports sensors referenced to the same ground as the comparator. A pull-up resistor converts each open-collector output into a usable logic signal. Designers should verify that the sensor voltage remains inside the differential input range of ±38 V and that transients are clamped before reaching the input pins.
推荐
Overvoltage and Undervoltage Protection
The LM339DRG3 can implement independent upper and lower supply-threshold checks where the monitored rail may be much higher than the comparator logic supply. Its 2 V to 36 V operating range supports single-rail sensing, and the differential input capability extends to ±38 V. Four channels permit a compact window-comparator arrangement with open-collector outputs for latch, reset, or interrupt signaling. The input network must keep the comparator within its absolute and common-mode limits, while a suitable pull-up establishes a valid logic-high fault indication.
推荐
Temperature Control and Limit Monitoring
The LM339DRG3 is appropriate for switching a heater, fan, or cooling stage around a temperature threshold derived from a sensor and reference network. Its four independent channels can provide over-temperature, under-temperature, and additional setpoint functions without requiring four separate packages. Because the outputs are open collector, an N-channel MOSFET or logic gate can serve as the higher-current driver. The design must account for input offset near the switching threshold, sensor slope, hysteresis, and propagation delay of approximately 1.3 us when calculating the control behavior.
推荐
Relay and Solenoid Interface Logic
The LM339DRG3 can turn a low-current decision signal into an open-collector output suitable for driving a transistor, relay driver, or solenoid-control stage. Its open-collector architecture provides galvanic isolation from the logic output while remaining compatible with TTL, MOS, and CMOS pull-up networks. A comparator channel can evaluate the voltage across a shunt, current-sense output, or supply rail and disable the load when the limit is exceeded. Confirm that the external transistor or driver handles the load current and that flyback protection is included for inductive loads.
推荐
Battery and Power-System Supervision
The LM339DRG3 is useful in battery-powered and industrial power systems for comparing a divided supply or battery voltage against fixed or adjustable reference thresholds. The device supports single-supply operation from 2 V to 36 V, and its common-mode input range includes ground for rail-oriented sensing. Four channels can supervise charge, discharge, auxiliary rails, or combine signals through external resistor networks. Because open-collector outputs float when inactive, use defined pull-ups and avoid relying on the output for a high voltage without checking the exact pull-up network and input-current behavior.
推荐
Analog-to-Digital Front-End Conditioning
The LM339DRG3 can provide a simple discrete decision stage ahead of an ADC, converting an analog sensor or amplifier output into a digital over-range or threshold event. The ADC continues to resolve the analog value while the comparator handles a fast limit indication, reducing the need for complex firmware comparisons in time-critical paths. The four channels support independent reference comparisons, and the 1.3 us propagation delay is suitable for ordinary control and status signaling. Layout should keep comparator inputs short, separate them from switching nodes, and provide local supply bypassing.
推荐
推荐产品汇总
工程参考数据： LM339DRG3 ——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 | LM339ADR | LM339M/NOPB | LM339BDR | LM339D | LM339DG |
|---|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | onsemi | onsemi |
| Package | 14-SOIC | 14-SOIC - same | 14-SOIC - same | 14-SOIC - same | 14-SOIC - same | 14-SOIC - same |
| Number of Comparators | 4 | 4 | 4 | 4 | 4 | 4 |
| Output Type | Open collector | Open collector | Open collector | Open collector | Open collector | Open collector |
关键差异点
- Four independent channels in one surface-mount package （对比 LM2904P3)
- Direct same-manufacturer replacement path （对比 LM339ADR)
- Potentially improved precision in the B-version family （对比 LM339BDR)
- Cross-brand sourcing option with matching package and channel count （对比 LM339D)
设计说明
Place the pull-up resistor for each open-collector output close to the corresponding output pin and the receiving logic input. Keep comparator input traces short, route them away from switching nodes and inductor connections, and provide a local supply bypass capacitor between VCC and GND. The four channels are independent, but sharing the same supply means excessive input or output loading can disturb the common supply rail.
Treat the inverting and non-inverting inputs as high-impedance analog nodes. Avoid long parallel runs next to digital clock or power-converter traces, and use a compact ground-return path. Input filtering can reduce false threshold transitions, but capacitor and resistor values must be checked against the 1.3 us propagation delay and the required response time of the control loop.
The open-collector output requires a defined pull-up supply and can source no current when inactive. Select the pull-up voltage and resistor so the output current remains within the device rating and the receiving logic receives a valid high level. When driving a relay, solenoid, or lamp, use a suitable transistor or driver and add the required flyback protection rather than increasing the comparator output load.
Verify that each input pair remains within the ±38 V differential range and that no input exceeds the supply limitations. The common-mode range includes ground, but it does not imply that every signal from ground to VCC is safe for all operating conditions. Confirm the exact LM339 suffix temperature grade and use the manufacturer pin-description table before applying power.
合规信息
The manufacturer product information identifies the LM339 as a general-purpose analog comparator but does not establish the requested environmental, material, or automotive qualification declarations.