LM339ADG4 - Quad Differential Comparator | Texas Instruments
料号： LM339ADG4 ✓ 量产中LM339ADG4 概述
A differential comparator is an analog integrated circuit that evaluates the relationship between two input voltages rather than operating as a conventional high-gain amplifier. If the non-inverting input is higher than the inverting input, the associated output transistor turns on; reversing the inputs changes the output state. The LM339 belongs to the comparator IC, analog comparator, and general-purpose semiconductor hierarchy used for threshold detection, level sensing, waveform conversion, and control decisions.
The four open-collector outputs can sink current but require an external pull-up resistor to establish a high output voltage. This arrangement supports wired logic, relay or lamp drive, and interfacing with TTL, MOS, and CMOS circuits. The manufacturer identifies the device as a standard general-purpose comparator, while the listed 300 ns response time and 0.8 mA typical supply-current drain make it appropriate for circuits where propagation delay and supply demand are more important than nanosecond-class response.
The wide 2 V to 36 V supply range supports industrial control, automotive-style interface circuits, power-supply monitoring, and legacy logic designs. A differential input range equal to the maximum-rated supply voltage allows substantial input swing around ground when suitable supply arrangements are used. The open-collector architecture is particularly useful when multiple comparator channels must share a pull-up or when the output must drive a device requiring more current than the comparator can source directly.
Designers should pay close attention to common-mode input limits, output pull-up values, and the distinction between single- and dual-supply operation. Because the outputs are open collector, leaving them without a pull-up can produce an undefined logic level. Inputs and outputs should also be checked against the electrical limits in the manufacturer datasheet when operating near the 36 V maximum supply.
This page brings together the verified LM339ADG4 specifications, package details, application guidance, same-footprint alternatives, and practical selection considerations. It is intended to help engineers confirm compatibility quickly while retaining the datasheet as the authoritative source for absolute maximum ratings, test conditions, and detailed timing behavior.
直接替换替代料： LM339ADG4 ——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： LM339ADG4 （相同外形与封装尺寸） ——差异在于 Package, Comparator Type, Logic Compatibility, Output Type, Number of Channels.
LM339ADRG4
✅ 直接替换联系询价
查看数据手册 →LM339DR2G
✅ 直接替换联系询价
查看数据手册 →LM339DR
✅ 直接替换联系询价
查看数据手册 →LM339ADG4 最大额定值与电气特性
| Comparator Type | General-purpose differential comparator |
| Number of Channels | 4 channels |
| Supply Voltage Range | 2 V to 36 V |
| Propagation Delay | 300 ns |
| 输出类型 | Open-collector |
| Typical Supply-Current Drain | 0.8 mA |
| Differential Input Voltage Range | Equal to maximum-rated supply voltage, up to ±38 V |
| Common-Mode Input Voltage Range | Includes ground |
| Operating Supply Configurations | Single supply or dual supplies |
| Logic Compatibility | TTL, MOS, and CMOS output compatible |
| 封装 | 14-SOIC, 3.90 mm width |
| 安装类型 | Surface mount |
| 引脚数量 | 14 pins |
LM339ADG4 14-soic, 3.90 mm width 引脚配置指南
LM339ADG4（14-soic, 3.90 mm width 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： LM339ADG4.
请参阅 数据手册 以查看完整引脚配置。
典型应用
LM339ADG4 适用于 6 应用s: Industrial Threshold Detection, Power-Supply Monitoring, Window and Level Comparators, Relay and Lamp Drive, Sensor Signal Conditioning, Battery and Automotive Interface Logic.
Industrial Threshold Detection
The LM339ADG4 fits industrial threshold-detection circuits because four independent channels can compare sensor signals against separate reference voltages within one 14-SOIC device. Its 2 V to 36 V supply range supports common industrial rails, while the 300 ns propagation delay provides rapid switching for relay, interlock, and alarm decisions. Each open-collector output can directly sink current into a suitable load or pull-up network. The circuit designer should choose resistor values for the pull-up and input network based on leakage, noise, and the required logic level. Input common-mode limits and the operating-temperature grade must also remain inside the manufacturer specifications for the installed enclosure.
推荐
Power-Supply Monitoring
The LM339ADG4 can monitor multiple power rails by comparing divided feedback voltages from each rail against a common reference. Its 2 V to 36 V operating range accommodates industrial and automotive-style supply buses, and the 300 ns response time allows a protection signal to change quickly when a monitored level crosses a threshold. Because all four comparators share supply pins, their reference and input networks should be scaled to avoid unwanted common-mode excursions. The open-collector outputs can pull down a system fault line or drive an external transistor when a pull-up resistor is added. Final thresholds must include resistor tolerance and the comparator's input-offset characteristics.
推荐
Window and Level Comparators
The LM339ADG4 is suitable for upper and lower window comparisons because each channel provides an independent differential input pair and an open-collector decision output. A monitored voltage can be compared with upper and lower thresholds to establish whether it remains inside an allowed band. Its 300 ns listed response time supports fast threshold transitions, while the 14-SOIC package consolidates four channels into a compact circuit. Use suitable pull-up resistors on the outputs and account for input-offset voltage when the thresholds are closely spaced. For noisy industrial signals, add filtering at the inputs without adding enough delay to undermine the intended protection response.
推荐
Relay and Lamp Drive
The LM339ADG4 can form the decision stage of relay, lamp, and solenoid-driver circuits because its open-collector output sinks current when a comparison condition is met. The 2 V to 36 V supply range supports a variety of control systems, and four channels allow several loads to be sequenced or independently switched. An external relay driver or power transistor is normally required because the open-collector output is not a general-purpose source. The pull-up resistor, output current, load flyback path, and comparator common-mode limits must be designed together. Keep inductive switching energy away from input nodes to prevent false decisions or output reset events.
推荐
Sensor Signal Conditioning
The LM339ADG4 can convert a conditioned sensor signal into a clean logic decision for a controller or data-acquisition system. A sensor output is first scaled into the comparator's input range, then compared with a stable threshold; the open-collector result can drive a pull-up or wired interface. The 300 ns propagation delay is suitable for many sensing loops, while the four-channel arrangement supports temperature, pressure, light, or level inputs within one package. Use the manufacturer common-mode range as a hard design boundary, especially around ground. Add hysteresis or filtering when the monitored signal crosses its threshold slowly and noise could cause repeated output transitions.
推荐
Battery and Automotive Interface Logic
The LM339ADG4 is useful for battery-powered and automotive interface logic where a wide supply range and open-collector outputs simplify system integration. Four channels can evaluate charge thresholds, battery-present signals, reverse-polarity indications, or discrete sensor states, with a 300 ns response time supporting quick control decisions. Its differential structure helps reject signals referenced to a common bias, while the open-collector output can interface with a pull-up or drive an external transistor. Automotive production designs should verify temperature grade, transient immunity, input limits, and any AEC-Q100 qualification before deployment rather than relying only on the general-purpose family description.
推荐
推荐产品汇总
工程参考数据： LM339ADG4 ——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 | LM339ADRG4 | LM339DR2G | LM339DR | LM339DG | LM2904PW |
|---|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | 14-SOIC | 14-SOIC - same package | 14-SOIC - same package | 14-SOIC - same package | 14-SOIC - same package | 14-SOIC - same package |
关键差异点
- Four general-purpose channels in one 14-SOIC package （对比 LM2904PW)
- Lower minimum single-supply rating in the identified comparison （对比 LM339DR2G)
- Direct same-family ordering option with the same footprint （对比 LM339ADRG4)
设计说明
Fit a pull-up resistor on every open-collector output that must resolve to a valid high state. The output transistor sinks current but does not source the supply voltage. Select the resistor against the load's leakage and sink-current requirements, and verify that the resulting rise time is acceptable for the connected logic. Leaving the outputs without pull-ups is a frequent cause of undefined system states.
Keep comparator input and output routing away from noisy switching nodes and the inductive return path of relays, motors, or lamps. Place any threshold-setting or filtering components close to the corresponding inputs, and route each channel as a compact loop over the 14-SOIC. The open-collector output may switch quickly, so minimizing loop area reduces susceptibility to coupling and false comparator transitions.
Check the actual supply and input levels against the manufacturer limits before enabling the circuit. The LM339 family supports a wide 2 V to 36 V operating range, but the permitted common-mode range is a separate constraint. A supply within its operating range does not automatically make every input voltage legal. Include resistor tolerance, input offset, and startup behavior when defining protection or switching thresholds.
Do not substitute an LM339-family suffix solely because it uses a 14-SOIC footprint. LM339ADG4, LM339DR2G, LM339DR, and LM339DG can differ by ordering suffix, supply limits, temperature grade, or qualification. Compare the electrical-characteristics table and absolute-maximum-rating table for the exact proposed part. For LM2904PW, also confirm common-mode range, offset voltage, output behavior, and environmental ratings.
合规信息
Compliance status requires confirmation from the current Texas Instruments product documentation or the manufacturer's declarations.