LM393ADRG4 - Dual Open-Collector Comparator | Texas Instruments
料号： LM393ADRG4 ✓ 量产中LM393ADRG4 概述
A comparator is an analog integrated circuit that evaluates one voltage against another and changes its output state when the difference crosses a defined threshold. The LM393 family belongs to the broader hierarchy of differential comparator, analog comparator, signal-conditioning IC, and semiconductor categories. Unlike an operational amplifier used primarily for closed-loop amplification, a comparator is optimized for fast, decisive digital signaling and commonly interfaces analog sensing circuits with logic-level systems.
Key features include two independent channels, a wide 2 V to 36 V operating range, open-collector outputs, and a 2 mV offset specification that helps distinguish small differential signals. The open-collector architecture permits the output to be pulled up to a suitable logic voltage, adds output-stage flexibility, and can support wired-AND behavior when multiple comparator outputs share a pull-up resistor. The listed response time of 300 ns suits applications that require a defined switching transition without using a very high-speed logic device.
The LM393ADRG4 is identified as an industrial-grade precision dual differential comparator. Its SOIC package provides a practical surface-mount footprint for PCB assembly, while the broad supply range accommodates 5 V, 12 V, 15 V, and 24 V system rails when component voltage ratings are considered. Because the outputs are open collectors, every application must include an appropriate pull-up resistor or other pull-up arrangement to obtain a valid high output level.
Typical applications include overvoltage and undervoltage monitoring, sensor threshold detection, industrial control interfaces, motor or actuator protection, window-comparison functions, and conversion of analog sensor conditions into logic-compatible events. The two independent channels can monitor separate thresholds or operate as complementary comparators. Designers should also account for input common-mode limits, output pull-up voltage, supply decoupling, and any pull-up current when fan-out or fault conditions are important.
For reliable layouts, place the bypass capacitor close to the supply and ground pins, keep comparator input traces short, and avoid routing them beside high-current switching paths. A pull-up resistor near the output improves rise time, but its value must balance speed, power, and the current sourced by the open-collector transistor. The input network should use stable reference sources and include protection when external wiring exposes the pins to transients.
This page combines the manufacturer product identity, exact orderable package information, structured technical specifications, supported use cases, and drop-in replacement analysis. It is designed to help engineers confirm electrical suitability, package compatibility, and application fit before integrating the LM393ADRG4 into a new or existing PCB design.
直接替换替代料： LM393ADRG4 ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
LM393BDR
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
LM393LVDR
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
LM293ADRE4
✅ 直接替换📋 参考替代料（不在目录中）
LM293ADT
✅ 直接替换📋 参考替代料（不在目录中）
LM393ADRG4 最大额定值与电气特性
| Comparator Type | General-purpose dual differential comparator |
| Number of Comparator Channels | 2 units |
| Supply Voltage Range | 2 V to 36 V |
| Dual-Supply Voltage Range | +/-1 V to +/-18 V |
| Input Offset Voltage | 2 mV |
| Response Time | 300 ns |
| 输出类型 | Open-collector |
| Compatible Output Logic | CMOS, MOS, open-collector, or TTL |
| 工作温度范围 | 0 C to 70 C |
| Temperature Grade | Industrial grade |
| 封装 | 8-SOIC (D), 3.90 mm width |
| 引脚数 | 8 pins |
| 安装类型 | Surface mount |
| Packaging Form | Tape and reel |
| Lead Time | Immediate shipment indicated |
LM393ADRG4 8-soic (d), 3.90 mm width 引脚配置指南
LM393ADRG4（8-soic (d), 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： LM393ADRG4.
请参阅 数据手册 以查看完整引脚配置。
典型应用
LM393ADRG4 适用于 6 应用s: Industrial Overvoltage Monitoring, Sensor Threshold Conditioning, DC Power-Supply Window Detection, Motor and Actuator Protection, Battery Charge-State Detection, Industrial Level and Limit Detection.
Industrial Overvoltage Monitoring
The LM393ADRG4 is suitable for monitoring a 24 V industrial supply against an upper reference. Its 2 V to 36 V supply range and 300 ns response time allow a comparator channel to detect an overvoltage condition rapidly and produce an open-collector fault signal. A pull-up resistor converts the open-collector output into a logic-high fault indication. Designers should also implement a lower threshold using the second channel if the application requires a complete supply window. The principal trade-off is the 0 C to 70 C operating range, which limits use in extended-temperature industrial environments without a suitably rated alternative.
推荐
Sensor Threshold Conditioning
The LM393ADRG4 can convert a slowly varying sensor signal into a logic-compatible event when the signal crosses a defined reference. Its 2 mV input offset voltage supports comparisons of small differential signals, while the two independent channels can monitor two sensors or upper and lower limits. The open-collector output provides flexibility to choose the pull-up voltage, but every output requires an external resistor. Keep the reference source low impedance and the input traces short to minimize offset errors. The 300 ns response is more than adequate for common temperature, light, and level sensing where nanosecond-level timing is unnecessary.
推荐
DC Power-Supply Window Detection
The LM393ADRG4 can implement upper and lower rail checks in a power-supply monitoring circuit. One channel compares the monitored rail with an upper threshold, and the second compares it with a lower threshold, creating a valid-window output state. Its broad 2 V to 36 V operating range accommodates many common supply rails, and its 300 ns response time provides quick fault signaling. Open-collector outputs allow wired logic with suitable pull-ups. Because the comparator does not regulate power, a separate regulator or supervisor remains necessary for controlled power-off behavior when the application requires active shutdown rather than indication alone.
推荐
Motor and Actuator Protection
The LM393ADRG4 can detect excessive voltage or current-sensor thresholds in industrial motor and actuator protection circuits. Its 300 ns response helps minimize delay between threshold crossing and the protective control signal, while two channels can monitor independent variables. The open-collector output can be pulled up to the logic rail used by a gate driver or controller. Protection paths must account for electrical noise, transient events, and the slow 0 C to 70 C temperature rating. For equipment operating outside that range, select an extended-temperature device and verify its output and common-mode specifications before using it in the same protection architecture.
推荐
Battery Charge-State Detection
The LM393ADRG4 can compare a divided battery voltage against fixed reference levels to identify charge, discharge, or overvoltage states. Its two independent comparator channels support upper and lower detection points, and the wide 2 V to 36 V supply range accommodates low-voltage systems with a regulator. The open-collector outputs permit pull-ups to a suitable logic voltage and can be combined for a system-level state indication. Because the comparator only reports threshold crossings, the design still needs a charger, balancing function, or load switch. Use short input-divider traces and stable references to avoid false transitions during battery transitions.
推荐
Industrial Level and Limit Detection
The LM393ADRG4 can compare a level-derived analog voltage with upper and lower setpoints in tanks, pumps, and material-level equipment. The dual-channel architecture permits separate high-level and low-level alarms, while the 2 mV input offset helps resolve small threshold margins around a suitable reference. Its open-collector output can drive a relay driver, indicator, or controller input through a pull-up. Place input and reference components away from motor-switching nodes, and bypass the supply locally to prevent false comparator transitions. The 0 C to 70 C rating suits controlled indoor equipment but requires a different grade for exposed or high-temperature installations.
推荐
推荐产品汇总
工程参考数据： LM393ADRG4 ——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 | LM393BDR | LM393LVDR | LM293ADRE4 | LM293ADT |
|---|---|---|---|---|---|
| Package | 8-SOIC (D) | 8-SOIC (D) | 8-SOIC (D) | 8-SOIC (D) | 8-SOIC (D) |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | STMicroelectronics |
| Comparator Channels | 2 units | 2 units | 2 units | 2 units | 2 units |
| Comparator Type | General-purpose dual differential comparator | Dual differential comparator | Dual differential comparator | Dual differential comparator | Dual differential comparator |
关键差异点
- Standard industrial-grade LM393A configuration with a defined 0 C to 70 C range （对比 LM293ADRE4)
- Two independent comparator channels in a standard 8-SOIC footprint （对比 LM293ADT)
- Specified 300 ns response and 2 mV offset for general threshold detection （对比 LM393BDR)
设计说明
Connect an external pull-up resistor to each open-collector output and choose the pull-up supply within the device's permitted output-voltage range. A smaller resistance produces a faster rising edge but increases current when the output transistor is on; a larger resistance reduces power but can slow edge rates and increase susceptibility to capacitance. Place each pull-up close to the corresponding output pin so that PCB trace capacitance does not degrade switching behavior.
Place the supply bypass capacitor immediately between the supply and ground pins, and route those connections with minimal loop area. Keep the non-inverting and inverting inputs away from switching-node copper, relays, transformers, and high-current return paths. A solid ground plane is helpful, but sensitive reference and input traces should still be kept short and isolated from sources of transient current that could inject differential noise into the 2 mV offset-sensitive comparison node.
Do not treat the open-collector output as a push-pull logic output, and do not omit the pull-up. Also verify that the input voltages remain inside the comparator's common-mode range for the selected supply voltage; a wide 2 V to 36 V supply rating does not permit every input voltage at every supply level. In dual-supply systems, maintain the permitted total rail separation and connect the ground reference correctly to the circuit being compared.
合规信息
The product information identifies the LM393ADRG4 as an industrial-grade comparator but does not establish the requested compliance declarations.
