LM393ADRG4 - Dual Open-Collector Comparator | Texas Instruments
MPN： LM393ADRG4 ✓ 啟用中LM393ADRG4 概覽
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.
直接替換替代品，適用於 LM393ADRG4 — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
LM393BDR
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
LM393LVDR
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
LM293ADRE4
✅ 直接替換📋 參考替代品（不在目錄中）
LM293ADT
✅ 直接替換📋 參考替代品（不在目錄中）
LM393ADRG4 最大額定值與電氣特性
| 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 |
| 輸出類型 | Open-collector |
| Compatible Output Logic | CMOS, MOS, open-collector, or TTL |
| 工作溫度範圍 | 0 C to 70 C |
| Temperature Grade | Industrial grade |
| 封裝 | 8-SOIC (D), 3.90 mm width |
| 腳位數 | 8 pins |
| 安裝類型 | Surface mount |
| Packaging Form | Tape and reel |
| Lead Time | Immediate shipment indicated |
LM393ADRG4 8-soic (d), 3.90 mm width 腳位配置指南
LM393ADRG4（8-soic (d), 3.90 mm width 封裝）的腳位配置。 此類比元件具有輸入、輸出與電源腳位。偏移歸零、補償與致能腳位配置請參閱製造商資料表。適用於訊號調理與放大器電路。
無詳細腳位定義資料： LM393ADRG4.
請參閱 資料表 以查看完整腳位配置。
典型應用
LM393ADRG4 適用於 6 應用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.
推薦
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.
推薦
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.
推薦
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.
推薦
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.
推薦
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.
推薦
推薦產品摘要
工程參考資料，適用於 LM393ADRG4 — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | 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 |
主要差異化特點
- Standard industrial-grade LM393A configuration with a defined 0 C to 70 C range (對比LM293ADRE4)
- Two independent comparator channels in a standard 8-SOIC footprint (對比LM293ADT)
- Specified 300 ns response and 2 mV offset for general threshold detection (對比LM393BDR)
設計說明
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.
合規資訊
The product information identifies the LM393ADRG4 as an industrial-grade comparator but does not establish the requested compliance declarations.
