LM393DG - Dual Precision Comparator | onsemi | SOIC-8
MPN： LM393DG ✗ 停產LM393DG 概覽
A voltage comparator is an analog integrated circuit that compares two input voltages and changes its output state when the difference crosses a defined threshold. In the broader semiconductor hierarchy, a comparator belongs to the amplifier and signal-conditioning IC family, where it connects analog sensing functions to digital control, protection, and switching systems. The LM393DG combines two independent comparators in one package, reducing component count and simplifying dual-threshold or dual-channel designs.
Key features include input offset voltage as low as 2.0 mV, single or split supply operation, and output compatibility with CMOS, DTL, ECL, MOS, and TTL logic families. Its open-collector outputs allow wired logic, level translation, or operation with an external pull-up resistor. A 1.3 µs response time supports applications where the comparator must resolve changing input conditions without the delay of a slower monitoring device.
The LM393 series is designed for consumer, automotive, and industrial electronics, including threshold detection, sensor conditioning, window comparison, overvoltage indication, and relay or power-control interfaces. Each channel can operate from a single positive supply or from split supplies when the required input and output reference conditions permit it. Independent channels also allow different thresholds and switching functions within one package.
Common-mode range to ground makes the device useful with low-voltage sensors whose signals remain near the lower supply rail. The output stage is open collector rather than push-pull, so every output requires a pull-up resistor unless it is intentionally wired together. Confirm the pull-up voltage, output sink-current requirements, input common-mode limits, and system grounding before finalizing a design.
For robust layouts, keep input traces short, place bypass capacitance close to the supply pin, and isolate high-current switching nodes from comparator inputs. The SOIC-8 footprint simplifies through-hole assembly and PCB prototyping, while the open-collector outputs require careful pull-up placement to minimize switching noise and propagation delay.
This page combines the LM393DG electrical characteristics, lifecycle status, drop-in replacement options, pinout, comparison data, and practical circuit guidance to support component selection and board-level implementation. It also identifies the operating parameters and sourcing facts that should be checked against the manufacturer datasheet before production release.
直接替換替代品，適用於 LM393DG — 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。
此系列的變體
與下列產品可直接替換的同系列型號： LM393DG （相同外形與佔位） — 差異在於 Package, Response Time, Input Offset Voltage, Common-Mode Input Range, Mounting Type.
LM393DR2G
✅ 直接替換聯絡詢價
查看資料表 →LM393NG
✅ 直接替換聯絡詢價
查看資料表 →LM393M
✅ 直接替換聯絡詢價
查看資料表 →LM393DG 最大額定值與電氣特性
| Comparator Type | Precision voltage comparator |
| Number of Comparators | 2 independent channels |
| Supply Voltage Range | 2 V to 36 V |
| Input Offset Voltage | 2.0 mV minimum |
| Response Time | 1.3 µs |
| 輸出類型 | Open-collector |
| Supply Configuration | Single or split supply |
| Common-Mode Input Range | Includes ground under single-supply operation |
| Output Compatibility | CMOS, DTL, ECL, MOS, and TTL compatible |
| Input Voltage | 2 V to 36 V operating range |
| 腳位數 | 8 pins |
| 封裝 | 8-pin SOIC |
| 安裝類型 | Surface mount |
| Temperature Grade | Commercial grade |
LM393DG 腳位配置
| 腳位 1 | OUT1 — Comparator 1 open-collector output |
| 腳位 2 | IN1- — Comparator 1 inverting input |
| 腳位 3 | IN1+ — Comparator 1 non-inverting input |
| 腳位 4 | GND — Ground connection |
| 腳位 5 | IN2+ — Comparator 2 non-inverting input |
| 腳位 6 | IN2- — Comparator 2 inverting input |
| 腳位 7 | OUT2 — Comparator 2 open-collector output |
| 腳位 8 | VCC — Positive supply connection |
典型應用
LM393DG 適用於 6 應用s: Industrial Threshold Detection, Battery Voltage Monitoring, Overvoltage and Undervoltage Protection, Sensor Signal Conditioning, Open-Collector Logic Interfaces, Consumer and Automotive Equipment.
Industrial Threshold Detection
The LM393DG is appropriate for industrial threshold detection because it combines a 2.0 mV minimum input offset voltage with a 1.3 µs response time in two independent channels. Place the signal under test on one input and a precision reference on the other, then use the open-collector output to trigger a control signal. The common-mode range extending to ground supports sensors whose useful output lies near the lower rail. Because the output is open collector, fit a suitable pull-up resistor and verify its voltage against the receiving logic. For new designs, compare the obsolete LM393DG with LM393DR2G to confirm grade and sourcing requirements.
推薦
Battery Voltage Monitoring
The LM393DG can monitor a battery-derived voltage against a fixed or adjustable reference because its 2 V to 36 V operating range accommodates many single-cell and multi-cell measurement interfaces. The 2.0 mV minimum offset voltage helps preserve threshold accuracy, while the ground-reaching common-mode range supports low-side sensing. Connect the comparator output to a pull-up and use it to signal a charger controller, load switch, or host input. Account for battery chemistry, tolerance drift, input bias error, and open-collector pull-up current. For new battery-management builds, LM393DR2G is the more lifecycle-practical onsemi starting point.
推薦
Overvoltage and Undervoltage Protection
The two independent LM393DG channels support window monitoring in which one comparator detects an upper threshold and the other detects a lower threshold. The 1.3 µs response time allows the outputs to react to changing supply conditions, while the 2 V to 36 V operating range supports a broad class of protected rails. Use each open-collector output with its own pull-up or combine the outputs when wired logic is intended. Design the divider and reference network for worst-case tolerance, and verify that the monitored voltage remains inside the comparator common-mode range. LM393DR2G is the preferred onsemi candidate when an active sourcing path is required.
推薦
Sensor Signal Conditioning
The LM393DG can convert a low-level sensor output into a digital threshold event, making it useful for resistive, inductive, or switching sensors. Its common-mode input range extending to ground is valuable when the sensor output lies near the lower supply rail, and the 2.0 mV minimum offset voltage supports close threshold comparisons. The open-collector output can drive an MCU input, indicator circuit, or relay-control stage through a pull-up. Keep sensor traces short and separate them from switching nodes to prevent false triggering. Before production, verify input bias current, noise, hysteresis strategy, and whether a Schmitt-trigger stage is required for noisy signals.
推薦
Open-Collector Logic Interfaces
The LM393DG's open-collector output is useful when a system must support wired logic, level translation, or a pull-up voltage selected by the designer. The output is compatible with CMOS, DTL, ECL, MOS, and TTL logic families according to the manufacturer datasheet, giving the device broad interfacing utility. Place the pull-up resistor close to the receiving input when propagation timing matters, and confirm the comparator's sink-current capability at the selected voltage. The dual-channel configuration can implement two wired nodes or complementary conditions. Since LM393DG is obsolete, verify that LM393DR2G retains the required output-current and logic-level specifications before releasing a new board.
推薦
Consumer and Automotive Equipment
The onsemi LM393 datasheet identifies consumer, automotive, and industrial electronics as intended application areas, making the LM393DG suitable for general-purpose decision circuits in those systems. Its two independent channels can handle separate warning or control thresholds, while single or split supply operation supports different power arrangements. For automotive production, however, do not infer AEC-Q100 qualification from the family description alone; the exact onsemi ordering code must be verified. For consumer and industrial builds, compare LM393DR2G and LM393NG to identify the appropriate temperature grade and active manufacturing path while retaining the SOIC-8 footprint.
推薦
推薦產品摘要
工程參考資料，適用於 LM393DG — 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 | LM393DR2G | LM393NG | LM393M | LM393D | LM393 |
|---|---|---|---|---|---|---|
| Brand | onsemi | onsemi | onsemi | onsemi | STMicroelectronics | Texas Instruments |
| Package | 8-pin SOIC | 8-pin SOIC | 8-pin SOIC | 8-pin SOIC | 8-pin SOIC | 8-pin SOIC |
| Comparator Count | 2 independent channels | 2 channels | 2 channels | 2 channels | 2 channels | 2 channels |
| Output Type | Open-collector | Open-collector | Open-collector | Open-collector | Open-collector | Open-collector |
主要差異化特點
- Same-manufacturer replacement path (對比LM393DR2G)
- Ground-reaching input range (對比LM393D)
- Documented offset and response performance (對比LM393)
設計說明
Do not treat the LM393 open-collector output as a push-pull output. Each output requires an external pull-up unless the design intentionally uses wired logic. Select the pull-up voltage within the receiving device's input limits, verify the comparator sink-current capability, and place the resistor close to the load when fast transitions or long PCB traces could increase propagation delay.
Keep the two differential input pairs short and route them away from switching nodes, relay coils, inductors, and high-current return paths. Connect the supply bypass capacitor directly to pins 8 and 4, with the ground return kept short. If the inputs are sensitive, use a compact reference divider and avoid sharing a long ground trace with high-current loads.
An LM393 comparator can chatter when the differential input crosses the threshold slowly or when noise appears near the reference. Add controlled positive feedback for hysteresis, maintain adequate input overdrive, and avoid routing sensitive inputs next to the open-collector output and pull-up network. Validate the switching point over temperature, supply tolerance, and component tolerance rather than relying on a nominal threshold alone.
Because LM393DG is obsolete, do not release a new PCB around remaining inventory without a formal second-source plan. Review LM393DR2G first for same-manufacturer continuity, then compare LM393NG, LM393M, LM393D, and the TI LM393 against the original approved specification. Check temperature grade, electrical limits, qualification, marking, and source traceability rather than relying only on the SOIC-8 footprint.
合規資訊
The manufacturer datasheet identifies consumer, automotive, and industrial applications, but this does not establish AEC-Q100 qualification for the exact LM393DG ordering code. RoHS, REACH, lead-free, halogen-free, and conflict-minerals status require confirmation from the manufacturer's current material-compliance records.