LM393PWG4 - Dual Open-Collector Comparator | Texas Instruments
MPN： LM393PWG4 ✓ 啟用中LM393PWG4 概覽
A comparator is an analog integrated circuit that compares two input voltages and changes its output state when the differential input crosses a defined threshold. In the broader hierarchy, a comparator belongs to the analog IC and signal-conditioning family, where it supports threshold detection, sensing, protection, and digital logic-interface functions. The LM393 family combines two channels in one package, reducing board area compared with two separate single comparators.
The LM393PWG4 provides low supply-current drain of 0.4 mA typical per comparator, with current consumption largely independent of supply voltage. Its open-collector outputs can sink output current while remaining electrically isolated from the positive supply. This architecture is useful when several comparator outputs must share a pull-up node, although the external resistor must be selected to suit the required sink current and rise time.
Operation from a 2 V to 36 V total supply span gives flexibility across low-voltage control systems, industrial equipment, and higher-voltage sensing platforms. The device can also operate from dual supplies when their total span and common-mode limits are respected. Because the output transistor is open collector, the output high voltage is set by the pull-up network rather than by the comparator itself.
Typical uses include window comparators, overvoltage and undervoltage detection, sensor threshold conditioning, relay or solenoid drive decisions, and direct interfacing to open-collector logic. In a battery-powered design, the low supply-current characteristic helps reduce standing power. In a 24 V industrial system, the wide supply range supports operation without a separate low-voltage regulator, subject to the input protection requirements of the individual installation.
Design the PCB with the non-inverting and inverting inputs routed away from switching nodes and the open-collector pull-up placed close to the output node. Confirm the common-mode input range, output-current capability, propagation delay, and output saturation requirements for the specific temperature and supply conditions before releasing the design.
This page combines the LM393PWG4 electrical characteristics, package and pin information, drop-in alternatives, comparison criteria, and practical PCB guidance to support faster component selection and implementation.
直接替換替代品，適用於 LM393PWG4 — 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： LM393PWG4 （相同外形與佔位） — 差異在於 Number of Channels, Package, Response Time.
LM393APWR
✅ 直接替換📋 參考替代品（不在目錄中）
LM393PWRG4
✅ 直接替換聯絡詢價
查看資料表 →LM393PSRG4
✅ 直接替換聯絡詢價
查看資料表 →LM393PWG4 最大額定值與電氣特性
| Comparator Type | Dual differential comparator |
| Number of Channels | 2 channels |
| Supply Voltage Range | 2 V to 36 V |
| Dual-Supply Total Voltage Range | 2 V to 36 V |
| 輸出配置 | Open collector |
| Supply Current per Comparator | 0.4 mA typical |
| 封裝 | 8-pin TSSOP |
| 安裝類型 | Surface mount |
LM393PWG4 腳位配置
| 腳位 1 | OUT1 — Open-collector output of comparator 1 |
| 腳位 2 | IN1- — Inverting input of comparator 1 |
| 腳位 3 | IN1+ — Non-inverting input of comparator 1 |
| 腳位 4 | GND — Ground connection |
| 腳位 5 | IN2+ — Non-inverting input of comparator 2 |
| 腳位 6 | IN2- — Inverting input of comparator 2 |
| 腳位 7 | OUT2 — Open-collector output of comparator 2 |
| 腳位 8 | VCC — Positive supply connection |
典型應用
LM393PWG4 適用於 6 應用s: Industrial Overvoltage Detection, Battery Threshold Monitoring, Open-Collector Logic Interface, Sensor Signal Conditioning, Window Comparator Control, Relay and Solenoid Decision Circuit.
Industrial Overvoltage Detection
The LM393PWG4 fits industrial overvoltage detection because its 2 V to 36 V supply range covers many 24 V control systems. Place one differential input on a scaled sense line and the other on a reference threshold, then use the open-collector output to deassert an enable or fault signal. The 0.4 mA typical drain per comparator limits standing current, while the external pull-up provides a defined fault-state voltage. Protection components should limit fault-current and clamp the input nodes within the device limits.
推薦
Battery Threshold Monitoring
The LM393PWG4 is suitable for battery threshold monitoring because its supply-current drain is 0.4 mA typical per comparator and is largely independent of supply voltage. The device can monitor a divided battery voltage against a reference and generate an open-collector alert when the threshold is crossed. Keeping the pull-up current low reduces continuous battery load, although the resistor must still provide an adequate logic rise time. Account for input bias current when choosing high-value divider resistors.
推薦
Open-Collector Logic Interface
The LM393PWG4 provides a practical open-collector interface between analog sensing and digital control logic. Its output can pull a shared bus node low without driving the positive supply, enabling wired-AND behavior when multiple comparators share one pull-up. The resistor value should balance low-state power against the required rise time and bus capacitance. Because the output does not actively source current, the receiving logic must define a valid high level through the pull-up network.
推薦
Sensor Signal Conditioning
The LM393PWG4 can condition a sensor signal when the design requires a simple threshold decision rather than a high-resolution conversion. Place the sensor-derived voltage on one input and a stable reference on the other, allowing the open-collector output to indicate whether the sensed condition exceeds the limit. The 2 V to 36 V operating span supports industrial sensor circuits, but the common-mode input range must include the sensor's operating voltage. Route sensitive input traces away from switching power nodes to prevent false triggering.
推薦
Window Comparator Control
Two LM393PWG4 channels can be combined into a window comparator for undervoltage and overvoltage supervision. Each channel compares the same divided input against a different reference, while the separate open-collector outputs identify which limit has been crossed. This arrangement is useful in power supplies, test systems, and industrial modules. Reference accuracy, input offset, resistor tolerance, and the pull-up network determine the practical threshold repeatability, so the complete error budget should be checked at the required temperature.
推薦
Relay and Solenoid Decision Circuit
The LM393PWG4 can make the decision stage of a relay or solenoid control circuit by comparing a control or feedback voltage with a reference. Its open-collector output can sink the coil-driver input or participate in an interlock arrangement, avoiding direct high-voltage drive from the comparator. A flyback diode remains required when the output stage switches an inductive load. The pull-up network should be referenced to the logic rail, and the complete design must prevent an uncontrolled output transition from creating an unsafe actuator state.
推薦
推薦產品摘要
工程參考資料，適用於 LM393PWG4 — 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 | LM393APWR | LM393PWRG4 | LM393PSRG4 |
|---|---|---|---|---|
| Package | TSSOP-8 | TSSOP-8 | TSSOP-8 | TSSOP-8 |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Comparator Type | Dual differential comparator | Dual differential comparator | Dual differential comparator | Dual differential comparator |
| Number of Channels | 2 channels | 2 channels | 2 channels | 2 channels |
| Supply Voltage Range | 2 V to 36 V | 2 V to 36 V | 2 V to 36 V | 2 V to 36 V |
| Output Configuration | Open collector | Open collector | Open collector | Open collector |
| Single or Dual Supply | Single or dual supply | Single or dual supply | Single or dual supply | Single or dual supply |
主要差異化特點
- Broad supply range for industrial and embedded sensing (對比LM393LV)
- Two open-collector channels in one TSSOP package (對比LM393PWRG4)
- Low-voltage operation with supply-independent current drain (對比LM2903PWRG4)
設計說明
Place each open-collector pull-up resistor close to the corresponding output and receiver because trace capacitance and shared-bus capacitance slow the rising edge. Keep the two differential inputs away from inductors, switching-node copper, and high-current return paths. Route the ground connection directly to the supply ground plane, and use a solid ground reference beneath the TSSOP where the PCB design permits.
Estimated: with a 24 V supply, a 12 V pull-up, and a 0.4 mA typical supply drain per channel, the LM393PWG4 supply current contributes approximately 9.6 mW per active channel before pull-up and load effects. Calculated as 24 V multiplied by 0.4 mA, this is a design estimate rather than a maximum-power specification. Confirm worst-case supply current and output sink current across temperature before sizing the upstream regulator.
Do not treat the open-collector output as a push-pull logic output. Without an external pull-up, the output cannot actively reach a valid high level. Also verify that the input common-mode voltage remains inside the operating range and that VCC stays at least 1.5 V more positive than the common-mode voltage. A missing pull-up, unsuitable divider resistance, or input transient outside the limits can cause unreliable state changes.
Use a resistor divider that keeps input bias-current error small relative to the required threshold accuracy, and bypass the comparator supply close to pin 8 when operating near a switching converter. If the comparator controls a long digital trace, balance pull-up strength against EMI rise time and use a suitable logic-family pull-down where needed. Validate threshold behavior across supply, temperature, and tolerance conditions.
合規資訊
Compliance status must be confirmed for the exact LM393PWG4 order code using the manufacturer product page and current declaration documents.