LM393ADE4 - Dual 36V Open-Collector Comparator | TI
料号： LM393ADE4 ✓ 量产中LM393ADE4 概述
A comparator is an analog integrated circuit that evaluates two input voltages and switches its output according to their relationship. A general-purpose comparator belongs to the broader amplifier and comparator IC category, where it sits between simple logic gates and precision signal-conditioning channels. Unlike an operational amplifier, a comparator is designed for fast, saturated output transitions rather than linear amplification, making it suitable for threshold detection, level translation, and monitoring.
The LM393 family provides two independent comparators in one 8-SOIC package. Its principal features include a 2 V to 36 V supply range, operation with a common-mode input range including ground, and open-collector outputs. These characteristics allow the device to monitor slow analog signals, supervise supply rails, interface to open-drain buses, or implement simple window-detection circuits using external resistor networks.
Both comparator channels share the supply pins but otherwise operate independently. Their inputs can accept voltages extending below the positive supply rail, provided the differential input voltage remains within the rated supply span. Because each output is open collector, the output requires an external pull-up resistor, normally connected to the supply used by the receiving logic. Several comparator outputs can share one pull-up when wired-AND behavior is acceptable.
Typical uses include industrial control and monitoring, overvoltage and undervoltage detection, temperature-condition signaling, battery threshold checking, and sensing interfaces that must operate from higher-voltage rails than ordinary 5 V CMOS logic. The wide supply range also allows the LM393ADE4 to operate from an 18 V industrial rail while its pull-up keeps the logic interface at a separate, lower voltage.
When laying out the circuit, connect input sources so that absolute maximum differential and common-mode limits are respected, and place the output pull-up resistor close to the device or logic receiver. Avoid using the open-collector output to source current directly; the pull-up must provide the load current. Also verify compatibility between the unused output and its pull-up node before combining multiple channels.
This page consolidates supply, package, pinout, drop-in comparison, and application guidance for engineers evaluating the LM393ADE4. It also highlights the practical differences among same-family and cross-brand SOIC-8 replacements, including where supply range, input common-mode limits, and output structure differ.
直接替换替代料： LM393ADE4 ——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📋 参考替代料（不在目录中）
LM2903DR
✅ 直接替换联系询价
查看数据手册 →LM393LVDR
✅ 直接替换📋 参考替代料（不在目录中）
TS393
✅ 直接替换📋 参考替代料（不在目录中）
LMV393
✅ 直接替换📋 参考替代料（不在目录中）
LM393ADE4 最大额定值与电气特性
| Comparator Type | General Purpose |
| Number of Channels | 2 |
| Number of Elements | 2 |
| Supply Voltage Range, Single | 2 V to 36 V |
| Supply Voltage Range, Dual | ±1 V to 18 V |
| Total Dual-Supply Span | 2 V to 36 V |
| 输出类型 | Open-Collector |
| Logic Compatibility | TTL, MOS, and CMOS |
| Common-Mode Input Range | Includes ground |
| Differential Input Voltage Range | ±38 V |
| Maximum Tested Supply Voltage | 30 V |
| Input Offset Voltage | 2 mV |
| Propagation Delay | 1.3 us |
| 封装 | 8-SOIC, 0.154 in x 3.90 mm width |
| 安装类型 | Surface Mount |
LM393ADE4 引脚配置
| 引脚 1 | OUT1 — Open-collector output of comparator channel 1 |
| 引脚 2 | IN1- — Inverting input of comparator channel 1 |
| 引脚 3 | IN1+ — Non-inverting input of comparator channel 1 |
| 引脚 4 | GND — Ground connection |
| 引脚 5 | IN2+ — Non-inverting input of comparator channel 2 |
| 引脚 6 | IN2- — Inverting input of comparator channel 2 |
| 引脚 7 | OUT2 — Open-collector output of comparator channel 2 |
| 引脚 8 | VCC — Positive supply connection |
典型应用
LM393ADE4 适用于 6 应用s: Industrial Overvoltage and Undervoltage Supervision, Battery Threshold Detection, Open-Drain Bus and Logic Interfacing, Temperature and Analog Sensor Thresholding, Motor and Power-Supply Control, Sensor Signal Conditioning and Window Detection.
Industrial Overvoltage and Undervoltage Supervision
The LM393ADE4 suits 24 V industrial supervision because it operates from a single 2 V to 36 V supply and its common-mode input range includes ground. Place a resistor divider from the monitored rail into IN+, compare the scaled signal against a reference applied to IN-, and use the open-collector output to assert an alarm. The wide supply span reduces the need for a separate low-voltage supervisor in many designs. Because the output only pulls low, connect a pull-up to the alarm-logic supply and account for its current during a fault. Verify that the divided input remains inside the differential and common-mode limits.
推荐
Battery Threshold Detection
The LM393ADE4 can detect upper and lower battery thresholds with its two independent comparator channels. Each channel compares a resistor-divided pack voltage with a reference, allowing one circuit to indicate overcharge and the other undervoltage. Its 2 V to 36 V supply range provides ample headroom for industrial battery packs, while the common-mode input range including ground simplifies sensing near 0 V. Use the open-collector outputs to drive status indicators or a fault latch through pull-up resistors. Account for the specified 2 mV input offset when setting thresholds that require narrow accuracy.
推荐
Open-Drain Bus and Logic Interfacing
The LM393ADE4 open-collector output is useful for wired-AND signaling and for interfacing a higher-voltage sensing stage to lower-voltage digital logic. Pull the output up to the receiving logic rail rather than the comparator supply, allowing a 24 V monitoring circuit to communicate with a 5 V microcontroller input. When multiple channels are tied to one pull-up, the node remains low while any comparator output is asserted, providing wired-AND behavior. Select the pull-up value to balance speed, leakage, and low-state dissipation, and confirm that the receiving input recognizes the resulting high level.
推荐
Temperature and Analog Sensor Thresholding
推荐
Motor and Power-Supply Control
The LM393ADE4 can implement simple current, voltage, and power-supply protection loops by comparing a scaled feedback signal with a reference. Its wide 2 V to 36 V supply range permits operation from a 24 V control bus, and the common-mode input range including ground simplifies sensing low-side or divided feedback voltages. The open-collector output can pull down a shutdown or interlock line through a pull-up resistor. Keep switching transients away from the input pins with appropriate filtering and confirm that the absolute maximum differential input limit of ±38 V is not exceeded during fault conditions.
推荐
Sensor Signal Conditioning and Window Detection
The two independent LM393ADE4 channels can implement a compact upper and lower threshold window around a sensor signal. Feed both input levels through a resistive network, apply the two references to the opposite inputs, and use the open-collector outputs to indicate conditions above and below the acceptable range. The 2 mV offset rating is useful when designing the threshold boundaries, while the 1.3 us propagation delay supports relatively slow analog monitoring. Because each output requires a pull-up, the two outputs can remain separate or share a node when a combined fault indication is acceptable.
推荐
推荐产品汇总
工程参考数据： LM393ADE4 ——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 | LM2903DR | LM393LVDR | TS393 | LMV393 |
|---|---|---|---|---|---|---|
| Package | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | STMicroelectronics | STMicroelectronics |
| Comparator Type | General Purpose | General Purpose | General Purpose | General Purpose | General Purpose | General Purpose |
| Number of Channels | 2 | 2 | 2 | 2 | 2 | 2 |
关键差异点
- Wider supply range than the cross-brand CMOS alternatives （对比 TS393)
- Direct same-family upgrade path （对比 LM393BDR)
- Higher-voltage operating capability than micropower CMOS substitutes （对比 LMV393)
设计说明
Do not omit the external pull-up resistors on OUT1 and OUT2. The open-collector transistors can sink current but cannot source the logic-high state. Choose a pull-up rail that matches the receiving device, confirm that the pull-up current remains within the output-sinking limit, and check that the slower RC rise time produced by a high pull-up resistance does not cause an incorrect double transition at the receiver.
Calculate the divider current and pull-up current separately from the comparator's own supply demand. A high-value input divider reduces loading error but increases sensitivity to input bias current and leakage, while a low pull-up resistance lowers rise time at the cost of greater low-state dissipation. Verify the resistor network against the 2 mV offset rating and add hysteresis where the output must not toggle near the threshold.
Route the comparator input traces away from switching nodes and output traces to minimize capacitive coupling and false transitions. Keep the ground return from pin 4 short and connect it to the quiet ground region of the system. Place input-divider resistors close to the relevant input pins, and place the output pull-up resistor close to the comparator or receiving logic so that the open-collector node has a small vulnerable area.
合规信息
Compliance status must be confirmed for the exact LM393ADE4 ordering code using the current manufacturer product page and product documentation.
