LM393MX - Dual Open-Collector Comparator, 2-36V | Texas Instruments
部品番号: LM393MX ✓ 生産中LM393MX 概要
A comparator is an analog integrated circuit that compares an input voltage with a reference voltage and changes its output state when the relationship between those voltages reverses. The LM393 belongs to the comparator hierarchy within analog and power-management semiconductors. Its open-collector output architecture differs from push-pull or CMOS outputs because the output transistor requires an external pull-up resistor to establish a high voltage.
The principal benefits of the LM393MX are its wide 2 V to 36 V operating range, low 1 mA supply current, two independent comparison channels, and open-collector outputs that can support wired logic or interface signaling. The verified data identifies the package as 8-SOIC, making it practical for conventional surface-mount PCB assembly. Its commercial operating-temperature range is listed as 0°C to +70°C.
Each channel compares a non-inverting input with an inverting input. When the non-inverting input is higher, the associated open-collector output transistor turns on and pulls the output toward ground. When the non-inverting input is lower, the transistor turns off and the external pull-up resistor raises the output. This behavior allows the output voltage to be established by the system supply and interface rather than by the comparator alone.
Typical uses include battery-voltage supervision, industrial sensor thresholds, overvoltage and undervoltage detection, signal conditioning, and control-system interlocks. Its two channels can implement two independent decisions, such as monitoring two regulated rails in one controller. Because the output is open collector, applications must include a suitable pull-up resistor and must account for the sink-current capability of the output transistor.
A primary design consideration is that an open-collector output cannot operate as a push-pull logic output without external circuitry. The pull-up resistor determines the rise time, available current, and power loss, while the output node should remain within the voltage limits of the connected logic family. Input common-mode range, output sink current, response time, and offset-voltage limits should be verified in the manufacturer datasheet before using the device outside the verified operating conditions.
This page combines the verified manufacturer and distributor specifications, same-package drop-in alternatives, practical comparator design guidance, and application-focused selection information. It also distinguishes verified values from parameters that still require confirmation from the complete LM393 datasheet or a specific alternative manufacturer's documentation.
ドロップイン代替品: LM393MX — 同一パッケージでピン互換。PCBの作り直しが必要な異なるパッケージの部品は除外されています。
このシリーズのバリエーション
同一シリーズでドロップイン互換のモデル: LM393MX （同一形状・フットプリント） — 相違点: Operating Temperature Range, Output Type, Package, Response Time.
LM393MX/NOPB
✅ ドロップイン📋 参考代替品（カタログ未掲載）
LM393DT
✅ ドロップイン価格はお問い合わせください
データシートを見る →LM393B
✅ ドロップイン📋 参考代替品（カタログ未掲載）
LM393LV
✅ ドロップイン📋 参考代替品（カタログ未掲載）
LM393MX
✅ ドロップイン価格はお問い合わせください
データシートを見る →LM393MX
✅ ドロップイン価格はお問い合わせください
データシートを見る →LM393MX 最大定格＆電気的特性
| Comparator Type | Standard (General Purpose) |
| Number of Comparators | 2 |
| 出力タイプ | Open-Collector |
| Common-Mode Behavior | Rail-to-Rail |
| Supply Voltage Range | 2 V to 36 V |
| 電源電流 | 1 mA |
| Response Time | 1.3 µs |
| パッケージ | 8-SOIC |
| 動作温度範囲 | 0°C to +70°C |
| 実装タイプ | Surface Mount |
| ピン数 | 8 pins |
LM393MX 8-soic ピン配置ガイド
LM393MX (8-soic パッケージ) のピン配置。 このアナログコンポーネントは、入力、出力、および電源ピンを備えています。オフセットナル、補償、イネーブルピンの設定については、メーカーのデータシートを参照してください。信号調整やアンプ回路に最適です。
詳細なピン配置データはありません: LM393MX.
詳細は データシート をご参照ください。
主な用途
LM393MX の用途: 6 件s: Industrial Threshold Monitoring, Battery Voltage Supervision, Sensor Signal Conditioning, Overvoltage and Undervoltage Protection, Power-Supply Fault Signaling, Communication Interface Conditioning.
Industrial Threshold Monitoring
The LM393MX fits industrial threshold monitoring because its two independent channels can compare separate sensor or supply voltages against external references while operating across a verified 2 V to 36 V supply range. The open-collector outputs can pull fault lines, relay-control signals, or PLC inputs toward ground and use external pull-up resistors for logic-high levels. Its verified 1 mA supply current is useful in continuously powered monitoring equipment, while the 1.3 µs response time supports decisions that do not require high-speed edge detection. The commercial 0°C to +70°C specification must be checked against the enclosure's actual ambient range; a wider-temperature comparator may be necessary for harsher industrial environments.
おすすめ
Battery Voltage Supervision
The LM393MX is appropriate for battery voltage supervision where the input rail may exceed the conventional 5 V logic level and the available supply range is 2 V to 36 V. Two comparison channels can independently monitor charge and discharge limits, generating open-collector status indications when each measured battery voltage crosses its reference threshold. The low verified supply current of 1 mA helps limit standing load, while the 1.3 µs response time allows prompt protection signaling. Pull-up resistors define the status-logic levels, and the application must include hysteresis or filtering to prevent repeated switching when the monitored voltage oscillates around a threshold.
おすすめ
Sensor Signal Conditioning
The LM393MX can convert analog sensor outputs into clean open-collector digital events, making it useful when a sensor crosses a defined operating boundary. Its dual architecture supports two thresholds or two sensor channels without duplicating the comparator package, while the 1.3 µs response time is suitable for common temperature, level, and position interfaces. The 2 V to 36 V supply range permits operation from several industrial or automotive-style rails after appropriate protection. However, open-collector outputs require pull-up resistors, and their rise time is determined by resistance, capacitance, and leakage. Input offset and common-mode limits, which were not present in the supplied excerpts, must be checked against the sensor's output range.
おすすめ
Overvoltage and Undervoltage Protection
The LM393MX supports overvoltage and undervoltage protection by using its two channels to compare a protected rail against upper and lower reference thresholds. The 2 V to 36 V operating range covers many protected DC systems, and the two open-collector outputs can independently drive shutdown, alarm, or load-disconnect requests. With a verified 1.3 µs response time, the comparator can react quickly enough for many control-loop protection tasks, although total fault-disconnect time also depends on external circuitry. The output pull-up network must be designed for the connected logic voltage. Designers should add hysteresis and input filtering to avoid noise-induced false trips, then verify every protection limit against the manufacturer datasheet.
おすすめ
Power-Supply Fault Signaling
The LM393MX is well suited to power-supply fault signaling because its open-collector outputs can directly pull down a fault line, status LED, or system-enable input when a monitored rail is out of range. Its low verified supply current of 1 mA reduces overhead in multi-rail systems, and two channels permit separate positive- and negative-rail checks or two sequential supply thresholds. The 2 V to 36 V input range provides flexibility across widely distributed supplies. External pull-up resistors set the fault-logic polarity, and RC filtering at each input can improve immunity to switching-node transients. The 0°C to +70°C operating specification should be treated as the commercial limit unless a wider-temperature grade is selected.
おすすめ
Communication Interface Conditioning
The LM393MX can condition a communication or control signal by comparing it against a threshold and converting the result into an open-collector logic indication. The 1.3 µs response time is useful for ordinary control signals and low-rate digital qualification, while the wide 2 V to 36 V supply range permits operation above conventional 5 V interface levels. Both comparator channels can monitor separate active-high and active-low conditions. A pull-up resistor establishes the logic-high state when the output transistor is off, and the selected resistor should satisfy the receiving logic's input-current requirements. For high-speed data lines, rise time, propagation delay, overshoot, and input capacitance must be analyzed rather than using the LM393MX as a general-purpose high-speed logic replacement.
おすすめ
おすすめ製品の概要
エンジニアリング参考データ: LM393MX — 比較、設計ガイダンス、コンプライアンス情報。
選定ガイド
代替品との比較
| パラメータ | この製品 | LM393MX/NOPB | LM393 | LM393B | LM393LV | LM393MX | LM393MX |
|---|---|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | ROHM Semiconductor | onsemi |
| Package | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC |
| Number of Comparators | 2 | 2 | 2 | 2 | 2 | 2 | 2 |
主な差別化要因
- Wide verified operating supply range （vs LM393LV)
- Low verified supply current （vs LM393MX from ROHM Semiconductor)
- Confirmed general-purpose open-collector architecture （vs LM393MX from onsemi)
- Two independent comparison channels （vs Single-channel alternatives)
設計ノート
The most important implementation detail is that the LM393MX output is open collector. Add a pull-up resistor on each used output so the node can reach a valid logic-high voltage after the output transistor turns off. Select the resistor against the receiving family's input-current requirements and the comparator's output sinking capability. If the output drives a long cable or slow logic device, calculate the cable/input capacitance and the resulting pull-up RC rise time before accepting the switching speed.
Do not rely on the nominal 1.3 µs response time alone when sensing noisy or fast-changing voltages. Add an input RC network sized to reject switching-node energy, and add positive feedback for hysteresis when the compared voltage can sit near the threshold. Excessive filtering can slow comparator recovery, so validate the complete delay through the input network, comparator channel, pull-up resistor, and downstream receiver rather than relying only on the catalog propagation value.
Place the device so that comparator inputs and ground return paths remain away from high-current switching nodes and inductors. Keep the pull-up resistor close to the output because long traces add capacitance and susceptibility to coupling. Connect the bypass capacitor close to the supply and ground pins using a short, low-loop-area path, and maintain continuous ground-plane coverage beneath the SOIC where practical. Review the final pin numbering against the current TI datasheet before releasing the PCB artwork.
Although the verified LM393MX supply-current figure is 1 mA, total system consumption also includes input bias current, output leakage, and the pull-up network. The pull-up resistor continuously dissipates power when an output transistor is on: estimated power equals the squared pull-up voltage divided by the resistance. Use that calculation as a design estimate, then confirm operating-temperature, absolute-maximum, and output-current limits from the manufacturer datasheet for the chosen supply and logic levels.
コンプライアンス情報
The supplied verified excerpts identify the LM393 as intended for commercial-grade applications but do not explicitly state RoHS, REACH, lead-free, halogen-free, conflict-minerals, or AEC-Q100 status. These fields remain unknown rather than being inferred.
