LM393DG4 - Dual Open-Collector Comparator | Texas Instruments
部品番号: LM393DG4 ✓ 生産中LM393DG4 概要
A comparator is an analog signal-processing IC that compares two input voltages and produces a logic-level indication of their relationship. The LM393 belongs to the comparator hierarchy: differential comparator, analog comparator, interface IC, and general-purpose semiconductor. It is commonly used in threshold detection, sensor conditioning, window comparisons, and simple control systems where an open-collector output can drive a pull-up network.
Each LM393 channel has two differential inputs, a common supply ground, and an open-collector output. The open-collector architecture allows outputs to be pulled up to a chosen logic voltage and permits wired-AND behavior when multiple comparator outputs share a pull-up node. The low supply-current drain is listed as 0.4 mA typical per comparator, helping reduce system power in applications that do not require continuous high-current output drive.
The LM393 is specified for propagation delay around 0.3 microseconds in distributor product information, making it suitable for general-purpose decision logic rather than high-speed timing applications. The device supports single supply or dual supplies, allowing a 5 V system to compare signals referenced to ground or an analog circuit to use split supplies. Input common-mode and output behavior should be checked against the manufacturer datasheet when operating near supply limits.
Typical uses include battery-powered threshold monitors, industrial sensor interfaces, overvoltage and undervoltage detection, window comparators, and control inputs for motors or relays. Because the output is open collector, an external pull-up resistor is required to establish a valid high level. The pull-up value controls rise time, power consumption, and compatibility with the following logic family.
For PCB design, place decoupling capacitors close to the supply pins and route comparator inputs away from switching nodes and high-current return paths. Keep the input network compact and use a solid ground reference, especially when the comparator detects small signal changes. Check input common-mode range, output sink current, supply limits, and thermal conditions in the manufacturer datasheet before finalizing the circuit.
This page summarizes the LM393DG4 function, electrical envelope, applications, pinout status, and drop-in alternatives for engineers evaluating a robust open-collector dual comparator.
ドロップイン代替品: LM393DG4 — 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: LM393DG4 （同一形状・フットプリント） — 相違点: Package.
LM393DR
✅ ドロップイン✗ 在庫切れ
$0.11 / 個
データシートを見る →LM393DG
✅ 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 →LM393BIDR
✅ ドロップイン📋 参考代替品（カタログ未掲載）
LM393DG4 最大定格＆電気的特性
| Comparator Type | Dual differential comparator |
| Number of Channels | 2 |
| 出力タイプ | Open-collector |
| Supply Voltage Range | 2 V to 36 V |
| Tested Maximum Operating Voltage | 30 V for non-V devices |
| V-Suffix Tested Maximum Operating Voltage | 32 V |
| Propagation Delay | Approximately 0.3 us |
| Supply Current Drain | 0.4 mA typical per comparator |
| Supply Configuration | Single supply or dual supplies |
| Input Configuration | Differential inputs, two channels |
| 出力構成 | Open-collector with external pull-up |
| パッケージ | 8-pin SOIC |
| Package Type | SOIC-8 |
| 実装タイプ | Surface mount |
| Commercial Grade | Commercial-grade applications |
LM393DG4 soic-8 ピン配置ガイド
LM393DG4 (soic-8 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: LM393DG4.
詳細は データシート をご参照ください。
主な用途
LM393DG4 の用途: 6 件s: Battery Voltage Threshold Detection, Industrial Sensor Interfacing, Overvoltage and Undervoltage Protection, Window Comparator Control, Motor and Relay Control Interface, LED and Lighting Threshold Control.
Battery Voltage Threshold Detection
The LM393DG4 is suitable for monitoring a battery or rail against a reference threshold because it provides two differential comparison channels, a 2 V minimum supply, and an open-collector output that can directly drive a pull-up and alert signal. In a two-channel implementation, one section can watch the supply while the other checks a divided battery voltage. The external pull-up sets the logic voltage and output rise time, while the 0.3 microseconds propagation delay is more than sufficient for ordinary power-management decisions. Designers should verify the input common-mode range at the actual battery voltage and include the pull-up current in the system power budget.
おすすめ
Industrial Sensor Interfacing
The LM393DG4 can compare a sensor-derived voltage with an adjustable reference when the application requires a robust open-collector indication rather than a push-pull logic output. The differential inputs allow a small signal to be evaluated against ground or another reference node, while the two channels can monitor two related measurements. Its approximately 0.3 microseconds response supports normal industrial control loops, although propagation delay should be included in margin calculations. Place a pull-up resistor at each output and route the sensor traces away from switching power nodes to reduce false threshold transitions.
おすすめ
Overvoltage and Undervoltage Protection
A pair of LM393DG4 channels can implement independent overvoltage and undervoltage protection by comparing divided input and reference voltages. The 2 V to 36 V supply range supports operation across many industrial and automotive-style control rails, although the non-V maximum operating rating is listed as 30 V. Open-collector outputs allow fault flags to share a pull-up node, producing a wired-AND-style summary. Add hysteresis around the switching threshold to prevent chatter, and verify that the divider, reference, and input voltages remain inside the manufacturer’s specified common-mode range.
おすすめ
Window Comparator Control
The LM393DG4’s two independent differential channels can be arranged as a window comparator when one section detects the lower limit and the other detects the upper limit. Each open-collector output can pull a common status node down when its corresponding limit is violated. The shared output simplifies downstream fault handling, but the pull-up resistor must be selected to meet the input current and capacitance of the receiving logic. For stable operation, use resistor-based hysteresis and keep the threshold network physically close to the comparator to minimize noise pickup.
おすすめ
Motor and Relay Control Interface
The LM393DG4 can generate a low-power control decision that enables a driver stage rather than directly powering a motor or relay coil. Its open-collector output can sink the input current of a suitable driver interface or energize a pull-up-based control node, while the 0.3 microseconds propagation delay provides quick response for ordinary start and stop decisions. The IC should not be treated as the coil-switching element; use a transistor or driver with appropriate voltage and current ratings. Include flyback protection on inductive loads and verify the driver logic levels against the LM393 output configuration.
おすすめ
LED and Lighting Threshold Control
The LM393DG4 can compare a light-derived or current-sense voltage with a reference and control an LED or lighting-driver input through its open-collector output. Two channels support combinations such as daylight and occupancy thresholds or upper and lower light-level limits. The open-collector stage requires a pull-up and can be referenced to the control circuit’s logic rail. Its general-purpose 0.3 microseconds delay is suitable for non-timing-critical lighting decisions. Keep the sense trace short, provide a stable reference, and add hysteresis if the sensor output changes slowly near the selected threshold.
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: LM393DG4 — 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 | LM393DR | LM393DG | LM393BIDR |
|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | onsemi | Texas Instruments |
| Package | 8-pin SOIC | 8-pin SOIC | 8-pin SOIC | 8-pin SOIC |
| Comparator Channels | 2 | 2 | 2 | 2 |
主な差別化要因
- Two-channel comparator in a standard 8-pin SOIC footprint （vs LM393DG)
- Wide single-supply and dual-supply operating range （vs LM393DR)
- Commercial-grade dual differential comparison （vs LM393BIDR)
設計ノート
Place the supply bypass capacitor close to the LM393DG4 supply and ground pins, and keep the open-collector pull-up resistor close to the output node when possible. Route differential inputs as a compact pair away from switching inductors, relay drivers, and high-current return paths. A grounded guard or shielding strategy can help when the comparator detects very small voltage changes.
Do not treat an open-collector output as a push-pull logic output. Each output requires an external pull-up resistor, and the receiver must share a compatible logic reference. Select the resistor to balance sink-current margin against output rise time; a smaller value produces faster edges but increases current. Confirm the input common-mode range at worst-case supply and signal conditions.
Add positive feedback hysteresis when the compared signal can cross the threshold slowly, because noise near the decision point can cause repeated output transitions. Keep the reference divider and input divider values high enough to limit loading but low enough to keep their impedance acceptable for the required noise performance. Validate the complete threshold circuit across temperature and supply tolerance.
The LM393DG4 can operate from a single supply or dual supplies, but the total rail span must remain within the specified 2 V to 36 V range and the applicable maximum rating. Before power sequencing a board, check the input and output states during ramp-up. The pull-up network can dominate current when the output is off, so include it in both normal and fault-state power calculations.
コンプライアンス情報
The manufacturer describes the LM393 as a commercial-grade dual comparator, but no specific RoHS, REACH, halogen-free, or conflict-minerals status was identified in the page data.