LM2903DR2 - Dual 36 V Comparator | onsemi | SOIC-8
部品番号: LM2903DR2 ✓ 生産中LM2903DR2 概要
A voltage comparator is an analog integrated circuit that compares two input voltages and produces a logic-level indication of their relationship. The LM2903 belongs to the comparator hierarchy within analog and mixed-signal semiconductors, where its primary role is threshold detection rather than linear amplification. Two independent channels allow one package to implement two unrelated sensing functions while sharing a common supply connection and ground reference.
The LM2903 series combines low input-offset voltage, low input-bias current, and a wide supply-voltage range. Input offset voltage is specified as low as 2.0 mV, which helps define the input-voltage difference required to change output state. The 2 V to 36 V operating range supports legacy 5 V logic, industrial 12 V and 24 V rails, automotive-style 12 V systems, and higher-voltage threshold-detection circuits. The open-collector outputs permit an external pull-up voltage to be selected independently of the comparator supply.
Each channel compares a non-inverting input with an inverting input. When the non-inverting voltage is higher, the corresponding open-collector output transistor turns on and pulls the output toward the pull-up rail; when the inverting voltage is higher, the transistor turns off and the output rises. The two channels are independent, although their supply and ground pins are shared. This arrangement supports sensor thresholding, window detection, and complementary decisions without requiring two separate packages.
Typical uses include industrial control and factory automation, battery-powered monitoring, automotive battery and power-system detection, instrumentation, protection circuits, and embedded systems using 3.3 V or 5 V microcontroller interfaces. For digital interfaces, the open-collector output can use a pull-up to the logic rail used by a comparator input or microcontroller. The SOIC-8 package also supports conventional surface-mount assembly and hand-soldering workflows.
Designers should verify the allowable input and output voltage relationships, including the differential input range, and use a pull-up resistor that supplies adequate output current without exceeding the output transistor's limits. Care is also needed when a channel drives a cable, relay, or large capacitance because slower edges and parasitic coupling can affect system behavior. The input network should include suitable filtering when the sensed signal contains switching noise.
This product overview combines the exact LM2903DR2 ordering identity with practical guidance on comparator operation, pin usage, output interfacing, and verified drop-in options. It is intended to support component selection, PCB replacement, and design reviews involving dual open-collector comparators in SOIC-8 packages.
ドロップイン代替品: LM2903DR2 — 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: LM2903DR2 （同一形状・フットプリント） — 相違点: Common-Mode Input Range, Logic Compatibility, Output Type, Package.
LM2903DR2G
✅ 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 →LM2903DG
✅ 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 →LM2903DR
✅ 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 →LM2903QDR
✅ ドロップイン📋 参考代替品（カタログ未掲載）
LM2903BDR
✅ ドロップイン📋 参考代替品（カタログ未掲載）
LM2903DR2 最大定格＆電気的特性
| Comparator Type | Dual differential voltage comparator |
| Number of Channels | 2 channels |
| Supply Voltage Range | 2 V to 36 V |
| Supply Configuration | Single or split supply |
| Common-Mode Input Range | Extended to ground with single-supply operation |
| Input Offset Voltage | As low as 2.0 mV |
| 出力タイプ | Open-collector |
| パッケージ | 8-pin SOIC |
| ピン数 | 8 pins |
| 実装タイプ | Surface mount |
| Comparator Independence | 2 independent channels |
| Logic Compatibility | Compatible with TTL, MOS, and CMOS interfaces |
LM2903DR2 ピン構成
| ピン 1 | OUT1 — Open-collector output of comparator channel 1 |
| ピン 2 | IN1- — Inverting input of comparator channel 1 |
| ピン 3 | IN1+ — Non-inverting input of comparator channel 1 |
| ピン 4 | GND — Ground connection |
| ピン 5 | IN2+ — Non-inverting input of comparator channel 2 |
| ピン 6 | IN2- — Inverting input of comparator channel 2 |
| ピン 7 | OUT2 — Open-collector output of comparator channel 2 |
| ピン 8 | VCC — Positive supply connection |
主な用途
LM2903DR2 の用途: 6 件s: Industrial Control and Automation, Automotive Battery Threshold Detection, Battery-Powered Monitoring, Embedded System Digital Interfaces, Instrumentation and Sensor Conditioning, Power-System Protection and Fault Detection.
Industrial Control and Automation
The LM2903DR2 suits industrial control inputs because its two independent channels can evaluate separate sensor or interlock thresholds while operating from a supply up to 36 V. Its common-mode input range extends to ground in single-supply operation, which is useful for detecting signals near 0 V without a negative rail. Place each channel's reference on the appropriate inverting input and the sensed voltage on the non-inverting input, then use the open-collector output with a pull-up to the controller logic rail. The wide supply range accommodates 5 V, 12 V, and 24 V industrial systems.
おすすめ
Automotive Battery Threshold Detection
The LM2903DR2 is appropriate for low-side battery and vehicle electrical-system threshold detection because its 2 V to 36 V supply capability covers common 12 V automotive rails and provides two independent comparison channels. Each channel can compare a divided battery signal against a precision reference and produce an open-drain fault indication. The pull-up rail can match the receiving load-switch or controller logic, while the input divider limits voltage and provides noise filtering. Confirm exact automotive qualification, temperature grade, and transient requirements for the production ordering code before deployment.
おすすめ
Battery-Powered Monitoring
The LM2903DR2 works well for battery-powered sensing because its two channels can monitor pack voltage and a second condition without requiring dual packages. Low-side monitoring is straightforward when the common-mode range extends to ground during single-supply operation. The open-collector outputs minimize the number of active output stages and allow pull-ups to remain unpowered during shutdown, helping preserve system standby behavior. A resistor divider should include sufficient scale range and filtering for the cell chemistry, while the pull-up value should balance static consumption against the required output rise time.
おすすめ
Embedded System Digital Interfaces
The LM2903DR2 can convert analog threshold events into logic signals for an embedded controller. Its open-collector outputs are compatible with TTL, MOS, and CMOS interfaces, and an external pull-up can connect the output to the microcontroller's 3.3 V or 5 V rail. The two independent channels are useful for dual limit detection, such as an upper and lower threshold around one analog quantity. Keep the comparator inputs short, ground the device close to the controller's ground reference, and consider hysteresis resistors to prevent output chatter when the monitored signal crosses the reference slowly.
おすすめ
Instrumentation and Sensor Conditioning
The LM2903DR2 is useful in instrumentation when a sensor output must be converted into a threshold decision rather than a continuously amplified measurement. One channel can compare the conditioned sensor voltage with a precision reference, and the other can supervise an auxiliary signal or output window. The 2 V minimum supply supports low-energy designs, while the 36 V maximum rating accommodates higher-voltage industrial stimulus circuits when appropriate protection is added. Use a low-noise reference, short feedback traces, and an input RC filter to prevent broadband noise from repeatedly changing the output state.
おすすめ
Power-System Protection and Fault Detection
The two LM2903DR2 channels can implement independent overvoltage, undervoltage, or fault detections around a protected power rail. A scaled supply signal can be compared with a reference, and the open-collector result can drive a host latch, relay-control stage, or fault indicator. The comparator's 36 V supply capability supports industrial power rails, although input protection may still be required for transients and high-energy faults. Validate the divider's operating current, reference accuracy, hysteresis, and fault-response time across the complete temperature range and worst-case tolerance stack.
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: LM2903DR2 — 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 | LM2903DR2G | LM2903DG | LM2903DR | LM2903QDR | LM2903BDR |
|---|---|---|---|---|---|---|
| Brand | onsemi | onsemi | onsemi | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | SOIC-8 | SOIC-8 - same | SOIC-8 - same | SOIC-8 - same | SOIC-8 - same | SOIC-8 - same |
| Function | Dual differential voltage comparator | Dual comparator | Dual comparator | Dual differential comparator | Dual comparator | Dual comparator, B-version |
| Number of Channels | 2 channels | 2 channels | 2 channels | 2 channels | 2 channels | 2 channels |
主な差別化要因
- Lower offset specification in the upgraded comparator family （vs LM2903BDR)
- Two independent channels in one surface-mount package （vs LM2903DR)
- Wide operating supply range for industrial threshold detection （vs LM2903DR2G)
- Open-collector interface flexibility （vs LM2904P3)
設計ノート
Do not treat an open-collector output as a actively driven logic output. Add a pull-up resistor to the voltage rail required by the receiving device, and verify that the resistor allows sufficient output-low current while keeping the output rise time short enough for the system. The pull-up rail may differ from the LM2903DR2 supply, which is useful for level translation, but the resulting output must remain within the datasheet's permitted output-voltage limits. Avoid leaving the open-collector pins unconnected because their state will then be undefined.
Use a compact ground return and connect the comparator ground directly to the quiet ground plane rather than routing through a noisy motor or switching-current path. Keep the non-inverting and inverting input traces short, with the reference resistor or divider close to the relevant input pin. Place input filtering capacitors near the device when the monitored signal contains switching noise. Separate the pull-up routing from sensitive high-impedance input nodes, and review the board's power and return paths so comparator switching transients do not couple into the reference voltage.
Add deliberate hysteresis when the input signal crosses the threshold slowly or contains noise. A positive-feedback resistor from the output to the non-inverting input creates a controlled separation between the rising and falling switching thresholds, reducing repeated output transitions. Size the feedback network against the input-bias current, pull-up value, and required noise margin rather than choosing a resistor solely for a nominal voltage offset. Verify the resulting trip points over temperature and resistor tolerance because both offset voltage and reference accuracy contribute to the final threshold.
Plan the supply network for the comparator's operating range and the transient behavior of the surrounding system. Place the supply-bypass capacitor close to pin 8 and the ground reference close to pin 4, with a short and low-impedance path between them. If the monitored source can produce fast transients, protect the input pins with suitable clamping and series resistance while confirming that the added impedance does not degrade the intended response time. Split-supply operation should use properly decoupled positive and negative rails, with the negative rail referenced to the same system ground.
コンプライアンス情報
No explicit RoHS, REACH, lead-free, halogen-free, conflict-minerals, or automotive-qualification statement was found for the exact onsemi LM2903DR2 ordering code. AEC-Q100 is marked not applicable because this is a general-purpose dual comparator rather than an automotive-qualified product.