LM2903QDGKRQ1 - Dual 36V Automotive Comparator | Texas Instruments
部品番号: LM2903QDGKRQ1 ✓ 生産中LM2903QDGKRQ1 概要
A comparator is an analog integrated circuit that evaluates two input voltages and produces a digital output indicating whether the non-inverting input is above or below the inverting input. Within the broader hierarchy, the LM2903-Q1 is a differential comparator, a general-purpose analog IC, and a member of the power-management and signal-conditioning semiconductor category. Its open-collector output structure allows several comparator outputs to be wired together for wired-AND operation and requires an external pull-up resistor for normal logic-level operation.
Key characteristics include dual-channel operation, a 36 V maximum supply capability, and open-collector outputs suitable for automotive battery-powered systems. The AEC-Q100 Grade 0 and Grade 1 qualification supports demanding automotive environments, while the wide input voltage range reduces the need for separate input protection in many 12 V, 24 V, and 36 V system architectures. The 8-pin VSSOP package also supports compact PCB layouts where space is limited.
The LM2903-Q1 architecture is designed for general-purpose threshold detection rather than high-speed waveform discrimination. Its differential input stage allows sensing of small analog changes, and the open-collector outputs can directly pull up a logic bus, drive a relay driver, or interface with automotive transceiver inputs. The open-collector configuration also provides wired-AND behavior when multiple comparator channels share a pull-up resistor.
Typical applications include automotive battery monitoring, overvoltage and undervoltage detection, window or door sensing, sensor conditioning, and industrial control systems. In battery systems, the wide supply tolerance supports operation across load dump and automotive electrical-environment conditions when paired with appropriate protection. In control logic, two independent channels can monitor separate thresholds or implement a window comparator using external resistor networks.
When designing the PCB, route the comparator inputs away from switching nodes and high-current return paths because input offset voltage can make nearby interference appear as a false state transition. Place the pull-up resistor close to the open-collector output and verify that its value keeps the logic rise time within the receiving device's limits. Automotive designs should also include the transient-protection components required by the complete vehicle electrical system rather than relying on the comparator alone for surge suppression.
This page consolidates the verified package, voltage, output, qualification, and lifecycle information with application guidance, comparison parameters, and design notes that support faster component selection and PCB implementation.
ドロップイン代替品: LM2903QDGKRQ1 — 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。
LM2903B-Q1
✅ ドロップイン📋 参考代替品（カタログ未掲載）
LM293DGKR
✅ ドロップイン📋 参考代替品（カタログ未掲載）
LM393DGKR
✅ ドロップイン📋 参考代替品（カタログ未掲載）
LM2904DGKRG4
✅ 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 →LM2903QDGKRQ1 最大定格＆電気的特性
| Product Type | Dual differential comparator |
| Number of Channels | 2 channels |
| Supply Voltage Range | 3 V to 36 V |
| Maximum Supply Voltage | 36 V |
| Common-Mode Input Range | Rail-to-rail |
| 出力タイプ | Open-collector |
| Automotive Qualification | AEC-Q100 Grade 0 and Grade 1 |
| パッケージ | 8-pin VSSOP (DGK) |
| 実装タイプ | Surface mount |
| Supplier Packaging | Tape and reel |
LM2903QDGKRQ1 8-pin vssop (dgk) ピン配置ガイド
LM2903QDGKRQ1 (8-pin vssop (dgk) 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: LM2903QDGKRQ1.
詳細は データシート をご参照ください。
主な用途
LM2903QDGKRQ1 の用途: 6 件s: Automotive Battery Voltage Threshold Detection, Vehicle Sensor Interface and Limit Monitoring, Industrial Overvoltage and Undervoltage Protection, Window and Door Position Detection, Wired-AND Fault Aggregation, Precision Level and Reference Crossing.
Automotive Battery Voltage Threshold Detection
The LM2903QDGKRQ1 fits 12 V, 24 V, and 36 V automotive battery systems because its supply range extends to 36 V and the LM2903-Q1 family is AEC-Q100 Grade 0 and Grade 1 qualified. Place one channel across a resistor-divided battery-sense node to flag an overvoltage condition, while the second channel can monitor an undervoltage threshold. The open-collector output can pull down a diagnostic line or shared wired-AND node. External transient protection remains necessary because the comparator's specified operating range is not a substitute for a complete load-dump or surge-protection network.
おすすめ
Vehicle Sensor Interface and Limit Monitoring
The LM2903QDGKRQ1 can compare a conditioned sensor signal against a precision reference to detect upper and lower operating limits. Its differential inputs support sensing of small changes around a common reference voltage, while the two independent channels permit duplicated or complementary monitoring functions. Automotive qualification supports use in cabin, chassis, and body electronics where temperature grades and reliability documentation matter. Use the pin-description table in the manufacturer datasheet to route the inputs away from motor, relay, and CAN-bus return currents.
おすすめ
Industrial Overvoltage and Undervoltage Protection
In industrial control systems, the LM2903QDGKRQ1 can supervise a divided 24 V or 36 V supply and assert a fault signal when the monitored rail enters an invalid band. The wide 3 V to 36 V supply capability reduces level-shifting requirements compared with a 5 V comparator. Its open-collector output can drive a wired-AND protection bus, although an external pull-up must define the logic-high level. Add surge suppression at the board boundary and ensure the divider resistors carry adequate voltage ratings for continuous high-voltage operation.
おすすめ
Window and Door Position Detection
The LM2903QDGKRQ1 is suitable for vehicle body and closure sensing because it compares a switch or position-sensor signal with a reference and converts the result into an open-collector logic state. The wide supply tolerance supports operation from the vehicle electrical system, while AEC-Q100 Grade 0 and Grade 1 qualification addresses automotive temperature requirements. Design the input network to reject connector transients and debounce mechanical contacts in firmware or with external filtering, since a comparator reports the instantaneous analog threshold crossing.
おすすめ
Wired-AND Fault Aggregation
The open-collector outputs of the LM2903QDGKRQ1 allow two channels to share a pull-up resistor and form a wired-AND fault bus. This arrangement is useful in automotive and industrial controllers where multiple subsystems must report a fault to one central node without each driver fighting the others. Pull the shared line high with a resistor sized for the aggregate sink current, and keep the pull-up close to the receiver to limit rise time. If several boards are connected, account for ground offsets and leakage currents so that one board cannot corrupt the state seen by another.
おすすめ
Precision Level and Reference Crossing
The LM2903QDGKRQ1 can be used as a precision threshold element in reference-monitoring and level-detection circuits where a resistor divider establishes the set point. Its differential input arrangement is useful when the signal of interest moves around a bias voltage rather than from ground. Because comparator output offset directly shifts the switching threshold, include the device's verified input offset voltage in the error budget. The rail-to-rail common-mode capability simplifies sensing near either supply rail when the operating voltage remains within the manufacturer's specified conditions.
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: LM2903QDGKRQ1 — 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 | LM2903B-Q1 | LM293DGKR | LM393DGKR | LM2904DGKRG4 |
|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | 8-pin VSSOP (DGK) | 8-pin VSSOP (DGK) orderable suffix to confirm | 8-pin VSSOP | 8-pin VSSOP | 8-pin VSSOP |
| Comparator Configuration | Dual differential comparator | Dual differential comparator | Dual differential comparator | Dual differential comparator | Dual differential comparator |
主な差別化要因
- Automotive-grade dual comparator in a compact 8-pin VSSOP （vs LM393DGKR)
- Wide supply range for vehicle and industrial rails （vs LM293DGKR)
- Next-generation drop-in upgrade path （vs LM2903B-Q1)
- Open-collector outputs support wired-AND fault buses （vs LM2904DGKRG4)
設計ノート
Route both differential inputs as a compact pair and keep them away from switching nodes, relay coils, high-current return paths, and the ground edges of inductors. Comparator input offset is small, so even modest coupling can shift the effective threshold. Use a solid ground reference for the two channels and terminate unused input nodes according to the pin-description table in the manufacturer datasheet.
Place the external pull-up resistor from each open-collector output to the local logic supply and size it for the output sink-current limit, receiver input current, and required rise time. Keep the pull-up close to the receiver when the trace is long, because distributed capacitance and board leakage increase the effective output resistance after the transistor turns off. Use separate local supply decoupling to prevent comparator switching events from disturbing the threshold reference.
Do not treat the 36 V supply capability as unlimited transient tolerance. Automotive and industrial inputs can experience load dump, inductive spikes, and ESD events beyond normal operating conditions, so use protection networks with the correct standoff voltage and clamping behavior. Also verify the common-mode range and output-current limits at the temperature grade required by the vehicle or equipment program.
Keep high-voltage divider traces short and away from sensitive comparator inputs, and use resistor networks with low temperature coefficients when the switching threshold must remain stable. A common ground reference is preferable to routing high-current returns through the comparator ground pin. In EMI-sensitive equipment, filter the sensed input rather than relying on the output's open-collector state alone to remove interference-induced transitions.
コンプライアンス情報
The TI LM2903-Q1 product page identifies the family as AEC-Q100 Grade 0 and Grade 1 qualified. RoHS, REACH, lead-free, halogen-free, and conflict-minerals declarations are not explicitly confirmed in the cited product-page extract.
