LM2903AVQDRG4Q1 - 36V AEC-Q100 Dual Open-Collector Comparator | Texas Instruments
部品番号: LM2903AVQDRG4Q1 ✓ 生産中LM2903AVQDRG4Q1 概要
A comparator is a differential amplifier whose output changes state when one input exceeds the other by more than a defined offset. It converts an analog voltage relationship into a digital logic level, which places it in the hierarchy of analog signal conditioning > comparator > differential amplifier > analog IC. Because both channels are fully independent, one package provides two separate threshold decisions, which halves board area compared with two single comparators.
Key features of the LM2903-Q1 device family include a 36 V maximum single-supply rating, open-collector outputs that can sink up to tens of milliamperes into a pull-up network, very low supply-current drain of roughly 0.4 mA per channel that is largely independent of supply voltage, and input common-mode range that extends close to both supply rails. The automotive-qualified grade adds AEC-Q100 Grade 0 and 1 qualification, supporting ambient temperatures from -40 °C to +125 °C, and the device is rated for the electrostatic and transient conditions typical of 12 V and 24 V vehicle electrical systems.
Each of the two channels presents a non-inverting and an inverting input, a common supply ground, and a separate open-collector output. Because the output stage is open collector rather than push-pull, the output polarity is set by the position of the external pull-up resistor, and the output can be wired-ORed with other open-collector devices such as system alarm lines, sensor buses, or fault indicators. This is a deliberate design choice in automotive systems where a single fault line must be shared and the output must be pulled low in the fail-safe direction.
Typical applications include 12 V and 24 V battery rail overvoltage and undervoltage supervision, window regulator and body electronics threshold detection, ABS wheel-speed sensor conditioning, motor and solenoid current-limit protection, industrial PLC level and limit switching, and DC power-supply UVLO and OVLO window comparators. Each of these applications depends on the wide 36 V supply headroom, the low quiescent current, and the ability to sink a logic-level pull-up current directly.
A key design consideration is that open-collector outputs require an external pull-up resistor, typically 10 kΩ to 100 kΩ, and that the output leakage current in the high state limits the maximum usable pull-up resistance. Placing the pull-up close to the output reduces susceptibility to noise pickup on the shared fault line. Automotive designs should also keep the comparator input traces short and away from switching nodes, because the high-impedance differential inputs are the most sensitive part of the signal chain and are the dominant source of false threshold transitions.
This page combines the LM2903-Q1 technical specifications, an AEC-Q100-aware pin and package breakdown, and a drop-in alternative table that compares automotive-qualified and commercial catalog alternatives in the same 8-SOIC footprint, so engineers can identify a pin-compatible replacement without re-laying out the board.
ドロップイン代替品: LM2903AVQDRG4Q1 — 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: LM2903AVQDRG4Q1 （同一形状・フットプリント） — 相違点: Package, Output Type, Comparator Type, Number of Channels, Operating Temperature Range.
LM2903AVQDRQ1
✅ 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 →LM2903AVQDRG4
✅ 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
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データシートを見る →LM2903BIDR
✅ 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 →LM393ADR
✅ 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 →LM2903YDT
✅ ドロップイン📋 参考代替品（カタログ未掲載）
LM2903AVQDRG4Q1 最大定格＆電気的特性
| Comparator Type | Differential |
| Number of Elements | 2 |
| 出力タイプ | Open-Collector (Open-Drain) |
| Supply Voltage Range (Single Supply) | 2 V to 36 V |
| Supply Voltage Range (Dual Supply) | +/-1 V to +/-18 V |
| Supply Current per Channel | 0.4 mA typ, independent of supply voltage |
| Automotive Qualification | AEC-Q100 Grade 0 and Grade 1 |
| 動作温度範囲 | -40 °C to +125 °C |
| パッケージ | 8-SOIC (D), 3.90 mm body width |
| ピン数 | 8 |
| 実装タイプ | Surface Mount |
| ESD Rating (Machine Model) | Exceeds 100 V, C = 200 pF |
| Channel Independence | 2 independent comparators |
| Shipping Format | Tape and Reel (G4 suffix) |
LM2903AVQDRG4Q1 ピン構成
| ピン 1 | OUT1 — Channel 1 open-collector output |
| ピン 2 | IN1- — Channel 1 inverting input |
| ピン 3 | IN1+ — Channel 1 non-inverting input |
| ピン 4 | GND — Ground / negative supply reference |
| ピン 5 | IN2+ — Channel 2 non-inverting input |
| ピン 6 | IN2- — Channel 2 inverting input |
| ピン 7 | OUT2 — Channel 2 open-collector output |
| ピン 8 | VCC — Positive supply input |
主な用途
LM2903AVQDRG4Q1 の用途: 6 件s: Automotive Battery Rail Overvoltage and Undervoltage Supervision, ABS Wheel-Speed Sensor Signal Conditioning, DC Motor and Solenoid Current-Limit Protection, Industrial PLC Level and Limit Switching, Power Supply UVLO and OVLO Window Comparator, Consumer and Appliance Threshold Detection.
Automotive Battery Rail Overvoltage and Undervoltage Supervision
The LM2903AVQDRG4Q1 fits directly across a 12 V or 24 V vehicle battery rail because its 2 V to 36 V single-supply rating covers both systems without an external attenuator. Placing the inverting input on a precision divider from the battery and the non-inverting input on an internal reference band lets each channel define an independent window threshold. The open-collector outputs pull a shared diagnostic line low when a limit is violated, so a fault is always reported in the safe direction. AEC-Q100 Grade 0 and 1 qualification and the -40 °C to +125 °C range make it the natural choice for body and powertrain control modules, where a false trip on a load dump or cold start must be avoided.
おすすめ
ABS Wheel-Speed Sensor Signal Conditioning
Wheel-speed sensors in ABS modules deliver a small differential signal riding on a noisy, high-voltage-referenced line. The LM2903AVQDRG4Q1 provides two independent comparison channels, so one package can condition the rising and falling edges of the sensor waveform against adjustable thresholds, producing a clean square wave for the wheel-speed MCU. Its low supply-current drain of about 0.4 mA per channel, largely independent of supply voltage, matters because the module is powered continuously from the vehicle battery. The open-collector output can also be pulled up to the MCU logic level directly, and the -40 °C to +125 °C AEC-Q100 Grade 0/1 qualification matches underhood thermal and transient conditions.
おすすめ
DC Motor and Solenoid Current-Limit Protection
In an actuator drive stage, a shunt plus comparator is the fastest way to detect an overcurrent condition and cut the drive. The LM2903AVQDRG4Q1 compares the amplified shunt voltage against a reference on its non-inverting input, and its low propagation delay lets the trip action respond before the switch or MOSFET exceeds its safe operating area. Two independent channels allow separate limits for two actuators in one 8-SOIC footprint. Because the comparator output is open collector, it can be wired-ORed with a thermal comparator or watchdog into a single hardware shutdown line, guaranteeing that any trip disables the driver. The 36 V supply ceiling also permits the comparator to sit on the same bus as a 24 V actuator rail.
おすすめ
Industrial PLC Level and Limit Switching
A tank level probe or a pressure switch presents a slow, noisy analog voltage that a PLC input cannot interpret reliably. The LM2903AVQDRG4Q1 converts that analog level into a hard logic transition by comparing it against a setpoint, with the open-collector output driving a PLC digital input through a pull-up resistor so the interface stays galvanically simple and robust. The two channels let one probe produce both a high-level and a low-level alarm, giving hysteresis without extra components. Wide supply tolerance to 36 V means the same device can be powered from a 24 V industrial control rail, while the low, supply-independent quiescent current keeps module loading negligible when many channels are wired to the same bus.
おすすめ
Power Supply UVLO and OVLO Window Comparator
A robust DC/DC or AC/DC module needs its output held off until the input rail is inside a safe window. The LM2903AVQDRG4Q1 implements a two-threshold window using its two independent channels, one detecting undervoltage and the other overvoltage, with the outputs wired-ORed so the enable node is pulled low whenever the input is out of range. Because the outputs are open collector, a single pull-up resistor plus an external logic gate forms a clean active-low enable, and the design stays immune to the supply condition it is monitoring. The wide 36 V supply range lets the comparator operate from the same high-voltage rail it supervises, reducing the number of rails a telecom or industrial supply board needs.
おすすめ
Consumer and Appliance Threshold Detection
Appliances and household electronics constantly compare slow analog sense lines against fixed thresholds, for example a refrigerator defrost sensor, a kettle temperature probe, or a washing machine water level input. The LM2903AVQDRG4Q1 handles two such decisions in a single 8-SOIC package, and its open-collector output can drive a relay driver stage or directly sink an LED through a pull-up resistor without needing a push-pull output stage. Supply operation up to 36 V gives design headroom for 24 V appliance bus systems, while the supply-independent low quiescent current keeps standby drain small in devices that spend most of their life in a low-power state.
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: LM2903AVQDRG4Q1 — 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 | LM2903AVQDRQ1 | LM2903AVQDRG4 | LM2903DR | LM393ADR | LM2903YDT |
|---|---|---|---|---|---|---|
| Package | 8-SOIC (D) | 8-SOIC (D) - same | 8-SOIC (D) - same | 8-SOIC (D) - same | 8-SOIC (D) - same | 8-SOIC (D) - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | onsemi |
| Number of Channels | 2 independent | 2 independent | 2 independent | 2 independent | 2 independent | 2 independent |
| Output Type | Open-Collector | Open-Collector | Open-Collector | Open-Collector | Open-Collector | Open-Collector |
| Single Supply Voltage Range | 2 V to 36 V | 2 V to 36 V | 2 V to 36 V | 2 V to 36 V | 2 V to 36 V | 2 V to 36 V |
| Dual Supply Voltage Range | +/-1 V to +/-18 V | +/-1 V to +/-18 V | +/-1 V to +/-18 V | +/-1 V to +/-18 V | +/-1 V to +/-18 V | +/-1 V to +/-18 V |
| AEC-Q100 Grade | Grade 0 and Grade 1 | Grade 0 and Grade 1 | Not automotive qualified | Not automotive qualified | Not automotive qualified | Not documented as AEC-Q100 Grade 0/1 |
主な差別化要因
- AEC-Q100 Grade 0 and 1 automotive qualification with a -40 °C to +125 °C ambient range （vs LM2903DR)
- Wide 36 V single-supply headroom removes the need for an input attenuator （vs LM393ADR)
- Two fully independent channels in one 8-SOIC package （vs LM2902DR)
- Supply-independent low quiescent current of about 0.4 mA per channel （vs LM2903YDT)
設計ノート
Do not assume the open-collector output can pull a logic line low on its own. A pull-up resistor, typically 10 kΩ to 100 kΩ, must be fitted, and the high-state level is set by that resistor fighting the output leakage current. If the pull-up is too large, the output may never reach a valid logic high at temperature; if it is too small, the sinking comparator can exceed its output current rating. Check both the output leakage current and the output sink current limit in the LM2903-Q1 datasheet before fixing the resistor value for your pull-up voltage and cable length.
The differential inputs are high impedance and are the dominant source of false threshold transitions in this design. Route the inverting and non-inverting traces as a tight differential pair directly from the sensing node to pins 2/3 or pins 5/6, and keep them well away from switching nodes, relay contacts and inductor windings. Place the input divider resistors immediately adjacent to the comparator pins so that their node is short and shielded by surrounding ground. On an 8-SOIC footprint the two channels sit at opposite ends of the package, so place channel 1 close to its source and channel 2 close to its own source rather than routing both across the board.
Estimated: with a 24 V automotive bus at the 36 V absolute maximum minus a 2 V margin, and both channels simultaneously driving 16 mA into a 10 kΩ pull-up network, the comparator dissipation is dominated by the internal drop across the output stage rather than by quiescent current, while the 0.4 mA per channel quiescent draw contributes about 0.008 W of bias power per channel at 24 V. In practice the dominant losses in this topology come from the pull-up network, not the IC. Confirm the absolute maximum supply voltage and total package power dissipation in the manufacturer datasheet, and keep a 10 V margin below the 36 V rating for load-dump and transient headroom.
In a 24 V vehicle the comparator inputs often sit at high common-mode voltage referenced to the battery, so any injected noise appears directly as a threshold error. If the source node is slow and noisy, add hysteresis with a positive feedback resistor from the output to the non-inverting input; note that this is only possible on the open-collector output because it can source current through the feedback resistor. Keep the hysteresis resistor value high enough not to interfere with the intended threshold, and verify the resulting trip points over the full -40 °C to +125 °C range.
コンプライアンス情報
The manufacturer lists the LM2903-Q1 as an AEC-Q100 Grade 0 and 1 qualified automotive high voltage dual differential comparator. RoHS, REACH, halogen-free and conflict-minerals declarations are issued per ordering code through the manufacturer's compliance process; request the current material declaration and certificates for LM2903AVQDRG4Q1 through the Request a Quote form on this page.
