LM2903VQDRQ1 - 36V Dual Automotive Comparator | Texas Instruments
MPN: LM2903VQDRQ1 ✓ AktifLM2903VQDRQ1 Ringkasan
A comparator is a differential amplifier whose output indicates whether its non-inverting input is above or below its inverting input. The LM2903VQDRQ1 belongs to the comparator hierarchy within analog and mixed-signal integrated circuits. Its high-voltage supply tolerance and automotive qualification make it suitable for monitoring 12 V and 24 V vehicle electrical systems, where input signals can exceed conventional logic supply levels.
The LM2903VQDRQ1 supports single-supply operation from 2 V to 36 V or dual-supply operation from ±1 V to ±18 V. Each channel includes an inverting input, a non-inverting input, and an open-collector output. The open-collector architecture requires an external pull-up resistor and permits the output to be pulled up to a logic voltage different from the comparator supply. Supply-current drain is specified as 0.4 mA, supporting low-power monitoring systems.
The differential input-voltage range extends to the maximum-rated supply voltage, while the common-mode input range includes ground. These characteristics support threshold detection, overvoltage and undervoltage detection, sensor conditioning, and automotive signal monitoring. The open-collector outputs can sink external-device current when the comparison state is active, while the pull-up network establishes the inactive high state. A typical propagation delay of approximately 1.3 µs is appropriate for general-purpose control rather than high-speed edge detection.
Typical uses include battery-pack protection, automotive power-rail supervision, industrial control thresholds, window and sensor-limit comparisons, and interface logic for open-collector buses. In vehicle systems, the wide supply range allows a comparator to operate directly from protected battery-related rails when the preceding circuit provides suitable transient protection. In process-control equipment, the comparator can supervise a transducer signal and provide a pulled-up logic indication to a controller.
Design the pull-up resistor to balance output rise time, switching current, power consumption, and the sink-current rating of the open-collector output. Keep the two comparison channels independent even when they share the supply pins. Provide stable supply decoupling close to the device, route sensitive input traces away from switching nodes, and use the manufacturer's pin-description table when assigning PCB tracks. Automotive implementations should also include the transient-protection and layout measures required by the completed vehicle interface.
This product page combines the exact ordering information, manufacturer specifications, pin arrangement, drop-in replacement analysis, application guidance, and engineering design notes needed to evaluate the LM2903VQDRQ1 before it is assigned to a PCB or placed on a bill of materials.
Alternatif penggantian untuk LM2903VQDRQ1 — paket yang sama, pin-pada-pin kompatibel. Bagian paket yang berbeda memerlukan kerja ulang PCB diabaikan.
Variasi di dalam seri ini
Model-series yang sama yang kompatibel dengan penggantian LM2903VQDRQ1 (sama faktor bentuk dan footprint) — berbeda di dalam Package, Operating Temperature Range, Output Type, Comparator Type, Channel Independence.
LM2903AVQDRQ1
✅ Drop-InKontak untuk harga
Lihat Datasheet →LM2903QDR
✅ Drop-In📋 Alternatif referensi (tidak dalam katalog)
LM2903DR
✅ Drop-InKontak untuk harga
Lihat Datasheet →LM393ADR
✅ Drop-InKontak untuk harga
Lihat Datasheet →LM2903VQDR
✅ Drop-In📋 Alternatif referensi (tidak dalam katalog)
LM2903VQDRQ1 Rating Maksimal & Karakteristik Listrik
| Comparator Type | Dual differential comparator |
| Number of Channels | 2 channels |
| Tipe Output | Open-collector |
| Supply Voltage Range, Single Supply | 2 V to 36 V |
| Supply Voltage Range, Dual Supply | ±1 V to ±18 V |
| Differential Input Voltage Range | Up to maximum-rated supply voltage |
| Common-Mode Input Voltage Range | Includes ground |
| Supply-Current Drain | 0.4 mA |
| Propagation Delay | Approximately 1.3 µs |
| Logic Compatibility | TTL, MOS, and CMOS compatible |
| Automotive Qualification | AEC-Q100 Grade 0 and Grade 1 |
| Rentang Suhu Kerja | -40 °C to +125 °C |
| Paket | 8-pin SOIC (D) |
| Package Width | 3.90 mm |
| Package Length | 0.154 inch |
| Tipe Mounting | Surface mount |
Konfigurasi Pin LM2903VQDRQ1
| Pin produk 1 | OUT1 — Comparator 1 open-collector output |
| Pin produk 2 | IN1- — Comparator 1 inverting input |
| Pin produk 3 | IN1+ — Comparator 1 non-inverting input |
| Pin produk 4 | GND — Ground reference |
| Pin produk 5 | IN2+ — Comparator 2 non-inverting input |
| Pin produk 6 | IN2- — Comparator 2 inverting input |
| Pin produk 7 | OUT2 — Comparator 2 open-collector output |
| Pin produk 8 | VCC — Positive supply input |
Aplikasi Umum
LM2903VQDRQ1 cocok untuk 6 aplikasis: Automotive Battery Monitoring, 24 V Industrial Control Threshold Detection, Sensor Signal Conditioning, Power-Supply Overvoltage Protection, Open-Collector Interface Logic, Window and Limit Comparators.
Automotive Battery Monitoring
The LM2903VQDRQ1 fits automotive battery and power-rail monitoring because it accepts a 2 V to 36 V single supply and is qualified to AEC-Q100 Grade 0 and Grade 1. Place one channel across the protected battery rail and a precision threshold to detect overvoltage, while the second channel can supervise a regulated auxiliary rail. Its common-mode input range includes ground, supporting ground-referenced sensing. The open-collector output can drive a pulled-up MCU input or fault indicator. A practical design must include input clamping, transient protection, local supply decoupling, and validation for load-dump and inductive-noise conditions.
24 V Industrial Control Threshold Detection
The LM2903VQDRQ1 is useful for detecting a threshold in a protected 24 V industrial control system because its single-supply rating extends to 36 V and its supply-current drain is 0.4 mA. A divided sensor signal can drive the non-inverting input, while a precision reference establishes the inverting threshold. The resulting open-collector output may be pulled up to the controller logic rail, electrically separating the comparator output voltage from the monitored 24 V supply. Because the common-mode input range includes ground, the circuit can monitor low-side signals. Confirm transient immunity, input protection, and grounding before using it in safety-related control loops.
Sensor Signal Conditioning
The LM2903VQDRQ1 can convert a bipolar or ground-referenced sensor signal into a digital indication suitable for a controller. The sensor signal is applied to one input and a reference voltage to the other, allowing the comparator to resolve when the measured quantity crosses a selected threshold. Its approximately 1.3 µs propagation delay is appropriate for general-purpose sensing rather than timing-critical pulse detection. The open-collector output requires an external pull-up, which provides a defined inactive state and allows several open-collector devices to share a bus when their outputs are not active simultaneously. For noisy analog signals, use filtering close to the input pin and maintain a low-impedance reference source.
Power-Supply Overvoltage Protection
The LM2903VQDRQ1 can implement a hardware overvoltage cutoff around a 12 V or 24 V automotive rail. One comparison channel monitors a scaled supply voltage against a precision threshold and deasserts an enable signal when the limit is exceeded. Its 36 V maximum single-supply rating provides operating margin above a nominal 24 V bus, while the differential input capability supports robust threshold detection. The open-collector output can be pulled up to the logic system rail and connected to a shutdown controller. The design should include separate high-voltage attenuation, transient clamps, hysteresis or filtering as appropriate, and a documented response strategy for the downstream power stage.
Open-Collector Interface Logic
The LM2903VQDRQ1 is appropriate when a wired interface requires an active-low or open-drain signal rather than a push-pull CMOS output. Its two channels can monitor separate digital or analog thresholds, and their open-collector outputs can use a shared pull-up when the connected devices require a common wired signal. This arrangement avoids driving the signal rail directly from the comparator output and allows the pull-up voltage to be selected independently. The approximately 0.4 mA supply-current drain is useful in always-on monitoring systems. The output network must be checked for sink-current capability, pull-up rise time, bus capacitance, and contention between multiple open-collector devices.
Window and Limit Comparators
The two independent LM2903VQDRQ1 channels can implement upper and lower limits for a slow-changing control or measurement signal. The first comparator detects when the signal rises above an upper reference, while the second detects when it falls below a lower reference. Their open-collector outputs can drive separate pulled-up status inputs, LEDs, or a controller input, creating a simple out-of-range indication without a microcontroller performing every comparison. The common-mode range including ground is valuable for systems whose measured signal approaches zero. Add input filtering and appropriate reference decoupling, and verify the exact propagation delay, input offset, and output timing required by the end product.
Data referensi engineering untuk LM2903VQDRQ1 — pembandingan, panduan desain, dan informasi konformitas.
Panduan Pemilihan
Pembandingan dengan Alternatif
| Parameter Umum | Produk Ini | LM2903AVQDRQ1 | LM2903QDR | LM2903DR | LM393ADR | LM2903VQDR |
|---|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | ROHM Semiconductor |
| Package | 8-SOIC (D) | 8-SOIC (D) | 8-SOIC (D) | 8-SOIC (D) | 8-SOIC (D) | 8-SOIC (D) |
| Comparator Channels | 2 channels | 2 channels | 2 channels | 2 channels | 2 channels | 2 channels |
| Output Type | Open-collector | Open-collector | Open-collector | Open-collector | Open-collector | Open-collector |
Diferensiator Kunci
- Automotive grade coverage with the V ordering option (vsLM2903DR)
- Closest documented same-family ordering alternative (vsLM2903AVQDRQ1)
- Wide high-voltage operating range (vsLM393ADR)
Catatan Desain
Connect an external pull-up resistor from each open-collector output to the required logic rail. The resistor value determines output rise time, idle power, and sensitivity to leakage current. Keep the pull-up voltage within the output's permitted range even when it differs from the LM2903VQDRQ1 supply. Place the pull-up close enough to the load or bus to limit capacitive-node effects while retaining a clear return-current path.
Do not interpret the 36 V supply rating as permission to expose inputs to unrestricted 36 V. Verify the common-mode and differential input limits for the selected operating conditions, and add clamping where a monitored automotive or industrial node can experience transients. The open-collector output can sink current but does not source a high level; omitting the pull-up leaves the output state undefined for downstream logic.
Place the supply-decoupling capacitor close to the VCC and GND pins, and route the return directly to the device ground reference. Keep the inverting and non-inverting traces short and separated from switching nodes, relay coils, and high-current switching paths. For automotive or industrial inputs, place protection components near the connector rather than near the comparator so surge current is diverted before entering sensitive traces.
Use a low-impedance reference for threshold inputs and bypass each reference node locally when it is generated by a resistor divider. Avoid routing both comparison channels through a shared sensitive input node unless intentional. The approximately 1.3 µs propagation delay is suitable for general threshold control; verify system timing when the comparator participates in a fast control loop, especially when slow input transitions cause extra propagation delay.
The LM2903VQDRQ1 dissipates little power in a normal dual-supply comparator configuration, but total board power increases when the output pull-up remains active and the comparator continuously sinks current. For sustained high-level output current, check the output sink rating and package heat rise. Do not assume that the -40 °C to +125 °C operating-temperature rating removes the need to verify ambient temperature, copper area, and worst-case supply voltage.
Informasi Konformitas
Texas Instruments identifies LM2903VQDRQ1 as AEC-Q100 Grade 0 and Grade 1 qualified. RoHS, REACH, lead-free, halogen-free, and conflict-minerals status were not explicitly stated in the cited product information.
