LM2903QDG4 - Dual Differential Comparator, 36 V | Texas Instruments
MPN: LM2903QDG4 ✓ AktifLM2903QDG4 Genel Bakış
A differential comparator is an analog interface integrated circuit that compares two input voltages and changes its output state according to their relative polarity. The LM2903 belongs to the comparator hierarchy within analog and mixed-signal integrated circuits, where it bridges low-level sensor or signal voltages to a digital logic domain. Each half of the device can operate independently, allowing two comparisons in one package when the power supplies and input signals share a suitable common range.
The principal features are dual independent comparators, a wide 2 V to 36 V operating range, open-collector outputs, and logic compatibility with TTL, CMOS, and MOS devices. The open-collector architecture gives the output a defined pulled-up state when the output transistor is off and allows multiple open-collector outputs to share a wired bus when suitable, provided each output has its own pull-up path. The operating-temperature grade extends from -40 °C to 125 °C for industrial temperature conditions.
Each comparator uses a differential input stage and an open-collector output stage. A positive differential input produces the corresponding output state, while the magnitude and polarity of the differential input determine switching behavior. Because the outputs are open collector, external pull-up resistors are required for normal TTL or CMOS-compatible operation. The pull-up value controls rise time, power consumption, and susceptibility to bus capacitance, so it must be selected with the driven load and operating speed in mind.
Typical uses include monitoring a sensor threshold, detecting overvoltage or undervoltage conditions, comparing an analog measurement with a reference, and providing an open-collector signal to a microcontroller or logic gate. The wide supply range is useful for industrial control systems, automotive-adjacent sensing circuits, power-supply monitoring, and test equipment where input signals may exceed conventional low-voltage logic rails.
PCB layout should keep the exposed routes short and provide a stable ground reference close to the comparator. Place input and output components according to the manufacturer application guidance, and avoid routing high-current or switching-node copper directly beside the differential inputs. Pull-up resistors should connect to the intended logic supply rather than the comparator supply when separate output-interface voltage is required.
This page combines the manufacturer's device information, package details, operating limits, direct drop-in candidates, comparison parameters, and practical implementation guidance. It also identifies which electrical details require confirmation in the LM2903 family datasheet before production release.
Drop-in alternatifler için LM2903QDG4 — aynı paket, pin-başına uyumlu. PCB yeniden montajı gerektiren farklı paket bileşenleri dışlanmıştır.
Bu Serideki Variantlar
Yedek parça uyumlu olan aynı serideki modeller LM2903QDG4 (aynı form faktörü ve ayağa oturma) — farklı olan Package, Operating Temperature Range, Propagation Delay.
LM2903BIDR
✅ YerleştirmeFiyat için iletişime geçin
Veri Şablonunu Görüntüle →LM2903VQDRG4Q1
✅ YerleştirmeFiyat için iletişime geçin
Veri Şablonunu Görüntüle →LM2903D
✅ Yerleştirme ⚠️ Onaylanmamış ÖzelliklerFiyat için iletişime geçin
Veri Şablonunu Görüntüle →LM2903DG
✅ YerleştirmeFiyat için iletişime geçin
Veri Şablonunu Görüntüle →LM2903VNG
✅ Yerleştirme📋 Katalogda Olmayan Referans Alternatifi
LM2903MX
✅ YerleştirmeFiyat için iletişime geçin
Veri Şablonunu Görüntüle →LM2903QDG4 Maksimum Değerlendirmeler & Elektriksel Özellikler
| Comparator Type | Dual differential comparator |
| Number of Comparator Channels | 2 channels |
| Supply Voltage Range | 2 V to 36 V |
| Dual-Supply Total Voltage Range | 2 V to 36 V |
| Çıkış Türü | Open-collector |
| Logic Compatibility | TTL, CMOS, and MOS compatible |
| Differential Input Type | Differential |
| İşletim Sıcaklığı Aralığı | -40 °C to 125 °C |
| Paket | 8-pin SOIC, 3.90 mm width |
| Montaj Türü | Surface mount |
| Single-Supply Operation | Supported |
| Dual-Supply Operation | Supported |
| Independent Comparators | 2 independent channels |
| Differential Input Voltage Range | ±36 V |
| Output Pull-Up Requirement | External pull-up resistor required |
LM2903QDG4 Pin Yapısı
| Pin 1 | OUT 1 — Open-collector output of comparator channel 1 |
| Pin 2 | IN 1- — Inverting input of comparator channel 1 |
| Pin 3 | IN 1+ — Non-inverting input of comparator channel 1 |
| Pin 4 | GND — Ground connection |
| Pin 5 | IN 2+ — Non-inverting input of comparator channel 2 |
| Pin 6 | IN 2- — Inverting input of comparator channel 2 |
| Pin 7 | OUT 2 — Open-collector output of comparator channel 2 |
| Pin 8 | VCC — Positive power supply |
Tipik Uygulamalar
LM2903QDG4 için uygundur 6 uygulamas: Industrial Sensor Threshold Detection, Power-Supply Overvoltage Monitoring, Microcontroller Interface Conditioning, Battery Voltage Window Detection, Automotive Electrical Signal Conditioning, Test and Measurement Limit Detection.
Industrial Sensor Threshold Detection
The LM2903QDG4 is suitable for comparing a sensor signal with an adjustable reference when the circuit must operate from a 2 V to 36 V supply. One differential input receives the sensed voltage while the other receives the threshold, and the open-collector output changes state as their relationship crosses the comparison point. An external pull-up connects the output to the required logic rail. Its -40 °C to 125 °C grade supports industrial temperature conditions, but input common-mode limits and transient protection must be checked against the sensor output range.
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Power-Supply Overvoltage Monitoring
The LM2903QDG4 can monitor a power rail by comparing a divided voltage against a reference and producing an open-collector fault indication. The wide 2 V to 36 V supply range permits use near industrial and distributed power systems, while the open-collector output can drive a wired-OR fault bus when each output has an appropriate pull-up. Because the comparison inputs can also see substantial differential voltage, use resistor dividers and clamping networks that keep both inputs within the manufacturer's absolute-maximum and common-mode limits.
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Microcontroller Interface Conditioning
The LM2903QDG4 converts an analog threshold decision into a digital signal for a microcontroller input. Place the measured voltage and reference on the two inputs of one comparator, add the required open-collector pull-up to the microcontroller's logic supply, and route the result to a general-purpose input. TTL, CMOS, and MOS compatibility supports common logic families. The 8-pin SOIC package also provides two independent channels for redundant or dual-threshold decisions, while short PCB traces help preserve the accuracy of the common-mode input measurement.
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Battery Voltage Window Detection
The LM2903QDG4 can implement upper and lower battery-voltage limits by using its two independent differential comparator channels. Each channel compares a resistor-divided battery voltage with a corresponding reference and provides an open-collector state for the charger, load switch, or monitoring controller. The device's broad single-supply range supports systems operating above low-voltage logic rails. Pull-up resistors should be referenced to the digital system supply, and the divider tolerances must be included in the overvoltage and undervoltage threshold calculations.
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Automotive Electrical Signal Conditioning
The LM2903QDG4's wide supply range and -40 °C to 125 °C operating grade make its architecture relevant to automotive electrical monitoring, although the exact LM2903QDG4 qualification status must be confirmed for production automotive use. It can compare a conditioned vehicle signal with a reference and provide an open-collector output to another controller. The LM2903VQDRG4Q1 is the automotive-oriented comparison candidate when the required qualification is appropriate. Regardless of grade, protect inputs against automotive transients and route high-current paths away from the comparator.
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Test and Measurement Limit Detection
The LM2903QDG4 can serve as a fast threshold element in bench instrumentation that converts an adjustable test point into a binary limit indication. Its two differential channels support over-limit and under-limit checks, while the open-collector output can drive a front-panel indicator or test-fixture input with an appropriate pull-up. Operation across a 2 V to 36 V supply range allows the comparator to be used near higher-voltage analog sections. For precision measurements, account for input offset, input bias current, and resistor tolerance rather than treating the switching point as ideal.
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Önerilen Ürünler Özeti
Mühendislik referans verileri: LM2903QDG4 — karşılaştırma, tasarım rehberi ve uyumluluk bilgileri.
Seçim Kılavuzu
Alternatiflerle Karşılaştırma
| Parametre | Bu Ürün | LM2903B | LM2903VQDRG4Q1 | LM2903DG | LM2903VNG |
|---|---|---|---|---|---|
| Package | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | onsemi | onsemi |
| Comparator Channels | 2 independent channels | 2 independent channels | 2 independent channels | 2 channels | 2 channels |
| 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 |
| Output Type | Open-collector | Open-collector | Open-collector | Open-collector | Open-collector |
Ana Farklılayıcılar
- Broader differential-input range for the improved family version (karşılaştırma:LM2903B)
- Two independent channels in one compact package (karşılaştırma:LM2903DG)
- Automotive-oriented family alternative with comparable supply operation (karşılaştırma:LM2903VQDRG4Q1)
Tasarım Notları
Route the differential inputs as a compact, balanced pair over a continuous ground plane, and keep them away from switching nodes, inductors, and high-current return paths. Place the external pull-up resistor close to the open-collector output so its rise-time current has a short return path. The two comparator channels are independent, but sharing their supply and ground pins makes the ground reference particularly important: return current from one channel can otherwise disturb the threshold seen by the other channel.
In single-supply operation, connect VCC to the positive rail and GND to ground while respecting the 2 V to 36 V supply range. In dual-supply operation, the total voltage between the supplies must remain within 2 V to 36 V. Do not treat the supply-range limit as an input-range limit; independently verify each differential and common-mode input against the manufacturer absolute-maximum table, particularly when sensing industrial or automotive waveforms.
An open-collector output does not actively drive a valid high level, so every output must have an appropriate pull-up unless the output is intentionally used as a wired-OR node. Choose the pull-up supply to match the receiving logic family and select its resistance from the required rise time, capacitance, and power budget. Avoid using the comparator supply as the pull-up supply when the downstream logic uses a different voltage domain.
Do not substitute a comparator solely because it is also an 8-pin SOIC. Confirm the numbered pin functions, output polarity, input offset, common-mode range, propagation delay, supply restrictions, and temperature grade against the manufacturer datasheet. This is especially important when moving between Texas Instruments and onsemi LM2903 variants, because package identity alone does not guarantee identical threshold behavior or qualification.
Uyumluluk Bilgisi
The standard LM2903QDG4 is not established as an AEC-Q100-qualified device in the available manufacturer information. The related LM2903VQDRG4Q1 is identified as a Q1 automotive option. Other compliance fields require confirmation from the current manufacturer product documentation.