LM2903YQ3T - 36V Dual Comparator | STMicroelectronics
Артикул: LM2903YQ3T ✓ АктивенLM2903YQ3T Обзор
A voltage comparator is a semiconductor device that compares two input voltages and changes its output state when one input crosses the other. The LM2903 belongs to the comparator hierarchy, which includes general-purpose comparators, differential comparators, and analog interface ICs. Its dual-channel architecture lets one device perform two independent threshold decisions, reducing component count in industrial control, automotive electronics, and low-power monitoring systems.
Key characteristics include a wide single-supply operating range of 2 V to 36 V, dual-supply operation from ±1 V to ±18 V, and very low supply current of 0.4 mA. The typical input bias current is 25 nA, while the typical input offset current is ±5 nA. The open-collector outputs support wired-AND arrangements and require an external pull-up when the comparator must drive a logic input. Automotive-grade versions of this device family are associated with AEC-Q100 qualification.
The two internal comparators are electrically independent, allowing separate signal paths within the same package. Rail-to-rail input behavior and low input bias current are useful when sensing source voltages that vary close to either supply rail. The low supply current also reduces power consumption in battery-powered systems, although propagation delay and output pull-up selection remain important when switching speed is critical.
Typical applications include automotive battery and power-rail monitoring, industrial sensor threshold detection, overvoltage and undervoltage protection, window-comparator circuits, and logic-level translation between analog sensing nodes and digital control circuits. Its 2 mm × 2 mm DFN8 package supports compact board layouts when adequate copper area and controlled assembly are available.
Designers should verify the complete pin assignment and exposed-pad requirements in the manufacturer datasheet before layout. Place input and output components close to their associated pins, provide a suitable pull-up for each open-collector output, and use stable reference sources when threshold accuracy matters. Confirm that signal amplitudes, common-mode range, supply limits, and automotive qualification requirements suit the target circuit.
This product page consolidates the manufacturer electrical characteristics, package details, verified sourcing links, practical application guidance, and drop-in-replacement assessment. It also highlights the key limitation that a replaceable device must match both the 8-DFN footprint and pin behavior, rather than merely offering similar comparator performance.
Аналоги без доработки для LM2903YQ3T — тот же корпус, pin-to-pin совместимость. Компоненты в других корпусах, требующие переработки PCB, исключены.
Для этого товара нет аналогов без доработки.
Запросить аналогиLM2903YQ3T Максимальные параметры и электрические характеристики
| Comparator Type | 2 independent low-power voltage comparators |
| Single-Supply Voltage Range | +2 V to +36 V |
| Dual-Supply Voltage Range | ±1 V to ±18 V |
| Typical Supply Current | 0.4 mA |
| Comparator Power at +5 V | 1 mW per comparator |
| Typical Input Bias Current | 25 nA |
| Typical Input Offset Current | ±5 nA |
| Тип выхода | Open-collector |
| Input Common-Mode Behavior | Rail-to-rail |
| Number of Channels | 2 |
| Корпус | 8-DFN (2 mm × 2 mm) |
| Package Type | DFN8 with wettable flanks |
| Тип монтажа | Surface mount |
| Automotive Qualification | AEC-Q100 |
Конфигурация выводов LM2903YQ3T
| Контакт 1 | OUT1 — Comparator 1 open-collector output |
| Контакт 2 | IN1- — Comparator 1 inverting input |
| Контакт 3 | IN1+ — Comparator 1 non-inverting input |
| Контакт 4 | V- — Ground or negative supply connection |
| Контакт 5 | IN2+ — Comparator 2 non-inverting input |
| Контакт 6 | IN2- — Comparator 2 inverting input |
| Контакт 7 | OUT2 — Comparator 2 open-collector output |
| Контакт 8 | V+ — Positive supply connection |
Типичное применение
LM2903YQ3T подходит для 6 применениеs: Automotive Battery Threshold Monitoring, Industrial Sensor Limit Detection, Power-Supply Overvoltage Protection, Battery-Powered Equipment Monitoring, Window Comparator Control, Digital Logic Interface.
Automotive Battery Threshold Monitoring
The LM2903YQ3T is suitable for monitoring a vehicle battery or protected power rail because its two independent channels can compare separate system voltages against reference thresholds. The 2 V to 36 V single-supply capability covers a broad range of vehicle electrical environments, while the typical 0.4 mA supply current limits control-circuit overhead. Each open-collector output can drive a pull-up and status input or combine with an external network to flag abnormal conditions. The AEC-Q100 identification should be confirmed against the exact order code and production documentation before automotive release.
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Industrial Sensor Limit Detection
The LM2903YQ3T can implement dual-channel over-limit and under-limit detection for industrial sensors. Its rail-to-rail input behavior helps evaluate signals near the supply range, while the low typical input bias current of 25 nA limits disturbance to high-impedance sensing nodes. One channel can monitor a process signal and the other can supervise a reference or supply condition. Because the outputs are open collector, suitable pull-up resistors translate the results into logic levels without adding another active buffer stage.
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Power-Supply Overvoltage Protection
The two independent comparators in the LM2903YQ3T can supervise a power rail and a secondary auxiliary rail in a compact protection circuit. Each open-collector output can pull a shared enable or fault line low when its monitored input crosses the selected threshold, providing a simple wired-AND arrangement. The 36 V maximum single-supply range supports higher-voltage industrial systems, while the low 0.4 mA typical supply current keeps the supervisory path efficient. External filtering and input clamping should be designed for the actual rail transients and fault conditions.
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Battery-Powered Equipment Monitoring
The LM2903YQ3T fits battery-operated equipment that must detect a low battery, exhausted pack, or out-of-range sensor signal while consuming minimal standby power. Its typical supply current is 0.4 mA across the operating supply range, and the typical input bias current is only 25 nA. Two independent channels can conserve board area by replacing separate single comparators. The open-collector outputs allow direct connection to a microcontroller input with a pull-up, provided the selected pull-up value balances static consumption against transition speed.
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Window Comparator Control
The LM2903YQ3T can implement a window comparator by assigning one channel to the lower threshold and the other to the upper threshold. The open-collector outputs can then be combined or evaluated separately to assert only when the monitored signal lies within the permitted range. This arrangement is useful for battery packs, sensor inputs, and regulated rails. Threshold accuracy depends on the reference circuit and input offset behavior, so the manufacturer characteristics should be checked against the required guard band rather than assuming every boundary is exact.
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Digital Logic Interface
An LM2903YQ3T channel can compare an analog control voltage with a logic threshold and convert the result into an open-collector signal for a digital controller. This is useful when an analog system must drive a host processor, fault controller, or relay-driver input. The wide supply range allows operation from low-voltage logic rails, and the low typical supply current is useful in always-on systems. Select the external pull-up for the receiving logic voltage and verify timing against the required system response rather than relying only on static electrical limits.
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Сводка рекомендуемых товаров
Справочные инженерные данные для LM2903YQ3T — сравнение, рекомендации по проектированию и информация о соответствии.
Руководство по выбору
Сравнение с аналогами
| Параметр | Этот товар |
|---|---|
| Package | 8-DFN (2 mm × 2 mm) |
| Brand | STMicroelectronics |
| Comparator Configuration | Dual, two independent channels |
| Single-Supply Range | +2 V to +36 V |
| Dual-Supply Range | ±1 V to ±18 V |
| Typical Supply Current | 0.4 mA |
| Typical Input Bias Current | 25 nA |
| Typical Input Offset Current | ±5 nA |
| Output Type | Open-collector |
| Automotive Qualification | AEC-Q100 |
Ключевые отличия
- Compact dual-channel footprint (против Conventional SOIC LM2903 variants)
- Wide operating supply range (против Low-voltage CMOS comparator families)
- Low supply demand (против General-purpose comparator families)
- Automotive-grade device identity (против Non-automotive LM2903 order codes)
Заметки по проектированию
Place each input network close to its associated comparator pin and keep the two comparison paths physically separate to reduce coupling between sensitive threshold signals. The open-collector outputs need pull-up resistors; position those resistors near the receiving logic input when rise time matters. For the 2 mm × 2 mm DFN8 package, provide the thermal-pad and wettable-flank geometry shown in the manufacturer package drawing.
Keep comparator input traces short and avoid routing them beside high-current switching nodes. Use a stable reference or threshold source when the output decision must remain stable under supply and temperature changes. Because the outputs are open collector, choose pull-up values from the required sink-current limit and allowable rise time; an excessively large resistance can slow the transition, while an excessively small value increases continuous current.
Do not treat rail-to-rail behavior as permission to exceed the absolute maximum input voltage. Check transients, open-circuit conditions, and external fault voltages on sensor inputs. Also verify whether the application requires the automotive qualification associated with the YQ3 variant, and confirm supply decoupling, exposed-pad assembly, and order-code labeling against the manufacturer documentation before production release.
Информация о соответствии
The part is identified as AEC-Q100 automotive-grade. RoHS, REACH, lead-free, halogen-free, and conflict-minerals declarations were not stated in the cited material and remain unknown.
