LM2903AS-13 - Dual 36V Comparator | Diodes Incorporated
부품 번호: LM2903AS-13 ✓ 활성LM2903AS-13 개요
A voltage comparator is an analog integrated circuit that compares two input voltages and changes its output state when the non-inverting input exceeds the inverting input. The LM2903 belongs to the comparator hierarchy, where a comparator is an interface IC used to translate small analog voltage differences into digital logic levels. Its two channels can compare independent sensor, reference, or feedback signals while sharing a common supply and ground.
The principal electrical features include two independent channels, a 36 V maximum supply-voltage class, low 25 nA typical input bias current, and open-collector outputs capable of sinking 20 mA. The low input bias current reduces disturbance in high-impedance sensing circuits. The open-drain outputs also permit wired-AND behavior when multiple comparator outputs share a pull-up resistor, provided the design respects the voltage and current limits of each device.
The LM2903 can operate from a single supply or from split positive and negative supplies, making it adaptable to legacy industrial and automotive-style signal chains. Because the comparators are independent, one channel can monitor an upper threshold while the other detects a lower threshold. Output-referenced behavior and input common-mode limits must still be checked against the application supply arrangement before the circuit is released.
Typical uses include sensor threshold modules, overvoltage and undervoltage detection, window comparators, relay-driver interfaces, industrial control logic, and waveform crossing detection. The low input bias current is particularly useful when the input source has a high equivalent resistance or when the comparator must avoid loading a sensor output. A suitable pull-up resistor is required for each open-collector output when the output must drive a high logic state.
The main design consideration is the relationship between supply voltage, input common-mode range, and output pull-up voltage. Keep the pull-up resistor high enough to limit channel current but low enough to achieve the required rise time. Check that the pull-up voltage remains within the output transistor rating and that parasitic PCB capacitance does not slow switching. The 8-pin SOIC footprint also requires adequate copper area and thermal clearance when operating at elevated ambient temperatures.
This page combines device specifications, pin-level guidance, application-oriented design notes, and clearly qualified drop-in comparisons. It is intended to help engineers evaluate the LM2903AS-13 for PCB reuse, comparator selection, supply compatibility, and threshold-circuit implementation without replacing the need to review the manufacturer datasheet during sign-off.
드롭인 대체품: LM2903AS-13 — 동일 패키지, 핀 호환. PCB 재작업이 필요한 다른 패키지 부품은 제외됩니다.
이 시리즈의 변형
다음과 드롭인 호환되는 동일 시리즈 모델: LM2903AS-13 (동일 폼 팩터 및 풋프린트) — 차이점: Comparator Type, Output Type, Package.
LM2903BIDR
✅ 드롭인가격 문의
데이터시트 보기 →LM2903A
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
LM2903BIDR
✅ 드롭인가격 문의
데이터시트 보기 →LM2903B-Q1
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
BA2903F-E2
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
LM2903AS-13 최대 정격 & 전기적 특성
| Comparator Type | Dual differential voltage comparator |
| Number of Channels | 2 channels |
| Maximum Supply Voltage | 36 V |
| Output Current | 20 mA |
| Typical Input Bias Current | 25 nA |
| Differential Input Voltage | ±18 V |
| 출력 유형 | Open collector/open drain |
| Supply Configuration | Single or split supply |
| 패키지 | 8-pin SOIC |
| 실장 유형 | Surface mount |
| Shipping Package | Tape and reel |
LM2903AS-13 핀 구성
| 핀 1 | OUT1 — Channel 1 open-collector output |
| 핀 2 | IN1− — Channel 1 inverting input |
| 핀 3 | IN1+ — Channel 1 non-inverting input |
| 핀 4 | GND — Ground connection |
| 핀 5 | IN2+ — Channel 2 non-inverting input |
| 핀 6 | IN2− — Channel 2 inverting input |
| 핀 7 | OUT2 — Channel 2 open-collector output |
| 핀 8 | VCC — Positive chip supply voltage |
일반적인 애플리케이션
LM2903AS-13 적합 용도: 6 애플리케이션s: Industrial Sensor Threshold Detection, Overvoltage and Undervoltage Protection, Window Comparator, Relay and Actuator Interfacing, Waveform Crossing Detection, Automotive and Heavy Equipment Control Logic.
Industrial Sensor Threshold Detection
The LM2903AS-13 is appropriate for comparing a sensor-derived voltage with an adjustable reference in industrial monitoring circuits. Its typical input bias current of 25 nA limits the current drawn from a high-impedance sensing network, while the two independent channels can implement upper and lower thresholds. Each channel uses an inverting and non-inverting input and an open-collector output. A pull-up resistor converts the output state into a usable logic voltage, and the circuit should use resistor tolerances that keep the threshold within the required tolerance.
추천
Overvoltage and Undervoltage Protection
The two LM2903AS-13 channels can monitor a supply or signal rail independently for overvoltage and undervoltage conditions. The 36 V supply-voltage class is suitable for industrial rails within that boundary, and the differential input rating reaches ±18 V according to the product listing. The open-collector outputs can drive protection logic or an external switching stage. Protection design must account for the common-mode input range, output-current limit, and the delay introduced by the selected pull-up resistance and downstream logic.
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Window Comparator
A LM2903AS-13 dual comparator can implement a voltage window by using one channel to detect the lower threshold and the other to detect the upper threshold. The low 25 nA typical input bias current is helpful when the monitored node is driven through a high-value divider or a high-impedance sensor. Because the outputs are open collector, separate pull-ups or a suitable logic arrangement can create an out-of-window indication. Verify resistor tolerances and propagation behavior for the required measurement accuracy and response time.
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Relay and Actuator Interfacing
The LM2903AS-13 can convert a control-signal comparison into an open-collector output suitable for driving a relay-driver input, fault latch, or actuator interface. Its 20 mA output-current rating provides a defined sinking capability, but the external transistor or driver must handle the inductive load. A flyback path is required for a relay coil, and the comparator supply must remain within its 36 V class. The open-drain architecture also supports wired-AND fault signaling when multiple outputs share a pull-up.
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Waveform Crossing Detection
The LM2903AS-13 can detect signal crossings by comparing a changing input against a fixed or externally generated reference voltage. The open-collector output supports digital-capture, timer, or interrupt inputs when paired with an appropriate pull-up resistor. The 25 nA typical input bias current is beneficial when the source impedance is high, although the input common-mode voltage must remain within the device's operating range. Choose the pull-up value to balance rise time, power consumption, and the 20 mA output-current limit.
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Automotive and Heavy Equipment Control Logic
The dual LM2903AS-13 architecture is useful for low-level sensing and control functions in heavy equipment, provided the exact ordering code is approved for the target environment. The device operates from a single or split supply and offers two independent channels for redundant comparisons or threshold controls. The 36 V supply class is suitable for many 12 V and 24 V automotive or industrial systems, but transient protection, input clamping, and qualification requirements must be addressed at the board level. Use LM2903B-Q1 when automotive qualification is specifically required.
추천
추천 제품 요약
엔지니어링 참조 데이터: LM2903AS-13 — 비교, 설계 지침 및 규정 준수 정보.
선택 가이드
대체품과의 비교
| 파라미터 | 이 제품 | LM2903 | LM2903A | LM2903B | LM2903B-Q1 | BA2903F-E2 |
|---|---|---|---|---|---|---|
| Package | 8-pin SOIC | 8-pin SOIC | 8-pin SOIC | 8-pin SOIC | 8-pin SOIC | 8-pin SOIC |
| Brand | Diodes Incorporated | Diodes Incorporated | Diodes Incorporated | Texas Instruments | Texas Instruments | Sharp Microelectronics |
| Comparator Channels | 2 channels | 2 channels | 2 channels | 2 channels | 2 channels | 2 channels |
| Output Architecture | Open collector/open drain | Open collector/open drain | Open collector/open drain | Open collector/open drain | Open collector/open drain | Open collector/open drain |
주요 차별점
- Low-bias dual comparator in a standard SOIC-8 footprint (vs BA2903F-E2)
- Expanded differential input range in the B-version replacement (vs LM2903B)
- Automotive-qualified family option without changing the dual SOIC architecture (vs LM2903B)
설계 노트
Use a pull-up resistor on every open-collector output. Calculate its maximum current from the pull-up voltage and resistance, and confirm that it remains below the 20 mA output-current rating. Choose the resistance jointly with the input capacitance and required switching time; a lower resistance produces a faster rising edge but consumes more current and increases cross-coupled noise.
Do not assume that the ±18 V differential input rating makes every input combination safe. Each input must also remain within the comparator's specified common-mode range for the selected supply voltage. Verify supply startup, input overvoltage, and output pull-up voltage against the manufacturer limits before connecting external signals or field-wired nodes.
Place the pull-up resistors close to the two OUT pins and route the open-collector nets away from sensitive analog inputs. Keep comparator input traces short, use a continuous ground reference, and place any input-filtering capacitors close to the corresponding pins. The SOIC-8 footprint offers separation between the two channels, but channel-to-channel crosstalk can still increase when input traces run in parallel for excessive distances.
The LM2903AS-13 is normally used at low dissipation, but the copper area around the SOIC package still affects junction temperature. For sustained high operation near the 36 V supply class, estimate total dissipation from supply current and output duty cycle, then confirm that the PCB thermal resistance keeps the junction below its rated limit. Avoid placing the device beside a heat source with no airflow path.
규정 준수 정보
Compliance declarations require confirmation from the current Diodes Incorporated product documentation or supplier certificates.