LM2903S-13 - Dual 36V Differential Comparator | Diodes
MPN: LM2903S-13 ✓ Hoạt độngLM2903S-13 Tóm tắt
A differential comparator is an analog integrated circuit that compares two input voltages and changes its output state according to their relationship. Within the broader hierarchy of comparator IC, voltage comparator, analog IC, and semiconductor, the LM2903S-13 is intended for general-purpose signal conditioning, threshold detection, and logic-interface applications. Its dual-channel architecture improves board utilization while keeping the two channels electrically independent.
Key features include a 36 V maximum total supply voltage, operation from a single supply or split supplies, and an input common-mode range that includes ground. The open-collector outputs are designed to interface with TTL, MOS, and CMOS logic. Each comparator can drive an external pull-up network, making the device useful when a wired-AND function or level translation is required. The stated 25 nA input bias current supports applications where input bias effects must be controlled.
The LM2903 family uses an open-collector output architecture rather than a push-pull or rail-to-rail CMOS output. When the output transistor is off, the output voltage is set by the pull-up resistor and its connected supply. When the output transistor is on, the output approaches ground while remaining within the device's output-current capability. This architecture provides flexibility in interface voltage, but it also requires an external pull-up resistor and suitable attention to pull-up current.
Typical applications include two-threshold monitoring, zero-cross detection, sensor-signal conditioning, relay or solenoid drive interfaces, window comparators, and general digital logic level translation. The device can also support dual-polarity sensing when powered from split supplies. Its 8-pin SOIC package is convenient for conventional through-hole assembly and hand rework, although modern high-density designs may prefer a smaller surface-mount package when one is qualified.
For reliable operation, keep the total supply voltage within the 36 V rating and observe the absolute maximum input and output limits listed in the manufacturer datasheet. Place the pull-up resistor close to the output net, maintain a continuous ground return, and account for the open-collector output's rise time, which is determined by output capacitance and pull-up resistance rather than by a dedicated push-pull driver.
This product page combines the LM2903S-13 device identity, package details, manufacturer-family information, sourcing references, pin-compatible alternatives, and application-oriented design guidance. It is structured to help engineers evaluate the comparator electrically before deciding whether the 8-pin SOIC implementation matches the assembly, protection, interface, and lifecycle requirements of the target design.
Bộ thay thế dễ dàng lắp đặt cho LM2903S-13 — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
Các biến thể trong loạt này
Các mẫu cùng loạt có thể lắp đặt dễ dàng tương thích với LM2903S-13 (cùng hình factor và footprint) — khác nhau ở Input Bias Current, Output Type, Package.
LM2903BIDR
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →LM2903BIDR
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →LM2903S
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
LM2903BIDR
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →LM2903BIDR
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →LM2903S-13 Tỷ lệ tối đa & tính chất điện
| Comparator Type | Dual differential comparator |
| Number of Channels | 2 channels |
| Maximum Total Supply Voltage | 36 V |
| Supply Voltage Range | ±18 V / 36 V total |
| Output Current | 20 mA |
| Input Bias Current | 25 nA |
| Kiểu đầu ra | Open collector |
| Supply Configuration | Single supply or split supply |
| Hộp | 8-pin SOIC (8-SO) |
| Kiểu lắp đặt | Surface mount |
| Trạng thái RoHS | RoHS |
Hướng dẫn cấu hình chân LM2903S-13 8-pin soic (8-so)
Cấu hình chân cho LM2903S-13 (8-pin soic (8-so) gói). Động cơ điện này có chân cổng, nguồn và đầu ra. Đối với các gói không phân極, tham khảo tài liệu thông số kỹ thuật của nhà sản xuất để biết hướng dẫn chính xác của chân 1 và chi tiết về vân footprint. Các ứng dụng phổ biến bao gồm thiết kế nguồn cung cấp điện, điều khiển động cơ và chuyển đổi tải.
Không có dữ liệu chân cụ thể sẵn có cho LM2903S-13.
Tham khảo: tài liệu kỹ thuật cho cấu hình chân đầy đủ.
Ứng dụng tiêu biểu
LM2903S-13 phù hợp cho 6 Áp dụngs: Dual-Threshold Monitoring, Sensor Signal Conditioning, Zero-Cross Detection, Relay and Solenoid Drive Interface, TTL and CMOS Level Translation, Battery-Powered Monitoring.
Dual-Threshold Monitoring
The LM2903S-13 is well suited to monitoring a signal against two independent limits because it contains two differential comparators in one 8-pin SOIC package. Each channel can compare a measured voltage with a separate reference and provide an open-collector status output. For a 3.3 V or 5 V digital system, pull each output up to the appropriate logic rail, allowing wired-AND behavior when multiple channels feed one controller input. The 36 V total supply capability also provides useful headroom for industrial input networks, although the common-mode input range and absolute maximum limits must be checked against the actual node voltage. Input filtering and hysteresis should be added where noise or slow input transitions could cause repeated output toggling.
Được đề xuất
Sensor Signal Conditioning
The LM2903S-13 can convert a slowly varying sensor signal into a digital indication by comparing the sensor node with a threshold reference. Its two independent channels permit useful arrangements such as upper and lower limits, directional detection, or a redundant comparison of related sensing elements. The 25 nA input bias-current rating is important when the source impedance is high, because bias current produces an offset across that impedance and can shift the apparent comparison point. The open-collector output makes it straightforward to use the comparator as an active-low alarm with a pull-up resistor. Designers should keep the reference divider close to the device, provide adequate bypass capacitance, and add controlled hysteresis to prevent chatter when the measured signal crosses the threshold slowly.
Được đề xuất
Zero-Cross Detection
Both channels of the LM2903S-13 can be used for zero-cross or polarity detection in low-frequency control and measurement circuits. A sinusoidal or bipolar input can be compared against ground or a small reference to generate a logic transition when the waveform changes sign. The comparator family supports single- and split-supply operation, allowing the same architecture to detect crossings in either positive-only or bipolar systems. Because the output is open collector, the transition polarity and pull-up arrangement determine whether the result is active high or active low. Add a controlled input offset or hysteresis to avoid multiple transitions around the zero point, and account for propagation delay when the detected event must be synchronized to another timing circuit.
Được đề xuất
Relay and Solenoid Drive Interface
The LM2903S-13 can provide the logic-side decision stage for a relay, solenoid, or lamp driver while the open-collector output works with an external transistor or suitable pull-up network. The comparator evaluates a control or feedback voltage, and its output state determines whether the downstream driver transistor is on. This arrangement keeps the sensitive decision node separate from the higher-current load. The stated 20 mA output-current capability must be treated as a device limit, while transistor base current, inductive transients, and thermal dissipation belong in the load-stage design. Include flyback protection for inductive loads and size pull-up resistors so that logic current remains within both the comparator and destination-device limits.
Được đề xuất
TTL and CMOS Level Translation
The LM2903S-13 can bridge incompatible logic domains by comparing a shifted or scaled input against a reference and pulling the destination-domain output up through a resistor. Its open-collector output is compatible with TTL, MOS, and CMOS interfaces according to the LM2903 family information, so the pull-up rail can be selected independently of the comparator supply when the electrical limits permit. This makes the device useful in legacy industrial, control, and embedded systems where a modern controller must interpret a legacy signal. The design must ensure that the input common-mode voltage remains valid, the pull-up voltage does not exceed the output limits, and the input and output timing requirements are met. Schmitt-style hysteresis or filtering may be required if the source transitions slowly.
Được đề xuất
Battery-Powered Monitoring
The LM2903S-13 can supervise battery-derived signals because its common-mode input range includes ground during single-supply operation. A pair of comparators can monitor pack voltage and a current-sense signal while operating from a shared supply, reducing the component count compared with two single-channel packages. Open-collector outputs can wake a controller or enable a downstream load through pull-up resistors. The exact battery chemistry and voltage range must be checked against the comparator's supply and input limits, particularly during transient events. Low quiescent demand is a family characteristic intended to support battery operation, but the actual device-specific supply current should be used in the complete power budget. Reverse-battery protection, surge filtering, and a stable low-noise reference remain external design requirements.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho LM2903S-13 — so sánh, hướng dẫn thiết kế và thông tin tuân thủ.
Hướng dẫn chọn lựa
So sánh với các sản phẩm thay thế
| Tham số | Sản phẩm này | LM2903 | LM2903B | LM2903S | LM2903 | LM2903BIDR |
|---|---|---|---|---|---|---|
| Brand | Diodes Incorporated | Diodes Incorporated | Texas Instruments | onsemi | 3PEAK | Texas Instruments |
| Package | 8-pin SOIC | 8-pin SOIC | 8-pin SOIC | 8-pin SOIC | 8-pin SOIC | 8-pin SOIC |
| Comparator Configuration | Dual differential comparator | Dual differential comparator | Dual differential comparator | Dual differential comparator | Dual differential comparator | Dual differential comparator |
| Output Type | Open collector | Open collector | Open collector | Open collector | Open collector | Open collector |
| Input Common-Mode Range | Includes ground | Includes ground | Includes ground | Includes ground | Includes ground | Includes ground |
| Special Characteristics | Standard LM2903 family | Standard LM2903 family | Lower offset, lower bias current, lower propagation delay, improved ESD performance | LM2903S dual-comparator family | LM2903 dual-comparator family | B-version performance with 8-pin SOIC ordering suffix |
Bảo phân biệt quan trọng
- Established Diodes Incorporated dual-comparator sourcing (vsLM2903B)
- Ground-inclusive input operation (vsLM2903S)
- Open-collector interface flexibility (vsLM2903)
Ghi chú thiết kế
Do not treat an open-collector output as a push-pull output. Every LM2903S-13 output requires a pull-up resistor, and that resistor must connect to a voltage compatible with the downstream logic. Confirm that the pull-up current at the low output state stays within the device's 20 mA output-current capability. A pull-up that is too small can overload the output, while one that is too large increases output rise time and can allow slower logic nodes to see a non-valid transition.
Place each pull-up resistor close to its corresponding LM2903S-13 output and the receiving logic input. Keep the comparator, reference components, and decoupling capacitor in a compact area so that the sensitive input traces remain short. Use a continuous ground plane and connect the device ground pin directly to it. For long input traces, add a local input clamp or RC filter close to the comparator, while ensuring that added capacitance does not slow the intended response excessively.
Use intentional hysteresis when a noisy or slowly changing input can cross the reference multiple times. A positive-feedback resistor can create separated switching thresholds, but its value must be calculated together with the reference-source impedance. Also check the source impedance against the 25 nA input bias-current rating: bias current multiplied by source impedance creates an input-offset error. Stable references and short, guarded traces are generally more effective than increasing comparator gain, which the LM2903 does not provide.
Thông tin tuân thủ
The LM2903S-13 PDF listing identifies the part as RoHS compliant. No additional REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals declaration was established for this exact ordering suffix.
