LM2903FVT-E2 Dual Ground-Sense Comparator | ROHM
MPN: LM2903FVT-E2 ✓ Hoạt độngLM2903FVT-E2 Tóm tắt
A comparator is an analog integrated circuit that evaluates one input voltage relative to another and changes its output state when the relationship between those voltages crosses a defined threshold. The LM2903 series belongs to the broader open-collector comparator hierarchy, which combines analog signal conditioning, threshold detection, and digital-compatible output signaling. Ground-sense operation is particularly useful when the reference or monitored signal is referenced to the system ground rather than to a mid-supply rail.
The principal features of the LM2903FVT-E2 include two comparator channels, a wide 3 V to 32 V supply range, low supply current, and open-collector outputs. The open-collector architecture allows the output transition speed to be influenced by an external pull-up resistor and load capacitance. This flexibility makes the device suitable for wired logic, relay or solenoid interfaces, threshold monitoring, and systems where the pull-up voltage must be selected independently from the comparator supply.
The wide operating-voltage range allows the comparator to operate from low-voltage 3 V systems through substantially higher supply rails, subject to the absolute maximum ratings and application conditions defined by the manufacturer. Because each channel uses an open-collector transistor, an external pull-up resistor is required to establish a valid high output level. The pull-up voltage, resistor value, allowable sink current, and rise time should be selected together according to the required operating frequency and connected load.
Typical applications include automotive and industrial control modules, battery-powered equipment, overvoltage and undervoltage detection, sensor-threshold conditioning, window or level detection, and general digital control systems. The low supply-current characteristic is particularly relevant to systems that maintain operation across a broad supply range without continuously operating from a tightly regulated rail. The TSSOP-B package supports compact layouts, although careful PCB planning remains necessary for clean signal routing.
For reliable implementation, connect the required pull-up resistor to the pull-up supply, keep comparator input traces short, and avoid routing high-current or fast-switching paths near the input pins. Confirm the input common-mode limits, differential input limits, output current, and supply decoupling requirements against the manufacturer datasheet for the selected automotive and temperature grades before production release.
This product record combines the manufacturer product description with distributor packaging information and practical guidance for comparator implementation, PCB integration, output pull-up design, and drop-in replacement assessment. It also distinguishes verified ordering information from engineering assumptions so engineers can review the circuit and manufacturing implications before selecting a comparator for a new design.
Bộ thay thế dễ dàng lắp đặt cho LM2903FVT-E2 — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
Không có bộ thay thế dễ dàng lắp đặt sẵn có cho sản phẩm này.
Yêu cầu các bộ thay thếLM2903FVT-E2 Tỷ lệ tối đa & tính chất điện
| Comparator Type | Dual ground-sense comparator |
| Number of Channels | 2 channels |
| Operating Voltage Range | 3 V to 32 V |
| Kiểu đầu ra | Open collector |
| Điện áp cung cấp | Low supply current; exact value not stated |
| Hộp | 8-TSSOP-B |
| Package Pin Count | 8 pins |
| Kiểu lắp đặt | Surface mount |
| Shipping Format | Tape and reel |
| Product Category | Standard general-purpose comparator |
| Comparator Class | Ground-sense comparator |
| Pull-Up Requirement | External pull-up resistor required for open-collector output |
| Trạng thái RoHS | unknown |
| REACH Status | unknown |
Hướng dẫn cấu hình chân LM2903FVT-E2 8 pins
Cấu hình chân cho LM2903FVT-E2 (8 pins gói). Thành phần số hiệu này có chân đầu vào, đầu ra và nguồn cung cấp. Tham khảo tài liệu thông số kỹ thuật của nhà sản xuất để biết cấu hình chân bù, bù trừ và chân kích hoạt. Hoàn hảo cho điều kiện tín hiệu và mạch khuếch đại.
Không có dữ liệu chân cụ thể sẵn có cho LM2903FVT-E2.
Tham khảo: tài liệu kỹ thuật cho cấu hình chân đầy đủ.
Ứng dụng tiêu biểu
LM2903FVT-E2 phù hợp cho 6 Áp dụngs: Automotive Ground-Sense Detection, Industrial Overvoltage Monitoring, Battery-Powered Equipment, Sensor Signal Conditioning, Relay and Solenoid Interface, Portable and IoT Threshold Control.
Automotive Ground-Sense Detection
The LM2903FVT-E2 fits ground-referenced threshold detection in automotive and industrial control electronics because it provides two independent comparator channels across a 3 V to 32 V operating range. Each channel can evaluate a sensor or divided signal against ground without requiring a mid-supply reference. The open-collector output can trigger a discrete logic input through a pull-up resistor, while the TSSOP-B package supports compact controller layouts. Before deployment, verify the exact automotive qualification, temperature grade, input common-mode range, and output limits for the target vehicle platform.
Được đề xuất
Industrial Overvoltage Monitoring
The LM2903FVT-E2 can serve as an overvoltage or abnormal-level detector when a protected signal is scaled and compared with a ground-based threshold. Its two-channel architecture allows one device to monitor two related conditions, while the 3 V to 32 V supply range accommodates widely distributed industrial control rails. Use the open-collector output with an external pull-up so the fault signal can directly enter a controller, relay driver, or safety-monitoring interface. Account for transient protection, input bias effects, and the comparator's actual propagation behavior at the selected threshold and temperature.
Được đề xuất
Battery-Powered Equipment
The low-supply-current characteristic and broad operating range make the LM2903FVT-E2 relevant to battery-powered equipment that must continue monitoring voltage as the source changes. One channel can supervise a divided battery signal and the other can monitor another ground-referenced threshold or wake condition. The open-collector output permits a low-current pull-up arrangement, helping the interface remain compatible with low-power control logic. Designers should still calculate the pull-up's static consumption, confirm the comparator's own supply-current limits, and validate the input range across the complete battery discharge and recharge profile.
Được đề xuất
Sensor Signal Conditioning
The LM2903FVT-E2 is suitable for conditioning slow sensor outputs that are expressed relative to ground and require a clean binary transition. Two channels can compare a sensed level and a reference signal, enabling simple present-versus-absent, above-limit, or below-limit decisions. Its open-collector output can be pulled up to the receiving logic rail, avoiding a fixed internal high-side architecture and allowing flexible interface voltage selection. For noisy or high-impedance sensor nodes, use suitable filtering, maintain short input routing, and confirm the comparator's offset and bias-current effects in the signal chain.
Được đề xuất
Relay and Solenoid Interface
The LM2903FVT-E2 open-collector output can provide a low-side transition for relay, solenoid, or other discrete-driver stages when paired with the appropriate external pull-up and drive circuitry. Its dual channels allow two independent ground-sense decisions, such as an enable condition and a fault condition. The broad 3 V to 32 V operating range supports control systems with multiple supply conditions, but the open-collector transistor must remain within its specified sink-current and thermal limits. Include a flyback path for inductive loads and keep high-current switching loops physically separated from the comparator inputs.
Được đề xuất
Portable and IoT Threshold Control
The dual-channel LM2903FVT-E2 can implement compact threshold decisions in portable equipment and IoT controllers where board area is constrained and supply conditions vary. One channel may detect a low-battery or input-limit condition, while the other evaluates a sensor or mode-control signal referenced to ground. The TSSOP-B package provides a compact surface-mount implementation, and the open-collector outputs allow pull-ups to the host's logic voltage. Power-conscious designs should account for pull-up leakage and switching activity, while firmware owners should confirm hysteresis or external threshold behavior needed to prevent repeated output toggling.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho LM2903FVT-E2 — 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 |
|---|---|
| Brand | ROHM Semiconductor |
| Package | 8-TSSOP-B |
| Comparator Channels | 2 channels |
| Comparator Type | Ground-sense comparator |
| Operating Voltage Range | 3 V to 32 V |
| Output Type | Open collector |
| Supply Current | Low supply current; exact value not stated |
| Mounting Type | Surface mount |
Bảo phân biệt quan trọng
- Wide operating range supports voltage-diverse systems (vsLM2903DR)
- Two ground-sense channels in one package (vsLM2902DR)
- Output voltage is set by the external pull-up (vsLM2903FV-E2)
Ghi chú thiết kế
Do not treat the open-collector output as actively driven high. Every channel requires a pull-up resistor to a suitable logic rail, and the receiving device must tolerate the selected pull-up voltage. Select resistance from both the required sink current and the required rise time; excessive resistance can slow the edge, while an overly aggressive pull-up can exceed the comparator's sink-current capability or increase switching noise.
Place the pull-up resistor close to the corresponding output pin and keep input and output routing compact. Route ground-referenced sensing traces away from relay coils, motor phases, high-voltage switching nodes, and their return-current paths. Maintain a stable ground reference near the device because the two channels compare ground-related signals; shared ground disturbance can shift the switching point and appear as an input fault.
Decouple the comparator supply locally with the capacitance and placement specified by the manufacturer. Keep the pull-up supply path separate from noisy loads where practical, because changes in the pull-up rail directly affect output amplitude. In battery-powered systems, include the comparator's continuous supply current and pull-up leakage in the power budget, then verify operation across the intended supply range rather than only at a nominal voltage.
Check threshold accuracy using the actual source impedance, input bias current, offset behavior, and any hysteresis network. Long or high-impedance input traces can couple switching noise into the decision point. For slow signals, add filtering only after evaluating whether the filter interacts with the intended response time; for fast events, verify propagation delay and output rise time rather than relying on nominal logic-family expectations.
Thông tin tuân thủ
Compliance attributes were not stated on the manufacturer product description or distributor records reviewed for this record. Verify RoHS, REACH, automotive qualification, terminal-finish, halogen, and conflict-mineral status in current manufacturer documentation before procurement.
