LM2903DE4 - Dual 36V Open-Collector Comparator | Texas Instruments
MPN: LM2903DE4 ✓ فعالLM2903DE4 نمای کلی
A comparator is an analog integrated circuit that compares two input voltages and produces a digital logic state indicating which input is higher. Within the broader hierarchy of interface ICs, comparators extend analog signal conditioning into threshold control, protection, sensing, and discrete logic activation. The LM2903DE4 is specifically a dual differential comparator: each half can independently compare an inverting input with a non-inverting input while sharing common supply and ground connections.
The principal features include two independent channels, a 2 V to 36 V supply range, an approximately 300 ns response time, and open-collector outputs compatible with TTL, MOS, and CMOS circuits. The common-mode input range includes ground, and the differential input range is equal to the maximum-rated supply voltage of ±38 V for the family. Each output can sink external current while remaining in a high-impedance state when inactive, requiring an external pull-up resistor for normal logic-high operation.
Differential comparison is especially useful when a sensor or signal source is referenced to another voltage rather than to ground. By placing the threshold on the non-inverting input and the sensed signal on the inverting input, the comparator can provide overvoltage, undervoltage, temperature, current, or level detection. Because the channels are independent, the same package can implement two thresholds, compare two unrelated signals, or combine two decisions locally.
Typical applications include industrial sensor interfaces, overvoltage and reverse-polarity protection, window comparators, motor and relay control, power-supply supervision, and embedded control systems. The open-collector outputs are particularly useful for wired-AND arrangements, relay-driver interfaces, and level translation because the output stage can remain disconnected while an external pull-up establishes the logic-high voltage.
The principal design consideration is the open-collector output. Place each pull-up resistor close to the relevant output and select it to balance rise time against sink-current demand. Also check input common-mode limits, supply operating range, output leakage, and the timing relationship between the reference voltage and sensed signal before using the comparator for high-speed pulse detection.
This page consolidates the manufacturer specifications, package and pin information, orderable alternatives, comparison data, and practical application guidance into a design-focused reference for engineers evaluating the LM2903DE4.
جایگزین‌های drop-in برای LM2903DE4 — همان پکیج، سازگار پین‌به‌پین. قطعات با پکیج متفاوت که نیاز به تغییر PCB دارند مستثنی هستند.
گونه‌ها در این سری
مدل‌های هم‌سری که جایگزین مستقیم هستند برای LM2903DE4 (همان فرم‌فاکتور و فوت‌پرینت) — متفاوت در Output Type.
LM2903D
✅ جایگزین مستقیمبرای قیمت تماس بگیرید
مشاهده دیتاشیت ←LM2902DR
✅ جایگزین مستقیمبرای قیمت تماس بگیرید
مشاهده دیتاشیت ←LM2902DT
✅ جایگزین مستقیمبرای قیمت تماس بگیرید
مشاهده دیتاشیت ←LM2903DE4 حداکثر مقادیر مجاز و مشخصات الکتریکی
| Comparator Type | Dual differential comparator |
| Number of Comparators | 2 channels |
| Supply Voltage Range | 2 V to 36 V |
| Total Supply Voltage Range | 2 V to 36 V |
| Response Time | 300 ns |
| نوع خروجی | Open collector |
| Output Compatibility | TTL, MOS, and CMOS |
| Common-Mode Input Range | Includes ground |
| Differential Input Voltage Range | ±38 V |
| بسته‌بندی | 8-pin SOIC |
| نوع نصب | Surface mount |
پیکربندی پین LM2903DE4
| پین 1 | OUT1 — Comparator 1 open-collector output |
| پین 2 | IN1− — Comparator 1 inverting input |
| پین 3 | IN1+ — Comparator 1 non-inverting input |
| پین 4 | GND — Ground connection |
| پین 5 | IN2+ — Comparator 2 non-inverting input |
| پین 6 | IN2− — Comparator 2 inverting input |
| پین 7 | OUT2 — Comparator 2 open-collector output |
| پین 8 | VCC — Positive supply connection |
کاربردهای معمول
LM2903DE4 مناسب است برای 6 کاربردs: Industrial Overvoltage Detection, Temperature Sensor Thresholding, Power-Supply Window Monitor, Motor and Relay Control, Automotive and Battery-Level Sensing, Sensor Signal Conditioning.
Industrial Overvoltage Detection
The LM2903DE4 fits overvoltage detection because each channel can compare a divided sensor or supply signal against a precision reference. Its 2 V to 36 V supply range supports industrial rails, while the approximately 300 ns response time allows a protection signal to change quickly after a threshold is crossed. Place the divided voltage on the non-inverting input and the reference on the inverting input to create an overvoltage indication. The open-collector output can pull down a fault line or enable a shutdown circuit, with a pull-up resistor establishing the fault-logic voltage. Designers should include input clamping and filtering so switching transients do not create false comparator events.
پیشنهادی
Temperature Sensor Thresholding
The LM2903DE4 can convert an analog temperature-sensor signal into separate high- and low-temperature indications by using its two independent comparator channels. A resistor network establishes the upper and lower thresholds, while the sensor voltage is applied to the appropriate inverting inputs. The 300 ns response time is more than sufficient for typical thermal monitoring, and the 2 V to 36 V supply range supports operation from low-voltage sensor systems through industrial control rails. Open-collector outputs permit wired-AND alarm signaling and interface with MCU inputs through pull-up resistors. Keep the reference network close to the device to reduce noise pickup and verify the sensor output range across the full temperature interval.
پیشنهادی
Power-Supply Window Monitor
پیشنهادی
Motor and Relay Control
The LM2903DE4 is appropriate for motor and relay-control interfaces where a low-voltage sensor or controller signal must reliably energize a higher-current switching stage. The comparator output can serve as an active-low drive into a transistor or relay-driver circuit, while its open-collector architecture provides flexibility over the pull-up voltage. The two independent channels can monitor complementary conditions, such as a start command and an interlock, before allowing a machine to operate. The approximately 300 ns response time minimizes switching delay, and the 36 V maximum supply provides compatibility with many 24 V industrial systems. Add flyback protection at inductive loads and ensure the downstream transistor receives adequate base or gate drive.
پیشنهادی
Automotive and Battery-Level Sensing
The LM2903DE4 can support battery-level sensing, reverse-battery indication, or a simple overvoltage cutoff when its automotive qualification status is confirmed for the exact selected orderable part. Two channels permit separate checks for minimum and maximum battery voltage, and the 2 V to 36 V operating range covers many 12 V and 24 V vehicle systems. The open-collector output can drive a warning lamp, relay, or status line through an external pull-up, while the 300 ns response time supports rapid event detection. Vehicle installations require careful transient suppression, ground-reference design, and electromagnetic compatibility analysis. Confirm the exact temperature grade and qualification status rather than assuming that every member of the family has the same automotive rating.
پیشنهادی
Sensor Signal Conditioning
The LM2903DE4 provides a simple analog-to-logic threshold stage for resistive, inductive, and current-derived sensors. The sensing element and resistor divider establish a voltage that represents the measured condition, and the comparator converts that voltage into a logic level with the polarity chosen by the input assignments. Its 300 ns response time allows the comparator to follow relatively fast sensor transitions, while the 8-pin SOIC package keeps the dual-channel implementation compact. Differential inputs also help when the sensed voltage is referenced to a moving or noisy supply rail. Keep high-impedance input paths short, place the reference network close to the device, and select input filtering based on the sensor bandwidth and required response time.
پیشنهادی
خلاصه محصولات پیشنهادی
داده‌های مرجع مهندسی برای LM2903DE4 — مقایسه، راهنمای طراحی و اطلاعات انطباق.
راهنمای انتخاب
مقایسه با جایگزین‌ها
| پارامتر | این محصول | LM2903D | LM2902DR | LM2902DT |
|---|---|---|---|---|
| Package | 8-pin SOIC | 8-pin SOIC | 8-pin SOIC | 8-pin SOIC |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
تفاوت‌های کلیدی
- Faster stated response time than the related LM2902 comparison candidates (در مقابلLM2902DR)
- Direct same-family pin-compatible option (در مقابلLM2903D)
- Dual independent threshold channels in one package (در مقابلLM2902DT)
یادداشت‌های طراحی
Do not assume that an open-collector output can source a logic-high current. The LM2903DE4 can pull its output low, but a pull-up resistor must connect each output to the required logic rail. Select the resistor using the permitted sink current, output leakage, required rise time, and load capacitance. Leaving these pull-ups disconnected can produce an undefined or slowly rising output transition, particularly when cable capacitance is present.
Keep the reference divider, input-sensing traces, and comparator pins compact and away from switching nodes. Route each input as a short, impedance-controlled path, use a continuous ground plane, and place the device close to its reference network. Differential input pairs are not high-speed differential communications links, but poor grounding can still convert common-mode noise into timing errors or false threshold crossings.
Verify the input common-mode voltage against the actual supply rather than relying only on the 36 V maximum supply rating. The LM2903 family specification identifies a common-mode range that includes ground and a differential input range of ±38 V, but those limits apply within their stated conditions. Protect external pins with suitable clamping when sensing long cables or switching nodes, and include filtering where response time is not critical.
اطلاعات انطباق
The Texas Instruments product information identifies the LM2903 family and open-collector architecture, but explicit RoHS, REACH, AEC-Q100, lead-free, halogen-free, and conflict-minerals statuses are not stated for the exact LM2903DE4 orderable part.