LM293DG - Dual Precision Comparator, 2-36V, SOIC-8 | onsemi
MPN: LM293DG ✓ فعالLM293DG نمای کلی
A comparator is a differential amplifier used as a simple decision element: it compares two input voltages and switches its output state when the non-inverting input rises above the inverting input. The comparator category sits above discrete transistor switches in the signal-conditioning hierarchy and below instrumentation amplifiers in the analog IC family, sitting in the amplifier IC / signal conditioning control group of parts such as op amps, references and sensor interface ICs.
The LM293 series is distinguished from general-purpose comparators by its low input offset voltage, wide supply range and ability to operate with the common-mode input range extending to ground, which makes it a strong fit for single 5 V or single 12 V systems where the signal of interest lives near the negative rail. The two channels are fully independent, each with its own pair of inputs and output.
The open-collector output stage is the key architectural feature: the output transistor sinks current but never sources it, so an external pull-up resistor to the supply or logic rail is required to establish a valid high level. That architecture permits level shifting to any voltage up to the maximum supply, wired-AND bus tying, and direct drive of relay or solenoid drivers without a buffer stage. Because the output stage is a bipolar NPN transistor, output sink current is limited compared with modern CMOS comparators.
Typical applications include overvoltage and undervoltage protection in linear and switching power supplies, battery and pack monitoring window comparators, motor stall and over-current detection, industrial sensor thresholding, and automotive-style sensor protection. The SOIC-8 package with 1.27 mm lead pitch supports both through-hole assembly and standard surface mount reflow, and the -25 C to +85 C ambient range covers industrial and consumer equipment.
When designing with the LM293DG, always fit a pull-up resistor on each output and check the sink current against the pull-up value and the load. If your design needs rail-to-rail input operation, push-pull outputs, or a supply below 2 V, a CMOS comparator is the better choice; if it needs low offset with wide supply and open-drain flexibility, the LM293DG remains a proven, low-cost choice.
This page consolidates manufacturer specifications, drop-in replacement candidates, pin-level detail and practical design guidance so that you can qualify the LM293DG for an existing board revision without redrawing the footprint.
جایگزین‌های drop-in برای LM293DG — 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 LM293DG (همان فرم‌فاکتور و فوت‌پرینت) — متفاوت در Package, Output Type, Operating Temperature Range, Response Time, Comparator Type.
LM393DG
✅ جایگزین مستقیمبرای قیمت تماس بگیرید
مشاهده دیتاشیت ←LM2903DG
✅ جایگزین مستقیم ⚠️ مشخصات تأییدنشدهبرای قیمت تماس بگیرید
مشاهده دیتاشیت ←LM2903VQDRQ1
✅ جایگزین مستقیمبرای قیمت تماس بگیرید
مشاهده دیتاشیت ←LM293D
✅ جایگزین مستقیمبرای قیمت تماس بگیرید
مشاهده دیتاشیت ←LM393D
✅ جایگزین مستقیم✗ ناموجود
$0.11 / واحد
مشاهده دیتاشیت ←LM2903D
✅ جایگزین مستقیمبرای قیمت تماس بگیرید
مشاهده دیتاشیت ←LM293DG حداکثر مقادیر مجاز و مشخصات الکتریکی
| Comparator Type | Precision, dual, independent |
| Number of Comparators | 2 |
| Supply Voltage Range | 2 V to 36 V |
| محدوده دمای کاری | -25 C to +85 C |
| Input Offset Voltage | as low as 2.0 mV |
| Response Time | 1.3 microseconds |
| جریان تغذیه | 400 microamps |
| نوع خروجی | Open-collector / open-drain |
| Output Compatibility | CMOS, MOS, TTL, DTL, ECL |
| Common-Mode Input Range | Includes ground (single supply operation) |
| بسته‌بندی | 8-SOIC (SOIC-8), 1.27 mm lead pitch |
| نوع نصب | Surface Mount |
| Channel Independence | Fully independent channels |
| Input Common-Mode Range | Ground to (V+) - 1.5 V (typical single-supply behaviour) |
پیکربندی پین LM293DG
| پین 1 | OUT1 — Comparator 1 output, open collector |
| پین 2 | IN1- — Comparator 1 inverting input |
| پین 3 | IN1+ — Comparator 1 non-inverting input |
| پین 4 | GND — Negative supply / ground reference |
| پین 5 | IN2+ — Comparator 2 non-inverting input |
| پین 6 | IN2- — Comparator 2 inverting input |
| پین 7 | OUT2 — Comparator 2 output, open collector |
| پین 8 | VCC — Positive supply input |
کاربردهای معمول
LM293DG مناسب است برای 6 کاربردs: Power Supply Overvoltage and Undervoltage Protection, Battery Pack Window Monitoring, Motor Stall and Over-Current Detection, Industrial Sensor Thresholding, Automotive and Heavy Equipment Sensor Protection, Open-Drain Level Shifting and Bus Interfacing.
Power Supply Overvoltage and Undervoltage Protection
The LM293DG fits rail supervision because it compares a divided feedback voltage against a reference with input offset voltage as low as 2.0 mV and a 1.3 microsecond response time. In a 12 V supply design, place one channel across a resistor divider on the output rail and drive a crowbar or series pass transistor, so a rail excursion is detected in microseconds rather than milliseconds. The 2 V to 36 V supply range covers 5 V, 12 V, 24 V and 32 V industrial rails, and the open-collector output with an external pull-up drives an NPN or PNP disconnect stage directly without a logic buffer. Because the output stage never sources current, the pull-up resistor sets the trip logic level, and the low 400 microamp supply current keeps supervisory overhead negligible on low-power rails. The wide common-mode range down to ground lets the sensing divider work close to the negative rail, which matters in single-supply designs.
پیشنهادی
Battery Pack Window Monitoring
For multi-cell battery management, the two independent LM293DG channels form an upper and lower window comparator around a cell voltage sense line. The low 2.0 mV class input offset translates into a small trip-voltage error once the divider ratio is applied, which matters when the window is only a few hundred millivolts wide. The 1.3 microsecond response time catches fast over-current transients, while the 400 microamp supply current per channel is small against the cell capacity, so the monitor can stay permanently powered. Operating from 2 V to 36 V means the same device monitors a single Li-ion cell or a stacked pack without level shifting. The open-collector outputs can be tied together with a common pull-up to produce a single fault flag, or routed separately to a charger disable and a load disconnect. Note that the -25 C to +85 C rating of the LM293DG must be checked against the cell temperature range, or the wider-temperature LM2903 grade selected.
پیشنهادی
Motor Stall and Over-Current Detection
The LM293DG is used as a current-sense comparator in motor and solenoid drivers, comparing a low-side shunt amplifier output against a threshold set with a resistor divider. Because the comparator is fully differential and its common-mode range extends to ground, it can sit directly beside a ground-referenced shunt amplifier such as an INA-series part without offsetting the signal. The 1.3 microsecond response time allows the trip to interrupt PWM drive before the armature or winding overheats, and the open-collector output can pull down a hardware shutdown pin on the gate driver, removing the latency of a software fault path. The 2 V to 36 V supply range supports 5 V logic, 24 V actuators and 32 V industrial buses. With only about 400 microamps of supply current and no reference in the input path, the monitor contributes negligible overhead. The open-collector architecture also allows several motor channels to share one fault pull-up line.
پیشنهادی
Industrial Sensor Thresholding
Plant sensors such as thermistors, pressure transducers and photointerrupters produce slow, noisy analog signals that must be converted to logic. The LM293DG handles this cleanly: its 2.0 mV class input offset voltage keeps the switching threshold tight, and the wide 2 V to 36 V supply range lets the comparator sit beside 24 V sensor loops while the open-collector output is pulled up to a 5 V or 3.3 V logic rail for direct interfacing to a microcontroller or PLC input module. Because the output is open collector, one pin can also act as a wired-AND fault bus across several sensors, reporting any over-threshold condition on a single line. The 1.3 microsecond response is ample for thermal and pressure thresholds and adds no meaningful delay to control loops. For installations with wide ambient swings, specify the wider-temperature LM2903 variant or the automotive-qualified LM2903VQDRQ1 when the enclosure sees vehicle-grade temperatures. The SOIC-8 footprint keeps the comparator on the same board as the sensor front end.
پیشنهادی
Automotive and Heavy Equipment Sensor Protection
On the vehicle-rated side of the family, the pin-compatible LM2903VQDRQ1 provides the AEC-Q100-qualified option for the same 8-SOIC footprint as the LM293DG, letting a design migrate upward in qualification without a board spin. The LM293DG architecture suits these applications directly: a 2 V to 36 V supply range spans both 12 V and 24 V vehicle systems, the common-mode input range reaching ground supports sensors referenced to the vehicle return, and the open-collector output can sink fault-indicator current or drive an ISO 11898 or RS-485 transceiver enable line. The low 400 microamp supply current keeps standby drain acceptable, which matters when the comparator monitors a battery-backed domain. Because the LM293DG is rated to -25 C to +85 C, use it where the environment is controlled, and step up to the qualified wider-temperature part for exposed engine bay or trailer mounting.
پیشنهادی
Open-Drain Level Shifting and Bus Interfacing
The open-collector output of the LM293DG makes it a natural level shifter between domains with different logic voltages. Place a pull-up resistor from the output to the lower-voltage rail and the output node never exceeds that rail voltage, because the transistor only sinks current; driving the input high from a higher-voltage domain then produces a valid low-voltage logic signal without any translator IC. The 2 V to 36 V supply range allows the comparator itself to be powered from the higher rail, and the common-mode range extending to ground supports low-side signalling. A second channel can shift in the opposite direction, giving a bidirectional bridge with two devices. Because the open-collector stage also supports wired-AND, several sources can share a bus with a single pull-up, a classic arrangement for fault and alarm lines in industrial equipment. The 1.3 microsecond response is adequate for interrupt and handshake signalling, and the 400 microamp supply current keeps continuously powered level shifters inexpensive to run.
پیشنهادی
خلاصه محصولات پیشنهادی
داده‌های مرجع مهندسی برای LM293DG — مقایسه، راهنمای طراحی و اطلاعات انطباق.
راهنمای انتخاب
مقایسه با جایگزین‌ها
| پارامتر | این محصول | LM393DG | LM2903DG | LM2903VQDRQ1 | LM293D | LM393D | LM2903D |
|---|---|---|---|---|---|---|---|
| Package | 8-SOIC | 8-SOIC - same | 8-SOIC - same | 8-SOIC - same | 8-SOIC - same | 8-SOIC - same | 8-SOIC - same |
| Brand | onsemi | onsemi | onsemi | onsemi | Texas Instruments | Texas Instruments | Texas Instruments |
| Number of Comparators | 2 independent | 2 independent | 2 independent | 2 independent | 2 independent | 2 independent | 2 independent |
| Supply Voltage Range | 2 V to 36 V | 2 V to 36 V | 2 V to 36 V | 2 V to 36 V | 2 V to 36 V | 2 V to 36 V | 2 V to 36 V |
| Output Type | Open-collector / open-drain | Open-collector / open-drain | Open-collector / open-drain | Open-collector / open-drain | Open-collector / open-drain | Open-collector / open-drain | Open-collector / open-drain |
| Automotive Qualification | No (consumer/industrial grade) | No | No | Yes, AEC-Q100 | No | No | No |
تفاوت‌های کلیدی
- Wide 2 V to 36 V supply range with common-mode input extending to ground (در مقابلTLV2402ID)
- Drop-in path to automotive qualification on the identical footprint (در مقابلLM2903VQDRQ1)
- Lower offset voltage than the classic LM393-class comparators (در مقابلLM393D)
- Second-source flexibility without footprint rework (در مقابلLM293D)
یادداشت‌های طراحی
The open-collector output stage only sinks current; it never sources it. Every output pin therefore requires an external pull-up resistor to the desired logic rail, typically 2.2 kOhm to 100 kOhm. Without a pull-up the output floats and the threshold decision is invisible to downstream logic. Because the output transistor is a bipolar NPN, its saturation voltage and sink current limit must be respected when the pull-up is tied to a higher rail than the comparator supply. The same open-collector structure also allows multiple comparators to share one pull-up line for wired-AND fault signalling, which is a feature rather than a defect in most industrial designs.
Estimated: the LM293DG draws approximately 400 microamps of supply current per channel as listed in the part specifications, so a dual device consumes roughly 800 microamps at the supply pin. Over a year at 5 V this corresponds to about 35 mAh of standing consumption, which is negligible for mains-powered equipment but significant for battery-powered sensing nodes. Decouple the supply pin with a 0.1 microfarad ceramic capacitor placed within a few millimetres of pin 8, and add a bulk capacitor near the comparator if the source is a switching regulator with appreciable ripple. Because the supply range extends to 36 V, confirm that transient overshoot on the rail stays below the absolute maximum rating.
The common-mode input range extends to ground with a single supply, so both inputs can sit close to the negative rail, but the input bias current produces a small offset on high-impedance dividers. Choose divider resistors low enough that bias current error stays well below the 2.0 mV class input offset, and keep the two input traces short and away from switching nodes to avoid coupling into the threshold decision. Route the two channels differentially paired where possible, keep the ground pin connection short and low impedance, and avoid sharing a long ground return with relay or motor currents, which would inject errors larger than the comparator's own offset specification.
اطلاعات انطباق
The LM293DG is a -25 C to +85 C commercial and industrial grade part and is not AEC-Q100 qualified; use the pin-compatible LM2903VQDRQ1 for automotive designs. RoHS, REACH and halogen-free status should be confirmed against the current onsemi material declaration for the specific ordering code.
