Texas Instruments LM293 Dual Comparator – Precision, Low-Power Analog Comparator for Industrial and Automotive Systems
De LM293 is a dual differential comparator from Texas Instrumenten designed to provide low-offset, fast response in analog signal processing environments. Featuring a wide supply range of 2 V to 36 V and an input offset voltage as low as 2 mV, the LM293 is ideal for voltage level detection, sensor threshold control, and monitoring functions.
This device supports both single and split supply operation and is well-suited for battery-operated systems, industrial controls, and automotive electronics. The LM293’s open-collector outputs allow it to interface directly with TTL and CMOS logic levels, making it highly adaptable for mixed-signal system designs.
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Technical Specifications
| Parameter | Waarde | Eenheid |
|---|---|---|
| Comparator Channels | 2 | – |
| Input Offset Voltage (Typ) | 2 | mV |
| Bereik voedingsspanning | 2 to 36 / ±1 to ±18 | V |
| Ingangsbiasstroom | 25 | nA |
| Reactietijd | 1.3 | µs |
| Type uitvoer | Open-Collector | – |
| Bedrijfstemperatuurbereik | -40 to +85 | °C |
| Pakketopties | SOIC-8, DIP-8 | – |
Key Features and Performance Advantages
- Dual Comparator Design: Provides two independent analog comparators in a single chip, reducing BOM cost and PCB space.
- Flexible Supply Options: Compatible with both single-supply and split-supply architectures, from 2V up to 36V total.
- Fast Switching: A response time of 1.3 µs makes it suitable for real-time monitoring and control systems.
- Low Offset & Bias: Maintains accurate comparisons even in low-signal-level applications and high-impedance networks.
- Wide Industry Use: Standard part in industrial automation, motor controls, and automotive ECU systems.
Typische toepassingen
- Zero-crossing detectors
- Overvoltage/undervoltage monitoring
- Temperature sensor threshold circuits
- Current sense and limit circuits
- Low-power analog watchdogs
Texas Instruments Reliability and Industrial Compliance
The LM293 is manufactured by Texas Instrumenten, a globally trusted semiconductor manufacturer. This component is tested for operation across the full -40°C to +85°C industrial temperature range, ensuring high reliability in mission-critical applications. With availability in standard SOIC and DIP packages, integration into legacy and modern designs is effortless.
Veelgestelde vragen (FAQ)
Can the LM293 be used in both analog and digital systems?
Yes, the open-collector output of the LM293 can be pulled up to different logic levels, allowing it to interface between analog sensor signals and digital logic circuits like microcontrollers.
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What are the advantages of using LM293 over op-amps in comparator mode?
While op-amps can be used as comparators, the LM293 offers faster switching speed, lower power consumption, and open-collector outputs optimized for comparator tasks, ensuring better performance.
How do I configure the LM293 output for digital logic use?
Connect a pull-up resistor between the output pin and your logic voltage (e.g., 5V), and the LM293 will pull low when triggered. This allows easy interfacing with microcontroller GPIOs.
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Is the LM293 suitable for automotive applications?
Yes, it’s commonly used in engine control units and sensor feedback systems. It operates reliably across wide voltage ranges and harsh environmental conditions.
What power supply configurations are supported?
The LM293 supports both single-supply (2–36 V) and dual-supply (±1 V to ±18 V) setups, making it highly flexible for many circuit designs.
