LM2903 Dual Comparator – Low-Power, Industrial Grade | Texas Instruments

Texas Instruments LM2903 – Dual Low-Power Comparator for Industrial and Automotive Applications

Le LM2903 is a dual, independent precision voltage comparator developed by Fabricant de circuits intégrés, optimized for both industrial and automotive-grade circuits. Designed by Texas Instruments, the LM2903 offers fast switching performance, low power operation, and compatibility with wide supply voltage ranges.

This device is commonly deployed in threshold detection, zero-crossing detectors, voltage level monitoring, and signal conditioning applications. Its open-collector output allows for flexible interfacing with digital systems and supports wired-AND logic.

Key Electrical Specifications

Paramètres	Valeur	Unité
Number of Comparators	2	–
Plage de tension d'alimentation	2 to 36	V
Tension de décalage d'entrée (max.)	5	mV
Supply Current (Typical)	0.8	mA
Type de sortie	Open-Collector	–
Temps de réponse	1.3	µs
Température de fonctionnement	De -40 à +125	°C
Options du paquet	SOIC-8, DIP-8	–

Benefits Over Conventional Comparators

Compared to typical general-purpose comparators, the LM2903 delivers greater power efficiency and reliable performance across extreme temperatures. Its low offset voltage ensures precise signal comparison, reducing false triggers in analog control systems. The open-collector design provides the flexibility to drive various loads and enables wired logic configurations in digital systems.

Core Features and Design Advantages

• Low Offset Voltage: Ensures accurate voltage threshold detection across input channels.
• Flexible Supply Compatibility: Works seamlessly with both single and split power supplies in mixed-signal systems.
• Wide Temperature Support: Designed for rugged industrial and automotive operating conditions.
• Energy-Efficient Operation: Minimizes current consumption without compromising speed.

Applications typiques

• Window comparators and zero-crossing detectors
• Battery undervoltage monitoring systems
• Automotive safety circuits and engine control systems
• Industrial instrumentation and process control loops
• Microcontroller interface threshold detection

Foire aux questions (FAQ)

What makes the LM2903 suitable for automotive environments?

Its wide operating temperature range (–40°C to +125°C), AEC-Q100 qualification, and robust electrical tolerances ensure high reliability in harsh automotive systems.

Can LM2903 operate with a single supply?

Yes. The comparator supports single-supply operation starting from 2V, which simplifies power architecture in many embedded systems.

Is the output compatible with digital logic?

Yes, its open-collector output can interface with TTL and CMOS logic by connecting a suitable pull-up resistor, enabling integration with microcontrollers and logic gates.

How does LM2903 handle voltage comparison accuracy?

With a maximum input offset voltage of 5 mV, the device maintains high comparison precision, reducing the risk of signal fluctuation or jitter near threshold levels.

Are there layout considerations when designing with LM2903?

Keep analog traces short and shielded from high-frequency signals, and ensure proper decoupling of the power supply to reduce susceptibility to noise in sensitive analog applications.