LM139W

Overview

The LM139W is a quad differential comparator manufactured by Texas Instruments, designed for low-power applications. It features four independent comparators in a single package, operating from a wide single-supply voltage range of 2 V to 36 V or dual supplies of ±1 V to ±18 V. The device offers very low supply current of 0.45 mA and low input bias current of 20 nA typical. It includes internal ESD protection rated at 2 kV HBM on all pins. The output saturation voltage is typically 80 mV at an output sink current of 4 mA. The component operates within a temperature range of -55°C to +125°C.

Feature Summary

• Quad differential comparator configuration with low power consumption
• Wide single-supply or dual supply voltage operation capability
• Internal electrostatic discharge (ESD) protection robustness
• TTL, DTL, ECL, MOS, and CMOS compatible outputs

Applications

• Battery-powered systems requiring low quiescent current
• Temperature sensing circuits utilizing thermistors
• Level detection and threshold monitoring applications
• Pulse width modulation (PWM) generation circuits

Procurement Notes

Verify the specific package type and suffix codes against the manufacturer's official datasheet to ensure compatibility with your design requirements. Confirm RoHS compliance status and environmental certifications as per the latest product documentation. Ensure that the ordering information matches the exact part number variant required for your application.

Selection Notes

Select this component when low power consumption and wide supply voltage range are critical. Consider the quad configuration for space-constrained designs requiring multiple comparison functions. Evaluate the ESD protection levels if the application involves high static sensitivity environments. Compare performance metrics such as offset voltage and response time against alternative comparators for optimal system efficiency.

Part Context

The LM139W belongs to the LM139/LM293/LM393 family of low-power quad comparators. These devices are widely used in industrial and consumer electronics for signal conditioning and control applications. The W suffix typically denotes a specific package style, often associated with surface-mount technology. This family is known for its versatility in single-supply operations and compatibility with various logic families.

Replacement Considerations

LM393W: Pin-compatible alternative with similar electrical characteristics. LM293W: Dual comparator version, not a direct quad replacement. LM139DR: Different package option, verify pinout compatibility. LM339N: Through-hole equivalent, check package differences.