LM139E/883

Overview

The LM139E/883 is a military-grade quad differential comparator manufactured by Texas Instruments. It features four independent high-gain comparators designed for precise voltage detection in demanding environments. The device operates with a wide single-supply voltage range of 2 V to 36 V or dual supplies up to ±18 V. Key electrical specifications include a maximum input offset voltage of 5 mV, an input bias current of 25 nA, and a typical response time of 300 ns. It supports rail-to-rail output capabilities and draws a low operating supply current of 500 µA. The component is rated for an extended industrial temperature range from -55 °C to +125 °C.

Feature Summary

• Military-grade qualification ensuring reliability in harsh operational conditions
• Quad differential architecture providing four independent comparison channels
• Wide single or dual power supply compatibility for flexible system integration
• Low input bias current and offset voltage for accurate signal detection

Applications

• Precision voltage monitoring in aerospace systems
• Temperature sensing interfaces requiring high stability
• Industrial control logic circuits
• Over-voltage protection mechanisms

Procurement Notes

Verify the specific suffix E/883 indicates military compliance and ceramic packaging when sourcing. Confirm RoHS status as military parts often differ from commercial standards. Ensure the supplier provides traceability documentation required for defense or critical infrastructure projects. Check for lead times associated with specialized military inventory levels.

Selection Notes

Select this component when military environmental ratings are mandatory for the application. Consider the LM139E/883 over commercial variants if operation within -55 °C to +125 °C is required. Evaluate the trade-off between the higher cost of military-grade parts and the necessity for long-term reliability in uncontrolled environments.

Part Context

The LM139 series represents a legacy line of quad comparators widely used in analog circuit design. The E/883 designation specifically denotes a military version housed in a ceramic dual flatpack (DFP) package. This variant maintains the functional compatibility of the standard LM139 while adhering to stricter manufacturing and testing standards defined by military specifications.

Replacement Considerations

Direct pin-compatible replacements include the LM139DR for commercial applications or the LM139W/883 for other military ceramic packages. Verify that substitute parts meet the same thermal and electrical specifications for your specific use case.