LM111J-8/883

Overview

The LM111J-8/883 is a high-reliability voltage comparator manufactured by Texas Instruments, designed for military and aerospace applications. It features a single channel with an open-collector output capable of driving loads up to 50 mA at voltages up to 50 V. The device operates on supply voltages ranging from a single 5 V source to dual ±15 V rails. Key electrical parameters include a typical response time of 200 ns, a maximum input bias current of 200 nA, and a maximum offset current of 20 nA. It supports differential input voltages up to ±30 V and includes features for offset nulling and strobing.

Feature Summary

• Radiation hardening ensures reliability in high-dose-rate environments up to 50 krad(Si) and eliminates the enhanced low-dose-rate sensitivity (ELDRS) effect.
• Open-collector output allows flexible interfacing with various logic families including RTL, DTL, TTL, and MOS circuits, as well as direct drive for lamps or relays.
• Input and output stages can be isolated from ground, enabling the output to drive loads referenced to positive or negative power supplies.
• Integrated offset balance and strobe functions provide precise control over comparator thresholds and switching timing.

Applications

• Military-grade signal processing systems requiring radiation tolerance
• Aerospace instrumentation and telemetry circuits
• High-voltage threshold detection in industrial control systems
• Logic interface circuits connecting analog sensors to digital processors

Procurement Notes

Verify that the component carries the correct /883 suffix, indicating compliance with MIL-PRF-38534 standards. Confirm the specific lot traceability and radiation testing certificates required for your mission profile. Ensure the package type matches the ceramic dual-in-line configuration specified for this variant. Cross-reference the manufacturer's latest datasheet to confirm pinout compatibility with existing designs.

Selection Notes

Select this part when radiation hardness and long-term reliability are critical requirements. It is suitable for designs needing wide supply voltage flexibility and high-output current capability. Consider the 200 ns response time against faster alternatives if speed is the primary constraint. Verify that the thermal dissipation capabilities meet the system's power budget under worst-case operating conditions.

Part Context

This component belongs to the LM111 family of voltage comparators, which are widely used for general-purpose comparison tasks. The /883 designation signifies that it meets stringent military quality and reliability standards. It shares functional similarities with other members of the series but offers enhanced performance characteristics for harsh environments. The device replaces older discrete comparator solutions with a compact integrated circuit approach.

Replacement Considerations

• LM111QML
• LM111H/NOPB

FAQ

What is the maximum differential input voltage allowed?

The device supports a differential input voltage range of ±30 V.

Can the output drive external loads directly?

Yes, the open-collector output can switch currents up to 50 mA at voltages up to 50 V.