Texas Instruments LM111WLQMLV

Overview

LM111WLQMLV from Texas Instruments is a radiation-hardened voltage comparator designed for space and high-reliability military applications. It features 200 nA max input bias current, ±30 V differential input range, 50 mA output sink capability, and operates from single 5 V to dual ±15 V supplies. Its strobe function, offset null capability, and ground-isolated inputs/outputs enable use in precision threshold detection within satellite power management systems.

For engineers reviewing the LM111WLQMLV datasheet, LM111WLQMLV pinout, LM111WLQMLV application, or LM111WLQMLV equivalent, this device is selected for radiation-tolerant analog signal conditioning where low input current, wide supply range, and MIL-STD-883 Class QMLV qualification are mandatory - especially in spacecraft telemetry interfaces, radiation-hardened sensor monitoring, and fault-detection circuits requiring ELDRS-free performance up to 100 krad(Si).

Technical Context

The LM111WLQMLV implements an open-collector NPN output stage with internal strobe control, enabling synchronized comparison windows and wire-OR'ed outputs. Its input stage uses matched transistor pairs to achieve ≤±4 mV input offset voltage and ≤±20 nA input offset current over −55°C to +125°C.

It supports three operating modes: standard comparison (with external pull-up), strobed comparison (via BAL/STROBE pin), and offset-null-adjusted operation (using BALANCE and BAL/STROBE pins). The device meets MIL-PRF-38535 QMLV requirements including High Dose Rate (50 krad(Si)) and Low Dose/ELDRS-Free (100 krad(Si)) radiation tolerance.

Key Specifications

Pinout & Package

LM111WLQMLV is supplied in an 8-pin TO-99 metal can package (Package Number LMC0008C), with Pin 4 internally connected to case for shielding and thermal conduction. The package is hermetically sealed and qualified per MIL-STD-883.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar voltage comparator applications.

Compared with LM111QMLV and LM111H, the LM111WLQMLV uniquely combines TO-99 hermetic packaging, 100 krad(Si) ELDRS-free qualification, and case-connected shielding - making it the sole choice for long-life, high-reliability spaceborne comparator applications demanding mechanical robustness and EMI resilience.

Availability

LM111WLQMLV is available at Aetrix Electronics and suitable for spacecraft power management, satellite telemetry systems, radiation-hardened sensor interfaces, and MIL-STD-1553 bus monitoring requiring stable component supply under extended lead times and strict traceability.

Supply support for LM111WLQMLV includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor leader specializing in analog and embedded processing technologies, with decades of heritage in high-reliability aerospace components.

The LM111WLQMLV belongs to TI's QMLV-certified linear comparator product line, engineered specifically for mission-critical space electronics where radiation tolerance, thermal stability, and long-term parametric consistency are non-negotiable design requirements.

FAQ

What is the maximum total ionizing dose (TID) rating for the LM111WLQMLV?

The LM111WLQMLV is rated for 100 krad(Si) with ELDRS-free performance, verified per MIL-STD-883 Method 1019 Condition D. This ensures stable electrical parameters - including input offset voltage and bias current - after exposure to cumulative radiation in low-earth or geosynchronous orbits. The LM111WLQMLV maintains full functionality without recalibration throughout its operational lifetime under this dose limit.

Does the LM111WLQMLV support single-supply operation?

Yes, the LM111WLQMLV supports true single-supply operation from +5 V to +15 V with respect to ground. Its input common-mode range extends to within 1.5 V of the negative rail (GND), and the open-collector output can be pulled up to any voltage ≤50 V above GND. This allows direct interfacing with 5 V logic families and eliminates the need for dual supplies in many telemetry and monitoring applications.

How is the strobe function implemented on the LM111WLQMLV?

The LM111WLQMLV implements strobe control via Pin 6 (BALANCE/STROBE): applying a logic-low signal disables the output regardless of input conditions, while a logic-high enables normal comparison. This feature is essential for synchronizing comparisons to system clocks or avoiding false triggers during power-up transients. Strobe current is limited to 10 mA max, and the strobe pin tolerates voltages down to −5 V relative to V+.

What package type is used for the LM111WLQMLV, and why is it significant?

The LM111WLQMLV uses an 8-pin TO-99 metal can package (LMC0008C) with Pin 4 internally bonded to the case. This hermetically sealed construction provides superior EMI shielding, thermal conduction to chassis, and mechanical ruggedness - critical for launch vibration and vacuum environments. Unlike plastic or ceramic packages, the TO-99 minimizes outgassing and ensures long-term reliability in space applications.

Can the LM111WLQMLV drive a relay directly?

Yes, the LM111WLQMLV can directly drive small-to-medium electromagnetic relays with coil currents up to 50 mA and voltage ratings ≤50 V. Its open-collector NPN output saturates at ≤1.5 V when sinking 50 mA, ensuring sufficient voltage headroom across typical 5–24 V relay coils. An external pull-up resistor (e.g., 1 kΩ to +5 V or +12 V) completes the drive circuit, eliminating need for buffer transistors in most space-qualified relay control designs.