LM139AJ/883QS – NATIONAL SEMICONDUCTOR

The National Semiconductor LM139AJ/883QS is a precision, radiation-hardened, quad differential comparator specifically manufactured to meet stringent military specifications. This device offers exceptional input offset voltage matching (typically <1mV) and high gain, making it ideal for demanding applications requiring precise voltage level detection. The open-collector outputs provide a Voltage Rating of 36V and a Current Rating of 25mA, allowing for flexible interfacing with various logic families or driving relay coils directly. Housed in a hermetically sealed 14-pin Ceramic Dual In-Line Package (CerDIP), this component guarantees reliability across an Operating Temperature Range of –55°C to +125°C. Common use cases include zero-crossing detectors, high-side current sensing, and window comparators in harsh environments. Its low input bias current and fast response time result in superior performance compared to standard comparators, especially in noise-sensitive circuits and high-frequency applications.