LM140LAH-12/NOPB

The Texas Instruments LM140LAH-12/NOPB is a fixed-output positive linear voltage regulator that delivers a regulated +12 V supply in a rugged, hermetically sealed TO‑39 metal can package. It belongs to the LM140L family of three‑terminal regulators, engineered for nominal 100 mA load currents with internal safe‑area protection, current limiting, and thermal overload shutdown. The hermetic TO‑39 package provides low thermal resistance and mechanical robustness, making it well‑suited for board‑level heat sinking and operation across a wide military temperature range (−55 °C to +125 °C). The /NOPB suffix denotes a lead‑free, RoHS‑compliant finish, while the underlying die retains the electrical and reliability characteristics expected in extended‑temperature, high‑reliability designs.

Typical applications include point‑of‑load regulation for analog sensor chains, precision reference rails for data converters, and post‑regulation in isolated DC‑DC converter modules within avionics, radar systems, missile guidance, and satellite payloads. The device is also used in ruggedized industrial instrumentation where a stable, low‑noise +12 V rail must be maintained under shock and vibration. From a procurement standpoint, the LM140L series occupies a category of mil‑spec, extended‑temperature linear regulators that are actively supported by Texas Instruments and designed into long‑lifecycle programs. The TO‑39 through‑hole form factor remains a preferred drop‑in solution for board layouts that require proven thermal performance and ease of substitution in legacy military and aerospace equipment, reducing lifetime buy and obsolescence concerns.