LM109H/NOPB

Overview

The LM109H/NOPB is a fixed linear voltage regulator from the LM109 series, manufactured by Texas Instruments. It provides a stable 5 V output with a maximum continuous current of 1 A. The device utilizes a TO-39-3 through-hole package and operates within an extended temperature range of -55°C to +150°C. Key electrical specifications include a line regulation of 4 mV, load regulation of 15 mV, and a typical power supply rejection ratio (PSRR) of 50 dB. The quiescent current is specified at 10 mA. This component is designed for local regulation on digital logic cards, offering internal thermal overload protection and current limiting without requiring external bypass components.

Feature Summary

• Provides fixed 5 V regulation suitable for TTL and DTL logic compatibility
• Includes internal thermal shutdown and peak current limiting protection
• Operates reliably in high-temperature environments up to 150°C

Applications

• Local regulation on digital logic cards
• Power supplies for TTL and DTL circuits
• Precision regulator control elements

Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to ensure the correct package type and temperature rating are selected. Confirm that the TO-39-3 through-hole package aligns with the target PCB layout requirements. Check for any recent product change notices or availability updates directly from Texas Instruments before finalizing procurement plans.

Selection Notes

Select this component when a robust, high-temperature fixed 5 V regulator is required for military or industrial applications. The LM109H/NOPB is appropriate for designs needing over 1 A output current capability in a hermetically sealed or ruggedized TO-39 package. Consider its higher quiescent current compared to modern low-dropout regulators if power efficiency is a primary constraint.

Part Context

The LM109 series consists of complete 5 V regulators fabricated on a single silicon chip. These devices are designed to eliminate distribution problems associated with single-point regulation by enabling local regulation. The series is available in standard transistor packages, including the TO-39 format used in the LM109H/NOPB, which supports high output currents when adequate heat sinking is provided.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided source material.