LM137H

Overview

The LM137H is a negative adjustable voltage regulator manufactured by National Semiconductor, now part of Texas Instruments. It provides an output current capability of 0.5 A with an adjustable output voltage range spanning from -1.2 V to -47 V. The device features internal protection mechanisms including current limiting and thermal limiting to prevent damage during overload or short-circuit conditions. It is housed in a TO-39 (TO-225AA) metal can package.

Feature Summary

• Adjustable negative output voltage ranging from -1.2 V to -47 V
• Integrated internal current and power limiting for overload protection
• True thermal limiting prevents device damage even without a heat sink

Applications

• Negative voltage regulation in industrial control systems
• Power supply modules requiring adjustable negative rails
• Electronic equipment needing protected negative voltage sources

Procurement Notes

Verify the component's lead finish, which is specified as Tin/Lead (Sn/Pb), ensuring compliance with project material requirements. Confirm that the TO-39 metal can package aligns with the intended PCB layout or chassis mounting constraints. Check for RoHS non-compliance status if environmental regulations apply to the final assembly.

Selection Notes

Select this component when a robust, adjustable negative voltage source is required with inherent protection against shorts. The TO-39 package offers high thermal dissipation capabilities compared to plastic packages. Ensure the application does not require lead-free soldering processes due to the Sn/Pb terminal finish.

Part Context

This regulator belongs to the LM137 series of negative adjustable voltage regulators. It shares functional similarities with the LM137HVH but differs in specific voltage ratings and package configurations within the broader family of linear regulators designed for stable negative voltage generation.