LM136H-5.0/NOPB

Overview

The LM136H-5.0/NOPB is a precision shunt voltage reference from Texas Instruments, functioning as a monolithic integrated circuit equivalent to a low-temperature-coefficient 5.0V Zener diode with 0.6 ohm dynamic impedance. It features a third terminal for easy adjustment of the reference voltage and temperature coefficient. The device operates within a wide current range of 600 uA to 10 mA and offers an initial accuracy of 1%. It is housed in a TO-3 through-hole package and supports an operating temperature range from -55°C to +125°C.

Feature Summary

• Provides a stable 5.0V reference with low temperature coefficient
• Features a third terminal for precise trimming of voltage and drift
• Operates as a parallel regulator for positive or negative references
• Ensures high stability across a wide industrial temperature range

Applications

• Precision digital voltmeters
• Power supply regulation circuits
• Operational amplifier biasing networks

Procurement Notes

Verify the specific suffix 'H' corresponds to the TO-3 metal can package and military-grade temperature range (-55°C to +125°C) rather than commercial variants. Confirm that the 'NOPB' designation indicates lead-free composition and RoHS compliance. Ensure the ordering part number matches the exact voltage rating of 5.0V to avoid confusion with other series members like the LM136-2.5.

Selection Notes

Select this component when a ruggedized, hermetically sealed voltage reference is required for harsh environments. The TO-3 package provides superior thermal dissipation compared to plastic packages. Choose this over adjustable references if a fixed 5.0V output is needed without external resistors. Consider the 1% initial tolerance for applications requiring minimal calibration effort.

Part Context

This part belongs to the LM136 family of precision shunt voltage references. Unlike the LM336 series which often uses smaller plastic packages, the LM136H variant utilizes a robust TO-3 metal case suitable for high-reliability applications. The family is designed to replace discrete Zener diodes, offering significantly better temperature stability and lower dynamic impedance.

Replacement Considerations

Public confirmed substitute part numbers: LM136H-5.0

FAQ

How does the third terminal function?

The third terminal allows for external connection to trim the reference voltage and minimize the temperature coefficient, enabling customization beyond the standard 5.0V specification.

What is the dynamic impedance of this device?

The LM136H-5.0/NOPB exhibits a very low dynamic impedance of approximately 0.6 ohms, ensuring stable performance under varying load currents.