LM336Z

Overview

The LM336Z is a precision 2.5V shunt voltage reference diode manufactured by STMicroelectronics in a TO-92 plastic package. It operates within a commercial temperature range of 0°C to +70°C. The device provides a nominal breakdown voltage of 2.49V at 1mA reverse current, with a guaranteed range of 2.39V to 2.59V for the B-grade variant. Key electrical characteristics include a low dynamic impedance of 0.2Ω and a wide operating current range from 400µA to 10mA.

Feature Summary

• Monolithic IC design offering stable regulation comparable to Zener diodes but with superior performance metrics
• Third pin allows independent adjustment of reference voltage and temperature coefficient
• Low dynamic impedance ensures minimal voltage variation under changing load conditions
• Fast turn-on response suitable for applications requiring rapid stabilization

Applications

• Precision power regulators requiring low temperature coefficients
• Wide input range reference circuits
• Linear ohmmeters utilizing stable voltage references
• Bipolar output reference generation

Procurement Notes

Verify the specific suffix (e.g., Z, BZ) to confirm the operating temperature range and initial accuracy grade. Confirm the required packaging format, such as bulk or tape and reel, matches the ordering code. Ensure the application environment stays within the specified 0°C to +70°C limit for this package variant.

Selection Notes

Select the LM336Z when a stable 2.5V reference is needed with adjustable parameters. The third pin enables optimization of temperature stability by connecting two devices in series. Choose this component over standard Zeners for lower dynamic impedance and better long-term stability in precision analog circuits.

Part Context

Part of the LM236/LM336 family of 2.5V voltage references. The LM336 denotes the commercial temperature grade (0°C to +70°C), while the LM236 covers the extended industrial range (-25°C to +85°C). Both share identical electrical characteristics and pinouts, differing only in temperature specifications.

Replacement Considerations

LM236Z: Identical electrical performance but rated for -25°C to +85°C operation.

FAQ

How can the temperature coefficient be minimized?

Connect two LM336 devices in series and adjust the total voltage to 2.49V using a potentiometer on the adjustment pins.

What is the purpose of the third pin?

The third pin allows for the adjustment of the reference voltage and the temperature coefficient without altering the basic regulation function.