SPX431BM1-L/TR

Overview

The SPX431BM1-L/TR is a precision adjustable shunt regulator manufactured by Sipex. It operates within an input voltage range of 2.5V to 36V and provides an initial accuracy of 0.5%. The device supports a maximum shunt current of 150mA with a minimum operating current of 1mA. It features a temperature coefficient of 30ppm/°C and functions across a wide temperature range from -40°C to +125°C. Packaged in a SOT-89-3 surface-mount format, it serves as a high-performance voltage reference solution.

Feature Summary

• Precision adjustable shunt regulation with tight initial accuracy
• Wide operating voltage range supporting up to 36V input
• Extended industrial temperature rating for harsh environments
• Compact three-terminal SOT-89-3 surface-mount package

Applications

• Precision voltage reference sources
• Programmable output regulators
• Portable equipment power management
• Battery-powered system monitoring

Procurement Notes

Verify the manufacturer designation carefully, as historical records indicate production by Sipex Corporation, while some distributor listings may reference MaxLinear due to corporate acquisitions. Confirm the specific suffix 'L/TR' indicates tape-and-reel packaging. Check for End-of-Life status or obsolescence notices before finalizing procurement plans, as availability may be restricted.

Selection Notes

Select this component when a low-cost, high-accuracy shunt regulator is required for space-constrained designs. The SOT-89-3 package offers a compact footprint suitable for dense PCB layouts. Ensure the application demands a shunt topology rather than a series regulator. Verify that the 150mA current handling capability meets the load requirements without exceeding thermal limits in the chosen enclosure.

Part Context

This part belongs to the SPX431 family of precision adjustable shunt regulators. These devices are widely used as voltage references in analog circuits. The BM1 variant typically denotes specific accuracy grades compared to other suffixes. The technology leverages bandgap reference principles to maintain stability over temperature variations.

FAQ

What is the minimum operating current required for stable regulation?

The device requires a minimum cathode current of 1mA to maintain proper regulation.

Does this component include a shutdown feature?

No, the SPX431BM1-L/TR does not include a dedicated shutdown pin or function.