MMTL431B

Overview

The Diotec Semiconductor MMTL431B is an adjustable precision diode shunt regulator housed in a SOT-23 package. It features a reference voltage (VREF) of 2.495 V with a narrow tolerance band of ±0.5%. The device operates within a cathode voltage range of VREF to 36 V and supports a DC cathode current from 1 mA to 100 mA. Key electrical characteristics include a dynamic output impedance of approximately 0.15 Ω, a maximum total power dissipation of 300 mW, and a junction temperature rating up to 150°C. The minimum regulation current for the B version is specified at 0.03 mA.

Feature Summary

• Temperature compensated design ensuring stable performance across operating ranges
• Low output impedance for precise voltage regulation
• Version B optimized with low minimum regulation current
• Narrow reference voltage tolerance band

Applications

• Precision voltage reference for voltage regulators and comparators
• Replacement for low voltage Zener diodes
• Low component count power supplies for microcontrollers
• Secondary side control for converters

Procurement Notes

Verify the specific suffix requirements against the target application environment. Standard versions are rated for commercial and industrial grades. Automotive-grade variants require the -Q or -AQ suffixes for AEC-Q100 compliance or qualification. Confirm moisture sensitivity levels and soldering conditions prior to assembly to ensure reliability.

Selection Notes

Select the MMTL431B over the MMTL431A when a lower minimum regulation current is required for efficient operation at light loads. Ensure the circuit design maintains stability by adhering to recommended capacitance values. Verify that the thermal resistance limits are respected under maximum power dissipation conditions to prevent junction overheating.

Part Context

This component belongs to the MMTL431 family of adjustable precision shunt regulators manufactured by Diotec Semiconductor. The family includes variations such as the MMTL431A and reverse-pinning versions like the MMTL431AR. These devices serve as high-precision alternatives to standard Zener diodes in compact surface-mount designs.

Replacement Considerations

Public confirmed substitute part numbers: None available.