ZXRE250BW5-7

Overview

The ZXRE250BW5-7 is a three-terminal adjustable precision shunt regulator manufactured by Diodes Incorporated. It operates within a cathode voltage range of VREF to 36V and supports a sink current capability from 0.065mA to 100mA. The device features a typical minimum cathode current for regulation of 40µA, making it suitable for low-power applications. It offers an initial reference voltage tolerance of ±0.5% at +25°C, with a nominal reference voltage of 2.495V. The component is housed in a SOT-25 package and is designed for operation across a temperature range of -40°C to +125°C.

Feature Summary

• Adjustable output voltage settable between the reference voltage and 36V using external resistors
• Very low minimum cathode current requirement for regulation
• High temperature stability over extended operating ranges
• Low dynamic output impedance for stable performance

Applications

• Optocoupler linearisers
• Shunt regulators
• Improved Zener diode replacements
• Variable reference circuits

Procurement Notes

Verify the specific B grade designation confirms the ±0.5% initial tolerance specification required for the design. Confirm the W5 suffix corresponds to the SOT-25 package footprint and pinout compatibility with the target PCB layout. Ensure compliance with RoHS and halogen-free requirements matches project environmental standards. Check for any obsolescence notices or recommended new design alternatives provided by the manufacturer.

Selection Notes

Select this component when a low quiescent current shunt regulator is needed to replace standard Zener diodes for improved accuracy. The B grade provides tighter initial voltage tolerance compared to the A grade. Consider the SOT-25 package size constraints and thermal dissipation capabilities relative to the expected load current. Verify that the application does not require high-frequency switching characteristics beyond the device's analog regulation limits.

Part Context

This part belongs to the ZXRE25x series of adjustable shunt regulators from Diodes Incorporated. It shares electrical specifications with industry-standard '431 devices but distinguishes itself through a significantly lower minimum cathode current for regulation. The series includes variants with different tolerances and packages, such as the SA (SOT-23) and W5 (SOT-25) options.

Replacement Considerations

Diodes Incorporated recommends using AP431SHA(B)N1TR-G1 as a replacement for the ZXRE250BSA-7 variant. Users should verify pinout compatibility and electrical parameter equivalence before substituting other generic shunt regulators.