ZTL431AFTA

Overview

The ZTL431AFTA is a three-terminal adjustable precision shunt regulator manufactured by Diodes Incorporated. It provides an output voltage range from the reference voltage up to 20V, set via two external divider resistors. The device features a 1% initial tolerance grade and operates within an ambient temperature range of -40°C to +125°C. Key electrical specifications include a typical dynamic output impedance of 0.2Ω and a sink current capability ranging from 1mA to 100mA.

Feature Summary

• Adjustable output voltage programmable between the reference voltage and 20V using external resistors
• High temperature stability with a standard operating range spanning -40°C to +125°C
• Low dynamic output impedance for improved regulation performance
• Totally lead-free and fully RoHS compliant construction

Applications

• Opto-coupler linearization
• Linear regulators
• Improved zener diode replacement
• Variable reference generation

Procurement Notes

Verify the specific package type and tolerance grade against project requirements before ordering. Confirm that the maximum cathode voltage rating aligns with the circuit design limits. Ensure compliance with environmental directives such as RoHS if applicable to the final assembly. Check for any recent product change notices or end-of-life announcements prior to procurement.

Selection Notes

Select this component when a cost-effective, high-precision shunt regulator is required for feedback loops or reference applications. The A-grade 1% tolerance suits general-purpose designs needing better accuracy than standard zeners. Consider the SOT23 package constraints regarding thermal dissipation and available board space during layout planning.

Part Context

This part belongs to the ZTL431/ZTL432 family of adjustable shunt regulators. It serves as a functional equivalent to the TL431 series but is distinguished by its maximum operation voltage limit. The ZTL431 variant utilizes a standard pinout configuration in the SOT23 package, differentiating it from the ZTL432 which has an alternate pinout.

Replacement Considerations

Functionally equivalent to the TL431 series, though users must account for differences in maximum operation voltage ratings. Verify pin compatibility when substituting into existing designs.