ZTL431ASE5TA

Overview

The ZTL431ASE5TA is a three-terminal adjustable shunt regulator manufactured by Diodes Incorporated. It provides an initial reference voltage tolerance of 1% at +25°C and operates within an ambient temperature range of -40°C to +125°C. The device supports a cathode voltage up to 20V and handles sink currents from 1mA to 100mA. Output voltage is programmable between the reference voltage and 20V using external resistors. It is housed in a SOT-25 surface-mount package.

Feature Summary

• Offers excellent temperature stability with a standard operating range of -40°C to +125°C
• Provides precise voltage regulation with 1% initial tolerance for the A grade
• Features low dynamic output impedance for improved performance over zener diodes
• Totally lead-free, fully RoHS compliant, and halogen/antimony free

Applications

• Opto-coupler linearization
• Linear regulators
• Improved Zener diode replacement
• Variable reference circuits

Procurement Notes

Verify the specific ordering code ZTL431ASE5TA against the manufacturer's current active status. Confirm that the SOT-25 package matches the design requirements. Ensure compliance with RoHS and REACH directives as specified in the datasheet notes. Check for any recent product change notices regarding assembly or wafer sources before finalizing procurement.

Selection Notes

Select this component when a cost-effective adjustable precision shunt regulator is required. It serves as a functional equivalent to TL431 devices but is limited to a maximum operation voltage of 20V. Choose the A grade variant specifically when a 1% initial tolerance meets the circuit accuracy requirements. Consider the SOT-25 package dimensions during PCB layout planning.

Part Context

This part belongs to the ZTL431/ZTL432 family of adjustable precision shunt regulators. While electrically similar to the TL431 series, it features a lower maximum cathode voltage rating of 20V. The 'E5' suffix indicates the SOT-25 package configuration. The 'A' designation specifies the 1% tolerance grade, distinguishing it from the higher precision B grade variants available in the same family.

Replacement Considerations

Functionally equivalent to TL431/TL432 except for the reduced maximum operation voltage. Verify pinout compatibility if replacing components in existing designs. For applications requiring voltages exceeding 20V, alternative parts from the broader Diodes Incorporated portfolio must be selected.

FAQ

What is the maximum cathode voltage for the ZTL431ASE5TA?

The maximum continuous cathode voltage (VKA) is rated at 20V.

How does the ZTL431 differ from the TL431?

The ZTL431 is functionally equivalent to the TL431 but has a different maximum operation voltage limit of 20V compared to the standard TL431 ratings.

What is the recommended capacitor value for stability?

To ensure reliable stability, a capacitor of 4.7nF or greater is recommended between the anode and cathode pins.