AP431IBNTR-G1

Voltage Reference Overview

The AP431IBNTR-G1 is a three-terminal adjustable precision shunt regulator manufactured by Diodes Incorporated. It operates within a cathode voltage range of 2.5V to 36V and provides an initial voltage tolerance of 1%. The device supports a sink current capacity from 100µA to 100mA with a typical minimum cathode current for regulation of 50µA. It features a low dynamic impedance of 0.1Ω and maintains stability under capacitive loads. The component functions across a wide operating temperature range from -40°C to +125°C and is housed in an SOT-23 package.

Voltage Reference Feature Summary

• Features sharp turn-on characteristics and low output impedance suitable for replacing Zener diodes
• Provides programmable precise output voltage between the reference voltage and maximum cathode voltage
• Ensures high stability when driving capacitive loads
• Maintains low deviation of reference voltage over the full temperature range

Voltage Reference Applications

• Switching power supplies
• Chargers
• Voltage adapters
• Graphic cards
• Precision voltage references

Voltage Reference Procurement Notes

Verify the specific ordering suffix 'BN' confirms the SOT-23 surface-mount package and 1% initial voltage tolerance before procurement. Confirm that the 'G1' suffix indicates compliance with RoHS directives and Halogen-free status. Ensure design compatibility with the manufacturer's recommendation to utilize the AP431S series for new designs, as this model is marked not recommended for new design.

Voltage Reference Selection Notes

Select this component when a low-cost, adjustable shunt regulator is required for applications needing precise voltage referencing. The 1% tolerance variant is appropriate where standard accuracy suffices. Consider the low minimum cathode current requirement if designing for very low power dissipation scenarios. Verify thermal resistance requirements against the SOT-23 package specifications for the intended ambient temperature conditions.

Voltage Reference Part Context

This part belongs to the AP431i family of adjustable precision shunt regulators produced by Diodes Incorporated. It serves as a functional substitute for industry-standard 431 devices but distinguishes itself through a lower minimum cathode current specification. The product line includes various packages such as TO-92, SOT-89, and SOT-23, offering flexibility for different board space and mounting constraints.

Voltage Reference Replacement Considerations

The datasheet explicitly recommends using the AP431S series instead of the AP431i for new designs. Engineers should evaluate the AP431S as the primary replacement or alternative for future projects to ensure long-term availability and updated manufacturing processes.

Voltage Reference FAQ

What is the typical minimum cathode current required for regulation?

The typical minimum cathode current for regulation is 50µA, with a maximum specified value of 100µA.

How does the AP431i differ from the standard 431?

The AP431i shares electrical specifications with the industry standard 431 but features a significantly lower minimum cathode current for regulation, making it ideal for low power dissipation applications.

Is the device stable under capacitive loads?

Yes, the AP431i is designed to provide high stability under capacitive load conditions.