AP432RL-7

Overview

The AP432RL-7 is a three-terminal adjustable precision shunt regulator manufactured by Diodes Incorporated. It provides an output voltage range from 1.24V to 20V, set via external resistors. The device features a typical initial accuracy of ±1% and a temperature coefficient of 30ppm/°C. It operates with a cathode current range of 300µA to 200mA and supports a maximum supply voltage of 20V. The component is housed in an SC-59 (SOT-23-3) surface-mount package and functions within an ambient temperature range of -20°C to +85°C.

Feature Summary

• Three-terminal adjustable precision shunt regulation architecture
• Output voltage programmable between 1.24V and 20V using external resistors
• Guaranteed thermal stability across the extended commercial temperature range
• Low dynamic impedance for stable performance under varying load conditions

Applications

• Voltage reference sources for analog-to-digital converters
• Replacement for Zener diodes in voltage clamping circuits
• Programmable power supply feedback networks
• Battery charging control circuit references

Procurement Notes

Verify the specific suffix RL-7 to confirm the SC-59 tape-and-reel packaging configuration. Confirm that the ±1% accuracy class meets the design requirements, as other variants may offer different tolerances. Ensure the 20V maximum operating voltage aligns with the system's rail specifications. Check for end-of-life status or alternative recommendations from the manufacturer before finalizing procurement plans.

Selection Notes

Select this component when a low-cost, high-accuracy voltage reference is required in a small SOT-23 footprint. It is suitable for designs needing an adjustable reference up to 20V without external trimming. Consider the 300µA minimum cathode current requirement to ensure proper regulation during light-load conditions. Verify that the thermal performance within the -20°C to +85°C range satisfies the application environment.

Part Context

The AP432 series belongs to Diodes Incorporated's family of adjustable precision shunt regulators. These devices are designed to replace fixed-voltage Zener diodes, offering superior accuracy and lower temperature coefficients. The AP432 variant specifically targets general-purpose applications requiring stable voltage references in compact surface-mount packages.

Replacement Considerations

The datasheet explicitly recommends the AZ431L as a replacement for new designs. Engineers should evaluate the AZ431L for pin compatibility and electrical parameter alignment before substituting the AP432RL-7.