SPX432AM-L/TR

Overview

The SPX432AM-L/TR is a three-terminal adjustable shunt voltage regulator manufactured by MaxLinear. It provides a highly accurate 1.24V bandgap reference with an initial tolerance of ±0.5%. The device supports an output voltage range from 1.24V to 18V and can sink up to 80mA of cathode current. It features a temperature coefficient of 50ppm/°C and operates within a junction temperature range of 0°C to 105°C. The component is housed in a surface-mount SOT-23-3 package.

Feature Summary

• Provides a precise 1.24V internal bandgap reference source for stable regulation.
• Offers wide programmable output voltage capability using external resistors.
• Supports high sink current capacity suitable for demanding load conditions.

Applications

• Precision adjustable power supply circuits
• Portable equipment requiring stable reference voltages
• Battery-powered systems needing efficient voltage regulation

Procurement Notes

Verify the specific suffix AM against the required datasheet specifications, as variations exist within the SPX432 family. Confirm availability status, as some listings indicate obsolete status while others show active stock. Ensure the SOT-23-3 package matches the PCB footprint requirements. Check RoHS compliance documentation if environmental regulations apply to the final assembly.

Selection Notes

Select this component when a low-cost, high-current adjustable shunt regulator is required. The 80mA sink capability distinguishes it from lower-current alternatives like the TL431. Consider the 0.5% initial accuracy and 50ppm/°C temperature coefficient for thermal stability needs. Verify that the 18V maximum input/output limit fits the system voltage rails.

Part Context

The SPX432 series belongs to MaxLinear's portfolio of precision voltage references, originally developed under the Exar brand. This specific part represents the AM variant with tighter initial tolerance compared to standard versions. It serves as a cost-effective alternative to more expensive integrated regulators in applications where discrete resistor setting is preferred.

Replacement Considerations

Direct substitutes include the SPX432M-L/TR for standard tolerance variants or the SPX432JAM-L/TR for wider temperature ranges. Cross-reference with industry standards like the TL431 if pin compatibility and similar electrical characteristics are sufficient for the design.

FAQ

What is the minimum operating current for the SPX432AM-L/TR?

The datasheet specifies a minimum cathode current of 1mA for proper regulation operation.

Does the SPX432AM-L/TR have a shutdown pin?

No, the SPX432AM-L/TR is a three-terminal device without a dedicated shutdown control pin.