SPX431LAS-L

Overview

The SPX431LAS-L is a three-terminal adjustable shunt voltage regulator manufactured by Sipex. It provides a precise bandgap reference with a nominal output of 2.5V. The device features an open-loop error amplifier and exhibits high thermal stability. It supports a wide operating current range up to 100mA. The component is housed in a SOT-89-3 surface-mount package. It operates within a temperature range of -40°C to +125°C. The initial accuracy is specified at 0.5%, with a temperature coefficient of 30 PPM/°C. The maximum supply voltage is 20V, and the output can be adjusted from 2.493V to 36V using external resistors.

Feature Summary

• Provides a temperature-compensated bandgap reference for stable voltage regulation
• Features an open-loop error amplifier for precise control
• Supports wide operating current ranges up to 100mA
• Offers high thermal stability across extended temperature ranges

Applications

• Precision voltage references in power management circuits
• Adjustable linear shunt regulators
• Temperature compensation applications requiring stable reference voltages

Procurement Notes

Verify the manufacturer designation as Sipex or MaxLinear depending on the specific production lot, as corporate acquisitions may affect labeling. Confirm the SOT-89-3 package type matches the design requirements. Ensure the operating temperature range of -40°C to +125°C aligns with the environmental conditions. Check for RoHS compliance status if required by the assembly process. Validate the 0.5% initial accuracy specification against circuit tolerance needs.

Selection Notes

Select this component when a low-cost, adjustable shunt regulator with high precision is required. The SOT-89-3 package is suitable for space-constrained surface-mount designs. Consider the 100mA current capability for load driving requirements. The wide input voltage range allows flexibility in supply rail variations. Ensure the 30 PPM/°C temperature coefficient meets the system's drift specifications.

Part Context

The SPX431LAS-L belongs to the SPX431 series of voltage references. This family includes various packages and accuracy grades. The device functions similarly to standard Zener diodes but offers superior stability and adjustability. It is commonly used in industrial and consumer electronics where reliable voltage regulation is critical.

Replacement Considerations

Check for direct pin-compatible substitutes within the same series. Verify that alternative parts maintain the 2.5V reference voltage and similar current capabilities. Ensure package compatibility with existing footprints.