LM431SBCM32X

Voltage Reference Overview

The LM431SBCM32X is a programmable shunt regulator manufactured by onsemi, belonging to the LM431SC series. It features a reference input voltage of 2.482 V to 2.508 V with an initial accuracy of 0.5%. The device operates within a cathode voltage range of VREF to 36 V and supports a sink current capability from 1.0 mA to 100 mA. It utilizes a SOT-23 package (CASE 318BM) with pin configuration: Pin 1 Reference, Pin 2 Cathode, Pin 3 Anode. The component is rated for operation between -25°C and +85°C.

Voltage Reference Feature Summary

• Programmable output voltage adjustable between approximately 2.5 V and 36 V using external resistors
• Temperature compensated for stable operation across the full rated operating temperature range
• Low dynamic output impedance providing sharp turn-on characteristics suitable as a Zener diode replacement

Voltage Reference Applications

• Shunt regulator circuits
• Output control for three-terminal fixed regulators
• High current shunt regulation
• Current limit or constant-current sink applications

Voltage Reference Procurement Notes

Verify that the ordering suffix M32 corresponds specifically to the SOT-23 package type and standard operating temperature range (-25°C to +85°C). Confirm the 'SC' designation indicates the 0.5% initial accuracy tier. Ensure compatibility with the required pinout where Pin 2 is Cathode and Pin 3 is Anode before finalizing procurement.

Voltage Reference Selection Notes

Select this part when a precise 0.5% tolerance reference is required in a compact surface-mount footprint. The LM431SBCM32X offers superior accuracy compared to SA (2%) and SB (1%) variants. Consider the thermal resistance of the SOT-23 package if power dissipation exceeds 310 mW at ambient temperatures above 25°C.

Voltage Reference Part Context

This component is part of the LM431SA/SB/SC family of three-terminal adjustable regulators. While functionally similar to other members of the series, the SC variant distinguishes itself through tighter voltage tolerance specifications. The M32 suffix identifies the specific mechanical packaging and shipping format associated with the SOT-23 outline.

Voltage Reference Replacement Considerations

LM431SBCM3X

Voltage Reference FAQ

What is the pin configuration for the LM431SBCM32X?

Pin 1 is Reference, Pin 2 is Cathode, and Pin 3 is Anode.

How does the LM431SBCM32X differ from the LM431SBM32X?

The LM431SBCM32X belongs to the SC series with 0.5% initial accuracy, whereas the SB series has 1% initial accuracy.