SC431BVSNT1G

Overview

The SC431BVSNT1G is a three-terminal programmable shunt regulator diode from the NCP431/SC431 series, manufactured by onsemi. It operates as a low temperature coefficient zener reference, adjustable from Vref to 36 V using two external resistors. The device features a typical voltage reference tolerance of ±0.5% at 25°C and a typical dynamic impedance of 0.22 Ω. It supports a cathode current range of 40 µA to 100 mA with a minimum operating current of 40 µA. The component is qualified under AEC-Q100 standards for automotive applications and offers an equivalent full-range temperature coefficient of 50 ppm/°C.

Feature Summary

• Programmable output voltage capability up to 36 V via external resistor divider
• High precision voltage reference with ±0.5% initial accuracy tolerance
• Low minimum operating current enabling extremely low no-load consumption
• Automotive qualification (AEC-Q100) with PPAP capability for unique site requirements

Applications

• Secondary side regulation in switching power supply adapters
• Precision voltage reference circuits
• Voltage monitoring systems
• Constant current sources and sinks

Procurement Notes

Verify that the specific ordering suffix matches the required package type and tape/reel specifications. Confirm that the SC prefix designation aligns with project requirements for automotive-grade components subject to unique site and control change protocols. Ensure compliance with RoHS directives and check for any relevant PCN updates regarding assembly sites or material composition changes before finalizing procurement.

Selection Notes

Select this component when high precision and low quiescent current are critical for secondary regulation in SMPS designs. The ±0.5% tolerance makes it suitable for applications requiring tighter voltage accuracy than standard Zener diodes. Consider the SOT-23-3 package constraints for thermal management and board space. Verify stability boundary conditions with load capacitance if used in feedback loops.

Part Context

This part belongs to the NCP431/SC431 series of programmable precision references. It serves as a direct replacement for traditional Zener diodes in digital voltmeters and op-amp circuitry. The SC prefix indicates automotive qualification, distinguishing it from commercial variants like the NCP431AVSNT1G which lacks the specific automotive site controls.

Replacement Considerations

NCP431BVSNT1G is a commercial equivalent within the same series. SC431AVSNT1G offers similar electrical performance but without the automotive-specific site controls.