TL431BVDR2

Overview

The TL431BVDR2 is a three-terminal programmable shunt regulator diode from onsemi, operating within the TL431B series. It functions as a low temperature coefficient zener reference programmable from Vref to 36 V using two external resistors. The device supports a cathode current range of 1.0 mA to 100 mA with a typical dynamic impedance of 0.22 Ω. It features a voltage reference tolerance of ±0.4% at 25°C and an equivalent full-range temperature coefficient of 50 ppm/°C. Packaged in SOIC-8 (D suffix), it operates over an ambient temperature range of -40°C to +125°C.

Feature Summary

• Programmable output voltage capability up to 36 V via external resistor divider
• High precision voltage reference with ±0.4% initial accuracy tolerance
• Temperature compensated operation across the full rated industrial and extended temperature range
• Low dynamic output impedance for stable regulation performance

Applications

• Digital voltmeters requiring stable reference voltages
• Power supply feedback control loops driving optocouplers
• Op amp circuitry serving as positive or negative voltage references
• Constant current sources and sinks
• Voltage monitoring circuits with defined trip points

Procurement Notes

Verify the specific ordering suffix matches the required package type and shipping quantity. Confirm that the component meets RoHS compliance standards if restricted materials are prohibited in the target assembly. Ensure the selected variant aligns with the necessary automotive or industrial qualification requirements specified by the NCV prefix if applicable to the design constraints.

Selection Notes

Select this component when a precise, adjustable shunt reference is needed to replace standard Zener diodes. The TL431B series offers tighter tolerance compared to lower grades, making it suitable for applications demanding high accuracy. Consider the thermal resistance characteristics and power dissipation limits relative to the expected cathode current and ambient operating conditions during circuit design.

Part Context

This device belongs to the TL431 family of programmable precision references manufactured by onsemi. The family utilizes monolithic IC technology to provide stable voltage referencing capabilities. The TL431B designation indicates a specific accuracy grade within the series, distinguished by its tighter tolerance specifications compared to other variants like the TL431C or TL431I.

Replacement Considerations

Compatible substitutes include TL431BCDR2G and TL431BIDR2G from onsemi, which share similar electrical characteristics and pinouts. Cross-manufacturer equivalents such as the KA431 or REF43 series may function similarly but require verification of pin compatibility and specific parameter alignment.