TL431BVDR2G

Overview

The TL431BVDR2G is a three-terminal programmable shunt regulator diode from onsemi, operating as a low temperature coefficient Zener reference. It provides an adjustable output voltage ranging from the internal Vref to 36 V using two external resistors. The device features a typical voltage reference tolerance of ±0.4% at 25°C and supports a sink current capability between 1.0 mA and 100 mA. It exhibits a typical dynamic output impedance of 0.22 Ω and an equivalent full-range temperature coefficient of 50 ppm/°C. Packaged in SOIC-8 (D Suffix), it operates within an ambient temperature range of -40°C to +125°C.

Feature Summary

• Programmable precision reference with output voltage adjustable up to 36 V via external resistors
• High accuracy with ±0.4% initial tolerance and low dynamic output impedance for stable regulation
• Temperature compensated operation across the full rated industrial and extended temperature range
• Pb-free, halogen-free construction compliant with RoHS standards

Applications

• Digital voltmeters requiring stable reference voltages
• Power supply feedback control circuits driving optocouplers
• Op amp circuitry serving as positive or negative voltage references
• Constant current sources and sinks
• Series pass regulators and voltage monitors

Procurement Notes

Verify that the ordering suffix 'R2G' corresponds to the SOIC-8 package and tape & reel shipping configuration. Confirm the 'B' grade designation ensures the required ±0.4% voltage reference tolerance for precision applications. Ensure the design accommodates the -40°C to +125°C operating temperature range specified for this variant. Check for AEC-Q100 qualification requirements if the application involves automotive environments, noting that NCV prefixes may be designated for such specific site controls.

Selection Notes

Select the TL431BVDR2G when high precision is required over a wide temperature range, specifically where the ±0.4% tolerance is critical. Choose this component over lower-grade variants like TL431CDR2G if strict accuracy limits are necessary. Consider the SOIC-8 package for surface-mount assembly constraints. Evaluate the 1.0 mA to 100 mA cathode current range to ensure compatibility with the load requirements of the shunt regulator topology.

Part Context

This component belongs to the TL431A, B series of programmable precision references manufactured by onsemi. It serves as a monolithic IC replacement for traditional Zener diodes, offering superior stability and adjustability. The device integrates an internal 2.5 V reference to facilitate logic supply interfacing. It is part of a broader family including NCV and SCV prefixed versions designed for automotive and specialized industrial applications requiring unique quality controls.

Replacement Considerations

TL431BCDR2G