TL431BVLPRAG

Overview

The TL431BVLPRAG is a three-terminal programmable shunt regulator diode from the TL431B series manufactured by onsemi. It operates as a low temperature coefficient zener, providing a reference voltage of 2.5 V that is programmable 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. The component is housed in a TO-92 package (LP suffix) and is rated for an operating 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% tolerance at 25 °C
• Wide operating temperature range extending to +125 °C
• Low dynamic output impedance and low output noise voltage

Applications

• Feedback control for driving optocouplers in power supplies
• Digital voltmeters requiring stable reference voltages
• Op amp circuitry serving as positive or negative voltage references
• Constant current sources and sinks
• Voltage monitor circuits

Procurement Notes

Verify the specific ordering suffix 'VLPRAG' against the manufacturer's official documentation to confirm availability and shipping format. The 'V' indicates the extended temperature grade (-40 °C to +125 °C), while 'LPRA' denotes the TO-92 package with tape and reel packaging. Confirm RoHS compliance and Pb-free status directly with the supplier or datasheet revision history before procurement.

Selection Notes

Select this component when a precision shunt regulator with high-temperature stability is required. The TL431B series offers tighter initial accuracy compared to standard variants. Ensure the application circuit maintains the cathode current between 1.0 mA and 100 mA for optimal regulation. Consider the thermal resistance characteristics of the TO-92 package if significant power dissipation is expected in the design.

Part Context

This part belongs to the TL431 family of programmable precision references, which serve as versatile replacements for traditional Zener diodes. The TL431B variant specifically targets applications demanding higher accuracy than the standard TL431I or C grades. The device integrates internal compensation and latch-up protection, making it suitable for linear ohmmeters, crowbar circuits, and switching converter feedback loops.

Replacement Considerations

Compatible substitutes include other TL431B series parts such as TL431BVLP or TL431BVDR2G, provided the package type and temperature rating match the design requirements. Cross-referencing pinouts and electrical characteristics with the original datasheet is essential to ensure functional equivalence in existing circuits.