TL431CDBVT

Overview

The TL431CDBVT is an adjustable precision shunt regulator manufactured by Texas Instruments, housed in a five-pin SOT-23 surface-mount package. It operates within a voltage range of 2.5V to 36V, with a maximum output current capability of 100mA and an initial accuracy tolerance of ±2.2%. The device functions as a three-terminal reference, featuring a cathode for shunt current input, an anode typically grounded, and a reference pin for threshold control relative to the common anode. Designed for industrial environments, it supports operation from -40°C to +85°C, ensuring stable performance across varying thermal conditions while maintaining low dynamic impedance.

Feature Summary

• Provides precise programmable voltage reference functionality through an adjustable shunt regulation topology
• Integrates a low dynamic impedance internal bandgap reference structure for stable operation
• Supports direct replacement for discrete Zener diode configurations in feedback loops

Applications

• Precision voltage reference sources in analog signal conditioning circuits
• Feedback loop compensation networks in switching power supplies
• Programmable threshold detection and comparator reference applications

Procurement Notes

Verify the specific suffix 'C' confirms the ±2.2% initial accuracy grade rather than higher precision variants. Confirm the 'DBVT' designation matches the required SOT-23-5 package dimensions and thermal characteristics. Ensure the operating temperature range aligns with the intended environmental constraints, as commercial grades may differ from extended industrial specifications. Cross-reference the manufacturer datasheet for any recent product change notifications affecting assembly sites or marking conventions.

Selection Notes

Select this component when a compact surface-mount solution is required for adjustable voltage referencing with moderate accuracy needs. The SOT-23-5 form factor offers space efficiency compared to larger packages like SOIC-8 or TO-92. Consider the 100mA cathode current limit against load requirements; if lower quiescent current is critical, evaluate the TLV431 family instead. Ensure the 36V maximum voltage rating exceeds the circuit's peak operating potential to prevent breakdown.

Part Context

This part belongs to the widely adopted TL431 family of adjustable precision shunt regulators, established as a standard industry reference component. The DBVT variant specifically adapts the traditional three-terminal reference concept into a modern surface-mount footprint suitable for automated PCB assembly. It serves as a foundational building block for linear and switching power supply designs requiring stable, programmable voltage thresholds without complex external circuitry.