TL431BCP

Overview

The TL431BCP is a three-terminal programmable shunt regulator diode from onsemi, housed in an 8-pin PDIP package. It operates 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 a typical full-range temperature coefficient of 50 ppm/°C. The operating ambient temperature range for this specific suffix is 0°C to +70°C.

Feature Summary

• Three-terminal programmable precision reference functioning as a low temperature coefficient Zener diode
• High accuracy voltage reference with ±0.4% tolerance at 25°C
• Wide operating current capability ranging from 1.0 mA to 100 mA
• Temperature compensated operation over the rated commercial temperature range

Applications

• Digital voltmeters
• Power supplies
• Op amp circuitry
• Shunt regulators

Procurement Notes

Verify that the ordering suffix 'CP' corresponds to the PDIP-8 package and the 0°C to +70°C operating temperature range. Confirm the 'B' designation indicates the ±0.4% voltage reference tolerance. Ensure compliance requirements match the application needs, noting that Pb-free variants may carry a 'G' suffix.

Selection Notes

Select the TL431BCP when a precise, adjustable voltage reference is required within a commercial temperature environment. The PDIP-8 package is suitable for through-hole mounting applications. Consider the ±0.4% tolerance if tighter regulation than the standard 'C' variant is necessary. Verify stability boundary conditions regarding load capacitance and cathode current for the specific circuit topology.

Part Context

This component belongs to the TL431, A, B Series and NCV431A, B family of programmable precision references manufactured by onsemi. These devices are designed to replace traditional Zener diodes in various analog and power management circuits. The series offers multiple package options including SOIC, Micro8, TO-92, and PDIP, catering to diverse board space and thermal requirements.

Replacement Considerations

Compatible substitutes include TL431ACD (SOIC-8), TL431BCDR2 (SOIC-8 Tape & Reel), and TL431BCLP (TO-92). When replacing, ensure the alternative part matches the required tolerance ('B' grade) and the operating temperature range (Commercial 0°C to +70°C). Package pinouts must be verified for compatibility.