TL431BCLPRM

Overview

The TL431BCLPRM is a three-terminal programmable shunt regulator IC from onsemi, housed in a TO-92 (TO-226) package. It operates as a low temperature coefficient zener diode with an adjustable output voltage range from the internal reference up to 36 V. The device features a typical voltage reference tolerance of ±0.4% at 25°C and supports a cathode current range of 1.0 mA to 100 mA. It exhibits a typical dynamic impedance of 0.22 Ω and an equivalent full-range temperature coefficient of 50 ppm/°C.

Feature Summary

• Programmable precision reference utilizing two external resistors for voltage adjustment
• Temperature compensated operation across the rated ambient temperature range
• Low dynamic output impedance ensuring stable regulation performance

Applications

• Feedback control driving optocouplers in power supply circuits
• Digital voltmeter reference stages
• Op amp circuitry requiring stable voltage references
• Constant current source and sink implementations

Procurement Notes

Verify the specific suffix 'M' indicates fan-fold packaging when sourcing replacements. Confirm the 'B' designation matches the required ±0.4% tolerance specification. Ensure the operating temperature range aligns with the 0°C to +70°C rating defined for this variant. Cross-reference the pinout configuration against the TO-92 standard to prevent installation errors during assembly.

Selection Notes

Select this component when a precise, adjustable shunt regulator is required within a compact through-hole form factor. The ±0.4% tolerance suits applications demanding tighter accuracy than standard Zener diodes provide. Consider the thermal resistance characteristics if high power dissipation is anticipated. Verify that the load capacitance requirements fall within the stability boundaries defined in the datasheet curves.

Part Context

This device belongs to the TL431 family of programmable precision references manufactured by onsemi. It serves as a direct replacement for traditional Zener diodes in various analog and digital circuits. The family includes variants with different tolerances and temperature ranges, such as the 'A' series for wider industrial temperatures.

Replacement Considerations

TL431BCLPRMG