LT1431CZ#PBF

Voltage Reference Overview

The LT1431CZ#PBF is a programmable shunt voltage regulator in a 3-lead TO-92 package. It features a nominal 2.5V reference with a guaranteed initial tolerance of ±0.4% and a typical temperature coefficient of 30ppm/°C. The device supports an output voltage range from 2.5V to 36V when configured with external resistors. It provides a sink current capability between 1mA and 100mA, with a dynamic output impedance of approximately 0.1Ω. The operating temperature range is specified from 0°C to 70°C.

Voltage Reference Feature Summary

• Adjustable shunt regulation with internal divider for standalone 5V operation
• High precision initial voltage tolerance and low temperature drift
• Pin-compatible with TL431 for simplified design upgrades

Voltage Reference Applications

• Linear regulators
• Adjustable power supplies
• Switching power supplies

Voltage Reference Procurement Notes

Verify the specific suffix #PBF indicates lead-free compliance and RoHS status before procurement. Confirm that the Z package (TO-92) matches the required through-hole mounting constraints. Ensure the 0°C to 70°C commercial temperature rating aligns with the environmental conditions of the target application.

Voltage Reference Selection Notes

Select this component when a pin-compatible replacement for TL431 is needed with tighter initial voltage accuracy. The 3-lead configuration simplifies layout compared to 8-pin variants. Consider the 100mA sink limit and 36V maximum voltage rating to ensure adequate headroom for the intended circuit design requirements.

Voltage Reference Part Context

This part belongs to the LT1431 family of programmable references manufactured by Analog Devices Inc. The 'C' designation specifies the commercial temperature grade, while 'Z' denotes the 3-lead plastic TO-92 package. The '#PBF' suffix confirms the use of lead-free terminations compliant with international environmental standards.

Voltage Reference Replacement Considerations

LT1431IZ#PBF

Voltage Reference FAQ

How does the LT1431CZ achieve 5V regulation without external components?

Internal on-chip divider resistors connect the RTOP and RMID pins internally, allowing the device to function as a precise 5V shunt regulator when the cathode is tied to V+.

What is the minimum operating current for the LT1431CZ?

The minimum operating current is typically 1mA, ensuring stable regulation across the specified load range.