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Product Detailed Parameters
- Description：IC VREF SHUNT ADJ 0.4% TO92-3
- Series：-
- Mfr：Texas Instruments
- Package：Bulk,Bulk
- Output Type：Adjustable
- Voltage - Output (Min/Fixed)：2.5V
- Voltage - Output (Max)：36 V
- Current - Output：100 mA
- Operating Temperature：0°C ~ 70°C (TA)
- Mounting Type：Through Hole
- Package / Case：TO-226-3, TO-92-3 (TO-226AA)
- Supplier Device Package：TO-92-3
- Grade：-
- Qualification：-
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Overview
The TL1431CLP is a precision programmable shunt voltage reference manufactured by Texas Instruments, housed in a TO-92 (TO-226AA) three-pin package. It provides an adjustable output voltage ranging from approximately 2.5 V to 36 V using two external resistors. The device features a typical dynamic output impedance of 0.2 Ω and supports a cathode current range from 1 mA to 100 mA. Characterized for commercial operation between 0°C and 70°C, it offers an initial voltage tolerance of 0.4% at 25°C.
Feature Summary
- Adjustable output voltage settable between 2.5 V and 36 V via external resistive divider
- High precision with 0.4% initial voltage tolerance at 25°C
- Low dynamic output impedance of 0.2 Ω for stable regulation
- Fast turn-on characteristic suitable for Zener diode replacement
Applications
- Secondary side regulation in flyback switching power supplies
- Onboard voltage monitoring and comparator applications with integrated reference
- Precision voltage and current referencing circuits
- Replacement for Zener diodes in onboard regulation tasks
Procurement Notes
Verify the specific suffix CLP corresponds to the TO-92 package and commercial temperature range (0°C to 70°C). Confirm RoHS compliance status through official documentation. Ensure design accounts for the minimum cathode current requirement of 1 mA for proper regulation. Validate thermal resistance parameters against system dissipation requirements.
Selection Notes
Select this component when a low-cost, high-precision shunt reference is required for commercial temperature environments. The TO-92 package is suitable for through-hole mounting. Consider the 0.4% initial accuracy and 0.2 Ω output impedance for applications demanding tight voltage regulation. Verify that the load capacitance remains within stability boundaries defined in the datasheet.
Part Context
The TL1431 series includes variants for different temperature ranges: TL1431C for commercial (0°C to 70°C), TL1431Q for automotive (-40°C to 125°C), and TL1431M for military (-55°C to 125°C). The CLP suffix specifically denotes the commercial grade version in the TO-92 package. This family serves as a fundamental analog building block for error amplifiers and voltage clamps.
Replacement Considerations
TL1431CLPR is a recommended manufacturer alternative in tape-and-reel packaging.
FAQ
What is the minimum cathode current required for regulation?
The device requires a minimum cathode current (Imin) of 1 mA to ensure proper regulation and sufficient open-loop gain.
Is the TL1431 internally compensated?
Yes, the TL1431 is internally compensated to be stable without an output capacitor between the cathode and anode pins.
