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Product Detailed Parameters
- Description：IC VREF SHUNT ADJ 1% 8SOIC
- Series：-
- Mfr：Infineon Technologies
- Package：Tape & Reel (TR)
- Output Type：Adjustable
- Voltage - Output (Min/Fixed)：1.24V
- Voltage - Output (Max)：15 V
- Current - Output：10 mA
- Operating Temperature：0°C ~ 70°C (TA)
- Mounting Type：Surface Mount
- Package / Case：8-SOIC (0.154", 3.90mm Width)
- Supplier Device Package：8-SOIC
- Grade：-
- Qualification：-
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Overview
The IRU431L is a three-terminal adjustable shunt regulator and precision voltage reference. It provides an internal reference of 1.24V with 1% initial accuracy. The output voltage is programmable from 1.24V to 15V using two external resistors. Key electrical specifications include a maximum quiescent current of 80µA, a typical dynamic impedance of 0.25Ω, and a cathode current range of -15mA to +15mA. Operating temperatures range from 0°C to 70°C. Available packages include 5-pin SOT-23 (IRU431LCL5), 3-pin SOT-23 (IRU431LCL3), and 8-pin SOIC (IRU431LCS).
Feature Summary
- Unconditionally stable operation when a minimum 1µF capacitor is connected between the cathode and anode pins.
- Low operating cathode current requirement with a maximum quiescent current of 80µA prior to regulation.
- Pin-to-pin compatible with TLV431 devices for simplified design integration.
Applications
- Linear regulator controller
- Secondary side controller for low voltage power supply applications
- Precision voltage reference for battery type applications
Procurement Notes
Verify package selection against thermal requirements; the 8-pin SOIC offers higher power dissipation than SOT-23 variants. Confirm ambient temperature constraints align with the specified 0°C to 70°C operating range. Ensure circuit stability by including the required 1µF cathode-to-anode capacitor or verifying cathode current exceeds 3mA if using smaller capacitance values.
Selection Notes
Select the appropriate package based on thermal management needs and board space constraints. The 8-pin SOIC supports up to 775mW at 25°C, while SOT-23 packages are limited to 150mW. Verify that the application's input voltage does not exceed the 15V absolute maximum rating. Consider the 1% reference accuracy for high-precision voltage setting requirements.
Part Context
The IRU431L belongs to the family of low-voltage adjustable precision shunt regulators. These components serve as alternatives to Zener diodes, offering superior voltage regulation and lower dynamic impedance. They are commonly utilized in feedback loops for switching power supplies and as stable references in analog circuits requiring precise voltage control.
Replacement Considerations
The datasheet explicitly states pin-to-pin compatibility with the TLV431. Designers may substitute this component with the TLV431 without modifying the PCB footprint or basic biasing resistor network configuration.
