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Product Detailed Parameters
- Description：IC VREF SHUNT ADJ 1% 8SO
- Series：-
- Mfr：STMicroelectronics
- Package：Tape & Reel (TR),Cut Tape (CT)
- Output Type：Adjustable
- Voltage - Output (Min/Fixed)：2.495V
- Voltage - Output (Max)：36 V
- Current - Output：100 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 TL431ACDT is an adjustable shunt precision voltage reference manufactured by STMicroelectronics. It operates within a supply voltage range of 2.5 V to 36 V and provides an initial accuracy of ±1%. The device supports a cathode current range from 1 mA to 100 mA with a typical dynamic impedance of 0.22 Ω. It is housed in an 8-SOIC surface-mount package and functions reliably across an operating temperature range of 0°C to +70°C.
Feature Summary
- Adjustable output voltage capability between 2.5 V and 36 V using two external resistors
- High thermal stability guaranteed over the entire specified operating temperature range
- Wide cathode current operating range supporting sink currents from 1 mA to 100 mA
Applications
- Precision voltage regulation in switching power supplies
- Optocoupler driver circuits for feedback control
- Portable equipment requiring stable reference voltages
Procurement Notes
Verify the specific suffix 'DT' corresponds to the tape-and-reel packaging format required for automated assembly processes. Confirm that the ±1% tolerance grade meets the circuit's accuracy requirements, as other grades like 'B' offer tighter tolerances. Ensure the SOIC-8 footprint matches the PCB layout design before finalizing procurement orders.
Selection Notes
Select this component when a standard 2.5 V to 36 V adjustable reference is needed in a surface-mount form factor. The ±1% accuracy is suitable for general-purpose applications where higher precision is not critical. Consider the 0°C to +70°C commercial temperature range; automotive or industrial wide-temperature variants are available if environmental conditions exceed these limits.
Part Context
This part belongs to the TL431 family of programmable shunt voltage references. These devices function similarly to zener diodes but offer superior performance characteristics, including lower dynamic impedance and fully programmable output voltage. The family serves as a fundamental building block for linear regulators and isolated power supply feedback loops.
Replacement Considerations
Compatible substitutes include the TL431ACDR (Texas Instruments) and the KA431AZLFT (Diodes Inc.). Verify pinout compatibility and electrical specifications such as initial accuracy and operating temperature range before substituting.
