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Product Detailed Parameters
- Description：TWO TERMINAL VOLTAGE REFERENCE,
- Series：-
- Mfr：Fairchild Semiconductor
- Package：Bulk
- Output Type：Adjustable
- Voltage - Output (Min/Fixed)：2.495V
- Voltage - Output (Max)：36 V
- Current - Output：100 mA
- Operating Temperature：-25°C ~ 85°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 KA431AZBU is a three-terminal programmable shunt regulator manufactured by Fairchild Semiconductor. It features an internal reference voltage of approximately 2.5V, with the output voltage adjustable between 2.495V and 36V using two external resistors. The device offers a typical dynamic output impedance of 0.2Ω and supports a sink current range from 1mA to 100mA. It operates within a temperature range of -25°C to +85°C and utilizes a TO-92 package.
Feature Summary
- Programmable output voltage capability up to 36 volts via external resistor network
- Low dynamic output impedance for stable regulation performance
- Temperature compensated operation ensuring thermal stability across rated ranges
Applications
- Voltage references in power supply circuits
- Replacement for Zener diodes requiring sharp turn-on characteristics
- Charger voltage adapters
Procurement Notes
Verify the manufacturer marking on the component body to confirm Fairchild Semiconductor origin, as ON Semiconductor acquired Fairchild's semiconductor business. Ensure the part number suffix matches the specific tolerance and packaging requirements. Cross-reference datasheet revisions to confirm pinout compatibility and electrical parameter consistency before integration into designs.
Selection Notes
Select this component when a precise, adjustable voltage reference is required in a through-hole configuration. Consider the 1% initial accuracy and 50ppm/°C temperature coefficient for applications demanding high stability. Evaluate the 100mA maximum sink current against load requirements to ensure adequate headroom for circuit operation.
Part Context
This device belongs to the KA431 family of programmable shunt regulators, which are widely used as precision voltage references. The KA431 series serves as a direct functional replacement for standard Zener diodes, offering superior performance in terms of impedance and noise. It is commonly found in industrial control systems and consumer electronics power management sections.
Replacement Considerations
The TL431AILPG is listed as a potential substitute by onsemi. Verify pinout alignment and electrical specifications against the original design requirements before substitution.
