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Product Detailed Parameters
- Description：IC VREF SHUNT ADJ 2% 8SOIC
- Series：-
- Mfr：Fairchild Semiconductor
- Package：Tube
- Output Type：Adjustable
- Voltage - Output (Min/Fixed)：2.5V
- Voltage - Output (Max)：36 V
- Current - Output：100 mA
- Operating Temperature：-25°C ~ 85°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 KA431D is a three-terminal adjustable shunt regulator from Fairchild Semiconductor, functioning as a programmable precision reference. It allows output voltage setting between approximately 2.5V and 36V using two external resistors. Key electrical characteristics include a typical dynamic output impedance of 0.2Ω, sink current capability ranging from 1.0mA to 100mA, and an equivalent full-range temperature coefficient of 50ppm/°C. The device features low output noise voltage and fast turn-on response.
Feature Summary
- Programmable output voltage adjustable via external resistors
- Low dynamic output impedance for stable regulation
- Temperature compensated operation across rated ranges
- Fast turn-on response suitable for switching applications
Applications
- Replacement for Zener diodes in voltage reference circuits
- Precision voltage references in power supplies
- Feedback control loops in switching regulators
Procurement Notes
Verify the specific suffix 'D' against official Fairchild or onsemi documentation to confirm package type and tape-and-reel specifications. Ensure compatibility with system requirements regarding thermal stability and operating temperature ranges before procurement.
Selection Notes
Select this component when a precise, programmable shunt reference is required with low dynamic impedance. Consider the 1mA to 100mA sink current range and 50ppm/°C temperature coefficient for applications demanding high stability over varying thermal conditions.
Part Context
The KA431 series belongs to a family of three-terminal adjustable regulators known for thermal stability. Variants like KA431A and KA431L offer different accuracy grades. The KA431D specifically denotes a particular package or ordering configuration within this programmable shunt regulator line.
Replacement Considerations
Compatible substitutes include LM431 and TL431 series devices. Verify pinout compatibility and ensure that the alternative part meets the required sink current and voltage adjustment ranges for the specific circuit design.
