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Product Detailed Parameters
- Description：IC VREF SHUNT ADJ 0.5% SOT23-3
- Series：-
- Mfr：Texas Instruments
- 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：-40°C ~ 85°C (TA)
- Mounting Type：Surface Mount
- Package / Case：TO-236-3, SC-59, SOT-23-3
- Supplier Device Package：SOT-23-3
- Grade：-
- Qualification：-
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Overview
The TL431BIDBZR is a three-terminal adjustable precision shunt regulator manufactured by Texas Instruments. It operates within an ambient temperature range of -40°C to +85°C and utilizes a SOT-23-3 surface-mount package. The device features a reference voltage tolerance of ±0.5% and supports an output voltage range from 2.495V to 36V, set via two external resistors. Key electrical specifications include a maximum sink current of 100 mA, a minimum cathode current of 700 µA, and a typical output impedance of 0.2 Ω.
Feature Summary
- Programmable output voltage capability up to 36 V using external resistors
- High accuracy with a reference voltage tolerance of ±0.5%
- Low output impedance for stable regulation performance
- Automotive grade qualification under AEC-Q100 standards
Applications
- Shunt regulator circuits
- Precision current limiter designs
- Precision constant current sinks
- Isolated feedback loops in Switch Mode Power Supplies (SMPS)
Procurement Notes
Verify the specific suffix 'DBZR' confirms the SOT-23-3 package and tape-and-reel delivery format. Ensure the 'I' designation matches the required -40°C to +85°C operating temperature range for your application environment. Confirm that the ±0.5% tolerance meets system accuracy requirements before finalizing procurement orders.
Selection Notes
Select this component when high precision is required alongside automotive reliability standards. The ±0.5% tolerance offers superior accuracy compared to standard grades. The SOT-23-3 package provides space efficiency for compact board layouts. Consider the 100 mA sink current limit when designing load requirements for power supply feedback networks.
Part Context
This device belongs to the TL431 family of programmable shunt regulators. It serves as a direct replacement for Zener diodes in applications requiring precise voltage referencing. The family includes variants with different tolerances and temperature ranges, such as the TL431C and TL431A series, allowing designers to balance cost and performance needs.
Replacement Considerations
Compatible substitutes include TL431ACDBZR, TL431BCDBZR, and TL431AQDBZR. Verify pinout compatibility and thermal characteristics when substituting. Ensure the alternative part meets the same AEC-Q100 automotive qualification if used in vehicle electronics.
FAQ
What is the minimum cathode current required for proper operation?
The device requires a minimum cathode current of 700 µA to maintain regulation within specified parameters.
Is this component qualified for automotive applications?
Yes, the TL431BIDBZR is AEC-Q100 Grade 1 qualified for use in automotive environments.
How is the output voltage determined?
The output voltage is programmable between 2.495V and 36V by connecting two external resistors to the reference pin.
