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Product Detailed Parameters
- Description：IC VREF SHUNT ADJ 1% SOT23-5
- Series：-
- Mfr：Microsemi Corporation
- Package：Tube
- Output Type：Adjustable
- Voltage - Output (Min/Fixed)：1.24V
- Voltage - Output (Max)：20 V
- Current - Output：20 mA
- Operating Temperature：-40°C ~ 85°C (TA)
- Mounting Type：Surface Mount
- Package / Case：SC-74A, SOT-753
- Supplier Device Package：SOT-23-5
- Grade：-
- Qualification：-
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Overview
The LX432ISE is a low-voltage precision adjustable shunt regulator manufactured by Microsemi. It features an internal reference voltage of 1.24V and allows output voltage adjustment from VREF to 20V using two external resistors. The device operates with a minimum cathode current of 80µA, making it suitable for micropower applications. It offers a typical dynamic impedance of less than 250mΩ and maintains an initial voltage reference accuracy of 1%. The LX432ISE is housed in a 5-pin plastic SOT-23 package (SE) and supports an operating temperature range of -40°C to 85°C.
Feature Summary
- Provides a stable 1.24V internal reference voltage with 1% initial accuracy.
- Enables adjustable output voltage ranging from the reference level up to 20V via external resistor networks.
- Features low dynamic impedance for improved load regulation performance.
- Operates efficiently with a minimum sink current capability starting at 80µA.
Applications
- Low voltage adjustable power supplies
- Instrumentation circuits
- Portable equipment
- Computers
Procurement Notes
Verify that the specific part number LX432ISE corresponds to the industrial temperature grade (-40°C to 85°C) and the 5-pin SE plastic SOT-23 package configuration. Confirm compatibility with existing circuit designs requiring a direct alternative to TLV431 or SC431L devices. Ensure proper handling procedures are followed as the component is sensitive to electrostatic discharge during installation.
Selection Notes
Select this component when designing low-power systems requiring precise voltage referencing without high quiescent current draw. The LX432ISE is appropriate for isolated feedback loops in low-voltage power supplies where the minimum output voltage must accommodate opto-coupler forward voltage drops. Consider the 5-pin package availability if board space constraints favor the SOT-23 form factor over other options.
Part Context
This device belongs to the LX432 series of low-voltage adjustable precision shunt regulators produced by Microsemi's Linfinity Microelectronics Division. The series is designed to serve as a drop-in replacement for industry-standard components like the TLV431 and SC431L. The LX432 family provides versatile solutions for voltage regulation tasks across commercial and industrial environments.
Replacement Considerations
The LX432ISE is documented as a direct alternative to the TLV431 and SC431L devices. Designers should verify pinout compatibility and electrical parameter alignment before substituting these parts in existing schematics.
FAQ
What is the minimum cathode current required for the LX432ISE to maintain regulation?
The device requires a minimum cathode current of 80µA to ensure proper regulation operation.
Can the LX432ISE be used in isolated power supply feedback loops?
Yes, the datasheet explicitly lists its use in the feedback loop of isolated low voltage power supplies.
