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TL432

Name: TL432
Rating: 4.7 (12 reviews)

IC VREF SHUNT ADJ 1% SOT23-3

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規格

Part Status	Active
Reference Type	Shunt
Output Type	Adjustable
Voltage - Output (Min/Fixed)	1.24V
Current - Output	100 mA
Tolerance	±1%
Operating Temperature	-40°C ~ 125°C (TA)
Packaging	Cut Tape (CT), Tape & Reel (TR)
Current - Cathode	80 µA
Voltage - Output (Max)	18 V

概述

Description

TL432 is a programmable shunt regulator (precision reference), similar to TL431. It provides a fixed 2.495 V reference and uses the cathode to regulate a node by sinking current when the REF pin sees about 2.495 V above the anode.
Key points:
- 3 pins: REF, ANODE, CATHODE.
- By choosing a resistor divider from the output to REF (and to ground), you set the regulated output voltage.
- It’s used as an inexpensive feedback/reference in linear regulators, DC-DC controllers, or as an adjustable Zener substitute.
- Typical range: cathode-to-anode voltage up to tens of volts (often ~36 V max, depending on variant); requires a minimum operating current to regulate.
- Available in common packages (SOT-23, TO-92) from multiple manufacturers.
In short: a simple, low-cost, adjustable shunt reference for regulating voltages in power-supply feedback and reference circuits.

Features

Here are the key features of TL432 (three-terminal programmable shunt regulator):
- Internal 2.495 V reference
- External resistor divider on Ref pin sets regulation threshold
- Three-terminal device: Anode, Cathode, Reference
- Wide operating input/output range (up to ~36 V across A–K)
- Sinks current to regulate output (shunt regulator); typical current up to ~100 mA
- High accuracy with low dynamic impedance; good line and load regulation
- Internal current limit and thermal/shutdown protection
- Can be used as a precision zener substitute or in regulator/reference applications
- Suitable for voltage references, reference supplies, and overvoltage protection schemes
Note: Exact ratings (voltage range, max current) can vary by package/version, so check the specific datasheet for your part.

Package

TL432 is a three-terminal adjustable shunt regulator (similar to TL431). It is offered mainly in surface-mount packages: SOT-23-3 (and variants like SOT-89-3 or SOT-223 in some lines); through-hole TO-92 versions exist from some vendors. Always verify the specific device’s datasheet for the exact package options.

Pinout

- Pin count: 3 pins
- Function: adjustable precision shunt regulator (programmable zener). It provides a fixed reference (≈2.495 V) and shunts current to regulate a voltage via an external divider (used in power-supply feedback).

Manufacturer

- Manufacturer: Texas Instruments (TI).
- About the company: TI is an American multinational that designs and manufactures semiconductors and integrated circuits, including analog, linear, and mixed-signal devices; one of the world’s largest chipmakers.

Application

- Precise adjustable shunt regulator with a 2.5V reference
- Programmable voltage reference for linear and switching power-supply feedback (with optocoupler)
- Voltage or constant-current LED driver applications
- Battery charger regulation and protection circuits
- Precision threshold detector/comparator in protection circuits
- Simple, low-cost voltage reference for instrumentation and test equipment

Equivalent

TL432 is a 3-terminal adjustable shunt regulator (programmable reference), effectively a TL431-family device. Equivalents from other vendors include:
- TL431 (TI)
- TLV431 / LMV431 (TI/Analog)
- LM431 (National/TI)
- KA431 / KA431A (ROHM)
- AZ431 / AZ431A (Diodes Inc.)
- NCP431 (Onsemi)
All provide a ~2.495 V reference with similar use; check pinout and max ratings for drops-in substitutions.