ATL432LIBQDBZR-S Texas Instruments Inductor (SOT23 (3-Pin)) In Stock

The Texas Instruments ATL432LIBQDBZR-S is a high-bandwidth, low-Iq programmable shunt voltage regulator with adjustable reference from 1.24 V to 36 V and quiescent current under 100 µA. It features high-bandwidth error amplifier response for stable feedback loops in switching power supplies. Available in a compact SOT-23 3-pin package from authorized distributors worldwide.

ACTIVEInductorVerified Jun 2026

Package / Visual Reference

ATL432LIBQDBZR-SSOT23 (3-Pin)

Quick Facts

Manufacturer: Texas Instruments
Package: SOT23 (3-Pin)
Pin Count: 3
Lifecycle: ACTIVE
Datasheet: ATL432LIBQDBZR-S Datasheet PDF
Category: Inductor
RoHS: Compliant
Lead Time: 3–7 business days
Shipping: DHL Express · Worldwide

What are the key features of ATL432LIBQDBZR-S?

Programmable shunt voltage reference adjustable from 1.24 V to 36 V using two external resistors
Low quiescent current under 100 µA minimizes standby power consumption in efficiency-critical designs
High-bandwidth error amplifier enables stable compensation in high-frequency switch-mode power supplies
SOT-23 3-pin package provides smallest-footprint shunt regulator solution for space-constrained boards

What is ATL432LIBQDBZR-S used for?

The ATL432LIBQDBZR-S is used as a precision voltage reference and feedback element in isolated flyback and buck converter feedback loops operating from 1.24 V to 36 V output rails. Its low Iq makes it ideal for battery-powered devices and standby power circuits where minimizing idle current extends runtime. It also serves as a precision overvoltage detection reference in power management ICs and as a shunt regulator in LED driver feedback paths.

Compliance & Regulatory

RoHS Status	Compliant
Lead-Free	Yes (Pb-Free)

Where can I find the ATL432LIBQDBZR-S datasheet?

ATL432LIBQDBZR-S Datasheet Download

Official datasheet from Texas Instruments

What are equivalent replacements for ATL432LIBQDBZR-S?

Compatible alternatives and drop-in replacements for ATL432LIBQDBZR-S:

ATL432LIBQDBZRTexas Instruments

Two Terminal Voltage Reference, 1 Output, 2.5V, Trim/Adjustable, PDSO3

PATL432LIBQDBZRQ1Texas Instruments

Two Terminal Voltage Reference, 1 Output, 2.5V, Trim/Adjustable, PDSO3

ATL432LIAQDBZRTexas Instruments

Two Terminal Voltage Reference, 1 Output, 2.5V, Trim/Adjustable, PDSO3

ATL432LIAIDBZRTexas Instruments

Two Terminal Voltage Reference, 1 Output, 2.5V, Trim/Adjustable, PDSO3

PATL432LIAQDBZRQ1Texas Instruments

Two Terminal Voltage Reference, 1 Output, 2.5V, Trim/Adjustable, PDSO3

Compare all alternatives & request quotes →

Frequently Asked Questions

How does the ATL432LIBQDBZR-S achieve a programmable output voltage between 1.24 V and 36 V?

The ATL432LIBQDBZR-S sets its regulation voltage using a resistor divider connected to its reference (REF) pin. The output voltage follows V_out = V_ref x (1 + R1/R2), where V_ref is the internal 1.24 V bandgap reference. By selecting R1 and R2 from standard E96 series resistors, designers can program any output voltage from 1.24 V to 36 V with accuracy limited only by resistor tolerance and the internal reference error.

For an isolated flyback converter operating at 200 kHz, how does the ATL432LIBQDBZR-S high-bandwidth error amplifier improve loop stability?

In a 200 kHz flyback converter, the compensation network between the ATL432LIBQDBZR-S and optocoupler must inject enough phase lead to maintain 45° phase margin. The ATL432LIBQDBZR-S's high-bandwidth error amplifier, with a gain-bandwidth product exceeding 1 MHz, allows the designer to place compensation zeros well above the power stage crossover frequency of 20 kHz, avoiding the sluggish transient response that lower-bandwidth references produce in similar topologies.

In a 5 V standby rail for a home appliance, how much idle power does ATL432LIBQDBZR-S save compared to the standard TL431?

The standard TL431 requires a minimum cathode current of 1 mA to regulate, while the ATL432LIBQDBZR-S operates with quiescent current below 100 µA. On a 5 V standby rail, this difference saves approximately 4.5 mW of continuous idle power per unit. Over a product lifetime of 10 years at 8,760 hours/year, the saving amounts to roughly 0.39 kWh per appliance, contributing meaningfully to ErP Tier 2 standby power compliance.

What makes ATL432LIBQDBZR-S preferable to a fixed LDO regulator in a multi-rail power design needing precision trimming?

A fixed LDO locks output voltage at manufacture, requiring a different part number for each target voltage. The ATL432LIBQDBZR-S's 1.24 V to 36 V programmable range with two external resistors covers all secondary rails in a multi-output supply from a single component, reducing BOM complexity and inventory cost. Its shunt topology also eliminates dropout voltage constraints that limit LDO performance when input-output differential is small.

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About Texas Instruments

Texas Instruments (TI) is a global semiconductor company headquartered in Dallas, Texas. TI designs and manufactures analog and embedded processing chips used in industrial, automotive, consumer, communications, and enterprise systems.

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