LT1129MPST-3.3#PBF Analog Devices Integrated Circuit (SOT223 (3-Pin)) In Stock

Name: LT1129MPST-3.3#PBF
Brand: Analog Devices
SKU: LT1129MPST-3.3#PBF
Availability: InStock

The LT1129MPST-3.3#PBF is a 700 mA micropower low-dropout LDO regulator with a fixed 3.3 V output, shutdown pin, and 0.45 V typical dropout voltage in a SOT-223 package. It accepts input voltages from 3.8 V to 20 V and is ideal for battery-powered and automotive supplies. Available from stock with worldwide shipping.

ACTIVEIntegrated CircuitVerified Jun 2026

Package / Visual Reference

LT1129MPST-3.3#PBFSOT223 (3-Pin)

Quick Facts

Manufacturer: Analog Devices
Package: SOT223 (3-Pin)
Pin Count: 3
Lifecycle: ACTIVE
Datasheet: LT1129MPST-3.3#PBF Datasheet PDF
Category: Integrated Circuit
Price: From $12.0200(MOQ 1)
RoHS: Compliant
Lead Time: 3–7 business days
Shipping: DHL Express · Worldwide

What are the key features of LT1129MPST-3.3#PBF?

700 mA output current capability with only 0.45 V typical dropout voltage, maximizing battery life in low-voltage systems
Wide input voltage range from 3.8 V to 20 V with absolute maximum rating of 30 V for rugged automotive and industrial use
Integrated shutdown pin enabling microcontroller-controlled power sequencing and sleep-mode current reduction
Fixed 3.3 V output in a compact SOT-223 package with exposed tab for efficient thermal management on standard PCBs

What is LT1129MPST-3.3#PBF used for?

The LT1129MPST-3.3#PBF is designed for battery-powered portable equipment, automotive accessories, and industrial sensors requiring a stable 3.3 V rail from higher-voltage inputs. Its 700 mA output and low 0.45 V dropout enable efficient regulation from Li-Ion cells or automotive 12 V buses with minimal heat dissipation. The shutdown pin simplifies power management in multi-rail embedded systems where sub-circuits must be selectively powered down to extend battery runtime.

What are the specifications of LT1129MPST-3.3#PBF?

Pbfree Code	No
Manufacturer Package Code	05-08-1630
YTEOL	10
Adjustability	FIXED
Dropout Voltage1-Max	0.7V
Dropout Voltage1-Nom	0.45V
Input Voltage Absolute-Max	30V
Input Voltage-Max	20V
Input Voltage-Min	3.8V
JESD-30 Code	R-PSSO-G3
JESD-609 Code	e3
Line Regulation-Max	0.01%
Load Regulation-Max	0.03%
Number of Functions	1
Number of Outputs	1
Operating Temperature TJ-Max	125°C
Operating Temperature TJ-Min	-55 °C
Output Current1-Max	0.7A
Output Voltage1-Max	3.4V
Output Voltage1-Min	3.2V
Output Voltage1-Nom	3.3V
Package Body Material	PLASTIC/EPOXY
Package Equivalence Code	SOT-223
Package Shape	RECTANGULAR
Package Style	SMALL OUTLINE
Peak Reflow Temperature (Cel)	260
Qualification Status	Not Qualified
Regulator Type	FIXED POSITIVE SINGLE OUTPUT LDO REGULATOR
Surface Mount	YES
Technology	BIPOLAR
Terminal Finish	Matte Tin (Sn)
Terminal Form	GULL WING
Terminal Pitch	2.3mm
Terminal Position	SINGLE
Time@Peak Reflow Temperature-Max (s)	30
Voltage Tolerance-Max	3%
Package	SOT223 (3-Pin)

Compliance & Regulatory

RoHS Status	Compliant
Lead-Free	Yes (Pb-Free)
Moisture Sensitivity Level	MSL 1
ECCN	EAR99
HTS Code	8542.39.00.01
Country of Origin	Thailand

Where can I find the LT1129MPST-3.3#PBF datasheet?

LT1129MPST-3.3#PBF Datasheet Download

Official datasheet from Analog Devices

What are equivalent replacements for LT1129MPST-3.3#PBF?

No known alternates. Submit an RFQ and our team can suggest alternatives.

Frequently Asked Questions

What is the dropout voltage of the LT1129MPST-3.3#PBF, and how does this affect battery-powered system design?

The LT1129MPST-3.3#PBF has a typical dropout voltage of 0.45 V and a maximum of 0.7 V at 700 mA load. This means the device maintains a regulated 3.3 V output until the input drops to approximately 3.75 V to 4.0 V, extracting more usable charge from Li-Ion or alkaline batteries compared to standard LDOs with 1.2 V or higher dropout voltages.

How does the shutdown pin on the LT1129MPST-3.3#PBF improve power management in embedded designs?

The active-low shutdown pin disables the regulator output, reducing supply current to microamp-level quiescent draw. This allows a host microcontroller or power management IC to selectively cut the 3.3 V rail to peripherals during sleep modes, enabling significant runtime extension in battery-powered IoT nodes, sensor modules, and portable instruments operating from 3.8 V to 20 V input sources.

For a 12 V automotive accessory design needing a 3.3 V rail, why choose the LT1129MPST-3.3#PBF over a standard LDO?

The LT1129MPST-3.3#PBF tolerates input voltages up to 20 V with a 30 V absolute maximum, making it robust against automotive load-dump transients and 12 V cold-crank conditions. Its 700 mA output handles typical MCU and communication module loads, while the low dropout and SOT-223 package with exposed tab manage the power dissipation from a nominal 12 V to 3.3 V conversion efficiently.

What thermal performance does the SOT-223 package provide for the LT1129MPST-3.3#PBF at high load currents?

The SOT-223 package includes an exposed metal tab connected to the output pin, providing a thermal path to the PCB copper pour. With adequate copper area, junction-to-ambient thermal resistance can be reduced to approximately 40-60 °C/W, allowing the device to sustain 700 mA output with an 8 V to 10 V input-to-output differential without exceeding the maximum junction temperature of 125 °C in typical ambient conditions.

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Analog Devices (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing integrated circuits used in virtually all types of electronic equipment.

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AvailabilityIn Stock

Reference Price (USD)

From $12.0200

Buy from 1pc · Factory-direct pricing

Qty.	Unit Price	Ext. Price
1+	$22.1200	$22.12
10+	$15.8080	$158.08
234+	$15.4100	$3605.94
1000+	$12.0200	$12020.00

pcs

Unit price: $22.1200 · Total: $22.12

In Stock · 24h Response · Worldwide Shipping

Direct Contact

WhatsApp Inquiry Email RFQ

Lead Time3-7 business days

MOQFrom 1 piece

ShippingDHL / FedEx / UPS

OriginChina (Authorized)

Response within 24 hours · Worldwide shipping

“The anti-counterfeit verification gave us confidence we'd never had with other China suppliers.”

Rajesh Patel

Procurement Manager, VoltEdge Energy, India

LT1129MPST-3.3#PBF Analog Devices Integrated Circuit (SOT223 (3-Pin)) In Stock

What are the key features of LT1129MPST-3.3#PBF?

What is LT1129MPST-3.3#PBF used for?

What are the specifications of LT1129MPST-3.3#PBF?

Compliance & Regulatory

Where can I find the LT1129MPST-3.3#PBF datasheet?

What are equivalent replacements for LT1129MPST-3.3#PBF?

Frequently Asked Questions

What is the dropout voltage of the LT1129MPST-3.3#PBF, and how does this affect battery-powered system design?

How does the shutdown pin on the LT1129MPST-3.3#PBF improve power management in embedded designs?

For a 12 V automotive accessory design needing a 3.3 V rail, why choose the LT1129MPST-3.3#PBF over a standard LDO?

What thermal performance does the SOT-223 package provide for the LT1129MPST-3.3#PBF at high load currents?

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