LM2671N-3.3 Texas Instruments Integrated Circuit (Dual-In-Line Packages) In Stock

Name: LM2671N-3.3
Brand: Texas Instruments
SKU: LM2671N-3.3
Availability: InStock

LM2671N-3.3 is a SIMPLE SWITCHER voltage-mode PWM step-down switching regulator by Texas Instruments, providing a fixed 3.3 V output in an 8-pin DIP package. Key specs: 6.5 V to 40 V input range, 500 mA output current. In stock with worldwide shipping.

OBSOLETEIntegrated CircuitVerified Jun 2026

Package / Visual Reference

LM2671N-3.3Dual-In-Line Packages

Quick Facts

Manufacturer: Texas Instruments
Package: Dual-In-Line Packages
Pin Count: 8
Lifecycle: OBSOLETE
Datasheet: LM2671N-3.3 Datasheet PDF
Category: Integrated Circuit
Temp Range: -40.0°C to 125.0°C
RoHS: Compliant
Lead Time: 3–7 business days
Shipping: DHL Express · Worldwide

What are the key features of LM2671N-3.3?

Fixed 3.3 V output with voltage-mode PWM control for stable regulation across 6.5 V to 40 V input
500 mA output current in a through-hole 8-pin DIP package for easy prototyping and industrial designs
SIMPLE SWITCHER architecture minimizes external component count for rapid, low-cost buck converter implementation

What is LM2671N-3.3 used for?

LM2671N-3.3 suits industrial control systems and embedded designs that need a compact 3.3 V rail from a 12 V or 24 V supply bus, where its 6.5 V to 40 V input tolerance covers automotive 12 V and industrial 24 V rails with margin. The SIMPLE SWITCHER design requires minimal external passives—inductor, capacitors, and diode—enabling fast prototyping in DIP-friendly breadboards or through-hole PCBs. It is commonly used in remote sensor nodes, PLC analog I/O cards, and legacy industrial equipment powered from unregulated adapters.

What are the specifications of LM2671N-3.3?

Pbfree Code	No
YTEOL	0
Analog IC - Other Type	SWITCHING REGULATOR
Control Mode	VOLTAGE-MODE
Control Technique	PULSE WIDTH MODULATION
Input Voltage-Max	40V
Input Voltage-Min	6.5V
Input Voltage-Nom	12V
JESD-30 Code	R-PDIP-T8
JESD-609 Code	e0
Number of Functions	1
Output Current-Max	1.25A
Output Voltage-Nom	3.3V
Package Body Material	PLASTIC/EPOXY
Package Equivalence Code	DIP8,.3
Package Shape	RECTANGULAR
Package Style	IN-LINE
Qualification Status	Not Qualified
Surface Mount	NO
Switcher Configuration	BUCK
Switching Frequency-Max	275kHz
Technology	NMOS
Temperature Grade	AUTOMOTIVE
Terminal Finish	TIN LEAD
Terminal Form	THROUGH-HOLE
Terminal Pitch	2.54mm
Terminal Position	DUAL
Package	Dual-In-Line Packages

Compliance & Regulatory

RoHS Status	Compliant
Lead-Free	Yes (Pb-Free)
Moisture Sensitivity Level	MSL 1
ECCN	EAR99
HTS Code	8542.39.00.60

Where can I find the LM2671N-3.3 datasheet?

LM2671N-3.3 Datasheet Download

Official datasheet from Texas Instruments

What are equivalent replacements for LM2671N-3.3?

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

Frequently Asked Questions

Which input voltage rails can LM2671N-3.3 regulate from, and what headroom is needed above the 3.3 V output?

LM2671N-3.3 accepts input voltages from 6.5 V to 40 V, requiring at least 3.2 V of headroom above the 3.3 V output. This means a 5 V input is insufficient, but a 7.2 V or higher input works reliably. The 40 V maximum input makes it compatible with 12 V automotive, 24 V industrial, and 36 V lead-acid battery systems without additional protection components.

How many external components does LM2671N-3.3 require, and what is the minimum BOM for a 500 mA output design?

LM2671N-3.3 follows the SIMPLE SWITCHER approach and requires approximately 4 to 5 external components: a 100 µH to 150 µH inductor, a 100 µF input capacitor, a 100 µF output capacitor, and a Schottky catch diode rated for at least 1 A at 40 V. This compact BOM fits on a 50 mm × 30 mm PCB area, making it ideal for space-constrained retrofit designs or 500 mA sub-regulation from a 24 V industrial bus.

How does LM2671N-3.3's efficiency compare to a 7833 linear regulator at 500 mA from a 12 V input?

At 500 mA from 12 V to 3.3 V, a 7833 linear regulator dissipates (12 V - 3.3 V) × 0.5 A = 4.35 W as heat, requiring a heatsink. LM2671N-3.3 as a switching regulator achieves roughly 80% to 85% efficiency, dissipating only about 0.6 W to 0.8 W total—an 80% reduction in power loss. This eliminates the heatsink, reduces PCB temperature, and extends component lifetime in enclosed industrial enclosures.

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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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LM2671N-3.3 Texas Instruments Integrated Circuit (Dual-In-Line Packages) In Stock

What are the key features of LM2671N-3.3?

What is LM2671N-3.3 used for?

What are the specifications of LM2671N-3.3?

Compliance & Regulatory

Where can I find the LM2671N-3.3 datasheet?

What are equivalent replacements for LM2671N-3.3?

Frequently Asked Questions

Which input voltage rails can LM2671N-3.3 regulate from, and what headroom is needed above the 3.3 V output?

How many external components does LM2671N-3.3 require, and what is the minimum BOM for a 500 mA output design?

How does LM2671N-3.3's efficiency compare to a 7833 linear regulator at 500 mA from a 12 V input?

Related Guides

CSD87313DMS Synchronous Buck Power Stage Design Guide

STEF05SGR eFuse Selection Guide for 5 V Overcurrent Protection

C0402C103K3RACTU Selection Guide: Choosing a 10 nF 0402 MLCC

STM32H753VIT6 MCU Selection Guide: Memory, Package, Connectivity, and Security

Why Buy from FindMyChip

About Texas Instruments

More from Texas Instruments

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