LM2671N-3.3 Equivalent & Substitute Parts Engineering Reference

Part Overview

The Texas Instruments LM2671N-3.3 is a Power Management IC (PMIC) from the SIMPLE SWITCHER® series, functioning as a Buck Switching Regulator IC (Step-Down). It provides a fixed positive 3.3V output at up to 500mA from an input range of 6.5V to 40V, housed in a through-hole 8-DIP (0.300", 7.62mm) package. The part is classified as Obsolete, which necessitates identification of substitute models to ensure availability for ongoing and new designs.

Substiute Parts

LM2671N-3.3

Texas InstrumentsIn Stock: 3850LM2671N-3.3 Datasheet

Current PartRFQ

LM2671N-3.3/NOPB

Texas InstrumentsIn Stock: 1097LM2671N-3.3/NOPB Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute selection for LM2671N-3.3 is based strictly on identical manufacturer, product series, function (Step-Down), topology (Buck), output configuration (positive fixed 3.3V), current rating (500mA), voltage range (6.5V-40V), switching frequency (260kHz), package footprint (8-DIP), mounting type (Through Hole), and compliance status. Only parts matching these key parameters are included as substitutes.

Parameter Comparison

Engineering Selection Recommendations

The LM2671N-3.3/NOPB is listed as the direct substitute with an identical electrical and mechanical specification set. The LM2671N-3.3 is obsolete and RoHS non-compliant, while LM2671N-3.3/NOPB is active and ROHS3 compliant. Both share identical ECCN and REACH status. For designs requiring RoHS compliance or continued production support, selection of LM2671N-3.3/NOPB is substantiated by product status and regulatory compliance.

Frequently Asked Questions (FAQ)

Q1: What are the electrical compatibility criteria for substituting LM2671N-3.3?
A1: Substitution requires identical input voltage range (6.5V - 40V), output voltage (fixed 3.3V), output current (500mA), switching frequency (260kHz), and Step-Down (Buck) topology. Mechanical footprint must also match.

Q2: Does package compatibility affect substitution for LM2671N-3.3?
A2: Yes, substitutes must have the same package/case (8-DIP (0.300", 7.62mm)) and mounting type (Through Hole) for proper form-fit-function replacement.

Q3: How do compliance differences influence part selection?
A3: LM2671N-3.3/NOPB is ROHS3 compliant. LM2671N-3.3 is non-compliant. For applications requiring RoHS certification, LM2671N-3.3/NOPB is preferred.

Q4: Are thermal and environmental ratings considered in substitution?
A4: Operating temperature ratings must be equal; both listed parts specify -40°C ~ 125°C (TJ).

Q5: Can LM2671N-3.3/NOPB be used as a drop-in replacement for LM2671N-3.3 in existing designs?
A5: LM2671N-3.3/NOPB matches all electrical, mechanical, and package/case parameters specified for LM2671N-3.3, supporting direct substitution within the stated criteria.