LM3475MFX Buck Regulator Controller Equivalent & Substitute Parts

Part Overview

The LM3475MFX is a buck regulator positive output step-down DC-DC controller IC in SOT-23-5 package manufactured by Texas Instruments. This device functions as a transistor driver for step-down topology applications with a single output phase and 100% maximum duty cycle. The main part is classified as obsolete, making equivalent substitute parts necessary for ongoing design support and procurement continuity.

Substiute Parts

LM3475MFX

Texas InstrumentsIn Stock: 4113LM3475MFX Datasheet

Current PartRFQ

LM3475MF/NOPB

Texas InstrumentsIn Stock: 2395LM3475MF/NOPB Datasheet

Parametric EquivalentRFQ

LM3475MFX/NOPB

Texas InstrumentsIn Stock: 2364LM3475MFX/NOPB Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the LM3475MFX are identified based on parametric equivalence across all critical electrical and mechanical specifications. The substitution logic is based on matching the following key parameters:

• Output type and function (transistor driver, step-down buck controller)
• Output configuration (positive) and topology (buck)
• Single output, single phase architecture
• Supply voltage range (2.7V ~ 10V)
• Maximum duty cycle (100%)
• Control features (enable function)
• Operating temperature range (-40°C ~ 125°C)
• Package type (SOT-23-5 / SC-74A, SOT-753)
• Surface mount mounting type
• Moisture sensitivity level (MSL 1)

All identified substitutes maintain identical electrical performance characteristics and physical package compatibility with the main part.

Parameter Comparison

Engineering Selection Recommendations

The LM3475MFX is obsolete and no longer in active production. Both LM3475MF/NOPB and LM3475MFX/NOPB are active alternatives with identical electrical and mechanical specifications.

LM3475MF/NOPB is available in Cut Tape (CT) and Digi-Reel packaging options, providing flexibility for different procurement volumes and assembly processes.

LM3475MFX/NOPB is available in Tape & Reel (TR) packaging, suitable for high-volume automated assembly operations.

Both substitute parts are ROHS3 compliant, addressing regulatory requirements that the obsolete main part does not meet. Selection between the two substitutes should be based on packaging format requirements and procurement logistics.

Frequently Asked Questions (FAQ)

Q: Can LM3475MF/NOPB and LM3475MFX/NOPB be used interchangeably with LM3475MFX?

A: Yes. All three parts share identical electrical specifications, output characteristics, supply voltage range, duty cycle capability, control features, operating temperature range, and SOT-23-5 package dimensions. They are parametrically equivalent and functionally interchangeable.

Q: What is the difference between LM3475MF/NOPB and LM3475MFX/NOPB?

A: The primary difference is packaging format. LM3475MF/NOPB is supplied in Cut Tape (CT) and Digi-Reel format, while LM3475MFX/NOPB is supplied in Tape & Reel (TR) format. Both parts are electrically identical and ROHS3 compliant.

Q: Why is the main part LM3475MFX classified as obsolete?

A: The LM3475MFX has reached end-of-life status and is no longer manufactured. Active alternatives with identical specifications are available to support ongoing design requirements.

Q: Are the substitute parts RoHS compliant?

A: Yes. Both LM3475MF/NOPB and LM3475MFX/NOPB are ROHS3 compliant, meeting current regulatory requirements. The obsolete main part is RoHS non-compliant.

Q: What packaging options are available for these parts?

A: LM3475MF/NOPB is available in Cut Tape (CT) and Digi-Reel packaging. LM3475MFX/NOPB is available in Tape & Reel (TR) packaging. All use the SOT-23-5 physical package format.

Q: Can these parts be used in new designs?

A: LM3475MF/NOPB and LM3475MFX/NOPB are active parts suitable for new designs. The obsolete LM3475MFX should not be specified for new applications.