LM3475MF Buck Regulator Controller IC Equivalent & Substitute Parts

Part Overview

The LM3475MF is a buck regulator positive output step-down DC-DC controller IC manufactured by Texas Instruments in SOT-23-5 surface mount packaging. 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 number LM3475MF is currently listed as obsolete, making identification of equivalent and substitute parts essential for ongoing design support and procurement.

Substiute Parts

LM3475MF

Texas InstrumentsIn Stock: 2412LM3475MF Datasheet

Current PartRFQ

LM3475MF/NOPB

Texas InstrumentsIn Stock: 2395LM3475MF/NOPB Datasheet

DirectRFQ

LM3475MFX/NOPB

Texas InstrumentsIn Stock: 2364LM3475MFX/NOPB Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the LM3475MF are identified based on strict electrical and mechanical parameter equivalence. All substitute candidates must maintain identical specifications across the following critical parameters:

• Buck regulator controller topology with positive output configuration
• Single output phase with 100% maximum duty cycle
• Supply voltage range of 2.7V ~ 10V
• Transistor driver output type with enable control feature
• Operating temperature range of -40°C ~ 125°C
• SOT-23-5 surface mount package (SC-74A, SOT-753)
• No synchronous rectifier or clock sync capability

The LM3475 base product number encompasses multiple part variants that differ primarily in packaging format and compliance certifications rather than core electrical functionality.

Parameter Comparison

Engineering Selection Recommendations

Both LM3475MF/NOPB and LM3475MFX/NOPB are direct electrical and mechanical equivalents to the obsolete LM3475MF. The primary distinction between these substitute parts and the main part number is product status and regulatory compliance.

LM3475MF/NOPB and LM3475MFX/NOPB are both listed as active products with ROHS3 compliance, whereas the original LM3475MF is obsolete and RoHS non-compliant. For new designs or ongoing production requiring regulatory compliance with current environmental standards, either active substitute part is appropriate. The choice between LM3475MF/NOPB and LM3475MFX/NOPB depends on packaging format requirements: LM3475MF/NOPB is available in Cut Tape and Digi-Reel formats, while LM3475MFX/NOPB is supplied in Tape & Reel format.

Frequently Asked Questions (FAQ)

Q: Can LM3475MF/NOPB or LM3475MFX/NOPB be used as direct replacements for the obsolete LM3475MF?

A: Yes. Both substitute parts maintain identical electrical and mechanical parameters, including supply voltage range, output configuration, topology, package type, and operating temperature range. The substitutes are functionally equivalent for all circuit applications.

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

A: The primary difference is packaging format. LM3475MF/NOPB is available in Cut Tape and Digi-Reel formats, while LM3475MFX/NOPB is supplied in Tape & Reel format. Electrical specifications are identical.

Q: Why is the original LM3475MF listed as obsolete?

A: The LM3475MF is marked as obsolete in the product lifecycle. Active equivalents (LM3475MF/NOPB and LM3475MFX/NOPB) are available from Texas Instruments for continued design support and procurement.

Q: Are there RoHS compliance differences between the substitute parts and the original?

A: Yes. The original LM3475MF is RoHS non-compliant, while both LM3475MF/NOPB and LM3475MFX/NOPB are ROHS3 compliant. For applications requiring environmental regulatory compliance, the active substitutes are the appropriate choice.

Q: Does the SOT-23-5 package remain the same across all three part numbers?

A: Yes. All three part numbers use the same SOT-23-5 surface mount package (SC-74A, SOT-753 case designation). No PCB layout modifications are required when substituting between these parts.

Q: What does the "/NOPB" suffix indicate?

A: The "/NOPB" suffix indicates that the part is supplied without lead (Pb), consistent with RoHS3 compliance requirements.