LM3477MM Equivalent & Substitute Parts

Part Overview

The LM3477MM is a Buck, Buck-Boost Regulator Positive Output Step-Down DC-DC Controller IC in 8-VSSOP packaging manufactured by Texas Instruments. This device functions as a transistor driver for step-down conversion with positive output configuration and single-phase topology. The main part number LM3477MM is currently listed as Obsolete product status. Identifying equivalent and substitute parts is necessary to ensure design continuity, maintain supply chain flexibility, and support ongoing production requirements for applications utilizing this controller topology.

Substiute Parts

LM3477MM

Texas InstrumentsIn Stock: 2113LM3477MM Datasheet

Current PartRFQ

LM3477MM/NOPB

Texas InstrumentsIn Stock: 5628LM3477MM/NOPB Datasheet

DirectRFQ

LM3477AMM/NOPB

National SemiconductorIn Stock: 7387LM3477AMM/NOPB Datasheet

Parametric EquivalentRFQ

LM3477AMMX/NOPB

National SemiconductorIn Stock: 3344LM3477AMMX/NOPB Datasheet

Parametric EquivalentRFQ

LM3477MMX

Texas InstrumentsIn Stock: 2317LM3477MMX Datasheet

Parametric EquivalentRFQ

LM3477MMX/NOPB

National SemiconductorIn Stock: 4168LM3477MMX/NOPB Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the LM3477MM are classified based on strict electrical and mechanical parameter equivalence. All substitute parts maintain identical specifications across the following critical parameters:

• Voltage - Supply (Vcc/Vdd): 2.97V ~ 35V
• Frequency - Switching: 500kHz
• Duty Cycle (Max): 93%
• Output Type: Transistor Driver
• Function: Step-Down
• Output Configuration: Positive
• Topology: Buck, Buck-Boost
• Number of Outputs: 1
• Output Phases: 1
• Operating Temperature: -40°C ~ 125°C (TJ)
• Package / Case: 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
• Mounting Type: Surface Mount
• Control Features: Enable

Substitute parts differ only in packaging format (Tape & Reel vs. Bulk), product status (Active vs. Obsolete vs. Last Time Buy), and compliance certifications (RoHS status). These differences do not affect electrical or mechanical compatibility in circuit applications.

Parameter Comparison

Engineering Selection Recommendations

For new designs and ongoing production, LM3477MM/NOPB is the primary recommended substitute. This part maintains Active product status with ROHS3 compliance certification, ensuring long-term availability and regulatory alignment. The Tape & Reel packaging format supports automated assembly processes.

LM3477AMM/NOPB and LM3477MMX/NOPB are secondary alternatives with Active product status and higher inventory levels. These National Semiconductor variants provide equivalent electrical performance and mechanical compatibility.

LM3477MMX carries Last Time Buy status, indicating limited future availability. This part should be selected only when existing inventory of primary substitutes is insufficient.

The original LM3477MM (Obsolete status) should not be specified for new designs. Existing designs currently using LM3477MM can transition to any listed substitute without circuit modification, provided the selected part's product status and compliance certifications align with project requirements.

Frequently Asked Questions (FAQ)

Q: Are all listed substitute parts electrically interchangeable with LM3477MM?

A: Yes. All substitute parts maintain identical electrical specifications including supply voltage range (2.97V ~ 35V), switching frequency (500kHz), duty cycle (93%), output type, function, topology, and operating temperature range (-40°C ~ 125°C). They are pin-compatible and functionally equivalent in circuit applications.

Q: What is the difference between LM3477MM and LM3477MM/NOPB?

A: The primary differences are product status and packaging format. LM3477MM is Obsolete with unspecified packaging, while LM3477MM/NOPB is Active with Tape & Reel packaging and ROHS3 compliance. Electrically and mechanically, they are identical.

Q: Can I use National Semiconductor variants (LM3477AMM/NOPB, LM3477AMMX/NOPB, LM3477MMX/NOPB) as direct replacements?

A: Yes. National Semiconductor variants are parametric equivalents with identical electrical and mechanical specifications. They use the same 8-VSSOP package and support the same circuit topologies. Packaging format differs (Bulk vs. Tape & Reel), but this does not affect circuit compatibility.

Q: What does "Last Time Buy" status mean for LM3477MMX?

A: Last Time Buy indicates the manufacturer has announced end-of-life for this part. Existing inventory is available, but no future production is planned. This part should be used only when primary substitutes are unavailable.

Q: Are there RoHS compliance differences between substitutes?

A: Yes. LM3477MM/NOPB and LM3477MMX are ROHS3 compliant. LM3477MM is RoHS non-compliant. National Semiconductor variants (LM3477AMM/NOPB, LM3477AMMX/NOPB, LM3477MMX/NOPB) do not specify RoHS status in provided data. For applications requiring RoHS compliance, select LM3477MM/NOPB or LM3477MMX.

Q: Does packaging format (Tape & Reel vs. Bulk) affect circuit performance?

A: No. Packaging format affects only handling, storage, and assembly processes. Electrical and mechanical performance is identical regardless of packaging format.

Q: Which substitute should I select for a new design?

A: LM3477MM/NOPB is the recommended choice for new designs. It offers Active product status, ROHS3 compliance, Tape & Reel packaging suitable for automated assembly, and the highest inventory availability (5565 Pcs).