LM3578AMX Equivalent & Substitute Parts

Part Overview

The LM3578AMX is a Buck, Boost, Buck-Boost Switching Regulator IC manufactured by Texas Instruments, designed for multi-configuration power management applications. This device supports positive or negative output configurations with a single output delivering 750mA switch current across an input voltage range of 2V to 40V. The LM3578AMX operates at a fixed switching frequency of 20kHz and is housed in an 8-SOIC surface mount package.

The LM3578AMX carries a Last Time Buy product status, indicating limited availability. Identifying equivalent substitute parts ensures design continuity and supply chain reliability for applications requiring this regulator topology.

Substiute Parts

LM3578AMX

Texas InstrumentsIn Stock: 2193LM3578AMX Datasheet

Current PartRFQ

LM3578AMX/NOPB

Texas InstrumentsIn Stock: 26024LM3578AMX/NOPB Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LM3578AMX is determined by strict equivalence across the following critical parameters:

• Topology & Function: Buck, Boost, Buck-Boost switching regulator with Step-Up, Step-Down, Step-Up/Step-Down capability
• Output Configuration: Positive or Negative single output
• Electrical Specifications: 750mA switch current, 2V to 40V input voltage range, 20kHz switching frequency
• Package: 8-SOIC surface mount form factor with identical 0.154" (3.90mm) width
• Compliance: ROHS3 compliance and MSL Level 1 rating
• Base Product Number: LM3578 series designation

The LM3578AMX/NOPB qualifies as a direct equivalent substitute based on identical electrical characteristics, package specifications, and compliance certifications. The primary distinction is product status and packaging format availability.

Parameter Comparison

Engineering Selection Recommendations

The LM3578AMX/NOPB is a direct functional and electrical equivalent to the LM3578AMX. Both devices share identical electrical specifications, package geometry, and compliance certifications. The LM3578AMX/NOPB is recommended for new designs and ongoing production due to its Active product status, ensuring long-term availability and supply chain stability. The LM3578AMX, designated as Last Time Buy, has limited inventory and should be reserved for legacy system maintenance or existing production runs requiring the original part number.

Both variants maintain ROHS3 compliance and MSL Level 1 rating, supporting applications across industrial, consumer, and automotive environments within the specified operating temperature range of 0°C to 70°C.

Frequently Asked Questions (FAQ)

Q: Can the LM3578AMX/NOPB be used as a direct replacement for the LM3578AMX in existing designs?

A: Yes. The LM3578AMX/NOPB is electrically and mechanically identical to the LM3578AMX. Both devices feature the same 8-SOIC package, electrical specifications, and compliance ratings. The primary difference is product status and packaging format availability.

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

A: The "/NOPB" suffix designates "No Plumbum" (lead-free) packaging and indicates the part is supplied in Cut Tape (CT) and Digi-Reel® formats, which are standard distribution methods for active production components.

Q: Are there any thermal or performance differences between these variants?

A: No. Both the LM3578AMX and LM3578AMX/NOPB operate identically across the specified input voltage range (2V to 40V), deliver 750mA switch current, and maintain the same 20kHz switching frequency and 0°C to 70°C operating temperature range.

Q: Why is the LM3578AMX marked as Last Time Buy?

A: Last Time Buy status indicates that Texas Instruments has discontinued or is discontinuing production of this specific part number variant. The LM3578AMX/NOPB remains in active production and is the recommended choice for ongoing applications.

Q: Can these parts be used interchangeably in PCB layouts?

A: Yes. Both devices use the identical 8-SOIC (0.154", 3.90mm Width) surface mount package, ensuring pin-for-pin compatibility and identical PCB footprints.