LM2578AMX Equivalent & Substitute Parts

Part Overview

The LM2578AMX is a Buck, Boost Switching Regulator IC manufactured by Texas Instruments, designed for positive or negative output configurations with a single output delivering 750mA switch current. This component operates across a wide input voltage range of 2V to 40V with a fixed switching frequency of 20kHz and is housed in an 8-SOIC surface mount package.

The LM2578AMX is classified as obsolete, which necessitates identification of functionally equivalent alternatives for new designs and ongoing production requirements. Active substitute parts maintain identical electrical and mechanical specifications while offering improved availability and compliance status.

Substiute Parts

LM2578AMX

Texas InstrumentsIn Stock: 2154LM2578AMX Datasheet

Current PartRFQ

LM2578AMX/NOPB

Texas InstrumentsIn Stock: 3654LM2578AMX/NOPB Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LM2578AMX is determined by strict equivalence across the following critical parameters:

• Topology & Function: Buck, Boost switching regulator with Step-Up and Step-Down capability
• Output Configuration: Positive or Negative single output
• Electrical Performance: 750mA switch current, 20kHz switching frequency, 2V to 40V input voltage range
• Operating Temperature Range: -40°C to 85°C
• Package Specification: 8-SOIC surface mount package (0.154", 3.90mm Width)
• Synchronous Rectifier: Non-synchronous design

The LM2578AMX/NOPB qualifies as a direct substitute based on complete parameter alignment across all electrical and mechanical specifications. The primary distinction is product status and compliance certification, not functional capability.

Parameter Comparison

Engineering Selection Recommendations

The LM2578AMX/NOPB is the direct functional equivalent of the LM2578AMX. Selection between these parts is determined by application requirements and regulatory compliance:

LM2578AMX/NOPB is the preferred choice for new designs and production applications due to:

• Active product status with ongoing manufacturer support
• ROHS3 compliance certification
• Tape & Reel packaging suitable for automated assembly processes
• Identical electrical and mechanical specifications

LM2578AMX remains available for legacy system maintenance where existing inventory exists, though this part number is classified as obsolete and subject to availability constraints.

Both parts are functionally interchangeable at the circuit level with no design modifications required. PCB layout and schematic implementation remain identical.

Frequently Asked Questions (FAQ)

Q: Can LM2578AMX/NOPB be used as a direct replacement for LM2578AMX in existing designs?

A: Yes. The LM2578AMX/NOPB is electrically and mechanically identical to the LM2578AMX. No circuit modifications, PCB layout changes, or firmware updates are required. Pin configuration, electrical performance, and thermal characteristics are equivalent.

Q: What is the significance of the "/NOPB" suffix in LM2578AMX/NOPB?

A: The "/NOPB" designation indicates "No Plumbum" (lead-free) packaging, reflecting ROHS3 compliance. This affects solder composition and manufacturing processes but does not alter electrical performance or functional capability.

Q: Why is the LM2578AMX classified as obsolete?

A: Obsolete status indicates the manufacturer has discontinued active production and support. The LM2578AMX/NOPB represents the current active equivalent with identical specifications.

Q: Are there packaging differences between LM2578AMX and LM2578AMX/NOPB?

A: Both parts use the 8-SOIC surface mount package. The primary packaging difference is distribution format: LM2578AMX is supplied in bulk, while LM2578AMX/NOPB is supplied in Tape & Reel format for automated assembly.

Q: What input voltage range does this regulator support?

A: The LM2578AMX and LM2578AMX/NOPB both support input voltages from 2V to 40V, enabling operation across battery-powered systems, industrial power supplies, and automotive applications.

Q: Is synchronous rectification supported?

A: No. Both the LM2578AMX and LM2578AMX/NOPB use non-synchronous rectification. Applications requiring synchronous rectification require alternative regulator topologies.