LM2578AM Equivalent & Substitute Parts

Part Overview

The LM2578AM 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 at a 20kHz switching frequency in an 8-SOIC surface mount package.

The LM2578AM carries a Last Time Buy product status, indicating that Texas Instruments has discontinued this part number. Identifying equivalent and substitute parts is necessary to ensure design continuity, maintain supply chain reliability, and support ongoing production requirements for applications utilizing this regulator topology.

Substiute Parts

LM2578AM

Texas InstrumentsIn Stock: 2610LM2578AM Datasheet

Current PartRFQ

LM2578AM/NOPB

National SemiconductorIn Stock: 1219LM2578AM/NOPB Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the LM2578AM is determined by strict alignment across the following critical parameters:

• Topology & Function: Buck, Boost switching regulator with Step-Up and Step-Down capability
• Output Configuration: Positive or Negative output support
• Number of Outputs: Single output
• Input Voltage Range: 2V to 40V minimum and maximum specifications
• Output Current: 750mA switch current capacity
• Switching Frequency: 20kHz operation
• Operating Temperature Range: -40°C to 85°C
• Package: 8-SOIC (0.154", 3.90mm Width) surface mount
• Electrical Compliance: RoHS3 compliance and EAR99 classification

Only parts matching all these parameters across the specified ranges qualify as direct substitutes. The LM2578AM/NOPB, manufactured by National Semiconductor, meets all substitution criteria.

Parameter Comparison

Engineering Selection Recommendations

The LM2578AM/NOPB serves as the direct substitute for the LM2578AM. Both parts share identical electrical specifications, package geometry, and functional characteristics. The primary distinction is product status: the original LM2578AM is designated Last Time Buy, while the LM2578AM/NOPB maintains Active status from National Semiconductor.

For new designs or ongoing production requiring long-term component availability, the LM2578AM/NOPB is the appropriate selection. Both parts comply with RoHS3 requirements and carry EAR99 export classification. The packaging difference (Tube versus Bulk) reflects supplier logistics and does not affect electrical or mechanical compatibility.

Frequently Asked Questions (FAQ)

Q: Can the LM2578AM/NOPB directly replace the LM2578AM in existing designs?

A: Yes. Both parts are electrically and mechanically identical across all specified parameters: input voltage range (2V–40V), output current (750mA), switching frequency (20kHz), operating temperature (-40°C to 85°C), and 8-SOIC package dimensions. No circuit modifications are required.

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

A: The "/NOPB" designation indicates the part is supplied without plumbum (lead-free), consistent with RoHS3 compliance requirements. This does not affect functional compatibility with the original LM2578AM.

Q: Why is the LM2578AM marked as Last Time Buy?

A: Last Time Buy status indicates Texas Instruments has discontinued this part number. The LM2578AM/NOPB from National Semiconductor provides continuity for applications requiring this specific regulator topology and electrical performance.

Q: Are there differences in packaging between the two parts?

A: The LM2578AM is supplied in Tube packaging, while the LM2578AM/NOPB is supplied in Bulk packaging. Both use identical 8-SOIC (0.154", 3.90mm Width) surface mount packages. Packaging format affects order quantities and handling but not component performance or PCB compatibility.

Q: What compliance certifications apply to both parts?

A: Both the LM2578AM and LM2578AM/NOPB comply with RoHS3 standards, carry Moisture Sensitivity Level 1 (Unlimited), and are classified as EAR99 for export purposes. REACH status is Unaffected for both parts.