LM3578AM Equivalent & Substitute Parts

Part Overview

The LM3578AM 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 LM3578AM operates at a fixed switching frequency of 20kHz and is housed in an 8-SOIC surface mount package.

The LM3578AM carries a Last Time Buy product status, indicating limited availability. Identifying equivalent substitute parts ensures design continuity and supply chain reliability for applications currently utilizing this component.

Substiute Parts

LM3578AM

Texas InstrumentsIn Stock: 4460LM3578AM Datasheet

Current PartRFQ

LM3578AM/NOPB

Texas InstrumentsIn Stock: 2409LM3578AM/NOPB Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the LM3578AM is determined by strict equivalence across the following critical parameters:

• Topology & Function: Buck, Boost, Buck-Boost switching regulator capability with Step-Up, Step-Down, Step-Up/Step-Down functionality
• Output Configuration: Positive or Negative output support with single output
• Electrical Specifications: Input voltage range 2V to 40V, output current 750mA (Switch), switching frequency 20kHz
• Package Compatibility: 8-SOIC (0.154", 3.90mm Width) surface mount package
• Compliance & Certifications: ROHS3 Compliant, MSL 1 (Unlimited)

The LM3578AM/NOPB qualifies as a direct manufacturer-recommended substitute, maintaining identical electrical and mechanical specifications while differing only in packaging format and product status.

Parameter Comparison

Engineering Selection Recommendations

The LM3578AM/NOPB is the manufacturer-recommended substitute for the LM3578AM. Both devices are manufactured by Texas Instruments and share identical electrical and mechanical specifications. The primary distinction is product status: the LM3578AM is designated Last Time Buy, while the LM3578AM/NOPB maintains Active status, ensuring continued availability and supply chain support.

The LM3578AM/NOPB is supplied in Tube packaging format, whereas the original part packaging is unspecified. Both variants maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating, confirming suitability for standard manufacturing and storage conditions.

For new designs or applications requiring long-term component availability, the LM3578AM/NOPB is the appropriate selection. For existing designs currently using the LM3578AM, direct substitution with LM3578AM/NOPB is electrically and mechanically compatible without circuit modification.

Frequently Asked Questions (FAQ)

Q: Can the LM3578AM/NOPB be used as a direct replacement for the LM3578AM?

A: Yes. Both devices are identical in electrical and mechanical specifications, including input voltage range (2V to 40V), output current (750mA), switching frequency (20kHz), package type (8-SOIC), and operating temperature range (0°C to 70°C). The LM3578AM/NOPB differs only in product status (Active vs. Last Time Buy) and packaging format (Tube).

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

A: The "/NOPB" suffix designates "No Plumbum" (lead-free) packaging, confirming ROHS3 compliance. This is a standard Texas Instruments designation for lead-free variants.

Q: Are there any compliance or certification differences between these parts?

A: No. Both the LM3578AM and LM3578AM/NOPB maintain identical ROHS3 compliance, MSL 1 (Unlimited) moisture sensitivity rating, REACH Unaffected status, and ECCN EAR99 classification.

Q: What is the significance of "Last Time Buy" status for the LM3578AM?

A: Last Time Buy status indicates that the LM3578AM will no longer be manufactured after a specified date. The LM3578AM/NOPB, with Active status, represents the current production variant and is recommended for new designs and long-term supply assurance.

Q: Are the 8-SOIC packages physically identical?

A: Yes. Both parts use the 8-SOIC (0.154", 3.90mm Width) package, ensuring identical PCB footprint and mounting compatibility.

Q: Can I use either part interchangeably in my circuit design?

A: Yes. The LM3578AM and LM3578AM/NOPB are electrically and mechanically interchangeable. No circuit modifications are required when substituting between these variants.