LM3578AN Equivalent & Substitute Parts

Part Overview

The LM3578AN 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 LM3578AN operates at a fixed switching frequency of 20kHz and is housed in an 8-DIP package suitable for through-hole mounting.

The LM3578AN is classified as obsolete. Locating equivalent substitute parts is necessary for new designs, production continuity, and system upgrades where this legacy component is no longer readily available from primary distribution channels.

Substiute Parts

LM3578AN

Texas InstrumentsIn Stock: 11171LM3578AN Datasheet

Current PartRFQ

LM3578AN/NOPB

Texas InstrumentsIn Stock: 2228LM3578AN/NOPB Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the LM3578AN is determined by strict equivalence across the following critical parameters:

Electrical Equivalence Criteria:

• Identical topology: Buck, Boost, Buck-Boost switching regulator
• Matching output configuration: Positive or Negative
• Equivalent output current rating: 750mA (Switch)
• Matching input voltage range: 2V to 40V
• Identical switching frequency: 20kHz
• Same number of outputs: 1

Mechanical & Package Equivalence Criteria:

• Identical package type: 8-DIP (0.300", 7.62mm)
• Matching mounting type: Through Hole
• Compatible supplier device package: 8-PDIP

Environmental & Compliance Criteria:

• Operating temperature range: 0°C ~ 70°C (TA)
• Moisture sensitivity level: 1 (Unlimited)

Only parts meeting all electrical, mechanical, and environmental parameters are classified as direct substitutes.

Parameter Comparison

Engineering Selection Recommendations

The LM3578AN/NOPB is a direct functional and electrical equivalent to the LM3578AN. Both devices share identical electrical specifications, topology, output configuration, and package form factor. The primary distinction lies in product status and regulatory compliance.

LM3578AN Status: Obsolete product with RoHS non-compliant designation. Inventory availability is limited (11,147 pcs reported), and procurement from primary distribution channels is increasingly constrained.

LM3578AN/NOPB Status: Active product with ROHS3 compliance certification. This variant is the current production equivalent maintained by Texas Instruments. Inventory is available (2,200 pcs reported) through established distribution networks. The "/NOPB" suffix indicates lead-free, halogen-free packaging in compliance with modern environmental standards.

For new designs and production continuity, the LM3578AN/NOPB is the appropriate selection. Both parts are electrically interchangeable with identical pinout, electrical performance, and thermal characteristics. The LM3578AN/NOPB is supplied in Tube packaging, whereas the original LM3578AN packaging specification was not detailed.

Frequently Asked Questions (FAQ)

Q: Are the LM3578AN and LM3578AN/NOPB pin-for-pin compatible?

A: Yes. Both devices are housed in the same 8-DIP (0.300", 7.62mm) package with identical pinout. Direct socket substitution is possible without circuit board modifications.

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

A: The "/NOPB" suffix designates a lead-free, halogen-free variant compliant with ROHS3 environmental standards. This is the current production version from Texas Instruments.

Q: Can the LM3578AN/NOPB replace the LM3578AN in existing applications?

A: Yes. The LM3578AN/NOPB is electrically and functionally identical to the LM3578AN across all specified parameters: input voltage range (2V–40V), output current (750mA), switching frequency (20kHz), topology (Buck, Boost, Buck-Boost), and operating temperature range (0°C–70°C).

Q: Why is the LM3578AN classified as obsolete?

A: The LM3578AN is an older product variant that has been superseded by the LM3578AN/NOPB. Texas Instruments maintains the LM3578AN/NOPB as the active production equivalent with improved compliance certifications.

Q: Are there differences in thermal performance between these parts?

A: No thermal performance differences are specified in the provided parameters. Both devices operate within the same temperature range (0°C–70°C) and share identical electrical specifications.

Q: What packaging options are available?

A: The LM3578AN/NOPB is supplied in Tube packaging. The original LM3578AN packaging specification was not provided in the technical data.

Q: Is the LM3578AN/NOPB suitable for new product designs?

A: Yes. The LM3578AN/NOPB is the active production part and is the recommended choice for new designs. It provides ROHS3 compliance and is available through standard distribution channels.