LM2587S-3.3 Equivalent & Substitute Parts

Part Overview

The LM2587S-3.3 is a boost, flyback, and forward converter switching regulator IC from Texas Instruments, configured for positive fixed 3.3V output at 5A switch current. This SIMPLE SWITCHER® series component operates across a 4V to 40V input range with a 100kHz switching frequency and is housed in a TO-263-6 (D2PAK) surface mount package.

The main part number LM2587S-3.3 carries an obsolete product status. Identifying equivalent substitute parts ensures design continuity and supply chain reliability for applications requiring this specific voltage regulation topology and output configuration.

Substiute Parts

LM2587S-3.3

Texas InstrumentsIn Stock: 2145LM2587S-3.3 Datasheet

Current PartRFQ

LM2587S-3.3/NOPB

National SemiconductorIn Stock: 1005LM2587S-3.3/NOPB Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the LM2587S-3.3 is determined by strict equivalence across the following critical parameters:

• Input voltage range: 4V minimum to 40V maximum
• Fixed output voltage: 3.3V
• Output current capability: 5A at switch
• Switching frequency: 100kHz
• Package configuration: TO-263-6 (D2PAK with 5 leads plus tab)
• Surface mount mounting type
• Supported topologies: Boost, Flyback, Forward Converter
• Operating temperature range: -40°C to 125°C

The substitute part LM2587S-3.3/NOPB maintains identical electrical specifications and mechanical packaging, ensuring direct functional equivalence. The /NOPB suffix indicates lead-free (no lead) and halogen-free compliance, representing a manufacturing variant rather than a functional change.

Parameter Comparison

Engineering Selection Recommendations

The LM2587S-3.3/NOPB is the direct substitute for the obsolete LM2587S-3.3. Both parts share identical electrical performance specifications and mechanical packaging, enabling direct replacement in existing designs.

The primary distinction is product status: LM2587S-3.3/NOPB maintains active availability, whereas the original LM2587S-3.3 is obsolete. The /NOPB designation reflects compliance with lead-free and halogen-free manufacturing standards, representing a modern production variant of the same base product (LM2587).

Selection of LM2587S-3.3/NOPB is appropriate for new designs and production continuity where the LM2587S-3.3 is no longer available. Both parts carry identical ECCN (EAR99) and HTSUS (8542.39.0001) classifications.

Frequently Asked Questions (FAQ)

Q: Can LM2587S-3.3/NOPB directly replace LM2587S-3.3 in existing designs?

A: Yes. Both parts are electrically and mechanically identical. The /NOPB suffix indicates lead-free and halogen-free compliance, not a functional change. Pin configuration, package footprint, and electrical performance remain unchanged.

Q: What does the /NOPB suffix mean?

A: /NOPB indicates "No Lead" and "No Halogen" compliance. This is a manufacturing and environmental compliance designation, not a performance specification. The part functions identically to the non-NOPB variant.

Q: Why is the original LM2587S-3.3 listed as obsolete?

A: Product obsolescence reflects end-of-life status from the manufacturer. LM2587S-3.3/NOPB represents the active production variant and is the recommended source for continued supply.

Q: Are there any package or pinout differences between these parts?

A: No. Both parts use the TO-263-6 (D2PAK with 5 leads plus tab) package. Pinout, footprint, and thermal characteristics are identical.

Q: What input voltage range does this regulator support?

A: The input voltage range is 4V minimum to 40V maximum. Both the main part and substitute maintain this specification.

Q: What is the fixed output voltage?

A: The fixed output voltage is 3.3V at a maximum switch current of 5A for both parts.

Q: What topologies does this IC support?

A: The LM2587S-3.3 and LM2587S-3.3/NOPB support boost, flyback, and forward converter topologies with a 100kHz switching frequency.