LM2587T-3.3 Equivalent & Substitute Parts

Part Overview

The LM2587T-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 component operates across a 4V to 40V input range with a 100kHz switching frequency and is housed in a TO-220-5 package with formed leads. The part is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system support and new design implementations.

Substiute Parts

LM2587T-3.3

Texas InstrumentsIn Stock: 2180LM2587T-3.3 Datasheet

Current PartRFQ

LM2587T-3.3/NOPB

National SemiconductorIn Stock: 1326LM2587T-3.3/NOPB Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LM2587T-3.3 is determined by strict equivalence across the following critical parameters:

• Output voltage configuration: Fixed 3.3V positive output
• Output current capability: 5A switch current minimum
• Input voltage range: 4V to 40V
• Switching topology: Boost, flyback, or forward converter capability
• Switching frequency: 100kHz operation
• Package type: TO-220-5 formed leads
• Temperature range: -40°C to 125°C junction temperature
• Synchronous rectifier requirement: Non-synchronous operation

The LM2587T-3.3/NOPB qualifies as a direct substitute based on identical electrical specifications, output configuration, current rating, input voltage range, switching frequency, and package form factor. The primary distinction is product status and packaging format.

Parameter Comparison

Engineering Selection Recommendations

The LM2587T-3.3/NOPB is the direct equivalent substitute for the obsolete LM2587T-3.3. Both components share identical electrical specifications, output voltage configuration, current ratings, input voltage range, switching frequency, and package form factor. The substitute part maintains active product status, ensuring continued availability and support.

The primary consideration for selection is product lifecycle status. The main part (LM2587T-3.3) is classified as obsolete, while the substitute (LM2587T-3.3/NOPB) maintains active status. For new designs or systems requiring long-term component availability, the active substitute part is the appropriate selection. Both parts are RoHS non-compliant and carry identical ECCN and HTSUS classifications.

Frequently Asked Questions (FAQ)

Q: Can the LM2587T-3.3/NOPB be used as a direct replacement for the LM2587T-3.3?

A: Yes. Both parts are electrically and mechanically identical across all specified parameters, including output voltage (3.3V fixed), output current (5A switch), input voltage range (4V to 40V), switching frequency (100kHz), and package type (TO-220-5 formed leads). The substitute part is currently in active production status.

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

A: The "/NOPB" designation indicates "No Plumbum" (lead-free) packaging format. This refers to the packaging material specification rather than the component's RoHS compliance status. Both the main part and substitute maintain identical RoHS non-compliant status.

Q: Are there any differences in thermal or operating characteristics between these parts?

A: No. Both parts operate across the identical temperature range of -40°C to 125°C junction temperature and maintain the same thermal characteristics within the TO-220-5 package.

Q: Why is the main part classified as obsolete?

A: Product obsolescence is determined by manufacturer lifecycle decisions. The LM2587T-3.3 has been discontinued by Texas Instruments. The LM2587T-3.3/NOPB remains in active production and serves as the current equivalent for this switching regulator configuration.

Q: Can these parts be used interchangeably in existing PCB designs?

A: Yes. Both parts use identical TO-220-5 formed lead packages and share the same pin configuration, electrical specifications, and functional characteristics. No PCB modifications are required for substitution.