LM2585SX-5.0 Equivalent & Substitute Parts

Part Overview

The LM2585SX-5.0 is a fixed 5V output switching regulator IC from the SIMPLE SWITCHER® series, designed for boost, flyback, and forward converter topologies. This component operates as a positive fixed voltage regulator with a 3A switch current output and supports input voltages from 4V to 40V. The main part number is currently in Last Time Buy status with 1570 pieces in stock. Finding equivalent and substitute parts is necessary due to product lifecycle management and supply chain continuity.

Substiute Parts

LM2585SX-5.0

Texas InstrumentsIn Stock: 1642LM2585SX-5.0 Datasheet

Current PartRFQ

LM2585SX-5.0/NOPB

National SemiconductorIn Stock: 2166LM2585SX-5.0/NOPB Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the LM2585SX-5.0 is determined by strict equivalence across the following critical parameters:

• Fixed output voltage of 5V
• Input voltage range of 4V to 40V
• Output current capability of 3A (Switch)
• Switching frequency of 100kHz
• Operating temperature range of -40°C to 125°C (TJ)
• Package compatibility: TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
• Surface mount mounting type
• Boost, flyback, and forward converter topology support

The substitute part LM2585SX-5.0/NOPB meets all these criteria and is therefore classified as a direct equivalent. The /NOPB suffix indicates lead-free (Pb-free) packaging, which is compliant with modern environmental standards.

Parameter Comparison

Engineering Selection Recommendations

The LM2585SX-5.0/NOPB is a direct functional equivalent to the LM2585SX-5.0. Selection between these parts should be based on the following factors:

• The main part (LM2585SX-5.0) is in Last Time Buy status, indicating limited future availability. The substitute part (LM2585SX-5.0/NOPB) maintains Active product status, ensuring long-term supply continuity.
• Both parts are ROHS3 compliant and meet the same electrical and thermal specifications.
• The /NOPB designation on the substitute part indicates lead-free construction, which aligns with modern environmental and regulatory requirements.
• Inventory availability is higher for the substitute part (2100 pieces versus 1570 pieces), providing better supply security.
• Both parts are packaged identically in TO-263-6 (D2PAK) format with identical pin configurations, enabling direct PCB-level substitution without layout modifications.

Frequently Asked Questions (FAQ)

Q: Can LM2585SX-5.0/NOPB be used as a direct replacement for LM2585SX-5.0?

A: Yes. Both parts share identical electrical specifications, output voltage (5V), input voltage range (4V to 40V), output current (3A), switching frequency (100kHz), operating temperature range (-40°C to 125°C), and package format (TO-263-6, D2PAK). No circuit modifications are required.

Q: What does the /NOPB suffix mean?

A: The /NOPB suffix indicates that the component is manufactured in a lead-free (Pb-free) process. This designation ensures compliance with RoHS directives and modern environmental standards.

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

A: No. Both parts operate within the same temperature range (-40°C to 125°C junction temperature) and share identical thermal characteristics due to matching package types and electrical specifications.

Q: Why is the main part listed as Last Time Buy?

A: Last Time Buy status indicates that the manufacturer has discontinued or is phasing out this specific part number. The substitute part with Active status ensures continued availability for future production needs.

Q: Can these parts be used interchangeably on existing PCBs?

A: Yes. Both parts use the identical TO-263-6 (D2PAK) package with the same pin configuration and lead spacing. No PCB modifications are necessary for substitution.

Q: What is the Moisture Sensitivity Level (MSL) for the substitute part?

A: The MSL specification for the substitute part is not provided in the available technical data. Refer to the manufacturer's datasheet for complete MSL information.