LM2585S-3.3 Equivalent & Substitute Parts

Part Overview

The LM2585S-3.3 is a boost, flyback, and forward converter switching regulator IC from Texas Instruments' SIMPLE SWITCHER® series. It delivers a fixed 3.3V output at 3A (switch) with an input voltage range of 4V to 40V and operates at a 100kHz switching frequency. The device is housed in a TO-263-6 (D2PAK) surface mount package.

The LM2585S-3.3 carries an Obsolete product status. Identifying equivalent and substitute parts is necessary to ensure design continuity, maintain supply chain reliability, and support ongoing production or maintenance requirements for systems utilizing this regulator.

Substiute Parts

LM2585S-3.3

Texas InstrumentsIn Stock: 1171LM2585S-3.3 Datasheet

Current PartRFQ

LM2585S-3.3/NOPB

Texas InstrumentsIn Stock: 998LM2585S-3.3/NOPB Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the LM2585S-3.3 is determined by strict equivalence across the following critical parameters:

• Fixed output voltage of 3.3V
• Output current capability of 3A (Switch)
• Input voltage range of 4V to 40V
• Switching frequency of 100kHz
• Topology: Boost, Flyback, Forward Converter
• Package: TO-263-6 (D2PAK with 5 Leads + Tab)
• Surface mount configuration
• Single positive output
• Operating temperature range: -40°C to 125°C (TJ)

The LM2585S-3.3/NOPB qualifies as a direct substitute because it maintains identical electrical specifications, package configuration, and functional characteristics. The primary distinction is product status and compliance certification.

Parameter Comparison

Engineering Selection Recommendations

The LM2585S-3.3/NOPB is the direct substitute for the obsolete LM2585S-3.3. Both parts are electrically and mechanically identical across all functional parameters. The LM2585S-3.3/NOPB carries Active product status, ensuring ongoing availability and manufacturer support.

The LM2585S-3.3/NOPB is ROHS3 compliant, whereas the original LM2585S-3.3 is RoHS non-compliant. This compliance difference is significant for applications subject to RoHS regulations. Both parts maintain REACH Unaffected status and identical ECCN and HTSUS classifications.

Selection of the LM2585S-3.3/NOPB is appropriate for new designs, production continuity, and replacement applications where the electrical and thermal specifications of the LM2585S-3.3 are required.

Frequently Asked Questions (FAQ)

Q: Can the LM2585S-3.3/NOPB directly replace the LM2585S-3.3 in existing designs?

A: Yes. The LM2585S-3.3/NOPB is electrically and mechanically identical to the LM2585S-3.3. All electrical parameters, output voltage, current rating, input voltage range, switching frequency, operating temperature range, and package configuration are identical. Pin-for-pin compatibility is maintained.

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

A: The "/NOPB" suffix indicates that the part is supplied without lead (Pb) plating on the leads, consistent with RoHS3 compliance requirements. This is a packaging and compliance designation that does not affect electrical performance or functionality.

Q: Why is the LM2585S-3.3 marked as Obsolete?

A: The LM2585S-3.3 has reached end-of-life status with Texas Instruments. The LM2585S-3.3/NOPB is the active equivalent that maintains full electrical and mechanical compatibility while providing ongoing manufacturer support and compliance with current environmental regulations.

Q: Are there any thermal or performance differences between the two parts?

A: No. Both parts operate at the same switching frequency (100kHz), support the same output current (3A), and maintain identical thermal specifications with an operating temperature range of -40°C to 125°C (TJ).

Q: What is the package configuration for both parts?

A: Both the LM2585S-3.3 and LM2585S-3.3/NOPB use the TO-263-6 surface mount package, also designated as D2PAK (5 Leads + Tab) or TO-263BA. The physical footprint and pin configuration are identical.

Q: Is the LM2585S-3.3/NOPB suitable for applications requiring RoHS compliance?

A: Yes. The LM2585S-3.3/NOPB is ROHS3 compliant, making it suitable for applications and markets with RoHS regulatory requirements. The original LM2585S-3.3 is RoHS non-compliant.