LM2585T-5.0 Equivalent & Substitute Parts

Part Overview

The LM2585T-5.0 is a boost, flyback, and forward converter switching regulator IC from Texas Instruments, configured for positive fixed 5V output at 3A 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 through-hole package. The part is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing design support and production continuity.

Substiute Parts

LM2585T-5.0

Texas InstrumentsIn Stock: 2469LM2585T-5.0 Datasheet

Current PartRFQ

LM2585T-5.0/NOPB

National SemiconductorIn Stock: 2261LM2585T-5.0/NOPB Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LM2585T-5.0 is determined by strict equivalence across the following critical parameters:

• Output Voltage & Current: Fixed 5V output at 3A switch current
• Input Voltage Range: 4V to 40V operation
• Topology & Function: Boost, flyback, and forward converter capability with step-up/step-down functionality
• Switching Frequency: 100kHz operation
• Package: TO-220-5 through-hole form factor with formed leads
• Thermal Range: -40°C to 125°C junction temperature rating
• Output Configuration: Single positive output

The LM2585T-5.0/NOPB qualifies as a direct substitute based on identical electrical specifications, topology, output characteristics, and package configuration. The primary distinction is product status: the substitute part is active, whereas the original is obsolete.

Parameter Comparison

Engineering Selection Recommendations

The LM2585T-5.0/NOPB is the direct equivalent for the obsolete LM2585T-5.0. Selection between these parts is determined by availability and product lifecycle status:

• LM2585T-5.0: Obsolete status indicates end-of-life designation. Use only when existing inventory is available and no new procurement is required.
• LM2585T-5.0/NOPB: Active product status ensures ongoing availability, manufacturing support, and compliance with current supply chain requirements. This part is the preferred selection for new designs and production continuity.

Both parts share identical electrical specifications, thermal ratings, and package configuration. The /NOPB suffix indicates lead-free (Pb-free) compliance. No functional differences exist between these parts for circuit design purposes.

Frequently Asked Questions (FAQ)

Q: Can the LM2585T-5.0/NOPB directly replace the LM2585T-5.0 in existing designs?

A: Yes. Both parts are electrically and mechanically identical. The LM2585T-5.0/NOPB operates across the same 4V to 40V input range, delivers 5V fixed output at 3A switch current, and uses the same TO-220-5 through-hole package. No circuit modifications are required.

Q: What does the /NOPB suffix indicate?

A: The /NOPB designation indicates lead-free (Pb-free) manufacturing compliance. This affects solder reflow profiles and PCB assembly processes but does not alter electrical performance or pin compatibility.

Q: Why is the original LM2585T-5.0 marked as obsolete?

A: Obsolete status reflects Texas Instruments' end-of-life decision for this part number. The LM2585T-5.0/NOPB remains in active production and is the current equivalent offering.

Q: Are there any compliance differences between these parts?

A: Both parts share identical ECCN (EAR99) and HTSUS (8542.39.0001) classifications. The original LM2585T-5.0 is RoHS non-compliant, while compliance status for the substitute is not specified in the provided data.

Q: What is the switching frequency of these regulators?

A: Both parts operate at 100kHz switching frequency, suitable for boost, flyback, and forward converter topologies across the 4V to 40V input range.

Q: Can these parts be used in step-up and step-down configurations?

A: Yes. Both the LM2585T-5.0 and LM2585T-5.0/NOPB support step-up and step-up/step-down functionality, enabling flexible power conversion topologies within the specified input voltage range.