LM2598S-3.3 Equivalent & Substitute Parts

Part Overview

The LM2598S-3.3 is a buck switching regulator IC from Texas Instruments, part of the SIMPLE SWITCHER® series. It delivers a fixed 3.3V output at 1A from input voltages ranging from 4.5V to 40V, operating at a switching frequency of 150kHz. The device is housed in a TO-263-8 (D2PAK) surface mount package with 7 leads plus tab.

This part is classified as obsolete, making substitute identification critical for ongoing production and maintenance applications. Locating functionally equivalent alternatives ensures design continuity and supply chain reliability.

Substiute Parts

LM2598S-3.3

Texas InstrumentsIn Stock: 2985LM2598S-3.3 Datasheet

Current PartRFQ

LM2598S-3.3/NOPB

National SemiconductorIn Stock: 1295LM2598S-3.3/NOPB Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the LM2598S-3.3 is determined by strict equivalence across the following electrical and mechanical parameters:

• Output voltage: 3.3V fixed
• Output current capability: 1A minimum
• Input voltage range: 4.5V to 40V
• Switching topology: Buck (step-down)
• Switching frequency: 150kHz
• Package: TO-263-8 (D2PAK, 7 Leads + Tab)
• Operating temperature range: -40°C to 125°C

The LM2598S-3.3/NOPB qualifies as a direct substitute, maintaining identical electrical specifications and package configuration while differing only in manufacturer designation and product status.

Parameter Comparison

Engineering Selection Recommendations

The LM2598S-3.3/NOPB from National Semiconductor is a direct functional equivalent to the obsolete LM2598S-3.3 from Texas Instruments. Both devices share identical electrical specifications, switching characteristics, and package configuration.

The primary distinction is product status: the original part is obsolete, while the substitute remains in active production. This status difference makes the LM2598S-3.3/NOPB the appropriate selection for new designs and ongoing supply requirements.

Both parts carry identical ECCN (EAR99) and HTSUS (8542.39.0001) classifications, supporting equivalent regulatory and trade compliance profiles.

Frequently Asked Questions (FAQ)

Q: Can the LM2598S-3.3/NOPB be used as a direct replacement for the LM2598S-3.3?

A: Yes. Both parts deliver identical electrical performance, output voltage, current capability, input voltage range, switching frequency, and operating temperature specifications. The TO-263-8 (D2PAK) package configuration is identical, enabling direct PCB substitution without design modification.

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

A: The "/NOPB" designation indicates lead-free (No Plumbum/No Lead) packaging compliance. This reflects manufacturing and environmental standards but does not alter electrical functionality or pin compatibility.

Q: Why is the original LM2598S-3.3 classified as obsolete?

A: Product obsolescence typically results from manufacturer discontinuation decisions. The active status of the LM2598S-3.3/NOPB substitute ensures continued availability for applications requiring this 3.3V, 1A buck regulator specification.

Q: Are there any thermal or reliability differences between these parts?

A: Both parts operate across the identical temperature range (-40°C to 125°C junction temperature) and share the same thermal characteristics associated with the TO-263-8 package. No performance differentiation exists in thermal behavior or reliability metrics based on provided specifications.

Q: Can this part be used in new designs, or only for legacy system maintenance?

A: The LM2598S-3.3/NOPB is suitable for both new designs and legacy system maintenance. Its active product status and lead-free compliance support current manufacturing standards and supply chain continuity.