LM2598T-3.3 Equivalent & Substitute Parts

Part Overview

The LM2598T-3.3 is a buck switching regulator IC from Texas Instruments' SIMPLE SWITCHER® series, designed for step-down voltage conversion with a fixed 3.3V output and 1A current capacity. This component operates across a wide input voltage range of 4.5V to 40V and is housed in a TO-220-7 through-hole package. The main part number is currently listed as obsolete, making identification of active equivalent parts essential for ongoing design support and procurement.

Substiute Parts

LM2598T-3.3

Texas InstrumentsIn Stock: 2219LM2598T-3.3 Datasheet

Current PartRFQ

LM2598T-3.3/NOPB

Texas InstrumentsIn Stock: 975LM2598T-3.3/NOPB Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the LM2598T-3.3 is determined by strict equivalence across the following critical parameters:

• Output voltage specification (3.3V fixed)
• Output current rating (1A minimum)
• Input voltage operating range (4.5V to 40V)
• Package and pinout compatibility (TO-220-7 Formed Leads)
• Switching topology (buck converter)
• Switching frequency (150kHz)
• Thermal operating range (-40°C to 125°C)

The LM2598T-3.3/NOPB qualifies as a direct substitute based on identical electrical specifications and package configuration. The primary distinction is product status and compliance certification.

Parameter Comparison

Engineering Selection Recommendations

The LM2598T-3.3/NOPB is the direct active equivalent for the obsolete LM2598T-3.3. Both parts share identical electrical and thermal specifications, ensuring functional compatibility in existing designs. The primary advantage of the LM2598T-3.3/NOPB is its active product status and ROHS3 compliance certification, making it the preferred choice for new procurement and designs subject to RoHS regulatory requirements. The "/NOPB" suffix indicates lead-free plating, consistent with modern manufacturing standards. No functional redesign is required when transitioning from the obsolete part to its active equivalent.

Frequently Asked Questions (FAQ)

Q: Can the LM2598T-3.3/NOPB directly replace the LM2598T-3.3 in existing designs?

A: Yes. Both parts are electrically and mechanically identical, with matching output voltage (3.3V), output current (1A), input voltage range (4.5V to 40V), package type (TO-220-7), and thermal specifications (-40°C to 125°C). No circuit modifications are required.

Q: What does the "/NOPB" suffix indicate?

A: The "/NOPB" designation specifies lead-free plating on the component leads, indicating compliance with RoHS3 standards. This is a manufacturing and compliance designation, not a functional difference.

Q: Why is the original LM2598T-3.3 marked as obsolete?

A: Product obsolescence typically reflects manufacturer discontinuation decisions. The active LM2598T-3.3/NOPB variant remains available and provides equivalent functionality with updated compliance certifications.

Q: Are there any package or pinout differences between these parts?

A: No. Both parts use the TO-220-7 Formed Leads package with identical pinout and mechanical dimensions, ensuring direct PCB compatibility.

Q: What compliance certifications differ between the two parts?

A: The LM2598T-3.3/NOPB carries ROHS3 compliance certification, while the original LM2598T-3.3 is RoHS non-compliant. Both maintain REACH Unaffected status and identical ECCN and HTSUS classifications.