LM2576S-3.3 Equivalent & Substitute Parts

Part Overview

The LM2576S-3.3 is a buck switching regulator IC from Texas Instruments, delivering fixed 3.3V output at 3A with input voltage range of 4V to 40V. This component operates at 52kHz switching frequency in a TO-263-6 (D2PAK) surface mount package. The main part is currently listed as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity.

Substiute Parts

LM2576S-3.3

Texas InstrumentsIn Stock: 2294LM2576S-3.3 Datasheet

Current PartRFQ

LM2576S-3.3/NOPB

Texas InstrumentsIn Stock: 1415LM2576S-3.3/NOPB Datasheet

DirectRFQ

LM2575D2T-3.3R4G

onsemiIn Stock: 4705LM2575D2T-3.3R4G Datasheet

MFR RecommendedRFQ

LM2576-3.3WU-TR

Microchip TechnologyIn Stock: 3580LM2576-3.3WU-TR Datasheet

MFR RecommendedRFQ

LM2576D2TR4-3.3G

onsemiIn Stock: 2742LM2576D2TR4-3.3G Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility is determined by the following critical parameters:

• Output voltage specification (3.3V fixed)
• Output current capability (minimum 3A required for direct replacement)
• Input voltage range compatibility (4V to 40V minimum)
• Switching frequency (52kHz)
• Package compatibility (TO-263-6, D2PAK)
• Operating temperature range (-40°C to 125°C)

Parts are grouped into direct equivalents (matching all parameters) and functional alternatives (meeting core electrical requirements with package compatibility).

Parameter Comparison

Engineering Selection Recommendations

Direct Equivalent (Preferred for Replacement): LM2576S-3.3/NOPB from Texas Instruments provides identical electrical specifications to the obsolete LM2576S-3.3, with the advantage of active product status and ROHS3 compliance. This part maintains full pin and functional compatibility with no design modifications required.

Alternative from Microchip Technology: LM2576-3.3WU-TR matches all electrical parameters of the original part and maintains active status with ROHS3 compliance. This option provides supply continuity from an alternative manufacturer while preserving identical performance characteristics.

Alternative from onsemi: LM2576D2TR4-3.3G delivers 3A output current with identical switching frequency and package configuration. The minimum input voltage is specified at 7V (versus 4V for the original), which may require circuit evaluation if lower input voltages are required. This part carries active status and ROHS3 compliance.

Limited Current Alternative: LM2575D2T-3.3R4G from onsemi provides the same package and switching frequency but with reduced output current rating of 1A. This part is suitable only for applications requiring less than 1A output current and should not be used as a direct replacement for 3A designs.

Frequently Asked Questions (FAQ)

Q: Can LM2575D2T-3.3R4G replace LM2576S-3.3 in a 3A application? A: No. The LM2575D2T-3.3R4G is rated for 1A maximum output current, making it unsuitable for designs requiring 3A. Using this part in a 3A circuit will result in thermal stress and potential device failure.

Q: What is the difference between LM2576S-3.3/NOPB and LM2576-3.3WU-TR? A: Both parts deliver identical electrical performance (3A, 3.3V, 52kHz, 4V to 40V input). The primary differences are manufacturer (Texas Instruments versus Microchip Technology) and packaging format (Tube versus Tape & Reel). Selection depends on procurement requirements and supply chain preferences.

Q: Does LM2576D2TR4-3.3G require circuit modifications due to its 7V minimum input voltage? A: Circuit evaluation is required if the original design operates below 7V input. If the application minimum input voltage is 7V or higher, no modifications are necessary. If lower input voltages are required, use LM2576S-3.3/NOPB or LM2576-3.3WU-TR instead.

Q: Are all substitute parts pin-compatible with the original LM2576S-3.3? A: Yes. All listed substitute parts use the TO-263-6 (D2PAK) package with identical pinout, enabling direct PCB replacement without layout modifications.

Q: What is the significance of ROHS3 compliance for these parts? A: ROHS3 compliance indicates conformance to Restriction of Hazardous Substances regulations. The original LM2576S-3.3 is non-compliant, while all active substitute parts are ROHS3 compliant, supporting modern supply chain and environmental requirements.