LM2576T-3.3 Equivalent & Substitute Parts

Part Overview

The LM2576T-3.3 is a buck switching regulator IC from onsemi, rated for 3.3V fixed output at 3A maximum current. This device operates across a 7V to 40V input range with a 52kHz switching frequency and is housed in a TO-220-5 through-hole package. The part is currently obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity.

Substiute Parts

LM2576T-3.3

onsemiIn Stock: 1788LM2576T-3.3 Datasheet

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LM2576T-3.3G

onsemiIn Stock: 3270LM2576T-3.3G Datasheet

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LM2575-3.3WT

Microchip TechnologyIn Stock: 5277LM2575-3.3WT Datasheet

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LM2576-3.3WT

Microchip TechnologyIn Stock: 4132LM2576-3.3WT Datasheet

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LM2592HVT-3.3/NOPB

Texas InstrumentsIn Stock: 1067LM2592HVT-3.3/NOPB Datasheet

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LM2595T-3.3/NOPB

Texas InstrumentsIn Stock: 957LM2595T-3.3/NOPB Datasheet

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LM2596T-3.3/NOPB

Texas InstrumentsIn Stock: 4142LM2596T-3.3/NOPB Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution for the LM2576T-3.3 is determined by the following critical parameters:

• Output Voltage: 3.3V fixed output
• Output Current Capability: Minimum 3A
• Input Voltage Range: Minimum 7V to 40V
• Package Type: TO-220-5 through-hole
• Topology: Buck switching regulator
• Switching Frequency: 52kHz or higher acceptable

Substitute parts are grouped into two categories:

Direct Equivalent: LM2576T-3.3G maintains identical electrical specifications and packaging, differing only in packaging format (tube) and RoHS compliance status.

Functional Equivalents: Parts meeting or exceeding the 3A output current requirement, 3.3V fixed output, and compatible input voltage range. These include LM2576-3.3WT (Microchip), LM2596T-3.3/NOPB (Texas Instruments), and LM2592HVT-3.3/NOPB (Texas Instruments).

Reduced Current Alternatives: LM2575-3.3WT and LM2595T-3.3/NOPB are suitable only for applications requiring 1A or less output current.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (3A Output Required)

LM2576-3.3WT (Microchip Technology) is the primary active substitute. It maintains the 52kHz switching frequency and 3A output current of the original part while offering a lower minimum input voltage (4V vs. 7V) and active product status. ROHS3 compliance supports modern supply chain requirements.

LM2596T-3.3/NOPB (Texas Instruments) provides full 3A capability with extended input voltage range (4.5V to 40V) and higher switching frequency (150kHz), reducing output filter component size. Active product status and ROHS3 compliance ensure long-term availability.

For Current-Limited Applications (1A Output)

LM2575-3.3WT (Microchip Technology) and LM2595T-3.3/NOPB (Texas Instruments) are suitable only when application load does not exceed 1A. Both maintain 3.3V fixed output and TO-220-5 packaging with active product status.

For Extended Input Voltage Range (Up to 60V)

LM2592HVT-3.3/NOPB (Texas Instruments) supports input voltages to 60V, exceeding the original 40V maximum. Output current is limited to 2A. This part is appropriate for applications requiring higher input voltage tolerance.

Obsolete Part Consideration

LM2576T-3.3G (onsemi) is electrically identical to the original LM2576T-3.3 but with improved RoHS3 compliance. Both parts are obsolete; active alternatives are preferred for new designs.

Frequently Asked Questions (FAQ)

Q: Can LM2596T-3.3/NOPB directly replace LM2576T-3.3 in existing designs?

A: Yes, for applications requiring 3A output current. The LM2596T-3.3/NOPB maintains identical 3.3V output and 3A current rating in the same TO-220-5 package. The higher switching frequency (150kHz vs. 52kHz) may reduce external component size but requires circuit validation.

Q: What is the minimum input voltage difference between the original and substitutes?

A: The original LM2576T-3.3 requires minimum 7V input. Most active substitutes (LM2576-3.3WT, LM2596T-3.3/NOPB) operate from 4V to 4.5V minimum, providing greater design flexibility for lower-voltage source applications.

Q: Are LM2575-3.3WT and LM2595T-3.3/NOPB suitable for 3A applications?

A: No. Both parts are rated for 1A maximum output current. They are suitable only for applications with load current not exceeding 1A. For 3A requirements, use LM2576-3.3WT or LM2596T-3.3/NOPB.

Q: Does switching frequency affect circuit design?

A: Yes. The original 52kHz and Microchip LM2576-3.3WT operate at 52kHz. Texas Instruments parts (LM2596T-3.3/NOPB, LM2592HVT-3.3/NOPB, LM2595T-3.3/NOPB) operate at 150kHz. Higher frequency reduces output filter inductor and capacitor size but may require PCB layout adjustments for noise management.

Q: Which substitute offers the best long-term availability?

A: LM2576-3.3WT (Microchip Technology) and LM2596T-3.3/NOPB (Texas Instruments) both carry active product status with ROHS3 compliance, ensuring continued manufacturing and supply chain support.

Q: Is the TO-220-5 package identical across all substitutes?

A: Yes. All listed substitutes use TO-220-5 through-hole packaging with identical pin configuration and mechanical dimensions, enabling direct PCB compatibility.