LM2576-3.3WT Equivalent & Substitute Parts

Part Overview

The LM2576-3.3WT is an active buck switching regulator IC manufactured by Microchip Technology, designed for step-down voltage conversion with a fixed 3.3V output and 3A current capacity. This TO-220-5 through-hole component operates across a wide input voltage range of 4V to 40V and maintains a junction temperature range of -40°C to 125°C. The part is ROHS3 compliant and carries unlimited moisture sensitivity rating (MSL 1). Finding equivalent substitute parts may be necessary due to supply chain constraints, inventory availability, or specific application requirements while maintaining electrical and mechanical compatibility.

Substiute Parts

LM2576-3.3WT

Microchip TechnologyIn Stock: 4132LM2576-3.3WT Datasheet

Current PartRFQ

AP1501-33T5L-U

Diodes IncorporatedIn Stock: 1952AP1501-33T5L-U Datasheet

MFR RecommendedRFQ

LM2591HVT-3.3/NOPB

Texas InstrumentsIn Stock: 2169LM2591HVT-3.3/NOPB Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the LM2576-3.3WT are qualified based on the following critical parameters that determine functional compatibility:

• Fixed output voltage of 3.3V
• TO-220-5 package configuration for through-hole mounting
• Buck topology for step-down conversion
• Positive output configuration
• Single output design
• ROHS3 compliance and MSL 1 rating
• Active product status

The substitute parts listed maintain these core electrical and mechanical specifications. However, variations exist in output current capacity, input voltage range, and switching frequency, which are documented in the parameter comparison table below.

Parameter Comparison

Engineering Selection Recommendations

All three parts maintain active product status and ROHS3 compliance, ensuring long-term availability and regulatory alignment for new designs.

AP1501-33T5L-U (Diodes Incorporated) provides equivalent 3A output current capacity and maintains the same fixed 3.3V output voltage with TO-220-5L packaging. This part is suitable for direct substitution in applications requiring the full 3A current specification.

LM2591HVT-3.3/NOPB (Texas Instruments) operates with a higher maximum input voltage of 60V compared to the LM2576-3.3WT's 40V maximum, and features a higher switching frequency of 150kHz. However, this part is rated for 1A output current, which is lower than the main part's 3A specification. This substitute is appropriate only for applications requiring less than 1A output current.

Selection between AP1501-33T5L-U and LM2591HVT-3.3/NOPB depends on the specific current requirements of the target application. For designs requiring 3A output, AP1501-33T5L-U is the appropriate choice. For designs requiring 1A or less, LM2591HVT-3.3/NOPB offers extended input voltage range capability.

Frequently Asked Questions (FAQ)

Q: Can LM2591HVT-3.3/NOPB replace LM2576-3.3WT in all applications?

A: No. While both parts share the same 3.3V fixed output voltage and TO-220-5 package family, the LM2591HVT-3.3/NOPB is rated for 1A maximum output current versus the LM2576-3.3WT's 3A rating. Substitution is valid only for applications requiring 1A or less output current.

Q: What is the difference between TO-220-5 and TO-220-5L packaging?

A: Both are through-hole TO-220 packages with 5 leads. The TO-220-5L variant features formed leads, which may affect PCB layout and mechanical fit. Verify PCB footprint compatibility before substitution.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts carry ROHS3 compliance certification, matching the main part's regulatory status.

Q: What determines whether a part can substitute for the LM2576-3.3WT?

A: The critical substitution criteria are: fixed 3.3V output voltage, TO-220-5 package family, buck topology, positive output configuration, single output design, and ROHS3 compliance. Output current capacity and input voltage range must be verified against specific application requirements.

Q: Can I use AP1501-33T5L-U as a direct replacement?

A: AP1501-33T5L-U maintains the same 3A output current and 3.3V fixed output voltage specifications. The TO-220-5L package is mechanically compatible with TO-220-5 footprints. Verify PCB layout compatibility with formed leads before implementation.