LM2576T-3.3G Equivalent & Substitute Parts

Part Overview

The LM2576T-3.3G 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 new designs and ongoing production support.

Key Parameters

Parameter	Value
Manufacturer Part Number	LM2576T-3.3G
Manufacturer	onsemi
Function	Step-Down (Buck)
Output Voltage	3.3V Fixed
Output Current	3A
Input Voltage Range	7V to 40V
Switching Frequency	52kHz
Package	TO-220-5
Operating Temperature	-40°C to 125°C (TJ)
RoHS Status	ROHS3 Compliant
Product Status	Obsolete

Substitute Part Grouping Explanation

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

Output voltage specification (3.3V fixed)
Output current capability (minimum 3A)
Input voltage range compatibility (7V to 40V minimum)
Package type (TO-220-5 through-hole)
Topology (buck switching regulator)
Operating temperature range (-40°C to 125°C)

Substitute parts are grouped into two categories:

Manufacturer-Recommended Substitute: LM2576T-ADJG from onsemi provides the same base platform with adjustable output, allowing 3.3V configuration while maintaining identical electrical specifications and package compatibility.

Similar Active Alternatives: Parts from Microchip Technology, Texas Instruments, and Diodes Incorporated that meet or exceed the electrical and thermal requirements while maintaining TO-220-5 package compatibility and active product status.

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Input Voltage (Min-Max)	Switching Frequency	Package	Status
LM2576T-3.3G	onsemi	3.3V Fixed	3A	7V - 40V	52kHz	TO-220-5	Obsolete
LM2576T-ADJG	onsemi	1.23V - 37V Adjustable	3A	7V - 40V	52kHz	TO-220-5	Active
LM2576-3.3WT	Microchip Technology	3.3V Fixed	3A	4V - 40V	52kHz	TO-220-5	Active
LM2596T-3.3/NOPB	Texas Instruments	3.3V Fixed	3A	4.5V - 40V	150kHz	TO-220-5	Active
AP1501-33T5L-U	Diodes Incorporated	3.3V Fixed	3A	Not Specified	Not Specified	TO-220-5L	Active
LM2591HVT-3.3/NOPB	Texas Instruments	3.3V Fixed	1A	4.5V - 60V	150kHz	TO-220-5	Active
LM2592HVT-3.3/NOPB	Texas Instruments	3.3V Fixed	2A	4.5V - 60V	150kHz	TO-220-5	Active
LM2595T-3.3/NOPB	Texas Instruments	3.3V Fixed	1A	4.5V - 40V	150kHz	TO-220-5	Active
LM2575-3.3WT	Microchip Technology	3.3V Fixed	1A	4V - 40V	52kHz	TO-220-5	Active
MIC4575-3.3WT	Microchip Technology	3.3V Fixed	1.7A (Switch)	4V - 24V	200kHz	TO-220-5	Active

Engineering Selection Recommendations

Direct Replacement (Preferred): LM2576-3.3WT from Microchip Technology provides the closest functional equivalent with identical 3.3V fixed output, 3A current rating, 52kHz switching frequency, and TO-220-5 package. This part maintains active product status and ROHS3 compliance.

Manufacturer-Recommended Alternative: LM2576T-ADJG from onsemi offers the same electrical platform as the original part with adjustable output capability. This allows 3.3V configuration through external resistor network while maintaining identical input voltage range, current rating, and package compatibility.

Higher Input Voltage Capability: LM2596T-3.3/NOPB from Texas Instruments provides 3A output current with extended input voltage range (4.5V to 40V) and higher switching frequency (150kHz), suitable for applications requiring reduced component size or improved efficiency.

Current-Limited Alternatives: LM2591HVT-3.3/NOPB (1A) and LM2592HVT-3.3/NOPB (2A) from Texas Instruments are suitable only for applications with reduced current requirements below 3A. These parts offer extended input voltage range up to 60V.

Lower Current Applications: LM2575-3.3WT from Microchip Technology and MIC4575-3.3WT provide 1A and 1.7A output respectively, applicable only to designs with current requirements below 3A.

All recommended substitutes maintain ROHS3 compliance, active product status, and TO-220-5 package compatibility with the original LM2576T-3.3G.

Frequently Asked Questions (FAQ)

Q: Can LM2576T-ADJG replace LM2576T-3.3G directly without circuit modification?

A: LM2576T-ADJG requires external resistor network configuration to set output voltage to 3.3V. While electrically compatible, circuit design modification is necessary. The part is recommended for new designs where adjustable output provides design flexibility.

Q: What is the key difference between LM2576-3.3WT and LM2596T-3.3/NOPB?

A: Both provide 3.3V fixed output at 3A. LM2576-3.3WT operates at 52kHz switching frequency matching the original part, while LM2596T-3.3/NOPB operates at 150kHz. Higher switching frequency reduces inductor and capacitor size but may increase EMI considerations.

Q: Can LM2591HVT-3.3/NOPB be used in place of LM2576T-3.3G?

A: LM2591HVT-3.3/NOPB is rated for 1A maximum output current, insufficient for applications requiring 3A. This part is suitable only for designs with reduced current demands.

Q: Are all substitute parts available in TO-220-5 package?

A: Yes, all listed substitutes are available in TO-220-5 through-hole package. AP1501-33T5L-U uses TO-220-5L variant, which maintains mechanical and electrical compatibility with standard TO-220-5 footprints.

Q: What compliance certifications apply to substitute parts?

A: All substitute parts listed maintain ROHS3 compliance and REACH unaffected status, matching the original LM2576T-3.3G regulatory requirements.

Q: Which substitute offers the best thermal performance?

A: All parts operate across -40°C to 125°C junction temperature range except MIC4575-3.3WT, which operates to 85°C ambient. Thermal performance depends on PCB layout, heatsinking, and switching frequency characteristics rather than part selection alone.

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