LM2576T-15G Equivalent & Substitute Parts

Part Overview

The LM2576T-15G is a buck switching regulator IC from onsemi designed for step-down voltage conversion with a fixed 15V output at 3A maximum current. This device operates across an input voltage range of 7V to 40V and is housed in a TO-220-5 through-hole package. The LM2576T-15G is classified as obsolete, making identification of suitable substitute components essential for ongoing design support and production continuity.

Substiute Parts

LM2576T-15G

onsemiIn Stock: 2724LM2576T-15G Datasheet

Current PartRFQ

LM2576T-ADJG

onsemiIn Stock: 6682LM2576T-ADJG Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LM2576T-15G is determined by the following critical parameters:

• Topology & Function: Buck switching regulator topology with step-down capability
• Package Compatibility: TO-220-5 through-hole package for direct PCB mounting
• Output Current Rating: Minimum 3A output current capability
• Input Voltage Range: Support for 7V to 40V input voltage window
• Switching Frequency: 52kHz operation for consistent electromagnetic compatibility
• Temperature Range: -40°C to 125°C junction temperature rating
• Regulatory Compliance: ROHS3 compliance and REACH unaffected status

The LM2576T-ADJG qualifies as a substitute based on matching all mechanical and electrical parameters. The primary distinction is output voltage configuration: the LM2576T-15G provides a fixed 15V output, while the LM2576T-ADJG offers adjustable output voltage from 1.23V to 37V. This adjustability allows the LM2576T-ADJG to be configured for 15V operation through external resistor networks, making it functionally equivalent for this application.

Parameter Comparison

Engineering Selection Recommendations

The LM2576T-ADJG is the primary substitute for the obsolete LM2576T-15G. Both devices share identical electrical specifications for input voltage range, output current, switching frequency, and thermal operating limits. The LM2576T-ADJG maintains active product status with onsemi, ensuring ongoing availability and manufacturing support.

The key distinction between these parts is output voltage configuration. The LM2576T-15G delivers a factory-fixed 15V output, while the LM2576T-ADJG requires external resistor divider networks to set the output voltage. For applications requiring a 15V fixed output, the LM2576T-ADJG can be configured identically through proper resistor selection on the feedback pin, making it a direct functional replacement.

Both parts are ROHS3 compliant and REACH unaffected, meeting current regulatory requirements. The TO-220-5 package is identical, allowing direct PCB footprint compatibility without layout modifications.

Frequently Asked Questions (FAQ)

Q: Can the LM2576T-ADJG directly replace the LM2576T-15G without circuit modifications?

A: The LM2576T-ADJG requires external resistor networks to set output voltage, whereas the LM2576T-15G has factory-programmed 15V output. Direct pin-for-pin substitution is not possible without adding feedback resistors. However, the LM2576T-ADJG can be configured for 15V operation through standard feedback resistor calculations, making it functionally equivalent with minimal circuit additions.

Q: Are the package dimensions identical between these parts?

A: Both the LM2576T-15G and LM2576T-ADJG use the TO-220-5 through-hole package. PCB footprints are mechanically compatible without modification.

Q: What is the primary reason for substitution?

A: The LM2576T-15G is classified as obsolete. The LM2576T-ADJG maintains active product status with onsemi, ensuring continued availability for new designs and production support.

Q: Do both parts meet the same regulatory compliance standards?

A: Yes. Both the LM2576T-15G and LM2576T-ADJG are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements.

Q: Are the electrical performance characteristics identical?

A: Yes. Both parts operate at 52kHz switching frequency, support 7V to 40V input voltage range, deliver 3A maximum output current, and operate across -40°C to 125°C junction temperature range.