LM2575T-15G Equivalent & Substitute Parts

Part Overview

The LM2575T-15G is a buck switching regulator IC manufactured by onsemi, designed for step-down voltage conversion with a fixed 15V output at 1A capacity. This device operates across an input voltage range of 4.75V to 40V and is housed in a TO-220-5 through-hole package. The LM2575T-15G is classified as obsolete, making identification of compatible substitute parts essential for ongoing design support and production continuity. The primary substitute maintains the same switching topology, package form factor, and electrical performance envelope while offering extended availability.

Substiute Parts

LM2575T-15G

onsemiIn Stock: 1226LM2575T-15G Datasheet

Current PartRFQ

LM2575T-ADJG

onsemiIn Stock: 5000346LM2575T-ADJG Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

The LM2575T-ADJG qualifies as a direct substitute based on the following critical parameters:

• Identical Package: Both devices use TO-220-5 through-hole packaging, ensuring mechanical and thermal compatibility
• Matching Topology: Both employ buck switching regulation at 52kHz switching frequency
• Same Input Voltage Range: 4.75V to 40V input specification is maintained
• Equivalent Output Current: 1A output capacity is preserved
• Common Base Product: Both derive from the LM2575 product family
• Identical Operating Temperature: -40°C to 125°C thermal range is consistent
• Compliance Alignment: Both meet ROHS3, REACH Unaffected, and EAR99 classifications

The primary distinction is output configuration: the LM2575T-15G provides a fixed 15V output, while the LM2575T-ADJG offers adjustable output from 1.23V to 37V. This adjustability allows the LM2575T-ADJG to be configured for 15V operation through external resistor selection, making it functionally equivalent for this application.

Parameter Comparison

Engineering Selection Recommendations

The LM2575T-ADJG is the recommended substitute for the obsolete LM2575T-15G. Selection rationale is based on the following factors:

Product Status: The LM2575T-ADJG maintains active product status with substantial inventory availability (5,000,300 pcs), ensuring long-term supply continuity compared to the obsolete LM2575T-15G.

Regulatory Compliance: Both devices maintain identical ROHS3 compliance and REACH Unaffected status, satisfying environmental and regulatory requirements without modification.

Certification Alignment: Both parts carry identical ECCN (EAR99) and HTSUS (8542.39.0001) classifications, ensuring no change to export or tariff documentation.

Functional Equivalence: The adjustable output capability of the LM2575T-ADJG encompasses the fixed 15V output of the LM2575T-15G through proper external resistor network configuration, maintaining electrical performance within the specified operating envelope.

Frequently Asked Questions (FAQ)

Q: Can the LM2575T-ADJG directly replace the LM2575T-15G without circuit modifications?

A: The LM2575T-ADJG requires external resistor network configuration to establish 15V output. Direct pin-for-pin substitution without resistor adjustment will not produce the required 15V output. Circuit design modifications are necessary to implement the feedback network for fixed 15V operation.

Q: Are the thermal and mechanical characteristics identical between these devices?

A: Yes. Both devices use the TO-220-5 through-hole package with identical pin configuration, thermal dissipation characteristics, and mounting requirements. PCB layout and heatsinking considerations remain unchanged.

Q: What is the switching frequency of both devices?

A: Both the LM2575T-15G and LM2575T-ADJG operate at 52kHz switching frequency, ensuring compatibility with existing filter and compensation component designs.

Q: Do both devices support the same input voltage range?

A: Yes. Both devices accept input voltages from 4.75V to 40V, maintaining identical input protection and regulation characteristics across the specified range.

Q: Is the output current capacity the same for both parts?

A: Yes. Both devices deliver 1A maximum output current with identical thermal and current-limiting characteristics.

Q: What compliance certifications apply to the substitute part?

A: The LM2575T-ADJG maintains ROHS3 compliance, REACH Unaffected status, and EAR99 export classification, identical to the original LM2575T-15G specifications.