LM2575S-15 Equivalent & Substitute Parts

Part Overview

The LM2575S-15 is a buck switching regulator IC from Texas Instruments, part of the SIMPLE SWITCHER® series. It delivers a fixed 15V output at 1A from an input range of 4V to 40V, operating at 52kHz switching frequency. The device is housed in a TO-263-6 (D2PAK) surface mount package with 5 leads plus tab.

The LM2575S-15 is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain reliability, and support ongoing production requirements for applications utilizing this regulator topology.

Substiute Parts

LM2575S-15

Texas InstrumentsIn Stock: 1965LM2575S-15 Datasheet

Current PartRFQ

LM2575S-15/NOPB

National SemiconductorIn Stock: 2094LM2575S-15/NOPB Datasheet

DirectRFQ

LM2575D2T-15R4G

onsemiIn Stock: 12493LM2575D2T-15R4G Datasheet

MFR RecommendedRFQ

LM2576D2T-15G

onsemiIn Stock: 70793LM2576D2T-15G Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the LM2575S-15 are qualified based on the following criteria:

Electrical Compatibility: Output voltage (15V fixed), output current capability (minimum 1A), input voltage range (4V to 40V minimum), and switching frequency (52kHz) must match or exceed the original specification.

Mechanical Compatibility: Package type must be TO-263-6 (D2PAK-5) to ensure direct PCB footprint compatibility without layout redesign.

Functional Equivalence: Buck topology with positive fixed output configuration and single output.

Thermal Specifications: Operating temperature range of -40°C to 125°C (TJ) must be maintained.

The substitute parts identified below satisfy these criteria and are available from active product lines or direct manufacturer alternatives.

Parameter Comparison

Engineering Selection Recommendations

LM2575S-15/NOPB (National Semiconductor): Direct electrical and mechanical equivalent with active product status. Identical specifications across all critical parameters. Recommended as the primary substitute for direct replacement applications. Packaging format is bulk.

LM2575D2T-15R4G (onsemi): Functionally equivalent with active product status and ROHS3 compliance. Minimum input voltage is 4.75V compared to 4V for the original part. Suitable for applications where the lower input voltage threshold is not critical. Available in Tape & Reel packaging format.

LM2576D2T-15G (onsemi): Higher current capability (3A versus 1A) with active product status and ROHS3 compliance. Minimum input voltage is 7V, which represents a significant departure from the original 4V specification. This part is suitable only for applications with input voltages of 7V or higher and where the increased current capacity provides design margin or future scalability. Available in Tube packaging format.

Frequently Asked Questions (FAQ)

Q: Can LM2575S-15/NOPB be used as a direct drop-in replacement?

A: Yes. The LM2575S-15/NOPB maintains identical electrical specifications, output voltage, output current, input voltage range, switching frequency, and package type. No circuit modifications are required.

Q: What is the key difference between LM2575D2T-15R4G and the original LM2575S-15?

A: The LM2575D2T-15R4G has a minimum input voltage of 4.75V instead of 4V. If your application operates below 4.75V input, this substitute is not suitable. All other electrical parameters are equivalent.

Q: Why does LM2576D2T-15G have a higher minimum input voltage?

A: The LM2576D2T-15G is a higher current variant (3A output) with a 7V minimum input voltage specification. This reflects the different internal design of the LM2576 series compared to the LM2575 series. Use this part only if your application input voltage is 7V or higher.

Q: Are all substitute parts available in the same package?

A: Yes. All substitute parts use the TO-263-6 (D2PAK-5) package, ensuring PCB footprint compatibility. However, packaging formats differ: LM2575S-15/NOPB is supplied in bulk, LM2575D2T-15R4G in Tape & Reel, and LM2576D2T-15G in Tube.

Q: Which substitute offers the best compliance for new designs?

A: Both LM2575D2T-15R4G and LM2576D2T-15G carry ROHS3 compliance. For applications requiring environmental compliance and active product support, either part is suitable, provided input voltage and current requirements are met.

Q: Can I use LM2576D2T-15G if my application only requires 1A output?

A: Yes. The LM2576D2T-15G can deliver 1A output. The 3A rating represents maximum capability. However, verify that your application input voltage meets the 7V minimum requirement before selection.