LM2575SX-15 Equivalent & Substitute Parts

Part Overview

The LM2575SX-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 LM2575SX-15 is classified as obsolete. Equivalent and substitute parts are necessary to maintain design continuity and ensure component availability for new production runs and field replacements.

Substiute Parts

LM2575SX-15

Texas InstrumentsIn Stock: 3932LM2575SX-15 Datasheet

Current PartRFQ

LM2575SX-15/NOPB

Texas InstrumentsIn Stock: 6412LM2575SX-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

Substitution eligibility for the LM2575SX-15 is determined by the following criteria:

Electrical Parameters (Must Match):

• Output voltage: 15V fixed
• Topology: Buck (step-down)
• Switching frequency: 52kHz
• Operating temperature range: -40°C to 125°C
• Output configuration: Positive

Mechanical Parameters (Must Match):

• Package type: TO-263-6 (D2PAK-5)
• Mounting type: Surface mount

Allowable Variations:

• Output current: Equal to or greater than 1A
• Input voltage minimum: Equal to or less than 4V
• Input voltage maximum: Equal to or greater than 40V
• Product status: Active preferred over obsolete
• RoHS compliance: ROHS3 compliant preferred
• Moisture sensitivity level: Equal to or lower MSL rating

Substitute parts are grouped into two categories: direct equivalents (same current rating) and higher-current alternatives (current rating exceeds 1A).

Parameter Comparison

Engineering Selection Recommendations

LM2575SX-15/NOPB (Texas Instruments)

This is the direct equivalent of the LM2575SX-15. It maintains identical electrical specifications and package configuration. The primary advantage is active product status and ROHS3 compliance. This part is the preferred first choice for direct replacement in new designs and production runs.

LM2575D2T-15R4G (onsemi)

This part provides electrical and mechanical equivalence with identical 1A output current and 15V fixed output. It is manufactured by onsemi and carries active product status with ROHS3 compliance. The minimum input voltage is 4.75V (versus 4V for the original), which may affect operation in applications requiring input voltages below 4.75V. MSL rating is superior (1 versus 3). This part is suitable for applications where the higher minimum input voltage does not present a constraint.

LM2576D2T-15G (onsemi)

This part differs in output current capacity (3A versus 1A) and minimum input voltage (7V versus 4V). The higher current rating provides design margin for applications with transient current demands. The elevated minimum input voltage restricts use to applications with input voltages of 7V or higher. This part is suitable only for designs where the 7V minimum input voltage and 3A output current are compatible with system requirements.

Frequently Asked Questions (FAQ)

Q: Can LM2575SX-15/NOPB be used as a direct replacement for LM2575SX-15?

A: Yes. Both parts share identical electrical specifications (15V output, 1A current, 52kHz frequency, -40°C to 125°C operating range) and the same TO-263-6 (D2PAK-5) package. The primary difference is product status (active versus obsolete) and RoHS compliance (ROHS3 versus non-compliant).

Q: What is the difference between LM2575D2T-15R4G and LM2576D2T-15G?

A: The LM2575D2T-15R4G maintains the 1A output current of the original part, while the LM2576D2T-15G provides 3A output current. Additionally, the LM2575D2T-15R4G accepts input voltages as low as 4.75V, whereas the LM2576D2T-15G requires a minimum of 7V input. Both share the same 15V fixed output voltage and 52kHz switching frequency.

Q: Can LM2576D2T-15G be used in applications designed for 1A output?

A: Yes. The LM2576D2T-15G is rated for 3A output current, which exceeds the 1A requirement. However, the minimum input voltage of 7V must be verified against system specifications. If the application requires input voltages below 7V, this part is not suitable.

Q: Are all substitute parts in the same package?

A: Yes. All listed substitute parts use the TO-263-6 (D2PAK-5) surface mount package, ensuring mechanical and thermal compatibility with the original LM2575SX-15 design.

Q: What is the significance of MSL rating differences?

A: MSL (Moisture Sensitivity Level) indicates the maximum time a component can be exposed to moisture before soldering. The original LM2575SX-15 has MSL 3 (168 hours), while LM2575D2T-15R4G and LM2576D2T-15G have MSL 1 (unlimited). Lower MSL ratings provide greater flexibility in storage and handling without requiring baking procedures.

Q: Which substitute part should be selected for new production designs?

A: LM2575SX-15/NOPB is the recommended choice for new designs. It provides direct electrical and mechanical equivalence with active product status and ROHS3 compliance. Selection of alternative parts should be based on specific application constraints regarding input voltage range and output current requirements.