LM2575T-12 Equivalent & Substitute Parts

Part Overview

The LM2575T-12 is a buck switching regulator IC from Texas Instruments, part of the SIMPLE SWITCHER® series. It provides a fixed 12V output at 1A from an input range of 4V to 40V, operating at 52kHz switching frequency. The device is packaged in TO-220-5 through-hole configuration and is currently in Last Time Buy status. Finding equivalent and substitute parts is necessary due to product lifecycle transitions and to ensure design flexibility for procurement and inventory management.

Substiute Parts

LM2575T-12

Texas InstrumentsIn Stock: 1555LM2575T-12 Datasheet

Current PartRFQ

LM2575T-12/LF03

National SemiconductorIn Stock: 1449LM2575T-12/LF03 Datasheet

DirectRFQ

LM2575T-12/NOPB

Texas InstrumentsIn Stock: 51860LM2575T-12/NOPB Datasheet

MFR RecommendedRFQ

LM2575T-ADJG

onsemiIn Stock: 5000346LM2575T-ADJG Datasheet

MFR RecommendedRFQ

LM2576T-012G

onsemiIn Stock: 10135LM2576T-012G Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the LM2575T-12 is determined by the following critical parameters: output voltage configuration (fixed 12V), output current capability (1A minimum), input voltage range compatibility (4V to 40V), package type (TO-220-5), and switching frequency (52kHz). Substitute parts are grouped into three categories based on these criteria:

Category 1: Direct Fixed-Output Equivalents (12V, 1A) Parts that maintain identical electrical specifications and packaging. These are interchangeable without circuit modification.

Category 2: Adjustable-Output Alternatives (1.23V to 37V, 1A) Parts with adjustable output voltage capability. These require external resistor network configuration to achieve 12V output but provide design flexibility.

Category 3: Higher-Current Variants (12V, 3A) Parts with increased current rating. These are pin-compatible upgrades suitable for applications requiring higher output current while maintaining 12V fixed output.

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation: LM2575T-12/NOPB This Texas Instruments part is the direct equivalent with Active product status, ensuring long-term availability. It maintains identical electrical and thermal specifications with ROHS3 compliance. Inventory availability (51,832 pcs) supports production requirements. Tube packaging is standard for manufacturing environments.

Secondary Recommendation: LM2575T-12/LF03 National Semiconductor variant with Active status and equivalent specifications. Formed leads provide mechanical advantages in certain assembly processes. Suitable where lead forming is a design requirement.

Alternative for Adjustable Applications: LM2575T-ADJG onsemi adjustable variant maintains 1A output current and identical switching frequency. Requires external resistor network for 12V output configuration. Active product status and high inventory (5,000,300 pcs) support long-term supply. Select this only if adjustable output voltage capability is required for the application.

Not Recommended: LM2576T-012G This part is Obsolete and should not be selected for new designs despite higher current rating (3A). Obsolete status creates supply chain risk and limits future availability.

Frequently Asked Questions (FAQ)

Q: Can LM2575T-12/NOPB directly replace LM2575T-12? A: Yes. Both parts are fixed 12V, 1A buck regulators in TO-220-5 packaging with identical electrical specifications, switching frequency, and operating temperature range. No circuit modification is required.

Q: What is the difference between LM2575T-12 and LM2575T-12/LF03? A: The primary difference is lead formation. LM2575T-12/LF03 features formed leads, which may be preferred in specific assembly processes. Electrical specifications and performance are identical.

Q: Can LM2575T-ADJG be used as a substitute? A: LM2575T-ADJG is functionally compatible but requires external resistor configuration to set output voltage to 12V. It is not a direct pin-for-pin replacement without circuit modification. Use only if adjustable output voltage capability is needed.

Q: Why is LM2576T-012G listed if it is Obsolete? A: LM2576T-012G is documented as a historical substitute reference. Its Obsolete status makes it unsuitable for new designs or long-term production. Do not select this part for procurement.

Q: Are all substitute parts ROHS3 compliant? A: LM2575T-12/NOPB and LM2575T-ADJG are confirmed ROHS3 compliant. LM2575T-12/LF03 compliance status is not specified in available data. Verify compliance documentation with the supplier if regulatory certification is required.

Q: What is the minimum input voltage difference between substitutes? A: LM2575T-12, LM2575T-12/LF03, and LM2575T-12/NOPB operate from 4V minimum input. LM2575T-ADJG requires 4.75V minimum, and LM2576T-012G requires 7V minimum. Select based on your circuit's minimum input voltage requirement.

Q: Can higher-current parts like LM2576T-012G upgrade the 1A design? A: LM2576T-012G provides 3A output capability but is Obsolete. For new designs requiring higher current, consult the LM2576T-012G substitute list or select active alternatives from current product lines.