LM2575T-12/LB03 Equivalent & Substitute Parts

Part Overview

The LM2575T-12/LB03 is a buck switching regulator IC from Texas Instruments, part of the SIMPLE SWITCHER® series. It delivers a fixed 12V output at 1A from input voltages ranging from 4V to 40V, operating across the industrial temperature range of -40°C to 125°C. The device is packaged in TO-220-5 with formed leads for through-hole mounting.

This part carries a "Not For New Designs" status, indicating it has been superseded. Identifying equivalent and substitute parts is necessary for ongoing production support, legacy system maintenance, and design flexibility when the primary part becomes unavailable.

Substiute Parts

LM2575T-12/LB03

Texas InstrumentsIn Stock: 831LM2575T-12/LB03 Datasheet

Current PartRFQ

LM2575T-12/NOPB

Texas InstrumentsIn Stock: 51860LM2575T-12/NOPB Datasheet

DirectRFQ

LM2575TV-012G

onsemiIn Stock: 1251LM2575TV-012G Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the LM2575T-12/LB03 is determined by strict equivalence across the following critical parameters:

• Output voltage: 12V fixed
• Output current: 1A
• Input voltage range: 4V to 40V minimum, 40V maximum
• Switching frequency: 52kHz
• Package: TO-220-5 through-hole
• Operating temperature range: -40°C to 125°C

Parts meeting these specifications are classified as direct substitutes. Variations in input voltage minimums (e.g., 4.75V vs. 4V) represent tighter input specifications and remain compatible. Product status and compliance certifications are secondary factors that influence selection priority but do not disqualify functional equivalence.

Parameter Comparison

Engineering Selection Recommendations

LM2575T-12/NOPB (Texas Instruments) is the primary substitute. It maintains identical electrical specifications and packaging while offering Active product status and ROHS3 compliance. This part is recommended for new production runs and ongoing designs requiring regulatory compliance.

LM2575TV-012G (onsemi) provides functional equivalence with a marginally higher input voltage minimum of 4.75V versus 4V. This part carries Obsolete status, limiting its suitability for long-term production. It is suitable only for legacy system maintenance where supply is available and input voltage specifications accommodate the 4.75V minimum.

The original LM2575T-12/LB03 is not recommended for new designs due to its "Not For New Designs" designation and RoHS non-compliance status.

Frequently Asked Questions (FAQ)

Q: Can LM2575T-12/NOPB directly replace LM2575T-12/LB03 in existing designs?

A: Yes. Both parts share identical electrical specifications, output voltage, current rating, input voltage range, switching frequency, and TO-220-5 package. No circuit modifications are required.

Q: What is the difference between LM2575T-12/LB03 and LM2575T-12/NOPB?

A: The primary differences are product status and RoHS compliance. LM2575T-12/NOPB is Active and ROHS3 compliant, while LM2575T-12/LB03 is marked "Not For New Designs" and is RoHS non-compliant. Electrical performance is identical.

Q: Is LM2575TV-012G from onsemi a suitable substitute?

A: LM2575TV-012G is functionally equivalent with one constraint: its minimum input voltage is 4.75V instead of 4V. If your application requires operation below 4.75V input, this part is not suitable. The part is also Obsolete, making long-term availability uncertain.

Q: What does "Not For New Designs" mean?

A: This status indicates the manufacturer has superseded the part and does not recommend it for new product development. Existing designs may continue using it, but new designs should transition to active alternatives such as LM2575T-12/NOPB.

Q: Are there any package or pinout differences between these substitutes?

A: No. All three parts use the TO-220-5 through-hole package with identical pinout and formed leads. They are mechanically and electrically interchangeable at the board level.

Q: Why is RoHS compliance important for this selection?

A: RoHS3 compliance ensures the part meets environmental and regulatory requirements for lead-free manufacturing and restricted substance limits. For applications subject to regulatory compliance or customer requirements, ROHS3-compliant parts such as LM2575T-12/NOPB are necessary.