LM2575MX-12/NOPB Equivalent & Substitute Parts

Part Overview

The LM2575MX-12/NOPB is a buck switching regulator IC from Texas Instruments, part of the SIMPLE SWITCHER® series. It delivers a fixed 12V output at 1A from an input range of 4V to 40V, operating at 52kHz switching frequency in a 24-SOIC surface mount package. The device is classified as obsolete, making identification of equivalent and substitute parts essential for ongoing design support and procurement continuity.

Substiute Parts

LM2575MX-12/NOPB

Texas InstrumentsIn Stock: 920LM2575MX-12/NOPB Datasheet

Current PartRFQ

LM2575-12YWM

Microchip TechnologyIn Stock: 1212LM2575-12YWM Datasheet

DirectRFQ

LM2574N-12G

onsemiIn Stock: 1379LM2574N-12G Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the LM2575MX-12/NOPB is determined by the following critical parameters:

• Fixed output voltage of 12V
• Output current capability of 1A or greater
• Input voltage range compatibility (4V to 40V minimum)
• Switching frequency of 52kHz
• Surface mount or through-hole packaging options
• Operating temperature range of -40°C to 125°C
• RoHS3 compliance and REACH unaffected status

Two substitute parts meet these criteria with varying trade-offs in package type and current rating.

Parameter Comparison

Engineering Selection Recommendations

LM2575-12YWM (Direct Substitute): This part from Microchip Technology is the primary equivalent for the obsolete LM2575MX-12/NOPB. It maintains identical output voltage (12V), output current (1A), input voltage range (4V to 40V), switching frequency (52kHz), and package format (24-SOIC surface mount). The device is currently in active production status, ensuring long-term availability. Both parts are ROHS3 compliant and REACH unaffected. The LM2575-12YWM carries a Moisture Sensitivity Level (MSL) of 2 (1 Year) compared to the original's MSL of 1 (Unlimited), which may require adjusted handling procedures during storage and assembly.

LM2574N-12G (Alternative Substitute): This onsemi part provides functional equivalence with important trade-offs. It maintains the 12V fixed output, 52kHz switching frequency, and full operating temperature range. However, the output current is reduced to 500mA (half the original 1A rating), and the package changes from 24-SOIC surface mount to 8-DIP through-hole. The input voltage minimum increases slightly to 4.75V. This part is suitable only for applications where the reduced current capacity is acceptable and through-hole mounting is feasible or preferred. The device is in active production status with ROHS3 compliance and REACH unaffected status.

Frequently Asked Questions (FAQ)

Q: Can the LM2575-12YWM directly replace the LM2575MX-12/NOPB without PCB modifications?

A: Yes. Both devices use the 24-SOIC surface mount package with identical pinout and electrical specifications. PCB layout and footprint remain unchanged. Moisture sensitivity handling procedures should be updated to account for the LM2575-12YWM's MSL rating of 2 (1 Year).

Q: What are the limitations of using the LM2574N-12G as a substitute?

A: The LM2574N-12G has two primary limitations: output current is rated at 500mA versus the original 1A, and the package is 8-DIP through-hole instead of 24-SOIC surface mount. Applications requiring full 1A output or surface mount assembly are not suitable for this part. The minimum input voltage also increases from 4V to 4.75V.

Q: Are all three parts RoHS and REACH compliant?

A: Yes. The LM2575MX-12/NOPB, LM2575-12YWM, and LM2574N-12G are all ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements.

Q: Which substitute should be selected for new designs?

A: The LM2575-12YWM is the recommended choice for new designs due to its active production status, identical electrical and package specifications, and direct functional equivalence. The LM2574N-12G should be considered only when through-hole mounting is required and reduced output current (500mA) is acceptable.

Q: What is the impact of the different Moisture Sensitivity Levels?

A: The LM2575MX-12/NOPB has MSL 1 (Unlimited shelf life), while the LM2575-12YWM has MSL 2 (1 Year shelf life). MSL 2 devices require storage in dry conditions and have a one-year limit from the date of manufacture before moisture absorption becomes a concern. Proper handling, baking procedures, and storage in moisture-barrier packaging are necessary.