LM2575-12WU-TR Equivalent & Substitute Parts

Part Overview

The LM2575-12WU-TR is a buck switching regulator IC manufactured by Microchip Technology, delivering a fixed 12V output at 1A. This Surface Mount device in TO-263-6 D2PAK packaging is designed for step-down voltage conversion applications with an input range of 4V to 40V and operates across -40°C to 125°C. The part is currently Active in product status and ROHS3 compliant.

Substitute parts become necessary when the LM2575-12WU-TR reaches end-of-life, inventory constraints occur, or design requirements demand alternative electrical characteristics such as higher output current capacity or extended input voltage ranges.

Substiute Parts

LM2575-12WU-TR

Microchip TechnologyIn Stock: 1522LM2575-12WU-TR Datasheet

Current PartRFQ

LM2596S-12/NOPB

Texas InstrumentsIn Stock: 2014LM2596S-12/NOPB Datasheet

MFR RecommendedRFQ

LM2596SX-12/NOPB

Texas InstrumentsIn Stock: 35465LM2596SX-12/NOPB Datasheet

MFR RecommendedRFQ

NCV2575D2T-12R4G

onsemiIn Stock: 5844NCV2575D2T-12R4G Datasheet

MFR RecommendedRFQ

TL2575-12IKTTR

Texas InstrumentsIn Stock: 3027TL2575-12IKTTR Datasheet

MFR RecommendedRFQ

TL2575HV-12IKTTR

Texas InstrumentsIn Stock: 2413TL2575HV-12IKTTR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility is determined by the following critical parameters:

• Output Voltage: Must be fixed at 12V
• Package / Case: Must be TO-263-6, D2PAK (5 Leads + Tab)
• Topology: Must be Buck (Step-Down)
• Output Configuration: Must be Positive
• Mounting Type: Must be Surface Mount
• Operating Temperature Range: Must support -40°C to 125°C (TJ)
• RoHS Compliance: Must be ROHS3 Compliant

Substitute parts are grouped into two categories:

Category A - Direct Current Rating Match (1A Output) Parts with identical 1A output current and 52kHz switching frequency, maintaining pin-for-pin compatibility and thermal characteristics.

Category B - Enhanced Current Rating (3A Output) Parts with higher 3A output current capacity and 150kHz switching frequency, offering improved performance headroom while maintaining package compatibility and voltage specifications.

Parameter Comparison

Engineering Selection Recommendations

Category A Substitutes (1A Output Current)

TL2575-12IKTTR and TL2575HV-12IKTTR from Texas Instruments are direct functional equivalents with identical 1A output current and 52kHz switching frequency. Both are Active products with ROHS3 compliance. The TL2575HV-12IKTTR variant extends the maximum input voltage to 60V, providing additional design margin for applications with higher input voltage transients.

NCV2575D2T-12R4G from onsemi maintains electrical equivalence but carries Obsolete product status, limiting its suitability for new designs despite current inventory availability.

Category B Substitutes (3A Output Current)

LM2596S-12/NOPB and LM2596SX-12/NOPB from Texas Instruments offer 3A output current capacity with 150kHz switching frequency. Both are Active products with ROHS3 compliance. These parts provide enhanced current delivery and are suitable for applications requiring higher power delivery than the original 1A specification. The LM2596SX-12/NOPB variant offers extended inventory availability.

Selection between Category A and Category B depends on application current requirements. Category A maintains identical electrical characteristics for direct replacement. Category B provides performance enhancement for designs requiring higher output current capacity.

Frequently Asked Questions (FAQ)

Q: Can LM2596S-12/NOPB or LM2596SX-12/NOPB be used as direct replacements for LM2575-12WU-TR?

A: Yes, with design considerations. Both LM2596 variants are pin-compatible in TO-263-6 D2PAK packaging and deliver the same 12V fixed output. The primary difference is increased output current capacity (3A vs. 1A) and higher switching frequency (150kHz vs. 52kHz). Applications designed for 1A operation will function correctly with these higher-rated parts. PCB layout and thermal management may require adjustment due to increased switching frequency.

Q: What is the difference between TL2575-12IKTTR and TL2575HV-12IKTTR?

A: Both are Texas Instruments equivalents with identical 1A output current and 52kHz switching frequency. The TL2575HV-12IKTTR variant supports input voltages up to 60V, compared to 40V maximum for the standard TL2575-12IKTTR. Select the HV variant for applications with input voltage sources exceeding 40V.

Q: Why is NCV2575D2T-12R4G marked as Obsolete?

A: NCV2575D2T-12R4G carries Obsolete product status from onsemi. While current inventory exists, this part is no longer in active production. For new designs, select Active status alternatives such as TL2575-12IKTTR or LM2596S-12/NOPB to ensure long-term supply availability.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance, matching the environmental and regulatory requirements of the original LM2575-12WU-TR.

Q: Does switching frequency affect circuit design?

A: Yes. Category B substitutes (LM2596 series) operate at 150kHz compared to 52kHz for the original part and Category A substitutes. Higher switching frequency reduces output filter component size but may require PCB layout optimization to minimize EMI. Existing filter designs must be re-evaluated for frequency response compatibility.

Q: Can I use a 3A-rated part in a 1A application?

A: Yes. Higher-rated parts operate safely at lower current levels. The 3A-rated LM2596 variants will function correctly in applications designed for 1A output current, providing additional performance margin and thermal headroom.