LM2576-12BU Equivalent & Substitute Parts

Part Overview

The LM2576-12BU is a buck switching regulator IC from Microchip Technology designed for step-down voltage conversion with a fixed 12V output and 3A current capacity. This part operates across a 4V to 40V input range with a 52kHz switching frequency and is housed in a TO-263-6 (D2PAK) surface mount package. The LM2576-12BU is classified as obsolete, making identification of equivalent and substitute parts necessary for ongoing design support and procurement.

Substiute Parts

LM2576-12BU

Microchip TechnologyIn Stock: 1065LM2576-12BU Datasheet

Current PartRFQ

LM2576-12WU

Microchip TechnologyIn Stock: 1000468LM2576-12WU Datasheet

DirectRFQ

AP1501A-12K5G-13

Diodes IncorporatedIn Stock: 1863AP1501A-12K5G-13 Datasheet

MFR RecommendedRFQ

LM2575S-12/NOPB

Texas InstrumentsIn Stock: 1202LM2575S-12/NOPB Datasheet

MFR RecommendedRFQ

LM2575SX-12/NOPB

Texas InstrumentsIn Stock: 4652LM2575SX-12/NOPB 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 of the LM2576-12BU is determined by the following critical parameters: output voltage (12V fixed), package type (TO-263-6 D2PAK), output configuration (positive), topology (buck), and mounting type (surface mount). Substitute parts must maintain electrical compatibility within the specified input voltage range, output voltage, and thermal operating conditions.

The substitute parts are grouped into two categories:

Direct Packaging Equivalent: Parts that maintain identical output current capacity (3A) and packaging specifications, ensuring pin-for-pin compatibility and minimal circuit redesign.

Functional Equivalents with Parameter Variations: Parts that maintain core functionality (12V fixed output, buck topology, TO-263-6 package) but with variations in output current capacity, input voltage range, or switching frequency. These require circuit evaluation but remain compatible with the same package footprint.

Parameter Comparison

Engineering Selection Recommendations

LM2576-12WU is the primary direct substitute for the LM2576-12BU. Both parts are manufactured by Microchip Technology, maintain identical electrical specifications (3A output current, 52kHz switching frequency, 4V to 40V input range), and share the same TO-263-6 package. The LM2576-12WU is active and ROHS3 compliant, addressing the obsolescence and compliance limitations of the original part. This substitution requires no circuit modifications.

AP1501A-12K5G-13 from Diodes Incorporated is a functional equivalent with enhanced output current capacity (5A versus 3A). It maintains the 12V fixed output, TO-263-6 package, and buck topology. The higher switching frequency (150kHz) and minimum input voltage of 4.5V represent minor parameter variations. This part is suitable for applications requiring higher current capacity or improved thermal performance. Operating temperature range is -20°C to 85°C, which is narrower than the original part.

LM2575S-12/NOPB, LM2575SX-12/NOPB, TL2575-12IKTTR, and TL2575HV-12IKTTR are functional equivalents with reduced output current capacity (1A versus 3A). These parts maintain the 12V output, 52kHz switching frequency, and TO-263-6 package. All are active and ROHS3 compliant. The TL2575HV-12IKTTR offers extended maximum input voltage (60V versus 40V), suitable for applications with higher input voltage requirements. These parts are appropriate only for applications with output current requirements of 1A or less.

All substitute parts are active products with current manufacturing support and ROHS3 compliance, eliminating the obsolescence and regulatory concerns of the original LM2576-12BU.

Frequently Asked Questions (FAQ)

Q: Can LM2576-12WU directly replace LM2576-12BU without circuit modifications?

A: Yes. The LM2576-12WU is a direct substitute with identical electrical specifications and package. No circuit modifications are required. The primary difference is product status (active versus obsolete) and RoHS compliance.

Q: What is the key difference between LM2576-12BU and AP1501A-12K5G-13?

A: The AP1501A-12K5G-13 provides higher output current capacity (5A versus 3A) and operates at a higher switching frequency (150kHz versus 52kHz). Both maintain the 12V output and TO-263-6 package. The AP1501A is suitable for applications requiring higher current delivery or improved thermal characteristics. Operating temperature range is narrower (-20°C to 85°C versus -40°C to 125°C).

Q: Can I use LM2575S-12/NOPB as a substitute for LM2576-12BU?

A: The LM2575S-12/NOPB is functionally compatible but with reduced output current capacity (1A versus 3A). Substitution is only appropriate if your application requires 1A or less output current. The part maintains the same 12V output, 52kHz switching frequency, and TO-263-6 package.

Q: What is the advantage of TL2575HV-12IKTTR over other LM2575 variants?

A: The TL2575HV-12IKTTR supports a maximum input voltage of 60V compared to 40V for standard variants. This extended input voltage range makes it suitable for applications with higher input voltage requirements while maintaining the same 12V output and 1A current capacity.

Q: Are all substitute parts RoHS compliant?

A: Yes. All substitute parts listed are ROHS3 compliant. The original LM2576-12BU is RoHS non-compliant, making the substitutes preferable for applications subject to RoHS regulations.

Q: What packaging options are available for these substitutes?

A: All substitute parts use the TO-263-6 (D2PAK) surface mount package with 5 leads plus tab. Packaging formats vary by part number (tube, cut tape, or digi-reel), but the physical package footprint and pinout remain consistent across all listed substitutes.