LM2576-12BU TR Equivalent & Substitute Parts

Part Overview

The LM2576-12BU TR is a buck switching regulator IC manufactured by Microchip Technology, delivering a fixed 12V output at 3A. This device operates as a positive step-down converter with a switching frequency of 52kHz and supports input voltages from 4V to 40V. The part is housed in a TO-263-6 D2PAK package with 5 leads plus tab.

The LM2576-12BU TR is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain reliability, and support ongoing production requirements for applications utilizing this buck regulator topology.

Substiute Parts

LM2576-12BU TR

Microchip TechnologyIn Stock: 930LM2576-12BU TR Datasheet

Current PartRFQ

LM2576-12WU-TR

Microchip TechnologyIn Stock: 2539LM2576-12WU-TR 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

Substitute parts for the LM2576-12BU TR are evaluated based on the following critical parameters:

• Output Voltage: Must be fixed at 12V
• Package Type: Must be TO-263-6 D2PAK (5 Leads + Tab)
• Topology: Must be buck (step-down) switching regulator
• Output Configuration: Must be positive
• Mounting Type: Must be surface mount
• Number of Outputs: Must be single output

Substitutes are grouped into two categories:

Direct Equivalents: Parts with identical or compatible output current ratings (3A) and input voltage ranges, maintaining full functional compatibility.

Functional Alternatives: Parts with different output current ratings or input voltage specifications that may require circuit evaluation but share the same core topology, package, and output voltage.

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation: LM2576-12WU-TR

The LM2576-12WU-TR is the direct successor to the LM2576-12BU TR. Both parts are manufactured by Microchip Technology and share identical electrical specifications: 3A output current, 4V to 40V input range, 52kHz switching frequency, and -40°C to 125°C operating temperature range. The LM2576-12WU-TR is in active production status and is ROHS3 compliant, addressing regulatory requirements that the obsolete LM2576-12BU TR does not meet. This part provides seamless design compatibility with no circuit modifications required.

Secondary Recommendation: AP1501A-12K5G-13

The AP1501A-12K5G-13 from Diodes Incorporated is an active, ROHS3-compliant alternative with the same TO-263-6 D2PAK package and 12V fixed output. This part delivers 5A output current, exceeding the 3A specification of the original part, and operates across the same 4.5V to 40V input range. The switching frequency is 150kHz, higher than the original 52kHz. The operating temperature range is -20°C to 85°C, which is narrower than the original -40°C to 125°C specification. This part is suitable for applications where higher output current capacity is beneficial and the reduced temperature range is acceptable.

Alternative Options: LM2575S-12/NOPB, LM2575SX-12/NOPB, TL2575-12IKTTR, TL2575HV-12IKTTR

These Texas Instruments parts are active and ROHS3 compliant but deliver only 1A output current, compared to the 3A rating of the original part. These options are suitable only for applications where the load current requirement does not exceed 1A. The LM2575 series maintains the 52kHz switching frequency and -40°C to 125°C operating temperature range. The TL2575HV-12IKTTR variant supports input voltages up to 60V, providing extended input range capability compared to the standard 40V maximum.

Frequently Asked Questions (FAQ)

Q: Can I directly replace the LM2576-12BU TR with the LM2576-12WU-TR without circuit modifications?

A: Yes. Both parts are manufactured by Microchip Technology and share identical electrical and mechanical specifications. The LM2576-12WU-TR is the active production equivalent and requires no design changes.

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

A: The AP1501A-12K5G-13 provides higher output current (5A versus 3A) and operates at a higher switching frequency (150kHz versus 52kHz). The operating temperature range is narrower (-20°C to 85°C versus -40°C to 125°C). Both share the same TO-263-6 package and 12V output voltage. Circuit evaluation is required to confirm compatibility with the higher switching frequency and reduced temperature range.

Q: Why do the LM2575 series parts have lower output current ratings?

A: The LM2575 series is a different product line within the buck regulator family. These parts are rated for 1A output current, making them unsuitable as direct replacements for the 3A-rated LM2576-12BU TR. They are appropriate only for lower-current applications.

Q: Is the LM2576-12BU TR RoHS compliant?

A: No. The LM2576-12BU TR is classified as RoHS non-compliant. All recommended substitute parts are ROHS3 compliant, meeting current regulatory requirements.

Q: Can I use the TL2575HV-12IKTTR if my application requires input voltages above 40V?

A: The TL2575HV-12IKTTR supports input voltages up to 60V, compared to 40V for most other alternatives. However, this part is rated for only 1A output current. Use this part only if your application requires both the extended input voltage range and can operate with 1A maximum output current.

Q: What packaging options are available for these substitute parts?

A: All substitute parts listed are housed in the TO-263-6 D2PAK package with 5 leads plus tab, maintaining mechanical compatibility with the original LM2576-12BU TR. Packaging variants (Tape & Reel, Cut Tape, Tube) differ by supplier but do not affect electrical or mechanical form factor.