LM2576-5.0BU Equivalent & Substitute Parts

Part Overview

The LM2576-5.0BU is a buck switching regulator IC from Microchip Technology designed for positive fixed 5V output at 3A maximum current. This device operates across a 4V to 40V input range with a 52kHz switching frequency and is housed in a TO-263-6 D2PAK package. The part is currently obsolete, making equivalent substitutes necessary for new designs and production continuity.

Substiute Parts

LM2576-5.0BU

Microchip TechnologyIn Stock: 2381LM2576-5.0BU Datasheet

Current PartRFQ

LM2576-5.0WU

Microchip TechnologyIn Stock: 5000271LM2576-5.0WU Datasheet

DirectRFQ

LM2575S-5.0/NOPB

Texas InstrumentsIn Stock: 2230LM2575S-5.0/NOPB Datasheet

MFR RecommendedRFQ

LM2575SX-5.0/NOPB

Texas InstrumentsIn Stock: 15882LM2575SX-5.0/NOPB Datasheet

MFR RecommendedRFQ

LM2591HVS-5.0/NOPB

Texas InstrumentsIn Stock: 5000161LM2591HVS-5.0/NOPB Datasheet

MFR RecommendedRFQ

LM2591HVSX-5.0/NOPB

Texas InstrumentsIn Stock: 2836LM2591HVSX-5.0/NOPB Datasheet

MFR RecommendedRFQ

TL2575-05IKTTR

Texas InstrumentsIn Stock: 21640TL2575-05IKTTR Datasheet

MFR RecommendedRFQ

TL2575-05IKTTRG3

Texas InstrumentsIn Stock: 5442TL2575-05IKTTRG3 Datasheet

MFR RecommendedRFQ

TL2575HV-05IKTTR

Texas InstrumentsIn Stock: 1320TL2575HV-05IKTTR Datasheet

MFR RecommendedRFQ

TL2575HV-05QKTTRQ1

Texas InstrumentsIn Stock: 2688TL2575HV-05QKTTRQ1 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the LM2576-5.0BU is determined by strict alignment of electrical and mechanical parameters. The critical substitution criteria are:

• Fixed 5V output voltage
• TO-263-6 D2PAK package compatibility
• Operating temperature range of -40°C to 125°C
• Buck topology with no synchronous rectifier
• Input voltage range support (minimum 4V, maximum 40V or higher)
• Switching frequency at or near 52kHz

Substitutes are grouped into two categories: direct replacements from Microchip Technology (same base series LM2576) and manufacturer-recommended alternatives from Texas Instruments (LM2575, LM2591, and TL2575 series). All substitutes maintain identical package footprints and pinouts, ensuring mechanical and electrical compatibility.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute: LM2576-5.0WU

The LM2576-5.0WU from Microchip Technology is the direct functional equivalent. It maintains identical electrical specifications (3A output current, 4V to 40V input range, 52kHz switching frequency) and package configuration. This part is active in production and ROHS3 compliant, addressing the obsolescence and compliance limitations of the original LM2576-5.0BU.

Alternative Substitutes (Current-Limited Applications)

For applications where 1A output current is acceptable, Texas Instruments offers multiple active alternatives:

• LM2575S-5.0/NOPB and LM2575SX-5.0/NOPB: Maintain 52kHz switching frequency and 4V to 40V input range. Available in tube and cut tape packaging respectively.

• TL2575-05IKTTR and TL2575-05IKTTRG3: Operate at 52kHz with 4.75V to 40V input range. The TL2575-05IKTTRG3 variant includes automotive qualification (AEC-Q100).

• TL2575HV-05IKTTR and TL2575HV-05QKTTRQ1: Extended input voltage range (4.75V to 60V) at 52kHz. The TL2575HV-05QKTTRQ1 includes automotive qualification.

Higher Input Voltage Applications

• LM2591HVS-5.0/NOPB and LM2591HVSX-5.0/NOPB: Support extended input range (4.5V to 60V) with higher switching frequency (150kHz). These are suitable for applications requiring higher input voltage tolerance.

All substitutes are ROHS3 compliant and maintain the TO-263-6 D2PAK package footprint. Selection depends on output current requirements, input voltage range, and switching frequency tolerance for your specific application.

Frequently Asked Questions (FAQ)

Q: Can I use a 1A-rated substitute in place of the 3A LM2576-5.0BU?

A: Only if your application's actual output current requirement does not exceed 1A. The 1A-rated alternatives (LM2575 and LM2591 series) are electrically compatible but have lower current capacity. Exceeding the rated current will cause thermal stress and potential device failure.

Q: What is the difference between LM2575 and TL2575 series?

A: Both are buck regulators with identical 5V output and 52kHz switching frequency. The TL2575 series offers extended input voltage range options (up to 60V with HV variants) compared to standard LM2575 specifications. Both are active products from Texas Instruments.

Q: Why do some substitutes have different minimum input voltages (4V vs 4.75V)?

A: Different IC designs have varying minimum input voltage specifications. The LM2576-5.0BU and LM2575 series specify 4V minimum, while TL2575 variants specify 4.75V. Ensure your application's minimum input voltage meets the substitute's specification.

Q: Is the LM2591 series a direct replacement?

A: The LM2591 series maintains 5V output and TO-263-6 packaging but operates at 150kHz (versus 52kHz) and supports higher input voltage (up to 60V). It is functionally compatible but has different switching characteristics. Use only if your application tolerates higher switching frequency.

Q: What does ROHS3 compliance mean?

A: ROHS3 compliance indicates the part meets Restriction of Hazardous Substances Directive requirements, restricting lead, cadmium, mercury, and other hazardous materials. The original LM2576-5.0BU is non-compliant; all listed substitutes are ROHS3 compliant.

Q: Are automotive-qualified variants available?

A: Yes. The TL2575HV-05QKTTRQ1 includes AEC-Q100 automotive qualification. This variant is suitable for automotive and high-reliability applications requiring formal qualification documentation.

Q: Does package type affect substitution?

A: All listed substitutes use the TO-263-6 D2PAK package with identical pinout and footprint. Packaging variants (tube, cut tape, tape & reel) affect handling and ordering but not electrical or mechanical compatibility.