LM2575D2T-3.3 Equivalent & Substitute Parts

Part Overview

The LM2575D2T-3.3 is a buck switching regulator IC manufactured by onsemi, delivering a fixed 3.3V output at 1A from an input range of 4.75V to 40V. This device is classified as obsolete, making equivalent and substitute parts necessary for new designs and production continuity. The part is housed in a TO-263-6 D2PAK package with 5 leads plus tab, suitable for surface mount applications across industrial and consumer electronics requiring step-down voltage regulation.

Substiute Parts

LM2575D2T-3.3

onsemiIn Stock: 12314LM2575D2T-3.3 Datasheet

Current PartRFQ

TL2575-33IKTTR

Texas InstrumentsIn Stock: 3717TL2575-33IKTTR Datasheet

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LM2575-3.3WU-TR

Microchip TechnologyIn Stock: 1820LM2575-3.3WU-TR Datasheet

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LM2592HVS-3.3/NOPB

Texas InstrumentsIn Stock: 1247LM2592HVS-3.3/NOPB Datasheet

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LM2592HVSX-3.3/NOPB

Texas InstrumentsIn Stock: 1840LM2592HVSX-3.3/NOPB Datasheet

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LM2596S-3.3/NOPB

Texas InstrumentsIn Stock: 2723LM2596S-3.3/NOPB Datasheet

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LM2596SX-3.3/NOPB

Texas InstrumentsIn Stock: 25443LM2596SX-3.3/NOPB Datasheet

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MIC4576-3.3WU

Microchip TechnologyIn Stock: 4001MIC4576-3.3WU Datasheet

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TL2575HV-33IKTTR

Texas InstrumentsIn Stock: 1809TL2575HV-33IKTTR Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution for the LM2575D2T-3.3 is determined by the following critical parameters:

• Output Voltage: Must be fixed at 3.3V
• Package Type: Must be TO-263-6 D2PAK (5 Leads + Tab) for PCB compatibility
• Mounting Type: Surface mount only
• Operating Temperature Range: -40°C to 125°C (TJ) minimum
• Input Voltage Range: Minimum 4.75V to maximum 40V
• Output Current Capability: 1A or higher

Substitute parts are grouped into two categories:

Direct Equivalents (1A Output Current): Parts with identical 1A output current rating, 52kHz switching frequency, and matching electrical specifications. These provide pin-for-pin and functional compatibility.

Higher Current Alternatives (2A to 3A Output Current): Parts with increased output current ratings (2A or 3A) while maintaining the same 3.3V output, TO-263-6 package, and operating temperature range. These are suitable when additional current capacity is beneficial or required.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (1A Applications)

TL2575-33IKTTR (Texas Instruments) is the primary direct equivalent. It matches all electrical specifications of the LM2575D2T-3.3, maintains the same 52kHz switching frequency, and is actively manufactured with ROHS3 compliance. This part is recommended for designs requiring no circuit modifications.

LM2575-3.3WU-TR (Microchip Technology) provides an alternative direct equivalent with identical output current and switching frequency. The minimum input voltage is 4V instead of 4.75V, offering slightly broader input range compatibility. This part is actively supported and ROHS3 compliant.

TL2575HV-33IKTTR (Texas Instruments) is suitable when higher input voltage tolerance is required. It accepts input voltages up to 60V compared to the original 40V maximum, while maintaining all other specifications. This part is actively manufactured and ROHS3 compliant.

For Higher Current Applications (2A to 3A)

LM2592HVS-3.3/NOPB and LM2592HVSX-3.3/NOPB (Texas Instruments) provide 2A output current with extended input voltage range (4.5V to 60V) and higher switching frequency (150kHz). These are suitable when additional current capacity is needed without circuit redesign, as they share the same TO-263-6 package.

LM2596S-3.3/NOPB and LM2596SX-3.3/NOPB (Texas Instruments) deliver 3A output current with 150kHz switching frequency. These are recommended for applications requiring maximum current capacity within the same package footprint. Input voltage range is 4.5V to 40V.

MIC4576-3.3WU (Microchip Technology) offers 3A output current with the highest switching frequency (200kHz) among substitutes. Operating temperature range is -40°C to 85°C, which is narrower than the original part. This part is suitable for applications where the reduced temperature range is acceptable and higher switching frequency is beneficial.

All substitute parts listed are actively manufactured and ROHS3 compliant, addressing the obsolescence of the original LM2575D2T-3.3.

Frequently Asked Questions (FAQ)

Q: Can I use a 2A or 3A rated part as a direct replacement for the 1A LM2575D2T-3.3?

A: Yes. Higher current-rated parts (LM2592 series at 2A, LM2596 series at 3A, MIC4576 at 3A) are electrically compatible substitutes. They share the same TO-263-6 package, 3.3V fixed output, and operating temperature range. The higher current rating does not affect circuit operation when the application requires only 1A. No circuit modifications are necessary.

Q: What is the difference between TL2575-33IKTTR and TL2575HV-33IKTTR?

A: Both are 1A buck regulators with 3.3V output and 52kHz switching frequency from Texas Instruments. The primary difference is maximum input voltage: TL2575-33IKTTR accepts up to 40V, while TL2575HV-33IKTTR accepts up to 60V. Select TL2575HV-33IKTTR if your application requires input voltages above 40V.

Q: Are there package compatibility concerns when substituting these parts?

A: No. All substitute parts listed use the TO-263-6 D2PAK package with 5 leads plus tab. Pin assignments and PCB footprints are identical, ensuring direct board-level compatibility without layout modifications.

Q: Why do some substitutes have higher switching frequencies (150kHz or 200kHz) compared to the original 52kHz?

A: Higher switching frequencies reduce the size of external filter components (inductors and capacitors) required for the regulator circuit. This is a design advantage but does not affect compatibility. Existing circuit designs using 52kHz components will function correctly with higher-frequency parts; however, component optimization may be possible.

Q: Which substitute should I choose for new designs?

A: For new designs requiring 1A output, TL2575-33IKTTR or LM2575-3.3WU-TR are recommended as they are actively manufactured, ROHS3 compliant, and provide direct electrical equivalence. For applications where additional current capacity is beneficial, LM2596SX-3.3/NOPB offers 3A output with active support and compliance.

Q: Is the MIC4576-3.3WU suitable for all temperature ranges?

A: The MIC4576-3.3WU operates from -40°C to 85°C (TA), which is narrower than the original part's -40°C to 125°C (TJ) range. Use this part only if your application does not require operation above 85°C.

Q: What is the difference between cut tape and tube packaging options?

A: Cut tape (CT) and Digi-Reel packaging are used for automated assembly lines, while tube packaging is used for manual handling or lower-volume applications. Electrical specifications are identical; packaging choice depends on manufacturing process requirements.