LM2575-3.3BT Equivalent & Substitute Parts

Part Overview

The LM2575-3.3BT is a buck switching regulator IC from Microchip Technology designed for step-down voltage conversion with a fixed 3.3V output and 1A current capacity. This part is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements. The LM2575-3.3BT operates across a 4V to 40V input range with a 52kHz switching frequency and is packaged in TO-220-5 through-hole configuration.

Substiute Parts

LM2575-3.3BT

Microchip TechnologyIn Stock: 875LM2575-3.3BT Datasheet

Current PartRFQ

LM2575-3.3WT

Microchip TechnologyIn Stock: 5277LM2575-3.3WT Datasheet

DirectRFQ

LM2592HVT-3.3/NOPB

Texas InstrumentsIn Stock: 1067LM2592HVT-3.3/NOPB Datasheet

MFR RecommendedRFQ

LM2596T-3.3/NOPB

Texas InstrumentsIn Stock: 4142LM2596T-3.3/NOPB Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the LM2575-3.3BT is determined by the following critical parameters: fixed 3.3V output voltage, TO-220-5 package configuration, through-hole mounting, positive output configuration, buck topology, and operating temperature range of -40°C to 125°C. All substitute parts must maintain these core electrical and mechanical specifications to ensure direct compatibility in existing circuit designs.

The substitute parts are grouped into two categories:

Direct Equivalent (Same Output Current): Parts maintaining the 1A output current specification with identical electrical performance characteristics.

Enhanced Substitutes (Higher Output Current): Parts with increased current capacity (2A or 3A) that provide superior performance while maintaining all other critical parameters, suitable for designs requiring additional headroom or upgraded performance.

Parameter Comparison

Engineering Selection Recommendations

LM2575-3.3WT is the direct equivalent substitute for the LM2575-3.3BT. Both parts are manufactured by Microchip Technology with identical electrical specifications, output current rating, and switching frequency. The LM2575-3.3WT is currently in active production status and is RoHS3 compliant, addressing regulatory requirements that the obsolete LM2575-3.3BT does not meet. This part is the preferred choice for direct replacement in existing designs.

LM2592HVT-3.3/NOPB (Texas Instruments) provides enhanced performance with 2A output current capacity and extended input voltage range up to 60V. The higher switching frequency of 150kHz enables smaller external component sizing. This part is suitable for designs requiring increased current capacity or improved thermal performance while maintaining the same output voltage and package configuration.

LM2596T-3.3/NOPB (Texas Instruments) offers the highest output current capacity at 3A with 150kHz switching frequency. This part is appropriate for applications demanding maximum current delivery or designs where future current scaling is anticipated. All three substitute parts maintain RoHS3 compliance and active product status.

Frequently Asked Questions (FAQ)

Q: Can the LM2575-3.3WT directly replace the LM2575-3.3BT without circuit modifications?

A: Yes. The LM2575-3.3WT maintains identical electrical specifications, output voltage, current rating, switching frequency, and TO-220-5 package configuration. No circuit modifications are required for direct substitution.

Q: What are the differences between the Microchip and Texas Instruments substitute options?

A: The LM2575-3.3WT (Microchip) is a direct equivalent with 1A output current. The LM2592HVT-3.3/NOPB and LM2596T-3.3/NOPB (Texas Instruments) offer higher output current ratings of 2A and 3A respectively, with increased switching frequency (150kHz vs. 52kHz) and extended input voltage range capabilities.

Q: Are all substitute parts compatible with the TO-220-5 through-hole footprint?

A: Yes. All substitute parts use TO-220-5 packaging with through-hole mounting. The Texas Instruments parts feature formed leads, which is a standard manufacturing variation that does not affect PCB footprint compatibility.

Q: What compliance advantages do the substitute parts offer over the LM2575-3.3BT?

A: All substitute parts are RoHS3 compliant and in active production status. The LM2575-3.3BT is RoHS non-compliant and obsolete, making the substitutes necessary for designs requiring regulatory compliance and long-term supply assurance.

Q: Can I use a higher current-rated substitute in a design originally specified for 1A output?

A: Yes. The LM2592HVT-3.3/NOPB (2A) and LM2596T-3.3/NOPB (3A) are backward-compatible substitutes. Higher current capacity does not negatively impact designs specified for lower current requirements. External component selection remains based on the actual circuit current demands.

Q: How does the switching frequency difference affect circuit design?

A: The LM2575-3.3WT operates at 52kHz, matching the original part. The Texas Instruments substitutes operate at 150kHz, enabling smaller external filter components due to the higher frequency. Existing designs using 52kHz components will function with 150kHz parts, though component optimization may be possible.