LM2575-3.3WT Equivalent & Substitute Parts

Part Overview

The LM2575-3.3WT is an active buck switching regulator IC manufactured by Microchip Technology, designed for step-down voltage conversion with a fixed 3.3V output. This through-hole TO-220-5 package device delivers 1A continuous output current and operates across a wide input voltage range of 4V to 40V, making it suitable for industrial and consumer power supply applications. The part is ROHS3 compliant and carries unlimited moisture sensitivity rating (MSL 1).

Alternative models may be required due to inventory constraints, design optimization for higher current capacity, or application-specific performance requirements while maintaining the same output voltage and package compatibility.

Substiute Parts

LM2575-3.3WT

Microchip TechnologyIn Stock: 5277LM2575-3.3WT Datasheet

Current PartRFQ

LM2596T-3.3/NOPB

Texas InstrumentsIn Stock: 4142LM2596T-3.3/NOPB Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the LM2575-3.3WT is determined by the following critical parameters:

• Output Voltage: Must be fixed at 3.3V
• Package Type: Must be TO-220-5 to ensure mechanical and electrical compatibility with existing PCB layouts
• Output Configuration: Must be positive polarity, single output
• Topology: Must be buck (step-down) switching regulator
• Input Voltage Range: Minimum 4V, maximum 40V
• Operating Temperature Range: -40°C to 125°C (TJ)
• Compliance: ROHS3 compliant, REACH unaffected

The LM2596T-3.3/NOPB qualifies as a direct substitute based on these parameters. While it offers enhanced current capacity (3A versus 1A) and higher switching frequency (150kHz versus 52kHz), these represent performance improvements rather than deviations from the core substitution criteria. The substitute maintains identical output voltage, package configuration, input voltage range, temperature rating, and regulatory compliance.

Parameter Comparison

Engineering Selection Recommendations

Both the LM2575-3.3WT and LM2596T-3.3/NOPB are active products with full ROHS3 compliance and REACH unaffected status, qualifying them for use in regulated applications. The LM2596T-3.3/NOPB is the manufacturer-recommended substitute and maintains all critical electrical and mechanical parameters required for direct substitution.

Selection between these parts should be based on application current requirements. The LM2575-3.3WT is suitable for applications requiring up to 1A output current, while the LM2596T-3.3/NOPB accommodates applications up to 3A. The higher switching frequency of the LM2596T-3.3/NOPB (150kHz versus 52kHz) may result in reduced output filter component sizes and improved transient response characteristics.

Both devices operate across the same input voltage range (with LM2596T-3.3/NOPB minimum at 4.5V versus 4V for LM2575-3.3WT) and maintain identical temperature ratings and compliance certifications.

Frequently Asked Questions (FAQ)

Q: Can the LM2596T-3.3/NOPB be used as a direct replacement for the LM2575-3.3WT?

A: Yes. Both devices share identical output voltage (3.3V fixed), package configuration (TO-220-5), input voltage range (4V to 40V maximum), operating temperature range (-40°C to 125°C), and regulatory compliance (ROHS3). The LM2596T-3.3/NOPB is the manufacturer-recommended substitute.

Q: What are the differences between these two parts?

A: The primary differences are output current capacity (1A for LM2575-3.3WT versus 3A for LM2596T-3.3/NOPB) and switching frequency (52kHz versus 150kHz). The LM2596T-3.3/NOPB also specifies a minimum input voltage of 4.5V compared to 4V for the LM2575-3.3WT.

Q: Will the LM2596T-3.3/NOPB fit the same PCB layout as the LM2575-3.3WT?

A: Yes. Both devices use the TO-220-5 package with identical pin configuration and mechanical dimensions, ensuring compatibility with existing through-hole PCB designs.

Q: Are there any compliance or certification differences?

A: No. Both parts are ROHS3 compliant, REACH unaffected, and carry the same moisture sensitivity level (MSL 1 - Unlimited). Both maintain active product status.

Q: Which part should I select for a new design?

A: Selection depends on application current requirements. For applications requiring 1A or less, either part is suitable. For applications requiring higher current capacity up to 3A, the LM2596T-3.3/NOPB is the appropriate choice. The higher switching frequency of the LM2596T-3.3/NOPB may also provide design advantages in filter component sizing.