LM2575T-012 Equivalent & Substitute Parts

Part Overview

The LM2575T-012 is a buck switching regulator IC manufactured by onsemi, designed for step-down voltage conversion with a fixed 12V output and 1A current capacity. The device operates across a wide input voltage range of 4.75V to 40V and features a TO-220-5 through-hole package suitable for standard PCB assembly. The product is currently obsolete, making identification of compatible substitute parts essential for ongoing design support and production continuity.

Substiute Parts

LM2575T-012

onsemiIn Stock: 791LM2575T-012 Datasheet

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LM2576-12WT

Microchip TechnologyIn Stock: 1114LM2576-12WT Datasheet

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LM2596T-12/NOPB

Texas InstrumentsIn Stock: 1000441LM2596T-12/NOPB Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the LM2575T-012 are qualified based on the following critical parameters that determine functional compatibility:

• Fixed output voltage of 12V
• TO-220-5 package configuration
• Through-hole mounting type
• Buck topology with positive output configuration
• Operating temperature range of -40°C to 125°C
• Input voltage range compatibility (minimum 4V or lower, maximum 40V)

The LM2576-12WT and LM2596T-12/NOPB both meet these core substitution criteria. While these alternatives provide higher output current ratings (3A versus 1A), they maintain electrical and mechanical compatibility with the original design. Both substitute parts are manufactured by active suppliers and comply with current RoHS3 standards, addressing the obsolescence and compliance limitations of the original LM2575T-012.

Parameter Comparison

Engineering Selection Recommendations

Both LM2576-12WT and LM2596T-12/NOPB are suitable substitutes for the obsolete LM2575T-012 based on product status and compliance considerations.

The LM2576-12WT (Microchip Technology) maintains identical switching frequency (52kHz) to the original part, providing the closest electrical behavior match. This part is RoHS3 compliant and actively manufactured, with 1008 units available in inventory.

The LM2596T-12/NOPB (Texas Instruments) operates at a higher switching frequency of 150kHz, which may reduce output filter component size in new designs. This part is also RoHS3 compliant and actively manufactured, with extensive inventory availability (1,000,400 units). The higher switching frequency represents a design trade-off that may affect EMI characteristics and component selection.

Both substitute parts provide higher output current capacity (3A) than the original 1A specification, offering improved thermal margin and design flexibility for applications requiring current headroom.

Frequently Asked Questions (FAQ)

Q: Can the LM2576-12WT or LM2596T-12/NOPB be used as direct replacements for the LM2575T-012?

A: Yes, both parts are functionally compatible substitutes. They maintain the same fixed 12V output voltage, TO-220-5 package configuration, and through-hole mounting type. The primary differences are higher output current ratings (3A versus 1A) and active product status with RoHS3 compliance.

Q: What is the impact of the higher output current rating on circuit design?

A: The 3A output current rating of substitute parts exceeds the original 1A specification. Existing designs operating below 1A require no circuit modifications. The higher rating provides additional thermal margin and allows for future design scaling without component replacement.

Q: Does the switching frequency difference between LM2576-12WT (52kHz) and LM2596T-12/NOPB (150kHz) affect PCB layout?

A: The higher switching frequency of the LM2596T-12/NOPB may reduce the size of output filter inductors and capacitors due to reduced ripple current requirements. Existing PCB layouts designed for 52kHz operation remain functional with either substitute part, though optimization for the higher frequency may improve performance.

Q: Are there package compatibility considerations between TO-220-5 and TO-220-5 Formed Leads?

A: Both package variants use the same TO-220-5 footprint and pin configuration. The "Formed Leads" designation on the LM2596T-12/NOPB indicates pre-formed lead geometry. Standard through-hole PCB layouts accommodate both variants without modification.

Q: What are the RoHS compliance implications of substitution?

A: The original LM2575T-012 is RoHS non-compliant. Both substitute parts (LM2576-12WT and LM2596T-12/NOPB) are RoHS3 compliant, meeting current environmental and regulatory requirements for new production and design updates.