LM2575-12WT Equivalent & Substitute Parts

Part Overview

The LM2575-12WT is an active buck switching regulator IC manufactured by Microchip Technology, designed for step-down voltage conversion applications. It delivers a fixed 12V output at 1A maximum current from input sources ranging from 4V to 40V. The device operates across the industrial temperature range of -40°C to 125°C and is packaged in a through-hole TO-220-5 configuration. As an active product with ROHS3 compliance and unlimited moisture sensitivity rating, the LM2575-12WT remains in production. Equivalent and substitute parts may be required due to inventory constraints, application-specific performance requirements, or design optimization needs.

Substiute Parts

LM2575-12WT

Microchip TechnologyIn Stock: 7262LM2575-12WT Datasheet

Current PartRFQ

LM2596T-12/NOPB

Texas InstrumentsIn Stock: 1000441LM2596T-12/NOPB Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the LM2575-12WT is determined by the following critical parameters:

• Fixed output voltage of 12V
• TO-220-5 through-hole package configuration
• Input voltage range compatibility (minimum 4V, maximum 40V)
• Operating temperature range (-40°C to 125°C)
• Regulatory compliance (ROHS3, REACH Unaffected)

The LM2596T-12/NOPB qualifies as a substitute based on matching output voltage, package type, input voltage range, operating temperature, and compliance certifications. While the LM2596T-12/NOPB provides higher output current capability (3A versus 1A) and increased switching frequency (150kHz versus 52kHz), these represent performance enhancements rather than incompatibilities. The substitute maintains electrical and mechanical compatibility within the specified parameter constraints.

Parameter Comparison

Engineering Selection Recommendations

Both the LM2575-12WT and LM2596T-12/NOPB are active products with ROHS3 compliance and REACH unaffected status, meeting current regulatory requirements. The LM2596T-12/NOPB offers increased output current capacity (3A) and higher switching frequency (150kHz) compared to the LM2575-12WT (1A, 52kHz). Selection between these devices should be based on application current requirements and PCB layout considerations related to switching frequency. Both devices maintain identical fixed output voltage (12V), input voltage range compatibility (4V to 40V minimum, 40V maximum), operating temperature range (-40°C to 125°C), and through-hole TO-220-5 package configuration. The minimum input voltage specification for the LM2596T-12/NOPB is 4.5V compared to 4V for the LM2575-12WT; applications requiring operation below 4.5V input must use the LM2575-12WT.

Frequently Asked Questions (FAQ)

Q: Can the LM2596T-12/NOPB directly replace the LM2575-12WT in existing designs?

A: Direct replacement is possible from an electrical and mechanical standpoint. Both devices share identical 12V fixed output voltage, TO-220-5 through-hole package configuration, and -40°C to 125°C operating temperature range. The primary design consideration is the minimum input voltage specification: the LM2596T-12/NOPB requires 4.5V minimum input, while the LM2575-12WT operates from 4V minimum. Applications with input voltages between 4V and 4.5V must retain the LM2575-12WT.

Q: What are the implications of the higher output current rating on the LM2596T-12/NOPB?

A: The LM2596T-12/NOPB provides 3A output current capability compared to 1A on the LM2575-12WT. This represents a performance enhancement and does not create compatibility issues. Applications drawing less than 1A will operate identically on either device. Applications requiring 1A to 3A output current can utilize the LM2596T-12/NOPB for improved headroom and thermal performance.

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

A: The LM2596T-12/NOPB operates at 150kHz switching frequency versus 52kHz for the LM2575-12WT. Higher switching frequency typically allows for smaller output filter components. Both frequencies are within standard industrial ranges and do not create EMI compatibility issues in properly designed circuits. Existing filter component values designed for 52kHz will function with the 150kHz device without modification.

Q: Are there package lead configuration differences between these devices?

A: Both devices use TO-220-5 through-hole packages. The LM2596T-12/NOPB specifies "Formed Leads" in its package designation, indicating pre-bent leads for automated insertion. The LM2575-12WT does not specify formed leads. This distinction affects manufacturing processes but does not impact electrical performance or manual assembly compatibility.

Q: What compliance certifications apply to both devices?

A: Both the LM2575-12WT and LM2596T-12/NOPB are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements for electronic components in most jurisdictions.