LM2574N-005 Equivalent & Substitute Parts

Part Overview

The LM2574N-005 is a multi-configuration switching regulator IC manufactured by onsemi, designed for buck, boost, and buck-boost topologies with a fixed 5V output at 500mA capacity. This device operates across a wide input voltage range of 4.75V to 40V and is housed in an 8-DIP package with a switching frequency of 52kHz. The product is currently obsolete, making equivalent substitute parts necessary for new designs and ongoing system support.

Substiute Parts

LM2574N-005

onsemiIn Stock: 1153LM2574N-005 Datasheet

Current PartRFQ

LM2574-5.0YN

Microchip TechnologyIn Stock: 2685LM2574-5.0YN Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the LM2574N-005 is determined by the following critical parameters:

• Output Voltage: Fixed 5V output is mandatory
• Output Current: 500mA minimum capacity required
• Input Voltage Range: Maximum 40V input support required
• Package Type: 8-DIP (0.300", 7.62mm) through-hole mounting
• Switching Frequency: 52kHz operation
• Operating Temperature Range: -40°C to 125°C (TJ)

The LM2574-5.0YN qualifies as a direct substitute based on these parameters. While the LM2574-5.0YN operates in a buck topology (step-down only) compared to the multi-configuration capability of the LM2574N-005, it meets all electrical and mechanical requirements for applications requiring fixed 5V regulation at 500mA from input sources up to 40V in the specified package.

Parameter Comparison

Engineering Selection Recommendations

The LM2574-5.0YN is the qualified substitute for the obsolete LM2574N-005 based on matching electrical specifications and package compatibility. The substitute part is manufactured by Microchip Technology and maintains active product status, ensuring long-term availability and supply chain continuity.

Key selection factors:

• Compliance: The LM2574-5.0YN is ROHS3 compliant, whereas the original LM2574N-005 is RoHS non-compliant. This compliance advantage supports modern manufacturing and environmental standards.
• Availability: Active product status of the substitute ensures reliable sourcing compared to the obsolete original.
• Functional Scope: Applications requiring only buck (step-down) regulation will operate identically. Applications originally designed for boost or buck-boost topologies require circuit redesign to accommodate the buck-only topology of the substitute.
• Electrical Equivalence: Identical output voltage, current rating, input voltage range, switching frequency, and operating temperature range ensure direct electrical compatibility for buck-mode applications.

Frequently Asked Questions (FAQ)

Q: Can the LM2574-5.0YN directly replace the LM2574N-005 in all applications?

A: Direct replacement is valid for applications using buck (step-down) topology only. If the original design utilized boost or buck-boost configurations, circuit redesign is required. The substitute supports only positive output configuration, whereas the original supported positive or negative outputs.

Q: What are the key electrical parameters that determine substitution compatibility?

A: The critical parameters are fixed 5V output voltage, 500mA output current, maximum 40V input voltage, 52kHz switching frequency, -40°C to 125°C operating temperature range, and 8-DIP package format. All these parameters match between the main part and substitute.

Q: Does the package format remain identical?

A: Yes. Both the LM2574N-005 and LM2574-5.0YN use the 8-DIP (0.300", 7.62mm) through-hole package, enabling direct PCB compatibility without layout modifications.

Q: What is the significance of the RoHS compliance difference?

A: The LM2574-5.0YN is ROHS3 compliant while the original is RoHS non-compliant. This compliance status is relevant for new designs and manufacturing environments subject to RoHS regulations. Existing legacy systems using the original part are not affected by this difference.

Q: Are there any functional limitations when using the substitute?

A: The LM2574-5.0YN operates exclusively in buck topology, providing step-down regulation only. The original LM2574N-005 supported multiple topologies (buck, boost, buck-boost). If your application requires boost or buck-boost functionality, the substitute is not suitable without circuit redesign.