LM2574N-ADJ Equivalent & Substitute Parts

Part Overview

The LM2574N-ADJ is a multi-configuration adjustable switching regulator IC from onsemi, capable of operating in buck, boost, or buck-boost topologies with a 500mA output current rating. The device supports positive or negative output configurations with an adjustable output voltage range from 1.23V to 37V and operates across a wide input voltage range of 4.75V to 40V. The LM2574N-ADJ is classified as obsolete, making identification of equivalent and substitute parts essential for ongoing design support and production continuity.

Substiute Parts

LM2574N-ADJ

onsemiIn Stock: 2298LM2574N-ADJ Datasheet

Current PartRFQ

LM2574N-ADJG

onsemiIn Stock: 4440LM2574N-ADJG Datasheet

DirectRFQ

LM2574YN

Microchip TechnologyIn Stock: 12555LM2574YN Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the LM2574N-ADJ are identified based on strict electrical and mechanical compatibility criteria. The primary substitution parameters are:

Electrical Compatibility Criteria:

• Input voltage range: 4.75V to 40V minimum
• Output voltage range: 1.23V to 37V minimum
• Output current: 500mA minimum
• Switching frequency: 52kHz
• Operating temperature: -40°C to 125°C minimum
• Package type: 8-DIP (0.300", 7.62mm)
• Mounting type: Through Hole

Substitution Categories:

Direct Equivalent (Identical Electrical & Mechanical Specifications): LM2574N-ADJG maintains all electrical parameters and package specifications of the original part, with the primary difference being packaging format (Tube) and active product status.

Similar Substitute (Reduced Topology Flexibility): LM2574YN from Microchip Technology provides buck topology operation only, eliminating boost and buck-boost capabilities. This part maintains the same output current, voltage ranges, switching frequency, package, and operating temperature specifications. The LM2574YN is suitable only for applications requiring step-down regulation.

Parameter Comparison

Engineering Selection Recommendations

LM2574N-ADJG (Direct Equivalent): This part is the primary substitute for the obsolete LM2574N-ADJ. It provides identical electrical specifications and package configuration while maintaining active product status. The LM2574N-ADJG achieves ROHS3 compliance, addressing regulatory requirements that may not be met by the original part. This substitute is suitable for all applications originally designed for the LM2574N-ADJ without circuit modification.

LM2574YN (Similar Substitute): This part is applicable only to designs requiring buck (step-down) topology operation. The LM2574YN eliminates boost and buck-boost functionality, restricting its use to applications where the input voltage is always higher than the required output voltage. The LM2574YN achieves ROHS3 compliance and maintains the same output current, voltage ranges, switching frequency, and operating temperature specifications. Circuit redesign is required if boost or buck-boost operation is necessary.

Frequently Asked Questions (FAQ)

Q: Can LM2574N-ADJG be used as a direct replacement for LM2574N-ADJ?

A: Yes. The LM2574N-ADJG maintains identical electrical specifications, output voltage range (1.23V to 37V), input voltage range (4.75V to 40V), output current (500mA), switching frequency (52kHz), operating temperature range (-40°C to 125°C), and 8-DIP package configuration. No circuit modification is required.

Q: What is the key limitation of LM2574YN compared to LM2574N-ADJ?

A: The LM2574YN supports buck topology only, eliminating boost and buck-boost operation. It cannot step up voltage or operate in buck-boost mode. Use LM2574YN only for applications requiring step-down regulation where input voltage exceeds output voltage requirements.

Q: Are there packaging differences between LM2574N-ADJ and LM2574N-ADJG?

A: Both parts use the same 8-DIP (0.300", 7.62mm) package and through-hole mounting type. The primary difference is the supplier packaging format (Tube for LM2574N-ADJG), which does not affect electrical or mechanical compatibility.

Q: What compliance improvements do the substitute parts offer?

A: Both LM2574N-ADJG and LM2574YN achieve ROHS3 compliance, whereas the original LM2574N-ADJ is RoHS non-compliant. This addresses regulatory requirements for new designs and production runs.

Q: Can LM2574YN replace LM2574N-ADJ in a boost or buck-boost application?

A: No. LM2574YN supports buck topology only and cannot be used in applications requiring boost or buck-boost operation. LM2574N-ADJG is the appropriate substitute for such applications.