LM2574BN Equivalent & Substitute Parts

Part Overview

The LM2574BN is a buck switching regulator IC from Microchip Technology designed for step-down voltage conversion applications. It delivers positive adjustable output from 1.23V to 37V with a maximum output current of 500mA, operating at a fixed switching frequency of 52kHz. The device is packaged in an 8-DIP (0.300", 7.62mm) through-hole configuration.

The LM2574BN is classified as obsolete. Identifying equivalent substitute parts is necessary to ensure design continuity, maintain supply chain reliability, and support ongoing production or maintenance requirements for systems utilizing this component.

Substiute Parts

LM2574BN

Microchip TechnologyIn Stock: 22087LM2574BN Datasheet

Current PartRFQ

LM2574YN

Microchip TechnologyIn Stock: 12555LM2574YN Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LM2574BN is determined by strict equivalence across the following critical parameters:

• Output topology (buck/step-down configuration)
• Output voltage adjustability range (1.23V to 37V minimum)
• Output current capability (500mA minimum)
• Switching frequency (52kHz)
• Input voltage rating (40V maximum)
• Operating temperature range (-40°C to 125°C)
• Package form factor (8-DIP through-hole)
• Synchronous rectifier configuration (non-synchronous)

The LM2574YN qualifies as a direct substitute based on identical electrical specifications and package compatibility. The primary distinction is product status and compliance certification.

Parameter Comparison

Engineering Selection Recommendations

The LM2574YN is the direct substitute for the LM2574BN. Both devices share identical electrical and mechanical specifications, ensuring pin-for-pin and functional compatibility in existing circuit designs.

The LM2574YN offers two significant advantages over the obsolete LM2574BN:

• Active product status ensures ongoing availability and manufacturer support
• RoHS3 compliance satisfies current environmental and regulatory requirements for new designs and production runs

For applications requiring RoHS non-compliant components or legacy system maintenance, the LM2574BN remains available in existing inventory. For new designs or systems requiring regulatory compliance, the LM2574YN is the appropriate selection.

Frequently Asked Questions (FAQ)

Q: Are the LM2574BN and LM2574YN pin-compatible?

A: Yes. Both devices use the 8-DIP (0.300", 7.62mm) package with identical pinout and electrical characteristics. Direct substitution is possible without circuit modification.

Q: What is the difference between the LM2574BN and LM2574YN?

A: The LM2574YN is the active production variant of the LM2574 series. The LM2574BN is obsolete. Both deliver identical electrical performance: 500mA output current, 1.23V to 37V adjustable output, 52kHz switching frequency, and 40V maximum input voltage. The LM2574YN includes RoHS3 compliance; the LM2574BN does not.

Q: Can I use the LM2574YN in a design originally specified for the LM2574BN?

A: Yes. The LM2574YN is a direct functional and mechanical equivalent. No circuit redesign is required. The LM2574YN is recommended for new designs and production systems.

Q: What packaging options are available for these parts?

A: Both the LM2574BN and LM2574YN are supplied in 8-DIP through-hole packages. The LM2574YN is available in tube packaging format.

Q: Are there any thermal or frequency differences between these substitutes?

A: No. Both devices operate across the same temperature range (-40°C to 125°C junction temperature) and switch at 52kHz. Thermal and frequency performance are identical.