LM2575BN Equivalent & Substitute Parts

Part Overview

The LM2575BN 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 1A output current capability in a 16-DIP through-hole package. The device operates across a 4V to 40V input range with a 52kHz switching frequency and supports operating temperatures from -40°C to 125°C.

The LM2575BN is classified as obsolete. Identifying equivalent and 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

LM2575BN

Microchip TechnologyIn Stock: 1031LM2575BN Datasheet

Current PartRFQ

LM2575YN

Microchip TechnologyIn Stock: 823LM2575YN Datasheet

DirectRFQ

LM2575IN

Texas InstrumentsIn Stock: 1404LM2575IN Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the LM2575BN is determined by strict alignment across the following critical parameters:

• Topology & Function: Buck (step-down) switching regulator with positive adjustable output
• Output Specifications: 1A output current, adjustable output from 1.23V minimum
• Input Voltage Range: Minimum 4V input capability
• Switching Frequency: 52kHz operation
• Package & Mounting: 16-DIP through-hole configuration (0.300", 7.62mm)
• Operating Temperature: -40°C to 125°C junction temperature range
• Synchronous Rectifier: Not present (asynchronous topology)

The identified substitutes maintain electrical equivalence across all core functional parameters while differing in product status, compliance certifications, and packaging specifications.

Parameter Comparison

Engineering Selection Recommendations

LM2575YN (Microchip Technology)

The LM2575YN is a direct Microchip equivalent maintaining identical electrical specifications to the LM2575BN. This substitute is classified as active product status and carries ROHS3 compliance certification. The primary distinction is MSL rating (3 vs. 1), indicating moisture sensitivity requirements during storage and handling. Selection of LM2575YN is appropriate for applications requiring Microchip sourcing continuity and modern compliance standards.

LM2575IN (Texas Instruments)

The LM2575IN is a manufacturer-recommended substitute from Texas Instruments within the SIMPLE SWITCHER® series. Electrical performance is equivalent across all critical parameters with one exception: minimum input voltage is specified at 4.75V versus 4V for the main part. This substitute carries ROHS3 compliance and is classified as active product status. The LM2575IN is suitable for applications where input voltage remains above 4.75V and cross-manufacturer sourcing is acceptable. MSL rating is not applicable, indicating different moisture handling protocols.

Frequently Asked Questions (FAQ)

Q: Can LM2575YN and LM2575IN be used interchangeably with LM2575BN?

A: Both substitutes maintain electrical equivalence across core functional parameters: buck topology, 1A output current, 52kHz switching frequency, adjustable output from 1.23V, and 16-DIP through-hole packaging. Direct substitution is supported from an electrical standpoint. Design verification is required for applications operating at input voltages below 4.75V, as the LM2575IN specifies a 4.75V minimum input.

Q: What is the significance of the product status change from Obsolete to Active?

A: Active product status indicates ongoing manufacturer support, continued availability, and compliance with current regulatory standards. Obsolete status for the LM2575BN reflects end-of-life designation. Substitution to active parts ensures long-term supply chain reliability and access to technical support.

Q: How do RoHS compliance differences affect part selection?

A: The LM2575BN is RoHS non-compliant, while both LM2575YN and LM2575IN are ROHS3 compliant. For applications subject to RoHS regulations or customer requirements mandating compliant components, substitution to LM2575YN or LM2575IN is necessary.

Q: What does MSL rating mean for these parts?

A: MSL (Moisture Sensitivity Level) indicates moisture absorption characteristics during storage. LM2575BN carries MSL 1 (unlimited shelf life without moisture control). LM2575YN carries MSL 3 (168-hour limit after bag opening before reflow). LM2575IN has no MSL rating. For through-hole components with extended storage periods, MSL differences have minimal practical impact compared to surface-mount devices.

Q: Are there package or pinout differences between these parts?

A: All three parts utilize identical 16-DIP (0.300", 7.62mm) through-hole packaging with matching pinout. Direct PCB substitution is supported without layout modifications.

Q: What input voltage consideration applies to LM2575IN?

A: The LM2575IN specifies 4.75V minimum input voltage compared to 4V for LM2575BN and LM2575YN. Applications requiring operation below 4.75V must use LM2575BN or LM2575YN. Applications with input voltage guaranteed above 4.75V can use any of the three parts.