LM5021MM-1 Equivalent & Substitute Parts

Part Overview

The LM5021MM-1 is an offline switching converter controller IC designed for flyback and forward topology applications with operating frequencies up to 1MHz. Manufactured by Texas Instruments in an 8-VSSOP package, this device integrates current limiting and overload protection with soft start and frequency control features for isolated power supply designs.

The LM5021MM-1 is classified as obsolete, which necessitates identification of equivalent substitute components for new designs and production continuity. Substitute parts must maintain identical electrical specifications, package compatibility, and functional characteristics to ensure direct replacement without circuit redesign.

Substiute Parts

LM5021MM-1

Texas InstrumentsIn Stock: 8142LM5021MM-1 Datasheet

Current PartRFQ

LM5021MM-1/NOPB

Texas InstrumentsIn Stock: 38843LM5021MM-1/NOPB Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LM5021MM-1 is based on strict equivalence across the following critical parameters:

• Topology & Isolation: Flyback and forward converter topologies with isolated output
• Voltage Specifications: Supply range 8V ~ 30V and 20V start-up voltage
• Switching Frequency: Up to 1MHz operation
• Duty Cycle: 80% maximum
• Protection & Control: Current limiting, overload protection, frequency control, soft start, and sync features
• Package Compatibility: 8-VSSOP surface mount package with 8-TSSOP/8-MSOP footprint equivalence
• Temperature Range: -40°C ~ 125°C junction temperature rating

Only components matching all specified parameters are classified as direct substitutes.

Parameter Comparison

Engineering Selection Recommendations

The LM5021MM-1/NOPB is the direct parametric equivalent and substitute for the obsolete LM5021MM-1. Both components share identical electrical specifications, package footprint, and functional characteristics across all critical parameters.

The primary distinction between these parts is regulatory compliance status. The LM5021MM-1/NOPB carries ROHS3 compliance certification, whereas the original LM5021MM-1 is RoHS non-compliant. For applications subject to RoHS directives or environmental regulations, the LM5021MM-1/NOPB is the required selection.

The LM5021MM-1/NOPB is currently in Last Time Buy status with significantly higher inventory availability (38,733 units) compared to the obsolete original part (8,088 units). This substitute part is suitable for direct replacement in all existing circuit designs without modification to PCB layout, component values, or control circuitry.

Frequently Asked Questions (FAQ)

Q: Can the LM5021MM-1/NOPB be used as a direct replacement for the LM5021MM-1?

A: Yes. The LM5021MM-1/NOPB is a parametric equivalent with identical electrical specifications, package dimensions, and functional characteristics. No circuit modifications are required for substitution.

Q: What is the difference between LM5021MM-1 and LM5021MM-1/NOPB?

A: The primary difference is regulatory compliance. The LM5021MM-1/NOPB is ROHS3 compliant, while the original LM5021MM-1 is RoHS non-compliant. All electrical and mechanical specifications are identical.

Q: Are there any package compatibility concerns when substituting these parts?

A: No. Both parts use the 8-VSSOP surface mount package with identical 8-TSSOP and 8-MSOP footprint specifications (0.118", 3.00mm width). PCB layout and component placement require no changes.

Q: What is the significance of the /NOPB designation?

A: The /NOPB suffix indicates the component is supplied without lead (Pb) in the solder balls or leads, consistent with RoHS3 compliance requirements.

Q: Should I prioritize the LM5021MM-1/NOPB for new designs?

A: Yes. The LM5021MM-1/NOPB is in Last Time Buy status with higher inventory availability and RoHS3 compliance certification, making it the appropriate selection for new production designs and long-term supply chain continuity.