LM5021MMX-2 Equivalent & Substitute Parts

Part Overview

The LM5021MMX-2 is an offline switching converter controller manufactured by Texas Instruments, designed for flyback and forward topology applications with switching frequencies up to 1MHz. This PMIC operates across a supply voltage range of 8V to 30V and integrates current limiting and overload fault protection with soft start and frequency control features.

The LM5021MMX-2 carries a "Not For New Designs" product status, indicating it has reached end-of-life phase. Identifying equivalent substitute parts is necessary to ensure design continuity, maintain supply chain reliability, and transition to actively supported alternatives where applicable.

Substiute Parts

LM5021MMX-2

Texas InstrumentsIn Stock: 1984LM5021MMX-2 Datasheet

Current PartRFQ

LM5021MM-2/NOPB

Texas InstrumentsIn Stock: 3415LM5021MM-2/NOPB Datasheet

Parametric EquivalentRFQ

LM5021MMX-2/NOPB

Texas InstrumentsIn Stock: 5152LM5021MMX-2/NOPB Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the LM5021MMX-2 are identified based on strict parametric equivalence across the following criteria:

• Identical topology (Flyback, Forward)
• Matching voltage supply range (8V ~ 30V)
• Equivalent switching frequency capability (Up to 1MHz)
• Same duty cycle specification (50%)
• Identical fault protection features (Current Limiting, Overload)
• Matching control features (Frequency Control, Soft Start, Sync)
• Identical operating temperature range (-40°C ~ 125°C)
• Compatible package and pinout (8-TSSOP, 8-MSOP)
• Same output isolation characteristic (Isolated)

The substitute parts identified—LM5021MM-2/NOPB and LM5021MMX-2/NOPB—meet all these parametric requirements and share the same base product number (LM5021), confirming functional and electrical equivalence.

Parameter Comparison

Engineering Selection Recommendations

LM5021MMX-2/NOPB is the primary recommended substitute. This part maintains active product status with Texas Instruments, ensuring ongoing technical support and supply availability. It carries ROHS3 compliance certification and is available in higher inventory quantities (5100 pcs), providing supply chain stability for new designs and production continuity.

LM5021MM-2/NOPB serves as a secondary alternative with Last Time Buy status. While ROHS3 compliant, this part represents a transitional phase toward discontinuation. It is suitable for existing production runs requiring immediate substitution but should not be selected for new design implementations.

The original LM5021MMX-2 (Not For New Designs status, RoHS non-compliant) should be phased out in favor of LM5021MMX-2/NOPB to align with current regulatory requirements and ensure long-term design support.

Frequently Asked Questions (FAQ)

Q: Are LM5021MMX-2, LM5021MM-2/NOPB, and LM5021MMX-2/NOPB electrically interchangeable?

A: Yes. All three parts share identical electrical specifications across topology, voltage range, switching frequency, duty cycle, fault protection, control features, and operating temperature. They are parametrically equivalent and functionally interchangeable in circuit applications.

Q: What is the difference between these part numbers?

A: The differences are packaging format and product lifecycle status. LM5021MMX-2 uses Tape & Reel packaging and carries Not For New Designs status. LM5021MM-2/NOPB uses Cut Tape & Digi-Reel packaging with Last Time Buy status. LM5021MMX-2/NOPB maintains Tape & Reel format with Active product status. The "/NOPB" suffix indicates lead-free (Pb-free) compliance.

Q: Can I use LM5021MMX-2/NOPB as a direct replacement for LM5021MMX-2?

A: Yes. Both parts use identical 8-TSSOP, 8-MSOP packaging with 0.118" width and 3.00mm dimensions. Pin configuration and electrical characteristics are identical, enabling direct PCB substitution without layout modifications.

Q: Which substitute should I select for new product designs?

A: LM5021MMX-2/NOPB is the appropriate choice for new designs. It maintains Active product status, ROHS3 compliance, and higher inventory availability, ensuring design longevity and regulatory alignment.

Q: Are there RoHS compliance differences between these parts?

A: Yes. LM5021MMX-2 is RoHS non-compliant. Both LM5021MM-2/NOPB and LM5021MMX-2/NOPB are ROHS3 compliant. For applications requiring RoHS certification, select either substitute part.