LM5021MMX-1 Equivalent & Substitute Parts

Part Overview

The LM5021MMX-1 is an offline switch controller IC designed for flyback and forward converter topologies in isolated power management applications. Manufactured by Texas Instruments, this device operates across a wide supply voltage range (8V to 30V) with switching frequencies up to 1MHz and integrated fault protection features including current limiting and overload protection.

The LM5021MMX-1 is classified as obsolete, which necessitates identification of equivalent substitute parts for new designs and ongoing production requirements. Direct manufacturer alternatives and parametric equivalents are available from Texas Instruments with improved product status and compliance certifications.

Substiute Parts

LM5021MMX-1

Texas InstrumentsIn Stock: 3652LM5021MMX-1 Datasheet

Current PartRFQ

LM5021MMX-1/NOPB

Texas InstrumentsIn Stock: 22827LM5021MMX-1/NOPB Datasheet

DirectRFQ

LM5021MM-1/NOPB

Texas InstrumentsIn Stock: 38843LM5021MM-1/NOPB Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LM5021MMX-1 is determined by strict alignment of the following electrical and mechanical parameters:

Critical Substitution Parameters:

• Topology: Flyback, Forward converter support
• Supply voltage range: 8V ~ 30V
• Switching frequency capability: Up to 1MHz
• Duty cycle: 80%
• Fault protection: Current Limiting and Over Load protection
• Control features: Frequency Control, Soft Start, Sync
• Output isolation: Isolated configuration
• Operating temperature: -40°C ~ 125°C
• Package: 8-VSSOP (8-TSSOP, 8-MSOP form factor)
• Mounting: Surface Mount

The substitute parts identified below maintain full electrical and mechanical compatibility with these parameters while offering improved product status and compliance certifications.

Parameter Comparison

Engineering Selection Recommendations

LM5021MMX-1/NOPB is the primary recommended substitute for the obsolete LM5021MMX-1. This part maintains full electrical compatibility across all critical parameters while offering Active product status and ROHS3 compliance certification. The switching frequency range (150kHz ~ 1MHz) encompasses the original specification. Inventory availability is substantial at 22,800 pieces.

LM5021MM-1/NOPB serves as a secondary parametric equivalent with Last Time Buy status and ROHS3 compliance. This part supports both Flyback and Forward topologies identical to the original specification and maintains all electrical parameters. Inventory availability is 38,733 pieces. Selection of this part should account for its Last Time Buy status in long-term production planning.

Both substitute parts are manufactured by Texas Instruments and maintain identical package specifications (8-VSSOP), mounting type (Surface Mount), and operating temperature range (-40°C ~ 125°C). Selection between LM5021MMX-1/NOPB and LM5021MM-1/NOPB should prioritize LM5021MMX-1/NOPB due to Active product status for new designs and ongoing production.

Frequently Asked Questions (FAQ)

Q: Can LM5021MMX-1/NOPB directly replace LM5021MMX-1 in existing designs?

A: Yes. LM5021MMX-1/NOPB maintains full electrical and mechanical compatibility. All critical parameters including supply voltage range (8V ~ 30V), switching frequency (150kHz ~ 1MHz), duty cycle (80%), fault protection, control features, and 8-VSSOP package are identical. Pin-for-pin compatibility is maintained.

Q: What is the difference between LM5021MMX-1/NOPB and LM5021MM-1/NOPB?

A: Both parts are parametric equivalents with identical electrical specifications. The primary difference is product status: LM5021MMX-1/NOPB is Active, while LM5021MM-1/NOPB is Last Time Buy. LM5021MM-1/NOPB additionally supports Forward topology in addition to Flyback, matching the original LM5021MMX-1 specification. For new designs, LM5021MMX-1/NOPB is recommended.

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

A: No. All three parts use identical 8-VSSOP package (8-TSSOP, 8-MSOP form factor with 0.118" width, 3.00mm) and Surface Mount mounting type. PCB layout and assembly processes require no modification.

Q: What compliance certifications apply to the substitute parts?

A: LM5021MMX-1/NOPB and LM5021MM-1/NOPB are both ROHS3 compliant, whereas the original LM5021MMX-1 is RoHS non-compliant. Both substitutes are REACH Unaffected and classified under ECCN EAR99.

Q: Are there switching frequency differences that affect circuit design?

A: LM5021MMX-1/NOPB specifies 150kHz ~ 1MHz switching frequency, while the original LM5021MMX-1 specifies Up to 1MHz. Both ranges support the same maximum frequency. Designs operating at frequencies below 150kHz should be evaluated against LM5021MMX-1/NOPB specifications.

Q: What inventory considerations exist for these substitutes?

A: LM5021MMX-1/NOPB has 22,800 pieces in stock (Active status). LM5021MM-1/NOPB has 38,733 pieces in stock (Last Time Buy status). For long-term production, LM5021MMX-1/NOPB is preferred due to Active product status and ongoing availability.