ERZ-SF2MK121 Equivalent & Substitute Parts

Part Overview

The ERZ-SF2MK121 is a 120 V, 600 A Transient Voltage Suppressor (TVS) varistor manufactured by Panasonic Electronic Components. This component is designed for surface mount applications using a 2-SMD J-Lead package configuration. The part operates across a temperature range of -40°C to 85°C and is classified as obsolete, necessitating identification of active equivalent alternatives for new designs and ongoing production requirements.

Substiute Parts

ERZ-SF2MK121

Panasonic Electronic ComponentsIn Stock: 1060ERZ-SF2MK121 Datasheet

Current PartRFQ

ERZ-VF2M121

Panasonic Electronic ComponentsIn Stock: 2598ERZ-VF2M121 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the ERZ-SF2MK121 is determined by the following critical parameters:

• Varistor Voltage Range: 108 V (Min) to 132 V (Typ: 120 V, Max: 132 V)
• Surge Current Rating: 600 A minimum
• Maximum AC/DC Voltage Ratings: 75 V AC / 100 V DC
• Package Configuration: 2-SMD, J-Lead surface mount
• Number of Circuits: Single circuit (1)
• Operating Temperature: -40°C to 85°C

The ERZ-VF2M121 meets all these electrical and mechanical specifications while offering improved energy handling and active product status.

Parameter Comparison

Engineering Selection Recommendations

The ERZ-VF2M121 is the direct equivalent substitute for the ERZ-SF2MK121. Both components share identical electrical specifications across all critical parameters: varistor voltage range (108 V to 132 V), surge current capacity (600 A), maximum voltage ratings, circuit count, and operating temperature range.

The ERZ-VF2M121 offers two significant advantages:

• Active Product Status: The substitute is currently in active production, ensuring long-term availability and supply chain continuity.
• Regulatory Compliance: The ERZ-VF2M121 is ROHS3 compliant, meeting current environmental and regulatory requirements, whereas the main part is non-compliant.
• Enhanced Energy Rating: The substitute provides 14.6 J energy handling compared to 5 J in the original part, offering improved transient suppression capability.

For new designs and production transitions, the ERZ-VF2M121 is the appropriate selection.

Frequently Asked Questions (FAQ)

Q: Can the ERZ-VF2M121 be used as a direct replacement for the ERZ-SF2MK121?

A: Yes. Both components are electrically and mechanically identical across all critical specifications: 120 V varistor voltage, 600 A surge current, 75 V AC / 100 V DC maximum ratings, single circuit configuration, and 2-SMD J-Lead package. The substitute is pin-compatible and functionally equivalent.

Q: What is the difference in energy rating between these parts?

A: The ERZ-SF2MK121 is rated at 5 J, while the ERZ-VF2M121 is rated at 14.6 J. Both meet the electrical requirements for the same voltage and current specifications. The higher energy rating in the substitute provides additional transient suppression capability.

Q: Why is the ERZ-SF2MK121 marked as obsolete?

A: The ERZ-SF2MK121 has been discontinued by Panasonic Electronic Components. The ERZ-VF2M121 is the active equivalent that replaces it in current production.

Q: Are there packaging differences between these parts?

A: The ERZ-SF2MK121 is supplied in bulk packaging, while the ERZ-VF2M121 is supplied in Tape & Reel (TR) format. Both use the same 2-SMD J-Lead package configuration and are compatible with standard surface mount assembly processes.

Q: Does the ERZ-VF2M121 meet current regulatory requirements?

A: Yes. The ERZ-VF2M121 is ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory standards. The original ERZ-SF2MK121 is RoHS non-compliant.