ELF-21V007A Common Mode Choke Equivalent & Substitute Parts

Part Overview

The ELF-21V007A is a 2-line common mode choke (CMC) designed for through-hole mounting with a maximum current rating of 700mA and typical DC resistance of 1.212Ohm. Manufactured by Panasonic Electronic Components as part of the V series, this component is classified as obsolete product status. Due to its obsolete designation, identifying functionally equivalent substitute parts is essential for ongoing design support, production continuity, and system maintenance.

Substiute Parts

ELF-21V007A

Panasonic Electronic ComponentsIn Stock: 1200ELF-21V007A Datasheet

Current PartRFQ

B82734R2701B030

EPCOS - TDK ElectronicsIn Stock: 756B82734R2701B030 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the ELF-21V007A is determined by the following critical parameters:

• Number of Lines: Must be 2-line configuration
• Current Rating: Must support minimum 700mA
• Mounting Type: Must be through-hole
• Package Configuration: Must be vertical, 4 PC pin
• DC Resistance: Should be within acceptable operating range for the application circuit
• Physical Dimensions: Must fit within or be compatible with existing PCB layout constraints

The substitute part B82734R2701B030 from EPCOS - TDK Electronics meets these core substitution criteria. Both parts share identical line count, current rating, mounting type, and pin configuration. Physical dimensions are comparable with minor variations in length and height. The substitute maintains through-hole vertical mounting compatibility and 4-pin package structure.

Parameter Comparison

Engineering Selection Recommendations

The B82734R2701B030 serves as a direct functional substitute for the ELF-21V007A based on matching electrical specifications and package configuration. Key selection considerations:

Product Status: The substitute part maintains active product status with ongoing manufacturer support, addressing the obsolescence limitation of the original part.

Compliance & Certifications: The B82734R2701B030 holds ROHS3 compliance and REACH affected status, with recognized approvals from ENEC, UR, and VDE. The original ELF-21V007A is RoHS non-compliant, making the substitute preferable for applications requiring modern regulatory compliance.

Electrical Performance: Both parts support identical 700mA current ratings and 2-line common mode choke configuration. DC resistance differs by 0.238Ohm (1.45Ohm vs 1.212Ohm typical), which must be evaluated within specific circuit requirements.

Physical Compatibility: The substitute exhibits minor dimensional variations. Length increases by 0.138" (4.60mm), while height decreases by 0.178" (4.50mm). Width remains identical at 0.827" (21.00mm). PCB layout verification is required to confirm fit within existing mounting constraints.

Environmental Specifications: The substitute provides defined operating temperature range (-40°C ~ 125°C) and AC voltage rating (250V), parameters not specified for the original part.

Frequently Asked Questions (FAQ)

Q: Can B82734R2701B030 directly replace ELF-21V007A without circuit modification?

A: Both parts share identical current rating (700mA), line count (2), mounting type (through-hole), and pin configuration (vertical, 4 PC). DC resistance differs by 0.238Ohm. Circuit validation is required to confirm the resistance variation does not impact performance. Physical dimensions must be verified against PCB layout constraints.

Q: What are the key differences between these two parts?

A: Primary differences include manufacturer (Panasonic vs EPCOS-TDK), product status (obsolete vs active), RoHS compliance (non-compliant vs ROHS3 compliant), DC resistance (1.212Ohm vs 1.45Ohm typical), and physical dimensions. The substitute provides defined environmental specifications and regulatory certifications absent from the original part.

Q: Is the substitute part RoHS compliant?

A: Yes, B82734R2701B030 is ROHS3 compliant. The original ELF-21V007A is RoHS non-compliant. This distinction is significant for applications subject to RoHS regulations.

Q: What is the impact of the 0.238Ohm DC resistance difference?

A: The substitute exhibits 0.238Ohm higher typical DC resistance (1.45Ohm vs 1.212Ohm). This affects power dissipation and voltage drop characteristics. Circuit analysis is necessary to determine acceptability within application-specific requirements.

Q: Are the physical dimensions compatible with existing PCB layouts?

A: The substitute is 0.138" (4.60mm) longer and 0.178" (4.50mm) shorter in height, with identical width. PCB layout review is required to confirm the substitute fits within available mounting space and clearance requirements.

Q: What certifications does the substitute part hold?

A: B82734R2701B030 holds ENEC, UR, and VDE approvals. The original part specifies no approval agencies. These certifications support compliance with international safety and performance standards.