ELF-22V020C Common Mode Choke Equivalent & Substitute Parts

Part Overview

The ELF-22V020C is a 2-line common mode choke (CMC) manufactured by Panasonic Electronic Components, designed for through-hole mounting applications requiring 2A current handling capability. This component is classified as obsolete, making identification of functionally equivalent substitute parts essential for ongoing system support, design updates, and procurement continuity.

Common mode chokes in this category are used for electromagnetic interference (EMI) suppression and power line filtering in electronic equipment. The obsolete status of the ELF-22V020C necessitates evaluation of active alternative components that maintain electrical and mechanical compatibility with existing designs.

Key Parameters

Parameter	ELF-22V020C
Manufacturer	Panasonic Electronic Components
Product Status	Obsolete
Number of Lines	2
Current Rating (Max)	2A
DC Resistance (DCR) (Max)	170mOhm (Typ)
Mounting Type	Through Hole
Package / Case	Vertical, 4 PC Pin
Size / Dimension	1.260" L x 0.906" W (32.00mm x 23.00mm)
Height (Max)	1.535" (39.00mm)
RoHS Status	RoHS non-compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the ELF-22V020C is determined by the following critical parameters:

Number of Lines: Must be 2-line configuration for common mode filtering function
Current Rating: Substitute must support minimum 2A; higher ratings provide design margin
DC Resistance (DCR): Substitute DCR must not exceed the original specification to maintain power efficiency and thermal performance
Mounting Type: Through-hole mounting required for PCB compatibility
Package Configuration: Vertical, 4-pin package required for mechanical fit and board layout compatibility
Physical Dimensions: Substitute footprint must accommodate existing PCB layout constraints

The CMT908-V4 manufactured by Triad Magnetics meets these substitution criteria as a 2-line common mode choke with through-hole vertical mounting, 4-pin configuration, and electrical ratings compatible with the ELF-22V020C application requirements.

Parameter Comparison

Parameter	ELF-22V020C (Panasonic)	CMT908-V4 (Triad Magnetics)	Compatibility Assessment
Number of Lines	2	2	Match
Current Rating (Max)	2A	2.6A	Compatible (higher rating)
DC Resistance (DCR) (Max)	170mOhm (Typ)	160mOhm	Compatible (lower DCR)
Mounting Type	Through Hole	Through Hole	Match
Package / Case	Vertical, 4 PC Pin	Vertical, 4 PC Pin	Match
Size / Dimension	1.260" L x 0.906" W (32.00mm x 23.00mm)	1.450" L x 0.800" W (36.83mm x 20.32mm)	Similar footprint; verify PCB layout clearance
Height (Max)	1.535" (39.00mm)	1.500" (38.10mm)	Compatible (slightly lower profile)
Voltage Rating - AC	Not specified	1500V (1.5kV)	CMT908-V4 provides specified rating
Operating Temperature	Not specified	-40°C ~ 125°C	CMT908-V4 provides specified range
RoHS Status	RoHS non-compliant	ROHS3 Compliant	CMT908-V4 meets current environmental standards
Product Status	Obsolete	Active	CMT908-V4 actively manufactured and available

Engineering Selection Recommendations

The CMT908-V4 is the designated substitute for the obsolete ELF-22V020C based on the following engineering criteria:

Electrical Compatibility: The CMT908-V4 exceeds the current rating requirement (2.6A vs. 2A) and provides lower DC resistance (160mOhm vs. 170mOhm), resulting in improved efficiency and reduced thermal dissipation in the application circuit.

Mechanical Compatibility: Both components feature identical 2-line through-hole vertical mounting with 4-pin configuration. Physical dimensions are similar, with the CMT908-V4 providing a slightly lower profile (38.10mm vs. 39.00mm height), which may improve PCB layout flexibility.

Regulatory and Compliance Status: The CMT908-V4 is ROHS3 compliant and actively manufactured by Triad Magnetics, addressing the obsolescence of the ELF-22V020C. The substitute carries CSA, IEC, UL, and VDE approvals, providing enhanced certification coverage for industrial and commercial applications.

Availability: The CMT908-V4 is in active production with substantial inventory availability (7698 pieces), ensuring reliable procurement for new designs and legacy system support.

Frequently Asked Questions (FAQ)

Q: Can the CMT908-V4 directly replace the ELF-22V020C without PCB modifications?

A: The CMT908-V4 is mechanically and electrically compatible with the ELF-22V020C for through-hole mounting applications. However, verify PCB layout clearance, as the CMT908-V4 length is 36.83mm compared to the ELF-22V020C at 32.00mm. No circuit modifications are required due to equivalent electrical performance.

Q: What is the significance of the higher current rating on the CMT908-V4?

A: The CMT908-V4 is rated for 2.6A maximum current versus 2A for the ELF-22V020C. This higher rating provides design margin and thermal headroom in the application, reducing component stress and extending operational life without circuit redesign.

Q: Does the lower DC resistance of the CMT908-V4 affect circuit performance?

A: The CMT908-V4 DCR of 160mOhm is lower than the ELF-22V020C at 170mOhm (Typ). Lower DCR reduces power loss and heat generation, improving overall system efficiency. This change is beneficial and requires no circuit compensation.

Q: Are there environmental or compliance differences between these components?

A: The ELF-22V020C is RoHS non-compliant, while the CMT908-V4 is ROHS3 compliant. The CMT908-V4 also carries CSA, IEC, UL, and VDE certifications and operates across -40°C to 125°C, providing broader regulatory acceptance for modern applications.

Q: What should be verified before implementing the CMT908-V4 as a substitute?

A: Confirm PCB layout accommodates the CMT908-V4 dimensions (36.83mm L x 20.32mm W x 38.10mm H). Verify pin spacing and mounting hole alignment match the 4-pin vertical configuration. Validate that the 1500V AC voltage rating and -40°C to 125°C operating temperature range meet application requirements.

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