ELF-24V028A Common Mode Choke Equivalent & Substitute Parts

Part Overview

The ELF-24V028A is a 2-line common mode choke (CMC) manufactured by Panasonic Electronic Components, designed for through-hole mounting applications. This component features a 2.8A maximum current rating and 100mOhm typical DC resistance. The part is currently classified as obsolete, making identification of suitable substitute components essential for ongoing system support, design updates, and procurement continuity.

Key Parameters

Parameter	Value
Manufacturer Part Number	ELF-24V028A
Manufacturer	Panasonic Electronic Components
Product Status	Obsolete
Number of Lines	2
Current Rating (Max)	2.8A
DC Resistance (DCR) (Max)	100mOhm (Typ)
Mounting Type	Through Hole
Package / Case	Vertical, 4 PC Pin
Size / Dimension	1.457" L x 0.945" W (37.00mm x 24.00mm)
Height (Max)	1.673" (42.50mm)
RoHS Status	RoHS non-compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the ELF-24V028A is determined by the following critical parameters:

Number of Lines: Must remain 2-line configuration for functional compatibility
Mounting Type: Through-hole mounting required for PCB assembly compatibility
Current Rating: Substitute must meet or exceed 2.8A to handle equivalent load conditions
DC Resistance: Substitute DCR must be compatible with circuit impedance requirements
Package Configuration: Pin count and orientation must support existing PCB layouts

Two substitute parts are identified based on these criteria:

RD6127-10-9M0 (Schaffner EMC Inc.): Exceeds current rating (10A typ) with significantly lower DCR (25.9mOhm typ), suitable for applications requiring enhanced performance margin and lower power dissipation. Horizontal mounting configuration.

EV28-3.0-02-9M0-X (Schaffner EMC Inc.): Meets current rating requirement (3A) with comparable DCR (115mOhm), maintains vertical mounting orientation similar to original part. Smaller footprint.

Parameter Comparison

Parameter	ELF-24V028A (Main)	EV28-3.0-02-9M0-X	RD6127-10-9M0
Manufacturer	Panasonic Electronic Components	Schaffner EMC Inc.	Schaffner EMC Inc.
Product Status	Obsolete	Active	Active
Number of Lines	2	2	2
Current Rating (Max)	2.8A	3A	10A (Typ)
DC Resistance (DCR) (Max)	100mOhm (Typ)	115mOhm	25.9mOhm (Typ)
Mounting Type	Through Hole	Through Hole	Through Hole
Package / Case	Vertical, 4 PC Pin	Vertical, 4 PC Pin	Horizontal, 4 PC Pin
Size / Dimension	1.457" L x 0.945" W (37.00mm x 24.00mm)	1.150" L x 0.827" W (29.20mm x 21.00mm)	2.362" L x 2.362" W (60.00mm x 60.00mm)
Height (Max)	1.673" (42.50mm)	1.406" (35.70mm)	1.398" (35.50mm)
Voltage Rating - AC	—	250V	600V
Voltage Rating - DC	—	—	850V
Operating Temperature	—	-25°C ~ 100°C	-25°C ~ 110°C
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

EV28-3.0-02-9M0-X is recommended for direct replacement in applications where:

PCB layout accommodates vertical mounting orientation
Current requirement does not exceed 3A
Space constraints favor smaller footprint (29.20mm x 21.00mm)
ROHS3 compliance is required for new designs or regulatory adherence
Operating temperature range of -25°C to 100°C is acceptable

RD6127-10-9M0 is recommended for applications where:

Higher current capacity (10A typ) provides design margin above 2.8A requirement
Lower DCR (25.9mOhm typ) reduces power dissipation compared to original specification
Higher voltage ratings (600V AC / 850V DC) are required
Extended operating temperature range (-25°C to 110°C) is necessary
Horizontal mounting orientation is compatible with PCB layout
ROHS3 compliance is required

Both substitute parts are manufactured by Schaffner EMC Inc. and carry active product status with ROHS3 compliance, ensuring long-term availability and regulatory alignment.

Frequently Asked Questions (FAQ)

Q: Can EV28-3.0-02-9M0-X be used as a direct drop-in replacement for ELF-24V028A?

A: EV28-3.0-02-9M0-X maintains the same 2-line configuration, through-hole mounting, vertical orientation, and 4-pin package as the original part. Current rating (3A) exceeds the ELF-24V028A requirement (2.8A), and DCR values are comparable (115mOhm vs 100mOhm typ). PCB layout compatibility depends on hole spacing and mounting pad configuration.

Q: What is the primary difference between the two substitute options?

A: EV28-3.0-02-9M0-X maintains form factor similarity to the original part with vertical mounting and smaller footprint. RD6127-10-9M0 offers significantly higher current capacity (10A typ) and lower DCR (25.9mOhm typ) but requires horizontal mounting and occupies a larger PCB area (60.00mm x 60.00mm).

Q: Are both substitute parts RoHS compliant?

A: Yes. Both EV28-3.0-02-9M0-X and RD6127-10-9M0 are ROHS3 compliant. The original ELF-24V028A is RoHS non-compliant, making either substitute suitable for applications requiring regulatory compliance.

Q: Does mounting orientation affect electrical performance?

A: Mounting orientation (vertical vs horizontal) does not affect electrical performance of common mode chokes. Selection between vertical and horizontal mounting is determined by PCB layout constraints and available board space.

Q: What are the voltage rating implications for substitution?

A: The original ELF-24V028A does not specify voltage ratings. EV28-3.0-02-9M0-X is rated for 250V AC, while RD6127-10-9M0 is rated for 600V AC and 850V DC. For applications operating above 250V AC, RD6127-10-9M0 is the appropriate selection.

Q: How do temperature operating ranges compare?

A: ELF-24V028A does not specify operating temperature. EV28-3.0-02-9M0-X operates from -25°C to 100°C, while RD6127-10-9M0 extends to -25°C to 110°C. Selection depends on application thermal environment requirements.

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