KEMET SC-05-21J Common Mode Choke Equivalent & Substitute Parts

Part Overview

The KEMET SC-05-21J is a 2 mH common mode choke designed for power line filtering applications. This through-hole mounted component operates at 5A maximum current with 40mOhm DC resistance and is rated for 250V DC/AC operation across an extended temperature range of -40°C to 120°C. The part is ROHS3 compliant and maintains active product status. Substitute parts are identified based on matching electrical and mechanical parameters within the SC-J series family, enabling component selection flexibility for equivalent circuit performance.

Key Parameters

Parameter	SC-05-21J
Inductance @ Frequency	2 mH @ 100 kHz
Current Rating (Max)	5A
DC Resistance (Max)	40mOhm
Voltage Rating - DC	250V
Voltage Rating - AC	250V
Operating Temperature	-40°C ~ 120°C
Mounting Type	Through Hole
Number of Lines	2
Filter Type	Power Line
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the SC-05-21J are selected based on the following criteria:

Mandatory Matching Parameters:

Mounting Type: Through Hole
Number of Lines: 2
Filter Type: Power Line
Voltage Rating: 250V DC/AC minimum
Operating Temperature Range: -40°C ~ 120°C minimum
RoHS Status: ROHS3 Compliant
Series Family: SC-J

Allowed Variation Parameters:

Inductance @ Frequency: Variation permitted within circuit design tolerance
Current Rating: Equal or greater than 5A
DC Resistance: Up to 46mOhm maximum
Physical dimensions: Variation acceptable for through-hole mounting compatibility

The four identified substitutes (SC-05-15J, SC-05-27J, SC-06-40J, SC22-06-60J) meet all mandatory matching criteria while offering different inductance values and current ratings for application-specific requirements.

Parameter Comparison

Parameter	SC-05-21J	SC-05-15J	SC-05-27J	SC-06-40J	SC22-06-60J
Inductance @ Frequency	2 mH @ 100 kHz	1.5 mH @ 100 kHz	2.7 mH @ 1 kHz	4 mH @ 1 kHz	6 mH @ 10 kHz
Current Rating (Max)	5A	5A	5A	6A	6A
DC Resistance (Max)	40mOhm	40mOhm	40mOhm	40mOhm	46mOhm
Voltage Rating - DC	250V	250V	250V	250V	250V
Voltage Rating - AC	250V	250V	250V	250V	250V
Operating Temperature	-40°C ~ 120°C	-40°C ~ 120°C	-40°C ~ 120°C	-40°C ~ 120°C	-40°C ~ 120°C
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Number of Lines	2	2	2	2	2
Filter Type	Power Line	Power Line	Power Line	Power Line	Power Line
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Active	Active	Active	Active	Active

Engineering Selection Recommendations

All substitute parts maintain active product status and ROHS3 compliance, ensuring regulatory alignment with the original SC-05-21J specification. Selection among substitutes depends on circuit inductance requirements and current capacity constraints:

SC-05-15J: Lower inductance value (1.5 mH) with identical 5A current rating and 40mOhm DCR. Suitable for applications requiring reduced filtering inductance while maintaining original current specifications.

SC-05-27J: Higher inductance value (2.7 mH) with identical 5A current rating and 40mOhm DCR. Applicable for circuits requiring increased filtering performance at the expense of higher impedance.

SC-06-40J: Elevated inductance (4 mH) with increased current capacity (6A) and 40mOhm DCR. Appropriate for higher-current applications or circuits demanding greater filtering inductance.

SC22-06-60J: Maximum inductance value (6 mH) with 6A current capacity and 46mOhm DCR. Suitable for applications requiring maximum filtering performance with higher current tolerance and acceptable DCR increase.

Frequently Asked Questions (FAQ)

Q: Can SC-05-15J replace SC-05-21J in all applications? A: SC-05-15J provides lower inductance (1.5 mH versus 2 mH). Substitution is valid only if circuit design tolerates reduced filtering inductance. Current rating, voltage rating, and thermal specifications remain equivalent.

Q: What is the primary difference between SC-05-27J and SC-05-21J? A: SC-05-27J offers higher inductance (2.7 mH) measured at 1 kHz versus 2 mH at 100 kHz for SC-05-21J. Both maintain identical current rating (5A), DCR (40mOhm), and voltage specifications. Frequency-dependent inductance variation reflects measurement conditions.

Q: Is SC-06-40J compatible with SC-05-21J footprints? A: Both components use through-hole mounting with vertical 4-pin configuration. Physical dimensions differ (SC-06-40J: 35.00mm L x 25.00mm W versus SC-05-21J: 34.00mm L x 23.00mm W). PCB layout verification is required to confirm mechanical compatibility.

Q: Why does SC22-06-60J have higher DCR (46mOhm) than other substitutes? A: SC22-06-60J delivers 6 mH inductance with 6A current capacity. The 46mOhm DCR remains within acceptable tolerance for power line filtering applications while supporting the elevated inductance and current specifications.

Q: Are all substitute parts ROHS3 compliant? A: All identified substitutes (SC-05-15J, SC-05-27J, SC-06-40J, SC22-06-60J) maintain ROHS3 compliance and active product status, matching the regulatory requirements of SC-05-21J.

Q: Can SC22-06-60J be used in circuits designed for 5A maximum current? A: SC22-06-60J is rated for 6A maximum current, exceeding the 5A requirement. The component operates safely at 5A. Higher inductance (6 mH) and slightly elevated DCR (46mOhm) must be evaluated for circuit performance impact.

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