SC-18-25J Common Mode Choke Equivalent & Substitute Parts

Part Overview

The SC-18-25J is a 2.5 mH common mode choke manufactured by KEMET, designed for power line filtering applications. This through-hole component operates at 18A maximum current with a DC resistance of 10mOhm and supports dual-line filtering in a vertical 4-pin configuration. The part is Active in product status and fully compliant with ROHS3 and REACH regulations. Substitute parts are identified when equivalent electrical performance can be achieved within the allowed parameter tolerances for this product category while maintaining the same mounting type, voltage ratings, and thermal operating range.

Substiute Parts

SC-18-25J

KEMETIn Stock: 1265SC-18-25J Datasheet

Current PartRFQ

SC-18-E12J

KEMETIn Stock: 839SC-18-E12J Datasheet

Parametric EquivalentRFQ

SC-18-E15J

KEMETIn Stock: 829SC-18-E15J Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SC-18-25J are qualified based on the following criteria:

Fixed Parameters (Must Match Exactly):

• Current Rating: 18A
• Voltage Rating - DC: 250V
• Voltage Rating - AC: 250V
• Operating Temperature Range: -40°C ~ 120°C
• Mounting Type: Through Hole
• Package / Case: Vertical, 4 PC Pin
• Filter Type: Power Line
• Number of Lines: 2
• Series: SC-J
• RoHS Status: ROHS3 Compliant

Variable Parameters (Allowed Substitution Range):

• Inductance @ 10 kHz: 1.2 mH to 2.5 mH
• DC Resistance (Max): 8mOhm to 10mOhm

The SC-18-E15J and SC-18-E12J maintain identical electrical ratings and mechanical specifications while offering reduced inductance values and lower DC resistance characteristics within the SC-J series design envelope.

Parameter Comparison

Engineering Selection Recommendations

All three parts—SC-18-25J, SC-18-E15J, and SC-18-E12J—are Active products manufactured by KEMET within the SC-J series. Each part maintains full ROHS3 compliance and REACH unaffected status, ensuring regulatory alignment for power line filtering applications. Selection between these parts depends on the specific inductance requirement of the application circuit. The SC-18-25J provides maximum inductance at 2.5 mH, while SC-18-E15J and SC-18-E12J offer lower inductance values with correspondingly reduced DC resistance characteristics. All parts share identical current ratings, voltage specifications, thermal operating ranges, and through-hole mounting configurations.

Frequently Asked Questions (FAQ)

Q: Can SC-18-E15J or SC-18-E12J be used as direct replacements for SC-18-25J?

A: Direct replacement depends on circuit inductance requirements. Both substitute parts maintain the same current rating (18A), voltage ratings (250V DC/AC), operating temperature range (-40°C ~ 120°C), and through-hole mounting configuration. However, inductance values differ: SC-18-E15J provides 1.5 mH and SC-18-E12J provides 1.2 mH compared to the SC-18-25J's 2.5 mH. Selection must be based on the application's inductance specification.

Q: Are there physical dimension differences between these parts?

A: SC-18-25J and SC-18-E15J share identical dimensions (1.732" L x 1.181" W, 44.00mm x 30.00mm). SC-18-E12J has larger dimensions (1.969" L x 1.220" W, 50.00mm x 31.00mm). All three maintain the same vertical 4-pin through-hole package configuration and will fit standard PCB layouts designed for the SC-J series.

Q: What is the difference in DC resistance between these parts?

A: SC-18-25J has a maximum DC resistance of 10mOhm, SC-18-E15J has 8mOhm, and SC-18-E12J has 9mOhm. Lower DC resistance reduces power dissipation in the component during operation at rated current levels.

Q: Are all three parts compliant with current regulations?

A: Yes. All three parts are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements for electronic component manufacturing and use.

Q: What inventory levels are available for each part?

A: SC-18-25J has 1,198 pieces in stock, SC-18-E15J has 753 pieces in stock, and SC-18-E12J has 801 pieces in stock, all packaged in trays as new original components.