KEMET SN8D-300 Common Mode Choke Equivalent & Substitute Parts

Part Overview

The KEMET SN8D-300 is a 45 µH @ 100 kHz, 2-line common mode choke designed for power line filtering applications in through-hole mounting configurations. This component operates at a maximum current rating of 2A with a DC resistance of 52 mOhm and functions across an operating temperature range of -25°C to 105°C. The SN8D-300 maintains Active product status and is RoHS3 compliant. Substitute parts are identified when equivalent electrical performance and mechanical compatibility are required due to inventory constraints, design optimization, or application-specific parameter adjustments within the allowed specification range.

Substiute Parts

SN8D-300

KEMETIn Stock: 823SN8D-300 Datasheet

Current PartRFQ

SN5-300

KEMETIn Stock: 1087SN5-300 Datasheet

Parametric EquivalentRFQ

SN5-400

KEMETIn Stock: 2659SN5-400 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SN8D-300 are qualified based on the following criteria:

Mandatory Matching Parameters:

• Manufacturer: KEMET
• Series: SN
• Filter Type: Power Line
• Number of Lines: 2
• Current Rating (Max): 2A
• Operating Temperature: -25°C ~ 105°C
• Mounting Type: Through Hole
• Package / Case: Vertical, No Base, 2 PC Pin
• Product Status: Active
• RoHS Status: ROHS3 Compliant
• REACH Status: REACH Unaffected

Variable Parameters (Allowed Substitution Range):

• Inductance @ Frequency: 25 µH to 48 µH @ 100 kHz
• DC Resistance (DCR) (Max): 42 mOhm to 58 mOhm

The SN5-300 and SN5-400 are qualified substitutes because they maintain identical electrical performance characteristics in terms of current handling, temperature range, and filtering application, while offering inductance values within the acceptable operating range for common mode choke applications. Variations in inductance and DCR reflect different core configurations within the same product family, each suitable for specific circuit requirements.

Parameter Comparison

Engineering Selection Recommendations

SN5-300 Selection Criteria: The SN5-300 offers a lower inductance value of 25 µH @ 100 kHz with reduced DC resistance of 42 mOhm. This substitute is suitable for applications requiring lower impedance characteristics while maintaining the 2A current capacity. The reduced height of 0.571" (14.50mm) compared to the SN8D-300 at 0.689" (17.50mm) provides space optimization benefits in compact board layouts. Both parts maintain Active product status and full RoHS3 compliance.

SN5-400 Selection Criteria: The SN5-400 provides inductance of 48 µH @ 100 kHz, closely matching the SN8D-300 specification at 45 µH, with a slightly elevated DC resistance of 58 mOhm. This substitute delivers near-equivalent filtering performance with minimal inductance deviation. The SN5-400 also features the reduced height profile of 0.571" (14.50mm). Both parts maintain Active product status and full RoHS3 compliance.

All substitute parts are manufactured by KEMET, maintain identical electrical ratings for current and temperature operation, and are suitable for direct PCB mounting in through-hole applications without design modification.

Frequently Asked Questions (FAQ)

Q: Can the SN5-300 replace the SN8D-300 in all applications? A: The SN5-300 is electrically compatible for 2A, 2-line common mode choke applications. The inductance difference of 20 µH (25 µH versus 45 µH) and lower DCR of 42 mOhm require circuit-level evaluation to confirm filtering performance meets application requirements. Both parts share identical current ratings, temperature ranges, and mounting specifications.

Q: What is the primary difference between the SN5-400 and SN8D-300? A: The SN5-400 provides 48 µH @ 100 kHz inductance compared to the SN8D-300 at 45 µH, representing a 3 µH difference. DC resistance increases from 52 mOhm to 58 mOhm. Physical height reduces from 0.689" to 0.571". All other electrical and compliance parameters remain identical.

Q: Are all substitute parts through-hole mounted? A: Yes. The SN8D-300, SN5-300, and SN5-400 all feature through-hole mounting with vertical orientation, no base, and 2 PC pin configuration. Direct PCB mounting compatibility is maintained across all three parts.

Q: Do substitute parts maintain RoHS3 compliance? A: Yes. Both the SN5-300 and SN5-400 are RoHS3 compliant and REACH unaffected, matching the compliance status of the SN8D-300. All parts are suitable for applications requiring environmental regulatory adherence.

Q: What is the impact of DCR variation on circuit performance? A: DC resistance variation ranges from 42 mOhm (SN5-300) to 58 mOhm (SN5-400) compared to 52 mOhm (SN8D-300). Lower DCR reduces power dissipation and heat generation; higher DCR increases dissipation. Circuit thermal and efficiency analysis determines acceptable DCR range for specific applications.

Q: Can these parts be used interchangeably on the same PCB? A: Physical compatibility exists due to identical through-hole mounting specifications and package configuration. Electrical interchangeability depends on circuit tolerance to inductance and DCR variations. Design verification is required to confirm performance equivalence for specific filtering applications.