KEMET SN8S-400 Common Mode Choke Equivalent & Substitute Parts

Part Overview

The KEMET SN8S-400 is a through-hole mounted common mode choke (CMC) designed for power line filtering applications. This 2-line choke delivers 46 µH inductance at 100 kHz with a maximum current rating of 2A and operates across the temperature range of -25°C to 105°C. The part is currently active in production status and maintains full RoHS3 compliance. Substitute parts are identified when inventory constraints, lead time requirements, or specific application parameters necessitate alternative component selection within the same electrical and mechanical compatibility envelope.

Key Parameters

Parameter	Value	Unit
Manufacturer Part Number	SN8S-400	—
Manufacturer	KEMET	—
Series	SN	—
Filter Type	Power Line	—
Number of Lines	2	—
Inductance @ 100 kHz	46	µH
Current Rating (Max)	2	A
DC Resistance (Max)	52	mOhm
Operating Temperature Range	-25 to 105	°C
Mounting Type	Through Hole	—
Height (Max)	17.50	mm
Package / Case	Vertical, No Base, 2 PC Pin	—
Product Status	Active	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitute parts for the SN8S-400 are qualified based on the following criteria:

Primary Compatibility Parameters:

Number of Lines: 2 (fixed requirement)
Current Rating (Max): 2A (fixed requirement)
Mounting Type: Through Hole (fixed requirement)
Filter Type: Power Line (fixed requirement)
Operating Temperature Range: -25°C to 105°C (fixed requirement)
RoHS3 Compliance: Required
Manufacturer: KEMET (same manufacturer ecosystem)

Variable Parameters Allowing Substitution:

Inductance @ 100 kHz: Range 25–48 µH
DC Resistance (Max): Range 42–58 mOhm
Height (Max): Range 14.50–17.50 mm
Package dimensions within vertical, no-base, 2-pin configuration

All substitute parts maintain identical electrical performance class, thermal rating, and regulatory compliance. Substitution is valid when the application circuit tolerates the specified inductance and DCR variations within the qualified range.

Parameter Comparison

Parameter	SN8S-400 (Main)	SN8D-300	SN5-400	SN5-300
Inductance @ 100 kHz (µH)	46	45	48	25
Current Rating (Max) (A)	2	2	2	2
DC Resistance (Max) (mOhm)	52	52	58	42
Operating Temperature (°C)	-25 to 105	-25 to 105	-25 to 105	-25 to 105
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
Height (Max) (mm)	17.50	17.50	14.50	14.50
Number of Lines	2	2	2	2
Filter Type	Power Line	Power Line	Power Line	Power Line
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Active	Active	Active	Active

Engineering Selection Recommendations

SN8D-300 (Closest Electrical Match) The SN8D-300 provides 45 µH inductance and 52 mOhm DCR, representing a 2.2% inductance deviation and identical DCR from the SN8S-400. Both parts share the same maximum height of 17.50 mm. This substitute is suitable for applications where inductance tolerance is ±5% or greater. Product status is Active with full RoHS3 compliance.

SN5-400 (Highest Inductance Alternative) The SN5-400 delivers 48 µH inductance with 58 mOhm DCR, representing a 4.3% inductance increase and 11.5% DCR increase. Height is reduced to 14.50 mm, enabling use in space-constrained PCB layouts. This substitute is applicable when circuit design accommodates higher DCR and inductance values. Product status is Active with full RoHS3 compliance.

SN5-300 (Lowest Inductance Alternative) The SN5-300 provides 25 µH inductance with 42 mOhm DCR, representing a 45.7% inductance reduction and 19.2% DCR reduction. Height is 14.50 mm. This substitute is limited to applications requiring lower inductance filtering or where reduced DCR is beneficial. Product status is Active with full RoHS3 compliance.

All substitute parts are manufactured by KEMET, maintain identical 2-line configuration, 2A current rating, through-hole mounting, and -25°C to 105°C operating temperature range.

Frequently Asked Questions (FAQ)

Q: Can SN5-300 replace SN8S-400 in any application? A: SN5-300 is electrically compatible only in applications where 25 µH inductance is acceptable. The 45.7% inductance reduction makes this substitute unsuitable for circuits designed around 46 µH filtering characteristics. Verify circuit inductance requirements before selection.

Q: What is the primary difference between SN8D-300 and SN8S-400? A: Both parts share identical height (17.50 mm), current rating (2A), DCR (52 mOhm), and operating temperature range. SN8D-300 inductance is 45 µH versus 46 µH in SN8S-400, a 2.2% difference. The parts belong to different base series (SN8D versus SN8S) but maintain equivalent electrical performance.

Q: Does PCB layout change when substituting with SN5-400 or SN5-300? A: Yes. SN5-series parts have maximum height of 14.50 mm compared to 17.50 mm for SN8S-400 and SN8D-300. Vertical clearance requirements may be reduced, but horizontal footprint remains consistent with the 2-pin through-hole package configuration.

Q: Are all substitute parts RoHS3 compliant? A: Yes. SN8D-300, SN5-400, and SN5-300 are all ROHS3 Compliant with identical REACH Unaffected status and EAR99 ECCN classification as the main part.

Q: Which substitute has the lowest DC resistance? A: SN5-300 has the lowest DCR at 42 mOhm, representing a 19.2% reduction from SN8S-400. SN8D-300 matches the main part at 52 mOhm. SN5-400 has the highest DCR at 58 mOhm.

Q: Can I use SN5-400 if my circuit requires exactly 46 µH? A: SN5-400 provides 48 µH, a 4.3% increase. Substitution is valid only if circuit design tolerates this inductance variation. Verify filter performance and impedance matching requirements before implementation.

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