SN8S-400JB Common Mode Choke Equivalent & Substitute Parts

Part Overview

The SN8S-400JB is a 46 µH Common Mode Choke (CMC) manufactured by KEMET, designed for power line filtering applications. This through-hole component operates at 2A maximum current with 70mOhm DC resistance and is rated for -25°C to 105°C operating temperature. The part maintains Active product status with full RoHS3 compliance and REACH unaffected designation. Substitute parts are identified when inventory constraints, lead time requirements, or design flexibility necessitate alternative components that maintain equivalent electrical and mechanical performance within specified parameters.

Substiute Parts

SN8S-400JB

KEMETIn Stock: 983SN8S-400JB Datasheet

Current PartRFQ

SN8D-300JB

KEMETIn Stock: 889SN8D-300JB Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SN8S-400JB is determined by strict equivalence across the following critical parameters:

Mandatory Matching Parameters:

• Current Rating (Maximum): 2A
• DC Resistance (Maximum): 70mOhm
• Number of Lines: 2
• Mounting Type: Through Hole
• Operating Temperature Range: -25°C to 105°C
• Package / Case: Horizontal, 4 PC Pin
• RoHS Status: ROHS3 Compliant

Allowable Variance:

• Inductance @ 100 kHz: ±2.2% (45–47 µH range acceptable)

The SN8D-300JB qualifies as a parametric equivalent substitute because it maintains all mandatory matching parameters and operates within the allowable inductance variance band (45 µH vs. 46 µH nominal).

Parameter Comparison

Engineering Selection Recommendations

Both the SN8S-400JB and SN8D-300JB are Active products manufactured by KEMET with identical RoHS3 compliance and REACH unaffected status. Selection between these parts is based on:

Availability and Lead Time: The SN8S-400JB maintains 964 pieces in stock, while the SN8D-300JB maintains 819 pieces in stock. Either part may be selected based on procurement timeline and inventory requirements.

Electrical Performance: The 1 µH inductance difference (46 µH vs. 45 µH) represents a 2.2% variance, which falls within standard engineering tolerance for common mode choke applications. Both parts deliver identical current handling (2A), DC resistance (70mOhm), and thermal performance (-25°C to 105°C).

Mechanical Compatibility: Both parts are identical in mounting configuration (through-hole), package type (horizontal, 4 PC pin), and physical dimensions (0.854" maximum height). Direct board-level substitution is supported without layout modification.

Regulatory Compliance: Both parts maintain equivalent compliance certifications (ROHS3, REACH unaffected, EAR99 ECCN classification, 8504.50.8000 HTSUS code).

Frequently Asked Questions (FAQ)

Q: Can the SN8D-300JB replace the SN8S-400JB in production designs?

A: Yes. The SN8D-300JB is a parametric equivalent substitute. It maintains identical current rating (2A), DC resistance (70mOhm), mounting type (through-hole), package configuration (horizontal, 4 PC pin), and operating temperature range (-25°C to 105°C). The inductance variance of 1 µH (45 µH vs. 46 µH) is within acceptable tolerance for common mode choke applications.

Q: Are there any physical differences between these parts?

A: No. Both parts share identical maximum height (0.854" / 21.70mm), package type (horizontal, 4 PC pin), and mounting footprint. Direct board-level substitution requires no layout changes.

Q: Do both parts meet the same compliance requirements?

A: Yes. Both the SN8S-400JB and SN8D-300JB are ROHS3 compliant, REACH unaffected, and carry identical ECCN (EAR99) and HTSUS (8504.50.8000) classifications.

Q: What is the inductance tolerance between these parts?

A: The SN8D-300JB operates at 45 µH compared to the SN8S-400JB at 46 µH, representing a 2.2% variance. This difference is within standard engineering tolerance for common mode choke filtering applications.

Q: Are both parts currently in production?

A: Yes. Both parts maintain Active product status with KEMET. The SN8S-400JB has 964 pieces in stock, and the SN8D-300JB has 819 pieces in stock.

Q: Can I use either part interchangeably in my circuit?

A: Yes, provided your circuit design accommodates the specified inductance range (45–47 µH). Both parts deliver identical electrical performance across current rating, DC resistance, and thermal operating range.