C921U331KYYDBAWL20 Equivalent & Substitute Parts

Part Overview

The C921U331KYYDBAWL20 is a 330 pF ceramic capacitor rated for 400VAC with Y5P temperature coefficient, manufactured by KEMET. This component is classified as obsolete, necessitating identification of functionally equivalent alternatives for ongoing design support and procurement continuity. The part is designed for safety-rated applications requiring X1 and Y2 certification across an operating temperature range of -40°C to 125°C.

Substiute Parts

C921U331KYYDBAWL20

KEMETIn Stock: 861C921U331KYYDBAWL20 Datasheet

Current PartRFQ

VY2331K29Y5SS63V0

Vishay Beyschlag/Draloric/BC ComponentsIn Stock: 796VY2331K29Y5SS63V0 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the C921U331KYYDBAWL20 is determined by the following critical parameters:

Mandatory Matching Criteria:

• Capacitance value: 330 pF
• Tolerance: ±10%
• Safety ratings: X1, Y2 certification
• Mounting type: Through Hole
• Package configuration: Radial, Disc with kinked formed leads
• Operating temperature range: -40°C to 125°C minimum
• RoHS3 compliance

Allowable Variation:

• Voltage rating: Equal to or greater than 400VAC
• Temperature coefficient: Y5P or Y5S (both acceptable for this application class)
• Physical dimensions: Minor variations permitted within standard radial disc envelope constraints

The substitute part VY2331K29Y5SS63V0 meets all mandatory criteria with a higher voltage rating (440VAC) and compatible temperature coefficient (Y5S), making it a valid functional equivalent.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute: VY2331K29Y5SS63V0

The Vishay Beyschlag/Draloric/BC Components part VY2331K29Y5SS63V0 is a direct functional equivalent for the obsolete KEMET C921U331KYYDBAWL20. Selection rationale:

• Capacitance and Tolerance: Identical 330 pF ±10% specification ensures circuit performance equivalence
• Voltage Rating: The 440VAC rating exceeds the original 400VAC requirement, providing additional safety margin
• Safety Certification: Both X1 and Y2 ratings are maintained, preserving compliance for safety-critical applications
• Temperature Performance: Y5S temperature coefficient operates within the same -40°C to 125°C range as the original Y5P specification
• Regulatory Compliance: ROHS3 compliance and REACH unaffected status match the original part
• Physical Compatibility: Identical lead spacing (0.394" / 10.00mm) and kinked lead style ensure PCB footprint compatibility; smaller diameter (7.50mm vs 9.00mm) provides layout flexibility
• Product Status: Active manufacturing status ensures long-term availability and supply chain stability

The substitute part is suitable for direct replacement in existing designs without circuit modification.

Frequently Asked Questions (FAQ)

Q: Can VY2331K29Y5SS63V0 be used as a direct replacement for C921U331KYYDBAWL20?

A: Yes. Both parts share identical capacitance (330 pF), tolerance (±10%), safety ratings (X1, Y2), operating temperature range (-40°C to 125°C), lead spacing (10.00mm), and mounting configuration. The substitute has a higher voltage rating (440VAC vs 400VAC) and compatible temperature coefficient (Y5S vs Y5P), both of which are acceptable variations for this application class.

Q: What is the significance of the Y5P versus Y5S temperature coefficient difference?

A: Both Y5P and Y5S are Class Y ceramic capacitor temperature coefficients within the same performance envelope for safety-rated applications. The Y5S specification of the substitute part is functionally compatible with the original Y5P requirement across the specified operating temperature range.

Q: Will the smaller physical diameter of the substitute part affect PCB layout?

A: No. The critical parameter for PCB compatibility is lead spacing, which is identical at 0.394" (10.00mm) for both parts. The smaller diameter (7.50mm vs 9.00mm) of the substitute part actually provides additional layout flexibility without affecting electrical performance or mechanical fit.

Q: Are both parts compliant with current regulatory requirements?

A: Yes. Both the original KEMET part and the Vishay substitute are ROHS3 compliant and REACH unaffected, meeting current environmental and safety regulations.

Q: Why is the original KEMET part listed as obsolete?

A: Product obsolescence is determined by manufacturer discontinuation. The Vishay substitute maintains equivalent electrical and safety specifications while offering active manufacturing status and assured supply chain availability.