C921U331KYYDBAWL35 Equivalent & Substitute Parts

Part Overview

The C921U331KYYDBAWL35 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

C921U331KYYDBAWL35

KEMETIn Stock: 778C921U331KYYDBAWL35 Datasheet

Current PartRFQ

VY2331K29Y5SS63V0

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

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the C921U331KYYDBAWL35 is determined by the following critical parameters:

Mandatory Matching Criteria:

• Capacitance value: 330 pF
• Tolerance: ±10%
• Temperature coefficient classification: Y5P or Y5S (both acceptable for Y-rated safety applications)
• Safety ratings: X1 and Y2 certification required
• Mounting type: Through Hole
• Package configuration: Radial, Disc with kinked formed leads
• Operating temperature range: -40°C to 125°C minimum

Allowable Variation:

• Voltage rating: Equal to or greater than 400VAC (440VAC is acceptable)
• Physical dimensions: Minor variations permitted within industry standards for radial disc packages
• Lead spacing: 0.394" (10.00mm) standard maintained

The substitute part VY2331K29Y5SS63V0 meets all mandatory criteria with a higher voltage rating (440VAC) and Y5S temperature coefficient, both of which are compatible with the original application requirements.

Parameter Comparison

Engineering Selection Recommendations

The VY2331K29Y5SS63V0 (Vishay Beyschlag/Draloric/BC Components) is a direct functional equivalent for the obsolete C921U331KYYDBAWL35. Selection is supported by the following factors:

Compliance & Certification: Both parts maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory alignment for current manufacturing standards.

Safety Rating Equivalence: Both components carry X1 and Y2 safety certifications, meeting the same safety-rated application requirements.

Electrical Performance: The substitute part's 440VAC rating exceeds the original 400VAC specification, providing additional voltage margin. The Y5S temperature coefficient is functionally equivalent to Y5P within Y-rated safety capacitor classifications, maintaining the same operating temperature range of -40°C to 125°C.

Physical & Mechanical Compatibility: Identical lead spacing (0.394" / 10.00mm), lead style (kinked formed leads), and package configuration (radial disc) ensure direct PCB mounting compatibility without layout modifications.

Inventory & Availability: The substitute part is listed as Active status with 748 units in stock, providing procurement continuity compared to the obsolete original part.

Frequently Asked Questions (FAQ)

Q: Can the VY2331K29Y5SS63V0 be used as a direct replacement without circuit modifications?

A: Yes. The substitute part maintains identical capacitance (330 pF), tolerance (±10%), safety ratings (X1, Y2), operating temperature range (-40°C to 125°C), and physical lead configuration. The higher voltage rating (440VAC vs. 400VAC) and Y5S temperature coefficient are compatible with applications designed for the original part.

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

A: Both Y5P and Y5S are Y-rated safety capacitor classifications with identical operating temperature ranges (-40°C to 125°C). The substitution is valid within safety-rated applications. The specific letter designation (P vs. S) indicates minor variations in capacitance change characteristics across the temperature range, but both meet the same safety and performance standards for this application category.

Q: Does the higher voltage rating (440VAC) of the substitute part affect circuit performance?

A: No. A higher voltage rating does not negatively impact circuit performance. The substitute part will operate safely in circuits designed for 400VAC operation. The increased voltage margin provides additional safety margin without altering electrical behavior at the specified operating voltage.

Q: Are the physical dimensions compatible with the original PCB layout?

A: Yes. Both parts use identical lead spacing (0.394" / 10.00mm) and kinked formed lead style. The substitute part's slightly smaller diameter (7.50mm vs. 9.00mm) and greater height (11.50mm) represent minor dimensional variations typical within radial disc package standards and do not affect PCB mounting compatibility.

Q: What compliance certifications apply to both parts?

A: Both the C921U331KYYDBAWL35 and VY2331K29Y5SS63V0 are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements for electronic component manufacturing and use.