C921U331KYYDBAWL40 Equivalent & Substitute Parts

Part Overview

The C921U331KYYDBAWL40 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 classifications, with through-hole radial mounting configuration.

Substiute Parts

C921U331KYYDBAWL40

KEMETIn Stock: 898C921U331KYYDBAWL40 Datasheet

Current PartRFQ

VY2331K29Y5SS63V0

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

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the C921U331KYYDBAWL40 is determined by strict equivalence in the following parameters:

Critical Matching Parameters:

• Capacitance value: 330 pF
• Tolerance: ±10%
• Temperature coefficient classification: Y5P or Y5S (both acceptable for Y-rated safety applications)
• Voltage rating: Equal to or greater than 400VAC
• Safety ratings: X1 and Y2 compliance required
• Operating temperature range: -40°C ~ 125°C minimum
• Mounting configuration: Through-hole radial with 10.00mm lead spacing
• Regulatory compliance: ROHS3 and REACH status maintained

The VY2331K29Y5SS63V0 from Vishay Beyschlag/Draloric/BC Components meets all critical substitution criteria. The voltage rating increase from 400VAC to 440VAC represents an uprating that maintains functional compatibility. The temperature coefficient variation from Y5P to Y5S remains within acceptable Y-rated safety classification parameters.

Parameter Comparison

Engineering Selection Recommendations

The VY2331K29Y5SS63V0 is a direct functional substitute for the obsolete C921U331KYYDBAWL40. Selection is based on the following engineering criteria:

Regulatory Compliance: Both components maintain ROHS3 compliance and REACH unaffected status, ensuring continued regulatory adherence in safety-critical applications.

Safety Classification: Both parts carry X1 and Y2 safety ratings, meeting the requirements for applications where these classifications are mandated.

Electrical Equivalence: Identical capacitance (330 pF) and tolerance (±10%) ensure circuit performance equivalence. The voltage rating increase from 400VAC to 440VAC provides additional design margin without introducing incompatibility.

Temperature Performance: Matching operating temperature range (-40°C ~ 125°C) ensures thermal performance equivalence across specified environmental conditions.

Physical Compatibility: Identical lead spacing (10.00mm) and through-hole radial configuration enable direct PCB footprint compatibility without layout modification.

Product Status: The substitute part is active in production, ensuring long-term availability and supply chain continuity.

Frequently Asked Questions (FAQ)

Q: Can the VY2331K29Y5SS63V0 be used as a direct replacement without PCB modification?

A: Yes. The VY2331K29Y5SS63V0 maintains identical lead spacing (10.00mm) and radial disc package configuration, enabling direct substitution on existing PCB layouts without modification.

Q: What is the significance of the voltage rating difference (400VAC vs. 440VAC)?

A: The 440VAC rating on the substitute part represents an uprating relative to the original 400VAC specification. This provides additional voltage margin and is functionally compatible with circuits designed for 400VAC operation.

Q: Are the Y5P and Y5S temperature coefficients interchangeable?

A: Both Y5P and Y5S are classified as Y-rated temperature coefficients for safety applications. The variation between these designations falls within acceptable Y-rated safety classification parameters and does not affect functional compatibility in the specified application.

Q: Does the substitute part maintain the same safety certifications?

A: Yes. The VY2331K29Y5SS63V0 carries identical X1 and Y2 safety ratings, maintaining compliance with safety-critical application requirements.

Q: What is the physical size difference between these components?

A: The main part has a diameter of 0.354" (9.00mm), while the substitute has a diameter of 0.295" (7.50mm). Despite this dimensional difference, both components share identical lead spacing and through-hole configuration, ensuring PCB compatibility.

Q: Are both components RoHS compliant?

A: Yes. Both the C921U331KYYDBAWL40 and VY2331K29Y5SS63V0 are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements.