C921U331KYYDBAWL45 Equivalent & Substitute Parts

Part Overview

The C921U331KYYDBAWL45 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. The part is designed for safety-rated applications with X1 and Y2 ratings, operating across a temperature range of -40°C to 125°C in through-hole radial disc configuration.

Substiute Parts

C921U331KYYDBAWL45

KEMETIn Stock: 977C921U331KYYDBAWL45 Datasheet

Current PartRFQ

VY2331K29Y5SS63V0

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

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the C921U331KYYDBAWL45 is determined by the following critical parameters:

Mandatory Matching Criteria:

• Capacitance value: 330 pF
• Tolerance: ±10%
• Safety ratings: X1, Y2
• Mounting type: Through Hole
• Package configuration: Radial, Disc
• Lead spacing: 0.394" (10.00mm)
• 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 Y-rated safety applications)
• Physical dimensions: Minor variations permitted within industry standards for radial disc packages

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

The VY2331K29Y5SS63V0 from Vishay Beyschlag/Draloric/BC Components is a qualified substitute for the obsolete C921U331KYYDBAWL45. Selection is based on the following engineering factors:

Compliance & Regulatory: Both parts maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory continuity in applications subject to environmental directives.

Electrical Equivalence: Identical capacitance (330 pF) and tolerance (±10%) ensure circuit performance parity. The higher voltage rating (440VAC versus 400VAC) provides additional safety margin without affecting circuit operation.

Safety Certification: Both components carry X1 and Y2 safety ratings, maintaining the same safety classification for mains-connected applications.

Thermal Performance: Identical operating temperature range (-40°C to 125°C) and compatible temperature coefficients (Y5P and Y5S) ensure thermal stability across the specified operating envelope.

Physical Integration: Identical lead spacing (10.00mm) and through-hole mounting configuration enable direct PCB layout compatibility. The smaller physical diameter of the substitute (7.50mm versus 9.00mm) provides improved board space utilization without requiring design modification.

Product Status: The substitute part maintains active product status, ensuring long-term availability and supply chain stability compared to the obsolete original component.

Frequently Asked Questions (FAQ)

Q: Can VY2331K29Y5SS63V0 be used as a direct replacement for C921U331KYYDBAWL45 on existing PCBs?

A: Yes. Both components share identical lead spacing (10.00mm), mounting type (through-hole), and package configuration (radial disc). The smaller physical diameter of the substitute does not affect electrical performance or mechanical fit. No PCB redesign is required.

Q: What is the significance of the different temperature coefficients (Y5P versus Y5S)?

A: Both Y5P and Y5S are Y-rated temperature coefficients for safety-class capacitors. The difference represents minor variations in capacitance change across the operating temperature range, both acceptable for Y2-rated mains applications. The substitute's Y5S coefficient maintains compliance with safety standards.

Q: Why is the substitute part rated for 440VAC when the original is 400VAC?

A: Higher voltage ratings provide additional safety margin and do not compromise circuit operation. A 440VAC-rated capacitor functions correctly in 400VAC applications. This represents an improvement in component robustness without introducing incompatibility.

Q: Are there any inventory or lead time considerations?

A: The substitute part (VY2331K29Y5SS63V0) is listed as active product status with 748 units in stock, compared to the obsolete original. This ensures reliable procurement for ongoing production and repair requirements.

Q: What compliance certifications apply to both parts?

A: Both components are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements for electronic components in EU and global markets.

Q: Is the smaller physical size of the substitute a concern?

A: No. The reduced diameter (7.50mm versus 9.00mm) represents a design improvement, reducing PCB footprint without affecting electrical performance or safety ratings. This may provide layout advantages in space-constrained applications.