Vishay Cera-Mite 440LD33-R Equivalent & Substitute Parts

Part Overview

The Vishay Cera-Mite 440LD33-R is a 3300 pF ceramic capacitor rated for 760VAC with Y5U temperature coefficient, designed for safety-critical applications requiring X1 and Y1 ratings. This component is currently active in production with 1205 units in stock. Equivalent and substitute parts may be required due to inventory constraints, lead time considerations, or specific application requirements within the allowed electrical and mechanical parameter ranges.

Substiute Parts

440LD33-R

Vishay Cera-MiteIn Stock: 1247440LD33-R Datasheet

Current PartRFQ

C951U332MVWDBA7317

KEMETIn Stock: 8067C951U332MVWDBA7317 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the 440LD33-R is determined by the following critical parameters:

• Capacitance Value: Must be 3300 pF
• Tolerance: Must be ±20%
• Temperature Coefficient: Must be Y5U (E)
• Safety Ratings: Must include X1 and Y1 designations
• Mounting Configuration: Must be Through Hole with Radial, Disc package
• Compliance: Must maintain ROHS3 and REACH Unaffected status

The KEMET C951U332MVWDBA7317 qualifies as a substitute based on matching capacitance, tolerance, temperature coefficient, safety ratings, mounting type, and package configuration. The voltage rating difference (400VAC vs. 760VAC) represents a derating condition and must be evaluated against specific circuit requirements.

Parameter Comparison

Engineering Selection Recommendations

The KEMET C951U332MVWDBA7317 is qualified as a substitute for the Vishay 440LD33-R based on electrical equivalence in capacitance, tolerance, temperature coefficient, and safety ratings. Both components maintain ROHS3 compliance and REACH Unaffected status, meeting regulatory requirements for safety-critical applications.

The primary design consideration is the voltage rating differential: the KEMET substitute is rated for 400VAC compared to the original 760VAC specification. Circuit voltage requirements must be evaluated to determine if this derating is acceptable for the intended application. The KEMET component features kinked formed leads versus straight leads on the Vishay part, which may affect PCB layout and insertion force characteristics.

The KEMET component is available in Cut Tape packaging, whereas the Vishay original is supplied in Bulk format. Packaging format selection depends on assembly process requirements and inventory management practices.

Frequently Asked Questions (FAQ)

Q: Can the KEMET C951U332MVWDBA7317 be used in place of the Vishay 440LD33-R in all applications?

A: Electrical substitution is valid for applications operating at or below 400VAC. Applications requiring the full 760VAC rating of the original part cannot use this substitute without circuit redesign or voltage derating analysis.

Q: What is the significance of the lead style difference (Straight vs. Kinked)?

A: Lead style affects insertion force during PCB assembly and mechanical stress on solder joints. Kinked leads may require different insertion tooling or handling procedures. Verify compatibility with your assembly equipment specifications.

Q: Are both parts suitable for safety-critical applications?

A: Yes. Both components carry X1 and Y1 safety ratings and maintain ROHS3 compliance and REACH Unaffected status, qualifying them for safety-critical circuit applications within their respective voltage ratings.

Q: Does the operating temperature range difference affect substitution?

A: The KEMET component has a lower minimum operating temperature (-40°C vs. -30°C), providing extended low-temperature performance. This represents an improvement over the original specification and does not restrict substitution.

Q: What packaging considerations apply to this substitution?

A: The Vishay part is supplied in Bulk packaging, while the KEMET substitute uses Cut Tape format. Confirm that your procurement and assembly processes support Cut Tape delivery and handling.