Equivalent & Substitute Parts for 440LD33AD-R

Part Overview

The 440LD33AD-R is a 3300 pF ceramic capacitor rated for 760VAC with Y5U temperature coefficient, manufactured by Vishay Cera-Mite. This component is classified as obsolete, necessitating identification of equivalent alternatives for ongoing applications. The part is designed for safety-rated applications with X1, Y1 ratings and operates across a temperature range of -30°C to 125°C. Due to its obsolete status, equivalent and substitute parts must be evaluated to maintain supply continuity for systems requiring this capacitance and voltage specification.

Substiute Parts

440LD33AD-R

Vishay Cera-MiteIn Stock: 734440LD33AD-R Datasheet

Current PartRFQ

440LD33-R

Vishay Cera-MiteIn Stock: 1247440LD33-R Datasheet

Parametric EquivalentRFQ

C951U332MVWDBA7317

KEMETIn Stock: 8067C951U332MVWDBA7317 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the 440LD33AD-R is determined by the following critical parameters: capacitance value (3300 pF), tolerance (±20%), temperature coefficient (Y5U), safety ratings (X1, Y1), mounting type (Through Hole), and package configuration (Radial, Disc). The voltage rating and physical dimensions are secondary considerations that may vary within acceptable limits for the application.

Two substitute parts have been identified:

440LD33-R (Parametric Equivalent): Identical electrical specifications to the main part with matching capacitance, voltage rating (760VAC), tolerance, and temperature coefficient. The primary difference is packaging format (Bulk versus standard packaging) and product status (Active versus Obsolete).

C951U332MVWDBA7317 (Manufacturer Recommended): Matches the core electrical parameters of capacitance (3300 pF), tolerance (±20%), and temperature coefficient (Y5U). However, the voltage rating is reduced to 400VAC, and physical dimensions differ slightly. This part is recommended by the original manufacturer and carries Active product status.

Parameter Comparison

Engineering Selection Recommendations

440LD33-R is the primary equivalent substitute for the 440LD33AD-R. This part maintains identical electrical specifications, physical dimensions, and safety certifications while offering Active product status and improved availability (1205 pcs in stock versus 688 pcs for the main part). The only distinction is packaging format. This substitute is suitable for direct replacement in all applications where the original part was specified.

C951U332MVWDBA7317 is the manufacturer-recommended alternative from KEMET. While it maintains matching capacitance, tolerance, temperature coefficient, and safety ratings, the voltage rating is reduced from 760VAC to 400VAC. This part is suitable only for applications where the circuit operates at or below 400VAC. The physical dimensions are slightly larger (0.472" diameter versus 0.429"), and lead spacing differs (0.394" versus 0.374"), requiring PCB layout verification. The formed, kinked lead style differs from the straight leads of the original part. This substitute offers the advantage of higher inventory availability (8033 pcs in stock) and Active product status from a major capacitor manufacturer.

Both substitutes maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory alignment with the original component.

Frequently Asked Questions (FAQ)

Q: Can 440LD33-R be used as a direct replacement for 440LD33AD-R?

A: Yes. The 440LD33-R is a parametric equivalent with identical electrical specifications, voltage rating, temperature coefficient, safety ratings, and physical dimensions. The only difference is packaging format (Bulk). This part is suitable for direct substitution.

Q: What is the key limitation of C951U332MVWDBA7317 as a substitute?

A: The voltage rating is reduced to 400VAC compared to the original 760VAC specification. This substitute is only suitable for applications operating at or below 400VAC. Additionally, physical dimensions and lead style differ, requiring PCB layout verification before implementation.

Q: Are there any compliance concerns with using the substitute parts?

A: No. Both substitute parts maintain ROHS3 compliance and REACH unaffected status, matching the regulatory profile of the original 440LD33AD-R.

Q: How do the physical dimensions of C951U332MVWDBA7317 compare to the original part?

A: The KEMET part has a larger diameter (0.472" versus 0.429") and different lead spacing (0.394" versus 0.374"). The lead style is also different (formed, kinked leads versus straight leads). PCB layout must be verified for compatibility.

Q: Which substitute should be selected for new designs?

A: For applications requiring 760VAC rating and straight leads, select 440LD33-R. For applications operating at 400VAC or below where physical dimension variations are acceptable, C951U332MVWDBA7317 offers higher inventory availability and manufacturer support from KEMET.

Q: What is the temperature operating range for each substitute?

A: The 440LD33-R maintains the original range of -30°C to 125°C. The C951U332MVWDBA7317 extends the lower limit to -40°C, providing a wider operating temperature range.