Equivalent & Substitute Parts for 440LD33ED-R

Part Overview

The 440LD33ED-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 substitutes with matching electrical and mechanical specifications are required to maintain circuit functionality and compliance.

Substiute Parts

440LD33ED-R

Vishay Cera-MiteIn Stock: 714440LD33ED-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 440LD33ED-R is determined by strict equivalence across 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 operating temperature range establish the performance envelope within which substitutes must operate.

Two substitute parts are identified:

440LD33-R (Parametric Equivalent): Identical electrical specifications and mechanical configuration to the main part, differing only in packaging format (Bulk versus tape/reel) and product status (Active versus Obsolete).

C951U332MVWDBA7317 (Manufacturer Recommended): Matches capacitance, tolerance, temperature coefficient, and safety ratings. Voltage rating is 400VAC (lower than the 760VAC main part), with modified physical dimensions and formed leads. Operating temperature range extends to -40°C minimum.

Parameter Comparison

Engineering Selection Recommendations

440LD33-R is the primary substitute for 440LD33ED-R. Both parts are manufactured by Vishay Cera-Mite with identical electrical and mechanical specifications. The 440LD33-R maintains Active product status with higher inventory availability (1205 pcs versus 694 pcs), ensuring supply continuity. This substitute requires no circuit redesign or PCB layout modification.

C951U332MVWDBA7317 is a manufacturer-recommended alternative from KEMET. This part maintains electrical equivalence in capacitance, tolerance, and temperature coefficient with full X1, Y1 safety compliance. The 400VAC voltage rating is lower than the 760VAC main part specification; this substitute is suitable only for applications where the circuit voltage requirement does not exceed 400VAC. Physical dimensions differ (0.472" diameter versus 0.429", 0.394" lead spacing versus 0.374"), and lead style is formed rather than straight, requiring PCB layout verification. The extended operating temperature minimum (-40°C) provides additional thermal margin. ROHS3 compliance is maintained.

Selection between 440LD33-R and C951U332MVWDBA7317 depends on circuit voltage requirements and PCB layout constraints. For applications rated at 760VAC, 440LD33-R is the appropriate choice. For applications operating at 400VAC or below with available PCB space for the larger footprint, C951U332MVWDBA7317 provides an alternative source.

Frequently Asked Questions (FAQ)

Q: Can 440LD33-R directly replace 440LD33ED-R without circuit modification?

A: Yes. Both parts are electrically and mechanically identical. The difference is packaging format (Bulk versus tape/reel) and product status. No circuit or PCB changes are required.

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

A: The voltage rating is 400VAC, compared to 760VAC for the main part. This substitute is only suitable for circuits operating at 400VAC or lower. Additionally, the physical footprint is larger (0.472" diameter, 0.394" lead spacing) with formed leads, requiring PCB layout verification.

Q: Are all substitutes ROHS3 compliant?

A: Yes. Both 440LD33-R and C951U332MVWDBA7317 are ROHS3 compliant, matching the main part specification.

Q: Do the substitutes maintain X1, Y1 safety ratings?

A: Yes. Both substitute parts carry X1, Y1 safety ratings, consistent with the main part and suitable for safety-rated applications.

Q: What is the impact of different lead styles on PCB assembly?

A: The 440LD33ED-R and 440LD33-R have straight leads, while C951U332MVWDBA7317 has formed leads (kinked). Formed leads may require different insertion tooling and PCB hole positioning. Lead spacing also differs (0.374" versus 0.394"), necessitating PCB layout verification before substitution.

Q: Which substitute offers the best supply availability?

A: 440LD33-R has 1205 pcs in stock, compared to 694 pcs for the main part and 8033 pcs for C951U332MVWDBA7317. For immediate availability, C951U332MVWDBA7317 offers the highest inventory level.