440LD47-R Equivalent & Substitute Parts

Part Overview

The Vishay Cera-Mite 440LD47-R is a 4700 pF ceramic capacitor rated for 760VAC with Y5U temperature coefficient, designed for safety-critical applications. This radial, disc-type component is classified as an X1, Y1 safety-rated capacitor and is currently in active production status. Alternative parts may be required due to inventory constraints, application-specific voltage requirements, or lead form preferences in manufacturing environments.

Substiute Parts

440LD47-R

Vishay Cera-MiteIn Stock: 1006440LD47-R Datasheet

Current PartRFQ

C971U472MVWDBA7317

KEMETIn Stock: 7049C971U472MVWDBA7317 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 440LD47-R is determined by the following critical parameters:

• Capacitance Value: Must be 4700 pF
• Tolerance: Must be ±20%
• Temperature Coefficient: Must be Y5U (E)
• Safety Ratings: Must maintain X1, Y1 classification
• Mounting Type: Must be Through Hole
• Package Type: Must be Radial, Disc
• Voltage Rating: Must be equal to or greater than 760VAC for direct substitution in the same circuit

The KEMET C971U472MVWDBA7317 meets all core electrical and mechanical parameters but operates at a reduced voltage rating of 400VAC. This part is suitable only for applications where the circuit voltage does not exceed 400VAC.

Parameter Comparison

Engineering Selection Recommendations

The KEMET C971U472MVWDBA7317 is a valid substitute for the Vishay 440LD47-R when circuit voltage requirements do not exceed 400VAC. Both components are ROHS3 compliant, REACH unaffected, and maintain identical safety ratings (X1, Y1) required for safety-critical applications.

The primary consideration is voltage derating: the substitute part operates at 400VAC maximum, compared to the original 760VAC rating. Applications designed for 760VAC operation require the original Vishay part or an alternative rated for 760VAC or higher.

Secondary considerations include lead form differences (straight versus kinked formed leads) and physical dimensions, which may affect PCB layout and automated assembly processes. The KEMET part features a slightly smaller diameter (14.00mm versus 15.70mm) and different lead spacing (10.00mm versus 9.50mm).

Frequently Asked Questions (FAQ)

Q: Can the KEMET C971U472MVWDBA7317 replace the Vishay 440LD47-R in all applications?

A: No. The substitute part is rated for 400VAC maximum, while the original is rated for 760VAC. Use the KEMET part only in circuits operating at 400VAC or below.

Q: Are the physical dimensions compatible?

A: The parts differ in diameter (14.00mm versus 15.70mm) and lead spacing (10.00mm versus 9.50mm). Verify PCB footprint compatibility before substitution.

Q: Do both parts meet safety requirements?

A: Yes. Both components carry X1, Y1 safety ratings and are ROHS3 compliant, suitable for safety-critical applications within their respective voltage ratings.

Q: What is the difference between straight and kinked leads?

A: Straight leads (440LD47-R) insert vertically into PCB holes. Kinked formed leads (C971U472MVWDBA7317) are pre-bent for specific mounting angles. Lead form affects insertion tooling and assembly compatibility.

Q: Can I use the substitute in a 760VAC circuit?

A: No. Using a 400VAC-rated component in a 760VAC circuit violates voltage derating requirements and creates a safety hazard.