440LD47AD-R Equivalent & Substitute Parts

Part Overview

The Vishay Cera-Mite 440LD47AD-R is a 4700 pF ceramic capacitor rated for 760VAC with Y5U temperature coefficient, designed for safety-critical applications. This radial, disc-type capacitor is classified as X1, Y1 rated and operates across -30°C to 125°C. The part is currently active in production with 904 units in stock. Equivalent and substitute parts are identified to support procurement flexibility, inventory management, and supply chain continuity.

Substiute Parts

440LD47AD-R

Vishay Cera-MiteIn Stock: 1014440LD47AD-R Datasheet

Current PartRFQ

C971U472MVWDBA7317

KEMETIn Stock: 7049C971U472MVWDBA7317 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 440LD47AD-R is determined by the following critical parameters:

• Capacitance value: 4700 pF (exact match required)
• Tolerance: ±20% (exact match required)
• Temperature coefficient: Y5U (E) (exact match required)
• Safety ratings: X1, Y1 (exact match required)
• Mounting type: Through Hole, Radial configuration (exact match required)
• RoHS compliance: ROHS3 Compliant (compliance maintained)

The KEMET C971U472MVWDBA7317 qualifies as a substitute based on matching capacitance, tolerance, temperature coefficient, safety ratings, and mounting configuration. The voltage rating differs (400VAC vs. 760VAC), which represents a derating condition acceptable for applications where the lower voltage rating meets circuit requirements.

Parameter Comparison

Engineering Selection Recommendations

Both the 440LD47AD-R and C971U472MVWDBA7317 maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory alignment for safety-critical applications. The primary distinction is the voltage rating differential: the KEMET substitute operates at 400VAC versus the Vishay original at 760VAC. Selection between these parts depends on circuit voltage requirements. The KEMET part is suitable for applications where the 400VAC rating satisfies design specifications. The KEMET substitute offers a lower operating temperature floor (-40°C vs. -30°C), providing extended low-temperature performance. Lead style differs between the parts: the Vishay uses straight leads while the KEMET employs formed, kinked leads, which may affect board layout and insertion considerations.

Frequently Asked Questions (FAQ)

Q: Can the KEMET C971U472MVWDBA7317 replace the Vishay 440LD47AD-R in all applications?

A: Substitution is valid only when the circuit voltage rating is 400VAC or lower. The KEMET part is rated for 400VAC, which is lower than the original 760VAC rating. Verify that your application does not exceed 400VAC before substitution.

Q: Are the physical dimensions compatible between these parts?

A: Both parts use radial, disc packaging with through-hole mounting. The Vishay part measures 0.618" diameter (15.70mm) with 0.374" lead spacing (9.50mm). The KEMET part measures 0.551" diameter (14.00mm) with 0.394" lead spacing (10.00mm). These dimensional differences may require PCB layout verification, particularly for lead spacing.

Q: Do both parts meet safety certification requirements?

A: Yes. Both the 440LD47AD-R and C971U472MVWDBA7317 carry X1, Y1 safety ratings and are suitable for safety-critical applications.

Q: What is the difference in lead configuration?

A: The Vishay 440LD47AD-R features straight leads, while the KEMET C971U472MVWDBA7317 uses formed leads with a kinked profile. This affects insertion into PCB holes and may influence board assembly processes.

Q: Are there temperature range differences?

A: The KEMET substitute extends the lower operating temperature to -40°C compared to the Vishay original at -30°C. Both parts support the upper limit of 125°C. The KEMET part provides broader low-temperature performance.

Q: Do both parts comply with environmental regulations?

A: Yes. Both parts are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory standards for electronic components.