SFD66S35K491B Equivalent & Substitute Parts

Part Overview

The SFD66S35K491B is a 35 µF film capacitor rated for 660V AC applications, manufactured by Cornell Dubilier Electronics (CDE). This capacitor features polypropylene (PP) metallized construction in a radial, can-style package designed for motor run applications. The product is currently listed as obsolete, necessitating identification of equivalent substitute parts for ongoing system maintenance and repair operations.

Substiute Parts

SFD66S35K491B

Cornell Dubilier Electronics (CDE)In Stock: 779SFD66S35K491B Datasheet

Current PartRFQ

SFD66T35K475B-F

Cornell Dubilier Electronics (CDE)In Stock: 890SFD66T35K475B-F Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution compatibility for the SFD66S35K491B is determined by strict equivalence in the following electrical and mechanical parameters:

Critical Electrical Parameters:

• Capacitance: 35 µF (exact match required)
• Tolerance: ±10% (exact match required)
• Voltage Rating - AC: 660V (minimum requirement)
• Dielectric Material: Polypropylene (PP), Metallized (exact match required)

Critical Mechanical Parameters:

• Package / Case: Radial, Can (exact match required)
• Lead Spacing: 0.810" (20.57mm) (exact match required)
• Size / Dimension: 3.660" L x 1.970" W (92.96mm x 50.04mm), Lip (exact match required)
• Height - Seated (Max): 5.030" (127.76mm) (exact match required)
• Termination: Quick Connect, Disconnect (exact match required)

Environmental Parameters:

• Operating Temperature Range: -40°C to +70°C (minimum requirement)

The substitute part SFD66T35K475B-F meets all electrical and mechanical equivalence criteria, differing only in product status (active versus obsolete) and regulatory compliance certifications.

Parameter Comparison

Engineering Selection Recommendations

The SFD66T35K475B-F is the direct equivalent substitute for the obsolete SFD66S35K491B. Both parts are manufactured by Cornell Dubilier Electronics and meet identical electrical and mechanical specifications for motor run applications requiring 35 µF capacitance at 660V AC.

The primary advantage of selecting the SFD66T35K475B-F is its active product status, ensuring availability for procurement and future supply chain continuity. Additionally, the SFD66T35K475B-F achieves ROHS3 compliance, whereas the original part is RoHS non-compliant. Both parts carry REACH Unaffected status and fall under the same ECCN (EAR99) and HTSUS (8532.25.0030) classifications.

For applications where RoHS compliance is required, the SFD66T35K475B-F is the appropriate selection. For legacy systems where the original obsolete part was specified, direct substitution is electrically and mechanically equivalent.

Frequently Asked Questions (FAQ)

Q: Are the SFD66S35K491B and SFD66T35K475B-F fully interchangeable?

A: Yes. Both parts share identical capacitance (35 µF), tolerance (±10%), voltage rating (660V AC), dielectric material (polypropylene metallized), lead spacing (0.810"), case dimensions (3.660" L x 1.970" W with 5.030" max seated height), and termination type (quick connect/disconnect). They are suitable for direct substitution in motor run applications.

Q: What is the difference between these two parts?

A: The parts differ in product status and regulatory compliance. The SFD66S35K491B is obsolete and RoHS non-compliant, while the SFD66T35K475B-F is an active product achieving ROHS3 compliance. Both parts are manufactured by the same company and carry REACH Unaffected status.

Q: Can the SFD66T35K475B-F be used in existing equipment designed for the SFD66S35K491B?

A: Yes. The SFD66T35K475B-F is mechanically and electrically equivalent. It features the same radial can package, lead spacing, physical dimensions, and electrical characteristics. Direct mounting is possible without circuit or bracket modifications.

Q: What is the packaging difference between these parts?

A: The SFD66S35K491B is supplied with standard packaging, while the SFD66T35K475B-F is supplied in bulk packaging. This is a logistical classification without impact on component performance or compatibility.

Q: Is the operating temperature range the same for both parts?

A: Yes. Both parts operate within the same temperature range of -40°C to +70°C, meeting identical environmental specifications.