CD17FD121JO3 Equivalent & Substitute Parts

Part Overview

The CD17FD121JO3 is a 120 pF mica capacitor rated for 500 V operation in a radial through-hole package, manufactured by Cornell Dubilier Electronics (CDE). This component is classified as Active product status and is designed for RF applications requiring high Q factor and low loss characteristics. Mica capacitors in this specification are essential in RF circuits, high-frequency filtering, and precision tuning applications where stability and low dielectric loss are critical performance requirements.

Identifying equivalent and substitute parts becomes necessary when the primary part number experiences supply constraints, when design revisions require updated compliance certifications, or when inventory management requires sourcing from available stock alternatives that maintain identical electrical and mechanical specifications.

Substiute Parts

CD17FD121JO3

Cornell Dubilier Electronics (CDE)In Stock: 1121CD17FD121JO3 Datasheet

Current PartRFQ

CD17FD121JO3F

Cornell Dubilier Electronics (CDE)In Stock: 1143CD17FD121JO3F Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the CD17FD121JO3 are identified based on strict electrical and mechanical parameter matching. The substitution logic is based on the following criteria:

Electrical Parameters (Non-negotiable):

• Capacitance value: 120 pF (exact match required)
• Tolerance: ±5% (exact match required)
• Voltage rating: 500 V (minimum acceptable)
• Dielectric material: Mica (defines loss characteristics and stability)

Mechanical Parameters (Non-negotiable):

• Mounting type: Through Hole (assembly process compatibility)
• Package configuration: Radial (physical orientation and footprint)
• Lead spacing: 0.232" (5.90mm) (PCB hole pattern compatibility)
• Physical dimensions: 0.461" L x 0.181" W (11.70mm x 4.60mm) (board space constraints)
• Maximum seated height: 0.370" (9.40mm) (clearance requirements)

Performance Characteristics:

• Operating temperature range: -55°C to 150°C (thermal stability)
• Features: RF, High Q, Low Loss (application-specific performance)

Parts meeting all these criteria are classified as parametric equivalents and direct substitutes. Compliance certifications (RoHS status, REACH status) and inventory availability are secondary factors that do not affect electrical or mechanical substitutability.

Parameter Comparison

Engineering Selection Recommendations

The CD17FD121JO3F is a direct parametric equivalent to the CD17FD121JO3. All electrical and mechanical specifications are identical, including capacitance, tolerance, voltage rating, dielectric material, mounting configuration, lead spacing, physical dimensions, operating temperature range, and performance characteristics.

The primary difference between these two part numbers is compliance certification status:

• CD17FD121JO3: RoHS non-compliant, REACH Affected
• CD17FD121JO3F: ROHS3 Compliant, REACH Unaffected

Selection between these parts should be based on the regulatory and compliance requirements of the end application and target market. If the application or end-use region requires RoHS3 compliance or REACH compliance, the CD17FD121JO3F is the appropriate selection. If compliance certifications are not a design constraint, either part number is electrically and mechanically interchangeable.

Both part numbers are Active status products with confirmed inventory availability, ensuring supply continuity for production requirements.

Frequently Asked Questions (FAQ)

Q: Can CD17FD121JO3F be used as a direct replacement for CD17FD121JO3 in existing designs?

A: Yes. The CD17FD121JO3F is a direct parametric equivalent. All electrical specifications (120 pF capacitance, ±5% tolerance, 500 V rating, mica dielectric) and mechanical specifications (radial through-hole package, 0.232" lead spacing, identical physical dimensions) are identical. The parts are interchangeable from an electrical and mechanical assembly perspective.

Q: What is the difference between these two part numbers?

A: The CD17FD121JO3F incorporates ROHS3 compliance and REACH Unaffected status, whereas the CD17FD121JO3 is RoHS non-compliant and REACH Affected. All other specifications are identical.

Q: Does the RoHS compliance difference affect electrical performance?

A: No. RoHS compliance status reflects manufacturing process and material sourcing standards, not electrical or thermal performance. Both parts deliver identical electrical characteristics, frequency response, temperature stability, and RF performance.

Q: Are the physical dimensions and PCB footprints identical?

A: Yes. Both parts have identical dimensions (0.461" L x 0.181" W / 11.70mm x 4.60mm), identical lead spacing (0.232" / 5.90mm), and identical maximum seated height (0.370" / 9.40mm). PCB layouts and hole patterns are fully compatible.

Q: Which part should be selected for new designs?

A: For new designs, the CD17FD121JO3F is recommended if the application or target market requires RoHS3 or REACH compliance. If compliance certifications are not required, either part number is acceptable. Both are Active status products with confirmed inventory.

Q: Can these parts be mixed in the same production batch?

A: From an electrical and mechanical perspective, yes. However, compliance documentation and traceability records should reflect the specific part number used in each assembly to maintain regulatory compliance records and supply chain documentation accuracy.

Q: What is the operating temperature range for both parts?

A: Both parts operate across -55°C to 150°C. This range is identical and suitable for industrial and RF applications requiring wide thermal performance envelopes.

Q: Are there any lead-free or halogen-free considerations?

A: RoHS3 compliance status (applicable to CD17FD121JO3F) indicates adherence to lead-free and restricted substance requirements. The CD17FD121JO3 does not carry this certification. Consult specific material composition documentation if halogen-free or other restricted substance requirements apply to your application.