CD18FD751JO3 Mica Capacitor 750pF 500V Radial - Equivalent & Substitute Parts

Part Overview

The CD18FD751JO3 is a 750 pF mica capacitor rated for 500 V with radial through-hole mounting, 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, tuning networks, and high-frequency applications where stability and low dielectric loss are critical performance requirements. Identifying equivalent and substitute parts ensures design flexibility, supply chain continuity, and component availability across manufacturing cycles.

Key Parameters

Parameter	Value	Significance for Substitution
Capacitance	750 pF	Primary electrical specification; must match exactly
Tolerance	±5%	Determines circuit accuracy; substitutes must maintain same tolerance
Voltage Rating	500 V	Critical safety and reliability parameter; substitutes must equal or exceed
Dielectric Material	Mica	Defines electrical characteristics (Q factor, loss, temperature stability); must remain mica
Mounting Type	Through Hole Radial	Determines PCB compatibility and assembly process
Lead Spacing	0.343" (8.70mm)	Physical footprint requirement; must match for direct PCB substitution
Operating Temperature Range	-55°C to 150°C	Environmental performance specification; substitutes must cover same range
Package / Case	Radial	Form factor and mechanical fit requirement
RoHS Status	ROHS3 Compliant	Regulatory compliance requirement for restricted substances

Substitute Part Grouping Explanation

Substitution logic for the CD18FD751JO3 is based on strict electrical and mechanical parameter matching within the mica capacitor category. The following parameters are non-negotiable for direct substitution:

Electrical Parameters (Must Match Exactly):

Capacitance: 750 pF
Tolerance: ±5%
Voltage Rating: 500 V (minimum)
Dielectric Material: Mica

Mechanical Parameters (Must Match Exactly):

Mounting Type: Through Hole Radial
Lead Spacing: 0.343" (8.70mm)
Package / Case: Radial

Environmental & Compliance Parameters (Must Match or Exceed):

Operating Temperature Range: -55°C to 150°C (minimum)
RoHS Status: ROHS3 Compliant

Substitute parts are identified only when all parameters listed above are identical to the main part specification. No parameter relaxation, approximation, or functional equivalence is applied.

Parameter Comparison

Parameter	CD18FD751JO3 (Main Part)	CD18FD751JO3F (Substitute)	Match Status
Manufacturer	Cornell Dubilier Electronics (CDE)	Cornell Dubilier Electronics (CDE)	Identical
Series	CD18	CD18	Identical
Capacitance	750 pF	750 pF	Identical
Tolerance	±5%	±5%	Identical
Voltage Rating	500 V	500 V	Identical
Dielectric Material	Mica	Mica	Identical
Operating Temperature	-55°C to 150°C	-55°C to 150°C	Identical
Mounting Type	Through Hole	Through Hole	Identical
Package / Case	Radial	Radial	Identical
Lead Spacing	0.343" (8.70mm)	0.343" (8.70mm)	Identical
Size / Dimension	0.650" L x 0.209" W (16.50mm x 5.30mm)	0.650" L x 0.209" W (16.50mm x 5.30mm)	Identical
Height - Seated (Max)	0.512" (13.00mm)	0.512" (13.00mm)	Identical
Features	RF, High Q, Low Loss	RF, High Q, Low Loss	Identical
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Identical
MSL Rating	1 (Unlimited)	1 (Unlimited)	Identical
REACH Status	REACH Unaffected	REACH Unaffected	Identical
Product Status	Active	Active	Identical

Engineering Selection Recommendations

CD18FD751JO3F is a direct parametric equivalent to CD18FD751JO3. Both parts are manufactured by Cornell Dubilier Electronics within the CD18 series and share identical electrical, mechanical, and environmental specifications. Selection between these parts is based on availability and inventory status:

CD18FD751JO3: 1045 pieces in stock
CD18FD751JO3F: 913 pieces in stock

Both parts maintain Active product status and full compliance with ROHS3 and REACH regulations. No performance differentiation exists between these parts based on provided specifications. Component selection should prioritize inventory availability and supply chain lead times. Both parts are suitable for direct PCB substitution without design modification or re-qualification.

Frequently Asked Questions (FAQ)

Q: Can CD18FD751JO3F be used as a direct replacement for CD18FD751JO3 in existing designs?

A: Yes. CD18FD751JO3F is a parametric equivalent with identical electrical, mechanical, and environmental specifications. Direct PCB substitution is supported without design changes.

Q: Are there any differences in performance between CD18FD751JO3 and CD18FD751JO3F?

A: No. Both parts are manufactured by Cornell Dubilier Electronics with identical capacitance (750 pF), tolerance (±5%), voltage rating (500 V), operating temperature range (-55°C to 150°C), and RF characteristics (High Q, Low Loss).

Q: Do both parts have the same physical footprint?

A: Yes. Both parts have identical lead spacing (0.343" / 8.70mm), dimensions (0.650" L x 0.209" W), and maximum seated height (0.512" / 13.00mm). PCB layouts require no modification.

Q: Are both parts RoHS compliant?

A: Yes. Both CD18FD751JO3 and CD18FD751JO3F are ROHS3 Compliant and REACH Unaffected, meeting current regulatory requirements.

Q: What is the moisture sensitivity level for these parts?

A: Both parts have MSL Rating 1 (Unlimited), indicating no moisture sensitivity restrictions during storage or handling.

Q: Can these mica capacitors be used in high-frequency RF applications?

A: Yes. Both parts are specified for RF applications with High Q factor and Low Loss characteristics, suitable for tuning networks, impedance matching, and frequency-selective circuits.

Q: What is the difference between the part numbers CD18FD751JO3 and CD18FD751JO3F?

A: The suffix "F" in CD18FD751JO3F indicates a variant designation within the same product line. All electrical and mechanical specifications remain identical. The difference is administrative or relates to manufacturing batch coding.

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