CM05FD391JO3 Equivalent & Substitute Parts

Part Overview

The CM05FD391JO3 is a 390 pF mica capacitor rated for 500 V operation, manufactured by Cornell Dubilier Electronics (CDE) in the CM05 series. This through-hole radial component is designed for general-purpose applications requiring high voltage stability and precision capacitance values. The part is currently active in production with 812 units in stock.

Equivalent substitute parts are necessary when the CM05FD391JO3 becomes unavailable, when alternative compliance certifications are required, or when inventory constraints necessitate sourcing from the same manufacturer's compatible product lines. The CD15 series substitutes maintain identical electrical and mechanical specifications while offering different regulatory compliance profiles.

Key Parameters

Parameter	Value
Capacitance	390 pF
Tolerance	±5%
Voltage Rating	500 V
Dielectric Material	Mica
Operating Temperature Range	-55°C to 125°C
Mounting Type	Through Hole
Package Type	Radial
Lead Spacing	0.232" (5.90 mm)
Physical Dimensions	0.469" L × 0.209" W (11.90 mm × 5.30 mm)
Height (Seated Max)	0.390" (9.90 mm)

Substitute Part Grouping Explanation

Substitution eligibility for the CM05FD391JO3 is determined by strict equivalence across the following parameters:

Capacitance Value: 390 pF (exact match required)
Tolerance: ±5% (exact match required)
Voltage Rating: 500 V (exact match required)
Dielectric Material: Mica (exact match required)
Operating Temperature Range: -55°C to 125°C (exact match required)
Mounting Type: Through Hole (exact match required)
Package Configuration: Radial (exact match required)
Lead Spacing: 0.232" (5.90 mm) (exact match required)
Physical Dimensions: 0.469" L × 0.209" W (exact match required)

Both substitute parts—CD15FD391JO3 and CD15FD391JO3F—meet all electrical and mechanical equivalence criteria. These parts are manufactured by the same supplier (Cornell Dubilier Electronics) and belong to the CD15 series, which maintains full compatibility with CM05 series specifications for this capacitance and voltage rating.

Parameter Comparison

Parameter	CM05FD391JO3	CD15FD391JO3	CD15FD391JO3F
Manufacturer	Cornell Dubilier Electronics	Cornell Dubilier Electronics	Cornell Dubilier Electronics
Series	CM05	CD15	CD15
Capacitance	390 pF	390 pF	390 pF
Tolerance	±5%	±5%	±5%
Voltage Rating	500 V	500 V	500 V
Dielectric Material	Mica	Mica	Mica
Operating Temperature	-55°C to 125°C	-55°C to 125°C	-55°C to 125°C
Mounting Type	Through Hole	Through Hole	Through Hole
Package Type	Radial	Radial	Radial
Lead Spacing	0.232" (5.90 mm)	0.232" (5.90 mm)	0.232" (5.90 mm)
Dimensions	0.469" L × 0.209" W	0.469" L × 0.209" W	0.469" L × 0.209" W
Height (Seated Max)	0.390" (9.90 mm)	0.390" (9.90 mm)	0.390" (9.90 mm)
Product Status	Active	Active	Active
RoHS Status	Non-compliant	Non-compliant	ROHS3 Compliant
REACH Status	REACH Affected	REACH Affected	REACH Unaffected
Current Inventory	812 Pcs	969 Pcs	3183 Pcs

Engineering Selection Recommendations

CM05FD391JO3: Select this part when the original specification requires the CM05 series designation and when RoHS non-compliance and REACH-affected status are acceptable for the application. Current inventory of 812 units supports immediate availability.

CD15FD391JO3: This substitute provides identical electrical and mechanical performance to the CM05FD391JO3 with equivalent regulatory status (RoHS non-compliant, REACH Affected). Inventory of 969 units is available. Use this part when CM05 series availability is constrained and regulatory compliance requirements match the original specification.

CD15FD391JO3F: This substitute is the preferred alternative when RoHS3 compliance and REACH-unaffected status are required by the application or end-use market. The CD15FD391JO3F maintains all electrical and mechanical equivalence while offering enhanced regulatory compliance. Highest inventory availability at 3183 units supports sustained supply chain continuity.

All three parts are manufactured by Cornell Dubilier Electronics and share identical ECCN (EAR99) and HTSUS (8532.29.0020) classifications.

Frequently Asked Questions (FAQ)

Q: Can CD15FD391JO3 and CD15FD391JO3F be used interchangeably with CM05FD391JO3?

A: Yes. Both CD15 series parts are electrically and mechanically equivalent to the CM05FD391JO3. All three parts have identical capacitance (390 pF), tolerance (±5%), voltage rating (500 V), operating temperature range (-55°C to 125°C), lead spacing (0.232"), and physical dimensions. The differences are limited to series designation and regulatory compliance certifications.

Q: What is the difference between CD15FD391JO3 and CD15FD391JO3F?

A: The primary differences are regulatory compliance and inventory levels. CD15FD391JO3 is RoHS non-compliant and REACH Affected, matching the original CM05FD391JO3 compliance profile. CD15FD391JO3F is ROHS3 Compliant and REACH Unaffected, making it suitable for applications with stricter environmental regulations. Electrically and mechanically, both parts are identical.

Q: Will these substitute parts fit the same PCB footprint as the CM05FD391JO3?

A: Yes. All three parts have identical lead spacing (0.232" / 5.90 mm), physical dimensions (0.469" L × 0.209" W), and maximum seated height (0.390"). They are direct mechanical replacements requiring no PCB layout modifications.

Q: Which substitute should I select for new designs?

A: Selection depends on regulatory requirements. For applications requiring RoHS3 compliance and REACH-unaffected status, use CD15FD391JO3F. For applications with no specific environmental compliance mandates, either CD15FD391JO3 or CM05FD391JO3 is acceptable based on availability and cost considerations.

Q: Are there any temperature or voltage derating considerations when substituting these parts?

A: No. All three parts operate identically across the full -55°C to 125°C temperature range and are rated for 500 V operation. No derating or performance adjustments are required when substituting between these parts.

Q: What is the lead spacing tolerance for these radial capacitors?

A: The specified lead spacing is 0.232" (5.90 mm). This dimension is consistent across all three parts and determines PCB hole spacing requirements.

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