684MMR100K Film Capacitor Equivalent & Substitute Parts

Part Overview

The 684MMR100K is a 0.68 µF film capacitor manufactured by Cornell Dubilier / Illinois Capacitor, designed for general-purpose applications requiring polyester metallized dielectric construction. This radial through-hole component operates across a temperature range of -40°C to 105°C with a 100V DC voltage rating and ±10% capacitance tolerance. The part maintains Active product status with 895 units currently in stock. Substitute parts are identified to provide alternative sourcing options when primary inventory is unavailable or when supply chain diversification is required.

Key Parameters

Parameter	Specification
Capacitance	0.68 µF
Tolerance	±10%
Voltage Rating (DC)	100V
Voltage Rating (AC)	63V
Dielectric Material	Polyester, Metallized
Operating Temperature Range	-40°C to 105°C
Mounting Type	Through Hole
Package Type	Radial
Lead Spacing	0.394" (10.00mm)
Termination	PC Pins
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the 684MMR100K is determined by strict equivalence across the following critical parameters:

Electrical Parameters:

Capacitance value: 0.68 µF (exact match required)
Tolerance: ±10% (exact match required)
Voltage rating (DC): 100V (minimum requirement; higher ratings acceptable)
Voltage rating (AC): 63V (minimum requirement; higher ratings acceptable)
Dielectric material: Polyester, Metallized (exact match required)

Mechanical Parameters:

Mounting type: Through Hole (exact match required)
Package configuration: Radial (exact match required)
Lead spacing: 0.394" / 10.00mm (exact match required)
Termination style: PC Pins (exact match required)

Environmental & Compliance Parameters:

Operating temperature range: -40°C to 105°C (exact match required)
RoHS3 compliance (required for modern applications)

The ECQ-E1684KF from Panasonic Electronic Components meets all substitution criteria and is classified as a direct equivalent.

Parameter Comparison

Parameter	684MMR100K (Cornell Dubilier)	ECQ-E1684KF (Panasonic)	Match Status
Capacitance	0.68 µF	0.68 µF	Equivalent
Tolerance	±10%	±10%	Equivalent
Voltage Rating (DC)	100V	100V	Equivalent
Voltage Rating (AC)	63V	63V	Equivalent
Dielectric Material	Polyester, Metallized	Polyester, Metallized	Equivalent
Operating Temperature	-40°C to 105°C	-40°C to 105°C	Equivalent
Mounting Type	Through Hole	Through Hole	Equivalent
Package Type	Radial	Radial	Equivalent
Lead Spacing	0.394" (10.00mm)	0.394" (10.00mm)	Equivalent
Termination	PC Pins	PC Pins	Equivalent
Physical Dimensions (L x W)	0.472" x 0.236" (12.00mm x 6.00mm)	0.472" x 0.236" (12.00mm x 6.00mm)	Equivalent
Height (Seated Max)	0.512" (13.00mm)	0.508" (12.90mm)	Compatible
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Equivalent
REACH Status	REACH Unaffected	REACH Unaffected	Equivalent
ECCN Classification	EAR99	EAR99	Equivalent

Engineering Selection Recommendations

Primary Part: 684MMR100K The Cornell Dubilier / Illinois Capacitor 684MMR100K is the specified component with confirmed Active product status and 895 units in current inventory. This part is ROHS3 compliant and REACH unaffected, meeting modern regulatory requirements for electronic component procurement.

Substitute Part: ECQ-E1684KF The Panasonic Electronic Components ECQ-E1684KF is a direct functional equivalent with identical electrical specifications, mechanical configuration, and environmental operating parameters. This part is also ROHS3 compliant and REACH unaffected. The seated height differential of 0.004" (0.10mm) is within acceptable PCB layout tolerances for through-hole radial capacitors. The ECQ-E1684KF maintains Active product status with 1,128 units in inventory, providing enhanced supply chain availability.

Both parts are suitable for direct substitution in general-purpose film capacitor applications requiring 0.68 µF capacitance at 100V DC with polyester metallized dielectric construction.

Frequently Asked Questions (FAQ)

Q: Can the ECQ-E1684KF replace the 684MMR100K in existing circuit designs? A: Yes. The ECQ-E1684KF is electrically and mechanically equivalent across all critical parameters: capacitance (0.68 µF), tolerance (±10%), voltage rating (100V DC / 63V AC), dielectric material (polyester metallized), operating temperature range (-40°C to 105°C), and lead spacing (10.00mm). Direct substitution is supported without circuit modification.

Q: Are there any physical compatibility concerns between these two parts? A: Physical compatibility is confirmed. Both parts feature identical length (0.472" / 12.00mm), width (0.236" / 6.00mm), and lead spacing (0.394" / 10.00mm). The seated height difference of 0.004" (0.10mm) between the 684MMR100K (13.00mm) and ECQ-E1684KF (12.90mm) is negligible for PCB layout purposes and does not affect mounting or electrical performance.

Q: Do both parts meet current regulatory compliance requirements? A: Yes. Both the 684MMR100K and ECQ-E1684KF are ROHS3 compliant and REACH unaffected, meeting current environmental and hazardous substance regulations for electronic component procurement and use.

Q: What is the tolerance specification for these capacitors? A: Both parts carry a ±10% capacitance tolerance, meaning the actual capacitance value will fall within the range of 0.612 µF to 0.748 µF. This tolerance is suitable for general-purpose applications where precise capacitance matching is not required.

Q: Are these parts suitable for AC applications? A: Both parts are rated for 63V AC operation, making them suitable for AC applications within this voltage specification. The 100V DC rating provides additional margin for DC-biased or mixed AC/DC operating conditions.

Q: What is the operating temperature range for these capacitors? A: Both the 684MMR100K and ECQ-E1684KF operate across a temperature range of -40°C to 105°C, supporting applications in industrial, automotive, and consumer electronics environments with extended temperature requirements.

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