EDLRF684B5R5C Equivalent & Substitute Parts Reference

Part Overview

The EDLRF684B5R5C is a 680 mF supercapacitor manufactured by Cornell Dubilier Electronics (CDE) with a rated voltage of 5.5 V and through-hole radial can packaging. This component is classified as obsolete, making equivalent substitute parts necessary for ongoing design support and procurement continuity. The part operates across a temperature range of -25°C to 85°C with a specified lifetime of 2000 hours at 85°C.

Key Parameters

Parameter	Value	Unit
Capacitance	680	mF
Voltage - Rated	5.5	V
ESR @ 1kHz	20	Ohm
Tolerance	-20%, +80%	%
Lifetime @ 85°C	2000	Hrs
Mounting Type	Through Hole	—
Package Type	Radial, Can	—
Lead Spacing	0.197	inches (5.00 mm)
Diameter	0.846	inches (21.50 mm)
Operating Temperature Range	-25°C to 85°C	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the EDLRF684B5R5C is determined by strict equivalence across the following critical parameters:

Mandatory Matching Parameters:

Capacitance: 680 mF (exact match required)
Voltage Rating: 5.5 V (exact match required)
Tolerance: -20%, +80% (exact match required)
Mounting Type: Through Hole (exact match required)
Package Type: Radial, Can (exact match required)
Lead Spacing: 0.197" / 5.00 mm (exact match required)
Diameter: 0.846" / 21.50 mm (exact match required)

Allowable Variation Parameters:

ESR @ 1kHz: Substitutes may vary within acceptable circuit performance limits
Height - Seated: Minor variations acceptable if PCB clearance permits
Operating Temperature Range: Substitutes may extend the lower temperature limit
Lifetime @ 85°C: Substitutes must meet or exceed 2000 hours specification

The substitute part KW-5R5C684-R meets all mandatory matching parameters and is therefore classified as a direct equivalent.

Parameter Comparison

Parameter	EDLRF684B5R5C (CDE)	KW-5R5C684-R (Eaton)	Compatibility
Manufacturer	Cornell Dubilier Electronics	Eaton - Electronics Division	Different manufacturer
Series	RF	KW	Different series
Capacitance	680 mF	680 mF	Exact match
Voltage - Rated	5.5 V	5.5 V	Exact match
Tolerance	-20%, +80%	-20%, +80%	Exact match
ESR @ 1kHz	20 Ohm	30 Ohm	Substitute higher
Lifetime @ 85°C	2000 Hrs	2000 Hrs	Exact match
Termination	PC Pins	PC Pins	Exact match
Mounting Type	Through Hole	Through Hole	Exact match
Package / Case	Radial, Can	Radial, Can	Exact match
Lead Spacing	0.197" (5.00 mm)	0.197" (5.00 mm)	Exact match
Size / Dimension	0.846" Dia (21.50 mm)	0.846" Dia (21.50 mm)	Exact match
Height - Seated (Max)	0.374" (9.50 mm)	0.348" (8.85 mm)	Substitute shorter
Operating Temperature	-25°C ~ 85°C	-40°C ~ 85°C	Substitute extended range
Product Status	Obsolete	Active	Substitute in production
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Exact match

Engineering Selection Recommendations

The KW-5R5C684-R manufactured by Eaton - Electronics Division is a direct functional equivalent to the obsolete EDLRF684B5R5C. Selection of this substitute is supported by the following engineering factors:

Product Status: The EDLRF684B5R5C is obsolete, while the KW-5R5C684-R is active in production. This ensures long-term availability and supply chain continuity for new designs and production runs.

Electrical Equivalence: Both parts share identical capacitance (680 mF), voltage rating (5.5 V), tolerance (-20%, +80%), and lifetime specification (2000 Hrs @ 85°C). The ESR difference of 10 Ohm (20 Ohm vs. 30 Ohm @ 1kHz) must be evaluated within the specific circuit application to confirm acceptable performance.

Mechanical Compatibility: Lead spacing, package diameter, and termination type are identical. The KW-5R5C684-R has a reduced seated height (0.348" vs. 0.374"), which provides improved PCB clearance and does not restrict compatibility.

Compliance: Both parts are ROHS3 compliant. The KW-5R5C684-R carries REACH Unaffected status, providing additional regulatory assurance.

Temperature Performance: The KW-5R5C684-R extends the lower operating temperature limit to -40°C, exceeding the original specification of -25°C.

Frequently Asked Questions (FAQ)

Q: Can the KW-5R5C684-R be used as a direct replacement for the EDLRF684B5R5C in existing designs?

A: Yes. The KW-5R5C684-R meets all mandatory electrical and mechanical parameters. The 10 Ohm increase in ESR must be verified against circuit performance requirements, particularly in applications sensitive to impedance characteristics.

Q: What is the significance of the ESR difference between these parts?

A: The EDLRF684B5R5C has an ESR of 20 Ohm @ 1kHz, while the KW-5R5C684-R has 30 Ohm @ 1kHz. This 50% increase affects charging/discharging rates and heat dissipation. Circuit simulation or testing is necessary to confirm acceptable performance in the target application.

Q: Are there any PCB layout considerations when switching from the EDLRF684B5R5C to the KW-5R5C684-R?

A: No layout changes are required. Both parts use identical lead spacing (0.197" / 5.00 mm) and package diameter (0.846" / 21.50 mm). The reduced height of the KW-5R5C684-R (0.348" vs. 0.374") provides additional clearance and does not create compatibility issues.

Q: Why is the operating temperature range different?

A: The KW-5R5C684-R extends the lower operating limit to -40°C compared to the EDLRF684B5R5C at -25°C. Both parts maintain the same upper limit of 85°C and identical lifetime specifications at this temperature.

Q: Are both parts RoHS compliant?

A: Yes. Both the EDLRF684B5R5C and KW-5R5C684-R are ROHS3 compliant. The KW-5R5C684-R additionally carries REACH Unaffected status.

Q: What is the inventory status of these parts?

A: The EDLRF684B5R5C (obsolete) has 779 pieces in stock. The KW-5R5C684-R (active) has 6522 pieces in stock, ensuring reliable long-term availability.

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