Equivalent & Substitute Parts for 688CKE035M

Part Overview

The 688CKE035M is a 6800 µF, 35 V aluminum electrolytic capacitor manufactured by Cornell Dubilier / Illinois Capacitor in the CKE series. This radial, through-hole component is designed for bypass and decoupling applications with a rated lifetime of 2000 hours at 105°C. The part is currently active in production with 968 units in stock. Substitute parts are identified to provide alternative sourcing options when the primary part becomes unavailable or when supply chain optimization is required.

Key Parameters

Parameter	Specification
Capacitance	6800 µF
Voltage Rating	35 V
Tolerance	±20%
Package Type	Radial, Can
Mounting Type	Through Hole
Lead Spacing	0.295" (7.50 mm)
Diameter	0.709" (18.00 mm)
Height (Max)	1.634" (41.50 mm)
Lifetime	2000 Hrs @ 105°C
Polarization	Polar
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the 688CKE035M is determined by the following critical parameters:

Electrical Parameters:

Capacitance value: 6800 µF (exact match required)
Voltage rating: 35 V (exact match required)
Tolerance: ±20% (exact match required)
Lifetime rating: 2000 Hrs @ 105°C (exact match required)
Polarization: Polar (exact match required)

Mechanical Parameters:

Package type: Radial, Can (exact match required)
Mounting type: Through Hole (exact match required)
Lead spacing: 0.295" (7.50 mm) (exact match required)
Physical dimensions: 0.709" Dia × 1.634" Height (exact match required)

Compliance Parameters:

RoHS3 Compliant (required)
REACH Unaffected (required)

The substitute part EKMQ350ELL682MM40S from Chemi-Con meets all critical electrical, mechanical, and compliance requirements for direct substitution with the 688CKE035M.

Parameter Comparison

Parameter	688CKE035M (Cornell Dubilier)	EKMQ350ELL682MM40S (Chemi-Con)
Capacitance	6800 µF	6800 µF
Voltage Rating	35 V	35 V
Tolerance	±20%	±20%
Operating Temperature Range	-40°C ~ 105°C	-55°C ~ 105°C
Lifetime @ Temp.	2000 Hrs @ 105°C	2000 Hrs @ 105°C
Lead Spacing	0.295" (7.50 mm)	0.295" (7.50 mm)
Diameter	0.709" (18.00 mm)	0.709" (18.00 mm)
Height (Max)	1.634" (41.50 mm)	1.634" (41.50 mm)
Package Type	Radial, Can	Radial, Can
Mounting Type	Through Hole	Through Hole
RoHS Status	ROHS3 Compliant	ROHS3 Compliant
REACH Status	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

The EKMQ350ELL682MM40S is a qualified substitute for the 688CKE035M based on the following factors:

Electrical Compatibility: Both parts share identical capacitance (6800 µF), voltage rating (35 V), tolerance (±20%), and lifetime specification (2000 Hrs @ 105°C). These parameters ensure functional equivalence in bypass and decoupling applications.

Mechanical Compatibility: Physical dimensions, lead spacing, and package configuration are identical between both parts, ensuring direct PCB compatibility without layout modifications.

Compliance Alignment: Both parts maintain ROHS3 compliance and REACH unaffected status, meeting regulatory requirements for current manufacturing standards.

Temperature Performance: The Chemi-Con substitute provides an extended lower operating temperature limit (-55°C versus -40°C), offering broader environmental compatibility without compromising upper temperature performance.

Availability: The substitute part is currently in stock with 708 units available, providing supply chain flexibility.

Frequently Asked Questions (FAQ)

Q: Can the EKMQ350ELL682MM40S be used as a direct replacement for the 688CKE035M on existing PCBs?

A: Yes. Both parts are identical in physical dimensions, lead spacing, and electrical specifications. No PCB layout modifications are required for substitution.

Q: Are there differences in ESR (Equivalent Series Resistance) between these parts?

A: The 688CKE035M specifies 58.5 mOhm @ 120 Hz. The EKMQ350ELL682MM40S does not provide ESR specification in the available data. Applications requiring specific ESR performance should reference the Chemi-Con datasheet for detailed ESR characteristics.

Q: What is the difference in ripple current ratings?

A: The 688CKE035M is rated for 2.4 A @ 120 Hz and 3.36 A @ 100 kHz. The EKMQ350ELL682MM40S is rated for 2 A @ 120 Hz and 2.16 A @ 100 kHz. Applications requiring ripple current handling above the Chemi-Con ratings should retain the Cornell Dubilier part.

Q: Do both parts have the same operating temperature range?

A: No. The 688CKE035M operates from -40°C to 105°C, while the EKMQ350ELL682MM40S operates from -55°C to 105°C. The Chemi-Con part provides extended low-temperature capability.

Q: Are both parts RoHS compliant?

A: Yes. Both the 688CKE035M and EKMQ350ELL682MM40S are ROHS3 compliant and REACH unaffected.

Q: What applications are these capacitors suitable for?

A: The 688CKE035M is specified for bypass and decoupling applications. The EKMQ350ELL682MM40S is specified for general purpose applications. Both are suitable for bypass and decoupling use cases.

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