AFK686M35X16B-F Equivalent & Substitute Parts

Part Overview

The AFK686M35X16B-F is a 68 µF, 35 V aluminum electrolytic capacitor manufactured by Cornell Dubilier Electronics (CDE) in a surface mount radial can package. This component is designed for automotive, bypass, and decoupling applications with AEC-Q200 qualification. The part is currently discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives from active manufacturers. Substitute parts must maintain electrical performance characteristics and mechanical compatibility for direct board-level replacement.

Substiute Parts

AFK686M35X16B-F

Cornell Dubilier Electronics (CDE)In Stock: 996AFK686M35X16B-F Datasheet

Current PartRFQ

EEE-FK1V680XP

Panasonic Electronic ComponentsIn Stock: 1019EEE-FK1V680XP Datasheet

DirectRFQ

EEE-FKV680XAP

Panasonic Electronic ComponentsIn Stock: 2898EEE-FKV680XAP Datasheet

DirectRFQ

UCL1V680MCL1GS

NichiconIn Stock: 744UCL1V680MCL1GS Datasheet

DirectRFQ

UUD1V680MCL1GS

NichiconIn Stock: 1353UUD1V680MCL1GS Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the AFK686M35X16B-F is determined by strict equivalence across the following electrical and mechanical parameters:

Electrical Equivalence Criteria:

• Capacitance: 68 µF (exact match required)
• Voltage Rating: 35 V (exact match required)
• Tolerance: ±20% (exact match required)
• Lifetime: 2000 Hrs @ 105°C (exact match required)
• Operating Temperature: -55°C to 105°C (exact match required)
• Polarization: Polar (exact match required)

Mechanical Equivalence Criteria:

• Mounting Type: Surface Mount (exact match required)
• Package / Case: Radial, Can - SMD (exact match required)
• Size / Dimension: 0.248" Dia (6.30 mm) (exact match required)
• Height - Seated (Max): 8.20 mm or less (height compatibility)
• Surface Mount Land Size: Compatible footprint (6.60 mm x 6.60 mm to 6.60 mm x 7.80 mm)

Performance Parameters:

• ESR @ 100 kHz: 340 mOhms (nominal specification)
• Ripple Current @ 100 kHz: 280 mA (nominal specification)
• Ripple Current @ 120 Hz: 210 mA (nominal specification)

All substitute parts listed meet these criteria and are qualified for direct replacement in the original application circuit.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitutes (Automotive-Qualified):

The EEE-FK1V680XP (Panasonic) and UUD1V680MCL1GS (Nichicon) are the preferred substitutes for the AFK686M35X16B-F. Both parts maintain AEC-Q200 automotive qualification, matching the original part's compliance profile. These components are currently in active production status, ensuring long-term supply availability. The EEE-FK1V680XP offers identical electrical specifications with a reduced height of 8.00 mm, providing improved board-level clearance. The UUD1V680MCL1GS maintains all electrical parameters including ESR and ripple current ratings at specification.

Secondary Substitute (General Purpose):

The EEE-FKV680XAP (Panasonic) is suitable for applications where automotive qualification is not mandatory. This part carries AEC-Q200 rating and is actively produced. The ripple current at 120 Hz is specified at 182 mA, which is lower than the original 210 mA specification but remains within acceptable operating margins for most bypass and decoupling applications.

Alternative Substitute (Enhanced Performance):

The UCL1V680MCL1GS (Nichicon) provides superior ripple current handling with 600 mA @ 100 kHz and reduced ESR of 160 mOhm. This part is not AEC-Q200 rated and is classified as general purpose. Selection of this part is appropriate only when automotive qualification is not required and enhanced ripple current performance is beneficial to circuit operation.

Compliance Considerations:

All substitute parts are ROHS3 compliant, REACH unaffected, and carry MSL 1 (Unlimited) moisture sensitivity ratings, matching the original part's environmental compliance profile. The AFK686M35X16B-F discontinuation status necessitates transition to one of the active substitute parts for new designs and ongoing production requirements.

Frequently Asked Questions (FAQ)

Q: Can the EEE-FK1V680XP directly replace the AFK686M35X16B-F on existing PCBs?

A: Yes. The EEE-FK1V680XP maintains identical capacitance (68 µF), voltage rating (35 V), tolerance (±20%), and lifetime (2000 Hrs @ 105°C). The height is reduced from 8.20 mm to 8.00 mm, which provides improved clearance. The surface mount land size is compatible with standard 6.60 mm x 6.60 mm footprints. Direct substitution is supported without circuit modification.

Q: What is the difference between the Panasonic EEE-FK1V680XP and EEE-FKV680XAP?

A: Both parts are Panasonic FK series 68 µF, 35 V capacitors with identical mechanical dimensions and AEC-Q200 qualification. The primary difference is ripple current specification at 120 Hz: EEE-FK1V680XP is rated at 210 mA, while EEE-FKV680XAP is rated at 182 mA. The EEE-FK1V680XP is the closer electrical match to the original AFK686M35X16B-F.

Q: Is the Nichicon UCL1V680MCL1GS suitable for automotive applications?

A: The UCL1V680MCL1GS is not AEC-Q200 rated and is classified as general purpose. It is not recommended for automotive applications where AEC-Q200 qualification is a design requirement. For automotive use, select either the EEE-FK1V680XP or UUD1V680MCL1GS.

Q: What are the key electrical parameters that determine substitution compatibility?

A: Substitution compatibility is determined by exact equivalence in capacitance (68 µF), voltage rating (35 V), tolerance (±20%), lifetime (2000 Hrs @ 105°C), and operating temperature range (-55°C to 105°C). ESR and ripple current specifications must meet or exceed the original part's ratings. Mechanical compatibility requires identical mounting type (surface mount), package type (radial can SMD), and compatible physical dimensions.

Q: Can the UCL1V680MCL1GS be used in place of the AFK686M35X16B-F if ripple current performance is critical?

A: The UCL1V680MCL1GS provides superior ripple current performance (600 mA @ 100 kHz versus 280 mA) and lower ESR (160 mOhm versus 340 mOhm). However, this part lacks AEC-Q200 automotive qualification. Selection depends on whether automotive qualification is a mandatory design requirement. If automotive qualification is not required and enhanced ripple current handling is beneficial, the UCL1V680MCL1GS is electrically compatible.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed (EEE-FK1V680XP, EEE-FKV680XAP, UCL1V680MCL1GS, and UUD1V680MCL1GS) are ROHS3 compliant and REACH unaffected, matching the environmental compliance profile of the original AFK686M35X16B-F.

Q: What is the impact of the reduced height in the Panasonic substitutes?

A: The Panasonic EEE-FK1V680XP and EEE-FKV680XAP are specified at 8.00 mm height versus the original 8.20 mm. This 0.20 mm reduction provides improved board-level clearance and does not create compatibility issues. The reduced height is advantageous for space-constrained applications.

Q: Which substitute part offers the closest electrical match to the original AFK686M35X16B-F?

A: The UUD1V680MCL1GS (Nichicon) provides the closest electrical match, maintaining identical ESR (340 mOhm @ 100 kHz) and ripple current specifications (280 mA @ 100 kHz, 140 mA @ 120 Hz). The EEE-FK1V680XP (Panasonic) is the second-closest match with identical ripple current at 100 kHz (280 mA) and 120 Hz (210 mA). Both parts carry AEC-Q200 automotive qualification.