AFK338M25R44B-F Equivalent & Substitute Parts

Part Overview

The AFK338M25R44B-F is a 3300 µF, 25 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 to maintain supply chain continuity for ongoing production and repair applications.

Key Parameters

Parameter	Value	Significance for Substitution
Capacitance	3300 µF	Core electrical specification; must match exactly
Voltage Rating	25 V	Core electrical specification; must match exactly
Tolerance	±20%	Acceptable variation range; must match or be tighter
Operating Temperature Range	-55°C ~ 105°C	Environmental operating limits; substitute must meet or exceed
Lifetime @ Temperature	5000 Hrs @ 105°C	Reliability specification; substitute must meet or exceed
Package / Case	Radial, Can - SMD	Physical form factor; must match for PCB compatibility
Size / Dimension	0.709" Dia (18.00mm)	Physical footprint; must match for board layout
Height - Seated (Max)	0.669" (17.00mm)	Clearance requirement; substitute height must not exceed
Surface Mount Land Size	0.748" L x 0.827" W (19.00mm x 21.00mm)	PCB pad pattern; must be compatible with board design
Mounting Type	Surface Mount	Assembly process compatibility; must match
Polarization	Polar	Circuit polarity requirement; must match
RoHS Status	ROHS3 Compliant	Regulatory compliance; substitute must maintain compliance
AEC-Q200 Rating	Yes	Automotive qualification; critical for automotive applications

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict adherence to the following parameters:

Mandatory Match Criteria:

Capacitance: 3300 µF (exact)
Voltage Rating: 25 V (exact)
Tolerance: ±20% (or tighter)
Package / Case: Radial, Can - SMD (exact)
Diameter: 0.709" (18.00mm) (exact)
Mounting Type: Surface Mount (exact)
Polarization: Polar (exact)

Allowable Variation Criteria:

Height - Seated (Max): Must not exceed 0.669" (17.00mm) for standard compatibility; up to 0.846" (21.50mm) acceptable only if board clearance permits
Surface Mount Land Size: Minor variations acceptable if within standard PCB design tolerances
ESR / Impedance: Variations acceptable if ripple current ratings are maintained
Lifetime @ Temperature: Substitute must meet or exceed 5000 Hrs @ 105°C
Operating Temperature Range: Substitute must cover -55°C ~ 105°C minimum

Compliance Criteria:

RoHS3 Compliance: Required
AEC-Q200 Rating: Required for automotive applications; optional for general purpose applications

Substitute parts are grouped into two categories: Direct Equivalents (identical electrical and mechanical specifications) and Similar Parts (meet core electrical requirements with minor dimensional or performance variations).

Parameter Comparison

Parameter	AFK338M25R44B-F (CDE)	EEE-FK1E332AM (Panasonic)	EEV-FK1E332M (Panasonic)	EEV-FK1E332V (Panasonic)	EMVY250GRA332MMN0S (Chemi-Con)
Manufacturer	Cornell Dubilier Electronics	Panasonic Electronic Components	Panasonic Electronic Components	Panasonic Electronic Components	Chemi-Con
Product Status	Discontinued	Active	Active	Active	Active
Capacitance	3300 µF	3300 µF	3300 µF	3300 µF	3300 µF
Voltage Rating	25 V	25 V	25 V	25 V	25 V
Tolerance	±20%	±20%	±20%	±20%	±20%
Operating Temperature	-55°C ~ 105°C	-55°C ~ 105°C	-55°C ~ 105°C	-55°C ~ 105°C	-55°C ~ 105°C
Lifetime @ 105°C	5000 Hrs	5000 Hrs	5000 Hrs	5000 Hrs	5000 Hrs
Package / Case	Radial, Can - SMD	Radial, Can - SMD	Radial, Can - SMD	Radial, Can - SMD	Radial, Can - SMD
Diameter	0.709" (18.00mm)	0.709" (18.00mm)	0.709" (18.00mm)	0.709" (18.00mm)	0.709" (18.00mm)
Height - Seated (Max)	0.669" (17.00mm)	0.669" (17.00mm)	0.669" (17.00mm)	0.650" (16.50mm)	0.846" (21.50mm)
Surface Mount Land Size	0.748" L x 0.827" W (19.00mm x 21.00mm)	0.748" L x 0.748" W (19.00mm x 19.00mm)	0.748" L x 0.748" W (19.00mm x 19.00mm)	0.748" L x 0.748" W (19.00mm x 19.00mm)	0.748" L x 0.748" W (19.00mm x 19.00mm)
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Polarization	Polar	Polar	Polar	Polar	Polar
Ripple Current @ 120 Hz	1.545 A	1.545 A	1.545 A	1.545 A	1.3125 A
Ripple Current @ 100 kHz	2.06 A	2.06 A	2.06 A	2.06 A	1.75 A
Impedance	33 mOhms	33 mOhms	33 mOhms	33 mOhms	38 mOhms
AEC-Q200 Rating	Yes	Yes	Yes	Yes	No
RoHS3 Compliance	Yes	Yes	Yes	Yes	Yes
MSL Rating	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Inventory Status	1065 Pcs	3433 Pcs	11368 Pcs	1223 Pcs	941 Pcs

Engineering Selection Recommendations

Direct Equivalent Substitutes (Automotive Applications):

For applications requiring AEC-Q200 automotive qualification, the following Panasonic parts provide direct electrical and mechanical equivalence:

EEV-FK1E332M: Panasonic FK series, active product status, identical electrical specifications, standard height 0.669" (17.00mm), highest inventory availability (11,368 pcs). Recommended as primary substitute for automotive bypass and decoupling applications.
EEE-FK1E332AM: Panasonic FK series, active product status, identical electrical specifications, standard height 0.669" (17.00mm), suitable for high temperature reflow processes. Secondary substitute option.
EEV-FK1E332V: Panasonic FK series with anti-vibration construction, active product status, identical electrical specifications, reduced height 0.650" (16.50mm) provides additional clearance margin. Suitable for vibration-sensitive automotive environments.

Compatibility Notes for Panasonic Substitutes:

All three Panasonic alternatives feature surface mount land size of 0.748" L x 0.748" W (19.00mm x 19.00mm), which differs from the original AFK338M25R44B-F land size of 0.748" L x 0.827" W (19.00mm x 21.00mm). PCB pad pattern verification is required before implementation. Height specifications for all Panasonic parts (0.650" to 0.669") are within or below the original 0.669" maximum, ensuring board clearance compatibility.

Similar Substitute (General Purpose Applications):

EMVY250GRA332MMN0S: Chemi-Con Alchip™ MVY series, active product status, identical electrical specifications. This part does not carry AEC-Q200 automotive qualification and is classified for general purpose applications. Height of 0.846" (21.50mm) exceeds the original specification and requires verification of available board clearance. Ripple current ratings (1.3125 A @ 120 Hz, 1.75 A @ 100 kHz) are lower than the original and Panasonic alternatives; circuit current requirements must be verified. Impedance of 38 mOhms is slightly elevated compared to 33 mOhms baseline. Suitable only for non-automotive applications where clearance permits and ripple current requirements are within specified limits.

Selection Priority:

EEV-FK1E332M (Panasonic) for automotive applications with standard clearance
EEV-FK1E332V (Panasonic) for automotive applications requiring additional clearance margin
EEE-FK1E332AM (Panasonic) for automotive applications with high temperature reflow requirements
EMVY250GRA332MMN0S (Chemi-Con) for general purpose applications only, with clearance and ripple current verification

Frequently Asked Questions (FAQ)

Q: Can EEV-FK1E332M be used as a direct replacement for AFK338M25R44B-F in automotive applications?

A: Yes. EEV-FK1E332M meets all mandatory electrical specifications (3300 µF, 25 V, ±20% tolerance, 5000 Hrs @ 105°C) and carries AEC-Q200 automotive qualification identical to the original part. Physical dimensions (0.709" diameter, 0.669" height) are identical. PCB pad pattern differs slightly (0.748" L x 0.748" W vs. 0.748" L x 0.827" W); verify pad compatibility with board design before implementation.

Q: What is the difference between EEV-FK1E332M and EEV-FK1E332V?

A: Both parts are Panasonic FK series with identical electrical specifications and AEC-Q200 qualification. EEV-FK1E332V includes anti-vibration construction and has a reduced seated height of 0.650" (16.50mm) compared to 0.669" (17.00mm) for EEV-FK1E332M. Select EEV-FK1E332V for applications subject to mechanical vibration or where additional clearance margin is beneficial.

Q: Why is EMVY250GRA332MMN0S not recommended for automotive applications?

A: EMVY250GRA332MMN0S lacks AEC-Q200 automotive qualification, which is a mandatory requirement for automotive-grade components. Additionally, its seated height of 0.846" (21.50mm) exceeds the original specification of 0.669" (17.00mm), requiring clearance verification. Ripple current ratings are lower than the original part and Panasonic alternatives. This part is suitable only for general purpose applications where automotive qualification is not required.

Q: Are there any PCB layout considerations when substituting with Panasonic parts?

A: Yes. All Panasonic substitute parts feature surface mount land size of 0.748" L x 0.748" W (19.00mm x 19.00mm), which differs from the original AFK338M25R44B-F specification of 0.748" L x 0.827" W (19.00mm x 21.00mm). The pad pattern is narrower in one dimension. Verify that existing PCB pad patterns can accommodate this variation or require pad modification. Height specifications are compatible with or better than the original.

Q: What is the inventory status of substitute parts?

A: EEV-FK1E332M has the highest availability with 11,368 pcs in stock. EEE-FK1E332AM has 3433 pcs available. EEV-FK1E332V has 1223 pcs available. EMVY250GRA332MMN0S has 941 pcs available. All substitute parts are from active manufacturers with ongoing production.

Q: Can I use EMVY250GRA332MMN0S if my application is not automotive?

A: EMVY250GRA332MMN0S is suitable for general purpose applications where AEC-Q200 qualification is not required. Verify that circuit ripple current requirements do not exceed 1.3125 A @ 120 Hz or 1.75 A @ 100 kHz. Confirm that board clearance accommodates the 0.846" (21.50mm) seated height. If these conditions are met, this part provides a functional alternative.

Q: What does the ±20% tolerance mean for capacitance?

A: The ±20% tolerance indicates that the actual capacitance value may vary between 2640 µF and 3960 µF from the nominal 3300 µF specification. All substitute parts carry identical ±20% tolerance, ensuring equivalent performance variation characteristics.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed (EEE-FK1E332AM, EEV-FK1E332M, EEV-FK1E332V, and EMVY250GRA332MMN0S) are RoHS3 compliant and carry MSL 1 (Unlimited) moisture sensitivity rating, matching the original AFK338M25R44B-F specifications.

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