AFK336M25C12B-F Equivalent & Substitute Parts

Part Overview

The AFK336M25C12B-F is a 33 µF, 25 V aluminum electrolytic capacitor manufactured by Cornell Dubilier Electronics (CDE) in surface mount radial can package. This component is rated for automotive applications with AEC-Q200 compliance and operates across -55°C to 105°C with a 2000-hour lifetime at 105°C. The part is currently obsolete, necessitating identification of active equivalent alternatives that maintain electrical and mechanical compatibility for new designs or production continuity.

Key Parameters

Parameter	Value
Capacitance	33 µF
Voltage Rating	25 V
Tolerance	±20%
ESR @ 100 kHz	700 mOhm
Lifetime @ 105°C	2000 Hrs
Operating Temperature Range	-55°C ~ 105°C
Ripple Current @ 100 kHz	160 mA
Ripple Current @ 120 Hz	120 mA
Package Type	Radial, Can - SMD
Physical Diameter	0.197" (5.00 mm)
Physical Height	0.240" (6.10 mm)
Mounting Type	Surface Mount
AEC-Q200 Compliance	Yes
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the AFK336M25C12B-F is determined by strict equivalence across the following electrical and mechanical parameters:

Electrical Equivalence Criteria:

Capacitance: 33 µF (exact match required)
Voltage Rating: 25 V (exact match required)
Tolerance: ±20% (exact match required)
Operating Temperature Range: -55°C ~ 105°C (exact match required)
Lifetime: 2000 Hrs @ 105°C (exact match required)
Ripple Current @ 100 kHz: 160 mA (exact match required)
Ripple Current @ 120 Hz: 120 mA (exact match required)

Mechanical Equivalence Criteria:

Package Type: Radial, Can - SMD (exact match required)
Physical Diameter: 0.197" (5.00 mm) (exact match required)
Physical Height: 0.240" (6.10 mm) (exact match required)
Mounting Type: Surface Mount (exact match required)

Compliance Criteria:

RoHS3 Compliance (required)
Moisture Sensitivity Level 1 (required)

Substitute parts are grouped into two categories: direct manufacturer equivalents from CDE and cross-manufacturer alternatives that meet all electrical and mechanical specifications. ESR values and impedance characteristics are secondary parameters that may vary within acceptable ranges for the application category.

Parameter Comparison

Parameter	AFK336M25C12B-F (Main)	AFK336M25C12T-F	EEE-FK1E330UR	EEE-FKE330UAR	EMZA250ARA330ME61G	UCL1E330MCL6GS
Manufacturer	Cornell Dubilier Electronics	Cornell Dubilier Electronics	Panasonic Electronic Components	Panasonic Electronic Components	Chemi-Con	Nichicon
Capacitance	33 µF	33 µF	33 µF	33 µF	33 µF	33 µF
Voltage Rating	25 V	25 V	25 V	25 V	25 V	25 V
Tolerance	±20%	±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	-55°C ~ 105°C
Lifetime @ 105°C	2000 Hrs	2000 Hrs	2000 Hrs	2000 Hrs	2000 Hrs	2000 Hrs
Ripple Current @ 100 kHz	160 mA	160 mA	160 mA	160 mA	160 mA	240 mA
Ripple Current @ 120 Hz	120 mA	120 mA	120 mA	104 mA	64 mA	120 mA
ESR @ 100 kHz	700 mOhm	700 mOhm	Not Specified	Not Specified	Not Specified	Not Specified
Impedance	700 mOhms	700 mOhms	700 mOhms	700 mOhms	700 mOhms	360 mOhms
Physical Diameter	0.197" (5.00 mm)	0.197" (5.00 mm)	0.197" (5.00 mm)	0.197" (5.00 mm)	0.197" (5.00 mm)	0.197" (5.00 mm)
Physical Height	0.240" (6.10 mm)	0.240" (6.10 mm)	0.240" (6.10 mm)	0.240" (6.10 mm)	0.240" (6.10 mm)	0.228" (5.80 mm)
Surface Mount Land Size	0.209" L x 0.256" W (5.30mm x 6.50mm)	0.209" L x 0.256" W (5.30mm x 6.50mm)	0.209" L x 0.209" W (5.30mm x 5.30mm)	0.209" L x 0.209" W (5.30mm x 5.30mm)	0.209" L x 0.209" W (5.30mm x 5.30mm)	0.209" L x 0.209" W (5.30mm x 5.30mm)
Package Type	Radial, Can - SMD	Radial, Can - SMD	Radial, Can - SMD	Radial, Can - SMD	Radial, Can - SMD	Radial, Can - SMD
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Product Status	Obsolete	Active	Active	Active	Active	Active
AEC-Q200 Compliance	Yes	Yes	Yes	Yes	Yes	Not Specified
RoHS3 Compliance	Yes	Yes	Yes	Yes	Yes	Yes
MSL Rating	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

Primary Recommendation: AFK336M25C12T-F

The AFK336M25C12T-F is the direct equivalent from Cornell Dubilier Electronics, differing only in packaging format (Tape & Reel versus cut tape). This part maintains identical electrical specifications, physical dimensions, and compliance ratings. Product status is active with substantial inventory availability (9,333 pcs). This selection eliminates any cross-manufacturer compatibility concerns and preserves the original design intent.

Secondary Recommendations: Panasonic EEE-FK Series

The EEE-FK1E330UR and EEE-FKE330UAR from Panasonic Electronic Components are active alternatives meeting all core electrical and mechanical requirements. Both maintain 33 µF capacitance, 25 V rating, 2000-hour lifetime at 105°C, and AEC-Q200 compliance. Physical dimensions and surface mount land patterns are compatible. The EEE-FKE330UAR includes high-temperature reflow capability. These parts are suitable for automotive applications with established supply chain availability.

Tertiary Recommendation: EMZA250ARA330ME61G

The EMZA250ARA330ME61G from Chemi-Con (Alchip™ MZA series) meets electrical and mechanical specifications with AEC-Q200 compliance. Ripple current at 120 Hz is reduced (64 mA versus 120 mA), which may be acceptable depending on circuit requirements. This part is active with moderate inventory (949 pcs).

Alternative with Enhanced Performance: UCL1E330MCL6GS

The UCL1E330MCL6GS from Nichicon provides superior ripple current handling (240 mA @ 100 kHz versus 160 mA) and lower impedance (360 mOhms versus 700 mOhms). Physical height is reduced to 0.228" (5.80 mm). This part does not carry AEC-Q200 certification and is rated for general purpose applications rather than automotive. Selection of this part requires design review to confirm suitability for the intended application context.

Compliance Considerations:

All recommended substitutes maintain ROHS3 compliance and MSL Level 1 rating. For automotive applications, AEC-Q200 certification is a critical selection parameter. The AFK336M25C12T-F, EEE-FK1E330UR, EEE-FKE330UAR, and EMZA250ARA330ME61G all carry this certification. The UCL1E330MCL6GS lacks AEC-Q200 certification and should be used only in non-automotive contexts or where automotive qualification is not required.

Frequently Asked Questions (FAQ)

Q: Can the AFK336M25C12T-F directly replace the AFK336M25C12B-F?

A: Yes. The AFK336M25C12T-F is electrically and mechanically identical to the AFK336M25C12B-F. The only difference is packaging format: the T-suffix indicates Tape & Reel packaging, while the B-suffix indicates cut tape. Both are surface mount radial can packages with identical land patterns and dimensions. The T-suffix part is active and recommended for production use.

Q: Are cross-manufacturer substitutes suitable for automotive applications?

A: Cross-manufacturer substitutes from Panasonic (EEE-FK1E330UR, EEE-FKE330UAR) and Chemi-Con (EMZA250ARA330ME61G) are suitable for automotive applications. All three carry AEC-Q200 compliance certification, matching the original part's automotive qualification. The Nichicon UCL1E330MCL6GS does not carry AEC-Q200 certification and is not recommended for automotive use.

Q: What is the significance of the different surface mount land sizes?

A: The AFK336M25C12B-F specifies a land size of 0.209" L x 0.256" W (5.30mm x 6.50mm), while most substitute parts specify 0.209" L x 0.209" W (5.30mm x 5.30mm). The original part has a rectangular land pattern, while substitutes have square patterns. PCB layout must accommodate the specific land pattern of the selected part. If the original PCB is designed for the rectangular pattern, the AFK336M25C12T-F maintains compatibility. Cross-manufacturer parts with square land patterns require PCB redesign or use of adapter footprints.

Q: How do ripple current specifications affect part selection?

A: Ripple current ratings define the maximum AC current the capacitor can handle at specified frequencies without exceeding temperature limits. The main part and most substitutes handle 160 mA @ 100 kHz and 120 mA @ 120 Hz. The EEE-FKE330UAR handles 104 mA @ 120 Hz (reduced), and the EMZA250ARA330ME61G handles 64 mA @ 120 Hz (significantly reduced). The UCL1E330MCL6GS handles 240 mA @ 100 kHz (enhanced). Selection depends on actual circuit ripple current requirements. If the circuit requires 120 mA @ 120 Hz, the reduced-rating parts may not be suitable.

Q: What does ESR (Equivalent Series Resistance) mean for this application?

A: ESR represents the internal resistance of the capacitor at a specified frequency (100 kHz in this case). The main part and AFK336M25C12T-F specify 700 mOhm ESR. Lower ESR improves performance in high-frequency bypass and decoupling applications by reducing voltage ripple and heat generation. The UCL1E330MCL6GS offers lower ESR (360 mOhms), providing superior performance in these applications. Most cross-manufacturer substitutes do not specify ESR values, indicating they meet the 700 mOhm specification or better.

Q: Is the height difference between the main part and UCL1E330MCL6GS significant?

A: The UCL1E330MCL6GS has a seated height of 0.228" (5.80 mm) compared to 0.240" (6.10 mm) for the main part. This 0.012" (0.30 mm) reduction is generally not significant for most PCB designs. However, if the original design has tight vertical clearance constraints (such as under a shield can or in a confined space), the reduced height may provide additional clearance. Conversely, if the PCB footprint is designed for the taller part, the shorter substitute may not make full contact with the solder pads.

Q: What is the difference between the EEE-FK1E330UR and EEE-FKE330UAR?

A: Both parts are 33 µF, 25 V Panasonic capacitors with identical electrical specifications and physical dimensions. The EEE-FKE330UAR includes high-temperature reflow capability, making it suitable for applications requiring multiple reflow cycles or elevated processing temperatures. The EEE-FK1E330UR is the standard version. For single-reflow applications, either part is acceptable. For manufacturing processes with multiple thermal cycles, the EEE-FKE330UAR is preferred.

Q: Can I use the UCL1E330MCL6GS in an automotive circuit?

A: The UCL1E330MCL6GS does not carry AEC-Q200 certification and is rated for general purpose applications. Automotive applications typically require AEC-Q200 compliance for reliability and qualification purposes. Use of non-certified parts in automotive designs requires explicit engineering justification and may violate design standards or customer specifications. For automotive applications, select from AEC-Q200 certified alternatives: AFK336M25C12T-F, EEE-FK1E330UR, EEE-FKE330UAR, or EMZA250ARA330ME61G.

Q: What inventory considerations should guide my selection?

A: Inventory availability varies significantly among substitutes. The AFK336M25C12T-F has the highest availability (9,333 pcs), followed by UCL1E330MCL6GS (9,683 pcs), EEE-FK1E330UR (5,300 pcs), EEE-FKE330UAR (2,622 pcs), and EMZA250ARA330ME61G (949 pcs). For high-volume production, the AFK336M25C12T-F or UCL1E330MCL6GS offer the best supply security. For lower-volume applications, all alternatives have sufficient stock. Lead time and supply chain stability should be evaluated with component distributors.

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