AFK337M16F24B-F Equivalent & Substitute Parts

Part Overview

The AFK337M16F24B-F is a 330 µF, 16 V aluminum electrolytic capacitor manufactured by Cornell Dubilier Electronics (CDE) in a surface mount radial can package. This component is rated for automotive applications with AEC-Q200 qualification and operates across a temperature range of -55°C to 105°C with a 2000-hour lifetime at 105°C. The part is discontinued at DiGi Electronics, necessitating identification of equivalent alternatives that maintain electrical and mechanical compatibility for existing designs.

Key Parameters

Parameter	Value
Capacitance	330 µF
Voltage Rating	16 V
Tolerance	±20%
ESR @ 100 kHz	160 mOhm
Lifetime @ 105°C	2000 Hrs
Operating Temperature Range	-55°C to 105°C
Ripple Current @ 100 kHz	600 mA
Package Type	Radial, Can - SMD
Case Diameter	0.315" (8.00 mm)
Case Height	0.413" (10.50 mm)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
MSL Rating	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the AFK337M16F24B-F is determined by strict equivalence across the following critical parameters:

Electrical Equivalence Requirements:

Capacitance: 330 µF (exact match)
Voltage Rating: 16 V (exact match)
Tolerance: ±20% (exact match)
Lifetime: 2000 Hrs @ 105°C (exact match)
Operating Temperature: -55°C to 105°C (exact match)
Impedance: 160 mOhms (exact match for automotive-grade substitutes)

Mechanical Equivalence Requirements:

Package Type: Radial, Can - SMD (exact match)
Case Diameter: 0.315" (8.00 mm) (exact match)
Case Height: 0.413" (10.50 mm) (exact match)
Mounting Type: Surface Mount (exact match)
MSL Rating: 1 (Unlimited) (exact match)

Compliance Requirements:

RoHS3 Compliant (required)
AEC-Q200 rated (required for automotive applications)

Substitute parts are categorized as Direct Equivalents when all electrical, mechanical, and compliance parameters match the main part. Parts with variations in ripple current, impedance, or application classification are noted for specific use case evaluation.

Parameter Comparison

Parameter	AFK337M16F24B-F (CDE)	EEE-FK1C331AP (Panasonic)	EEE-FK1C331P (Panasonic)	EMZA160ARA331MHA0G (Chemi-Con)	UCL1C331MNL1GS (Nichicon)	EMVY160ARA331MHA0G (Chemi-Con)
Capacitance	330 µF	330 µF	330 µF	330 µF	330 µF	330 µF
Voltage Rating	16 V	16 V	16 V	16 V	16 V	16 V
Tolerance	±20%	±20%	±20%	±20%	±20%	±20%
ESR / Impedance @ 100 kHz	160 mOhm	160 mOhm	160 mOhm	160 mOhm	80 mOhm	300 mOhm
Lifetime @ 105°C	2000 Hrs	2000 Hrs	2000 Hrs	2000 Hrs	2000 Hrs	2000 Hrs
Operating Temperature	-55°C to 105°C	-55°C to 105°C	-55°C to 105°C	-55°C to 105°C	-55°C to 105°C	-55°C to 105°C
Ripple Current @ 120 Hz	450 mA	390 mA	450 mA	300 mA	425 mA	225 mA
Ripple Current @ 100 kHz	600 mA	600 mA	600 mA	600 mA	850 mA	450 mA
Case Diameter	0.315" (8.00 mm)	0.315" (8.00 mm)	0.315" (8.00 mm)	0.315" (8.00 mm)	0.315" (8.00 mm)	0.315" (8.00 mm)
Case Height	0.413" (10.50 mm)	0.413" (10.50 mm)	0.413" (10.50 mm)	0.413" (10.50 mm)	0.394" (10.00 mm)	0.394" (10.00 mm)
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
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
AEC-Q200 Rated	Yes	Yes	Yes	Yes	No	No
Product Status	Discontinued	Active	Active	Active	Active	Active

Engineering Selection Recommendations

Tier 1 - Direct Automotive Equivalents (AEC-Q200 Rated):

EEE-FK1C331P (Panasonic) and EEE-FK1C331AP (Panasonic) are direct electrical and mechanical equivalents with identical impedance (160 mOhm), matching ripple current specifications at 100 kHz (600 mA), and AEC-Q200 automotive qualification. Both parts are active in production with substantial inventory availability. EEE-FK1C331P provides the closest match to the original ripple current specification at 120 Hz (450 mA). These parts are suitable for direct substitution in automotive applications requiring AEC-Q200 compliance.

EMZA160ARA331MHA0G (Chemi-Con Alchip™-MZA series) maintains identical electrical parameters and AEC-Q200 qualification with matching impedance (160 mOhm) and high-frequency ripple current (600 mA). This part is active with good inventory availability and represents a qualified alternative for automotive designs.

Tier 2 - General Purpose Alternatives (Non-Automotive Rated):

UCL1C331MNL1GS (Nichicon) provides superior high-frequency ripple current capability (850 mA @ 100 kHz) and lower impedance (80 mOhm) compared to the original specification. However, this part lacks AEC-Q200 automotive qualification and is classified for general purpose applications. Case height is 0.394" (10.00 mm) versus the original 0.413" (10.50 mm), requiring PCB layout verification. This part is suitable only for non-automotive applications or where automotive qualification is not required.

EMVY160ARA331MHA0G (Chemi-Con Alchip™-MVY series) exhibits reduced ripple current capability at both 120 Hz (225 mA) and 100 kHz (450 mA), and elevated impedance (300 mOhm) relative to the original specification. This part lacks AEC-Q200 qualification and is classified for general purpose applications. Case height is 0.394" (10.00 mm). This part is not recommended as a substitute for the AFK337M16F24B-F in automotive or high-ripple-current applications.

Frequently Asked Questions (FAQ)

Q: Can EEE-FK1C331P and EEE-FK1C331AP be used interchangeably with the AFK337M16F24B-F?

A: Both Panasonic parts are direct equivalents for the AFK337M16F24B-F in automotive applications. They match all critical electrical parameters (330 µF, 16 V, ±20%, 160 mOhm impedance, 2000 Hrs @ 105°C) and maintain AEC-Q200 qualification. Both are surface mount radial can packages with identical case dimensions (0.315" diameter × 0.413" height). The primary difference is packaging format: EEE-FK1C331P is supplied in Tape & Reel format with higher inventory availability (7591 pcs). Both parts are suitable for direct PCB substitution without design modification.

Q: What is the significance of the impedance (ESR) parameter in selecting a substitute?

A: Impedance directly affects capacitor performance in ripple current applications and high-frequency filtering circuits. The original AFK337M16F24B-F specifies 160 mOhm impedance at 100 kHz. Substitute parts with matching impedance (EEE-FK1C331P, EEE-FK1C331AP, EMZA160ARA331MHA0G) maintain equivalent electrical performance. UCL1C331MNL1GS offers lower impedance (80 mOhm), which improves ripple current handling but may alter circuit behavior in sensitive applications. EMVY160ARA331MHA0G exhibits higher impedance (300 mOhm), reducing ripple current capability and increasing voltage drop under load. For direct substitution, impedance matching is critical.

Q: Why do some substitute parts have different case heights?

A: UCL1C331MNL1GS and EMVY160ARA331MHA0G have a case height of 0.394" (10.00 mm) compared to the original 0.413" (10.50 mm). This 0.5 mm difference may affect PCB layout clearance, component stacking, and mechanical assembly. Before substituting these parts, verify that the reduced height does not create clearance issues with adjacent components, conformal coatings, or enclosure constraints. The Panasonic and Chemi-Con Alchip™-MZA alternatives maintain the original 0.413" (10.50 mm) height and require no layout modification.

Q: Is AEC-Q200 qualification required for all applications?

A: AEC-Q200 qualification is mandatory for automotive applications, including engine compartment, underbody, and safety-critical circuits. The original AFK337M16F24B-F carries AEC-Q200 qualification. For direct automotive substitution, select only EEE-FK1C331P, EEE-FK1C331AP, or EMZA160ARA331MHA0G, which maintain this qualification. UCL1C331MNL1GS and EMVY160ARA331MHA0G lack AEC-Q200 certification and are classified for general purpose use. These parts are not suitable for automotive applications requiring qualification compliance.

Q: What is the difference between ripple current at 120 Hz and 100 kHz?

A: Ripple current specifications at different frequencies characterize capacitor performance under varying load conditions. Low-frequency ripple current (120 Hz) represents power supply ripple in AC-to-DC conversion circuits. High-frequency ripple current (100 kHz) represents switching noise in DC-DC converters and high-frequency switching applications. The original AFK337M16F24B-F handles 450 mA @ 120 Hz and 600 mA @ 100 kHz. EEE-FK1C331P matches both specifications exactly. EEE-FK1C331AP provides 390 mA @ 120 Hz (slightly reduced) but maintains 600 mA @ 100 kHz. For applications with demanding low-frequency ripple current requirements, EEE-FK1C331P is preferred.

Q: Can UCL1C331MNL1GS be used in automotive applications?

A: No. UCL1C331MNL1GS lacks AEC-Q200 automotive qualification and is classified for general purpose applications. While the part meets the electrical specifications (330 µF, 16 V, ±20%, 2000 Hrs @ 105°C), it does not carry automotive-grade certification. Use of non-qualified components in automotive circuits may violate design standards and regulatory requirements. For automotive applications, select only AEC-Q200 qualified alternatives: EEE-FK1C331P, EEE-FK1C331AP, or EMZA160ARA331MHA0G.

Q: What does MSL 1 (Unlimited) mean for moisture sensitivity?

A: MSL (Moisture Sensitivity Level) 1 indicates the lowest moisture sensitivity classification. MSL 1 (Unlimited) means the component has no moisture sensitivity restrictions and does not require special handling, baking, or storage conditions prior to soldering. All substitute parts listed carry MSL 1 (Unlimited) rating, matching the original AFK337M16F24B-F. This simplifies supply chain management and assembly processes without requiring specialized moisture control procedures.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed (EEE-FK1C331P, EEE-FK1C331AP, EMZA160ARA331MHA0G, UCL1C331MNL1GS, EMVY160ARA331MHA0G) are ROHS3 compliant, matching the original AFK337M16F24B-F. ROHS3 compliance certifies that the components contain no restricted substances (lead, cadmium, mercury, hexavalent chromium, polybrominated biphenyls, or polybrominated diphenyl ethers) and meet environmental regulations for electronic equipment manufacturing and disposal.

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