337SAK6R3M Equivalent & Substitute Parts Reference

Part Overview

The 337SAK6R3M is a 330 µF, 6.3 V aluminum electrolytic capacitor manufactured by Cornell Dubilier / Illinois Capacitor in the SAK series. This radial, through-hole component is rated for 2000 hours at 85°C with an ESR of 1.407 Ohm @ 120 Hz and is designed for general-purpose applications. The part is currently active in production with 1154 units in stock.

Equivalent and substitute parts are necessary when the original 337SAK6R3M becomes unavailable, when design requirements demand enhanced performance characteristics such as extended lifetime or higher operating temperature ratings, or when alternative manufacturers' components meet the same electrical and mechanical specifications.

Key Parameters

Parameter	Value
Capacitance	330 µF
Voltage - Rated	6.3 V
Tolerance	±20%
ESR (Equivalent Series Resistance)	1.407 Ohm @ 120 Hz
Lifetime @ Temperature	2000 Hrs @ 85°C
Operating Temperature Range	-40°C ~ 85°C
Ripple Current @ 120 Hz	250 mA
Ripple Current @ 10 kHz	375 mA
Lead Spacing	0.098" (2.50 mm)
Case Diameter	0.248" (6.30 mm)
Height - Seated (Max)	0.413" (10.50 mm)
Mounting Type	Through Hole
Package / Case	Radial, Can
Polarization	Polar
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the 337SAK6R3M is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria (Must Match):

Capacitance: 330 µF (exact match required)
Voltage Rating: 6.3 V (exact match required)
Tolerance: ±20% (exact match required)
Polarization: Polar (exact match required)
Mounting Type: Through Hole (exact match required)
Package / Case: Radial, Can (exact match required)
Lead Spacing: 0.098" (2.50 mm) (exact match required)
Case Diameter: 0.248" (6.30 mm) (exact match required)

Secondary Compatibility Parameters (Must Not Exceed):

Height - Seated (Max): 0.413" (10.50 mm) — substitute parts may be equal or taller if PCB layout permits
Operating Temperature Range: -40°C ~ 85°C (minimum requirement)
RoHS Status: ROHS3 Compliant (required)

Performance Parameters (May Vary):

ESR, Ripple Current, Lifetime @ Temperature, and Impedance may differ between substitutes, provided the substitute meets or exceeds the performance envelope of the original part for the intended application.

Substitute parts are grouped into two categories: Direct Equivalents (matching all primary criteria at the same performance level) and Upgrades (matching all primary criteria with enhanced performance characteristics such as extended lifetime or higher temperature rating).

Parameter Comparison

Parameter	337SAK6R3M (Main)	UFW0J331MED	EKZE6R3ELL331MF11D	UFW1A331MED	UHE0J331MED	UKW1A331MED	UPW0J331MED
Manufacturer	Cornell Dubilier / Illinois Capacitor	Nichicon	Chemi-Con	Nichicon	Nichicon	Nichicon	Nichicon
Series	SAK	UFW	KZE	UFW	UHE	UKW	UPW
Capacitance	330 µF	330 µF	330 µF	330 µF	330 µF	330 µF	330 µF
Voltage - Rated	6.3 V	6.3 V	6.3 V	10 V	6.3 V	10 V	6.3 V
Tolerance	±20%	±20%	±20%	±20%	±20%	±20%	±20%
Lifetime @ Temperature	2000 Hrs @ 85°C	2000 Hrs @ 85°C	2000 Hrs @ 105°C	2000 Hrs @ 85°C	4000 Hrs @ 105°C	2000 Hrs @ 85°C	2000 Hrs @ 105°C
Operating Temperature Range	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 105°C	-40°C ~ 85°C	-40°C ~ 105°C	-40°C ~ 85°C	-55°C ~ 105°C
ESR (Equivalent Series Resistance)	1.407 Ohm @ 120 Hz	Not Specified	Not Specified	Not Specified	Not Specified	Not Specified	Not Specified
Ripple Current @ 120 Hz	250 mA	265 mA	202.5 mA	270 mA	238 mA	270 mA	188.5 mA
Ripple Current @ 10 kHz / 100 kHz	375 mA @ 10 kHz	397.5 mA @ 10 kHz	405 mA @ 100 kHz	405 mA @ 10 kHz	340 mA @ 100 kHz	405 mA @ 10 kHz	290 mA @ 100 kHz
Lead Spacing	0.098" (2.50 mm)	0.098" (2.50 mm)	0.098" (2.50 mm)	0.098" (2.50 mm)	0.098" (2.50 mm)	0.098" (2.50 mm)	0.098" (2.50 mm)
Case Diameter	0.248" (6.30 mm)	0.248" (6.30 mm)	0.248" (6.30 mm)	0.248" (6.30 mm)	0.248" (6.30 mm)	0.248" (6.30 mm)	0.248" (6.30 mm)
Height - Seated (Max)	0.413" (10.50 mm)	0.433" (11.00 mm)	0.433" (11.00 mm)	0.433" (11.00 mm)	0.433" (11.00 mm)	0.433" (11.00 mm)	0.433" (11.00 mm)
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	Radial, Can	Radial, Can	Radial, Can	Radial, Can	Radial, Can	Radial, Can	Radial, Can
Product Status	Active	Obsolete	Active	Obsolete	Obsolete	Obsolete	Obsolete
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Direct Equivalent (Same Performance Level):

UFW0J331MED (Nichicon, UFW series) is a direct equivalent to the 337SAK6R3M. Both parts share identical electrical specifications: 330 µF capacitance, 6.3 V rating, ±20% tolerance, 2000 hours lifetime at 85°C, and -40°C to 85°C operating temperature range. The UFW0J331MED has a marginally higher ripple current rating (265 mA @ 120 Hz versus 250 mA) and identical mechanical dimensions except for a 0.02" (0.50 mm) increase in seated height. The part is currently obsolete but has 3005 units in stock. This substitute is suitable for direct replacement in applications where the original part is unavailable.

Upgrade Options (Enhanced Performance):

EKZE6R3ELL331MF11D (Chemi-Con, KZE series) is an active-status upgrade offering extended lifetime (2000 hours @ 105°C versus 2000 hours @ 85°C) and higher maximum operating temperature (105°C versus 85°C). This part is recommended for applications requiring improved thermal performance or extended service life in elevated-temperature environments. The part has 3323 units in stock and is ROHS3 compliant.

UHE0J331MED (Nichicon, UHE series) is an obsolete upgrade providing the longest lifetime rating (4000 hours @ 105°C) and highest operating temperature range (-40°C to 105°C). This part is suitable for demanding applications requiring maximum reliability and thermal margin. The part has 13782 units in stock.

UPW0J331MED (Nichicon, UPW series) is an obsolete upgrade offering extended operating temperature range (-55°C to 105°C) and 2000 hours lifetime at 105°C. This part is recommended for applications requiring low-temperature operation capability. The part has 4863 units in stock.

Voltage-Upgraded Options:

UFW1A331MED and UKW1A331MED are 10 V rated variants of the 330 µF capacitor. These parts are electrically compatible with the 337SAK6R3M in applications where the circuit voltage is 6.3 V or lower, as the higher voltage rating provides additional safety margin. Both parts are obsolete but have substantial inventory (8857 and 2772 units respectively).

Compliance and Certification:

All substitute parts listed are ROHS3 compliant and REACH unaffected, matching the regulatory status of the original 337SAK6R3M. All parts carry the same ECCN (EAR99) and HTSUS (8532.22.0020) classifications.

Frequently Asked Questions (FAQ)

Q: Can UFW0J331MED be used as a direct replacement for 337SAK6R3M?

A: Yes. UFW0J331MED meets all primary substitution criteria: 330 µF capacitance, 6.3 V rating, ±20% tolerance, identical lead spacing (0.098" / 2.50 mm), identical case diameter (0.248" / 6.30 mm), through-hole radial mounting, and ROHS3 compliance. The seated height is 0.433" (11.00 mm) compared to 0.413" (10.50 mm) for the original part. Verify PCB layout clearance before substitution.

Q: What is the difference between direct equivalents and upgrades?

A: Direct equivalents such as UFW0J331MED match the original part's electrical performance specifications, including lifetime and operating temperature range. Upgrades such as EKZE6R3ELL331MF11D, UHE0J331MED, and UPW0J331MED provide enhanced performance characteristics such as extended lifetime (4000 hours versus 2000 hours) or higher maximum operating temperature (105°C versus 85°C), while maintaining compatibility with the original part's electrical and mechanical specifications.

Q: Are the 10 V rated parts (UFW1A331MED, UKW1A331MED) compatible with a 6.3 V circuit?

A: Yes. A 10 V rated capacitor can be used in a 6.3 V circuit. The higher voltage rating provides additional safety margin and does not affect circuit operation. However, verify that the application does not require the specific ESR or ripple current characteristics of the original 6.3 V part.

Q: What does the 0.02" (0.50 mm) height difference mean for PCB layout?

A: Most substitute parts have a maximum seated height of 0.433" (11.00 mm) compared to the original 337SAK6R3M at 0.413" (10.50 mm). This 0.02" increase is typically accommodated in standard PCB designs. However, verify clearance in applications with tight vertical constraints, such as low-profile enclosures or densely populated boards.

Q: Why are some substitute parts listed as obsolete?

A: Obsolete status indicates that the manufacturer has discontinued production of the part. However, these parts remain available through existing inventory channels. Obsolete parts such as UFW0J331MED, UFW1A331MED, UHE0J331MED, UKW1A331MED, and UPW0J331MED have substantial stock quantities (ranging from 2772 to 13782 units) and are suitable for current procurement. For long-term supply assurance, consider the active-status upgrade EKZE6R3ELL331MF11D.

Q: What is the significance of ESR (Equivalent Series Resistance)?

A: ESR affects the capacitor's ability to handle ripple current and its performance in high-frequency applications. The original 337SAK6R3M specifies 1.407 Ohm @ 120 Hz. Most substitute parts do not specify ESR in the provided data. If ESR is critical to the application, verify the substitute part's ESR specification with the manufacturer before substitution.

Q: Can I use EKZE6R3ELL331MF11D in place of 337SAK6R3M for general-purpose applications?

A: Yes. EKZE6R3ELL331MF11D is fully compatible with the 337SAK6R3M for general-purpose applications. The upgrade provides extended lifetime (2000 hours @ 105°C) and higher operating temperature range (-40°C to 105°C), which enhance reliability without compromising compatibility. This part is recommended for new designs or when the original part is unavailable.

Q: What are the RoHS and REACH compliance implications?

A: All substitute parts are ROHS3 compliant and REACH unaffected, matching the original 337SAK6R3M. This ensures compatibility with environmental regulations and procurement requirements in regulated industries.

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