337CKS035M

Part Overview

The 337CKS035M is an aluminum electrolytic capacitor manufactured by Cornell Dubilier / Illinois Capacitor, rated for 330 µF capacitance at 35 V with a ±20% tolerance. This radial can-style capacitor operates across a temperature range of -40°C to 85°C with a rated lifetime of 2000 hours at 85°C. The part is Active status and ROHS3 compliant.

Equivalent and substitute parts are necessary when the original component becomes unavailable, inventory constraints exist, or application requirements necessitate improved performance characteristics such as extended lifetime ratings or lower impedance values.

Key Parameters

Parameter	Specification
Capacitance	330 µF
Voltage Rating	35 V
Tolerance	±20%
ESR @ 120 Hz	603 mOhm
Lifetime @ Temperature	2000 Hrs @ 85°C
Operating Temperature	-40°C ~ 85°C
Ripple Current @ 120 Hz	580 mA
Lead Spacing	0.197" (5.00 mm)
Case Diameter	0.394" (10.00 mm)
Height Maximum	0.551" (14.00 mm)
Mounting Type	Through Hole
Package	Radial, Can
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the 337CKS035M are qualified based on the following critical parameters that must be maintained for functional equivalency:

Mandatory Equivalency Parameters:

Capacitance: 330 µF (±20% tolerance)
Voltage Rating: 35 V minimum
Polarization: Polar (aluminum electrolytic)
Lead Spacing: 0.197" (5.00 mm)
Case Diameter: 0.394" (10.00 mm)
Mounting Type: Through Hole
Package Type: Radial, Can

Performance Parameters Affecting Substitution Classification:

ESR (Equivalent Series Resistance): Lower values indicate improved high-frequency performance
Lifetime @ Temperature: Extended lifetimes at elevated temperatures provide increased reliability margins
Operating Temperature Range: Upper temperature limit determines thermal capability
Ripple Current Ratings: Higher values indicate superior AC stress handling capability

Substitute parts are grouped into two categories based on their performance relative to the main part:

Direct Substitutes maintain electrical and thermal specifications equivalent to the 337CKS035M, with minor variations in ripple current or ESR that do not limit application suitability.

Upgrade Substitutes provide enhanced performance characteristics including extended lifetime ratings (5000-10000 hours at 105°C), wider operating temperature ranges (-55°C to 105°C), or lower impedance values, suitable for applications demanding higher reliability or thermal margin.

Parameter Comparison

Part Number	Manufacturer	Capacitance	Voltage	ESR @ 120 Hz	Lifetime @ Temp.	Operating Temp.	Ripple Current @ 120 Hz	Height (Max)	Classification
337CKS035M	Cornell Dubilier / Illinois Capacitor	330 µF	35 V	603 mOhm	2000 Hrs @ 85°C	-40°C ~ 85°C	580 mA	0.551"	Reference
337CKE035M	Cornell Dubilier / Illinois Capacitor	330 µF	35 V	603 mOhm	2000 Hrs @ 105°C	-40°C ~ 105°C	420 mA	0.551"	Direct
B41821A7337M000	EPCOS - TDK Electronics	330 µF	35 V	700 mOhm	2000 Hrs @ 85°C	-40°C ~ 85°C	490 mA	0.531"	Direct
ECA-1VM331	Panasonic Electronic Components	330 µF	35 V	Not Specified	2000 Hrs @ 85°C	-40°C ~ 85°C	440 mA	0.531"	Direct
35YXJ330M10X12.5	Rubycon	330 µF	35 V	Not Specified	10000 Hrs @ 105°C	-40°C ~ 105°C	605.5 mA	0.551"	Upgrade
35ZLH330MEFC10X12.5	Rubycon	330 µF	35 V	39 mOhms	10000 Hrs @ 105°C	-40°C ~ 105°C	731.5 mA	0.551"	Upgrade
35ZLQ330MEFC10X12.5	Rubycon	330 µF	35 V	35 mOhms	5000 Hrs @ 105°C	-40°C ~ 105°C	808.5 mA	0.551"	Upgrade
35ZLS330MEFC10X12.5	Rubycon	330 µF	35 V	45 mOhms	6000 Hrs @ 105°C	-40°C ~ 105°C	682 mA	0.551"	Upgrade
ECA-1VHG331	Panasonic Electronic Components	330 µF	35 V	Not Specified	2000 Hrs @ 105°C	-55°C ~ 105°C	350 mA	0.531"	Upgrade
EEU-HD1V331	Panasonic Electronic Components	330 µF	35 V	Not Specified	2000 Hrs @ 105°C	-55°C ~ 105°C	350 mA	0.551"	Upgrade
ESH337M035AH1AA	KEMET	330 µF	35 V	Not Specified	2000 Hrs @ 105°C	-40°C ~ 105°C	Not Specified	0.531"	Upgrade

Engineering Selection Recommendations

Direct Substitutes (337CKE035M, B41821A7337M000, ECA-1VM331):

These parts maintain functional equivalency with the 337CKS035M across the core application envelope. All three maintain ROHS3 compliance and Active product status. The 337CKE035M from Cornell Dubilier shares identical ESR characteristics and extends the temperature rating to 105°C with equivalent lifetime at elevated temperature. The B41821A7337M000 from EPCOS maintains thermal performance comparable to the original with a 700 mOhm ESR and height advantage of 0.531". The ECA-1VM331 from Panasonic provides direct compatibility with Active status and ROHS3 compliance across a -40°C to 85°C range.

Upgrade Substitutes (Rubycon ZL-series, Panasonic ECA-1VHG331, EEU-HD1V331, KEMET ESH337M035AH1AA):

Upgrade parts are selected for applications requiring enhanced reliability or thermal margin. The Rubycon ZL-series capacitors (35ZLH330MEFC10X12.5, 35ZLQ330MEFC10X12.5, 35ZLS330MEFC10X12.5) deliver significantly extended lifetimes ranging from 5000 to 10000 hours at 105°C with substantially lower impedance values (35-45 mOhms) and higher ripple current capability. The Panasonic ECA-1VHG331 and EEU-HD1V331 extend the lower operating temperature limit to -55°C with lifetime extension to 105°C. The KEMET ESH337M035AH1AA provides 2000-hour lifetime at 105°C with ROHS3 compliance and Active status.

All substitute parts satisfy the mandatory equivalency parameters (330 µF, 35 V, 5.00 mm lead spacing, 10.00 mm diameter, through-hole radial can package). Height variations between 0.531" and 0.551" remain within acceptable PCB footprint tolerances for standard through-hole mounting. Selection between direct and upgrade substitutes depends on application-specific thermal and reliability requirements.

Frequently Asked Questions (FAQ)

Q: What electrical parameters must remain identical between the main part and a substitute?

A: The capacitance value (330 µF), voltage rating (35 V minimum), tolerance (±20%), lead spacing (5.00 mm), case diameter (10.00 mm), and mounting configuration (through-hole radial can) must match or exceed the original specification to maintain circuit compatibility.

Q: Can I use a substitute with lower ESR than the original?

A: Yes. Lower ESR values (measured in mOhms) indicate improved high-frequency performance and reduced thermal dissipation. Parts with ESR values below 603 mOhm represent performance improvements suitable for applications sensitive to impedance.

Q: What is the significance of lifetime rating differences?

A: Lifetime ratings specify the hours of operation at the stated temperature before capacitance degradation reaches ±20% of the initial value. Extended lifetimes (5000-10000 hours at 105°C versus 2000 hours at 85°C) provide increased operational margin in thermally demanding applications or systems with extended service intervals.

Q: Are there mounting compatibility concerns with height variations?

A: Height variations between 0.531" (13.50 mm) and 0.551" (14.00 mm) fall within standard through-hole PCB design clearances. Both dimensions accommodate typical component lead bending and mounting machine specifications without layout modifications.

Q: Which substitute is suitable for extended temperature operation?

A: The Panasonic ECA-1VHG331 and EEU-HD1V331 extend the lower operating temperature limit to -55°C, compared to -40°C for the original part. The Rubycon ZL-series and most upgrades extend upper temperature operation to 105°C.

Q: Can substitutes with "Not Specified" ESR be used safely?

A: Yes, substitutes with unspecified ESR values remain functionally compatible when all other electrical parameters (capacitance, voltage, tolerance) match the original. Manufacturers often do not publish ESR data for certain product lines while maintaining electrical performance within published tolerances.

Q: What is the difference between direct and upgrade classification?

A: Direct substitutes maintain equivalent electrical and thermal performance to the original part. Upgrade substitutes provide enhanced characteristics such as extended lifetime, lower impedance, higher ripple current capability, or wider temperature operation, suitable for applications with more demanding requirements.

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