Equivalent & Substitute Parts for 335CKS400MJM

Part Overview

The 335CKS400MJM is a 3.3 µF, 400 V aluminum electrolytic capacitor in radial, can package manufactured by Cornell Dubilier / Illinois Capacitor. This component is classified as Active product status and is designed for general purpose applications requiring through-hole mounting. The part features a 2000-hour lifetime rating at 85°C with an operating temperature range of -25°C to 85°C.

Equivalent and substitute parts are identified based on matching electrical specifications (capacitance, voltage rating, tolerance) and mechanical compatibility (lead spacing, package type, mounting configuration). Substitute selection becomes necessary when the primary part reaches end-of-life status, inventory constraints occur, or design requirements necessitate enhanced performance characteristics such as extended lifetime ratings or improved temperature operating ranges.

Key Parameters

Parameter	Value	Unit
Capacitance	3.3	µF
Voltage - Rated	400	V
Tolerance	±20%	-
Lead Spacing	0.138" (3.50 mm)	-
Size / Dimension	0.315" Dia (8.00 mm)	-
Height - Seated (Max)	0.512" (13.00 mm)	-
Mounting Type	Through Hole	-
Package / Case	Radial, Can	-
Lifetime @ Temp.	2000 Hrs @ 85°C	-
Operating Temperature	-25°C ~ 85°C	-
Polarization	Polar	-
RoHS Status	ROHS3 Compliant	-

Substitute Part Grouping Explanation

Substitution logic for the 335CKS400MJM is based on the following critical parameters that must remain constant or improve:

Mandatory Matching Parameters:

Capacitance: 3.3 µF (exact match required)
Voltage Rating: 400 V minimum (equal or higher acceptable)
Tolerance: ±20% (equal or tighter acceptable)
Lead Spacing: 0.138" (3.50 mm) (exact match required for PCB compatibility)
Package Type: Radial, Can (exact match required)
Mounting Type: Through Hole (exact match required)
Polarization: Polar (exact match required)

Performance Enhancement Parameters:

Lifetime @ Temperature: 2000 Hrs @ 85°C (equal or longer acceptable)
Operating Temperature Range: -25°C ~ 85°C (equal or wider acceptable)
RoHS Compliance: ROHS3 Compliant (maintained across all substitutes)

Substitute parts are categorized as Direct Manufacturer Substitutes (functionally equivalent with identical electrical and mechanical specifications) or Upgrade Substitutes (enhanced performance characteristics while maintaining core compatibility).

Parameter Comparison

Parameter	335CKS400MJM (Cornell Dubilier)	UVK2G3R3MPD (Nichicon)	400LEX3.3MEFC8X11.5 (Rubycon)	400LLE3R3MEFC8X11.5 (Rubycon)	450PK3R3MEFC8X11.5 (Rubycon)	EKXE401ELL3R3MHB5D (Chemi-Con)	ULD2G3R3MPD (Nichicon)
Capacitance	3.3 µF	3.3 µF	3.3 µF	3.3 µF	3.3 µF	3.3 µF	3.3 µF
Voltage - Rated	400 V	400 V	400 V	400 V	450 V	400 V	400 V
Tolerance	±20%	±20%	±20%	±20%	±20%	±20%	±20%
Lead Spacing	0.138" (3.50 mm)	0.138" (3.50 mm)	0.138" (3.50 mm)	0.138" (3.50 mm)	0.138" (3.50 mm)	0.138" (3.50 mm)	0.138" (3.50 mm)
Size / Dimension	0.315" Dia (8.00 mm)	0.315" Dia (8.00 mm)	0.315" Dia (8.00 mm)	0.315" Dia (8.00 mm)	0.315" Dia (8.00 mm)	0.315" Dia (8.00 mm)	0.315" Dia (8.00 mm)
Height - Seated (Max)	0.512" (13.00 mm)	0.492" (12.50 mm)	0.531" (13.50 mm)	0.512" (13.00 mm)	0.531" (13.50 mm)	0.531" (13.50 mm)	0.531" (13.50 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
Lifetime @ Temp.	2000 Hrs @ 85°C	2000 Hrs @ 85°C	5000 Hrs @ 125°C	15000 Hrs @ 105°C	2000 Hrs @ 85°C	10000 Hrs @ 105°C	15000 Hrs @ 105°C
Operating Temperature	-25°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 125°C	-40°C ~ 105°C	-25°C ~ 85°C	-40°C ~ 105°C	-40°C ~ 105°C
Polarization	Polar	Polar	Polar	Polar	Polar	Polar	Polar
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Active	Not For New Designs	Active	Active	Active	Active	Not For New Designs

Engineering Selection Recommendations

Direct Manufacturer Substitute - UVK2G3R3MPD (Nichicon):

The UVK2G3R3MPD provides electrical and mechanical equivalence to the 335CKS400MJM with identical capacitance, voltage rating, tolerance, and lead spacing. This part is suitable for direct replacement in existing designs. However, the product status is classified as "Not For New Designs," indicating this series is in mature phase. The UVK2G3R3MPD features a slightly reduced seated height of 0.492" (12.50 mm) compared to the main part's 0.512" (13.00 mm), which provides improved PCB clearance in space-constrained applications. Operating temperature range extends to -40°C, offering enhanced low-temperature performance.

Upgrade Substitute - 400LLE3R3MEFC8X11.5 (Rubycon):

The 400LLE3R3MEFC8X11.5 is recommended for applications requiring extended component lifetime. This part maintains identical electrical specifications (3.3 µF, 400 V, ±20%) and mechanical compatibility (lead spacing, package type) while providing 15000-hour lifetime rating at 105°C, compared to the main part's 2000-hour rating at 85°C. The seated height matches the main part at 0.512" (13.00 mm). Product status is Active, supporting new design implementations. Operating temperature range extends to -40°C ~ 105°C.

Upgrade Substitute - 400LEX3.3MEFC8X11.5 (Rubycon):

The 400LEX3.3MEFC8X11.5 offers enhanced thermal performance with 5000-hour lifetime at 125°C and extended operating temperature range to -40°C ~ 125°C. This part is suitable for applications exposed to elevated ambient temperatures or thermal cycling conditions. Seated height is 0.531" (13.50 mm), requiring verification of PCB clearance. Product status is Active.

Upgrade Substitute - EKXE401ELL3R3MHB5D (Chemi-Con):

The EKXE401ELL3R3MHB5D provides 10000-hour lifetime at 105°C with operating temperature range of -40°C ~ 105°C. This part maintains full electrical and mechanical compatibility with the main part. Seated height is 0.531" (13.50 mm). Product status is Active, supporting new design implementations.

Upgrade Substitute - ULD2G3R3MPD (Nichicon):

The ULD2G3R3MPD delivers 15000-hour lifetime at 105°C with operating temperature range of -40°C ~ 105°C. This part provides extended reliability equivalent to the 400LLE3R3MEFC8X11.5. However, product status is "Not For New Designs," and REACH Status is "REACH Affected," indicating regulatory considerations for new applications. Seated height is 0.531" (13.50 mm).

Higher Voltage Substitute - 450PK3R3MEFC8X11.5 (Rubycon):

The 450PK3R3MEFC8X11.5 provides voltage derating capability with 450 V rating while maintaining 3.3 µF capacitance and ±20% tolerance. This part is suitable for applications where voltage margin enhancement is required. Seated height is 0.531" (13.50 mm). Product status is Active. Operating temperature range is -25°C ~ 85°C, matching the main part's thermal envelope.

Frequently Asked Questions (FAQ)

Q: Can I substitute the 335CKS400MJM with a higher voltage rated capacitor such as the 450PK3R3MEFC8X11.5?

A: Yes. The 450PK3R3MEFC8X11.5 maintains identical capacitance (3.3 µF), tolerance (±20%), lead spacing (0.138" / 3.50 mm), and package type (Radial, Can). The higher voltage rating (450 V vs. 400 V) provides additional voltage margin without affecting circuit functionality. Verify that the increased seated height of 0.531" (13.50 mm) accommodates PCB layout constraints.

Q: What is the difference between Direct Manufacturer Substitutes and Upgrade Substitutes?

A: Direct Manufacturer Substitutes (such as UVK2G3R3MPD) provide electrical and mechanical equivalence with identical performance specifications. Upgrade Substitutes (such as 400LLE3R3MEFC8X11.5, 400LEX3.3MEFC8X11.5, EKXE401ELL3R3MHB5D) enhance one or more performance characteristics—typically lifetime rating or operating temperature range—while maintaining core electrical and mechanical compatibility.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed maintain ROHS3 Compliant status, consistent with the main part 335CKS400MJM. However, the ULD2G3R3MPD is marked as "REACH Affected," requiring evaluation for specific regulatory requirements in target markets.

Q: What does "Not For New Designs" product status mean?

A: "Not For New Designs" indicates that the manufacturer has classified the part as mature or in end-of-life phase. While the part remains functionally available, it is not recommended for incorporation into new product designs. Parts with this status include UVK2G3R3MPD and ULD2G3R3MPD. For new designs, select parts with "Active" product status: 400LEX3.3MEFC8X11.5, 400LLE3R3MEFC8X11.5, 450PK3R3MEFC8X11.5, or EKXE401ELL3R3MHB5D.

Q: How do I determine which substitute part is appropriate for my application?

A: Evaluate your application requirements against the following criteria: (1) Required lifetime rating at operating temperature; (2) Operating temperature range; (3) Available PCB clearance for seated height; (4) Voltage margin requirements; (5) Product status requirements for new designs. Match these requirements to the substitute part specifications provided in the Parameter Comparison table.

Q: Can the UVK2G3R3MPD be used as a direct drop-in replacement?

A: The UVK2G3R3MPD provides direct electrical equivalence and is mechanically compatible with identical lead spacing and package type. The seated height is 0.492" (12.50 mm), which is 0.020" (0.50 mm) shorter than the main part's 0.512" (13.00 mm). Verify that this height difference does not conflict with PCB layout or component clearance requirements.

Q: What is the significance of the extended operating temperature range in parts like 400LEX3.3MEFC8X11.5?

A: The 400LEX3.3MEFC8X11.5 operates from -40°C to 125°C, compared to the main part's -25°C to 85°C range. This extended range accommodates applications subject to extreme ambient temperatures, thermal cycling, or elevated internal component heating. The higher maximum temperature rating (125°C vs. 85°C) enables operation in thermally demanding environments.

Q: Are there any compliance or certification differences between substitute parts?

A: All substitute parts maintain ROHS3 Compliant and REACH Unaffected status, except ULD2G3R3MPD which is marked as "REACH Affected." All parts share identical ECCN (EAR99) and HTSUS (8532.22.0020) classifications. Verify REACH compliance requirements for your specific target market before selecting ULD2G3R3MPD.

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