SK3R3M350ST Equivalent & Substitute Parts Reference

Part Overview

The SK3R3M350ST is a 3.3 µF, 350 V aluminum electrolytic capacitor in radial, can package manufactured by Cornell Dubilier Electronics (CDE). This component is classified as Active product status and is designed for general-purpose applications requiring polar capacitive storage at moderate voltage levels. The part operates across a temperature range of -25°C to 85°C with a rated lifetime of 2000 hours at 85°C.

Equivalent and substitute parts are identified when design requirements permit voltage uprating, extended operational temperature ranges, or improved lifetime specifications while maintaining the same capacitance value, tolerance, and physical form factor.

Substiute Parts

SK3R3M350ST

Cornell Dubilier Electronics (CDE)In Stock: 1194SK3R3M350ST Datasheet

Current PartRFQ

UVR2G3R3MPD

NichiconIn Stock: 1662UVR2G3R3MPD Datasheet

DirectRFQ

450BXC3.3MEFC10X12.5

RubyconIn Stock: 1995450BXC3.3MEFC10X12.5 Datasheet

UpgradeRFQ

450PX3.3MEFC10X12.5

RubyconIn Stock: 2365450PX3.3MEFC10X12.5 Datasheet

UpgradeRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution logic for the SK3R3M350ST is based on the following criteria:

Mandatory Matching Parameters:

• Capacitance: 3.3 µF (exact match required)
• Tolerance: ±20% (exact match required)
• Polarization: Polar (exact match required)
• Package / Case: Radial, Can (exact match required)
• Lead Spacing: 0.197" (5.00mm) (exact match required)
• Size / Dimension: 0.394" Dia (10.00mm) (exact match required)
• Mounting Type: Through Hole (exact match required)

Allowable Upgrade Parameters:

• Voltage - Rated: Substitute voltage must be equal to or greater than 350 V
• Operating Temperature: Substitute range must encompass the original -25°C to 85°C range
• Lifetime @ Temp.: Substitute lifetime must meet or exceed 2000 Hrs @ 85°C
• Height - Seated (Max): Substitute height must not exceed 0.591" (15.00mm) to ensure PCB clearance compatibility

Compliance Requirements:

• RoHS Status: ROHS3 Compliant (maintained across all substitutes)
• REACH Status: REACH Unaffected (maintained across all substitutes)

Three substitute parts meet these criteria with voltage uprating and/or extended lifetime specifications.

Parameter Comparison

Engineering Selection Recommendations

Primary Selection: 450BXC3.3MEFC10X12.5 (Rubycon BXC Series)

The 450BXC3.3MEFC10X12.5 is the preferred substitute when design specifications permit voltage uprating and extended operational temperature range. This part provides:

• Voltage uprating from 350 V to 450 V
• Extended operating temperature to 105°C
• Significantly extended lifetime: 8000 Hrs @ 105°C versus 2000 Hrs @ 85°C
• Active product status suitable for new designs
• ROHS3 compliance maintained
• Physical dimensions compatible with SK3R3M350ST mounting footprint (height reduced to 14.50mm)

Secondary Selection: 450PX3.3MEFC10X12.5 (Rubycon PX Series)

The 450PX3.3MEFC10X12.5 serves as an alternative when the extended lifetime of the BXC series is not required. This part provides:

• Voltage uprating from 350 V to 450 V
• Extended operating temperature to 105°C
• Active product status suitable for new designs
• ROHS3 compliance maintained
• Physical dimensions compatible with SK3R3M350ST mounting footprint (height reduced to 14.50mm)

Tertiary Selection: UVR2G3R3MPD (Nichicon UVR Series)

The UVR2G3R3MPD is available as a substitute when voltage uprating to 400 V is sufficient and extended temperature operation is not required. This part provides:

• Voltage uprating from 350 V to 400 V
• Extended lower temperature operation to -40°C
• Lifetime specification matches original: 2000 Hrs @ 85°C
• Product status is Not For New Designs; use only for replacement applications
• ROHS3 compliance maintained
• Physical dimensions compatible with SK3R3M350ST mounting footprint (height reduced to 14.00mm)

Compliance Verification:

All substitute parts maintain ROHS3 compliance and REACH Unaffected status, ensuring regulatory alignment with the original SK3R3M350ST component.

Frequently Asked Questions (FAQ)

Q: Can the UVR2G3R3MPD be used in new product designs?

A: The UVR2G3R3MPD carries a product status designation of "Not For New Designs." This part is suitable only for replacement or repair of existing equipment. For new designs, select either the 450BXC3.3MEFC10X12.5 or 450PX3.3MEFC10X12.5, both of which carry Active product status.

Q: What is the physical compatibility between the SK3R3M350ST and its substitutes?

A: All substitute parts maintain the same lead spacing (0.197" / 5.00mm) and diameter (0.394" / 10.00mm) as the original SK3R3M350ST. However, the substitute parts have reduced seated heights: UVR2G3R3MPD at 0.551" (14.00mm), and both Rubycon parts at 0.571" (14.50mm), compared to the original 0.591" (15.00mm). These reduced heights provide additional PCB clearance margin and are fully compatible with the original mounting footprint.

Q: Can I use a 450 V rated capacitor in place of a 350 V rated capacitor?

A: Yes. Voltage uprating is an allowable substitution parameter. A capacitor rated for 450 V can be used in an application designed for 350 V operation. The higher voltage rating provides additional safety margin and does not negatively impact circuit performance at the lower operating voltage.

Q: What is the difference between the 450BXC3.3MEFC10X12.5 and 450PX3.3MEFC10X12.5?

A: Both parts are manufactured by Rubycon and share identical electrical specifications (3.3 µF, 450 V, ±20% tolerance). The primary difference is lifetime rating: the BXC series provides 8000 Hrs @ 105°C, while the PX series provides 2000 Hrs @ 105°C. Select the BXC series for applications requiring extended operational life; select the PX series for standard lifetime requirements.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed—UVR2G3R3MPD, 450BXC3.3MEFC10X12.5, and 450PX3.3MEFC10X12.5—carry ROHS3 Compliant status, matching the compliance level of the original SK3R3M350ST.

Q: What does "Not For New Designs" mean for the UVR2G3R3MPD?

A: This designation indicates that the UVR2G3R3MPD is in a mature or end-of-life phase in the manufacturer's product portfolio. While the part remains available and functional, Nichicon does not recommend its use in newly developed products. The part is suitable for field replacement, repair, or maintenance of existing equipment. For new product development, use the Rubycon alternatives (450BXC3.3MEFC10X12.5 or 450PX3.3MEFC10X12.5).

Q: Can I substitute based on ESR (Equivalent Series Resistance) values?

A: ESR data is not uniformly provided across all substitute parts in this reference. The original SK3R3M350ST specifies 80.42 Ohm @ 120Hz. ESR values for the substitute parts are not documented in the provided specifications. If ESR performance is critical to your application, contact the respective manufacturers (Nichicon or Rubycon) for detailed ESR specifications before final component selection.

Q: What is the ripple current rating for each substitute?

A: Ripple current specifications vary by part. The UVR2G3R3MPD provides 55 mA @ 120 Hz and 88 mA @ 10 kHz. The 450PX3.3MEFC10X12.5 provides 33 mA @ 120 Hz and 33 mA @ 10 kHz. The 450BXC3.3MEFC10X12.5 does not provide ripple current specifications in the available data. If ripple current performance is a design constraint, verify the selected substitute meets your application requirements.