SEK103M010ST Equivalent & Substitute Parts Reference

Part Overview

The SEK103M010ST is a 10000 µF, 10 V aluminum electrolytic capacitor manufactured by Cornell Dubilier Electronics (CDE) in radial, can package configuration. This component is classified as Active product status and is designed for general-purpose applications requiring high capacitance energy storage in compact form factors.

Equivalent and substitute parts are necessary when the primary part becomes unavailable, when design requirements demand extended operational lifetime, when specific compliance certifications are required, or when alternative mechanical dimensions better suit revised PCB layouts. The substitute parts listed maintain the core electrical specifications (capacitance, voltage rating, tolerance, and polarization) while offering variations in lifetime ratings, ripple current handling, and physical dimensions.

Key Parameters

Parameter	Value	Unit	Substitution Relevance
Capacitance	10000	µF	Critical - must match exactly
Voltage - Rated	10 V (minimum)	V	Critical - substitute must meet or exceed
Tolerance	±20%	%	Critical - must match
Polarization	Polar	-	Critical - must match
Package / Case	Radial, Can	-	Critical - determines PCB compatibility
Mounting Type	Through Hole	-	Critical - must match
Lead Spacing	0.295" (7.50mm)	inches (mm)	Critical - determines footprint compatibility
Operating Temperature	-55°C ~ 105°C	°C	Important - substitute must cover range
Lifetime @ Temp.	2000 Hrs @ 105°C	Hours	Important - substitute may exceed
RoHS Status	ROHS3 Compliant	-	Important - regulatory requirement

Substitute Part Grouping Explanation

Substitution logic for the SEK103M010ST is based on strict equivalence of the following parameters:

Critical Matching Parameters:

Capacitance: 10000 µF (exact match required)
Tolerance: ±20% (exact match required)
Polarization: Polar (exact match required)
Package / Case: Radial, Can (exact match required)
Mounting Type: Through Hole (exact match required)
Lead Spacing: 0.295" (7.50mm) (exact match required)

Acceptable Variation Parameters:

Voltage - Rated: Substitute must be rated at 10 V or higher
Operating Temperature: Substitute must support -55°C ~ 105°C range
Lifetime @ Temp.: Substitute may equal or exceed 2000 Hrs @ 105°C
Physical Dimensions (Diameter, Height): Minor variations acceptable if lead spacing and mounting type remain unchanged
ESR and Ripple Current: Variations acceptable provided electrical performance meets application requirements

Compliance Parameters:

RoHS Status: All substitutes must maintain ROHS3 Compliance
REACH Status: All substitutes must maintain REACH Unaffected status

The three substitute parts listed (16PX10000MEFC16X31.5, UPW1A103MHD, EEU-FC1A103) satisfy all critical matching parameters and maintain regulatory compliance.

Parameter Comparison

Parameter	SEK103M010ST (CDE)	16PX10000MEFC16X31.5 (Rubycon)	UPW1A103MHD (Nichicon)	EEU-FC1A103 (Panasonic)
Capacitance	10000 µF	10000 µF	10000 µF	10000 µF
Tolerance	±20%	±20%	±20%	±20%
Voltage - Rated	10 V	16 V	10 V	10 V
Polarization	Polar	Polar	Polar	Polar
Package / Case	Radial, Can	Radial, Can	Radial, Can	Radial, Can
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
Lead Spacing	0.295" (7.50mm)	0.295" (7.50mm)	0.295" (7.50mm)	0.295" (7.50mm)
Operating Temperature	-55°C ~ 105°C	-55°C ~ 105°C	-55°C ~ 105°C	-55°C ~ 105°C
Lifetime @ Temp.	2000 Hrs @ 105°C	2000 Hrs @ 105°C	8000 Hrs @ 105°C	5000 Hrs @ 105°C
Size / Dimension (Dia)	0.709" (18.00mm)	0.630" (16.00mm)	0.709" (18.00mm)	0.709" (18.00mm)
Height - Seated (Max)	1.417" (36.00mm)	1.299" (33.00mm)	1.398" (35.50mm)	1.398" (35.50mm)
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected
Product Status	Active	Active	Not For New Designs	Active

Engineering Selection Recommendations

SEK103M010ST (Cornell Dubilier Electronics) - Primary Part

Use the original SEK103M010ST when available. This part maintains Active product status and is the baseline reference for all substitution decisions.

16PX10000MEFC16X31.5 (Rubycon) - Direct Substitute

The Rubycon PX series part is a direct electrical substitute with identical capacitance, tolerance, voltage rating, and lead spacing. The 16 V voltage rating exceeds the 10 V requirement, providing additional design margin. Physical dimensions are slightly smaller (0.630" diameter vs. 0.709"), which may allow for tighter PCB layouts. Lifetime rating matches the original at 2000 Hrs @ 105°C. This part is suitable for direct replacement in existing designs without circuit modification.

UPW1A103MHD (Nichicon) - Extended Lifetime Substitute

The Nichicon UPW series part matches all critical electrical parameters and maintains identical physical dimensions to the original. The extended lifetime rating of 8000 Hrs @ 105°C (versus 2000 Hrs) provides superior long-term reliability. However, this part carries "Not For New Designs" product status, indicating Nichicon has discontinued this line. Use only when extended operational lifetime is required and new design constraints do not apply. Higher ripple current capability (3.128 A @ 120 Hz vs. 1.98 A) indicates improved thermal performance.

EEU-FC1A103 (Panasonic Electronic Components) - Automotive-Qualified Substitute

The Panasonic FC series part is an Active product with AEC-Q200 automotive qualification rating. All critical electrical parameters match the original specification. The 5000 Hrs @ 105°C lifetime rating exceeds the original requirement. Physical dimensions match the original exactly (0.709" diameter, 1.398" height). This part is suitable for applications requiring automotive-grade component qualification or when extended operational lifetime is required in active product lines.

Selection Criteria Summary:

For standard replacement: Use 16PX10000MEFC16X31.5 (Rubycon) or EEU-FC1A103 (Panasonic)
For extended lifetime in legacy designs: Use UPW1A103MHD (Nichicon)
For automotive applications: Use EEU-FC1A103 (Panasonic)
For space-constrained layouts: Use 16PX10000MEFC16X31.5 (Rubycon)

All substitute parts maintain ROHS3 compliance and REACH Unaffected status, meeting current regulatory requirements.

Frequently Asked Questions (FAQ)

Q: Can I use the 16PX10000MEFC16X31.5 (Rubycon) as a direct replacement for SEK103M010ST?

A: Yes. The Rubycon part matches all critical electrical specifications: 10000 µF capacitance, ±20% tolerance, polar configuration, radial can package, through-hole mounting, and 0.295" (7.50mm) lead spacing. The 16 V voltage rating exceeds the 10 V requirement, providing additional design margin. The slightly smaller physical diameter (0.630" vs. 0.709") may require PCB layout verification to confirm clearance around the component footprint.

Q: Why does the Panasonic EEU-FC1A103 have a higher lifetime rating than the original?

A: The EEU-FC1A103 is rated for 5000 Hrs @ 105°C compared to the original 2000 Hrs @ 105°C. This reflects different internal construction and electrolyte formulation between manufacturers. Higher lifetime ratings indicate improved thermal stability and longer operational endurance under elevated temperature conditions. The Panasonic part's AEC-Q200 automotive qualification also contributes to enhanced reliability specifications.

Q: Can I use the Nichicon UPW1A103MHD in new product designs?

A: The UPW1A103MHD carries "Not For New Designs" product status from Nichicon, indicating this series has been discontinued. Use this part only in legacy product support, repair, or when extended lifetime requirements justify the use of discontinued components. For new designs, select either the Rubycon 16PX10000MEFC16X31.5 or Panasonic EEU-FC1A103.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All three substitute parts (16PX10000MEFC16X31.5, UPW1A103MHD, EEU-FC1A103) maintain ROHS3 Compliant status and REACH Unaffected status, meeting current regulatory requirements for electronic component manufacturing and distribution.

Q: What is the difference between the physical dimensions of these parts?

A: The SEK103M010ST, UPW1A103MHD, and EEU-FC1A103 share identical physical dimensions: 0.709" (18.00mm) diameter and approximately 1.4" height. The Rubycon 16PX10000MEFC16X31.5 is slightly smaller at 0.630" (16.00mm) diameter and 1.299" (33.00mm) height. All maintain the same 0.295" (7.50mm) lead spacing, ensuring footprint compatibility. Verify PCB clearance when substituting the Rubycon part due to its smaller diameter.

Q: Which substitute part should I select for automotive applications?

A: The Panasonic EEU-FC1A103 is the only substitute part with AEC-Q200 automotive qualification rating. Select this part for applications requiring automotive-grade component certification or when supplying to automotive OEMs with qualification requirements.

Q: Do all substitute parts have the same ripple current ratings?

A: No. The original SEK103M010ST is rated for 1.98 A @ 120 Hz and 2.376 A @ 10 kHz. The Rubycon 16PX10000MEFC16X31.5 is rated for 1.95 A @ 120 Hz and 2.2425 A @ 10 kHz. The Nichicon UPW1A103MHD and Panasonic EEU-FC1A103 are both rated for 3.128 A @ 120 Hz and 3.68 A @ 100 kHz. Higher ripple current ratings indicate improved thermal performance and ability to handle greater AC current stress without exceeding temperature limits.

Q: Can I substitute these parts interchangeably on the same PCB?

A: Yes, with one consideration. The Rubycon 16PX10000MEFC16X31.5 has a smaller diameter (0.630" vs. 0.709"), which may affect clearance with adjacent components or PCB features. Verify that the reduced diameter does not create interference with nearby components, mounting hardware, or board edge clearances. The other two substitutes (Nichicon and Panasonic) have identical dimensions to the original and require no layout verification.

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