SH331M6R3ST Equivalent & Substitute Parts Reference

Part Overview

The SH331M6R3ST is a 330 µF, 6.3 V aluminum electrolytic capacitor manufactured by Cornell Dubilier Electronics (CDE) in radial, can package configuration. This component is classified as obsolete, indicating it is no longer in active production. The part operates across a temperature range of -40°C to 105°C with a rated lifetime of 2000 hours at 105°C, suitable for general-purpose applications requiring stable capacitance and low equivalent series resistance.

Due to its obsolete status, equivalent and substitute parts from active manufacturers are necessary for ongoing design support, production continuity, and long-term component availability. Substitute parts maintain the same capacitance value and mechanical form factor while offering improved specifications, extended lifetime ratings, or enhanced compliance certifications.

Key Parameters

Parameter	Value	Unit	Substitution Relevance
Capacitance	330	µF	Critical - must match exactly
Voltage Rating	6.3	V	Critical - substitutes must equal or exceed
Tolerance	±20%	%	Critical - must match or be tighter
Lead Spacing	3.50	mm	Critical - mechanical compatibility
Package Type	Radial, Can	-	Critical - form factor requirement
Mounting Type	Through Hole	-	Critical - PCB assembly compatibility
Size / Diameter	8.00	mm	Critical - physical fit
Height (Seated Max)	11.50	mm	Critical - clearance requirement
Operating Temperature Range	-40 to 105	°C	Important - thermal environment compatibility
Lifetime @ 105°C	2000	Hours	Important - reliability specification
ESR @ 120 Hz	1.04	Ohm	Important - electrical performance
Ripple Current @ 120 Hz	200	mA	Important - thermal stress rating
RoHS Status	ROHS3 Compliant	-	Important - regulatory compliance

Substitute Part Grouping Explanation

Substitute parts for the SH331M6R3ST are categorized into two groups based on voltage rating and application profile:

Upgrade Substitutes (Higher Voltage Rating): Parts with voltage ratings of 10 V or 16 V maintain the same 330 µF capacitance and identical mechanical dimensions (8.00 mm diameter, 11.50 mm height, 3.50 mm lead spacing). These substitutes are electrically compatible in circuits designed for 6.3 V operation, as higher-rated capacitors function safely at lower voltages. Upgrade substitutes include SEK331M010ST (10 V), EEU-FC1A331 (10 V), EEU-FC1C331 (16 V), UHE1C331MPD (16 V), and UPW1C331MPD (16 V).

Similar Substitute (Higher Voltage, Extended Height): EEU-FM1E331L operates at 25 V with identical capacitance and diameter but features an increased seated height of 16.50 mm (compared to 11.50 mm). This part is suitable only when vertical clearance permits the additional 5.00 mm height.

Substitution logic is based strictly on:

Capacitance value: 330 µF (exact match required)
Voltage rating: Equal to or greater than 6.3 V
Lead spacing: 3.50 mm (exact match required)
Package type: Radial, can (exact match required)
Mounting type: Through hole (exact match required)
Diameter: 8.00 mm (exact match required for standard substitutes)
Height: 11.50 mm (exact match for standard substitutes; 16.50 mm for similar substitute only if clearance available)
Polarization: Polar (exact match required)

Parameter Comparison

Parameter	SH331M6R3ST	SEK331M010ST	EEU-FC1A331	EEU-FC1C331	UHE1C331MPD	UPW1A331MPD	UPW1C331MPD	EEU-FM1E331L
Manufacturer	CDE	CDE	Panasonic	Panasonic	Nichicon	Nichicon	Nichicon	Panasonic
Capacitance (µF)	330	330	330	330	330	330	330	330
Voltage Rating (V)	6.3	10	10	16	16	10	16	25
Tolerance (%)	±20	±20	±20	±20	±20	±20	±20	±20
Lead Spacing (mm)	3.50	3.50	3.50	3.50	3.50	3.50	3.50	3.50
Diameter (mm)	8.00	8.00	8.00	8.00	8.00	8.00	8.00	8.00
Height Seated Max (mm)	11.50	11.50	11.50	11.50	11.50	11.50	11.50	16.50
Operating Temp Range (°C)	-40 to 105	-55 to 105	-55 to 105	-55 to 105	-40 to 105	-55 to 105	-55 to 105	-40 to 105
Lifetime @ 105°C (Hours)	2000	2000	2000	2000	7000	3000	3000	3000
ESR @ 120 Hz (Ohm)	1.04	0.880	-	-	-	-	-	-
Ripple Current @ 120 Hz (mA)	200	255	360.8	360.8	448	360.75	360.75	868
Mounting Type	Through Hole	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	Radial, Can
Product Status	Obsolete	Active	Active	Active	Not For New Designs	Not For New Designs	Not For New Designs	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation - Active Status: SEK331M010ST (CDE) and EEU-FC1C331 (Panasonic) are the preferred substitutes. Both are active products with confirmed long-term availability. SEK331M010ST maintains CDE manufacturer continuity with improved ESR (880 mOhm) and extended ripple current capability (255 mA @ 120 Hz). EEU-FC1C331 offers AEC-Q200 automotive qualification and significantly higher ripple current rating (360.8 mA @ 120 Hz), suitable for demanding thermal environments.

Secondary Recommendation - Extended Lifetime: UHE1C331MPD (Nichicon) provides 7000-hour lifetime at 105°C, triple the original specification. This part is classified as "Not For New Designs" but remains available for replacement and retrofit applications where extended reliability is required. Ripple current capability reaches 448 mA @ 120 Hz.

Alternative for Extended Height Clearance: EEU-FM1E331L (Panasonic) operates at 25 V with superior ripple current performance (868 mA @ 120 Hz) and lower impedance (41 mOhms). This part is suitable only when the additional 5.00 mm height (16.50 mm total) does not conflict with PCB layout constraints.

Compliance Consideration: All substitute parts maintain ROHS3 compliance. Panasonic EEU-FC series parts carry AEC-Q200 automotive qualification, appropriate for applications requiring automotive-grade reliability standards.

Inventory Availability: EEU-FM1E331L demonstrates highest stock levels (172,961 units), followed by SEK331M010ST (9,133 units) and UPW1C331MPD (8,253 units), ensuring supply chain continuity for high-volume production requirements.

Frequently Asked Questions (FAQ)

Q: Can SH331M6R3ST be directly replaced with a 10 V or 16 V rated substitute?

A: Yes. Capacitors with higher voltage ratings function safely at lower voltages. A 10 V or 16 V rated capacitor operates correctly in a circuit designed for 6.3 V operation. The higher voltage rating provides additional safety margin and does not degrade circuit performance.

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

A: ESR affects ripple current handling and thermal performance. Lower ESR values indicate better high-frequency performance and reduced heat generation. SEK331M010ST (880 mOhm @ 120 Hz) offers lower ESR than the original SH331M6R3ST (1.04 Ohm @ 120 Hz), resulting in improved thermal characteristics.

Q: Why does EEU-FM1E331L have a different height (16.50 mm vs. 11.50 mm)?

A: The 25 V voltage rating requires a taller can design to accommodate increased dielectric thickness. This part is suitable only when vertical PCB clearance permits the additional 5.00 mm height. Verify mechanical fit before selection.

Q: What does "Not For New Designs" status mean for UHE1C331MPD and UPW series parts?

A: This designation indicates the manufacturer is not recommending these parts for new product development. However, they remain available for replacement, retrofit, and legacy system support. These parts are suitable for field replacements and production of existing designs.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance, ensuring compatibility with environmental and regulatory requirements equivalent to the original SH331M6R3ST.

Q: What is the difference between Panasonic EEU-FC1A331 and EEU-FC1C331?

A: Both parts are identical except for voltage rating: EEU-FC1A331 is rated 10 V, while EEU-FC1C331 is rated 16 V. Both carry AEC-Q200 automotive qualification and identical mechanical dimensions. Selection depends on circuit voltage requirements.

Q: How does ripple current rating affect component selection?

A: Ripple current rating determines the maximum AC current the capacitor can safely handle without exceeding temperature limits. Higher ripple current ratings indicate better performance in high-frequency switching applications. Panasonic EEU-FC series (360.8 mA @ 120 Hz) and EEU-FM1E331L (868 mA @ 120 Hz) offer superior ripple current handling compared to the original part (200 mA @ 120 Hz).

Q: Can substitute parts with extended temperature range (-55°C to 105°C) be used in place of the original (-40°C to 105°C)?

A: Yes. Extended temperature range provides additional operational margin and is fully compatible with circuits designed for the narrower original range. This represents an improvement in environmental robustness.

Q: What is the lead spacing significance for through-hole mounting?

A: Lead spacing (3.50 mm) determines PCB hole pattern compatibility. All substitute parts maintain identical 3.50 mm lead spacing, ensuring direct PCB footprint compatibility without layout modification.

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