ECA-2AM331 330µF 100V Radial Aluminum Electrolytic Capacitor Equivalent & Substitute Parts

Part Overview

The ECA-2AM331 is a 330µF, 100V radial aluminum electrolytic capacitor manufactured by Panasonic Electronic Components in the M-A series. This component is rated for 2000 hours at 85°C and is designed for general-purpose applications requiring polar capacitive energy storage and filtering. The part is Active status and ROHS3 compliant.

Equivalent and substitute parts are necessary when the primary part becomes unavailable, when packaging requirements differ, or when design specifications allow for alternative manufacturers meeting identical or superior electrical and mechanical parameters.

Key Parameters

Parameter	Value
Capacitance	330 µF
Voltage Rating	100 V
Tolerance	±20%
Lifetime @ Temperature	2000 Hrs @ 85°C
Operating Temperature Range	-40°C ~ 85°C
Polarization	Polar
Lead Spacing	0.197" (5.00mm)
Case Diameter	0.492" (12.50mm)
Height (Seated Max)	1.063" (27.00mm)
Mounting Type	Through Hole
Package Type	Radial, Can
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict equivalence in the following parameters:

Capacitance: 330 µF (exact match required)
Voltage Rating: 100 V (exact match required)
Tolerance: ±20% (exact match required)
Polarization: Polar (exact match required)
Mounting Type: Through Hole (exact match required)
Package Type: Radial, Can (exact match required)

Parts are grouped into the following categories:

Direct Substitutes (Identical Electrical & Mechanical Specifications): Parts with matching lead spacing (5.00mm), case diameter (12.50mm), and height (27.00mm or equivalent within tolerance).

Packaging Variants: Parts with identical electrical specifications but different packaging formats (Bulk vs. Cut Tape).

Upgraded Specifications: Parts meeting all core electrical requirements with enhanced lifetime ratings (2000 Hrs @ 105°C vs. 2000 Hrs @ 85°C) or extended operating temperature ranges.

Similar Specifications with Dimensional Variations: Parts meeting all electrical requirements but with different lead spacing or case dimensions, requiring PCB layout verification.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Capacitance	Voltage	Tolerance	Lifetime @ Temp	Operating Temp Range	Lead Spacing	Case Diameter	Height (Max)	Product Status	Packaging
ECA-2AM331	Panasonic	330 µF	100 V	±20%	2000 Hrs @ 85°C	-40°C ~ 85°C	5.00mm	12.50mm	27.00mm	Active	Bulk
ECA-2AM331B	Panasonic	330 µF	100 V	±20%	2000 Hrs @ 85°C	-40°C ~ 85°C	5.00mm	12.50mm	27.00mm	Active	Cut Tape (CT)
ESMG101ELL331MK25S	Chemi-Con	330 µF	100 V	±20%	2000 Hrs @ 85°C	-40°C ~ 85°C	5.00mm	12.50mm	26.50mm	Active	Bulk
100PX330MEFC12.5X25	Rubycon	330 µF	100 V	±20%	2000 Hrs @ 105°C	-55°C ~ 105°C	5.00mm	12.50mm	26.50mm	Active	Bulk
337CKE100M	Cornell Dubilier / Illinois Capacitor	330 µF	100 V	±20%	2000 Hrs @ 105°C	-40°C ~ 105°C	5.00mm	12.50mm	26.50mm	Active	Bulk
100PK330MEFC12.5X25	Rubycon	330 µF	100 V	±20%	2000 Hrs @ 85°C	-40°C ~ 85°C	5.00mm	12.50mm	27.00mm	Active	Bulk
UVK2A331MHD	Nichicon	330 µF	100 V	±20%	2000 Hrs @ 85°C	-40°C ~ 85°C	5.00mm	12.50mm	27.00mm	Not For New Designs	Bulk
URS2A331MHD	Nichicon	330 µF	100 V	±20%	2000 Hrs @ 85°C	-40°C ~ 85°C	7.50mm	18.00mm	16.50mm	Active	Bulk
UKL2A331MHD	Nichicon	330 µF	100 V	±20%	2000 Hrs @ 85°C	-40°C ~ 85°C	7.50mm	16.00mm	33.00mm	Not For New Designs	Bulk

Engineering Selection Recommendations

For Direct PCB Replacement (No Layout Changes): Select ECA-2AM331B, ESMG101ELL331MK25S, 100PK330MEFC12.5X25, or UVK2A331MHD. These parts maintain the 5.00mm lead spacing and 12.50mm case diameter of the original ECA-2AM331. ECA-2AM331B is the packaging variant of the primary part. ESMG101ELL331MK25S (Chemi-Con) and 100PK330MEFC12.5X25 (Rubycon) are Active status alternatives with identical footprints. UVK2A331MHD (Nichicon) is electrically equivalent but marked "Not For New Designs."

For Enhanced Thermal Performance: Select 100PX330MEFC12.5X25 or 337CKE100M. Both are rated for 2000 hours at 105°C with extended operating temperature ranges (-55°C to 105°C for Rubycon; -40°C to 105°C for Cornell Dubilier). These parts maintain the 5.00mm lead spacing and 12.50mm case diameter. Both are Active status. The 337CKE100M provides specified ESR (402mOhm @ 120Hz) and higher ripple current capability at 100 kHz (1.32 A).

For Alternative Footprints (PCB Layout Modification Required): URS2A331MHD and UKL2A331MHD (Nichicon) meet all electrical specifications but feature different mechanical dimensions. URS2A331MHD has 7.50mm lead spacing and 18.00mm case diameter. UKL2A331MHD has 7.50mm lead spacing and 16.00mm case diameter with greater height (33.00mm). Both are marked "Not For New Designs." These options require PCB layout verification and are suitable only when space constraints or design requirements necessitate alternative dimensions.

Compliance & Availability: All listed parts are ROHS3 compliant and REACH unaffected. Inventory availability varies: 337CKE100M has the highest stock (22,432 pcs), followed by 100PX330MEFC12.5X25 (4,200 pcs). Parts marked "Not For New Designs" should be used only for legacy system maintenance or when no other alternatives are available.

Frequently Asked Questions (FAQ)

Q: Can I use URS2A331MHD or UKL2A331MHD as direct replacements for ECA-2AM331?

A: No. While these Nichicon parts are electrically equivalent (330µF, 100V, ±20%, 2000 Hrs @ 85°C), they have different lead spacing and case dimensions. URS2A331MHD has 7.50mm lead spacing versus the original 5.00mm. UKL2A331MHD also has 7.50mm lead spacing with a larger case diameter (16.00mm vs. 12.50mm) and greater height (33.00mm vs. 27.00mm). PCB layout modification is required for these parts.

Q: What is the difference between ECA-2AM331 and ECA-2AM331B?

A: Both parts are identical in electrical and mechanical specifications. The only difference is packaging: ECA-2AM331 is supplied in Bulk packaging, while ECA-2AM331B is supplied in Cut Tape (CT) format. Selection depends on assembly process requirements.

Q: Should I use parts marked "Not For New Designs"?

A: Parts marked "Not For New Designs" (UVK2A331MHD and UKL2A331MHD) are suitable only for replacement in existing systems or legacy applications. For new designs, select from Active status alternatives: ECA-2AM331B, ESMG101ELL331MK25S, 100PX330MEFC12.5X25, 337CKE100M, or 100PK330MEFC12.5X25.

Q: What are the advantages of 100PX330MEFC12.5X25 and 337CKE100M over the original ECA-2AM331?

A: Both parts offer enhanced thermal performance with 2000-hour lifetime ratings at 105°C instead of 85°C. 100PX330MEFC12.5X25 extends the operating temperature range to -55°C ~ 105°C. 337CKE100M provides specified ESR (402mOhm @ 120Hz) and higher ripple current at 100 kHz (1.32 A vs. 1.19 A). Both maintain the original 5.00mm lead spacing and 12.50mm case diameter for direct PCB replacement.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts are ROHS3 compliant and REACH unaffected, matching the compliance status of the original ECA-2AM331.

Q: Which substitute part has the best availability?

A: 337CKE100M (Cornell Dubilier / Illinois Capacitor) has the highest inventory at 22,432 pieces. 100PX330MEFC12.5X25 (Rubycon) has 4,200 pieces available. For Panasonic alternatives, ECA-2AM331B has 1,080 pieces in Cut Tape format.

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