UKL2A331MHD Equivalent & Substitute Parts

Part Overview

The UKL2A331MHD is a 330 µF, 100 V aluminum electrolytic capacitor in radial can package manufactured by Nichicon. This component is rated for 2000 hours at 85°C and is designated as "Not For New Designs," indicating it has been superseded in Nichicon's product portfolio. Finding equivalent or substitute parts is necessary for ongoing maintenance, repair, and legacy system support where this specific part number may no longer be readily available or where design improvements are desired.

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
Lead Spacing	0.295" (7.50 mm)
Case Diameter	0.630" (16.00 mm)
Height (Seated Max)	1.299" (33.00 mm)
Mounting Type	Through Hole
Package	Radial, Can
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of aluminum electrolytic capacitors is determined by strict electrical and mechanical compatibility. The following criteria must be met for a part to serve as a direct or upgrade substitute:

Mandatory Matching Parameters:

Capacitance value: 330 µF
Voltage rating: equal to or greater than 100 V
Polarization: Polar (same as main part)
Mounting type: Through Hole
Lead spacing: 0.295" (7.50 mm)
Case diameter: 0.630" (16.00 mm)
Package type: Radial, Can

Substitution Categories:

Upgrade Substitutes — Parts with improved electrical performance (higher ripple current capability, lower ESR, extended lifetime) while maintaining identical mechanical footprint and lead spacing. These parts are suitable for direct replacement with enhanced reliability.

Similar Substitutes — Parts with identical electrical ratings but different physical dimensions (case diameter or height). These require PCB layout verification before substitution.

Parametric Equivalents — Parts with modified tolerance specifications (±10% vs. ±20%) but otherwise identical parameters. Suitable where tighter tolerance is beneficial.

Direct Substitutes — Parts from alternative manufacturers meeting all electrical and mechanical specifications with identical or superior performance characteristics.

Parameter Comparison

Part Number	Manufacturer	Series	Capacitance	Voltage	Tolerance	Lifetime @ Temp	Operating Temp Range	Lead Spacing	Case Dia	Height (Max)	Product Status
UKL2A331MHD	Nichicon	UKL	330 µF	100 V	±20%	2000 Hrs @ 85°C	-40°C ~ 85°C	0.295" (7.50 mm)	0.630" (16.00 mm)	1.299" (33.00 mm)	Not For New Designs
UBT2A331MHD8	Nichicon	UBT	330 µF	100 V	±20%	5000 Hrs @ 125°C	-40°C ~ 125°C	0.295" (7.50 mm)	0.630" (16.00 mm)	1.319" (34.60 mm)	Active
UBW2A331MHD	Nichicon	UBW	330 µF	100 V	±20%	3000 Hrs @ 135°C	-55°C ~ 135°C	0.295" (7.50 mm)	0.630" (16.00 mm)	1.319" (34.60 mm)	Active
UCY2C331MHD	Nichicon	UCY	330 µF	160 V	±20%	12000 Hrs @ 105°C	-40°C ~ 105°C	0.295" (7.50 mm)	0.630" (16.00 mm)	1.299" (33.00 mm)	Active
UPJ2A331MHD	Nichicon	UPJ	330 µF	100 V	±20%	5000 Hrs @ 105°C	-55°C ~ 105°C	0.295" (7.50 mm)	0.630" (16.00 mm)	1.299" (33.00 mm)	Not For New Designs
URS2A331MHD	Nichicon	URS	330 µF	100 V	±20%	2000 Hrs @ 85°C	-40°C ~ 85°C	0.295" (7.50 mm)	0.709" (18.00 mm)	0.650" (16.50 mm)	Active
UVK2A331MHD	Nichicon	UVK	330 µF	100 V	±20%	2000 Hrs @ 85°C	-40°C ~ 85°C	0.197" (5.00 mm)	0.492" (12.50 mm)	1.063" (27.00 mm)	Not For New Designs
UKL2A331KHD	Nichicon	UKL	330 µF	100 V	±10%	2000 Hrs @ 85°C	-40°C ~ 85°C	0.295" (7.50 mm)	0.630" (16.00 mm)	1.299" (33.00 mm)	Not For New Designs
MAL213639331E3	Vishay Beyschlag/Draloric/BC Components	136 RVI	330 µF	100 V	±20%	10000 Hrs @ 105°C	-55°C ~ 105°C	0.295" (7.50 mm)	0.630" (16.00 mm)	1.319" (34.60 mm)	Active
MAL213659331E3	Vishay Beyschlag/Draloric/BC Components	136 RVI	330 µF	100 V	±20%	10000 Hrs @ 105°C	-55°C ~ 105°C	0.295" (7.50 mm)	0.630" (16.00 mm)	1.319" (34.60 mm)	Active
MAL213669331E3	Vishay Beyschlag/Draloric/BC Components	136 RVI	330 µF	100 V	±20%	10000 Hrs @ 105°C	-55°C ~ 105°C	0.295" (7.50 mm)	0.630" (16.00 mm)	1.319" (34.60 mm)	Active

Engineering Selection Recommendations

For Direct Replacement with Improved Reliability:

UBT2A331MHD8 and UBW2A331MHD are recommended as primary upgrade substitutes. Both maintain identical lead spacing (0.295", 7.50 mm) and case diameter (0.630", 16.00 mm) as the UKL2A331MHD. The UBT2A331MHD8 offers 5000-hour lifetime at 125°C with extended operating temperature range (-40°C to 125°C), while UBW2A331MHD extends to 3000 hours at 135°C with operating range -55°C to 135°C. Both are Active status products suitable for new designs. Height difference is minimal (1.319" vs. 1.299"), typically accommodated in standard PCB layouts.

For Extended Voltage Margin:

UCY2C331MHD provides 160 V rating with 12000-hour lifetime at 105°C, maintaining identical mechanical footprint. This part is suitable where higher voltage headroom is required or where extended operational life is critical. Operating temperature range is -40°C to 105°C.

For Alternative Manufacturer Source:

MAL213639331E3, MAL213659331E3, and MAL213669331E3 (Vishay Beyschlag/Draloric/BC Components, 136 RVI series) are direct substitutes with 10000-hour lifetime at 105°C and extended operating range (-55°C to 105°C). All three maintain identical electrical specifications and mechanical compatibility. These parts are Active status and provide supply chain diversification.

For Tighter Tolerance Requirement:

UKL2A331KHD offers ±10% tolerance versus the ±20% of the main part, with all other parameters identical. This part is suitable where capacitance accuracy is critical to circuit performance.

Parts Requiring PCB Layout Verification:

URS2A331MHD has different physical dimensions (0.709" diameter, 0.650" height) and requires PCB layout verification before substitution. UVK2A331MHD has significantly different dimensions (0.492" diameter, 1.063" height, 0.197" lead spacing) and is not recommended as a direct substitute without major PCB redesign.

Frequently Asked Questions (FAQ)

Q: Can UBT2A331MHD8 be used as a direct replacement for UKL2A331MHD?

A: Yes. Both parts have identical capacitance (330 µF), voltage rating (100 V), tolerance (±20%), lead spacing (0.295", 7.50 mm), and case diameter (0.630", 16.00 mm). The UBT2A331MHD8 has a height of 1.319" compared to 1.299" for the UKL2A331MHD—a 0.020" difference that is typically accommodated in standard PCB layouts. The UBT2A331MHD8 is an Active product with superior lifetime (5000 hours at 125°C vs. 2000 hours at 85°C).

Q: What is the difference between upgrade substitutes and similar substitutes?

A: Upgrade substitutes maintain identical mechanical footprint (lead spacing, case diameter, height) and can be used as direct PCB replacements with no layout changes. Similar substitutes have different physical dimensions and require PCB layout verification. URS2A331MHD and UVK2A331MHD are classified as similar substitutes due to dimensional differences.

Q: Why is UCY2C331MHD listed as a substitute if it has 160 V rating instead of 100 V?

A: Higher voltage rating is a superset of lower voltage capability. A 160 V capacitor can safely operate in a 100 V circuit. UCY2C331MHD is electrically compatible and offers additional voltage margin, making it suitable for applications where higher voltage headroom is beneficial or where the circuit may experience transient overvoltage conditions.

Q: Are the Vishay MAL213 series parts fully compatible?

A: Yes. MAL213639331E3, MAL213659331E3, and MAL213669331E3 are direct substitutes from an alternative manufacturer. All three have identical electrical specifications (330 µF, 100 V, ±20% tolerance) and mechanical compatibility (0.295" lead spacing, 0.630" case diameter). The three part numbers differ in packaging configuration (Tape & Box vs. Bulk), not in component specifications.

Q: Can UKL2A331KHD replace UKL2A331MHD?

A: Yes. UKL2A331KHD is a parametric equivalent with tighter tolerance (±10% vs. ±20%). All other specifications are identical, including mechanical dimensions. This substitution is suitable where improved capacitance accuracy is required.

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

A: This designation indicates the part has been superseded in the manufacturer's product line. While the part remains available, it is no longer recommended for new circuit designs. For legacy system repair and maintenance, it remains functional. For new designs, Active status alternatives such as UBT2A331MHD8, UBW2A331MHD, or Vishay MAL213 series are recommended.

Q: Is RoHS3 compliance maintained across all substitute parts?

A: Yes. All listed substitute parts are ROHS3 compliant, matching the compliance status of the UKL2A331MHD.

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