Nichicon UKZ1E331MHM Equivalent & Substitute Parts

Part Overview

The Nichicon UKZ1E331MHM is a 330 µF, 25 V aluminum electrolytic capacitor in radial, can package with through-hole mounting. Rated for 1000 hours at 85°C, this component is classified as obsolete. Due to its discontinued status, equivalent substitute parts with compatible electrical and mechanical specifications are necessary for circuit maintenance, repair, and legacy system support.

Key Parameters

Parameter	Value
Capacitance	330 µF
Voltage Rating	25 V
Tolerance	±20%
Package Type	Radial, Can
Lead Spacing	0.197" (5.00 mm)
Case Diameter	0.492" (12.50 mm)
Height	0.984" (25.00 mm)
Mounting Type	Through Hole
Operating Temperature Range	-40°C to 85°C
Polarization	Polar
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution for the UKZ1E331MHM is determined by the following criteria:

Mandatory Matching Parameters:

Capacitance: 330 µF (exact match required)
Tolerance: ±20% (exact match required)
Package Type: Radial, Can (exact match required)
Lead Spacing: 0.197" (5.00 mm) (exact match required)
Case Diameter: 0.492" (12.50 mm) (exact match required)
Height: 0.984" (25.00 mm) (exact match required)
Mounting Type: Through Hole (exact match required)
Operating Temperature Range: -40°C to 85°C (exact match required)
Polarization: Polar (exact match required)

Allowable Variation Parameters:

Voltage Rating: May be equal to or greater than 25 V (higher voltage ratings are acceptable for drop-in replacement)
Lifetime @ Temperature: May be equal to or greater than 1000 Hrs @ 85°C (longer lifetime is acceptable)
Ripple Current Ratings: May vary within acceptable operating margins

All substitute parts listed below meet these criteria and are ROHS3 compliant.

Parameter Comparison

Parameter	UKZ1E331MHM	UFW2A331MHD	UKW2A331MHD	UVR2A331MHD
Manufacturer	Nichicon	Nichicon	Nichicon	Nichicon
Series	UKZ	UFW	UKW	UVR
Capacitance	330 µF	330 µF	330 µF	330 µF
Voltage Rating	25 V	100 V	100 V	100 V
Tolerance	±20%	±20%	±20%	±20%
Lead Spacing	0.197" (5.00 mm)	0.197" (5.00 mm)	0.197" (5.00 mm)	0.197" (5.00 mm)
Case Diameter	0.492" (12.50 mm)	0.492" (12.50 mm)	0.492" (12.50 mm)	0.492" (12.50 mm)
Height	0.984" (25.00 mm)	0.984" (25.00 mm)	0.984" (25.00 mm)	0.984" (25.00 mm)
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
Operating Temperature	-40°C to 85°C	-40°C to 85°C	-40°C to 85°C	-40°C to 85°C
Lifetime @ 85°C	1000 Hrs	2000 Hrs	2000 Hrs	2000 Hrs
Ripple Current @ 120 Hz	—	750 mA	750 mA	760 mA
Ripple Current @ 10 kHz	—	1.125 A	1.125 A	1.14 A
Product Status	Obsolete	Not For New Designs	Not For New Designs	Not For New Designs
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

All three substitute parts—UFW2A331MHD, UKW2A331MHD, and UVR2A331MHD—are direct mechanical and electrical replacements for the UKZ1E331MHM in through-hole applications. The substitutes feature identical physical dimensions, lead spacing, and mounting characteristics, ensuring PCB compatibility without layout modifications.

The primary difference among substitutes is voltage rating: all three are rated at 100 V, compared to the original 25 V specification. This higher voltage rating provides additional safety margin and is acceptable for drop-in replacement in circuits designed for 25 V operation.

All substitute parts demonstrate extended lifetime ratings of 2000 hours at 85°C, compared to the original 1000-hour specification, indicating improved thermal stability and reliability.

All parts maintain ROHS3 compliance and identical operating temperature ranges (-40°C to 85°C), ensuring regulatory and thermal compatibility with legacy systems.

Frequently Asked Questions (FAQ)

Q: Can UFW2A331MHD, UKW2A331MHD, or UVR2A331MHD be used as direct replacements for UKZ1E331MHM?

A: Yes. All three substitute parts match the mandatory electrical and mechanical parameters: 330 µF capacitance, ±20% tolerance, identical physical dimensions (0.492" diameter, 0.984" height, 5.00 mm lead spacing), through-hole mounting, and -40°C to 85°C operating range. The higher 100 V voltage rating is acceptable for circuits designed for 25 V operation.

Q: What is the significance of the higher voltage rating on substitute parts?

A: The 100 V rating on substitute parts provides additional voltage headroom compared to the original 25 V specification. In circuits operating at or below 25 V, this higher rating does not affect performance and is a standard practice in component substitution. The capacitor will function identically within the original circuit voltage parameters.

Q: Are there physical compatibility concerns when substituting these parts?

A: No. All substitute parts share identical physical specifications: case diameter, height, lead spacing, and through-hole mounting configuration. No PCB layout modifications are required for installation.

Q: Do the substitute parts meet the same compliance standards?

A: Yes. All substitute parts are ROHS3 compliant and REACH unaffected, matching the compliance profile of the original UKZ1E331MHM.

Q: Why do substitute parts have longer lifetime ratings?

A: The substitute parts are rated for 2000 hours at 85°C compared to the original 1000-hour specification. This reflects improved capacitor design and materials in the UFW, UKW, and UVR series, providing enhanced thermal stability and extended operational life in the same temperature environment.

Q: Can I use these substitutes in new designs?

A: All parts listed—including the original UKZ1E331MHM and all substitutes—carry "Obsolete" or "Not For New Designs" status. For new designs, consult current Nichicon aluminum electrolytic capacitor offerings with equivalent specifications.

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