UEP1E331MHD Equivalent & Substitute Parts

Part Overview

The UEP1E331MHD is a 330 µF, 25 V aluminum electrolytic capacitor in radial, can package manufactured by Nichicon. This component is rated for 1000 hours at 105°C and is designed for general-purpose applications. The part is classified as "Not For New Designs," making identification of equivalent and substitute components essential for ongoing maintenance, repair, and legacy system support.

Key Parameters

Parameter	Value
Capacitance	330 µF
Voltage - Rated	25 V
Tolerance	±20%
Lifetime @ Temperature	1000 Hrs @ 105°C
Operating Temperature Range	-55°C ~ 105°C
Polarization	Bi-Polar
Lead Spacing	0.197" (5.00 mm)
Package / Case	Radial, Can
Mounting Type	Through Hole
Size / Dimension	0.492" Dia (12.50 mm)
Height - Seated (Max)	0.866" (22.00 mm)

Substitute Part Grouping Explanation

Substitution of the UEP1E331MHD is determined by strict equivalence in the following critical parameters: capacitance value (330 µF), rated voltage (25 V or higher), tolerance (±20%), physical dimensions (0.492" diameter, 0.866" height, 5.00 mm lead spacing), and through-hole radial can package configuration. All substitute parts must maintain identical or superior electrical ratings and mechanical compatibility to ensure direct replacement without circuit redesign.

The substitute parts are grouped as follows:

Parametric Equivalent: UEP1E331MHD1CV (Nichicon) — Identical electrical specifications and physical dimensions; differs only in product status (Active vs. Not For New Designs).

Upgrade Substitute: 35NXA330MEFC12.5X20 (Rubycon) — Maintains identical capacitance, tolerance, physical dimensions, and lead spacing; provides higher rated voltage (35 V vs. 25 V), enabling use in circuits with higher voltage margins.

Parameter Comparison

Parameter	UEP1E331MHD	UEP1E331MHD1CV	35NXA330MEFC12.5X20
Manufacturer	Nichicon	Nichicon	Rubycon
Capacitance	330 µF	330 µF	330 µF
Voltage - Rated	25 V	25 V	35 V
Tolerance	±20%	±20%	±20%
Lifetime @ Temperature	1000 Hrs @ 105°C	1000 Hrs @ 105°C	1000 Hrs @ 105°C
Operating Temperature Range	-55°C ~ 105°C	-55°C ~ 105°C	-55°C ~ 105°C
Polarization	Bi-Polar	Bi-Polar	Bi-Polar
Lead Spacing	0.197" (5.00 mm)	0.197" (5.00 mm)	0.197" (5.00 mm)
Size / Dimension	0.492" Dia (12.50 mm)	0.492" Dia (12.50 mm)	0.492" Dia (12.50 mm)
Height - Seated (Max)	0.866" (22.00 mm)	0.866" (22.00 mm)	0.866" (22.00 mm)
Package / Case	Radial, Can	Radial, Can	Radial, Can
Mounting Type	Through Hole	Through Hole	Through Hole
Product Status	Not For New Designs	Active	Active
RoHS Status	ROHS3 Compliant	Not specified	ROHS3 Compliant

Engineering Selection Recommendations

UEP1E331MHD1CV is the direct parametric equivalent and preferred substitute for the UEP1E331MHD. Both components are manufactured by Nichicon with identical electrical and mechanical specifications. The primary advantage of UEP1E331MHD1CV is its Active product status, ensuring continued availability and manufacturing support. This part is suitable for direct replacement in all applications where the original UEP1E331MHD was specified.

35NXA330MEFC12.5X20 (Rubycon) serves as an upgrade substitute. The 35 V rated voltage provides additional voltage margin compared to the 25 V rating of the original part, making it suitable for circuits operating at or below 25 V. The identical physical dimensions and lead spacing ensure mechanical compatibility. This part is classified as Active and ROHS3 Compliant. Selection of this upgrade substitute is appropriate when enhanced voltage headroom is beneficial or when Rubycon components are preferred within the supply chain.

Frequently Asked Questions (FAQ)

Q: Can UEP1E331MHD1CV be used as a direct replacement for UEP1E331MHD?

A: Yes. Both parts are manufactured by Nichicon with identical capacitance (330 µF), rated voltage (25 V), tolerance (±20%), physical dimensions, and lead spacing. The parts are mechanically and electrically interchangeable.

Q: What is the advantage of using 35NXA330MEFC12.5X20 over the original UEP1E331MHD?

A: The 35NXA330MEFC12.5X20 maintains all electrical and mechanical specifications of the original part while providing a higher rated voltage (35 V vs. 25 V). This additional voltage margin can improve circuit reliability in applications with voltage transients or marginal operating conditions. Both parts share identical physical dimensions and lead spacing.

Q: Are all three parts mechanically compatible with the same PCB footprint?

A: Yes. All three parts have identical lead spacing (0.197" / 5.00 mm), diameter (0.492" / 12.50 mm), and height (0.866" / 22.00 mm). They are fully compatible with the same through-hole radial can footprint.

Q: Why is the original UEP1E331MHD marked "Not For New Designs"?

A: This designation indicates that Nichicon has discontinued active promotion of this part for new circuit designs. However, the part remains available for legacy system support and repair. The UEP1E331MHD1CV provides an Active alternative from the same manufacturer.

Q: What is the difference between Nichicon and Rubycon substitutes?

A: Both manufacturers produce aluminum electrolytic capacitors meeting the same electrical and mechanical specifications. The choice between manufacturers depends on supply chain preferences, inventory availability, and design requirements. The Rubycon 35NXA330MEFC12.5X20 offers the additional benefit of higher rated voltage.

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