UHE2A331MHD Equivalent & Substitute Parts

Part Overview

The UHE2A331MHD is a 330 µF, 100 V aluminum electrolytic capacitor in radial, can package manufactured by Nichicon. This component is classified as Not For New Designs, indicating it has been superseded in Nichicon's product line. Finding equivalent and substitute parts is necessary for maintenance, repair, and legacy system support where original stock may be unavailable or depleted.

Key Parameters

Parameter	Value
Capacitance	330 µF
Voltage Rating	100 V
Tolerance	±20%
Package Type	Radial, Can
Mounting Type	Through Hole
Operating Temperature Range	-40°C ~ 105°C
Polarization	Polar
Application	General Purpose

Substitute Part Grouping Explanation

Substitution eligibility for the UHE2A331MHD is determined by the following mandatory parameters:

Capacitance: 330 µF (exact match required)
Voltage Rating: 100 V (exact match required)
Tolerance: ±20% (exact match required)
Package Type: Radial, Can (exact match required)
Mounting Type: Through Hole (exact match required)
Polarization: Polar (exact match required)
Operating Temperature Range: -40°C ~ 105°C (exact match required)

All substitute parts listed meet these core electrical and mechanical parameters. Variations in physical dimensions (lead spacing, diameter, height), ripple current ratings, impedance, and lifetime specifications are secondary considerations that may affect board layout compatibility but do not disqualify substitution when the primary parameters align.

Parameter Comparison

Parameter	UHE2A331MHD	UHE2A331MHD6	EKZE101ELL331MK35S	EKZE101ELL331MM20S
Manufacturer	Nichicon	Nichicon	Chemi-Con	Chemi-Con
Capacitance	330 µF	330 µF	330 µF	330 µF
Voltage Rating	100 V	100 V	100 V	100 V
Tolerance	±20%	±20%	±20%	±20%
Operating Temperature	-40°C ~ 105°C	-40°C ~ 105°C	-40°C ~ 105°C	-40°C ~ 105°C
Lifetime @ 105°C	10000 Hrs	10000 Hrs	5000 Hrs	5000 Hrs
Lead Spacing	0.197" (5.00mm)	0.295" (7.50mm)	0.197" (5.00mm)	0.295" (7.50mm)
Diameter	0.492" (12.50mm)	0.709" (18.00mm)	0.492" (12.50mm)	0.709" (18.00mm)
Height (Max)	1.575" (40.00mm)	0.787" (20.00mm)	1.437" (36.50mm)	0.846" (21.50mm)
Impedance	71 mOhms	80 mOhms	36 mOhms	45 mOhms
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Not For New Designs	Not For New Designs	Active	Active

Engineering Selection Recommendations

Nichicon UHE2A331MHD6: Direct manufacturer equivalent with identical electrical specifications and 10000 hour lifetime rating. Differs in physical dimensions (larger diameter and lead spacing, reduced height). Suitable for applications where board layout accommodates the larger footprint. Maintains Not For New Designs status.

Chemi-Con EKZE101ELL331MK35S and EKZE101ELL331MM20S: Both are active product alternatives from a qualified manufacturer. These parts feature reduced lifetime ratings (5000 hours at 105°C versus 10000 hours) and lower impedance values. Available in two footprint variants matching the original lead spacing options. ROHS3 compliant and REACH unaffected. Recommended for new designs and applications where reduced lifetime is acceptable.

Selection between substitute parts should prioritize board layout compatibility (lead spacing and physical dimensions) and application lifetime requirements. All listed parts meet the core electrical parameters required for functional substitution.

Frequently Asked Questions (FAQ)

Q: Can EKZE101ELL331MM20S replace UHE2A331MHD directly on the PCB?

A: Electrical substitution is valid. However, physical compatibility depends on lead spacing and height. EKZE101ELL331MM20S has 0.295" (7.50mm) lead spacing versus the original 0.197" (5.00mm), requiring PCB layout verification. Height difference (0.846" versus 1.575") may affect clearance in confined spaces.

Q: What is the impact of the reduced 5000-hour lifetime in Chemi-Con parts?

A: The Chemi-Con EKZE series provides 5000 hours at 105°C compared to 10000 hours for Nichicon UHE series. This affects long-term reliability in high-temperature applications. Applications with continuous operation at elevated temperatures should account for this reduced service life in maintenance planning.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed parts—UHE2A331MHD, UHE2A331MHD6, EKZE101ELL331MK35S, and EKZE101ELL331MM20S—are ROHS3 compliant and suitable for regulated markets.

Q: Which substitute offers the best electrical performance?

A: EKZE101ELL331MK35S provides the lowest impedance (36 mOhms) and highest ripple current handling at high frequency (1.65 A @ 100 kHz). This makes it suitable for applications requiring superior high-frequency performance, though it maintains the same core electrical ratings as the original part.

Q: Can I use UHE2A331MHD6 as a drop-in replacement?

A: UHE2A331MHD6 is electrically identical and from the same manufacturer. Physical dimensions differ significantly (larger can diameter and different lead spacing). Verify PCB hole spacing and component clearance before substitution.

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