UHM1C331MPD Equivalent & Substitute Parts

Part Overview

The UHM1C331MPD is a 330 µF, 16 V aluminum electrolytic capacitor in radial, can package manufactured by Nichicon. This component is classified as Obsolete, indicating it is no longer in active production. Finding equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production or repair requirements. Substitute parts must maintain electrical compatibility while meeting the same mechanical and thermal specifications.

Key Parameters

Parameter	Value
Capacitance	330 µF
Voltage Rating	16 V
Tolerance	±20%
Lifetime @ 105°C	2000 Hrs
Operating Temperature Range	-40°C ~ 105°C
Polarization	Polar
Lead Spacing	0.138" (4.60 mm)
Case Diameter	0.315" (8.00 mm)
Height (Max)	0.512" (13.00 mm)
Mounting Type	Through Hole
Package Type	Radial, Can

Substitute Part Grouping Explanation

Substitution of the UHM1C331MPD is determined by strict adherence to the following electrical and mechanical parameters:

Mandatory Matching Parameters:

Capacitance: 330 µF (exact match required)
Voltage Rating: 16 V minimum (equal or higher voltage rating is acceptable)
Tolerance: ±20% (standard tolerance for this category)
Polarization: Polar (electrolytic capacitor type)
Lead Spacing: 0.138" (4.60 mm)
Case Diameter: 0.315" (8.00 mm)
Mounting Type: Through Hole
Package Type: Radial, Can

Acceptable Variations:

Lifetime @ 105°C: May exceed 2000 Hrs (higher reliability is acceptable)
Operating Temperature Range: May exceed -40°C ~ 105°C (wider range is acceptable)
Height: May vary within mechanical envelope constraints
Impedance: May vary based on series design

Substitute parts are grouped into three categories: Upgrade (higher voltage or extended lifetime), Similar (same voltage with improved specifications), and Direct (equivalent from alternative manufacturer).

Parameter Comparison

Part Number	Manufacturer	Series	Capacitance	Voltage	Lifetime @ 105°C	Temp Range	Height (Max)	Status
UHM1C331MPD	Nichicon	UHM	330 µF	16 V	2000 Hrs	-40°C ~ 105°C	0.512"	Obsolete
UHV1E331MPD	Nichicon	UHV	330 µF	25 V	6000 Hrs	-40°C ~ 105°C	0.512"	Not For New Designs
UKA1C331MPD	Nichicon	UKA	330 µF	16 V	2000 Hrs	-55°C ~ 105°C	0.512"	Not For New Designs
UKA1E331MPD	Nichicon	UKA	330 µF	25 V	2000 Hrs	-55°C ~ 105°C	0.512"	Not For New Designs
UPA1C331MPD	Nichicon	UPA	330 µF	16 V	3000 Hrs	-55°C ~ 105°C	0.512"	Active
UPA1E331MPD	Nichicon	UPA	330 µF	25 V	3000 Hrs	-55°C ~ 105°C	0.512"	Active
UPS1C331MPD	Nichicon	UPS	330 µF	16 V	2000 Hrs	-55°C ~ 105°C	0.512"	Not For New Designs
UHD1C331MPD	Nichicon	UHD	330 µF	16 V	3000 Hrs	-40°C ~ 105°C	0.512"	Not For New Designs
UHE1C331MPD	Nichicon	UHE	330 µF	16 V	7000 Hrs	-40°C ~ 105°C	0.453"	Not For New Designs
UHV1C331MPD	Nichicon	UHV	330 µF	16 V	6000 Hrs	-40°C ~ 105°C	0.512"	Not For New Designs
ESH337M016AG3AA	KEMET	ESH	330 µF	16 V	2000 Hrs	-40°C ~ 105°C	0.492"	Active

Engineering Selection Recommendations

For Active Production (Recommended Primary Choices):

UPA1C331MPD is the preferred substitute for 16 V applications. This part maintains identical electrical specifications (330 µF, 16 V, ±20% tolerance) while offering extended lifetime (3000 Hrs @ 105°C versus 2000 Hrs), wider operating temperature range (-55°C ~ 105°C), and Active product status. RoHS3 compliance and REACH Affected status align with modern manufacturing standards.

UPA1E331MPD serves as the preferred substitute for applications requiring higher voltage margin. This 25 V rated part provides identical capacitance and tolerance with 3000 Hrs lifetime and Active status. The higher voltage rating offers additional design margin without mechanical or thermal penalties.

ESH337M016AG3AA (KEMET) provides a direct equivalent from an alternative manufacturer. This part matches the original UHM1C331MPD specification exactly (330 µF, 16 V, 2000 Hrs @ 105°C) with Active product status and RoHS3 compliance. Mechanical dimensions are compatible (0.492" height versus 0.512" original), and lead spacing matches at 0.138" (4.60 mm).

For Extended Reliability Requirements:

UHV1C331MPD and UHV1E331MPD offer 6000 Hrs lifetime @ 105°C, suitable for applications requiring extended operational life. Both maintain compatible mechanical dimensions and lead spacing. UHV1C331MPD preserves the 16 V rating, while UHV1E331MPD provides 25 V rating.

UHE1C331MPD delivers the highest lifetime rating (7000 Hrs @ 105°C) among Nichicon substitutes. Height is reduced to 0.453" (11.50 mm), which may be advantageous in space-constrained designs. This part is suitable only if the reduced height does not conflict with PCB layout requirements.

For Extended Temperature Range:

UKA1C331MPD and UKA1E331MPD extend the lower operating temperature limit to -55°C, compared to -40°C for the original part. These parts are designated for Audio applications and maintain compatible mechanical specifications. UKA1C331MPD preserves 16 V rating with 2000 Hrs lifetime, while UKA1E331MPD provides 25 V rating.

Parts Not Recommended for New Designs:

UHD1C331MPD, UHE1C331MPD, UHV1C331MPD, UHV1E331MPD, UKA1C331MPD, UKA1E331MPD, and UPS1C331MPD are designated "Not For New Designs." These parts are suitable only for replacement in existing equipment or legacy system support. For new product development, select UPA1C331MPD, UPA1E331MPD, or ESH337M016AG3AA.

Frequently Asked Questions (FAQ)

Q: Can UPA1E331MPD (25 V) replace UHM1C331MPD (16 V) in my circuit?

A: Yes. The higher voltage rating (25 V versus 16 V) is electrically compatible and provides additional design margin. All other parameters—capacitance (330 µF), tolerance (±20%), mechanical dimensions, and lead spacing—are identical. The circuit will function correctly with no modifications required.

Q: What is the difference between UPA1C331MPD and ESH337M016AG3AA?

A: Both parts are electrically equivalent (330 µF, 16 V, ±20% tolerance, 2000 Hrs @ 105°C). UPA1C331MPD is manufactured by Nichicon with Active status and RoHS3 compliance. ESH337M016AG3AA is manufactured by KEMET with Active status and RoHS3 compliance. The primary difference is manufacturer. ESH337M016AG3AA has a slightly reduced height (0.492" versus 0.512"), which may be beneficial in space-constrained layouts. Both are suitable for new designs.

Q: Why is UHM1C331MPD obsolete, and what should I do?

A: Obsolete status indicates the part is no longer manufactured. Existing inventory may be available from distributors, but long-term supply cannot be guaranteed. For new designs or ongoing production, transition to UPA1C331MPD or ESH337M016AG3AA, both of which are Active and offer equivalent or improved specifications.

Q: Can I use UHE1C331MPD if my PCB has limited vertical space?

A: UHE1C331MPD has a reduced height of 0.453" (11.50 mm) compared to 0.512" for the original part. If your PCB clearance allows this reduced height, the part is mechanically compatible. However, verify that the 0.059" height reduction does not create unintended gaps or mechanical stress on solder joints. This part is designated "Not For New Designs," so use only for replacement applications.

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

A: This designation indicates the part is in mature or declining production phase. While the part remains available and functional, the manufacturer recommends using newer alternatives for new product development. Existing inventory may be limited, and long-term availability is not guaranteed. For new designs, select parts with "Active" status such as UPA1C331MPD or ESH337M016AG3AA.

Q: Are all substitute parts RoHS3 compliant?

A: UPA1C331MPD, UPA1E331MPD, UHD1C331MPD, UHE1C331MPD, UHV1C331MPD, UHV1E331MPD, UKA1C331MPD, UKA1E331MPD, UPS1C331MPD, and ESH337M016AG3AA are all RoHS3 compliant. The original UHM1C331MPD does not specify RoHS status. All substitute parts meet modern environmental and regulatory requirements.

Q: Can I mix different substitute parts in the same circuit board?

A: Yes, provided all parts meet the circuit's electrical requirements (330 µF, minimum 16 V rating, ±20% tolerance). Mixing parts from different manufacturers (Nichicon and KEMET) or different series is acceptable from an electrical standpoint. However, for manufacturing consistency and traceability, using a single part number across a production run is recommended.

Q: What is the significance of lead spacing (0.138" / 4.60 mm)?

A: Lead spacing determines PCB hole pattern compatibility. All substitute parts maintain 0.138" (4.60 mm) lead spacing, ensuring direct mechanical compatibility with PCBs designed for the original UHM1C331MPD. No PCB redesign is required.

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