ULD1A331MPD Equivalent & Substitute Parts

Part Overview

The Nichicon ULD1A331MPD is a 330 µF, 10 V aluminum electrolytic capacitor in radial, can package rated for 10,000 hours at 105°C. This component is classified as Not For New Designs, making identification of equivalent and substitute parts essential for ongoing maintenance, repair, and legacy system support. Equivalent parts maintain identical electrical and mechanical specifications, while substitute parts may offer enhanced ratings or improved product status for new applications.

Key Parameters

Parameter	Value
Capacitance	330 µF
Voltage Rating	10 V
Tolerance	±20%
Lifetime @ Temperature	10,000 Hrs @ 105°C
Operating Temperature Range	-40°C ~ 105°C
Polarization	Polar
Lead Spacing	0.138" (4.60 mm)
Package / Case	Radial, Can
Mounting Type	Through Hole
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution for the ULD1A331MPD is determined by the following critical parameters:

Capacitance: 330 µF (exact match required)
Voltage Rating: Minimum 10 V (equal or higher acceptable)
Tolerance: ±20% (standard for aluminum electrolytic capacitors)
Polarization: Polar (radial configuration)
Lead Spacing: 0.138" (4.60 mm)
Package Type: Radial, Can
Mounting Type: Through Hole
Lifetime Rating: 10,000 Hrs @ 105°C (minimum requirement)
Operating Temperature: -40°C ~ 105°C

Two substitute parts meet these criteria:

ELE-100ELL331MHB5D (Chemi-Con): Direct equivalent with identical electrical and mechanical specifications. Product status is Active, providing improved availability and supply chain continuity.
ESL337M025AGMAA (KEMET): Upgrade substitute with higher voltage rating (25 V vs. 10 V). Maintains all other critical parameters while offering enhanced performance margin and active product status.

Parameter Comparison

Parameter	ULD1A331MPD (Nichicon)	ELE-100ELL331MHB5D (Chemi-Con)	ESL337M025AGMAA (KEMET)
Capacitance	330 µF	330 µF	330 µF
Voltage Rating	10 V	10 V	25 V
Tolerance	±20%	±20%	±20%
Lifetime @ Temperature	10,000 Hrs @ 105°C	10,000 Hrs @ 105°C	10,000 Hrs @ 105°C
Operating Temperature	-40°C ~ 105°C	-40°C ~ 105°C	-40°C ~ 105°C
Lead Spacing	0.138" (4.60 mm)	0.138" (4.60 mm)	0.138" (4.60 mm)
Size / Dimension	0.315" Dia (8.00 mm)	0.315" Dia (8.00 mm)	0.315" Dia (8.00 mm)
Height - Seated (Max)	0.531" (14.60 mm)	0.512" (13.00 mm)	0.531" (14.60 mm)
Package / Case	Radial, Can	Radial, Can	Radial, Can
Mounting Type	Through Hole	Through Hole	Through Hole
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Not For New Designs	Active	Active

Engineering Selection Recommendations

For Direct Replacement (Legacy System Maintenance): The Chemi-Con ELE-100ELL331MHB5D is the preferred direct equivalent. It maintains identical electrical specifications and mechanical footprint while offering Active product status, ensuring long-term availability and supply chain reliability. Height difference of 0.019" (0.50 mm) is within standard PCB layout tolerances.

For Performance Enhancement (New Designs or System Upgrades): The KEMET ESL337M025AGMAA provides an upgrade path with 25 V voltage rating, delivering improved performance margin in applications where the original 10 V specification allows headroom. This part maintains identical capacitance, tolerance, and thermal characteristics while offering Active product status and ROHS3 compliance.

Both substitute parts are ROHS3 compliant and suitable for applications requiring regulatory compliance. Selection between direct equivalent and upgrade substitute depends on circuit voltage requirements and design margin considerations.

Frequently Asked Questions (FAQ)

Q: Can the ELE-100ELL331MHB5D be used as a direct replacement for the ULD1A331MPD? A: Yes. Both parts share identical capacitance (330 µF), voltage rating (10 V), tolerance (±20%), lead spacing (4.60 mm), and package type (Radial, Can). The 0.019" height difference is within standard PCB layout tolerances and does not affect electrical performance or mechanical fit.

Q: What is the advantage of using the ESL337M025AGMAA over the direct equivalent? A: The ESL337M025AGMAA offers a higher voltage rating (25 V vs. 10 V) while maintaining all other critical specifications. This provides additional performance margin in circuits where voltage headroom is beneficial. Both parts are Active products with improved supply chain availability compared to the original Not For New Designs status.

Q: Are all three parts pin-compatible? A: Yes. All three parts feature identical lead spacing (0.138" / 4.60 mm) and radial, can package configuration, ensuring direct PCB compatibility without layout modifications.

Q: Do the substitute parts meet the same compliance requirements? A: Yes. Both ELE-100ELL331MHB5D and ESL337M025AGMAA are ROHS3 compliant, matching the original ULD1A331MPD specification. Both are classified as REACH Unaffected or REACH Affected as documented in their respective datasheets.

Q: Can the 25 V rated ESL337M025AGMAA be used in a circuit designed for 10 V operation? A: Yes. A higher voltage-rated capacitor can be used in lower voltage applications without electrical degradation. The 25 V rating provides additional safety margin and is electrically compatible with 10 V circuit requirements.

Q: What is the difference in ripple current handling between the parts? A: The ESL337M025AGMAA handles higher ripple currents (482.5 mA @ 120 Hz, 965 mA @ 100 kHz) compared to the ULD1A331MPD and ELE-100ELL331MHB5D (231 mA @ 120 Hz, 330 mA @ 100 kHz). This enhanced capability is a result of its higher voltage rating and does not affect compatibility in standard applications.

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