UCX1A331MCS1GS Equivalent & Substitute Parts

Part Overview

The UCX1A331MCS1GS is a 330 µF, 10 V aluminum electrolytic capacitor in surface mount radial can package manufactured by Nichicon. This component is classified as "Not For New Designs," indicating it has reached end-of-life status. Organizations using this part in active production or maintenance applications require equivalent or upgraded alternatives to ensure supply chain continuity and long-term component availability.

Key Parameters

Parameter	Value
Capacitance	330 µF
Voltage Rating	10 V
Tolerance	±20%
ESR @ 100 kHz	150 mOhm
Lifetime @ 135°C	2000 Hrs
Operating Temperature Range	-40°C ~ 135°C
Package Type	Radial, Can - SMD
Case Diameter	10.00 mm
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the UCX1A331MCS1GS is determined by the following criteria:

Direct Equivalents maintain identical electrical specifications: 330 µF capacitance, ±20% tolerance, 10 V voltage rating, 150 mOhm ESR, 2000 Hrs @ 135°C lifetime, and identical package dimensions (10.00 mm diameter, surface mount radial can).

Voltage-Upgraded Alternatives increase the rated voltage from 10 V to 16 V or 25 V while maintaining all other electrical parameters (330 µF, ±20% tolerance, 150 mOhm ESR, 2000 Hrs @ 135°C). These parts are electrically compatible in applications where the original 10 V rating provides adequate margin, as higher voltage ratings are backward-compatible with lower voltage circuit requirements.

Package Variants include minor height differences (10.50 mm vs. 10.80 mm seated height) while maintaining the same 10.00 mm diameter and surface mount land size (10.30 mm × 10.30 mm). These variants are mechanically compatible with standard PCB layouts designed for the original part.

Parameter Comparison

Part Number	Manufacturer	Capacitance	Voltage Rating	Tolerance	ESR @ 100 kHz	Lifetime @ 135°C	Case Diameter	Height (Max)	Inventory Status
UCX1A331MCS1GS	Nichicon	330 µF	10 V	±20%	150 mOhm	2000 Hrs	10.00 mm	10.80 mm	1433 Pcs
UCX1A331MCL1GS	Nichicon	330 µF	10 V	±20%	150 mOhm	2000 Hrs	10.00 mm	10.50 mm	799 Pcs
UCX1C331MCL1GS	Nichicon	330 µF	16 V	±20%	150 mOhm	2000 Hrs	10.00 mm	10.50 mm	1452 Pcs
UCX1C331MCS1GS	Nichicon	330 µF	16 V	±20%	150 mOhm	2000 Hrs	10.00 mm	10.80 mm	1221 Pcs
UCX1E331MCL1GS	Nichicon	330 µF	25 V	±20%	150 mOhm	2000 Hrs	10.00 mm	10.50 mm	1202 Pcs

Engineering Selection Recommendations

For Direct Replacement: UCX1A331MCL1GS provides identical electrical performance with a 0.30 mm reduction in seated height. This variant is suitable for space-constrained PCB layouts while maintaining full electrical equivalence.

For Voltage Margin Enhancement: UCX1C331MCS1GS or UCX1C331MCL1GS (16 V rating) offer increased voltage headroom for applications requiring additional safety margin. These parts are electrically interchangeable in circuits designed for 10 V operation.

For Maximum Voltage Margin: UCX1E331MCL1GS (25 V rating) provides the highest voltage rating among available substitutes, suitable for applications where circuit voltage may approach or exceed the original 10 V specification.

All substitute parts maintain ROHS3 compliance, MSL 1 rating, and identical capacitance, tolerance, ESR, and thermal lifetime specifications. Selection between alternatives depends on PCB height constraints and required voltage margin rather than electrical performance differences.

Frequently Asked Questions (FAQ)

Q: Can UCX1C331MCS1GS replace UCX1A331MCS1GS directly? A: Yes. The 16 V rating is backward-compatible with 10 V circuit requirements. All other electrical parameters (330 µF, ±20% tolerance, 150 mOhm ESR, 2000 Hrs @ 135°C) are identical. Seated height remains 10.80 mm.

Q: What is the difference between UCX1A331MCS1GS and UCX1A331MCL1GS? A: Both parts are 10 V, 330 µF equivalents with identical electrical specifications. The primary difference is seated height: MCS1GS is 10.80 mm, while MCL1GS is 10.50 mm. Select MCL1GS for space-constrained layouts.

Q: Are all substitute parts surface mount compatible with the original PCB footprint? A: Yes. All substitute parts maintain the same 10.00 mm case diameter and 10.30 mm × 10.30 mm surface mount land size. Height variations (10.50 mm vs. 10.80 mm) do not affect PCB footprint compatibility.

Q: Why are there multiple voltage ratings available? A: Higher voltage ratings (16 V, 25 V) provide increased safety margin in applications where circuit voltage may fluctuate or where design margin is required. These parts are electrically interchangeable with the original 10 V specification.

Q: Do all substitute parts have the same thermal lifetime? A: Yes. All listed alternatives maintain 2000 Hrs @ 135°C lifetime rating, identical to the original UCX1A331MCS1GS.

Q: What does "Not For New Designs" status mean for substitution? A: This status indicates the original part has reached end-of-life. All listed substitutes carry the same status, confirming they are from the same product family and lifecycle phase. For new designs, consult current-generation capacitor families.

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