Is there a pin-compatible replacement for 450CXW120MEFR18X31.5?

No candidate has been confirmed as a direct pin-compatible replacement. While several options have a 2-pin radial package, their physical dimensions (diameter and height) differ from the original. KCXL4502W101MF is the closest functional match, but requires datasheet verification.

What risks should I check before replacing 450CXW120MEFR18X31.5?

Before replacing, you must check three main risks: 1) Electrical: Ensure the voltage rating is at least 450V. 2) Parametric: Verify if the change in capacitance (e.g., 100µF vs 120µF) is acceptable for your circuit's performance. 3) Physical: Confirm the substitute's diameter and height will fit on your PCB.

450CXW120MEFR18X31.5 Alternatives, Datasheet & Cross Reference | rubycon

Find and compare alternatives for the Rubycon 450CXW120MEFR18X31.5, a 120µF 450V radial aluminum electrolytic capacitor. This guide analyzes potential substitutes, highlighting key differences in voltage, capacitance, and package size to help you make an informed decision.

AI replacement insight

Electrical riskhigh

Using a part with lower voltage is unsafe. Capacitance changes can affect timing or filtering performance.

Package riskmedium

Several candidates have different diameters or heights, which may not fit on the PCB.

Sourcing risklow

Alternatives are available from multiple manufacturers.

Can it be replaced directly?

No direct drop-in replacement was found. All candidates have parametric or physical differences requiring engineering review.

Best replacement path

The most promising alternative is KCXL4502W101MF, which matches the 450V rating. However, its capacitance is lower (100µF vs 120µF) and its physical dimensions must be verified from the datasheet before use.

Main risk

The main risks are electrical stress from using a lower voltage part, circuit malfunction from incorrect capacitance, and assembly issues from a non-matching package size.

Recommended alternatives

A promising alternative with matching voltage but lower capacitance; requires package verification.

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Alternative comparison matrix

Feature / factor	450CXW120MEFR18X31.5	KCXL4502W101MF	ERT187M2WL40RR	Compatibility / risk
Voltage	450V	450V	450V	450V — Voltage rating matches the target.; ERT187M2WL40RR: Voltage rating matches the target.
Capacitance	120µF	100µF	180µF	100µF / 180µF — Capacitance is ~17% lower, may be acceptable in some applications.; ERT187M2WL40RR: Capacitance is 50% higher, may alter circuit behavior.
Package	Radial, Can (18mm x 31.5mm)	Radial	18mm x 40mm	Radial / 18mm x 40mm — Physical dimensions (DxL) must be verified from datasheet.; ERT187M2WL40RR: Taller than target (40mm vs 31.5mm), check clearance.
Tolerance	±20%	±20%	±20%	±20% — Tolerance matches the target.; ERT187M2WL40RR: Tolerance matches the target.

Application & sourcing insights

Questions & answers

The most promising alternative is Ymin's KCXL4502W101MF. It has the same 450V rating but a slightly lower capacitance of 100µF. You must verify its physical dimensions from the datasheet to ensure it fits your design.