Is there a pin-compatible replacement for ERT187M2WL40RR?

Currently, no pin-for-pin compatible replacement with matching key parameters has been verified. Candidates like Rubycon's 450CXW120MEFR18X31.5 have a matching footprint but differ significantly in capacitance.

What risks should I check before replacing ERT187M2WL40RR?

Key risks to check are: 1) Physical dimensions, as substitutes may be larger and not fit. 2) Capacitance value, as lower values can affect circuit stability. 3) Endurance and ripple current ratings, which impact capacitor lifetime.

ERT187M2WL40RR Alternatives, Datasheet & Cross Reference | Man Yue Technology Holdings Limited

Finding a substitute for the ERT187M2WL40RR 180µF 450V capacitor requires careful review of capacitance, voltage, and physical size. Alternatives exist but may require circuit analysis or board layout verification.

AI replacement insight

Electrical riskhigh

Candidates have significantly different capacitance values which can impact circuit stability and performance.

Package riskhigh

No exact size match found. One option is physically larger and will not fit; another is smaller but has electrical issues.

Sourcing risklow

Multiple vendors produce similar capacitors, but trade-offs are required.

Can it be replaced directly?

No direct, drop-in replacement is available. All viable candidates have significant electrical or mechanical differences.

Best replacement path

Functional alternative if space allows, otherwise parametric relaxation with significant risk.

Main risk

Physical incompatibility due to size and electrical performance degradation due to capacitance mismatch.

Recommended alternatives

Functional alternative with higher capacitance but requires verification of larger physical dimensions.

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Alternative comparison matrix

Feature / factor	ERT187M2WL40RR	ERH2WM221O46OT	450CXW120MEFR18X31.5	Compatibility / risk
Capacitance	180 µF	220 µF	120 µF	220 µF / 120 µF — Higher capacitance is often acceptable in bulk filtering, but must be verified.; 450CXW120MEFR18X31.5: Significantly lower capacitance (-33%) is a major risk to circuit performance.
Voltage	450 V	450 V	450 V	450 V — Voltage rating matches the target.; 450CXW120MEFR18X31.5: Voltage rating matches the target.
Package	18mm x 40mm	22mm x 46mm	18mm x 31.5mm	22mm x 46mm / 18mm x 31.5mm — Physically larger; will not fit in the same PCB space without modification.; 450CXW120MEFR18X31.5: Same diameter, shorter length. Should fit mechanically.
Endurance	Unknown	3000 hours	5000 hours	3000 hours / 5000 hours — Endurance rating should be compared against target datasheet and application requirements.; 450CXW120MEFR18X31.5: Higher endurance rating is a potential benefit.

Application & sourcing insights

Questions & answers

No direct drop-in replacement was found. The AISHI ERH2WM221O46OT offers similar electrical performance but is physically larger. Other options have significantly lower capacitance and require circuit validation.