Is there a pin-compatible replacement for KM686M400K25RR0VH2FP0?

No pin-to-pin compatible replacement is confirmed. While candidates have radial leads, differences in package size or electrical values prevent a drop-in recommendation without review.

What risks should I check before replacing KM686M400K25RR0VH2FP0?

Key risks include: 1) Package mismatch, where a larger diameter may not fit on the board. 2) Capacitance mismatch, which can affect circuit timing, stability, or filtering performance.

KM686M400K25RR0VH2FP0 Alternatives, Datasheet & Cross Reference | Chengx

Finding a substitute for the CX KM686M400K25RR0VH2FP0 68µF 400V capacitor requires careful review of both electrical parameters and physical dimensions. Alternatives exist but may have different capacitance values or package sizes that need engineering validation.

AI replacement insight

Package riskhigh

Several candidates have different diameters, which is a primary cause of incompatibility on a PCB.

Electrical riskmedium

Some candidates have lower capacitance, which can impact circuit performance and stability.

Can it be replaced directly?

No direct, drop-in replacement has been identified. All reviewed candidates have significant electrical or physical differences requiring engineering review.

Best replacement path

Find a 68µF, 400V+ capacitor in a 16mm x 25mm radial package. EWH2WM680M20OT is electrically similar but physically larger, posing a fit risk.

Main risk

The main risks are physical incompatibility due to different package dimensions and circuit malfunction from mismatched capacitance values.

Recommended alternatives

Strong electrical match but larger package requires physical fit verification.

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Alternative comparison matrix

Feature / factor	KM686M400K25RR0VH2FP0	EWH2WM680M20OT	ERH2WM470L25OT	Compatibility / risk
Capacitance	68µF	68µF	47µF	68µF / 47µF — Capacitance matches.; ERH2WM470L25OT: Candidate has ~31% lower capacitance.
Voltage	400V	450V	450V	450V — Higher voltage rating provides more margin.; ERH2WM470L25OT: Higher voltage rating provides more margin.
Package	Radial, 16mm x 25mm	Radial, 18mm x 20mm	Radial, 16mm x 25mm	Radial, 18mm x 20mm / Radial, 16mm x 25mm — Larger diameter (18mm vs 16mm) may not fit.; ERH2WM470L25OT: Package dimensions match.
Endurance	2000h @ 105°C	2000h @ 105°C	3000h @ 105°C	2000h @ 105°C / 3000h @ 105°C — Endurance matches.; ERH2WM470L25OT: Longer rated life.

Application & sourcing insights

Questions & answers

EWH2WM680M20OT is a strong electrical match but has a larger 18mm diameter. ERH2WM470L25OT has the same package but lower 47µF capacitance. Both require review.