Is there a pin-compatible replacement for SMFJ18CA?

Yes, SMF18CA is considered a pin-compatible replacement as it shares the same 2-pin SOD-123FL package and key electrical specifications. Final verification of the PCB layout is recommended.

What risks should I check before replacing SMFJ18CA?

Key risks include mismatched polarity (uni-directional vs. bi-directional), incorrect reverse standoff voltage (VR), and lower peak pulse current (IPP). Using a part with lower VR can cause premature clamping, while higher VR reduces protection.

SMFJ18CA Alternatives, Datasheet & Cross Reference | BORN

Finding a replacement for the SMFJ18CA, a 200W, 18V bi-directional TVS diode in a SOD-123FL package, involves matching key protection parameters. Several alternatives exist with varying degrees of compatibility.

AI replacement insight

Electrical risklow

Low for SMF18CA, medium for others due to voltage/current differences.

Package risklow

All recommended alternatives use the same SOD-123FL package.

Sourcing risklow

Alternatives are available from multiple manufacturers, improving availability.

Can it be replaced directly?

Yes, SMF18CA is a direct replacement for SMFJ18CA, offering matching package, polarity, and key electrical ratings.

Best replacement path

The most direct path is using SMF18CA, which is a cross-vendor equivalent with matching form, fit, and function.

Main risk

The main risk is selecting a part with incorrect polarity or a reverse standoff voltage that is incompatible with the circuit's normal operating voltage.

Recommended alternatives

A strong parametric match in the same SOD-123FL package with identical voltage, power, and polarity.

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Alternative comparison matrix

Feature / factor	SMFJ18CA	SMF18CA	SMF16CA	SMF20CA	Compatibility / risk
Package	SOD-123FL	SOD-123FL	SOD-123FL	SOD-123FL	SOD-123FL — Same package and pin count.; SMF16CA: Package matches.; SMF20CA: Package matches.
Polarity	Bi-directional	Bi-directional	-	-	Bi-directional — Polarity matches target.
Voltage	18V	18V	16V	20V	18V / 16V / 20V — Reverse standoff voltage matches.; SMF16CA: Lower reverse standoff voltage.; SMF20CA: Higher standoff voltage offers less protection.
Power	200W	200W	200W	200W	200W — Peak pulse power matches.; SMF16CA: Power rating matches.; SMF20CA: Power rating matches.
Current	6.8A	6.8A - 6.85A	7.7A	6.2A	6.8A - 6.85A / 7.7A / 6.2A — Peak pulse current is equivalent.; SMF16CA: Higher peak current rating is acceptable.; SMF20CA: Lower peak current rating.

Application & sourcing insights

Questions & answers

SMF18CA is the best alternative, offering a near-identical match in package, voltage, power, and polarity. However, always verify the specific manufacturer's datasheet.