Is there a pin-compatible replacement for P4SMA6.8A?

Yes, parts like SMAJ6.0A and SMAJ6.5A are available in the same SMA (DO-214AC) package and are pin-compatible. However, their electrical parameters differ, so they are not drop-in replacements without review.

What risks should I check before replacing P4SMA6.8A?

The main risks are using a replacement with a higher standoff voltage (Vrwm), which reduces protection, or a lower peak pulse current (Ipp), which can lead to failure under surge conditions. Also, ensure the replacement is unidirectional, not bidirectional.

P4SMA6.8A Alternatives, Datasheet & Cross Reference | BOURNS

P4SMA6.8A is a 400W, 5.8V unidirectional TVS diode in an SMA package. Finding a replacement requires matching its unidirectional polarity, 5.8V standoff voltage, and 39A peak current rating.

AI replacement insight

Electrical riskmedium

Using a part with higher Vrwm or lower Ipp degrades protection.

Package risklow

The DO-214AC (SMA) package is standardized and widely available.

Can it be replaced directly?

No exact drop-in replacement was found. SMAJ6.0A is a strong functional alternative that requires review of its slightly different voltage and current ratings.

Best replacement path

Find a unidirectional TVS with Vrwm <= 5.8V and Ipp >= 39A in a DO-214AC package. SMAJ6.0A is a close parametric match that should be evaluated.

Main risk

Reduced circuit protection due to a replacement part having a higher standoff voltage or a lower peak current rating.

Recommended alternatives

A strong functional alternative in the same package with very similar electrical ratings; requires engineering review.

View details

Alternative comparison matrix

Feature / factor	P4SMA6.8A	SMAJ6.0A	SMAJ6.5A	Compatibility / risk
Package	DO-214AC (SMA)	DO-214AC (SMA)	DO-214AC (SMA)	DO-214AC (SMA) — Package is form-factor compatible.; SMAJ6.5A: Package is form-factor compatible.
Polarity Or Type	Unidirectional	Unidirectional	Unidirectional	Unidirectional — Polarity matches target.; SMAJ6.5A: Polarity matches target.
Voltage V	5.8V	6.0V	6.5V	6.0V / 6.5V — Slightly higher standoff voltage may offer less protection.; SMAJ6.5A: Higher standoff voltage significantly reduces protection margin.
Current A	39.0A	38.8A	35.7A	38.8A / 35.7A — Slightly lower peak pulse current rating.; SMAJ6.5A: Lower peak pulse current rating reduces surge survivability.
Power W	400W	400W	-	400W — Peak pulse power matches.

Application & sourcing insights

Questions & answers

The closest functional alternative is SMAJ6.0A, which has very similar electrical characteristics but a slightly higher standoff voltage (6.0V) and marginally lower peak current rating (38.8A). This requires engineering verification.