SMAJ5.0A AE Diode for Avalon 850 Control Board

SMAJ5.0A (AE marking) TVS Diode | Fast-Response Surface-Mount Transient Voltage Suppression Diode in DO-214AC for Avalon 850 Control Board Repair

The SMAJ5.0A (silkscreen marking AE) is a 5.0V surface-mount TVS (Transient Voltage Suppression) diode used as the voltage transient protection across the Avalon 850 control board. Drop-in replacement when the original TVS fails: restores ESD and surge protection for the low-voltage signal lines on the Avalon 850, preventing the downstream IC damage that follows a missing TVS in production mining environments.

Packaged in DO-214AC surface-mount footprint for SMT line production and standard rework. Fast response time clamps voltage transients in nanoseconds before they reach downstream sensitive ICs. Low incremental surge resistance dissipates the surge energy without rising voltage. Matte tin lead-free plating ensures RoHS / halogen-free compliance for export markets. Leakage current typical IR < 1pA above 10V — negligible quiescent draw on the protected rail.

When to Replace the SMAJ5.0A

• Avalon 850 control board damage from a surge event — TVS sacrificed itself protecting the downstream IC, needs replacement.
• Visible damage on the TVS package — burn marks, cracking, lifted pads from a transient event.
• Probe reads short across the TVS — failed-short clamp, no longer protecting (and shorting the rail).
• Post-incident control board rework — replace TVS as standard practice when the upstream signal source was exposed to surge.
• Preventive board refurbishment — refresh TVS diodes on used Avalon 850 control boards during a complete rebuild.

SMAJ5.0A AE Specifications

FAQ — SMAJ5.0A TVS Diode

Q: What's the purpose of a TVS diode in the control board?
A: TVS diodes clamp incoming voltage transients (ESD, lightning-induced surges, switching transients from inductive loads) before they reach sensitive downstream ICs. The TVS sacrifices itself to protect the costly chips. After a surge event, the TVS is the first part to replace — it has done its job.

Q: Why "5.0A" — does that mean 5 amps?
A: No — "5.0A" in TVS nomenclature is the standoff voltage (5.0V), not current. The "A" suffix denotes unidirectional polarity. The SMAJ family handles up to 400W peak pulse power; 5.0A is suitable for protecting 5V signal rails on control boards.

Q: How do I diagnose a failed TVS in-circuit?
A: Diode-test the TVS with the board powered off. Should read like a normal Zener diode (forward voltage ~0.6V, reverse breakdown ~5V). Short on either direction = failed. Open on both directions = no protection, replace.

Q: Bulk pricing for repair shops?
A: Yes — email contact@lys-sz.com with your monthly volume. Reel and tape quantities are stocked.

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Repair shops stocking SMAJ5.0A TVS diodes by the reel? Email contact@lys-sz.com for bulk pricing. Worldwide shipping from our Shenzhen warehouse.