PESDNC2FD3V3B PA Diode - 3.3V ESD Protector for Antminer Hash Board Repair

PESDNC2FD3V3B PA ESD Protection Diode | 3.3V Bidirectional for Antminer Hashboard Repair

The PESDNC2FD3V3B (silk mark "PA") is a bidirectional 3.3V ESD protection diode in the SOD-323 (SC-76) SMD package — the standard surge-suppression diode used on Antminer hashboards to protect the 3.3V signal rails from ESD events and transient voltage spikes. When the protection diode clamps too many surge events, it eventually fails short — taking the rail with it.

Bidirectional design clamps both positive and negative transients, important on AC-coupled signal lines and bidirectional data buses. Wide operating temperature range -55°C to +150°C covers the full ASIC mining deployment envelope.

When to Replace the PESDNC2FD3V3B PA

• 3.3V signal rail shorted to ground on the hashboard — failed ESD diode is the #1 cause.
• Multimeter shows shorted junction across the diode.
• Visible damage on the SOD-323 — burnt or cracked package.
• Hashboard ESD event — preventive replacement after a known surge or static-discharge incident.

PESDNC2FD3V3B PA Diode Specifications

FAQ — PESDNC2FD3V3B PA ESD Diode

Q: How do I know it's a PESDNC2FD3V3B vs a different ESD diode?
A: Read the silk-mark on the chip top. "PA" identifies this specific PESDNC2FD3V3B variant. Other ESD diode families have different marks (e.g. "B1" for PESDUC2FD5VB, "5V" for SMBJ5.0). Match the silk mark exactly.

Q: Bidirectional vs unidirectional — does it matter?
A: Yes. Bidirectional clamps both polarity surges (needed on data lines, AC-coupled signals). Unidirectional only clamps positive surges. Always match the original part's polarity behavior — wrong choice can leave one direction unprotected.

Q: Rework profile?
A: Hot air at 320°C with flux paste. SOD-323 is tiny (1.6×1.7×0.7mm) and sensitive to thermal shock — preheat the board to 100°C before rework.

Q: Bulk pricing?
A: Yes — email contact@lys-sz.com for tape-and-reel quantities.

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Antminer hashboard repair benches stocking PA-marked ESD diodes in volume? Email contact@lys-sz.com for tape-and-reel pricing. Worldwide shipping from our Shenzhen warehouse.