B340Q-13-F Schottky Diode for Avalon A850 Control Board
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B340Q-13-F Schottky Barrier Rectifier | 40V / 3A SMD Replacement for Avalon A850 Control Board Repair
The B340Q-13-F is a 40V / 3A surface-mount Schottky barrier rectifier used on the Avalon A850 control board for polarity protection, freewheeling, and switching-diode functions on the local low-voltage rails. Silk-screen marking B340 for easy identification on the board.
Why Schottky here: the low 500mV forward voltage drop and fast recovery characteristics keep dissipation and switching losses low on rails carrying up to 3A continuous. A guard-ring mold structure adds transient protection — important on a control board exposed to upstream switching noise from the buck converter and the surrounding PSU primary.
When to Replace the B340Q-13-F
- Local rail dead on the Avalon A850 control board — failed Schottky breaking the freewheeling or protection path.
- Shorted junction reading on diode-test — absorbed a transient beyond rated voltage.
- Visible damage on the SMD package — cracking, blackening, or pad-level burn.
- Excessive heat on the diode under load — degraded junction with rising forward drop.
- Polarity-protection failure after a wrong-way connection attempt — diode took the hit, replace before re-energising.
B340Q-13-F Schottky Diode Specifications
| Feature | Specification |
|---|---|
| Part Number | B340Q-13-F |
| Silk Marking | B340 |
| Diode Type | Schottky barrier rectifier |
| Reverse Voltage | 40V |
| Forward Current | 3A |
| Forward Voltage Drop (Vf) | 500mV (typical) |
| Structure | Guard-ring mold (transient protection) |
| Mounting Type | Surface mount (SMD) |
| Typical Functions | Polarity protection / freewheeling / switching diode |
| Suitable For | Low-voltage, high-frequency inverter circuits |
| Compatible Board | Avalon A850 control board |
| Condition | Brand New |
FAQ — B340Q-13-F Schottky
Q: How do I identify the B340Q-13-F on the Avalon A850 board?
A: Silk-screen marking B340 on the SMD package. The "Q" suffix in the part number indicates the guard-ring construction — same footprint and pinout as plain B340 variants, but with the added transient-protection structure.
Q: How do I test the diode in-circuit?
A: Power off, isolated from mains. DMM diode-test mode across the diode leads. Healthy reads ~0.3-0.5V forward (Schottky low Vf), OL reverse. Shorted reads 0Ω both directions. Open reads OL both directions.
Q: Substitute a 60V Schottky for higher safety margin?
A: Possible if Vf and package footprint match, but the guard-ring structure of the B340Q-13-F is specifically there to absorb transients on this rail. A plain 60V Schottky without the guard ring may have less robust transient response — match the exact part for the Avalon A850 application.
Q: Bulk pricing for repair benches?
A: Yes — email contact@lys-sz.com for reel-quantity B340Q-13-F pricing.
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Avalon A850 control board repair benches stocking B340Q-13-F by the reel? Email contact@lys-sz.com for bulk pricing. Worldwide shipping from our Shenzhen warehouse.
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