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8205A SOT-23-6 Dual N-Channel MOSFET Li-Ion Battery Protection (10-Pack)
8205A SOT-23-6 Dual N-Channel MOSFET Li-Ion Battery Protection (10-Pack)
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8205A SOT-23-6 Dual N-Channel MOSFET — Li-Ion Battery Protection BMS (10-Pack)
The 8205A (also marked FS8205A, S8205A) is a dual N-Channel enhancement-mode MOSFET in a SOT-23-6 surface-mount package, integrating two independent MOSFETs rated at 30V / 6A with RDS(on) of 28mΩ. It is the standard charge/discharge control MOSFET used in single-cell Li-ion and LiPo battery protection modules (BMS), paired with the DW01A or FS312F-G protection IC.
Key Specifications
| Parameter | Value |
|---|---|
| Part Number | 8205A / FS8205A / S8205A |
| Package | SOT-23-6 (SMD) |
| Configuration | Dual N-Channel MOSFET |
| V(DS) Max | 30V |
| I(D) Continuous (per channel) | 6A @ 25°C |
| RDS(on) Max | 28mΩ @ VGS=4.5V |
| VGS(th) | 0.5V – 1.5V |
| VGS Max | ±12V |
| Quantity | 10 pieces |
8205A vs 9926A — BMS MOSFET Comparison
| Feature | 8205A | 9926A |
|---|---|---|
| Package | SOT-23-6 | SOP-8 |
| V(DS) | 30V | 20V |
| I(D) | 6A | 6A |
| RDS(on) | 28mΩ | 28mΩ |
| Common BMS Pairing | DW01A, FS312F-G | DW01A, S-8261 |
BMS Circuit Function
- Q1 (Charge MOSFET) — Controlled by CO pin of DW01A; blocks reverse charging current when battery is full
- Q2 (Discharge MOSFET) — Controlled by DO pin of DW01A; disconnects load when battery is over-discharged
- Back-to-Back Configuration — Source pins connected together; body diodes face opposite directions for bidirectional blocking
Why Choose 8205A?
- 30V Rating — Higher voltage margin than 9926A (20V) for improved reliability
- 28mΩ RDS(on) — Low conduction loss; minimal heat at 1–2C discharge rates
- SOT-23-6 Package — Standard BMS PCB footprint; direct replacement for all 8205A variants
- Industry Standard — Used in virtually all 18650, LiPo, and power bank BMS modules
Typical Applications
- Single-cell Li-ion/LiPo BMS (paired with DW01A or FS312F-G)
- Power bank battery protection module
- 18650 cell protection circuit
- E-cigarette and vape battery protection
- Portable device battery management
FAQ
Q: How do I identify a failed 8205A in a BMS?
A: Measure drain-source resistance with multimeter in diode mode. A shorted 8205A reads near 0Ω in both directions. A failed open reads OL in both directions. Replace both MOSFETs together for reliability.
Q: Can 8205A replace 9926A directly?
A: Not directly — different packages (SOT-23-6 vs SOP-8). Electrically similar but PCB footprint differs. Verify package compatibility before substituting.
Package Contents
- 10× 8205A SOT-23-6 Dual N-Channel MOSFET
