FS8205A Dual N-Channel Battery Protection MOSFET 20V 6A TSSOP-8

FS8205A Dual N-Channel Battery Protection MOSFET 20V 6A TSSOP-8 provides a high-density power management solution specifically engineered for lithium-ion battery protection circuits. This device integrates two independent N-channel enhancement mode MOSFETs into a single, ultra-thin TSSOP-8 package to save critical PCB real estate. Consequently, it offers an exceptionally low on-state resistance, which minimizes power dissipation and heat generation during high-current discharge cycles. High-precision battery protection modules frequently utilize the FS8205A to manage the charging and discharging paths effectively. Furthermore, the advanced trench technology ensures reliable switching performance even under low gate drive voltages. Therefore, you should select this MOSFET for compact portable electronics that require robust protection and high efficiency.

Key Features:

• Dual MOSFET Configuration: Contains two electrically isolated N-channel MOSFETs in one package, allowing for bidirectional current control in battery protection schemes.
• Ultra-Low R_DS(ON): Features a very low drain-source on-resistance, which reduces voltage drops across the protection circuit and extends battery life.
• High Current Capability: Supports a continuous drain current of up to 6 A, making it suitable for high-capacity power banks and mobile devices.
• Low Gate Threshold: Operates efficiently with low gate voltages, ensuring compatibility with standard battery protection ICs.
• TSSOP-8 Surface Mount Package: The slim profile and small footprint facilitate high-density assembly in modern, space-constrained electronics.

Technical Specifications:

• Drain-Source Voltage (V_DSS): 20 V
• Continuous Drain Current (I_D): 6 A (±20%)
• Static Drain-Source On-Resistance (R_DS(on)): ≈ 25 mΩ to 35 mΩ (at V_GS = 4.5 V)
• Gate-Source Voltage (V_GSS): ±12 V
• Gate Threshold Voltage (V_GS(th)): 0.5 V to 1.5 V
• Total Power Dissipation (P_D): 1.5 W (at T_A = 25°C)
• Operating Junction Temperature: −55°C to +150°C

Mechanical Specifications:

• Package Type: TSSOP-8 (Thin Shrink Small Outline Package)
• Mounting Type: Surface Mount Device (SMD/SMT)
• Number of Pins: 8 Pins
• Lead Finish: Matte Tin (Sn) or Lead-Free equivalent
• Encapsulation: Molded Plastic Compound

Dimensions:

• Body Length: ≈ 3.0 mm
• Body Width: ≈ 4.4 mm (excluding leads)
• Overall Height: ≤ 1.2 mm
• Lead Pitch: 0.65 mm
• Total Width (Lead to Lead): ≈ 6.4 mm

Pinout and Wiring:

• Pin 1 (Drain 1/2): Common Drain connection for both MOSFETs (often tied together on the PCB).
• Pin 2 (Source 1): Source terminal for the first N-channel MOSFET.
• Pin 3 (Source 1): Second connection point for Source 1 to handle higher current.
• Pin 4 (Gate 1): Control pin for the first MOSFET; connect to the protection IC discharge output.
• Pin 5 (Gate 2): Control pin for the second MOSFET; connect to the protection IC charge output.
• Pin 6 (Source 2): Source terminal for the second N-channel MOSFET.
• Pin 7 (Source 2): Second connection point for Source 2 to maximize conductivity.
• Pin 8 (Drain 1/2): Additional Common Drain terminal for thermal and current management.

Datasheet Reference:

• Download FS8205A Dual MOSFET Datasheet

Commonly Used in:

• Li-ion Battery Protection Boards: Found in almost all 1S (3.7V) protection modules for smartphones and wearables.
• BMS (Battery Management Systems): Acts as the primary switching element to prevent over-charge and over-discharge.
• Load Switches: Integrated into power distribution systems to manage low-voltage power rails.

Applications:

• Mobile Phone Batteries: Protects the internal lithium cell from hazardous electrical conditions.
• Power Banks: Manages the output current to ensure safe operation during high-speed charging.
• Portable Medical Devices: Provides reliable power switching in critical battery-operated healthcare equipment.
• Tablet and Laptop Sub-circuits: Controls power delivery to specific peripherals or internal modules.

Equivalent Models:

• DW01-series Compatible MOSFETs: Often paired with DW01A protection ICs as the standard switching pair.
• SI8205A: A functionally identical model from alternative manufacturers sharing the same pinout and voltage ratings.
• MT8205A: Another direct replacement that offers similar current handling and R_DS(ON) characteristics.

Package Includes:

• 1 x FS8205A Dual N-Channel Battery Protection MOSFET 20V 6A TSSOP-8