Toshiba Semiconductor and Storage TK11A65W,S5X

Overview

TK11A65W from Toshiba Electronic Devices & Storage Corporation is a silicon N-channel super-junction MOSFET designed for high-voltage switching in offline power supplies. It delivers 650 V drain-source breakdown voltage, 11.1 A DC drain current, and low R_DS(ON) of 0.33 Ω (typ.) at V_GS = 10 V, enabling efficient operation in AC-DC adapters and industrial SMPS.

For engineers reviewing the TK11A65W datasheet, TK11A65W pinout, TK11A65W application, or TK11A65W equivalent, this device is selected for high-efficiency, high-reliability 650 V primary-side switching where low conduction loss, avalanche ruggedness (E_AS = 178 mJ), and gate drive simplicity are critical design requirements.

Technical Context

The TK11A65W employs Toshiba's DTMOS™ (Double-diffused Trench MOS) super-junction architecture to achieve high voltage blocking with low on-resistance. Its enhancement-mode gate threshold (V_th = 2.5–3.5 V) ensures compatibility with standard 10 V gate drivers and enables clean turn-on without external biasing.

Dynamic performance is characterized by C_iss = 890 pF, Q_g = 25 nC, and fast switching times (t_r = 23 ns, t_f = 5.5 ns), supporting high-frequency operation up to several hundred kHz. The integrated body diode exhibits t_rr = 230 ns and Q_rr = 2.3 µC, suitable for hard-switched flyback and LLC resonant topologies.

Key Specifications

Pinout & Package

TK11A65W is housed in a TO-220SIS (JEITA SC-67) package - a surface-mount compatible variant of TO-220 with isolated drain tab, enabling direct PCB mounting without insulating hardware. Thermal resistance R_th(ch-c) is 3.57 °C/W, supporting up to 35 W power dissipation at T_c = 25 °C.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-voltage MOSFET applications.

Compared with STP12N65M2 and IPP65R041C7, the TK11A65W offers superior avalanche ruggedness, lower gate charge, and a thermally optimized isolated package-making it preferred for high-reliability, high-surge industrial power supplies where layout simplicity and transient immunity are prioritized over ultra-low R_DS(ON).

Availability

TK11A65W is available at Aetrix Electronics and suitable for industrial AC-DC power supplies, LED driver primary switches, and server auxiliary power converters requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.

Supply support for TK11A65W includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Toshiba Electronic Devices & Storage Corporation is a global semiconductor manufacturer specializing in power devices, logic ICs, and storage solutions, with core expertise in silicon power MOSFETs and IGBTs since the 1980s.

The TK11A65W belongs to Toshiba's DTMOS™ IV super-junction MOSFET family, engineered specifically for high-efficiency, high-reliability offline switching power supplies targeting industrial, computing, and lighting applications.

FAQ

What is the maximum continuous drain current rating for TK11A65W?

The TK11A65W is rated for 11.1 A DC drain current at T_c = 25 °C. This rating assumes proper heatsinking to maintain case temperature; derating is required above 25 °C per the R_th(ch-c) = 3.57 °C/W specification. At T_c = 100 °C, the usable DC current drops to approximately 6.2 A to keep channel temperature ≤150 °C.

Does TK11A65W have an isolated drain tab, and why does it matter?

Yes, the TK11A65W uses a TO-220SIS package with electrically isolated drain tab rated for 2000 V_RMS. This isolation eliminates the need for insulating hardware (e.g., mica washers) when mounting to grounded heatsinks-reducing assembly cost, improving thermal reliability, and simplifying compliance with safety standards like UL 62368-1.

What is the typical gate threshold voltage range for TK11A65W, and how does it affect drive circuit design?

The TK11A65W has a gate threshold voltage range of 2.5–3.5 V at V_DS = 10 V and I_D = 0.45 mA. This tight V_th window ensures predictable turn-on with standard 10 V gate drivers and avoids unintended conduction near 0 V. No negative gate bias is required for robust off-state operation, simplifying driver design.

Can TK11A65W replace older 600 V MOSFETs in existing designs without layout changes?

TK11A65W uses the same TO-220SIS footprint and pinout (G-D-S) as legacy Toshiba 600 V devices like TK10A60D, but its 650 V rating and improved R_DS(ON) provide headroom for higher input voltages and efficiency gains. Layout changes are not required if thermal and gate drive margins are verified-but note the higher E_AS and dv/dt ruggedness improve system robustness.

What is the significance of the 178 mJ single-pulse avalanche energy rating for TK11A65W?

The 178 mJ E_AS rating means TK11A65W can safely absorb transient overvoltage energy-such as from transformer leakage inductance spikes or line surges-without failure. This eliminates or reduces reliance on external RCD clamp circuits in flyback and forward converters, lowering component count and improving power density in compact designs.