The D13009K (commonly marked as 3DD13009K / KSE13009L) is a high-voltage, high-speed NPN silicon power bipolar junction transistor housed in a heavy-duty TO-247 (TO-3P) through-hole package. Specifically engineered for high-frequency switch-mode power conversion, the D13009K features a high collector-emitter breakdown voltage of 400V (with V_CBO up to 700V), a continuous collector current rating of 12A, low saturation voltage, and fast switching fall times. It is widely used in high-power ATX switch-mode power supplies (SMPS), electronic ballasts, fluorescent lighting inverters, and high-voltage motor drives.

Specifications

• Brand / Manufacturer: Fairchild / ON Semiconductor / JILIN SINO-MICROELECTRONICS / Industry Standard
• Part Number / Marking: D13009K / 3DD13009K / KSE13009
• Transistor Type: High-Voltage Fast-Switching NPN Power BJT
• Collector-Base Voltage (V_CBO): 700V
• Collector-Emitter Voltage (V_CEO): 400V
• Emitter-Base Voltage (V_EBO): 9.0V
• Continuous Collector Current (I_C): 12A
• Pulsed Collector Current (I_CM): 24A
• Continuous Base Current (I_B): 6.0A
• DC Current Gain (h_FE): 8 to 40 (at I_C = 5.0A, V_CE = 5.0V) / 6 to 30 (at I_C = 8.0A, V_CE = 5.0V)
• Collector-Emitter Saturation Voltage (V_CE(sat)): < 1>C = 5.0A, I_B = 1.0A) / < 1>C = 8.0A, I_B = 1.6A)
• Base-Emitter Saturation Voltage (V_BE(sat)): < 1>C = 5.0A, I_B = 1.0A)
• Transition Frequency (f_T): Approx. 4.0 MHz (Minimum at I_C = 0.5A, V_CE = 10V)
• Fall Time (t_f): Approx. 0.2µs to 0.7µs (Fast inductive load turn-off)
• Total Power Dissipation (P_D): Up to 100W to 130W (at T_C = 25°C with heatsink)
• Operating Junction & Storage Temperature: -65°C to +150°C
• Package / Case: TO-247 / TO-3P (3-Pin Through-Hole: Pin 1: Base, Pin 2: Collector, Pin 3: Emitter, Mounting Tab: Collector)

Features

• High Reverse Voltage Withstand: 700V collector-base blocking voltage makes it resilient against high-voltage inductive spikes and offline AC line transients.
• High Current Handling: Delivers continuous current capability up to 12A (24A pulsed) for high-wattage primary power stages.
• Fast Switching Speeds: Low storage and fall times optimize efficiency and minimize switching losses in high-frequency SMPS topologies up to 100kHz.
• Heavy-Duty TO-247 Package: Large thermal mounting tab provides superior heat transfer and thermal stability compared to TO-220 packages under continuous heavy loads.
• Optimized Switching Linearity: Engineered with planar diffusion technology to ensure stable reverse bias safe operating area (RBSOA).

Common Applications

• Switch-Mode Power Supplies (SMPS): Primary half-bridge and push-pull switching transistors in high-wattage ATX computer power supplies and industrial DC power units.
• Electronic Ballasts & Lighting: High-frequency resonant inverters for compact fluorescent lamps (CFL) and HID lighting circuits.
• High-Voltage Inverters & Converters: DC-to-AC power conversion and high-voltage step-down/step-up converter topologies.
• Industrial Motor Drives: High-voltage PWM switching and speed control for AC/DC motors and inductive actuators.
• Uninterruptible Power Supplies (UPS): Offline inverter switching stages for battery-backup power systems.

Usage Tips

• Heatsink Mounting: Always mount the TO-247 tab securely to an aluminum heatsink using thermal grease; use an insulating mica/silicone pad and bushing if the heatsink must remain electrically isolated (Tab is internally connected to Collector).
• Base Drive Optimization: Provide an adequate base drive current (I_B ≈ I_C / 5 to I_C / 8) to ensure deep saturation; using a proportional base-drive transformer or negative turn-off bias will significantly reduce storage time and switching losses.
• Snubber Circuit Protection: When driving inductive transformers or coils, always incorporate a primary RCD snubber network across the collector to clamp transient inductive spikes below the 700V rating.
• Base-to-Emitter Resistor: Connect a low-value resistor (e.g., 22Ω to 100Ω) or reverse anti-parallel diode across the Base and Emitter to speed up carrier evacuation during turn-off and prevent false triggering.

Datasheet