The HM072N15TH, introduced by HeroMicro, is a high-performance 150V, 120A N-channel power MOSFET. It leverages advanced Trench technology to achieve an extremely low on-resistance (RDS(ON)) and ultra-low gate charge (Qg), making it ideal for high-efficiency, high-power-density switching applications. This device is a perfect choice for Switch-Mode Power Supplies (SMPS), motor drives, inverters, and battery management systems.
1. Key Features Overview
Based on the datasheet provided by HeroMicro (HM072N15TH.pdf), key specifications are:
Ultra-High Voltage & Current Capability:
Drain-Source Breakdown Voltage (VDSS): 150V
Continuous Drain Current (ID): 120A (TC=25°C), 80A (TC=100°C)
Pulsed Drain Current (IDM): Up to 600A
Industry-Leading Low Losses:
Ultra-Low On-Resistance (RDS(ON)): Typical 6.1mΩ, Max 7.2mΩ (@ VGS=10V, ID=100A)
Ultra-Low Gate Charge (Qg): Typical 83nC (@ VDD=75V, ID=100A), significantly reducing drive losses.
Exceptional Switching Performance:
Extremely Fast Switching Speed: Typical turn-on time (td(on)+tr) is only 67ns, and turn-off time (td(off)+tf) is only 78ns.
High Reliability & Thermal Performance:
Wide Operating Junction Temperature Range: -55°C to +150°C.
Very High Power Dissipation: 250W (TC=25°C).
Extremely Low Thermal Resistance: Junction-to-Case (RθJC) is only 0.5°C/W, ensuring highly efficient heat transfer to a heatsink.
Package: TO-220AB, a classic through-hole package known for its excellent thermal performance and high current handling capability.
2. Pin Configuration
The HM072N15TH uses a standard TO-220AB 3-pin package (viewed from the front with the label facing you):
| Pin | Symbol | Function |
|---|---|---|
| 1 (Left) | Gate (G) | Gate |
| 2 (Middle) | Drain (D) | Drain (connected to the metal tab) |
| 3 (Right) | Source (S) | Source |
Critical Note: The Drain (D) is internally connected directly to the metal mounting tab on the back of the package. This means the heatsink is electrically live at the drain potential! If the heatsink needs to be grounded or connected to another potential, insulating washers and bushings must be used.
3. Critical Design Guidelines
(1) Gate Drive Design
Recommended Drive Voltage (VGS): To achieve the lowest RDS(ON) and best efficiency, +10V drive is strongly recommended. Even at +8V, its RDS(ON) increases only slightly (typ. 6.3mΩ @ ID=50A).
Drive Current Capability: With a total gate charge (Qg) as high as 83nC, the driver circuit must deliver strong peak current (typically requiring a dedicated MOSFET driver IC) to enable fast switching transitions, minimizing switching losses. The datasheet test condition uses a 1.6Ω gate resistor (RG).
Preventing False Turn-On: In high dv/dt hard-switching environments (e.g., half-bridge topologies), the Miller capacitance (Crss) can cause the gate voltage of the high-side FET to rise via the "Miller effect," leading to shoot-through. Recommended countermeasures include:
Placing a small resistor (e.g., 10kΩ) between gate and source.
Using a dedicated driver IC with negative voltage turn-off or active Miller clamping.
(2) Body Diode Characteristics
The HM072N15TH has an internal body diode from Source (S) to Drain (D).
Forward Voltage (VSD): Typical 0.96V, Max 1.2V (@ ISD=100A).
Reverse Recovery: Reverse recovery time (trr) is 103ns, and reverse recovery charge (Qrr) is 330nC. This is a relatively slow body diode, which will generate significant reverse recovery losses and EMI noise in synchronous rectification applications. In hard-switching topologies, it can be used for freewheeling, but the associated losses must be accounted for.
(3) PCB Layout & Thermal Management (Critical!)
Heatsink Mounting: This is key to unlocking its 250W dissipation capability. A sufficiently large heatsink must be used with good thermal interface material (thermal paste) and proper mounting torque. Remember, the heatsink is live!
Minimize Power Loop: The high-frequency power loop, consisting of input/output capacitors, the MOSFET, and the freewheeling path, should be as short, wide, and direct as possible to minimize parasitic inductance and suppress voltage spikes (L*di/dt) during switching.
Kelvin Connection (Recommended): For precise current sensing (e.g., using a source resistor), use a separate, small-signal trace from the source pin to the sense circuit to avoid the L*di/dt voltage drop from the high current in the source trace affecting measurement accuracy.
(4) Safe Operating Area (SOA)
The "Safe Operation Area" curve on page 4 of the datasheet is the golden rule for design. It defines the safe operating boundaries under various voltage and current combinations. Pay special attention to the limitation in the linear region (left of the DC line), as prolonged operation here can easily lead to thermal runaway failure. All startup, overload, and short-circuit conditions must be confined within this curve.
(5) Absolute Maximum Ratings
Gate-Source Voltage (VGSS): ±20V. Exceeding this can cause permanent gate oxide breakdown.
Single Pulse Avalanche Energy (EAS): 276mJ. This represents the device's ability to withstand Unclamped Inductive Switching (UIS) events, which is crucial in motor drive applications.
4. Typical Applications
High-Power AC-DC / DC-DC Switch-Mode Power Supplies (PFC boost stage, LLC/Half-Bridge primary switches)
Industrial Motor Drives and Servo Drives
Photovoltaic (PV) Inverters and Energy Storage Systems
Electric Vehicle (EV) Charging Stations
Welding Equipment and Uninterruptible Power Supplies (UPS)
5. Summary
HeroMicro's HM072N15TH is a top-tier power MOSFET designed for high-voltage, high-current, high-efficiency applications. The combination of its ultra-low RDS(ON) and Qg provides an outstanding balance between conduction and switching losses. By providing a robust +10V gate drive, meticulously designing the thermal solution, and strictly adhering to the Safe Operating Area (SOA) limits, engineers can reliably deploy this device in the most demanding power electronics applications.