The HM021N10TL, introduced by HeroMicro, is an ultra-high-performance 100V, 120A N-channel power MOSFET. It leverages advanced SGT (Split-Gate Trench) technology to achieve an industry-leading combination of ultra-low on-resistance (RDS(ON)) and low gate charge (Qg). This device is specifically engineered for high-efficiency, high-current switching applications and is an ideal choice for synchronous rectification, DC-DC converters, motor drives, and battery protection.
1. Key Features Overview
Based on the datasheet provided by HeroMicro (HM021N10TL.pdf), key specifications are:
Ultra-High Current Capability:
Drain-Source Voltage (VDS): 100V
Continuous Drain Current (ID): 120A (TC=25°C), 84A (TC=100°C)
Pulsed Drain Current (IDM): Up to 480A
Industry-Leading Ultra-Low Conduction Losses:
Ultra-Low On-Resistance (RDS(ON)): Typical value of only 2.1mΩ, Max 2.7mΩ (@ VGS=10V, ID=20A). This is its standout feature.
Excellent Switching Performance:
Low Gate Charge (Qg): Typical 130nC (@ VDS=50V, ID=20A), helping to reduce drive losses.
Fast Switching Speed: Typical turn-on time (td(on)+tr) is 69ns, and turn-off time (td(off)+tf) is 179ns.
High Reliability & Thermal Performance:
Wide Operating Junction Temperature Range: -55°C to +150°C.
Very High Power Dissipation: 329W (TC=25°C).
Extremely Low Thermal Resistance: Junction-to-Case (RθJC) is only 0.29°C/W, ensuring highly efficient heat transfer to the PCB or heatsink.
Package: TOLL (TO-Leadless), a leadless, large-pad surface-mount package offering superior electrical and thermal performance, ideal for automated manufacturing and high-power-density designs.
2. Pin Configuration
The HM021N10TL uses a TOLL (TO-Leadless) package with 9 pins, featuring a unique internal connection:
| Pin | Symbol | Function |
|---|---|---|
| 1 | G | Gate |
| 2-8 | S | Source - 7 pins paralleled |
| 9 | D | Drain - Large exposed pad on bottom |
Critical Notes:
The Source (S) is formed by 7 peripheral pins (Pin 2-8) connected in parallel to carry high current and minimize parasitic inductance.
The Drain (D) is a large exposed copper pad on the bottom center of the package. In PCB design, a sufficiently large copper area must be allocated for this pad, connected to inner-layer power/ground planes via multiple vias for optimal electrical connection and thermal management.
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. Its threshold voltage (VGS(th)) ranges from 2V to 4V.
Drive Current Capability: Although its Qg is 130nC, due to its extremely low RDS(ON), it is typically used in very high current applications, so the driver circuit still needs to deliver sufficient peak current for fast switching. The datasheet test condition uses a 6Ω gate resistor (RG).
Preventing False Turn-On: In high dv/dt environments, the Miller capacitance (Crss) can cause false turn-on. It is recommended to place a small resistor (e.g., 10kΩ) between gate and source or use a driver with Miller clamp functionality.
(2) Body Diode Characteristics
An internal body diode is integrated from Source (S) to Drain (D).
Forward Voltage (VSD): Max 1.0V (@ ISD=1A). This is a relatively fast body diode, performing well in synchronous rectification applications.
(3) PCB Layout & Thermal Management (Critical!)
Drain Pad Handling: This is key to unlocking its 329W dissipation capability. The PCB must have a large copper pour for the bottom drain pad, connected to inner-layer power/ground planes with numerous thermal vias. This serves as both the primary electrical connection and the main heat dissipation path.
Source Routing: The traces for all 7 source pins (Pin 2-8) should be paralleled and merged to form a low-impedance, low-inductance source connection. This is crucial for high-current operation and accurate current sensing (if used).
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 during switching.
(4) Safe Operating Area (SOA) & Avalanche Capability
The datasheet specifies a Single Pulse Avalanche Energy (EAS) of 1536mJ. This represents the device's ability to withstand Unclamped Inductive Switching (UIS) events, which is critical in motor drive applications.
Although an SOA curve is not directly provided, designers must still ensure that during startup, overload, and other transient conditions, the device's operating point does not enter the dangerous linear region to avoid thermal runaway.
(5) Absolute Maximum Ratings
Gate-Source Voltage (VGS): ±20V. Exceeding this can cause permanent gate oxide breakdown.
4. Typical Applications
Synchronous Rectification (SR) in server and telecom power supplies
High Power Density DC-DC Converters (e.g., POL, VRM)
Motor drives and Battery Management Systems (BMS) for power tools, drones, and electric vehicles
Solar inverters and industrial power supplies
5. Summary
HeroMicro's HM021N10TL sets a new benchmark for 100V power MOSFETs with its 2.1mΩ ultra-low RDS(ON) and the exceptional thermal performance offered by the TOLL package. It is the go-to choice for design engineers pursuing ultimate efficiency and power density. By providing a robust +10V gate drive, meticulously designing the PCB layout to maximize the use of its bottom thermal pad, and paying attention to false turn-on prevention, you can fully unleash the potential of this top-tier MOSFET.
