The HM03NG is HeroMicro a high-voltage N-channel power MOSFET fabricated using advanced high-cell-density trench technology, designed for low-power applications such as switch-mode power supplies (SMPS), LED drivers, home appliance control boards, and industrial auxiliary power modules. With 500V blocking voltage, moderate on-resistance (RDS(ON) < 3000 mΩ @ VGS=10V), low gate charge, and robust avalanche capability, it offers a cost-effective solution for reliability-focused, low-to-mid power designs.
1. Key Specifications (from HM03NG.pdf)
Drain-Source Voltage (VDS): 500 V
Continuous Drain Current (ID): 3 A (TC=25°C)
Pulsed Drain Current (IDM): 12 A
On-Resistance (RDS(ON)):
Typ. 2450 mΩ (Max 3000 mΩ) @ VGS=10V, ID=40A* (*characterization condition; continuous ID = 3A)
Gate Threshold Voltage (VGS(th)): 2–4 V (@ ID=250 μA)
Total Gate Charge (Qg): 9–12 nC (@ VGS=10V, VDS=400V, ID=3A)
Input Capacitance (Ciss): 279–364 pF (@ VDS=25V, f=1MHz)
Switching Characteristics (VDS=250V, ID=3A, RG=25Ω):
td(on): 9–29 ns, tr: 24–59 ns
td(off): 34–79 ns, tf: 24–59 ns
Body Diode:
VSD ≤ 1.4 V @ ISD=3A
trr: 179 ns
Single-Pulse Avalanche Energy (EAS): 200 mJ
Package: TO-252 (DPAK, surface-mount with thermal pad)
Power Dissipation (PD): 50 W (TC=25°C)
Thermal Resistance: RθJC = 2.5 °C/W; RθJA = 110 °C/W
Operating Junction Temperature: –55°C to +150°C
Environmental: Green (lead-free) option available
2. Key Usage Guidelines
(1) Drive Voltage & Application Scope
Drive with VGS = 10 V for full enhancement.
Relatively high RDS(ON) (~2.45 Ω) limits use to low-power (<15 W) applications like standby supplies or small LED drivers—not suited for high-efficiency or high-current designs.
(2) Thermal Management
At 3 A, conduction loss ≈ 22 W—close to practical limits despite 50 W rating.
Solder the exposed thermal pad to a large copper area (≥2 cm²) with thermal vias.
In natural convection, derate continuous current to 1.5–2 A for reliability.
(3) Body Diode & Snubber Recommendation
Moderate trr (179 ns) can cause voltage overshoot in flyback converters.
Add an RC snubber or TVS clamp on the drain when switching inductive loads.
(4) Excellent Avalanche Robustness
High EAS (200 mJ) ensures strong tolerance to inductive turn-off stress—ideal for driving relays, solenoids, or small motors.
(5) Safe Operating Area (SOA)
Avoid sustained operation near 500 V and 3 A simultaneously.
Pulsed mode (≤300 μs, ≤2% duty) allows full 12 A IDM.
3. Typical Applications
Low-power AC-DC SMPS (5–15 W flyback converters)
Basic LED lighting drivers
Appliance standby power (microwaves, washing machines)
Industrial I/O relay drivers
Low-cost wall adapters
4. Summary
The HM03NG delivers exceptional value for low-power, high-voltage switching with its 500V rating, industry-leading 200 mJ avalanche energy, and thermally capable TO-252 package. With proper thermal design, gate drive, and drain-side protection, it provides a reliable, economical solution for consumer electronics and industrial control systems where long-term stability matters more than peak efficiency.
