The HM5N50D is HeroMicro a high-voltage N-channel power MOSFET built using advanced trench technology, designed for low-to-medium-power applications such as switch-mode power supplies (SMPS), LED drivers, adapters, and industrial controls. Key strengths include 500V blocking voltage, low gate charge, good thermal performance, and a compact surface-mount TO-252 package—making it ideal for cost-sensitive, reliable designs.
1. Key Specifications (from HM5N50D.pdf)
Drain-Source Voltage (VDS): 500 V
Continuous Drain Current (ID): 5 A (TC=25°C), 2.6 A (TC=100°C)
Pulsed Drain Current (IDM): 20 A
On-Resistance (RDS(ON)):
Typ. 1415 mΩ (Max 1500 mΩ) @ VGS=10V, ID=4A
Gate Threshold Voltage (VGS(th)): 2–4 V (@ ID=250 μA)
Total Gate Charge (Qg): 12 nC (@ VGS=10V, VDS=400V, ID=5A)
Input Capacitance (Ciss): 414 pF (@ VDS=25V, f=1MHz)
Switching Characteristics (VDS=250V, ID=5A, RG=25Ω):
td(on): 6 ns, tr: 21 ns
td(off): 14 ns, tf: 22 ns
Body Diode:
VSD ≤ 1.2 V @ ISD=5A
trr: 289 ns
Single-Pulse Avalanche Energy (EAS): 167 mJ
Package: TO-252 (DPAK, surface-mount with thermal pad)
Power Dissipation (PD): 24.5 W (TC=25°C)
Thermal Resistance: RθJC = 4.2 °C/W; RθJA = 48.2 °C/W
Operating Junction Temperature: –55°C to +150°C
Environmental: Green (lead-free) option available
2. Key Usage Guidelines
(1) Gate Drive & Switching
Drive with VGS = 10 V for optimal conduction.
Low Qg (12 nC) enables efficient operation up to ~100 kHz.
Tested with RG = 25 Ω—reduce RG slightly for faster switching, but monitor EMI.
(2) Thermal Management
Solder the exposed thermal pad to a copper area (≥2 cm²) with multiple thermal vias.
Derate current at high case temperatures per Fig. 10.
Use RθJC (4.2 °C/W) for accurate junction temperature estimation.
(3) Body Diode Limitations
Long trr (289 ns) can cause voltage overshoot in hard-switching topologies (e.g., flyback).
Add an RC snubber or TVS clamp on the drain for protection.
(4) Avalanche Robustness
Rated for 167 mJ single-pulse avalanche energy—suitable for small inductive loads.
Avoid repetitive avalanche operation for long-term reliability.
(5) Safe Operating Area (SOA)
Refer to SOA curve (Fig. 9); avoid sustained operation above 400 V and 2 A simultaneously.
Pulsed mode (≤300 μs, ≤2% duty) allows full 20 A IDM.
3. Typical Applications
Low-power AC-DC SMPS (5–30 W flyback converters)
LED driver primary switches
Standby power supplies in consumer electronics
Auxiliary power in industrial control boards
Battery chargers
4. Summary
The HM5N50D offers a cost-effective, reliable solution for 500V, low-current switching applications. With proper thermal layout, gate drive design, and SOA compliance, it delivers excellent performance in compact, high-volume power supplies for consumer and industrial markets.
