Voltage parameters (V): ensure safety redundancy of the drive system
 
The MOT4674S N-channel at 40V and P-channel at -40V, both significantly higher than the mainstream drive voltages (12V/24V) for fan lights. During fan light motor start-up, speed switching, or voltage fluctuations, induced voltage spikes will occur in the motor peak. The 40V withstand voltage provides ample safety redundancy of 16V~28V, effectively preventing voltage spikes from damaging the MOSFETs and ensuring the stability of the three-phase bridge drive circuit under dynamic conditions. Simultaneously, the ±20V gate-source voltage parameter allows direct compatibility with commonly used 5V/10V gate drive circuits for fan lights, eliminating the need for additional gate clamping components, simplifying driver board design and reducing costs.



Current parameter (I): Matching fan power output and impact load requirements
 
The continuous drain current I = 7A for the N-channel and -5A for the P-channel. The pulsed drain current I (28A for the N-channel and -20A for the P-channel) far exceeds the typical operating current (0.8A~3A) and peak starting current (6A) of a fan-type light motor. The 7A continuous current margin ensures stable long-term operation at high speeds (such as in powerful ventilation mode) without speed reduction or insufficient thrust due to MOSFET current limitation. The 28A pulsed current capability easily handles the inrush current during motor startup, to prevent the failure of start-up, shaking, or damage of overheating.
 
On-resistance (R): Reduces conduction losses and improves system efficiency.
 
The MOT4674S N-channel has a typical RDS(on) of only 24mΩat Vgs=10V and ID=5A, and 32mΩ at Vgs=4.5V and ID=5A. While the P-channel has a typical RDS(on) value of 54mΩ at Vgs=-10V and ID=-5A. As long-term household appliances, the energy efficiency of fan lights directly affects user operating costs (mains power consumption) or battery life (for rechargeable fan lights). Low conduction losses can reduce the conversion of electrical energy into heat, thus to improve energy efficiency and reduce driver board temperature rising, thereby to reduce the design requirements for the cooling system.
 
Switching Characteristics (t, t, Q): Adaptable to PWM speed controlling, and to improve control precision and quietness.
 
The MOT4674S N-channel turn-on delay T= 4.5ns, turn-off delay T = 14.5ns, rising time T = 2.5ns, fall time T = 3.5ns. The total gate charge Qg = 8.9nC (N-channel), 17nC (P-channel). The fan light needs to support multi-speed control (e.g., 3-6 speeds), with mainstream PWM speed control frequencies of 20kHz-25kHz to avoid audible noise. Short switching delay ensures precise motor commutation timing, to avoid torque fluctuations and operating noise caused by commutation lag. The low gate charge reduces losses in the gate drive circuit while improving switching response speed and resulting in smoother fan light speed switching (no sudden speed changes), higher PWM speed control resolution, and more stable low-speed operation (no shaking).
 
In summary,
 
from an FAE (Field Application Engineer) perspective, the core parameters of the MOT4674S (high withstand voltage, ample current redundancy, low loss, fast switching, and small package) are highly compatible with the requirements of BLDC drive systems for fan lights. Its core advantages lie in "high reliability redundancy + low loss efficiency + high integration compatibility" to directly improve the four core indicators of fan lights: ventilation performance, energy efficiency, noise reduction, and stability. Simultaneously, it simplify drive solution design and reduce R&D and after-sales costs, and ensure products pass appliance compliance certifications. Furthermore, the device's low EMI and environmentally friendly characteristics further align with the modern home appliance development trend of "high efficiency, quiet operation, and environmental protection," so as to be the preferred MOSFET device for fan light drive systems.