Introduction
The IRF840 is one of the most widely used high-voltage N-channel power MOSFETs in switching power supplies, industrial control, and power conversion applications.
With its proven design and stable electrical characteristics, the IRF840 is widely used in:
- Switching Power Supplies (SMPS)
- LED Lighting Drivers
- UPS Systems
- Motor Control
- Industrial Power Equipment
In mass production or component sourcing, engineers and procurement teams may face challenges such as long lead times and cost optimization requirements.
Semiware IRF840 offers a reliable alternative with electrical performance comparable to the Vishay IRF840 and STMicroelectronics IRF840, helping engineers maintain design continuity while improving supply flexibility.
I. Key Features of the IRF840 MOSFET
The IRF840 is a 500V N-channel enhancement-mode MOSFET designed for high-voltage switching applications.
Its key features include:
- 500V drain-source voltage rating
- Low conduction losses
- High switching capability
- High avalanche energy withstand capability
- TO-220 package
II. Semiware IRF840 vs Vishay IRF840 vs ST IRF840 Comparison
| Parameter | Semiware IRF840 | Vishay IRF840 | ST IRF840 |
| Drain-Source Voltage (VDS) | 500V | 500V | 500V |
| Continuous Drain Current (ID) | 8.5A | 8A | 8A |
| RDS(on) Max | 0.85Ω | 0.85Ω | 0.85Ω |
| Gate-Source Voltage (VGS) | ±30V | ±20V | ±20V |
| Power Dissipation (PD) | 147W | 125W | 125W |
III. Why can Semiware IRF840 be an alternative?
- Performance Compatibility
For applications initially designed with IRF840, the following key parameters are crucial:
- Drain-source voltage
- On-resistance
- Current capability
- Gate voltage rating
As the comparison above shows, Semiware IRF840 maintains similar electrical characteristics, making it a viable alternative to major brand IRF840s.
- Improved Supply Chain Flexibility
Many industrial products have long lifecycles, making a stable supply of components crucial.
- Using qualified second suppliers helps manufacturers:
- Reduce dependence on a single supplier
- Increase procurement flexibility
- Reduce the risk of supply fluctuations
Semiware provides customers with alternative MOSFET solutions that meet long-term production needs.
IRF840 Datasheet
Conclusion
Vishay IRF840 and ST IRF840 are widely used in high-voltage switching applications, and the Semiware IRF840 has comparable electrical characteristics. For engineers looking for alternatives, the Semiware IRF840 provides a practical option for power and industrial applications.
For IRF840 samples, and other MOSFET solutions to meet your application needs, please contact Semiware.
