IRF840
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IRF840
278-IRF840
Explore the IRF840 N-Channel Power MOSFET from STMicroelectronics. Where to buy. Distributed by Onzuu.
IRF840 Description
IRF840 N-Channel MOSFET Overview
The IRF840 is an N-Channel power MOSFET from STMicroelectronics, designed using advanced PowerMESH™ II technology. With a high voltage tolerance of 500V and current handling up to 8A, it is ideal for switching applications in power supplies, lighting systems, and industrial drives. Although now classified as Obsolete, the IRF840 remains a reference component for high-efficiency power control.
IRF840 Datasheet PDF
Click below to download the original datasheet for the IRF840 MOSFET:
Download IRF840 Datasheet (PDF)
Key Features
- Advanced PowerMESH™ II technology
- High voltage capability: 500V
- Drain current up to 8A at 25°C
- Low RDS(on): 850 mOhm
- Fast switching with 39 nC gate charge
- ±20V gate-source voltage tolerance
IRF840 Specifications
| Parameter | Value |
|---|---|
| Manufacturer | STMicroelectronics |
| Series | PowerMESH™ II |
| Status | Obsolete |
| FET Type | N-Channel |
| Technology | MOSFET (Metal Oxide) |
| VDSS | 500 V |
| ID (Continuous @ 25°C) | 8 A (Tc) |
| Drive Voltage | 10 V |
| RDS(on) @ Id, Vgs | 850 mOhm @ 3.5A, 10V |
| VGS(th) @ Id | 4 V @ 250µA |
| Gate Charge (Qg) | 39 nC @ 10 V |
| Input Capacitance (Ciss) | 832 pF @ 25 V |
| Power Dissipation | 125W (Tc) |
| Package / Case | TO-220-3 |
| Mounting Type | Through Hole |
Applications
- Switch Mode Power Supplies (SMPS)
- AC-DC Converters
- DC Motor Drives
- High-efficiency lighting systems
- Industrial control systems
🛒 Buy IRF840 or Find Alternatives
Looking for IRF840 or equivalent parts? Contact Onzuu, your trusted electronic component distributor. We offer sourcing, BOM services, and global delivery.
Why Choose Onzuu?
Onzuu is a trusted B2B distributor of electronic components. We offer authentic sourcing, competitive pricing, and global shipping. If IRF840 is obsolete or unavailable, our team can recommend direct replacements or equivalents from brands like Vishay, STMicroelectronics, or ON Semiconductor.
IRF840 Frequently Asked Questions (FAQ)
What is the voltage and current rating of IRF840?
IRF840 supports up to 500V drain-source voltage and 8A continuous drain current at 25°C.
Is IRF840 still in production?
No, the IRF840 is officially listed as Obsolete, but legacy stock may still be found from authorized distributors.
What is a good replacement for IRF840?
Good replacements may include IRF840N, STP10NK60Z, or other 500V N-channel MOSFETs with similar Rds(on) and current ratings.
Conclusion
The IRF840 remains a valuable reference component in power electronics design, known for its high voltage rating and reliability. While obsolete, it is still sought after for repair and replacement in older equipment. Onzuu continues to support engineers and buyers with sourcing solutions for legacy components like the IRF840.
Technical specifications
| FET Type | N-Channel | |
| Input Capacitance (Ciss) (Max) @ Vds | 832 pF @ 25 V | |
| Gate Charge (Qg) (Max) @ Vgs | 39 nC @ 10 V | |
| Product Status | Obsolete | |
| Supplier Device Package | TO-220 | |
| Drain to Source Voltage (Vdss) | 500 V | |
| Power Dissipation (Max) | 125W (Tc) | |
| Package / Case | TO-220-3 | |
| Technology | MOSFET (Metal Oxide) | |
| REACH Status | REACH Unaffected | |
| Mfr | STMicroelectronics | |
| Vgs (Max) | ±20V | |
| RoHS Status | RoHS non-compliant | |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) | |
| Operating Temperature | 150°C (TJ) | |
| FET Feature | - | |
| ECCN | EAR99 | |
| Mounting Type | Through Hole | |
| Rds On (Max) @ Id, Vgs | 850mOhm @ 3.5A, 10V | |
| Vgs(th) (Max) @ Id | 4V @ 250µA | |
| Series | PowerMESH™ II | |
| Current - Continuous Drain (Id) @ 25°C | 8A (Tc) | |
| Drive Voltage (Max Rds On, Min Rds On) | 10V | |
| HTSUS | 8541.29.0095 | |
| Package | Tube | |
| Base Product Number | IRF8 |
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