IRF6603 MOSFET — Specifications & Equivalents
Manufacturer: Commonly produced by International Rectifier (now Infineon)
About the IRF6603
The IRF6603 is an N-channel MOSFET with a drain–source voltage (VDS) rating of 30 V, a continuous drain current (ID) of 28 A and an on-resistance (RDS(on)) of 0.0039 Ω. It can dissipate up to 5 W and is rated to a junction temperature of 150 °C. It is supplied in the DIRECTFET package.
At a glance
- Type: N-channel MOSFET
- Max drain–source voltage (VDS): 30 V
- Max continuous drain current (ID): 28 A
- On-resistance (RDS(on)): 0.0039 Ω
- Power dissipation (PD): 5 W
- Max junction temperature (TJ): 150 °C
- Package: DIRECTFET
- Manufacturer: Commonly produced by International Rectifier (now Infineon)
Typical applications
With its 30 V drain–source rating the IRF6603 sits in the low-voltage class of switching MOSFETs, typically found in 12 V and 24 V automotive and industrial rails, synchronous buck converters, load switching and reverse-polarity protection and H-bridges for small motors.
The low 0.0039 Ω on-resistance keeps conduction loss down, which suits synchronous rectification and continuous high-current paths.
Gate drive and switching notes
Keep gate–source voltage within the ±12 V maximum; exceeding it punctures the gate oxide and destroys the device permanently.
Choosing a replacement for the IRF6603
A drop-in substitute for the IRF6603 must be the same N-channel type and offer a drain–source rating of at least 30 V, a continuous drain current rating of at least 28 A and an on-resistance no higher than 0.0039 Ω if efficiency and heat matter.
Mechanically, check the replacement against the DIRECTFET footprint and confirm the pin order — parts sharing a package outline do not always share a pinout.
Where the application switches inductive loads or runs near the voltage limit, keep extra headroom rather than choosing a part that only just meets the original numbers.
Frequently asked questions
What is the IRF6603?
The IRF6603 is an N-channel MOSFET (metal-oxide-semiconductor field-effect transistor). It is rated for 30 V drain-source and 28 A continuous drain current.
What is the maximum voltage of the IRF6603?
The IRF6603 has a maximum drain-source voltage (Vds) of 30 V. Treat this as an absolute maximum and design with margin, especially when switching inductive loads.
How much current can the IRF6603 handle?
It is rated for 28 A of continuous drain current, with power dissipation limited to 5 W. Real-world capability depends on your heatsinking and ambient temperature.
What is the on-resistance of the IRF6603?
On-resistance (Rds(on)) is 0.0039 Ω. Multiply by the square of your load current to estimate conduction loss.
What package does the IRF6603 come in?
It is listed in DIRECTFET. Verify the pinout of the specific variant, as one outline can carry different pin assignments.
What can I use to replace the IRF6603?
No verified equivalents are listed yet. Choose a part of the same polarity that meets or exceeds every rating above and shares a compatible package and pinout.
Key Specifications
| Type | MOSFET |
|---|---|
| Channel Type | N -Channel |
| Drain-Source Voltage (Vds) | 30 V |
| Gate-Source Voltage (Vgs) | 12 V |
| Drain Current (Id) | 28 A |
| Drain-Source On-Resistance (Rds) | 0.0039 |
| Junction Temperature (Tj) | 150 °C |
| Package | DIRECTFET |
| Power Dissipation (Pd) | 5 W |
Equivalent & Replacement Parts
No verified equivalents are listed for IRF6603 yet.