IRFZ34A MOSFET — Specifications & Equivalents
Manufacturer: Commonly produced by International Rectifier (now Infineon)
About the IRFZ34A
The IRFZ34A is an N-channel MOSFET with a drain–source voltage (VDS) rating of 60 V, a continuous drain current (ID) of 30 A and an on-resistance (RDS(on)) of 0.04 Ω. It can dissipate up to 77 W and is rated to a junction temperature of 175 °C. It is supplied in the TO220 package.
At a glance
- Type: N-channel MOSFET
- Max drain–source voltage (VDS): 60 V
- Max continuous drain current (ID): 30 A
- On-resistance (RDS(on)): 0.04 Ω
- Power dissipation (PD): 77 W
- Max junction temperature (TJ): 175 °C
- Package: TO220
- Manufacturer: Commonly produced by International Rectifier (now Infineon)
Typical applications
With its 60 V drain–source rating the IRFZ34A sits in the mid-range class of switching MOSFETs, typically found in 24 V and 48 V industrial and battery systems, motor drives and H-bridges and load and hot-swap switching.
The low 0.04 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 ±20 V maximum; exceeding it punctures the gate oxide and destroys the device permanently.
Switching behaviour is characterised by a rise time of 16 ns and an output capacitance (Coss) of 355 pF, which together with the gate drive determines switching loss and the practical upper frequency limit.
Choosing a replacement for the IRFZ34A
A drop-in substitute for the IRFZ34A must be the same N-channel type and offer a drain–source rating of at least 60 V, a continuous drain current rating of at least 30 A and an on-resistance no higher than 0.04 Ω if efficiency and heat matter.
Mechanically, check the replacement against the TO220 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 IRFZ34A?
The IRFZ34A is an N-channel MOSFET (metal-oxide-semiconductor field-effect transistor). It is rated for 60 V drain-source and 30 A continuous drain current.
What is the maximum voltage of the IRFZ34A?
The IRFZ34A has a maximum drain-source voltage (Vds) of 60 V. Treat this as an absolute maximum and design with margin, especially when switching inductive loads.
How much current can the IRFZ34A handle?
It is rated for 30 A of continuous drain current, with power dissipation limited to 77 W. Real-world capability depends on your heatsinking and ambient temperature.
What is the on-resistance of the IRFZ34A?
On-resistance (Rds(on)) is 0.04 Ω. Multiply by the square of your load current to estimate conduction loss.
What package does the IRFZ34A come in?
It is listed in TO220. Verify the pinout of the specific variant, as one outline can carry different pin assignments.
What can I use to replace the IRFZ34A?
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) | 60 V |
| Gate-Source Voltage (Vgs) | 20 V |
| Drain Current (Id) | 30 A |
| Drain-Source On-Resistance (Rds) | 0.04 |
| Rise Time (tr) | 16 nS |
| Output Capacitance (Coss) | 355 pF |
| Junction Temperature (Tj) | 175 °C |
| Package | TO220 |
| Power Dissipation (Pd) | 77 W |
Equivalent & Replacement Parts
No verified equivalents are listed for IRFZ34A yet.