ELM34405AA MOSFET — Specifications & Equivalents
About the ELM34405AA
The ELM34405AA is a P-channel MOSFET with a drain–source voltage (VDS) rating of 40 V, a continuous drain current (ID) of 5.5 A and an on-resistance (RDS(on)) of 0.055 Ω. It can dissipate up to 2.5 W and is rated to a junction temperature of 150 °C. It is supplied in the SOP-8 package.
At a glance
- Type: P-channel MOSFET
- Max drain–source voltage (VDS): 40 V
- Max continuous drain current (ID): 5.5 A
- On-resistance (RDS(on)): 0.055 Ω
- Power dissipation (PD): 2.5 W
- Max junction temperature (TJ): 150 °C
- Package: SOP-8
Typical applications
With its 40 V drain–source rating the ELM34405AA 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.
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 9.7 ns and an output capacitance (Coss) of 310 pF, which together with the gate drive determines switching loss and the practical upper frequency limit.
Choosing a replacement for the ELM34405AA
A drop-in substitute for the ELM34405AA must be the same P-channel type and offer a drain–source rating of at least 40 V, a continuous drain current rating of at least 5.5 A and an on-resistance no higher than 0.055 Ω if efficiency and heat matter.
Mechanically, check the replacement against the SOP-8 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 ELM34405AA?
The ELM34405AA is a P-channel MOSFET (metal-oxide-semiconductor field-effect transistor). It is rated for 40 V drain-source and 5.5 A continuous drain current.
What is the maximum voltage of the ELM34405AA?
The ELM34405AA has a maximum drain-source voltage (Vds) of 40 V. Treat this as an absolute maximum and design with margin, especially when switching inductive loads.
How much current can the ELM34405AA handle?
It is rated for 5.5 A of continuous drain current, with power dissipation limited to 2.5 W. Real-world capability depends on your heatsinking and ambient temperature.
What is the on-resistance of the ELM34405AA?
On-resistance (Rds(on)) is 0.055 Ω. Multiply by the square of your load current to estimate conduction loss.
What package does the ELM34405AA come in?
It is listed in SOP-8. Verify the pinout of the specific variant, as one outline can carry different pin assignments.
What can I use to replace the ELM34405AA?
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 | P -Channel |
| Drain-Source Voltage (Vds) | 40 V |
| Gate-Source Voltage (Vgs) | 20 V |
| Drain Current (Id) | 5.5 A |
| Drain-Source On-Resistance (Rds) | 0.055 |
| Rise Time (tr) | 9.7 nS |
| Output Capacitance (Coss) | 310 pF |
| Junction Temperature (Tj) | 150 °C |
| Package | SOP-8 |
| Power Dissipation (Pd) | 2.5 W |
Equivalent & Replacement Parts
No verified equivalents are listed for ELM34405AA yet.