U105D MOSFET — Specifications & Equivalents
About the U105D
The U105D is a P-channel MOSFET with a drain–source voltage (VDS) rating of 31 V, a continuous drain current (ID) of 0.025 A and an on-resistance (RDS(on)) of 150 Ω. It can dissipate up to 0.4 W.
At a glance
- Type: P-channel MOSFET
- Max drain–source voltage (VDS): 31 V
- Max continuous drain current (ID): 0.025 A
- On-resistance (RDS(on)): 150 Ω
- Power dissipation (PD): 0.4 W
Typical applications
With its 31 V drain–source rating the U105D 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.
At 0.025 A it is aimed at small-signal and light-load switching rather than power conversion.
On-resistance of 150 Ω is relatively high, so this part is better suited to low duty-cycle or low-current switching than to continuous high-current conduction.
Gate drive and switching notes
Keep gate–source voltage within the ±31 V maximum; exceeding it punctures the gate oxide and destroys the device permanently.
Choosing a replacement for the U105D
A drop-in substitute for the U105D must be the same P-channel type and offer a drain–source rating of at least 31 V, a continuous drain current rating of at least 0.025 A and an on-resistance no higher than 150 Ω if efficiency and heat matter.
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 U105D?
The U105D is a P-channel MOSFET (metal-oxide-semiconductor field-effect transistor). It is rated for 31 V drain-source and 0.025 A continuous drain current.
What is the maximum voltage of the U105D?
The U105D has a maximum drain-source voltage (Vds) of 31 V. Treat this as an absolute maximum and design with margin, especially when switching inductive loads.
How much current can the U105D handle?
It is rated for 0.025 A of continuous drain current, with power dissipation limited to 0.4 W. Real-world capability depends on your heatsinking and ambient temperature.
What is the on-resistance of the U105D?
On-resistance (Rds(on)) is 150 Ω. Multiply by the square of your load current to estimate conduction loss.
What can I use to replace the U105D?
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) | 31 V |
| Gate-Source Voltage (Vgs) | 31 V |
| Drain Current (Id) | 0.025 A |
| Drain-Source On-Resistance (Rds) | 150 |
| Power Dissipation (Pd) | 0.4 W |
Equivalent & Replacement Parts
No verified equivalents are listed for U105D yet.