AS2309 MOSFET — Specifications & Equivalents
About the AS2309
The AS2309 is a MOSFET with a drain–source voltage (VDS) rating of 60 V and a continuous drain current (ID) of 1.7 A. It can dissipate up to 1 W and is rated to a junction temperature of 150 °C. It is supplied in the SOT-23 package.
At a glance
- Type: MOSFET
- Max drain–source voltage (VDS): 60 V
- Max continuous drain current (ID): 1.7 A
- Power dissipation (PD): 1 W
- Max junction temperature (TJ): 150 °C
- Package: SOT-23
Typical applications
With its 60 V drain–source rating the AS2309 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.
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 an output capacitance (Coss) of 59 pF, which together with the gate drive determines switching loss and the practical upper frequency limit.
Choosing a replacement for the AS2309
A drop-in substitute for the AS2309 should match its polarity and offer a drain–source rating of at least 60 V and a continuous drain current rating of at least 1.7 A.
Mechanically, check the replacement against the SOT-23 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 AS2309?
The AS2309 is a MOSFET (metal-oxide-semiconductor field-effect transistor). It is rated for 60 V drain-source and 1.7 A continuous drain current.
What is the maximum voltage of the AS2309?
The AS2309 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 AS2309 handle?
It is rated for 1.7 A of continuous drain current, with power dissipation limited to 1 W. Real-world capability depends on your heatsinking and ambient temperature.
What package does the AS2309 come in?
It is listed in SOT-23. Verify the pinout of the specific variant, as one outline can carry different pin assignments.
What can I use to replace the AS2309?
This page lists 17 candidate equivalents matched on electrical ratings and package. Any replacement should meet or exceed the original voltage, current and dissipation figures and use a compatible drive level.
Key Specifications
| Pd ⓘ - Maximum Power Dissipation | 1 W |
|---|---|
| |Vds|ⓘ - Maximum Drain-Source Voltage | 60 V |
| |Vgs|ⓘ - Maximum Gate-Source Voltage | 20 V |
| |Id| ⓘ - Maximum Drain Current | 1.7 A |
| Tj ⓘ - Maximum Junction Temperature | 150 °C |
| Cossⓘ - Output Capacitance | 59 pF |
| Package | SOT-23 |
| AS2306 N-Channel MOSFET SOT-23 Plastic-Encapsulate MOSFETSSOT-23 FEATURE TrenchFET Power MOSFET 1. GATE APPLICATIONS 2. SOURCE 3. DRAIN Load Switch for Portable Devices DC/DC Converter MARKING | A6 Maximum ratings (Ta=25 unless otherwise noted) Characteristic Symbol Max Unit Drain-Source VoltageBV 20 VDSS- |
| AS2302 N-Channel 20V(D-S) MOSFET SOT-23 Plastic-Encapsulate MOSFETSSOT-23 FEATURE TrenchFET Power MOSFET 1. GATE APPLICATIONS 2. SOURCE 3. DRAIN Load Switch for Portable Devices DC/DC Converter MARKING | A2 Maximum ratings (Ta=25 unless otherwise noted) Characteristic Symbol Max Unit Drain-Source VoltageBVDSS 20 V- |