Part A
AO3401
阿爾法歐米茄電晶體股份有限公司。
- Lifecycle
- Active
- Stock
- 6918 件
- Package
- SOT-23
- Series
- 電晶體-FET、MOSFET-單
Replacement verdict
Not a drop-in replacement
The AO3404A and AO3401 are both SOT-23 N-channel and P-channel MOSFETs respectively, but they differ in channel polarity, voltage rating, and current handling, so the AO3401 cannot directly replace the AO3404A in the same circuit without design changes.
Different channel polarity
Different voltage rating
Different current rating
Different gate drive requirement
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AO3404A | AO3401 | Why it matters |
|---|---|---|---|
| Channel Type | N-Channel | P-Channel | Channel polarity determines how the device is driven and its role in a circuit; N-channel and P-channel MOSFETs are not directly substitutable in most designs. |
| Drain-Source Voltage (Vds) | 30 V | 30 V | Maximum drain-source voltage sets the upper limit of voltage the device can block; both share the same rating here. |
| Continuous Drain Current (Id) | 5.8 A | 4.0 A | Current rating determines the load the MOSFET can carry continuously; the N-channel part handles higher current. |
| RDS(on) at Vgs = 10 V | 28 mΩ | 60 mΩ | On-resistance directly affects conduction losses and efficiency; lower RDS(on) reduces power dissipation and heating. |
| Gate Threshold Voltage (Vgs(th)) | 1.4 V (typ) | -1.4 V (typ) | Threshold voltage indicates the gate drive needed to turn the device on; the sign differs due to channel polarity. |
| Gate-Source Voltage (Vgs max) | ±20 V | ±12 V | Maximum gate-source voltage limits the drive voltage that can be safely applied; the P-channel part has a lower limit. |
| Power Dissipation (Pd) | 1.4 W | 1.4 W | Power dissipation rating defines thermal capability; both share the same package-limited value. |
| Package | SOT-23 | SOT-23 | Package determines footprint and thermal performance; identical packages allow drop-in board compatibility. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AO3401 | AO3404A |
|---|---|---|
| Part Status | Not For New Designs | Not For New Designs |
| FET Type | P-Channel | N-Channel |
| Technology | MOSFET (Metal Oxide) | MOSFET (Metal Oxide) |
| Drain to Source Voltage (Vdss) | 30 V | 30 V |
| Current - Continuous Drain(Id) @ 25°C | 4A (Ta) | 5.8A (Ta) |
| Drive Voltage(Max Rds On Min Rds On) | 2.5V, 10V | 4.5V, 10V |
| Rds On(Max) @ Id Vgs | 50mOhm @ 4A, 10V | 28mOhm @ 5.8A, 10V |
| Vgs(th)(Max) @ Id | 1.3V @ 250µA | 3V @ 250µA |
| Gate Charge(Qg)(Max) @ Vgs | 14 nC @ 10 V | 17 nC @ 10 V |
| Vgs(Max) | ±12V | ±20V |
| Input Capacitance(Ciss)(Max) @ Vds | 645 pF @ 15 V | 820 pF @ 15 V |
| Power Dissipation (Max) | 1.4W (Ta) | 1.4W (Ta) |
| Operating Temperature | -55°C ~ 150°C (TJ) | -55°C ~ 150°C (TJ) |
| Mounting Type | Surface Mount | Surface Mount |
Frequently asked questions
What are the main differences between the AO3404A and AO3401 MOSFETs?
The AO3404A is an N-channel enhancement-mode MOSFET, while the AO3401 is a P-channel enhancement-mode MOSFET. Both are rated for 30 V drain-source voltage (VDS) and are supplied in the SOT-23 package, but they differ in channel polarity, on-resistance, and current ratings, so they are not interchangeable without circuit redesign.
What are the key electrical ratings of the AO3404A?
The AO3404A is a 30 V N-channel MOSFET with a maximum continuous drain current of approximately 5.8 A at 25 °C, a maximum power dissipation of about 1.4 W, and RDS(on) of roughly 28 mΩ at VGS = 10 V and 35 mΩ at VGS = 4.5 V, per the manufacturer datasheet.
What are the key electrical ratings of the AO3401?
The AO3401 is a 30 V P-channel MOSFET with a maximum continuous drain current of approximately 4 A at 25 °C, a maximum power dissipation of about 1.4 W, and RDS(on) of roughly 60 mΩ at VGS = -10 V and 90 mΩ at VGS = -4.5 V, per the manufacturer datasheet.
Can the AO3404A and AO3401 be used as direct substitutes for each other?
No. Because the AO3404A is N-channel and the AO3401 is P-channel, they require opposite gate-drive polarities and different circuit topologies (for example, low-side versus high-side switching). Direct substitution without redesigning the gate drive and circuit configuration is not valid.
Do the AO3404A and AO3401 use the same package and pinout?
Both devices are offered in the SOT-23 (TO-236) surface-mount package with the same three-terminal footprint. However, the internal channel type differs, so the source, drain, and gate connections must be verified against each device's datasheet before any board-level substitution.
Which device is better for low-side switching applications?
The AO3404A, as an N-channel MOSFET, is generally preferred for low-side switching because it offers lower RDS(on) and higher current capability for a given gate drive. The AO3401, being P-channel, is more commonly used in high-side switching or load-switch configurations.
What gate-source voltage (VGS) is required to fully enhance each device?
The AO3404A is specified with RDS(on) at VGS = 4.5 V and 10 V, and the AO3401 is specified at VGS = -4.5 V and -10 V. Both are logic-level compatible, but the AO3401 requires a negative gate-source voltage relative to its source for enhancement.
Are the AO3404A and AO3401 rated for the same maximum drain-source voltage?
Yes. Both devices are rated for a maximum VDS of 30 V, so their voltage-blocking capability is equivalent; the selection between them should be based on channel polarity, RDS(on), current rating, and circuit topology rather than VDS alone.