I. Product Overview
The SNM3400 is a 30V N-channel small-signal MOSFET housed in a compact SOT-23-3L surface-mount package. It features low on-resistance, fast switching speeds, and high current-carrying capability.
Designed to be highly compatible with the widely used AO3400 MOSFET—in terms of package type, voltage rating, current capability, and application scenarios—the SNM3400 serves as a suitable replacement for the AO3400 in various low-voltage switching applications.
II. Parameter Comparison: SNM3400 vs. AO3400
| Parameter | SNM3400 | AO3400 |
| MOSFET Type | N-Channel | N-Channel |
| Package | SOT-23-3L | SOT-23-3L |
| ESD Protection | No | No |
| Drain-Source Voltage (VDS) | 30V | 30V |
| Gate-Source Voltage (VGS) | ±12V | ±12V |
| Continuous Drain Current (ID) | 5.8A | 5.8A |
| Power Dissipation (PD) | 1.4W | 1.4W |
| RDS(ON) @ VGS=10V | Typ. 29mΩ / Max. 32mΩ | Typ. 18mΩ / Max. 28mΩ |
| RDS(ON) @ VGS=4.5V | Typ. 32mΩ / Max. 36mΩ | Typ. 19mΩ / Max. 33mΩ |
III. Why Can the SNM3400 Replace the AO3400?
As shown in the parameter comparison table above, the SNM3400 and AO3400 share the following characteristics:
- Identical package and pin configuration
Both the SNM3400 and AO3400 utilize the widely adopted SOT-23-3L package, allowing for direct PCB replacement without the need to modify the circuit board layout.
- Comparable electrical performance
- Low on-resistance (RDS(ON)) for reduced power consumption
IV. Typical Applications for the SNM3400
Battery-powered devices:
- Portable electronic devices
- Battery management systems
- Power control modules
Consumer electronics:
- Mobile phones
- TWS Bluetooth earbuds
- Smart lighting
- Laptops
Industrial and communication equipment:
- Network communication equipment
- Security and surveillance equipment
- Industrial power supplies
Switching control applications:
- Relay drivers
- Solenoid valve drivers
- LED drivers
- Solid-state relays
- TTL/CMOS logic interfaces
SNM3400 Datasheet
Conclusion: SNM3400 is a Reliable Replacement for AO3400
The SNM3400 is a reliable choice for applications requiring a replacement for the AO3400.
Please contact Semiware for samples or technical support.
