Per the Ftd02p datasheet's "Mounting Instructions" section:
When driving inductive loads (relays, solenoids, small motors), the Ftd02p can serve as a flyback diode. Its fast response clamps the inductive kickback below the breakdown voltage.
The P-channel FTD02P sits on the high side of the bridge, connected directly to the positive high-voltage rail. Ftd02p Datasheet
The FTD02P is a versatile power MOSFET that can be used in a wide range of applications, including:
Circuit: Connect the Ftd02p in across the relay coil (cathode to positive supply, anode to ground). The 30A surge rating handles the initial high-current spike without failure, protecting the driving transistor. The FTD02P is a versatile power MOSFET that
Reading the FTD02P datasheet can be overwhelming, especially for those who are new to power MOSFETs. Here are some tips on how to read the datasheet:
| Parameter | Ftd02p | 1N4002 (Standard) | 1N5819 (Schottky) | UF4002 (Ultrafast) | | :--- | :--- | :--- | :--- | :--- | | | 2.0A | 1.0A | 1.0A | 1.0A | | Reverse Voltage | 200V | 100V | 40V | 100V | | Recovery Time | 50ns | 30µs | <1ns (no recovery) | 50ns | | Forward Voltage @ 1A | 0.85V | 1.1V | 0.45V | 1.0V | | Best For | 2A, 200V SMPS | 50/60Hz line | Low voltage, high efficiency | 1A ultrafast switching | Here are some tips on how to read
Features robust thermal stability and, usually, overcurrent/thermal shutdown protection.
The FTD02P is a common failure part, which has led to a market for counterfeit or substandard clones. When sourcing replacements, especially from marketplace sites, be vigilant. Counterfeit components may have incorrect pinouts, lower current ratings, or may fail almost immediately.
If you’re using the FTD02P, bookmark page 4. And never, ever assume “typical” means “safe.”