The FM4748W is a Zener diode manufactured by Rectron Semiconductor. Zener diodes are semiconductor devices that allow current to flow in either a forward or reverse direction, but when the voltage reaches the Zener voltage, the diode will break down and allow current to flow in the reverse direction to maintain the voltage at the Zener voltage. This characteristic makes them useful in voltage regulation and protection circuits.

Applications

• Voltage regulation
• Voltage clamping
• Surge protection
• Overvoltage protection in sensitive electronic equipment
• Reference voltage in power supplies

Features

• High surge current capability
• Low reverse leakage current
• Glass passivated junction
• Zener voltage tolerance of ±5%
• Available in various voltage ratings
• RoHS compliant

Benefits

• Provides stable voltage regulation
• Protects circuits from overvoltage conditions
• Offers a precise reference voltage
• High reliability
• Long operational life

Technical Specifications

The FM4748W has a Zener voltage (Vz) of approximately 18V. The power dissipation is typically around 1W, but this varies depending on the exact specifications. It is commonly available in a DO-214AC (SMA) package, which is designed for surface mounting. The operating temperature range is typically from -65°C to +150°C.

The forward voltage (Vf) is typically around 1.2V at a forward current of 200mA. Reverse leakage current is typically very low, in the order of microamps. The surge current capability is a significant parameter for Zener diodes, and the FM4748W is designed to withstand relatively high surge currents for short durations. For detailed specifications, refer to the manufacturer's datasheet.