The HFD4/4.5-S is a miniature, high-sensitivity signal relay manufactured by HongFa. Designed for applications demanding reliable switching of low-level signals, it's commonly found in telecommunications, instrumentation, and automation systems. This relay offers a compact footprint, low power consumption, and sealed construction making it suitable for high-density board layouts, energy-efficient designs, and automated manufacturing processes.

Applications

• Telecommunication equipment
• Instrumentation and measurement devices
• Automatic test equipment (ATE)
• Security systems
• Medical equipment

Features

• Miniature size: Space-saving design for high-density PCB mounting.
• High sensitivity: Low coil power consumption.
• High insulation resistance: Provides electrical isolation between coil and contacts.
• Sealed construction: Allows for automated soldering and cleaning processes.
• 4.5VDC Coil: Designed to operate with a 4.5VDC coil voltage.

Benefits

• Reduced board space: The miniature size allows for more components on the PCB.
• Energy efficiency: Low coil power consumption reduces overall system power requirements.
• Improved reliability: High insulation resistance and sealed construction ensure reliable operation in various environments.
• Simplified manufacturing: The sealed construction allows for automated soldering and cleaning.
• Optimized for 4.5VDC Systems: Directly compatible with systems using 4.5VDC power supplies.

Additional Details

The HFD4/4.5-S relay operates with a 4.5VDC coil voltage. Its contact arrangement is usually 2 Form C (DPDT - Double Pole Double Throw). Contact ratings vary but often include a maximum switching voltage of around 30VDC and a maximum switching current of approximately 0.3A. Insulation resistance between coil and contacts is typically greater than 10^9 ohms. The operating temperature range is typically between -40°C and +85°C. The 'S' in the part number typically denotes a sealed construction, which enhances its reliability in harsh environments and allows for automated soldering and cleaning processes during manufacturing. This relay is designed for consistent performance and a long operational life, making it suitable for applications where signal integrity is critical and a 4.5VDC coil voltage is required.