The HFD4/5-SR(257) is a miniature signal relay manufactured by HongFa. It is designed for applications requiring reliable signal switching with a 5VDC coil voltage. The 'SR' designation likely indicates a specific contact material optimized for surge resistance or low contact resistance. The (257) likely refers to a specific production batch or internal specification.

Applications

• Telecommunications equipment
• Instrumentation
• Medical devices
• Security systems
• Industrial control systems

Features

• Miniature size
• High sensitivity
• Low coil power consumption
• High switching capacity
• 5VDC coil voltage
• SPDT contact arrangement
• Sealed construction for environmental protection

Benefits

• Reduced PCB space requirements
• Energy efficient operation
• Reliable signal switching
• Long operational life
• Easy integration into existing designs
• Protection against dust and humidity

Additional Details

This relay operates with a 5VDC coil voltage, a common voltage in many electronic systems. The SPDT contact provides versatile switching capabilities. The 'SR' designation, as detailed in the datasheet, defines the specific contact material and its properties related to surge handling or contact resistance. Its robust construction and sealed design provide reliable performance in various operating conditions. Consult the datasheet for detailed electrical characteristics, including contact rating, coil resistance, insulation resistance, and operating temperature range, to ensure correct application.