HONGFA Signal Relay HFD3

Optimized for Signal Switching

The HFD3 is specifically engineered for low-level signal switching where maintaining signal integrity is paramount. Unlike power relays, signal relays prioritize low contact resistance, minimal noise, and stable performance over time.

Key Signal Switching Features:

• Gold-plated Contacts: Ensures reliable low-level switching and prevents oxidation
• Low Contact Resistance: <50mΩ initial, <100mΩ end of life
• Low Thermal EMF: <1μV/°C for precision measurements
• Excellent RF Performance: Low insertion loss up to 1GHz
• Stable Over Temperature: Consistent performance from -40°C to +85°C
• Long Signal Life: >10 million operations at rated signal level

Signal Integrity Benefits:

Technical Specifications

Signal Rating	2A at 30VDC / 1A at 125VAC
Low Level Rating	10mA at 5VDC minimum
Contact Resistance	<50mΩ initial, <100mΩ at end of life
Coil Voltage	3V, 5V, 12V, 24V DC
Coil Power	200mW typical
Contact Configuration	SPDT (1 Form C)
Package	SMD (10.2 x 5.1 x 3.7mm)
Operating Temperature	-40°C to +85°C
Signal Life	>10 million operations

RF Performance Characteristics:

• Insertion Loss: <0.1dB at 100MHz, <0.2dB at 1GHz
• Isolation: >80dB at 100MHz, >60dB at 1GHz
• VSWR: <1.2:1 at 100MHz, <1.5:1 at 1GHz
• Characteristic Impedance: 50Ω matched

Signal Switching Applications

The HFD3's superior signal switching capabilities make it ideal for demanding applications where signal quality cannot be compromised.

Test & Measurement Equipment:

• Oscilloscope Input Switching: Channel multiplexing without signal degradation
• Signal Generators: Output routing and impedance matching
• Data Acquisition Systems: Multi-channel sensor inputs
• Spectrum Analyzers: Input selection and attenuation control

Telecommunications:

• Line Cards: Subscriber line interface circuits
• PBX Systems: Extension routing and conferencing
• Modem Applications: Line/phone switching
• ISDN Equipment: Digital line switching

Industrial Instrumentation:

• Process Control: Sensor signal routing
• Calibration Equipment: Reference signal switching
• Data Loggers: Multi-point measurement systems
• Temperature Controllers: Thermocouple input selection

Medical Equipment:

• Patient Monitoring: Electrode signal switching
• Diagnostic Equipment: Signal path selection
• Laboratory Analyzers: Sample routing systems
• Imaging Systems: Detector array switching