The Dow-Key Microwave 401R-390807 is a single-pole double-throw (SPDT) electromechanical RF switch engineered for microwave signal routing across DC to 18 GHz. Built for demanding aerospace, electronic warfare, radar, automated test equipment, and communications applications, this 50-ohm switch delivers reliable performance in mission-critical systems.
## Technical Specifications
**Frequency & RF Performance**
• Frequency range: DC to 18 GHz
• Impedance: 50 Ohms
• VSWR: 1.35 maximum @ 18 GHz (1.50 maximum @ 26.5 GHz with ‘K’ option)
• Insertion loss: 0.35 dB maximum (12–18 GHz); 0.50 dB maximum (18–26.5 GHz, ‘K’ option)
• Isolation: 60 dB minimum (12–18 GHz); 55 dB minimum (18–26.5 GHz, ‘K’ option)
**Electrical**
• Operating voltage: 12 Vdc (11–14 Vdc range) or 28 Vdc (24–32 Vdc range)
• Coil current: 195–230 mA @ 12 Vdc; 95–120 mA @ 28 Vdc
• Standby current: 35 mA (12 Vdc CANBus); 26 mA (24 Vdc TTL)
• Switching time: 15 mS maximum
## Key Features
• Dual actuator options: latching or failsafe configurations
• Control interfaces: TTL High/Low, CANBus, and binary logic
• Mechanical life: 1,000,000 cycles minimum
• Operating temperature: −25°C to +65°C (standard); −55°C to +85°C (extended ‘T’ option)
• Environmental survivability: 10G RMS vibration (20–2000 Hz operating); 50G mechanical shock (1/2 sine, 11 mS non-operating)
• Compact form factor: 2.5 oz (71 g)
## Typical Applications
Aerospace systems, electronic warfare platforms, radar signal routing, automated test equipment, and communications infrastructure requiring fast switching with low insertion loss and high isolation.
## Compatibility & Integration
Standard SMA female connectors ship as default; alternative connector types (BNC, TNC, UHF, C, GPO, BMA, 3.5 mm, TPS, HN, SC, 7/16 DIN, PC board mount pins) are available. Circuit options include high-power variants, pulse latching with suppression diodes, and TTL high logic configurations. Indicator options accommodated.
