The Dow-Key Microwave 401-290802A is a Single Pole Double Throw (SPDT) electromechanical RF switch engineered for broadband signal routing from DC to 18 GHz. This 50 Ohm switch delivers precision switching performance across test and measurement, aerospace, defense, and telecommunications applications where signal integrity and reliability are non-negotiable.
## Technical Specifications
**RF Performance**
• Frequency range: DC to 18 GHz
• Impedance: 50 Ohms
• VSWR: 1.10 max (DC–1 GHz), 1.15 max (1–4 GHz), 1.20 max (4–8 GHz), 1.30 max (8–12 GHz), 1.35 max (12–18 GHz)
• Isolation: 85 dB min (DC–1 GHz), 80 dB min (1–4 GHz), 70 dB min (4–8 GHz), 65 dB min (8–12 GHz), 60 dB min (12–18 GHz)
• Insertion loss: 0.10 dB max (DC–1 GHz), 0.15 dB max (1–4 GHz), 0.20 dB max (4–8 GHz), 0.30 dB max (8–12 GHz), 0.35 dB max (12–18 GHz)
**Electrical**
• Operating voltage: 12 Vdc (11–14 Vdc) or 28 Vdc (24–32 Vdc)
• Switching time: 15 mS maximum
• Circuit: TTL High
• Connectors: SMA Female
**Mechanical**
• Mechanical life: 1,000,000 minimum cycles
• Vibration (operating): 10 G RMS, 20–2000 Hz
• Mechanical shock (non-operating): 50 G, 1/2 Sine, 11 mS
• Weight: 2.5 oz (71 g)
## Key Features
• Low insertion loss across the operating band minimizes signal degradation
• High isolation ensures clean path switching and minimal crosstalk
• Failsafe design with TTL compatibility for automated control systems
• Rated for 1,000,000 switching cycles
• Compact 50 Ohm architecture with SMA connectors
## Typical Applications
• RF test and measurement systems requiring multi-path signal routing
• Aerospace and defense systems with frequency agility requirements
• Telecommunications infrastructure supporting broadband switching
• Laboratory setups demanding low-loss signal path selection
## Compatibility & Integration
SMA Female connectors enable direct integration into standard 50 Ohm microwave systems. TTL High logic supports industry-standard digital control interfaces. Operating voltage options (12 Vdc or 28 Vdc) accommodate diverse power supply architectures.
