Aeroflex / Tektronix / CDS 53A-353 Relay Switching Card

The Aeroflex/Tektronix/CDS 53A-353 Relay Switching Card is a printed circuit board assembly that provides 24 independently controlled Single Pole Single Throw (SPST) relays for signal routing and automated testing within CDS 53/63 Series Systems. Operating at speeds up to 100 operations per second with a minimum dwell time of 4 ms, this card handles RF and microwave signals with reliable repeatability. System control via ASCII character commands enables flexible test automation, while integrated LED indicators and built-in self-test diagnostics verify relay drive circuitry and relay operation using a second pole on each relay. The card integrates directly into the 53 or 63 Series Card Cage backplane with selectable address selection (0-9), making it suitable for communication, aerospace, and defense applications.

– Technical Specifications

• Manufacturer: Aeroflex / Tektronix / CDS
• Model: 53A-353
• Product Type: Relay Switching Card
• System Compatibility: CDS 53/63 Series System
• Number of Relays: 24 SPST relays, independently controlled
• Switching Speed: Up to 100 operations per second
• Minimum Dwell Time: 4 ms
• Power Supply: 5 V DC from Card Cage (4.57 V DC to 5.25 V DC)
• Maximum Quiescent Current: 0.80 A
• Peak Current: 0.85 A
• Operating Temperature: −10°C to +65°C
• Storage Temperature: −40°C to +85°C
• Humidity: Less than 95% RH, non-condensing

– Key Features

• 24 independently addressable SPST relay channels
• ASCII character-based control from system controller
• Selectable card address (0-9) via Address Select switch
• Built-in self-test with second pole verification
• LED status indicators for diagnostics
• Direct backplane integration into 53/63 Series Card Cage
• Handles RF and microwave signal switching

– Typical Applications

• Communication system test and measurement
• Aerospace and defense automated testing
• Signal routing in multi-channel test systems
• High-speed relay switching requiring repeatable operation

– Compatibility & Integration

The 53A-353 connects to the CDS 53/63 Series Card Cage via the backplane connector and pairs with the 53A-727 Analog Cable, which provides 24 pairs of single conductors—one pair per relay contact.