Ametek / VTI Instruments / VXI Technology SM5002 50 SPDT High-Density Basic Switch Module

The Ametek VTI Instruments SM5002 is a 50-channel SPDT high-density switch module designed for signal routing in VXIbus automated test equipment and data acquisition systems. Built on the SMIP (Switch Modularity and Interface Platform) family, the module delivers 50 independent switching points with signal integrity preserved through multi-layer PCB construction, extensive ground planes, and integrated shielding. Each relay supports 300 V ac/dc switching at 2 A maximum with path resistance below 300 mΩ and insulation resistance exceeding 1×10⁹ Ω.

The module achieves bandwidth greater than 100 MHz, insertion loss below 0.1 dB at 100 kHz, and thermal offset under 7 µV per channel. Switching time is less than 3 ms, with rated mechanical life of 1×10⁷ operations and electrical endurance of 5×10⁵ cycles at full load.

Technical Specifications

• Relay Configuration: 50 × SPDT


• Maximum Switching Voltage: 300 V ac, 300 V dc


• Maximum Switching Current: 2 A


• Maximum Switching Power: 60 W dc, 125 VA


• Path Resistance: 1×10⁹ Ω


• Thermal Offset (HI-LO): 100 MHz


• Insertion Loss: < 0.1 dB (100 kHz), < 0.2 dB (1 MHz), < 1.0 dB (10 MHz)


• Crosstalk: < -80 dB (100 kHz), < -60 dB (1 MHz), < -40 dB (10 MHz)


• Isolation: < -50 dB (100 kHz), < -45 dB (1 MHz), < -40 dB (10 MHz)


• Rated Operations: 1×10⁷ mechanical, 5×10⁵ electrical at full load


• Switching Time: < 3 ms


• Open Channel Capacitance: < 50 pF


• Channel-to-Mainframe Capacitance: < 80 pF

Key Features

• Direct register control of all relays for maximum switching speed and minimal backplane traffic


• Hardware-implemented break-before-make and make-before-break switching modes


• Downloadable scan lists with 1 MB deep pattern memory


• Backplane trigger advance capability


• Embedded virtual schematic control for simplified setup


• VXIbus +5V powered relay drive

Typical Applications

• High-density signal routing in automated test equipment (ATE)


• Multi-channel data acquisition systems


• General-purpose switching in VXIbus test platforms

Compatibility & Integration The SM5002 integrates into VXIbus mainframes as a double-slot module and interoperates with other SMIP family cards for custom switching configurations. Up to 300 individual SPDT relays can be accommodated across multiple modules in a single chassis.