Agilent/Keysight E1339A

The Keysight E1339A is a VXIbus digital output and relay driver module delivering 72 channels of open collector switching in a compact B-size, 1-slot form factor. Each channel sinks up to 200 mA and switches voltages to 32 V, making it ideal for relay control, digital switching, and external device actuation in test systems and industrial automation. The module includes relay coil flyback protection and dual-mode operation: standard 72-channel independent outputs or 36-channel paired configuration for latching microwave relays.

External device power is selectable on-board via jumper - +5 V, +12 V, or +24 V from the VXI mainframe (note: +24 V requires C-size mainframes). All outputs reference to chassis ground.

Technical Specifications

• Module Type: Digital Output / Relay Driver


• VXIbus Form Factor: B-size, 1-slot, register-based


• Channels: 72 total


• Output Type: Open Collector


• Voltage Switching: Up to 32 V


• Current Sink: Up to 200 mA per channel


• Reference: Chassis ground


• Protection: Relay coil flyback protection


• External Power Rails: +5 V, +12 V, +24 V (selectable via jumper; +24 V limited to C-size mainframes)

Key Features

• Dual operation modes: 72-channel independent or 36-channel dual output for latching relays


• On-board jumper selects external device power supply voltage


• Ribbon cable interconnect (two cables supplied)


• Register-based control architecture

Typical Applications

• Relay and solenoid switching


• Digital output control in automated test systems


• Latching relay actuation


• External device power distribution and switching

Compatibility & Integration

• Standard VXIbus connectivity


• VXIplug&play drivers and SCPI command support


• Compatible with VXI chassis (B and C-size mainframes)