Keysight / Agilent / HP E1339A 72-Channel Digital Output/Relay Driver

The Keysight E1339A is a 72-channel digital output and relay driver module for VXI/VMEbus mainframes. This B-size, single-slot register-based module delivers open-collector outputs capable of sinking up to 200 mA per channel at voltages to 32 V, making it suited for controlling external relays and digital switching in industrial automation and test environments. Each channel references to chassis ground and includes flyback protection for relay coil transients. An onboard jumper selects +5 V, +12 V, or +24 V power rails for external loads—note that +24 V availability depends on mainframe type. The module operates as 72 independent channels or as 36 dual-output pairs optimized for latching microwave relay control.

– Technical Specifications

• Module Type: VXI Module (B-size, 1-slot)
• Architecture: Register-based
• Channel Count: 72 channels
• Channel Modes: Digital output with external pull-up resistors; relay driver for external relays
• Output Type: Open-collector
• Current Sink: Up to 200 mA per channel
• Voltage Switching: Up to 32 V
• Channel Reference: Chassis ground
• Protection: Relay coil flyback protection
• Power Supply Selection: Onboard jumper (±5 V, +12 V, or +24 V from VXI backplane)
• Weight: 2 lbs

– Key Features

• High-density switching with 72 independent output channels
• Flexible power supply configuration via jumper selection
• Open-collector architecture allows direct relay and high-voltage switching
• Integrated flyback protection extends relay lifetime
• Dual-output mode optimizes control of latching relays
• Includes two ribbon cable rolls and output connectors

– Typical Applications

• Industrial automation and process control
• Relay and contactor switching in test systems
• Microwave relay matrix control
• Distributed signal routing and switching

– Compatibility & Integration

• Compatible with VXIbus and VMEbus mainframes (B-size and C-size)
• SCPI and VXI plug&play drivers provided
• Individual channel or dual-output command control
• User manuals and datasheets available for E1339A and Z2309A variants