The Keysight U2651A is a USB modular digital I/O module delivering 32 isolated digital inputs and 32 isolated digital outputs for data acquisition and control applications. Opto-isolated design protects connected PC systems while maintaining signal integrity across industrial automation, laboratory, and test environments. The device combines flexible I/O architecture with galvanic isolation rated to 1250 Vrms, enabling safe integration in harsh electrical environments.
Technical Specifications
Digital Input
• 32 isolated channels
• Input voltage range: 10 V to 24 V
• Logic low: 0 V to 2 V
• Logic high: 10 V to 24 V
• Maximum input current: 1.5 mA per bit
Digital Output
• 32 isolated open-drain channels
• Maximum output voltage: 35 V (external load)
• External supply voltage: 5 V to 35 V
Isolation & Protection
• Isolation rating: 1250 Vrms
• Transient voltage protection: 1250 Vpeak
Power & Interface
• USB 2.0 Hi-Speed (480 Mbps), USBTMC-USB488 compliant
• Power requirement: +12 VDC typical
• Maximum input current: 2 A
• Power consumption: 260 mA maximum at +12 VDC
• Onboard isolated supply: +5 V
Physical
• With casing: 120.00 mm × 182.40 mm × 44.00 mm (W × D × H)
• Without casing: 105.00 mm × 174.54 mm × 25.00 mm
• Weight: 565 g
Environmental
• Operating temperature: 0 °C to +55 °C
– Key Features
• 1250 Vrms galvanic isolation between input, output, and host
• Open-drain output architecture supports sinking applications to 35 V
• Dual voltage input tolerance: accepts both 10–24 V industrial and 5–35 V external supplies
• Compact profile enables embedded integration
– Typical Applications
• Industrial automation and PLC interfacing
• Environmental test chamber control
• Digital signal monitoring and relay switching
• High-voltage transient-protected data acquisition
– Compatibility & Integration
Supports Windows operating systems with IVI-COM drivers and SCPI command sets. Native integration with Keysight VEE, MATLAB R2007a, NI LabVIEW, and Microsoft Visual Studio environments (VB, C, C#, C/C++, .NET Framework). Includes Keysight Measurement Manager software. Optional terminal block accessories: U2903A or U2904A.
