The Dataforth SCM5B39-03 is an isolated current output module that converts analog voltage signals into proportional 0-20 mA current outputs for industrial control applications. Built with transformer-based 3-way galvanic isolation at 1500 Vrms, it eliminates ground-loop interference and protects against transient voltages in harsh environments. The module delivers ±0.03% accuracy with exceptional linearity of ±0.005%, making it ideal for precision process control, actuator drives, and valve control loops where signal integrity is paramount.
## Technical Specifications
• Input Range: 0 to +5 V (voltage or process current)
• Output Range: 0 to 20 mA unipolar current
• Accuracy: ±0.03% of span (typical)
• Linearity: ±0.005% (typical)
• Isolation Voltage: 1500 Vrms, transformer-coupled, 3-way isolation
• Common-Mode Rejection: 110 dB (up to 160 dB)
• Normal-Mode Rejection: 95 dB at 60 Hz
• Bandwidth: 400 Hz
• Input Withstand Voltage: 240 Vrms continuous
• Output Protection: 240 VAC continuous rated
• Power Supply: +5 VDC ±5%
• Power Consumption: 30 mA typical
• Thermal Drift: ±1 µV/°C (typical)
• Output Noise: 150 µVrms typical
• Operating Temperature: -40°C to +85°C
## Key Features
• Track-and-hold input circuit with WR EN logic control (pin 23)
• Computer-side circuit floatable to ±50 V from power common
• ANSI/IEEE C37.90.1 transient protection compliance
• 14-pin modular interface
• Compact form factor: 2.28 × 2.26 × 0.60 inches, 62 g
## Typical Applications
• Proportional valve control in hydraulic and pneumatic systems
• Actuator positioning and motion control
• Process loop current transmission in data acquisition
• Industrial automation with ground isolation requirements
• Noise-sensitive control environments
## Compatibility & Integration
Mounts as a plug-in modular board with standard 14-pin interface. I/O Common reference on pin 19. Write Enable control via pin 23 allows real-time mode switching between track (active input) and hold (signal freeze) operation for synchronized control systems.
