Dataforth SCM5B39-03 Current Output Module

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.