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$607.00 (USA and Canada only)

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Isolated SNAP 2-Ch 4-20 mA Current Loop Analog Output Module, with Loop Sourcing

Production Specification

The SNAP-AOA-23-iSRC module provides two channels of current output with a nominal output range of 4 mA to 20 mA. The module includes built-in loop sourcing capability.

With the connection of a single 24 V power supply, the module sources two 24 V loops. The loop sources are internally connected to the individual outputs. The two channels and their loop sources are isolated from each other; they do not share any field connection. In addition, each loop source is current limited so that an external fault on one loop will not affect the other.

Part of the SNAP PAC System, the module mounts on a SNAP PAC rack with a SNAP PAC brain or rack-mounted controller. Analog, digital, and serial I/O modules can all be on the same rack. Such an I/O unit is also well suited for PC-based control or for use as intelligent remote I/O for an Allen-Bradley Logix PLC system, such as ControlLogix, MicroLogix, or CompactLogix.


12-bit serial data (each channel)


4 to 20 mA (each channel)


16 mA


3.9 microamps

Response Time
(% of span/delta I/ delta time)

99.9%/15.98 mA/3 mS

DC Common Mode Rejection

>-120 dB

AC Common Mode Rejection

>-120 dB @ 60 Hz

Maximum Operating
Common Mode Voltage

250 V

Common Mode Resistance

>1000 Megohms


0.1% of Span

Gain Temperature Coefficient

50 PPM/°C

Offset Temperature Coeffi­cient

20 PPM/°C

Max. Loop Resistance
@ Loop Supply

950 Ohms

Ambient Temperature:


-20 °C to 70 °C
-40 °C to 85 °C


5-95%, non-condensing

Isolation: Optical

4000 V

Isolation: Transformer

1500 V

Isolation: Channel to Channel

250 V continuous
(1500 V transient)

Power Requirements

5 Volts DC (±0.15) @ 200 mA

Power Requirements -
Loop Power (Input)

From separate field connector;
24 VDC nominal (70 mA max)
@ 24 V input, both loops
@ 20 mA), 30 VDC maximum

Loop Power (Output)

24 VDC (±1.5 V) @ 20 mA
Open loop: 30 V maximum
Shorted loop: 24 mA nominal

LED on top of module

Indicates that there is power to the 24v source supply 2-pin connector

Agency Approvals


Torque, hold-down screws

Not to exceed 1 in-lb (0.11 N-m)

Torque, connector screws

5.22 in-lb (0.59 N-m)

Wire size range

22 to 14 AWG



SNAP PAC System Product Guide

This document lists and describes all current Opto 22 SNAP PAC System part numbers, including PAC Project software, SNAP PAC controllers, and SNAP I/O modules of all kinds. SNAP PAC mounting racks and SNAP power supplies are also listed.

SNAP Analog Output Modules Data Sheet

SNAP I/O analog output modules are part of Opto 22's SNAP PAC System. This document includes descriptions, specifications, and wiring and dimensional diagrams for all SNAP analog output modules:

UKCA Declaration of Conformity (EMC, LVD, RoHS)

This document is the Manufacturer's Declaration of Conformity for the products listed herein, in accordance with the rules, regulations and standards of the United Kingdom. The models cited have been tested to the essential requirements listed in the Standards section, and fully comply with the legislation as listed in UK Legislation section.

Opto 22 RoHS 3 Statement of Compliance - Restriction of Hazardous Substances

This document is a statement of compliance with the EU Directive 2015/863/EU, Restriction of Hazardous Substances (RoHS 3). This document lists Opto 22 products that comply with the substance restrictions of the RoHS 3 directive.

UL Approval Document

This document lists all Opto 22 part numbers that have the Underwriters Laboratory (UL) approval.

CE Declaration: Low Voltage

This document is the Manufacturer's Declaration for the listed products as mentioned in the attachment - to which this confirmation refers - that they are in accordance with the mentioned European, international and/or national standards and regulations.

CAD 3D Drawing: SNAP-AOA-23-iSRC Analog Output Module

This CAD file contains a 3-dimensional drawing of the SNAP-AOA-23-iSRC analog output module, which provides two isolated channels of current output with a nominal output range of 4 mA to 20 mA and also includes built-in loop sourcing capability.

CAD Drawing: SNAP I/O Module

This CAD file includes drawings that apply to most SNAP analog and digital I/O modules.

Video: SNAP PAC System Overview

This overview describes the four integrated components of the SNAP PAC system: software, controllers, brains and I/O. This hardware and software system is designed for industrial control, remote monitoring and data acquisition.

Video: Securing SNAP Module

A quick overview on securing a SNAP Module to a SNAP rack.

Accuracy vs Resolution

What's the difference between accuracy and resolution in analog I/O specifications? Try your own specs in the calculator.