Analog Devices Inc. 5B42-02-NI

Overview

5B42-02-NI from Analog Devices is a single-channel isolated process current input signal conditioner that interfaces with 4–20 mA two-wire transmitters, provides a regulated 20 V loop supply, and delivers a +2 V to +10 V low-impedance output with ±0.05% span accuracy, 100 Hz bandwidth, and 1500 V_rms input-to-output isolation. It is used in hazardous-area industrial control systems requiring nonincendive Class 1, Division 2 operation.

For engineers reviewing the 5B42-02-NI datasheet, 5B42-02-NI pinout, 5B42-02-NI application, or 5B42-02-NI equivalent, key selection criteria include its internal 25 Ω sense resistor, true three-port isolation (input/output/power), 240 V_rms input terminal withstand rating, hot-swappable 5B-series compatibility, and FM/CSA nonincendive certification for hazardous locations.

Technical Context

The 5B42-02-NI implements transformer-coupled, chopper-stabilized signal conditioning with proprietary modulation/demodulation for linear DC transfer across isolation barriers. Its floating differential input eliminates field-side grounding requirements, while the internal 25 Ω precision sense resistor enables direct 4–20 mA loop connection without external components.

It features a five-pole low-pass filter (−3 dB at 100 Hz), 200 µV_pk-pk output noise in 100 kHz bandwidth, and active output enable control with 6 µs switching. Common-mode rejection exceeds 140 dB at 50/60 Hz with 1 kΩ source imbalance, and transient protection complies with ANSI/IEEE C37.90.1-1989.

Key Specifications

Pinout & Package

Package: 2.275" × 2.375" × 0.595" (57.8 mm × 59.1 mm × 15.1 mm) potted module with standardized 5B-series footprint and screw-terminal field connections. Compatible with all 5B-series backplanes including 5B01 and 5B08.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar isolated current-input signal conditioning applications.

Compared with ADAM-4017+ and ISO4-20MA, the 5B42-02-NI delivers factory-calibrated accuracy, integrated 20 V loop supply, FM/CSA nonincendive approval, and plug-and-play hot-swap capability-reducing system integration time and eliminating field wiring modifications.

Availability

5B42-02-NI is available at Aetrix Electronics and suitable for industrial signal isolation, hazardous-area process monitoring, and PLC analog input conditioning requiring stable component supply, long-term lifecycle support, and certified nonincendive operation.

Supply support for 5B42-02-NI includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Analog Devices is a global semiconductor company specializing in high-performance analog, mixed-signal, and digital signal processing technologies for industrial, automotive, communications, and healthcare applications.

The 5B Series was designed specifically for rugged industrial signal conditioning-delivering transformer-isolated, hot-swappable, FM/CSA-certified modules that replace costly custom designs and legacy conditioners in hazardous and high-noise environments.

FAQ

What is the function of the +EXC terminal on the 5B42-02-NI?

The +EXC terminal on the 5B42-02-NI provides a regulated 20 V dc isolated loop supply to power two-wire 4–20 mA transmitters. It is current-limited and protected to withstand 240 V_rms continuous overvoltage, eliminating the need for external power sources or protection components. This feature is integral to the 5B42-02-NI's ability to operate as a self-contained signal conditioner in field installations.

Does the 5B42-02-NI require an external current sense resistor?

No, the 5B42-02-NI incorporates a precision 25 Ω internal current sense resistor, calibrated and specified as part of the module's accuracy budget. This eliminates tolerance errors from external resistors, removes installation steps on the backplane, and ensures protection up to 240 V_rms at the input terminals-key differentiators of the 5B42-02-NI versus discrete solutions.

What safety certifications apply to the 5B42-02-NI?

The 5B42-02-NI is approved by Factory Mutual (FM) and the Canadian Standards Association (CSA) for Class 1, Division 2, Groups A, B, C, and D - certifying it as nonincendive for use in hazardous locations where flammable gas may exist only under fault conditions. These approvals are specific to the 5B42-02-NI and cover its entire operational envelope per the Rev. 0 datasheet.

Can the 5B42-02-NI be used with a +1 V to +5 V output range?

No - the 5B42-02-NI is factory-configured exclusively for +2 V to +10 V output. The +1 V to +5 V variant is the 5B42-01 model. Output range is fixed per model number and cannot be adjusted in-circuit; selecting the correct variant (5B42-01 vs. 5B42-02-NI) is required during procurement to match the receiving system's input range.

How does the 5B42-02-NI achieve true three-port isolation?

The 5B42-02-NI achieves true three-port isolation via independent transformer coupling between input, output, and power domains - rated at 1500 V_rms input-to-output and input-to-power, and 250 V_rms output-to-power. This architecture eliminates any required return path between power and output commons, enabling flexible grounding schemes and robust noise immunity - a core design feature of the 5B42-02-NI.