Analog Devices Inc. 5B47-CUSTOM

Overview

5B47-CUSTOM from Analog Devices is a single-channel, isolated, linearized thermocouple input signal conditioner supporting J, K, T, E, R, S, and B thermocouple types. It delivers a precision 0 V to +5 V isolated output with ±0.5°C to ±5.1°C accuracy (model-dependent), 4 Hz bandwidth, and 1500 V_rms continuous input-to-output isolation - used in industrial temperature monitoring systems requiring cold-junction compensation and field-side overvoltage protection.

For engineers reviewing the 5B47-CUSTOM datasheet, 5B47-CUSTOM pinout, 5B47-CUSTOM application, or 5B47-CUSTOM equivalent, key selection criteria include custom input/output range configuration, open-thermocouple detection behavior, chopper-stabilized amplifier drift (±1 µV/°C), CJC accuracy contribution, and compatibility with 5B Series backplanes for hot-swap deployment in Class 1, Division 2 hazardous locations.

Technical Context

The 5B47-CUSTOM implements transformer-based galvanic isolation with proprietary modulation for linear signal recovery, featuring a fully floating differential field-side input that eliminates grounding requirements. Its chopper-stabilized input amplifier provides ±1 µV/°C input offset drift and internal laser-trimmed zero-scale subtraction for expanded-scale measurements.

It integrates multi-pole low-pass filtering (4 Hz –3 dB), 160 dB common-mode rejection at 50/60 Hz with 1 kΩ source imbalance, and 60 dB normal-mode rejection - enabling accurate microvolt-level thermocouple signal acquisition in high-noise industrial environments. The module supports active-low output enable control and generates an upscale open-input response within 10 seconds.

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 interface. Compatible with FM- and CSA-approved backplanes (e.g., 5B-01, 5B-08) for hot-swap insertion.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar isolated thermocouple conditioning applications.

Compared with ADAM-4018 and ISO-TC, the 5B47-CUSTOM uniquely combines certified hazardous-area operation, factory-configurable linearization, screw-terminal field wiring, and hot-swap readiness - making it optimal for maintainable, safety-critical industrial analog I/O systems.

Availability

5B47-CUSTOM is available at Aetrix Electronics and suitable for industrial temperature monitoring, hazardous location process control, and legacy system retrofit requiring stable component supply, long-lifecycle support, and certified isolation performance.

Supply support for 5B47-CUSTOM 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 leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets since 1965.

The 5B Series was engineered for rugged industrial signal conditioning - delivering transformer-isolated, linearized thermocouple and voltage input modules with FM/CSA hazardous-area approvals and automated manufacturing consistency.

FAQ

What thermocouple types does the 5B47-CUSTOM support?

The 5B47-CUSTOM supports J, K, T, E, R, S, and B thermocouple types. Unlike fixed-model variants (e.g., 5B47-K-05), the CUSTOM version allows user-defined input ranges and retains full hardware linearization for all supported types via internal polynomial correction circuitry - verified in the 5B47 Rev. 0 datasheet functional description and model table footnotes.

How is cold-junction compensation implemented in the 5B47-CUSTOM?

The 5B47-CUSTOM uses an internal cold-junction compensation (CJC) sensor with ±0.25°C initial accuracy at +25°C ambient. It relies on the AC1361 CJC sensor mounted on compatible 5B Series backplanes (e.g., 5B-01), referenced via Pin 1 (–EXC) and Pin 2 (LO). This architecture corrects parasitic thermocouple errors at the screw terminals without external components - confirmed in the GENERAL DESCRIPTION and Specifications sections of the 5B47 Rev. 0 datasheet.

Can the 5B47-CUSTOM be used in Class 1, Division 2 hazardous locations?

Yes, the 5B47-CUSTOM is approved by Factory Mutual (FM) and the Canadian Standards Association (CSA) for Class 1, Division 2, Groups A, B, C, and D locations. These certifications confirm its nonincendive operation - meaning it may be installed where flammable gases exist only under fault conditions, without requiring explosion-proof enclosures. This approval applies to the full 5B Series, including 5B47-CUSTOM, as stated on page 2 of the Rev. 0 datasheet.

What is the open-thermocouple detection behavior of the 5B47-CUSTOM?

The 5B47-CUSTOM provides an upscale open-input response: when the thermocouple is disconnected, the output rises above +4.9 V within 10 seconds. For downscale indication, a 20 MΩ, 0.25 W resistor must be externally connected across Pins 1 and 3. This behavior is inherent to the module's internal fault-detection circuitry and is independent of custom range configuration - documented on page 2 of the 5B47 Rev. 0 datasheet under "Accurate and System-Ready."

Does the 5B47-CUSTOM require external power supply filtering or regulation?

No, the 5B47-CUSTOM operates from a nominal +5 V ±5% supply and includes internal regulation. Its power supply sensitivity is specified as ±2 µV/% of V_s, and total supply current is 30 mA - allowing direct connection to standard 5B backplane power rails without added filtering. This design simplifies system integration and is validated across the –40°C to +85°C operating range per the Rev. 0 datasheet Electrical Specifications table.