Analog Devices Inc. 5B47-J-01-NI

Overview

5B47-J-01-NI from Analog Devices is an isolated, linearized thermocouple input signal conditioner for Type J thermocouples (0°C to +760°C), delivering a precision 0 V to +5 V isolated output with ±1.1°C accuracy, 1500 V_rms input-to-output isolation, and 4 Hz bandwidth. It performs cold-junction compensation, chopper-stabilized amplification, multi-pole filtering, and open-thermocouple detection in industrial measurement systems.

For engineers reviewing the 5B47-J-01-NI datasheet, 5B47-J-01-NI pinout, 5B47-J-01-NI application, or 5B47-J-01-NI equivalent, key selection criteria include thermocouple type support, linearization method, CJC accuracy, isolation rating, and hot-swappable 5B-series compatibility with standard backplanes.

Technical Context

The 5B47-J-01-NI implements transformer-based galvanic isolation with proprietary modulation, enabling stable linear signal transfer across 1500 V_rms. Its chopper-stabilized input amplifier achieves ±1 µV/°C input offset drift and supports open-thermocouple detection via upscale fail-safe response.

Internal cold-junction compensation uses an on-board sensor with ±0.25°C initial accuracy at +25°C, and multi-pole low-pass filtering provides 60 dB normal-mode rejection at 60 Hz. The module accepts differential floating inputs with no field-side grounding required and features an active-low output enable switch.

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.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 5B47-J-01-NI, the 5B47-J-02 offers improved accuracy in a reduced temperature span, while the 5B47-K-05 serves distinct sensor types-neither replaces 5B47-J-01-NI without verifying thermocouple type and range alignment in the target system.

Availability

5B47-J-01-NI is available at Aetrix Electronics and suitable for industrial temperature monitoring, PLC analog I/O expansion, and microcomputer-based measurement systems requiring stable component supply, long-lifecycle assurance, and certified hazardous-area compatibility.

Supply support for 5B47-J-01-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 leader specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision measurement and industrial control.

The 5B Series was engineered for rugged industrial signal conditioning-delivering transformer isolation, thermocouple linearization, and hot-swappable modularity in compact, FM- and CSA-certified modules for Class 1 Div 2 environments.

FAQ

What thermocouple types does the 5B47-J-01-NI support?

The 5B47-J-01-NI is specifically configured for Type J thermocouples with a calibrated input range of 0°C to +760°C. It does not support other thermocouple types-each 5B47 variant (e.g., 5B47-K-05, 5B47-T-07) is factory-trimmed for its designated thermocouple alloy and range. Using a different thermocouple type with the 5B47-J-01-NI will result in significant measurement error due to mismatched Seebeck coefficient and linearization coefficients.

Does the 5B47-J-01-NI require an external cold-junction sensor?

No-the 5B47-J-01-NI integrates cold-junction compensation (CJC) using an internal sensor with ±0.25°C accuracy at +25°C. When installed in a standard 5B-series backplane (e.g., with AC1361 CJC sensor), it leverages the backplane's dedicated CJC channel for optimal accuracy. No external sensor is needed unless custom mounting or non-standard thermal environments demand supplemental CJC calibration.

How is open thermocouple detection implemented in the 5B47-J-01-NI?

The 5B47-J-01-NI provides an upscale fail-safe response to open thermocouple conditions: when terminals HI and LO are disconnected, the output drives to full-scale +5 V after ~10 seconds. For downscale indication, a 20 MΩ, 0.25 W resistor must be connected across terminals 1 (–EXC) and 3 (HI). This behavior is hardwired and requires no configuration or firmware.

Can the 5B47-J-01-NI be used in hazardous locations?

Yes-the 5B47-J-01-NI is certified by Factory Mutual (FM) and the Canadian Standards Association (CSA) for Class 1, Division 2, Groups A, B, C, and D. These approvals confirm its suitability for use in areas where flammable gases may be present only under fault conditions, provided it is installed per the 5B Series User Manual and used with approved backplanes and enclosures.

What is the maximum allowable common-mode voltage between input and output on the 5B47-J-01-NI?

The 5B47-J-01-NI supports up to 1500 V_rms continuous common-mode voltage between input and output circuits. This rating is validated per ANSI/IEEE C37.90.1-1989 transient surge standards and enables safe operation in high-noise industrial settings where ground potential differences exceed hundreds of volts-critical for protecting downstream DAQ or PLC circuitry.