Analog Devices Inc. 5B37-B-06-NI

Overview

5B37-B-06-NI from Analog Devices is a single-channel isolated thermocouple input signal conditioner for Type B thermocouples, delivering 0 to +5 V isolated output with ±0.05% span accuracy, 1500 V_rms continuous isolation, and 4 Hz bandwidth. It provides cold-junction compensation (±0.25°C @ +25°C), 240 V_rms input protection, and hot-swappable operation in industrial control systems.

For engineers reviewing the 5B37-B-06-NI datasheet, 5B37-B-06-NI pinout, 5B37-B-06-NI application, or 5B37-B-06-NI equivalent, key selection criteria include thermocouple type support (Type B, 0°C to +1800°C), isolated 0–5 V output compliance, CJC accuracy, input protection rating, and compatibility with 5B Series backplanes and AC1361 cold-junction sensors.

Technical Context

The 5B37-B-06-NI implements transformer-based galvanic isolation with proprietary modulation for linear signal recovery, featuring chopper-stabilized amplification (±1 µV/°C input offset drift) and multi-pole low-pass filtering (4 Hz –3 dB cutoff). Its differential floating input eliminates need for field-side grounding.

It integrates internal cold-junction compensation referenced to the AC1361 sensor on compatible backplanes, delivers open-thermocouple detection via upscale response, and uses an active-low enable-controlled series output switch for multiplexing elimination - all while maintaining ±3 V output common-to-power common tolerance.

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.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADAM-4018-B and SCXI-1122, the 5B37-B-06-NI offers superior galvanic isolation integrity (1500 V_rms continuous), factory-trimmed hardware CJC, and true field-wiring hot-swap capability - making it optimal for standalone, safety-critical, or retrofit industrial analog signal conditioning where reliability and ease of maintenance are paramount.

Availability

5B37-B-06-NI is available at Aetrix Electronics and suitable for industrial temperature monitoring, furnace control, refinery safety systems, and power plant boiler supervision requiring stable component supply, long-term lifecycle support, and certified hazardous-area compliance.

Supply support for 5B37-B-06-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 precision measurement and industrial control.

The 5B Series was engineered as a cost-effective, plug-in signal conditioning solution for harsh industrial environments - delivering transformer isolation, laser-trimmed accuracy, and hot-swap readiness without custom design effort.

FAQ

What thermocouple types does the 5B37-B-06-NI support?

The 5B37-B-06-NI is specifically configured for Type B thermocouples with an input range of 0°C to +1800°C. It does not support other thermocouple types - each 5B37 variant (e.g., 5B37-K-02, 5B37-T-03) is factory-set for one specific type. The "B-06" suffix explicitly denotes Type B calibration and range; using it with J, K, or other thermocouples will produce inaccurate readings.

Does the 5B37-B-06-NI require an external cold-junction sensor?

No - the 5B37-B-06-NI relies on the AC1361 cold-junction sensor mounted on compatible 5B Series backplanes or mounting cards. This integrated sensor enables automatic cold-junction compensation with ±0.25°C accuracy at +25°C. No external sensor or wiring is needed when used with standard 5B infrastructure.

What is the meaning of "-NI" in the part number 5B37-B-06-NI?

The "-NI" suffix indicates Factory Mutual (FM) and Canadian Standards Association (CSA) approval for Class 1, Division 2, Groups A, B, C, and D hazardous locations. It certifies the 5B37-B-06-NI as nonincendive - meaning it cannot ignite flammable atmospheres under normal or single-fault conditions, eliminating need for explosion-proof enclosures.

Can the 5B37-B-06-NI be used with non-5B backplanes?

The 5B37-B-06-NI is mechanically and electrically designed for 5B Series sockets and backplanes (e.g., 5B30, 5B37, 5B38). While physical insertion may be possible in non-5B carriers, full functionality - including cold-junction compensation, hot-swap enablement, and proper power sequencing - is only guaranteed with certified 5B infrastructure. Use outside this ecosystem voids performance and safety specifications.

How does open thermocouple detection work on the 5B37-B-06-NI?

The 5B37-B-06-NI generates an upscale output (e.g., >5 V) when the thermocouple circuit opens. This default behavior requires no external components. To obtain a downscale response instead (e.g., <0 V), a 47 MΩ, 0.25 W resistor must be connected across screw terminals 1 (–EXC) and 3 (HI); this pulls the input toward a known reference to force low output on open circuit.