Analog Devices Inc. 5B37-J-01-NI

Overview

5B37-J-01-NI from Analog Devices is a single-channel isolated thermocouple input signal conditioner for Type J thermocouples, delivering 0 V to +5 V isolated output with ±0.05% span accuracy, 1500 V_rms continuous isolation, and 4 Hz bandwidth. It features chopper-stabilized amplification (±1 µV/°C input offset drift), internal cold-junction compensation (±0.25°C at +25°C), and 240 V_rms input protection-used in industrial temperature monitoring systems interfacing with PLCs or data acquisition hardware.

For engineers reviewing the 5B37-J-01-NI datasheet, 5B37-J-01-NI pinout, 5B37-J-01-NI application, or 5B37-J-01-NI equivalent, key selection considerations include thermocouple type support (J only), open-circuit detection behavior (upscale), input protection rating (240 V_rms), isolation voltage (1500 V_rms), and compatibility with 5B Series backplanes requiring screw-terminal field wiring and cold-junction sensing.

Technical Context

The 5B37-J-01-NI implements transformer-based isolation with proprietary modulation for linear signal transfer and employs chopper stabilization to achieve ±1 µV/°C input offset drift. Its differential floating input eliminates need for input grounding, while internal multi-pole low-pass filtering delivers 60 dB normal-mode rejection at 60 Hz.

Cold-junction compensation uses an on-board sensor (e.g., AC1361) to correct parasitic thermocouple errors, enabling ±0.25°C accuracy at +25°C ambient. The module includes an active-low enable-controlled series output switch and requires output common to remain within ±3 V of power common.

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-J and SCXI-1122, the 5B37-J-01-NI offers deterministic 4 Hz bandwidth, factory-trimmed cold-junction compensation, and mechanical/electrical compatibility with 5B Series backplanes-making it optimal for fixed-configuration industrial control panels requiring drop-in reliability and minimal configuration.

Availability

5B37-J-01-NI is available at Aetrix Electronics and suitable for industrial temperature monitoring, PLC analog input conditioning, and hazardous-area signal interface requiring stable component supply, long-lifecycle availability, and certified safety compliance.

Supply support for 5B37-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 company specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision measurement and industrial control.

The 5B Series was designed as a cost-effective, plug-in solution for industrial signal conditioning-delivering transformer isolation, cold-junction compensation, and ruggedized packaging for harsh factory environments.

FAQ

What thermocouple types does the 5B37-J-01-NI support?

The 5B37-J-01-NI supports Type J thermocouples exclusively, with a calibrated input range of -100°C to +760°C. It does not support K, T, E, or other thermocouple types-those require dedicated models like 5B37-K-02 or 5B37-T-03. The "J" in the part number explicitly denotes Type J configuration, including laser-trimmed gain and cold-junction compensation optimized for J-characteristic voltage curves.

Does the 5B37-J-01-NI require external cold-junction compensation?

No, the 5B37-J-01-NI includes internal cold-junction compensation using an integrated sensor (compatible with AC1361 on 5B backplanes), delivering ±0.25°C accuracy at +25°C ambient. This eliminates need for external CJC hardware or software correction-critical for out-of-the-box system readiness in industrial PLC and DAQ installations.

What is the meaning of "NI" in the 5B37-J-01-NI part number?

The "NI" suffix in 5B37-J-01-NI indicates nonincendive certification per Factory Mutual (FM) and CSA standards for Class 1, Division 2, Groups A, B, C, and D hazardous locations. It confirms the module's intrinsic safety design-no special enclosures required-when installed per 5B Series mounting guidelines and used with approved backplanes.

Can the 5B37-J-01-NI be hot-swapped in a live 5B backplane?

Yes, the 5B37-J-01-NI is fully hot-swappable: it can be inserted or removed from any powered 5B Series backplane without disrupting field wiring, system power, or adjacent modules. This capability relies on its floating differential input, transformer isolation, and absence of power sequencing dependencies-enabling maintenance without process shutdown.

What output behavior occurs if the Type J thermocouple wire breaks?

If the thermocouple opens, the 5B37-J-01-NI generates an upscale output (>5 V) after approximately 10 seconds-providing unambiguous fault detection without external circuitry. This behavior is inherent to its input bias current path and internal comparator; a downscale response can be implemented by connecting a 47 MΩ resistor across terminals 1 and 3, but default operation is upscale.