Analog Devices Inc. 5B37-J-11-FC

Overview

5B37-J-11-FC from Analog Devices is a single-channel isolated thermocouple input signal conditioner for Type J thermocouples, delivering 0 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 error 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-11-FC datasheet, 5B37-J-11-FC pinout, 5B37-J-11-FC application, or 5B37-J-11-FC equivalent, key selection criteria include thermocouple type support (J only), isolated 0–5 V output compliance, cold-junction compensation accuracy, 4 Hz low-pass filtering for 60 Hz noise rejection, and hot-swappable 5B-series mechanical compatibility.

Technical Context

The 5B37-J-11-FC implements transformer-coupled galvanic isolation with proprietary modulation for linear signal recovery, supporting fully floating differential field-side inputs without grounding. Its chopper-stabilized amplifier enables stable gain (±0.0025%/°C) and low-drift zero-scale adjustment via laser-trimmed offset subtraction.

Internal multi-pole low-pass filtering provides −3 dB cutoff at 4 Hz, yielding 60 dB normal-mode rejection at 60 Hz and >160 dB common-mode rejection with 1 kΩ source imbalance. The module includes an active-low enable-controlled series output switch and open-thermocouple detection with upscale response (10 s settling).

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 ISO-TC-100, the 5B37-J-11-FC provides superior isolation integrity (1500 V_rms vs. non-isolated/reinforced), precise 0–5 V output scaling, and best-in-class cold-junction compensation-making it optimal for safety-critical, high-accuracy industrial analog input stages where modularity and hot-swap capability are essential.

Availability

5B37-J-11-FC is available at Aetrix Electronics and suitable for industrial temperature monitoring, PLC analog input conditioning, and hazardous location sensing requiring stable component supply, long-term lifecycle support, and certified safety compliance.

Supply support for 5B37-J-11-FC 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 specifically for rugged industrial signal conditioning-delivering transformer isolation, factory-calibrated accuracy, and modular hot-swappable deployment in harsh electromagnetic and thermal environments.

FAQ

What thermocouple types does the 5B37-J-11-FC support?

The 5B37-J-11-FC is configured exclusively for Type J thermocouples, covering the standard range of −100°C to +760°C. Unlike generic 5B37 models, this variant is factory-set for J-type characteristics-including Seebeck coefficient, cold-junction compensation curve, and linearization algorithm-and does not support K, T, or other thermocouple types.

Does the 5B37-J-11-FC require external cold-junction compensation?

No, the 5B37-J-11-FC includes integrated cold-junction compensation with ±0.25°C accuracy at +25°C ambient. It uses an onboard sensor referenced to the module's input terminal temperature-no external CJC sensor or circuitry is needed. This is confirmed in the General Description section of the Rev. 0 datasheet.

What is the meaning of "upscale open input response" for the 5B37-J-11-FC?

The 5B37-J-11-FC drives its output to full scale (+5 V) within 10 seconds when the thermocouple circuit opens-providing immediate, unambiguous fault indication. This behavior is intrinsic to the module's internal detection circuit and requires no external components; a downscale response would need a 47 MΩ resistor across terminals 1 and 3, per datasheet guidance.

Can the 5B37-J-11-FC be used with non-5B-series backplanes?

No-the 5B37-J-11-FC relies on mechanical alignment, pin-compatible socket interface, and backplane-integrated cold-junction sensors (e.g., AC1361) specified only for Analog Devices' 5B-series mounting hardware. Using it with non-5B carriers risks misalignment, loss of CJC accuracy, and failure to meet FM/CSA certifications.

What is the maximum continuous input voltage the 5B37-J-11-FC can withstand?

The 5B37-J-11-FC withstands 240 V_rms continuously at its input screw terminals without damage or performance degradation. This rating is verified per datasheet specifications and enables reliable operation in industrial settings where accidental field-side overvoltages may occur-protecting downstream data acquisition or control circuitry.