Analog Devices Inc. 5B37-T-15-FC

Overview

5B37-T-15-FC from Analog Devices is a single-channel isolated thermocouple input signal conditioner for Type T thermocouples, delivering 0 to +5 V isolated output with ±0.25°C cold-junction compensation accuracy at +25°C, 4 Hz bandwidth, and 1500 V_rms input-to-output isolation - deployed in industrial temperature monitoring systems interfacing with PLCs and data acquisition hardware.

For engineers reviewing the 5B37-T-15-FC datasheet, 5B37-T-15-FC pinout, 5B37-T-15-FC application, or 5B37-T-15-FC equivalent, key selection criteria include thermocouple type support (T), open-circuit detection behavior (upscale), input protection rating (240 V_rms continuous), and compatibility with FM/CSA Class 1 Division 2 hazardous locations.

Technical Context

The 5B37-T-15-FC implements chopper-stabilized amplification with laser-trimmed zero-scale offset subtraction, enabling precise expanded-scale measurements of small thermocouple voltages. Its transformer-based isolation uses proprietary modulation for linear signal recovery without grounding constraints on the field side.

Internal multi-pole low-pass filtering provides 60 dB normal-mode rejection at 60 Hz and enhances common-mode rejection; the differential input is fully floating, and the output common must remain within ±3 V of power common to maintain specification compliance.

Key Specifications

Pinout & Package

5B37-T-15-FC uses the standard 5B Series module package: 2.275″ × 2.375″ × 0.595″ (57.8 mm × 59.1 mm × 15.1 mm), potted epoxy construction, identical pin-out across all 5B modules for hot-swap compatibility.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADAM-4018-T and SCXI-1322, the 5B37-T-15-FC delivers standalone, transformer-isolated, hot-swappable signal conditioning in a compact potted module - ideal for retrofitting into existing 5B backplanes or safety-critical single-channel deployments where galvanic isolation integrity is non-negotiable.

Availability

5B37-T-15-FC is available at Aetrix Electronics and suitable for industrial temperature monitoring, PLC analog input conditioning, and hazardous area sensor interface applications requiring stable component supply, long-lifecycle availability, and FM/CSA certification continuity.

Supply support for 5B37-T-15-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 semiconductor leader specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision measurement and industrial control.

The 5B Series - including the 5B37-T-15-FC - was engineered to deliver cost-effective, transformer-isolated signal conditioning for harsh industrial environments, with emphasis on safety certifications, hot-swap reliability, and out-of-the-box thermocouple accuracy.

FAQ

What thermocouple types does the 5B37-T-15-FC support?

The 5B37-T-15-FC is specifically configured for Type T thermocouples, covering −100°C to +400°C. It does not support J, K, or other types - each 5B37 variant is factory-set for one thermocouple type. The "T" in the part number denotes this fixed calibration, and internal laser trimming ensures accuracy across the full range without user recalibration.

Does the 5B37-T-15-FC require external cold-junction compensation?

No. The 5B37-T-15-FC uses an integrated cold-junction compensation (CJC) sensor - typically the AC1361 mounted on the 5B Series backplane - to automatically correct for terminal temperature effects. This delivers ±0.25°C accuracy at +25°C and eliminates need for external CJC circuitry or manual offset adjustment.

What is the meaning of "15" in the 5B37-T-15-FC part number?

The "15" in 5B37-T-15-FC indicates the model's specific configuration variant within the Type T family - denoting factory-set zero-scale offset and span calibration optimized for standard industrial ranges. It is not a date code or revision; all 5B37-T-15-FC units share identical electrical specs, pinout, and mechanical dimensions per Rev. 0 datasheet.

Can the 5B37-T-15-FC be used with non-5B backplanes?

No - the 5B37-T-15-FC relies on mechanical alignment, power distribution, and cold-junction sensing provided exclusively by Analog Devices' 5B Series backplanes (e.g., 5B30, 5B37-01). Its pinout and mounting footprint are incompatible with third-party carriers or NI SCXI or Advantech ADAM chassis without custom adapter hardware.

How does the 5B37-T-15-FC indicate an open thermocouple fault?

The 5B37-T-15-FC provides upscale open-circuit detection: when the thermocouple loop opens, the output rises above +5 V after ~10 seconds. This fail-safe behavior enables immediate PLC or DAQ alarm triggering. A downscale response can be implemented externally by connecting a 47 MΩ resistor across terminals 1 and 3, but the default is upscale.