Analog Devices Inc. 5B37-E-04

Overview

5B37-E-04 from Analog Devices is a single-channel isolated thermocouple input signal conditioner for Type E thermocouples (0°C to +900°C), delivering a precision 0 V to +5 V isolated output with ±0.05% span accuracy, 1500 V_rms continuous isolation, and integrated cold-junction compensation. It is used in industrial temperature monitoring systems requiring field-side protection and system-level noise immunity.

For engineers reviewing the 5B37-E-04 datasheet, 5B37-E-04 pinout, 5B37-E-04 application, or 5B37-E-04 equivalent, key selection criteria include thermocouple type support, open-circuit detection behavior, chopper-stabilized amplifier drift (±1 µV/°C), 4 Hz low-pass filter cutoff, and compliance with FM Class 1 Div 2 and CSA hazardous location standards.

Technical Context

The 5B37-E-04 implements transformer-based galvanic isolation with proprietary modulation for linear signal recovery, featuring a fully floating differential input stage eliminating input grounding requirements. Its chopper-stabilized amplifier ensures low-drift gain and laser-trimmed zero-scale offset subtraction for expanded-scale measurement capability.

Internal multi-pole filtering provides 60 dB normal-mode rejection at 60 Hz and enhances common-mode rejection to 160 dB with 1 kΩ source imbalance. Cold-junction compensation uses an on-board sensor (e.g., AC1361) for ±0.25°C initial accuracy at +25°C, with open-thermocouple detection generating an upscale output unless a 47 MΩ resistor is installed across terminals 1 and 3.

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-T and SCXI-1125, the 5B37-E-04 delivers certified hazardous-area operation, true hot-swap capability without firmware or driver dependencies, and superior low-frequency noise rejection via its fixed 4 Hz filter-making it optimal for standalone, safety-critical industrial signal conditioning.

Availability

5B37-E-04 is available at Aetrix Electronics and suitable for industrial temperature monitoring, hazardous location control, and programmable controller I/O applications requiring stable component supply, long-lifecycle support, and certified safety compliance.

Supply support for 5B37-E-04 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 designed specifically for rugged industrial signal conditioning-delivering transformer-isolated, hot-swappable, FM- and CSA-certified modules that replace custom-built isolation solutions in process control and factory automation.

FAQ

What thermocouple types does the 5B37-E-04 support?

The 5B37-E-04 is specifically configured for Type E thermocouples with an input range of 0°C to +900°C. While the broader 5B37 family supports J, K, T, R, S, B, N, and C types, the 5B37-E-04 model is factory-set for Type E only. Its internal calibration, cold-junction compensation, and scaling are optimized exclusively for Type E characteristics and cannot be reconfigured in the field.

Does the 5B37-E-04 require an external cold-junction sensor?

No, the 5B37-E-04 does not require an external cold-junction sensor when used with standard 5B Series backplanes (e.g., 5B37-E-04 mounts directly onto backplanes containing the AC1361 CJC sensor). The module leverages the backplane's built-in sensor for ±0.25°C initial CJC accuracy. Standalone use without a compatible backplane would necessitate external CJC implementation.

How does open thermocouple detection work on the 5B37-E-04?

The 5B37-E-04 generates an upscale output (≥+5 V) within 10 seconds of detecting an open thermocouple circuit. This behavior is automatic and requires no configuration. To instead produce a downscale response (≤0 V), a 47 MΩ, 0.25 W resistor must be externally connected across screw terminals 1 (–EXC) and 3 (HI), as specified in the functional description on page 2 of the datasheet.

What is the maximum continuous input voltage the 5B37-E-04 can withstand?

The 5B37-E-04 is rated to withstand 240 V_rms continuously at its input screw terminals without damage or performance degradation. This rating applies to both field-side overvoltage protection and transient surge suppression per ANSI/IEEE C37.90.1-1989, shielding downstream data acquisition or control circuitry from industrial fault conditions.

Is the 5B37-E-04 compatible with non-Analog Devices backplanes?

The 5B37-E-04 is mechanically and electrically compatible only with official 5B Series backplanes (e.g., 5B37-E-04 mates with 5B01, 5B08, or 5B37-compatible sockets) due to its standardized pinout, size, and power interface. Use with third-party carriers may compromise isolation integrity, CJC functionality, or hot-swap reliability-and voids FM/CSA certifications.