Analog Devices Inc. 5B31-06-DT

Overview

5B31-06-DT from Analog Devices is a single-channel isolated voltage input signal conditioner that accepts ±10 V analog inputs and delivers 0 V to +5 V outputs with ±0.05% span accuracy, 1500 V_rms continuous isolation, and 4 Hz low-pass filtering-used in industrial programmable controllers and data acquisition systems for high-noise environments.

For engineers reviewing the 5B31-06-DT datasheet, 5B31-06-DT pinout, 5B31-06-DT application, or 5B31-06-DT equivalent, key selection factors include its field-side floating differential input, chopper-stabilized amplifier (±20 µV/°C input offset drift), output enable control (active-low), 240 V_rms input protection, and compatibility with FM/CSA Class 1 Division 2 hazardous locations.

Technical Context

The 5B31-06-DT employs transformer-coupled isolation with proprietary modulation for linear signal transfer and integrates a chopper-stabilized input amplifier with laser-trimmed zero-scale subtraction. Its differential field-side input is fully floating and requires no grounding.

Internal multi-pole filtering provides –3 dB cutoff at 4 Hz, delivering 160 dB common-mode rejection at 50/60 Hz for ±10 V span and 60 dB normal-mode rejection. The output stage includes a series switch controlled by an active-low enable input and buffers to 50 Ω output impedance.

Key Specifications

Pinout & Package

Package: 2.275" × 2.375" × 0.595" (57.8 mm × 59.1 mm × 15.1 mm) potted module with standardized 4-pin field-side screw-terminal interface; compatible with 5B-series backplanes and sockets.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar isolated voltage input conditioning applications.

Compared with 5B31-05-DT and ADUM3160BRWZ, the 5B31-06-DT uniquely integrates isolation, amplification, filtering, and protection in one potted module for ±10 V inputs-eliminating design overhead and certification risk associated with discrete alternatives.

Availability

5B31-06-DT is available at Aetrix Electronics and suitable for industrial programmable controllers, hazardous location monitoring panels, and factory-floor data acquisition systems requiring stable component supply, long-term lifecycle support, and certified safety compliance.

Supply support for 5B31-06-DT 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.

The 5B Series was designed specifically for rugged industrial signal conditioning-delivering transformer-isolated, potted, hot-swappable modules that meet FM/CSA hazardous-location standards and EN50082-1 EMC requirements.

FAQ

What is the input impedance of the 5B31-06-DT when powered on?

The 5B31-06-DT has an input resistance of 650 kΩ when powered on. This value is consistent across all 5B31 models and ensures minimal loading on ±10 V field sensors such as industrial transmitters and process monitors. The impedance drops to 650 kΩ when powered off, maintaining predictable behavior during maintenance or hot-swap events. This specification is verified per the Analog Devices 5B30/5B31 Rev. 0 datasheet, Page 4.

Does the 5B31-06-DT require external power supply filtering?

No, the 5B31-06-DT operates from a +5 V ±5% supply and includes internal regulation and noise suppression. Its power supply sensitivity is specified at ±0.4 mV/Vs%, meaning a 1% supply variation introduces less than ±0.02 mV output error-well within its ±0.05% span accuracy. External bulk capacitance is recommended per the 5B Series User Manual but not strictly required for basic operation. The 5B31-06-DT maintains this performance across its full –40°C to +85°C operating range.

Can the 5B31-06-DT be used with thermocouples?

No, the 5B31-06-DT is designed exclusively for millivolt- and voltage-range analog inputs (±1 V to ±20 V); it does not provide cold-junction compensation, sensor excitation, or thermocouple-specific linearization. For thermocouple interfacing, Analog Devices specifies dedicated modules such as the 5B37 series. The 5B31-06-DT's functional block diagram, pinout, and specifications confirm no thermocouple support-its HIGH+ and LOW– terminals accept only voltage signals, not raw thermocouple junctions.

What is the maximum allowable common-mode voltage between input and output grounds for the 5B31-06-DT?

The 5B31-06-DT supports up to 1500 V_rms continuous common-mode voltage between input and output circuits, as confirmed in its isolation rating. However, the output common must remain within ±3 V of the power supply common to ensure proper demodulator operation and output buffer stability. Exceeding this ±3 V limit risks output distortion or latch-up. This constraint is explicitly stated in the "Common-Mode Voltage" section of the datasheet (Page 4) and applies regardless of input common-mode level.

Is the 5B31-06-DT compatible with third-party 5B-series backplanes?

Yes, the 5B31-06-DT is mechanically and electrically compatible with all standard 5B-series backplanes-including those from Analog Devices and licensed manufacturers-due to identical pin-out, dimensions (2.275" × 2.375" × 0.595"), and hot-swap design. It functions correctly with 5B01 and 5B08 backplanes, which provide grounded enable inputs. Compatibility is guaranteed under FM/CSA certifications and confirmed in the "Mix-and-Match" and "Hot Swappable" features sections of the datasheet.