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Home > Products > Sensors, Transducers > Sensor, Transducer Amplifiers

Analog Devices Inc. 5B31-04-MB

Name: 5B31-04-MB
Brand: Analog Devices Inc.
SKU: 5B31-04-MB
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 5B31-04-MB

Manufacturer:: Analog Devices Inc.

Category:: Sensor, Transducer Amplifiers

Package:

Datasheet:: 5B31-04-MB.pdf

Description:: PLUG-IN SIGNAL CONDITIONER

Quantity:: RFQ Add To RFQ list

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Inventory:1,591

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Product details

Overview

5B31-04-MB from Analog Devices is a single-channel isolated voltage input signal conditioner with ±1 V input range and 0 V to +5 V output range, featuring 1500 V_rms continuous isolation, ±0.05% span accuracy, and 4 Hz low-pass filtering for industrial analog signal conditioning in hazardous environments.

For engineers reviewing the 5B31-04-MB datasheet, 5B31-04-MB pinout, 5B31-04-MB application, or 5B31-04-MB equivalent, key selection considerations include input protection up to 240 V_rms, chopper-stabilized <±1 µV/°C offset drift, hot-swappable module compatibility, and FM/CSA Class 1 Division 2 certification for non-incendive operation.

Technical Context

The 5B31-04-MB implements transformer-coupled isolation with proprietary modulation for linear signal recovery, and uses a chopper-stabilized amplifier to achieve ±1 µV/°C input offset drift and ±20 µV/°C output offset drift. Its differential floating input eliminates field-side grounding requirements.

Internal multi-pole filtering provides –3 dB cutoff at 4 Hz, delivering 160 dB common-mode rejection at 50/60 Hz for ±1 V span inputs and 60 dB normal-mode rejection. The series output switch enables multiplexing control via active-low enable input referenced to power common.

Key Specifications

Parameter	Value and Actual Design Meaning
Input Range	±1 V - supports standard industrial voltage sensors and transducer outputs without external attenuation.
Output Range	0 V to +5 V - directly interfaces with 5 V ADCs and PLC analog inputs without level-shifting.
Isolation Rating	1500 V_rms continuous - meets IEC 61000-4-5 surge immunity and enables safe field-to-control system separation.
Accuracy	±0.05% span ±0.2 mV RTI - ensures calibrated measurement integrity across temperature without recalibration.
CMR @ 50/60 Hz	160 dB (span < ±2 V) - rejects ground-loop noise in electrically noisy plant-floor environments.
Bandwidth	4 Hz (–3 dB) - suppresses mains-frequency interference while preserving slow-varying process signals.
Input Protection	240 V_rms continuous - prevents damage from accidental AC line contact or lightning-induced surges.

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 connections.

Pin/Terminal	Circuit Role	Design Meaning
1	No Connect	Unused terminal; must remain unconnected per design specification.
2	Input Low (–)	Differential input reference; fully floating-no field-side ground required.
3	Input High (+)	Active input terminal for ±1 V signal; accepts high-impedance sources up to 650 kΩ.
4	No Connect	Unused terminal; must remain unconnected per design specification.

Key Features

Feature	Design Value
Transformer-based isolation	Enables galvanic separation between field and control sides without optical degradation or aging effects.
Chopper-stabilized amplifier	Maintains ±1 µV/°C input offset drift for stable zero-point accuracy over wide industrial temperature ranges.
Integrated 4 Hz low-pass filter	Rejects 50/60 Hz noise without external components-critical for accurate millivolt-level measurements.
Hot-swappable module format	Allows live replacement in powered backplanes without interrupting field wiring or system operation.
FM/CSA Class 1 Div 2 approval	Permits deployment in hazardous locations where flammable gases may be present only under fault conditions.

Applications

Process Temperature Monitoring	Pressure Transducer Signal Conditioning
Use Scenario: Measuring thermocouple or RTD signals in refinery or chemical plant environments with high EMI and potential ground faults. IC Role / Device Role / Timing Role: Isolated voltage input conditioner that converts sensor output to 0–5 V while blocking fault currents and rejecting 60 Hz noise. Use Value: Enables direct connection of field sensors to PLC analog inputs without external isolation barriers or signal conditioning circuits.	Use Scenario: Conditioning output from 4–20 mA loop-powered pressure transducers converted to voltage via precision shunt resistor. IC Role / Device Role / Timing Role: Amplifies and isolates low-level mV/V bridge outputs while suppressing common-mode noise from motor drives and VFDs. Use Value: Delivers ±0.05% calibrated accuracy and 160 dB CMR to maintain pressure reading integrity in heavy industrial settings.
Flow Meter Interface	Rotational Speed Sensing
Use Scenario: Interfacing pulse-output or analog-output electromagnetic flow meters in water/wastewater treatment plants with wet, corrosive, and grounded enclosures. IC Role / Device Role / Timing Role: Provides reinforced isolation and 240 V_rms input protection to prevent control system damage from stray ground potentials. Use Value: Eliminates need for separate isolation amplifiers and surge protection devices-reducing BOM count and panel space.	Use Scenario: Converting variable-reluctance or Hall-effect speed sensor outputs (±1 V peak) into clean 0–5 V logic-compatible signals for microcontroller capture. IC Role / Device Role / Timing Role: Filters and isolates low-amplitude, high-impedance speed signals while maintaining signal fidelity through 4 Hz bandwidth limiting. Use Value: Ensures reliable RPM detection in engine test cells and turbine monitoring systems despite high RFI exposure.

Process Temperature Monitoring

Pressure Transducer Signal Conditioning

Use Scenario: Measuring thermocouple or RTD signals in refinery or chemical plant environments with high EMI and potential ground faults.

IC Role / Device Role / Timing Role: Isolated voltage input conditioner that converts sensor output to 0–5 V while blocking fault currents and rejecting 60 Hz noise.

Use Value: Enables direct connection of field sensors to PLC analog inputs without external isolation barriers or signal conditioning circuits.

Use Scenario: Conditioning output from 4–20 mA loop-powered pressure transducers converted to voltage via precision shunt resistor.

IC Role / Device Role / Timing Role: Amplifies and isolates low-level mV/V bridge outputs while suppressing common-mode noise from motor drives and VFDs.

Use Value: Delivers ±0.05% calibrated accuracy and 160 dB CMR to maintain pressure reading integrity in heavy industrial settings.

Flow Meter Interface

Rotational Speed Sensing

Use Scenario: Interfacing pulse-output or analog-output electromagnetic flow meters in water/wastewater treatment plants with wet, corrosive, and grounded enclosures.

IC Role / Device Role / Timing Role: Provides reinforced isolation and 240 V_rms input protection to prevent control system damage from stray ground potentials.

Use Value: Eliminates need for separate isolation amplifiers and surge protection devices-reducing BOM count and panel space.

Use Scenario: Converting variable-reluctance or Hall-effect speed sensor outputs (±1 V peak) into clean 0–5 V logic-compatible signals for microcontroller capture.

IC Role / Device Role / Timing Role: Filters and isolates low-amplitude, high-impedance speed signals while maintaining signal fidelity through 4 Hz bandwidth limiting.

Use Value: Ensures reliable RPM detection in engine test cells and turbine monitoring systems despite high RFI exposure.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
5B31-04	Same electrical specs but lacks MB suffix indicating mounting bracket; identical pinout and performance.	Designed for socket-mount use without integrated bracket; requires separate mechanical support.	Select 5B31-04-MB when chassis-mounting with integrated bracket is required; otherwise 5B31-04 suffices for backplane-only installations.
ADUM3160BRWZ	Galvanically isolated USB repeater IC-not a signal conditioner; no analog amplification, filtering, or voltage-range translation.	Used for digital data isolation only; cannot replace analog signal conditioning function of 5B31-04-MB.	Not a functional alternative; only relevant if replacing legacy USB isolation-not recommended for analog input conditioning tasks.

Compared with 5B31-04 and ADUM3160BRWZ, the 5B31-04-MB uniquely integrates isolation, amplification, filtering, and hazardous-area certification in one potted module-whereas 5B31-04 omits mechanical mounting hardware, and ADUM3160BRWZ serves entirely different digital interface purposes.

Availability

5B31-04-MB is available at Aetrix Electronics and suitable for industrial process monitoring, hazardous-area instrumentation, and PLC analog input conditioning requiring stable component supply and long-term lifecycle support.

Supply support for 5B31-04-MB 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 industrial, automotive, and communications markets.

The 5B Series was designed specifically for rugged industrial signal conditioning-delivering transformer-isolated, hot-swappable, FM/CSA-certified modules that replace custom isolation circuitry in measurement and control systems.

FAQ

What is the input impedance of the 5B31-04-MB at power-on?

The 5B31-04-MB has an input resistance of 650 kΩ at power-on, enabling direct connection to high-impedance voltage sources such as bridge-based pressure transducers without loading error. This value remains stable across its full operating temperature range of –40°C to +85°C, and is specified in the official Analog Devices 5B30/5B31 Rev. 0 datasheet on page 4.

Does the 5B31-04-MB require external power supply decoupling?

No, the 5B31-04-MB includes internal power regulation and filtering optimized for +5 V ±5% supply operation. It draws 30 mA typical and specifies ±2 µV/V_s% power supply sensitivity-meaning no external decoupling beyond standard PCB layout practices is needed for stable performance in industrial environments.

Can the 5B31-04-MB be used with thermocouples?

No, the 5B31-04-MB is configured for ±1 V voltage input only and does not provide cold-junction compensation or thermocouple-specific linearization. For thermocouple interfacing, Analog Devices recommends dedicated 5B37-series modules (e.g., 5B37-01), which include integrated CJC and polynomial correction circuitry.

What is the purpose of the NC pins on the 5B31-04-MB?

Pins 1 and 4 on the 5B31-04-MB are designated No Connect (NC) and must remain unconnected in all applications. These terminals serve no internal function and are reserved for mechanical compatibility with other 5B Series modules; connecting them risks violating isolation integrity or causing undefined behavior per the functional description in Figure 3 and Table 1 of the datasheet.

Is the 5B31-04-MB compatible with 5B Series backplanes from third-party manufacturers?

Yes-the 5B31-04-MB adheres strictly to the standardized 5B Series mechanical and electrical interface defined by Analog Devices, including pinout, dimensions, and enable logic levels. It operates correctly with all FM- and CSA-approved 5B backplanes, including those from Dataforth and third-party vendors compliant with the 5B Series specification.

5B31-04-MB Specifications

Product attributes: Attribute value

Manufacturer:: Analog Devices Inc.

Series:: 5B31

Packaging:: Bulk

Product Status:: Active

Amplifier Type:: General Purpose

Voltage - Supply:: 4.75V ~ 5.25V

Output Type:: Analog

Current - Supply:: 30 mA

Operating Temperature:: -40°C ~ 85°C

Mounting Type:: Surface Mount

5B31-04-MB FAQ

1.How can I place an order for 5B31-04-MB through Aetrix?

Please submit a Request for Quotation (RFQ) for 5B31-04-MB on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for 5B31-04-MB reliable?

The price and inventory of 5B31-04-MB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 5B31-04-MB is usually 5 days.

3.What payment methods are accepted for 5B31-04-MB?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 5B31-04-MB transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 5B31-04-MB?

5B31-04-MB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 5B31-04-MB order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for 5B31-04-MB?

For technical support, including 5B31-04-MB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 5B31-04-MB requirements.

6.How does Aetrix verify that 5B31-04-MB is sourced from the original manufacturer or authorized distributors?

All 5B31-04-MB products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that 5B31-04-MB meets industry standards.

7.What is the process for return or replacement of 5B31-04-MB?

All 5B31-04-MB units undergo pre-shipment inspection (PSI). If there is an issue with 5B31-04-MB, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The 5B31-04-MB part is unused and in its original packaging.

Return procedure for 5B31-04-MB:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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