Analog Devices Inc. 5B35-04-NI

Overview

5B35-04-NI from Analog Devices is a single-channel, isolated, linearized 4-wire RTD input signal conditioner for platinum RTDs (α = 0.00385), supporting 0°C to +600°C range with ±0.78°C accuracy, 0–5 V output, 1500 V_rms input-output isolation, and 4 Hz bandwidth. It delivers precision temperature measurement in hazardous industrial environments requiring nonincendive operation.

For engineers reviewing the 5B35-04-NI datasheet, 5B35-04-NI pinout, 5B35-04-NI application, or 5B35-04-NI equivalent, key selection criteria include its four-wire RTD excitation (0.25 mA), true three-port isolation, chopper-stabilized amplifier (+0.01°C/°C offset drift), 190 dB CMR (180 dB for Model -04), and FM/CSA Class 1 Division 2 certification.

Technical Context

The 5B35-04-NI implements transformer-coupled, three-port isolation (input/output/power) with proprietary modulation/demodulation for linear signal recovery. Its differential input eliminates field-side grounding needs, while a low-drift chopper-stabilized amplifier enables high-accuracy RTD measurement with minimal self-heating error.

It integrates a five-pole Butterworth filter (4 Hz –3 dB bandwidth), delivering 116 dB normal-mode rejection at 60 Hz and 108 dB at 50 Hz. Input protection withstands 240 V_rms continuously, and the series output switch supports active-low enable control with 6 µs selection time.

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 connections.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADAM-4019+ and ISO5852S, the 5B35-04-NI provides a fully integrated, certified, hot-swappable module with built-in excitation, linearization, filtering, and three-port isolation - eliminating external components and qualification effort required for field-deployable industrial systems.

Availability

5B35-04-NI is available at Aetrix Electronics and suitable for industrial temperature monitoring, hazardous area process control, and high-accuracy furnace calibration requiring stable component supply and long-term lifecycle support.

Supply support for 5B35-04-NI 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 was designed specifically for rugged industrial signal conditioning - delivering transformer-isolated, plug-in modules that meet FM/CSA Class 1 Div 2 and EN50082-1/EN50081-2 standards without custom engineering.

FAQ

What is the RTD type and temperature range supported by the 5B35-04-NI?

The 5B35-04-NI is configured for 100 Ω platinum RTDs with α = 0.00385 and supports a linearized input range of 0°C to +600°C. It delivers a corresponding 0–5 V output with ±0.78°C total accuracy. The "NI" suffix denotes nonincendive certification per FM/CSA Class 1 Division 2 requirements, confirming suitability for hazardous locations where flammable gases may be present only under fault conditions.

Does the 5B35-04-NI require external excitation or linearization circuitry?

No, the 5B35-04-NI includes an integrated 0.25 mA precision current source for RTD excitation and full hardware-based linearization. Its chopper-stabilized amplifier and calibrated analog signal path eliminate the need for external op-amps, ADCs, or microcontroller-based compensation algorithms. This makes the 5B35-04-NI a complete, drop-in signal conditioning solution - unlike discrete isolators such as ISO5852S which require external circuitry.

What isolation ratings apply to the 5B35-04-NI, and how are they implemented?

The 5B35-04-NI provides true three-port isolation: 1500 V_rms between input and output, 1500 V_rms between input and power, and 250 V_rms between output and power. This is achieved via transformer coupling with proprietary modulation, not optocouplers. The isolation architecture eliminates ground loops and enables floating field-side inputs - a key requirement for accurate 4-wire RTD measurements in electrically noisy industrial environments.

Can the 5B35-04-NI be used with other 5B Series modules on the same backplane?

Yes, the 5B35-04-NI is fully mix-and-match and hot-swappable with all standard 5B Series modules (e.g., 5B30 thermocouple, 5B40 voltage, 5B08 current input). All modules share identical mechanical dimensions (2.275" × 2.375" × 0.595"), pinout, and mounting interface. No PCB redesign or wiring changes are needed when substituting or adding modules - a core design advantage of the 5B platform.

What certifications does the 5B35-04-NI hold for industrial use?

The 5B35-04-NI is certified by Factory Mutual (FM) and the Canadian Standards Association (CSA) for Class 1, Division 2, Groups A, B, C, and D - confirming its nonincendive operation in hazardous locations. It also complies with EN50082-1 (immunity) and EN50081-2 (emissions) for electromagnetic compatibility in heavy industrial settings. These certifications are integral to the 5B35-04-NI's qualification - not optional add-ons - and are validated per the module's potted construction and isolation architecture.