Analog Devices Inc. 5B35-04

Overview

5B35-04 from Analog Devices is a single-channel, isolated, linearized 4-wire RTD input signal conditioner for industrial temperature measurement. It accepts 0°C to +600°C input range (100 Ω Pt, α = 0.00385), delivers 0 V to +5 V output, achieves ±0.78°C accuracy at +25°C, and withstands 240 V rms continuous overvoltage at field terminals. It is used in hazardous-area Class 1, Div 2 monitoring systems requiring high common-mode rejection and true three-port isolation.

For engineers reviewing the 5B35-04 datasheet, 5B35-04 pinout, 5B35-04 application, or 5B35-04 equivalent, key selection criteria include its 4 Hz bandwidth, 190 dB CMR (180 dB for 5B35-04), 1500 V rms input-to-output isolation, 0.25 mA RTD excitation current, and hot-swappable 5B-series mechanical compatibility.

Technical Context

The 5B35-04 implements chopper-stabilized differential amplification with precision current-source excitation for 4-wire RTDs, eliminating lead resistance error via separate excitation and sense paths. Its transformer-coupled isolation provides true three-port separation (input/output/power) with 1500 V rms input-to-output and input-to-power ratings.

It features 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. Output noise is 100 µV rms (100 kHz BW) and 6 mV p-p (5 MHz BW), with output enable control supporting active-low switching and 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 interface.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 5B35-03 and 5B35-05, the 5B35-04 uniquely supports 600°C upper limit with factory-trimmed linearization - critical for metallurgical and glass manufacturing where temperature fidelity above 400°C determines product quality and safety compliance.

Availability

5B35-04 is available at Aetrix Electronics and suitable for industrial furnace monitoring, hazardous-area temperature control, and motor winding thermal protection requiring stable component supply and long-term lifecycle support.

Supply support for 5B35-04 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 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, plug-in industrial signal conditioning - delivering transformer-isolated, linearized, and protected analog I/O in compact, hot-swappable modules for hazardous and high-noise environments.

FAQ

What is the maximum operating temperature range supported by the 5B35-04?

The 5B35-04 supports an input temperature range of 0°C to +600°C using a 100 Ω platinum RTD (α = 0.00385). Its rated performance is specified from –40°C to +85°C ambient, and it maintains ±0.78°C accuracy at +25°C. The module's internal circuitry is thermally designed to sustain continuous operation within this full ambient range without derating.

Does the 5B35-04 require external linearization circuitry or software compensation?

No. The 5B35-04 performs full hardware-based linearization internally using precision analog circuitry and factory calibration. It outputs a highly accurate 0 V to +5 V signal directly proportional to temperature across its 0°C to +600°C range - eliminating the need for external lookup tables, polynomial correction, or microcontroller-based compensation routines in the host system.

What isolation ratings apply to the 5B35-04, and are they certified for hazardous locations?

The 5B35-04 provides 1500 V rms isolation between input and output, and input and power; and 250 V rms between power and output. It 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 suitability for hazardous locations where flammable gases may be present only under fault conditions.

Can the 5B35-04 be used with RTDs other than 100 Ω platinum?

The 5B35-04 is specifically configured for 100 Ω platinum RTDs with α = 0.00385 and 0°C to +600°C range. While the broader 5B35 family includes models for copper and nickel RTDs (e.g., 5B35-C-01, 5B35-N-01), the 5B35-04's calibration, excitation current (0.25 mA), and linearization algorithm are fixed for Pt100 - using it with other RTD types will result in significant measurement error.

How does the 5B35-04 handle electromagnetic interference in industrial settings?

The 5B35-04 combats EMI via multiple integrated mechanisms: a five-pole Butterworth filter (4 Hz –3 dB bandwidth), 180 dB common-mode rejection at 50/60 Hz, 116 dB normal-mode rejection at 60 Hz, and transformer-based isolation. Tested per EN50082-1/EN50081-2, it exhibits <0.1% FS error under 10 V/m RF fields up to 1 GHz - making it robust in VFD-rich and switchgear-dense plant environments.