Analog Devices Inc. 5B35-02

Overview

5B35-02 from Analog Devices is a single-channel, isolated, linearized 4-wire RTD input signal conditioner for industrial temperature measurement. It accepts 0°C to +100°C input range (100 Ω Pt, α = 0.00385), delivers 0 V to +5 V output with ±0.13°C accuracy, and provides 1500 V_rms input-to-output isolation. Used in programmable controllers and data acquisition systems requiring high-accuracy, noise-immune analog conditioning.

For engineers reviewing the 5B35-02 datasheet, 5B35-02 pinout, 5B35-02 application, or 5B35-02 equivalent, key selection factors include its 4 Hz bandwidth, 0.25 mA RTD excitation current, true three-port isolation, low 0.01°C/°C input offset drift, and compatibility with 5B Series hot-swap backplanes.

Technical Context

The 5B35-02 implements chopper-stabilized differential amplification with precision current-source excitation for 4-wire RTDs, eliminating lead resistance error. Its five-pole Butterworth filter achieves 116 dB normal-mode rejection at 60 Hz and supports ≤0.3 mV_p-p output noise in 100 kHz bandwidth.

True three-port isolation separates input, output, and power domains: 1500 V_rms between input–output and input–power, and 250 V_rms between power–output. The module includes active-low enable-controlled series output switch and withstands 240 V_rms continuous overvoltage at field terminals.

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-4017+ and ISO5852S, the 5B35-02 delivers plug-and-play 4-wire RTD conditioning with certified isolation, factory linearization, and backplane compatibility-reducing system integration risk and validation effort for industrial analog I/O.

Availability

5B35-02 is available at Aetrix Electronics and suitable for industrial programmable controllers, data acquisition systems, and analog recorders requiring stable component supply, long-lifecycle support, and FM/CSA-certified hazardous-area operation.

Supply support for 5B35-02 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 industrial, automotive, and communications markets.

The 5B Series was designed specifically for rugged industrial signal conditioning-delivering transformer-isolated, linearized, and protected analog I/O in standardized, hot-swappable modules for PLC, DCS, and data acquisition systems.

FAQ

What is the input RTD type and temperature range supported by the 5B35-02?

The 5B35-02 is configured for 100 Ω platinum RTDs with temperature coefficient α = 0.00385 and supports an input range of 0°C to +100°C. It delivers a linearized 0 V to +5 V output corresponding to that span. This specific calibration is factory-set and cannot be reconfigured in-circuit. The 5B35-02 does not support other RTD types or ranges without hardware modification or replacement with another model in the 5B35 family.

Does the 5B35-02 require external power supply filtering or regulation?

The 5B35-02 operates from a nominal +5 V dc supply with ±5% tolerance and draws 15 mA. Its internal regulation and filtering accommodate typical industrial power rail noise; no external filtering is required for compliance with EN50082-1. However, Analog Devices specifies ±0.2°C/% supply sensitivity, so maintaining supply stability within ±2.5% improves accuracy. The 5B35-02 is designed to function reliably on standard 5B Series backplane power rails without added components.

How does the 5B35-02 achieve true three-port isolation?

The 5B35-02 achieves true three-port isolation through independent transformer coupling between input–output and input–power domains, plus optical or capacitive decoupling for power–output separation. This architecture ensures 1500 V_rms isolation between input and both output and power, and 250 V_rms between power and output. The design eliminates shared reference paths, enabling fully floating field-side inputs and preventing ground-loop currents-critical for accurate 4-wire RTD measurements in electrically noisy plants.

Can the 5B35-02 be used with 2-wire or 3-wire RTDs?

No, the 5B35-02 is strictly a 4-wire RTD input module. Its pinout (–EXC, LO, HI, +EXC) and internal circuitry assume separate excitation and sensing paths to eliminate lead resistance error. Using it with 2-wire or 3-wire RTDs would introduce significant measurement inaccuracy due to uncompensated lead resistance. For 3-wire applications, Analog Devices offers the 5B34 series; for 2-wire, the 5B33 series. Each requires matching model selection and backplane compatibility verification.

What safety certifications apply to the 5B35-02?

The 5B35-02 carries Factory Mutual (FM) approval for Class 1, Division 2, Groups A, B, C, and D hazardous locations, and CSA certification for the same classification. These approvals confirm nonincendive operation-meaning the module cannot ignite flammable gases under normal or single-fault conditions. It also meets EN50082-1 and EN50081-2 for electromagnetic compatibility in heavy industrial environments. Certification documentation is included with original packaging and available via Analog Devices' product support portal for the 5B35-02.