Analog Devices Inc. 5B35-05

Overview

5B35-05 from Analog Devices is a single-channel, isolated, linearized 4-wire RTD input signal conditioner with -100°C to +200°C input range, 0 V to +5 V output, ±0.60°C accuracy, 4 Hz bandwidth, and 1500 V_rms input-to-output isolation. It performs excitation, amplification, filtering, and isolation for platinum RTDs in industrial temperature monitoring systems.

For engineers reviewing the 5B35-05 datasheet, 5B35-05 pinout, 5B35-05 application, or 5B35-05 equivalent, key selection factors include its four-wire RTD linearization accuracy, true three-port isolation rating, 240 V_rms input terminal withstand, chopper-stabilized low-drift amplification, and hot-swappable 5B Series compatibility.

Technical Context

The 5B35-05 uses a precision 0.25 mA current source for 100 Ω Pt (α = 0.00385) excitation, with separate sense leads eliminating lead resistance error. Its chopper-stabilized differential amplifier delivers ±0.01°C/°C input offset drift and ±30 ppm/°C gain drift.

True three-port isolation separates field-side input, system-side output, and power domains-rated at 1500 V_rms (input–output and input–power) and 250 V_rms (output–power). A five-pole Butterworth filter provides 116 dB normal-mode rejection at 60 Hz and limits output noise to 100 µV_rms (100 kHz BW).

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 5B35-05 delivers factory-calibrated linearized analog output with integrated excitation and certified hazardous-area approval-requiring no software configuration or external components for immediate deployment in industrial control cabinets.

Availability

5B35-05 is available at Aetrix Electronics and suitable for industrial temperature monitoring, hazardous area process control, and PLC analog input conditioning requiring stable component supply, long-term lifecycle support, and certified safety compliance.

Supply support for 5B35-05 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 as a family of rugged, plug-in signal conditioners for industrial measurement and control-delivering transformer-isolated, linearized analog outputs with FM/CSA certification and hot-swap capability in compact potted modules.

FAQ

What is the input RTD type and alpha coefficient supported by the 5B35-05?

The 5B35-05 is configured for 100 Ω platinum RTDs with temperature coefficient α = 0.00385. It uses a 0.25 mA precision excitation current and hardware linearization optimized specifically for this RTD type across the -100°C to +200°C range. The 5B35-05 does not support copper or nickel RTDs-those require other models like 5B35-C-01 or 5B35-N-01.

Does the 5B35-05 require external power supply filtering or decoupling?

No, the 5B35-05 operates from a +5 V dc ±5% supply and includes internal regulation and filtering. Its specified power supply sensitivity is ±0.2°C/% of Vs, and it draws only 15 mA. External bulk capacitance is unnecessary unless shared with noisy digital circuits; the module itself meets EN50082-1 EMC immunity requirements up to 10 V/m at 1 GHz.

Can the 5B35-05 be used with 3-wire or 2-wire RTDs?

No-the 5B35-05 is strictly a 4-wire RTD input module. Its pinout (HI, LO, +EXC, -EXC) and internal architecture assume Kelvin sensing with separate excitation and sense paths. Using it with 3-wire or 2-wire RTDs introduces uncorrected lead resistance errors and violates its calibration. For 3-wire applications, consider the 5B34 series instead.

What is the maximum allowable lead resistance for accurate operation of the 5B35-05?

The 5B35-05 exhibits ±0.00001°C/Ω lead resistance effect for 100 Ω Pt RTDs. This means 100 Ω of total lead resistance contributes only ±0.001°C error-well within its ±0.60°C total accuracy spec. Practically, lead resistances up to several kΩ introduce negligible error, making it suitable for installations with long sensor cable runs without recalibration.

Is the 5B35-05 compatible with all 5B Series backplanes and mounting sockets?

Yes-the 5B35-05 shares identical mechanical dimensions (2.275" × 2.375" × 0.595"), pinout, and electrical interface with all standard 5B Series modules. It is fully hot-swappable on any 5B backplane-including those with cold-junction compensation for thermocouples-and requires no configuration jumpers or DIP switches for operation.