Analog Devices Inc. 5B35-01

Overview

5B35-01 from Analog Devices is a single-channel isolated linearized 4-wire RTD input signal conditioner for platinum 100 Ω (α = 0.00385) sensors, delivering 0 V to +5 V output with ±0.26°C accuracy across –100°C to +100°C, 4 Hz bandwidth, and 1500 V_rms input-to-output isolation-used in industrial temperature monitoring systems requiring high linearity and field-side fault protection.

For engineers reviewing the 5B35-01 datasheet, 5B35-01 pinout, 5B35-01 application, or 5B35-01 equivalent, key selection considerations include its four-wire RTD excitation current (0.25 mA), lead resistance immunity (±0.00001°C/Ω), chopper-stabilized amplifier drift (+0.01°C/°C), and hot-swappable 2.27″ × 2.32″ module form factor compatible with 5B Series backplanes.

Technical Context

The 5B35-01 implements true three-port isolation (input/output/power) using transformer coupling with proprietary modulation/demodulation, enabling floating differential input without field-side grounding. Its precision 0.25 mA RTD excitation source and low-drift differential amplifier eliminate self-heating error and lead-wire resistance effects in 4-wire configurations.

Signal conditioning includes a five-pole Butterworth filter (4 Hz –3 dB bandwidth), delivering 116 dB normal-mode rejection at 60 Hz and output noise of 100 µV_rms (100 kHz BW). Input protection withstands 240 V_rms continuously, and the series output switch enables external logic control via active-low enable input.

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+, the 5B35-01 offers superior noise immunity (116 dB NMR vs. ~80 dB), deterministic 4 Hz bandwidth for stable control loops, and seamless mechanical/electrical compatibility with existing 5B backplanes-whereas ISO5852S serves a fundamentally different output-driving role and lacks RTD interface capability.

Availability

5B35-01 is available at Aetrix Electronics and suitable for industrial temperature monitoring, process control loop input, hazardous location signal conditioning, and data acquisition front-end applications requiring stable component supply, long-term lifecycle support, and factory-certified isolation performance.

Supply support for 5B35-01 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 precision measurement and industrial control.

The 5B Series was designed specifically for rugged industrial signal conditioning-delivering transformer-isolated, linearized, and protected analog I/O in compact, hot-swappable modules compliant with FM, CSA, and EN EMC standards.

FAQ

What is the exact RTD type and alpha coefficient supported by the 5B35-01?

The 5B35-01 is configured for 100 Ω platinum RTDs with temperature coefficient α = 0.00385, covering the –100°C to +100°C range. It uses a precision 0.25 mA excitation current and internal linearization to deliver 0 V to +5 V output. This specific calibration is fixed per model number; the 5B35-01 does not support other RTD types or alpha values without hardware modification or custom configuration.

Does the 5B35-01 require external power supply filtering or decoupling?

No, the 5B35-01 operates from a +5 V dc ±5% supply drawing 15 mA and includes internal regulation and filtering. Its design assumes clean 5 V rail from a 5B Series backplane; no external capacitors or ferrites are required. Power supply sensitivity is specified at ±0.2°C/% of Vs, confirming robustness against typical rail variations encountered in industrial backplane environments.

Can the 5B35-01 be used with 3-wire or 2-wire RTD configurations?

No-the 5B35-01 is strictly a 4-wire RTD input module. Its pinout (–EXC, LO, HI, +EXC) and internal circuitry assume separate excitation and sense paths. Using it with 3-wire or 2-wire RTDs introduces uncorrected lead resistance errors and violates the specified accuracy of ±0.26°C. For 3-wire applications, Analog Devices offers the 5B34 series; 2-wire use is not supported.

What is the purpose of the Enable input on the 5B35-01, and how is it connected?

The 5B35-01 features an active-low Enable input controlling its series output switch. When asserted (logic low ≤ +0.8 V), the 0–5 V output is enabled; when deasserted (≥ +2.4 V), output is disabled (high-impedance). On standard 5B01/5B08 backplanes, this pin is internally grounded-so no external connection is needed unless dynamic output gating is required in custom systems.

How does the 5B35-01 achieve its ±0.26°C accuracy specification?

The ±0.26°C accuracy of the 5B35-01 combines initial calibration error, conformity error (±0.05% span), input offset drift (+0.01°C/°C), and gain drift (+0.003% of reading/°C) over –100°C to +100°C. It relies on chopper-stabilized amplification, precision 0.25 mA excitation, and factory calibration traceable to NIST standards-all verified per Analog Devices' Rev. 0 datasheet testing protocol.