Analog Devices Inc. 5B34-24-FC

Overview

5B34-24-FC from Analog Devices is a single-channel isolated linearized RTD input signal conditioner for 2- and 3-wire platinum, nickel, and copper RTDs. It delivers 0 V to +5 V output, provides ±0.05% span accuracy, 1500 V_rms continuous isolation, and 4 Hz bandwidth with chopper-stabilized amplification. It is used in industrial temperature monitoring systems requiring field-side overvoltage protection up to 240 V_rms.

For engineers reviewing the 5B34-24-FC datasheet, 5B34-24-FC pinout, 5B34-24-FC application, or 5B34-24-FC equivalent, key selection criteria include RTD type support (e.g., 100 Ω Pt α=0.00385), linearization capability across defined temperature ranges, transformer-based isolation integrity, excitation current matching (0.25 mA for Pt/Ni), and compatibility with 5B-series backplanes.

Technical Context

The 5B34-24-FC implements transformer-coupled signal isolation with proprietary modulation for stable linear transfer. Its differential chopper-stabilized input amplifier achieves ±0.02°C/°C input offset drift and ±20 µV/°C output offset drift, enabling high-accuracy low-drift RTD measurement without self-heating artifacts.

It integrates dual matched current sources (0.25 mA for 100 Ω Pt/120 Ω Ni; 1.0 mA for 10 Ω Cu), laser-trimmed feedback linearization, and multi-pole low-pass filtering with 4 Hz –3 dB cutoff. Lead resistance cancellation is supported for 3-wire RTDs via second excitation path through the third lead and a precision laser-trimmed reference resistor.

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 ISO124, the 5B34-24-FC delivers turnkey RTD conditioning with certified isolation, factory-laser linearization, and mechanical interoperability across 5B-series backplanes-eliminating system-level design effort while meeting stringent industrial safety and EMC standards.

Availability

5B34-24-FC is available at Aetrix Electronics and suitable for industrial temperature monitoring, process control loop input, and hazardous location sensing requiring stable component supply and long-term lifecycle support.

Supply support for 5B34-24-FC 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 specifically for rugged industrial signal conditioning-delivering transformer-isolated, linearized, and filtered analog interfaces for RTDs, thermocouples, and voltage/current sensors in harsh electromagnetic and thermal environments.

FAQ

What RTD types and temperature ranges does the 5B34-24-FC support?

The 5B34-24-FC supports 100 Ω platinum (α = 0.00385), 120 Ω nickel (α = 0.00672), and 10 Ω copper (α = 0.004274) RTDs. Standard ranges include –100°C to +100°C, 0°C to +600°C (Pt), –80°C to +320°C (Ni), and –100°C to +260°C (Cu). Custom ranges are available per configuration guide. The 5B34-24-FC uses laser-trimmed linearization to maintain accuracy across each specified range.

Does the 5B34-24-FC require external power supply filtering or grounding?

No-the 5B34-24-FC incorporates internal multi-pole filtering and operates from a +5 V ±5% supply drawing 30 mA. Its fully floating differential input eliminates need for input grounding, and output common must be kept within ±3 V of power common. Field-side screw terminals accept direct RTD wiring without external protection components. The 5B34-24-FC meets EN50082-1 immunity requirements without added filtering.

Can the 5B34-24-FC be used with 4-wire RTDs?

No-the 5B34-24-FC is designed for 2- and 3-wire RTDs only. True 4-wire RTD measurement, which eliminates lead resistance error entirely, is provided by the 5B35 model. Using a 4-wire RTD with the 5B34-24-FC would result in uncorrected lead resistance contribution and degraded accuracy. Always match RTD wiring configuration to the designated module: 5B34-24-FC for 2-/3-wire, 5B35 for 4-wire.

How does the 5B34-24-FC achieve lead resistance cancellation for 3-wire RTDs?

The 5B34-24-FC uses two identical excitation current sources: one drives the HI terminal, the other flows through the third RTD lead and a laser-trimmed precision resistor equal to the RTD's base resistance. This balances lead resistance voltage drops, causing them to cancel at the differential amplifier input. The 5B34-24-FC achieves ±0.02°C/Ω rejection for Pt/Ni RTDs-verified in specification tables and functional block diagrams.

Is the 5B34-24-FC hot-swappable and mix-and-match compatible with other 5B modules?

Yes-the 5B34-24-FC is fully hot-swappable and mix-and-match compatible with all other 5B Series modules. It shares identical mechanical dimensions (2.275" × 2.375" × 0.595"), pin-out, and backplane interface. Modules can be inserted or removed under power without disturbing field wiring or system operation. This interoperability is confirmed in the product overview and general description sections of the 5B34-24-FC documentation.