Analog Devices Inc. 5B34-N-01-NI

Overview

5B34-N-01-NI from Analog Devices is a single-channel isolated linearized RTD input signal conditioner for 120Ω nickel RTDs (α = 0.00672), delivering 0 V to +5 V output over 0°C to +300°C range with ±0.40°C accuracy, 4 Hz bandwidth, and 1500 V_rms continuous isolation - used in industrial temperature monitoring systems requiring field-side fault protection and lead-resistance compensation.

For engineers reviewing the 5B34-N-01-NI datasheet, 5B34-N-01-NI pinout, 5B34-N-01-NI application, or 5B34-N-01-NI equivalent, key selection criteria include RTD type compatibility (120Ω Ni), linearization accuracy across extended range, 240 V_rms input terminal withstand, hot-swap capability in 5B backplanes, and compliance with FM/CSA Class 1 Div 2 hazardous location standards.

Technical Context

The 5B34-N-01-NI implements transformer-based galvanic isolation with proprietary modulation for stable linear signal transfer, paired with chopper-stabilized differential amplification achieving ±20 µV/°C output offset drift and ±0.005% of reading/°C gain drift. It uses dual matched current sources (0.25 mA) for 120Ω Ni RTD excitation and lead-resistance cancellation in 3-wire configurations.

Its internal multi-pole low-pass filter provides 4 Hz –3 dB cutoff, delivering 160 dB common-mode rejection at 50/60 Hz with 1 kΩ source imbalance and 60 dB normal-mode rejection - enabling high-fidelity measurement in electrically noisy industrial environments without external filtering.

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 isolated RTD input conditioning applications.

Compared with 5B34-N-01 and 5B34-04, the 5B34-N-01-NI uniquely guarantees nickel-specific laser trimming, documented traceability for regulated industries, and validated performance across the full 0°C–300°C nickel RTD range - making it the sole compliant choice where material certification and α=0.00672 linearization are mandatory.

Availability

5B34-N-01-NI is available at Aetrix Electronics and suitable for industrial temperature monitoring, process control loop input, hazardous area sensor interface, and legacy system retrofit requiring stable component supply, long-term lifecycle support, and certified hazardous-location approvals.

Supply support for 5B34-N-01-NI 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 engineered specifically for rugged industrial signal conditioning - integrating transformer isolation, RTD linearization, EMI-hardened filtering, and hot-swap readiness into compact, certified modules for hazardous and high-noise environments.

FAQ

What RTD types does the 5B34-N-01-NI support?

The 5B34-N-01-NI is factory-calibrated exclusively for 120Ω nickel RTDs with temperature coefficient α = 0.00672. It is not configured for platinum (Pt) or copper (Cu) RTDs. Attempting to use other RTD types will result in significant linearization error outside the ±0.40°C specification. The module's laser-trimmed feedback network and excitation current (0.25 mA) are optimized for nickel's resistance-vs-temperature curve across 0°C to +300°C.

Does the 5B34-N-01-NI require external power supply regulation?

No - the 5B34-N-01-NI operates from a nominal +5 V dc supply with ±5% tolerance (4.75 V to 5.25 V). Its internal regulation handles supply sensitivity of only ±0.05°C/V for nickel RTDs, meaning typical unregulated 5 V rails from industrial backplanes or switching supplies meet specification without added filtering or regulation. Power supply current draw is 30 mA maximum.

Can the 5B34-N-01-NI be used in 2-wire, 3-wire, and 4-wire RTD configurations?

The 5B34-N-01-NI supports 2-wire and 3-wire RTD connections via pins HI, LO, and RETURN. It does not support true 4-wire (Kelvin) measurement - that function is provided by the 5B35 model. In 3-wire mode, the RETURN pin enables lead-resistance cancellation, limiting error to ±0.02°C/Ω. For 2-wire use, RETURN is left unconnected, accepting higher lead-error contribution.

What safety certifications apply to the 5B34-N-01-NI?

The 5B34-N-01-NI carries Factory Mutual (FM) and Canadian Standards Association (CSA) approvals for Class 1, Division 2, Groups A, B, C, and D - certifying non-incendive operation in hazardous locations where flammable gases may exist only under fault conditions. It also meets EN50082-1 and EN50081-2 for electromagnetic compatibility in heavy industrial environments.

How is the 5B34-N-01-NI protected against field-side overvoltage?

The 5B34-N-01-NI withstands 240 V_rms continuously at its input screw terminals without damage, protecting downstream control electronics. Its input circuitry includes transient protection compliant with ANSI/IEEE C37.90.1-1989, and the fully floating differential input eliminates need for input grounding - preventing ground-loop currents and enhancing surge resilience in ungrounded field installations.