Analog Devices Inc. 7B27-T-03-2

Overview

7B27-T-03-2 from Analog Devices is a single-channel isolated thermocouple input signal conditioner for Type T thermocouples, delivering factory-configured 0 V to +10 V isolated output with ±0.01% initial accuracy, ±0.02% nonlinearity, and 3 Hz bandwidth. It operates from +14 VDC to +35 VDC, supports -100°C to +400°C input range, and provides cold junction compensation with ±1.0°C accuracy over +5°C to +45°C ambient.

For engineers reviewing the 7B27-T-03-2 datasheet, 7B27-T-03-2 pinout, 7B27-T-03-2 application, or 7B27-T-03-2 equivalent, key selection criteria include thermocouple type (T), output range (0–10 V), isolation rating (100 V rms), CJC implementation method, and compatibility with 7B Series backplanes (AC1363) requiring screw-terminal field wiring and 25-pin D-sub interface.

Technical Context

The 7B27-T-03-2 implements transformer-based isolation (100 V rms continuous) with amplitude modulation and internal DC/DC conversion to power its isolated front-end. Cold junction compensation uses an embedded thermistor under the input terminal block on compatible 7B backplanes.

Signal conditioning includes a one-pole 3 Hz input filter, low-drift amplifier, voltage reference offsetting, and a two-pole output low-pass filter (-3 dB @ 3 Hz), yielding <1 Ω output impedance and 0.4 mV rms noise (10 Hz–100 kHz). Input protection covers ±30 VDC continuous and meets ANSI/IEEE C37.90.1-1989 transient standards.

Key Specifications

Pinout & Package

7B27-T-03-2 uses the universal 6-pin plug-in module footprint standardized across the 7B Series, designed for insertion into AC1363 19-inch rack backplanes with gold-plated sockets and screw-terminal field connections.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar thermocouple signal conditioning applications.

Compared with 7B27-T-03-1, the 7B27-T-03-2 offers identical thermocouple support and accuracy but delivers 0–10 V scaling for higher resolution in modern DAQ systems; versus ADAM-4018-T, it provides true transformer isolation and mechanical hot-swap-critical for safety-critical industrial control racks.

Availability

7B27-T-03-2 is available at Aetrix Electronics and suitable for industrial temperature monitoring, process control loop interfacing, and thermocouple-based safety shutdown systems requiring stable component supply, long-term lifecycle support, and consistent calibration traceability.

Supply support for 7B27-T-03-2 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 applications.

The 7B Series was engineered specifically for rugged, rack-mounted industrial signal conditioning-delivering isolation, cold-junction compensation, and hot-swap capability in compact plug-in modules for factory-floor and process control environments.

FAQ

What thermocouple types does the 7B27-T-03-2 support?

The 7B27-T-03-2 is specifically configured for Type T thermocouples and supports the -100°C to +400°C input range. While the broader 7B27 family supports J, K, E, R, S, and B types, the 7B27-T-03-2's internal calibration and cold junction compensation are optimized exclusively for Type T. Using it with other thermocouple types will result in significant measurement error.

Does the 7B27-T-03-2 require an external cold junction sensor?

No. The 7B27-T-03-2 relies on the thermistor-based cold junction compensation (CJC) sensor embedded under the input terminal block of compatible 7B Series backplanes (e.g., AC1363). This eliminates the need for external CJC hardware-provided the module is installed in a certified 7B backplane with functioning CJC circuitry.

What is the isolation specification of the 7B27-T-03-2?

The 7B27-T-03-2 provides 100 V rms continuous common-mode voltage isolation between input and output/power circuits. This transformer-based isolation is distinct from reinforced creepage/clearance ratings and is verified per continuous stress testing-not just transient surge rating. It enables safe operation in grounded-field-wiring scenarios typical of industrial plants.

Can the 7B27-T-03-2 be used outside a 7B Series backplane?

No. The 7B27-T-03-2 requires mechanical, electrical, and thermal integration with a 7B Series backplane (e.g., AC1363) to function correctly. Its pinout, power delivery, cold junction sensing, and hot-swap interlock depend on backplane-specific features-including gold-plated sockets, screw terminals, and embedded CJC thermistors. Standalone use is not supported.

What output load can the 7B27-T-03-2 drive reliably?

The 7B27-T-03-2 delivers a 0 V to +10 V output into loads ≥2 kΩ with guaranteed accuracy and noise performance. Its output impedance is <1 Ω, enabling stable operation even with capacitive loads up to 1000 pF. Short-circuit protection is included-continuous output short to ground will not damage the 7B27-T-03-2.