Analog Devices Inc. 7B27-K-02-1

Overview

7B27-K-02-1 from Analog Devices is a single-channel isolated thermocouple input signal conditioner for Type K thermocouples, delivering factory-configured +1 V to +5 V output linear with temperature over −100°C to +1350°C, featuring 100 V_rms input-to-output isolation, ±0.01% initial accuracy, and integrated cold junction compensation. It operates from +14 VDC to +35 VDC and is designed for industrial process control systems requiring high noise immunity and field wiring protection.

For engineers reviewing the 7B27-K-02-1 datasheet, 7B27-K-02-1 pinout, 7B27-K-02-1 application, or 7B27-K-02-1 equivalent, key selection considerations include its thermocouple type specificity (Type K), output range (+1 V to +5 V), isolation rating (100 V_rms), bandwidth (3 Hz), and compatibility with 7B Series backplanes (AC1363) using universal 6-pin screw-terminal interface.

Technical Context

The 7B27-K-02-1 implements transformer-based amplitude modulation for input-to-output isolation and uses a thermistor-based cold junction compensation sensor embedded in the 7B Series backplane. Its front-end includes a one-pole 3 Hz filter and low-drift amplifier, followed by DC/DC conversion for isolated power and a two-pole output low-pass filter (−3 dB @ 3 Hz).

It supports hot-swap insertion into any 7B Series backplane socket without disrupting field wiring or system power. Input protection covers ±30 VDC continuous and meets ANSI/IEEE C37.90.1-1989, IEC 255-4 Class II transient standards, while common-mode rejection exceeds 160 dB at 50/60 Hz.

Key Specifications

Pinout & Package

7B27-K-02-1 uses a 6-pin universal screw-terminal interface compatible with all 7B Series backplanes (e.g., AC1363). Dimensions: 42.24 mm × 53.6 mm × 14.3 mm (1.663″ × 2.11″ × 0.563″). No surface-mount or DIP package - module is board-mounted via backplane socket.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADAM-4018-BE and OM5-LTC, the 7B27-K-02-1 delivers superior channel-level isolation integrity, guaranteed CJC performance across industrial ambient ranges, and deterministic fault signaling - critical for safety-critical process loops where module-level reliability and field serviceability are mandatory.

Availability

7B27-K-02-1 is available at Aetrix Electronics and suitable for industrial process monitoring, furnace temperature control, power plant boiler sensors, and chemical reactor safety systems requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for 7B27-K-02-1 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 leader specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision measurement and industrial control.

The 7B Series was engineered specifically for rugged industrial signal conditioning - delivering isolated, linearized, and protected analog interfaces between harsh field sensors and programmable logic controllers or data acquisition systems.

FAQ

What thermocouple types does the 7B27-K-02-1 support?

The 7B27-K-02-1 supports Type K thermocouples exclusively, with factory-calibrated linearization over −100°C to +1350°C. It does not support J, T, E, R, S, or B types - those require distinct model numbers (e.g., 7B27-J-01-1 or 7B27-B-07-1). The "K" in the part number explicitly denotes Type K configuration, and internal firmware and calibration coefficients are fixed for this thermocouple standard per ASTM E230.

Does the 7B27-K-02-1 require an external cold junction compensation sensor?

No - the 7B27-K-02-1 relies on the thermistor-based cold junction compensation (CJC) sensor embedded in each channel of compatible 7B Series backplanes (e.g., AC1363). This integrated CJC delivers ±1.0°C accuracy over +5°C to +45°C ambient. Using the 7B27-K-02-1 outside a 7B Series backplane voids CJC specification and invalidates accuracy claims.

What is the meaning of "upscale open-circuit indication" for the 7B27-K-02-1?

When the thermocouple loop opens (e.g., wire break or disconnection), the 7B27-K-02-1 outputs a voltage greater than +5 V - an "upscale" condition clearly distinguishable from the normal +1 V to +5 V operating range. This feature enables immediate fault detection in downstream PLCs or controllers without additional comparators or logic, directly supporting SIL-2-capable safety functions.

Can the 7B27-K-02-1 be used with a 12 VDC supply?

No - the 7B27-K-02-1 requires a minimum +14 VDC supply and operates up to +35 VDC. A 12 VDC source falls below the specified operating range and will not power the internal DC/DC converter or isolation circuitry reliably. Attempting operation at 12 VDC may result in undefined output behavior, failure to meet accuracy specs, or inability to drive the output buffer.

Is the 7B27-K-02-1 pin-compatible with other 7B Series modules?

Yes - the 7B27-K-02-1 uses the universal 6-pin screw-terminal pinout defined for all 7B Series input modules (Pins 0–5 as SENSOR INPUT, INPUT HIGH, INPUT LOW, POWER SUPPLY, OUTPUT VOLTAGE, and COMMON). This allows mix-and-match installation and hot-swap replacement with modules like 7B21, 7B22, or 7B39 without rewiring or PCB changes.