Analog Devices Inc. AD627BRZ-RL

Overview

AD627BRZ-RL from Analog Devices is a micropower, rail-to-rail output instrumentation amplifier designed for precision signal conditioning in low-power, single- or dual-supply systems. It delivers 85 μA max supply current, ±18 V / +2.2 V to +36 V supply range, gain of 5 (no external resistor) to 1000 (with RG), and 80 kHz bandwidth at G = +5 - enabling use in battery-powered ECG front-ends and 4 mA–20 mA loop receivers.

For engineers reviewing the AD627BRZ-RL datasheet, AD627BRZ-RL pinout, AD627BRZ-RL application, or AD627BRZ-RL equivalent, this page provides verified functional identity, validated SOIC_N-8 pin mapping, confirmed rail-to-rail output swing and CMRR performance up to 200 Hz, and two field-validated alternative parts with documented gain/offset trade-offs.

Technical Context

The AD627BRZ-RL implements a modified current-feedback architecture with interstage feedforward compensation, delivering superior CMRR (>83 dB at dc, >77 dB up to 200 Hz) without sacrificing bandwidth or power. Its dual-loop topology uses laser-trimmed internal resistors (R1–R4) to fix nominal gain at 5, with external RG across Pins 1/8 scaling gain per Gain = 5 + (200 kΩ/RG).

It supports true rail-to-rail output swing (±25 mV from rails at RL = 100 kΩ), operates from single supplies as low as +2.2 V, and maintains 125 μV max input offset voltage (AD627B grade) and 1 μV/°C max offset drift - critical for thermocouple amplification and portable medical sensing where dc accuracy and thermal stability are non-negotiable.

Key Specifications

Pinout & Package

AD627BRZ-RL is packaged in an 8-lead SOIC_N (R-8) with standard industry pinout and 1.27 mm pitch. The package is RoHS-compliant, moisture-sensitive level 1, and rated for −40°C to +85°C operation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar instrumentation amplifier applications.

Compared with AD8421ARMZ and INA333AIDRGT, AD627BRZ-RL uniquely balances micropower consumption (85 μA), high CMRR retention up to 200 Hz, and rail-to-rail output in a single SOIC-8 package - making it irreplaceable in battery-powered industrial sensors where both longevity and line-noise immunity are required.

Availability

AD627BRZ-RL is available at Aetrix Electronics and suitable for 4 mA–20 mA loop receivers, portable ECG monitors, thermocouple amplifiers, and industrial transducer interfaces requiring stable component supply across long-lifecycle OEM programs.

Supply support for AD627BRZ-RL 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 leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets since 1965.

The AD627BRZ-RL belongs to Analog Devices' precision instrumentation amplifier product line, engineered specifically for low-power, high-accuracy signal conditioning in battery-operated and noise-sensitive measurement systems.

FAQ

What is the maximum gain achievable with AD627BRZ-RL, and how is it set?

The AD627BRZ-RL achieves a maximum gain of 1000 by connecting an external resistor (RG) between Pins 1 and 8, per Gain = 5 + (200 kΩ/RG). With no external resistor, gain defaults to 5. For G = 1000, RG = 205 Ω (1% tolerance recommended). The internal laser-trimmed resistors ensure gain accuracy remains within 0.35% for G = 100 and 0.35% for G = 1000 (AD627B grade), as specified in Table 1 of the Rev. E datasheet.

Does AD627BRZ-RL support true rail-to-rail output swing, and under what conditions?

Yes, AD627BRZ-RL delivers rail-to-rail output swing: within ±25 mV of the supply rails at RL = 100 kΩ, and within ±70 mV at RL = 20 kΩ (per Table 1, Single Supply section). This behavior holds across its full operating temperature range (−40°C to +85°C) and supply range (+2.2 V to +36 V single or ±1.1 V to ±18 V dual). Output swing is referenced to the voltage applied at the REF pin, not ground.

What is the input offset voltage specification for AD627BRZ-RL, and how does it vary with temperature?

AD627BRZ-RL (AD627B grade) specifies a maximum input offset voltage of 125 μV at 25°C and 215 μV over temperature (−40°C to +85°C), with a maximum offset drift of 1 μV/°C (Table 2, Dual Supply section). These values are measured with VREF = 0 V and VS = ±15 V. The low drift ensures minimal baseline shift in thermocouple or strain-gauge applications across ambient temperature changes.

Can AD627BRZ-RL operate from a single 3.3 V supply, and what are the input voltage limits?

Yes, AD627BRZ-RL operates from a single +3.3 V supply (within its +2.2 V to +36 V range). Input common-mode voltage range is (−VS) − 0.1 V to (+VS) − 1 V - i.e., −0.1 V to +2.3 V with +3.3 V supply. To avoid clipping, ensure differential input stays within this window and that REF is set appropriately (e.g., 1.65 V for bipolar signal centering). Figure 38 in the datasheet confirms valid REF vs. −IN combinations at low supply voltages.

How does the CMRR of AD627BRZ-RL perform at 60 Hz, and why is this important?

AD627BRZ-RL maintains ≥77 dB CMRR at 60 Hz (G = +5, VS = ±5 V, 1 kΩ source imbalance), as shown in Figure 23 and Table 2. This high, frequency-stable CMRR enables effective rejection of 60 Hz mains interference in industrial and medical environments - eliminating the need for external notch filters and reducing system complexity and cost in ECG, process control, and sensor signal chains.