Analog Devices Inc. AD8226BRMZ-RL

Overview

AD8226BRMZ-RL from Analog Devices is a rail-to-rail output instrumentation amplifier with gain set by a single external resistor (1–1000), wide supply range (±1.35 V to ±18 V or 2.2 V to 36 V), −40°C to +125°C operation, and 22 nV/√Hz input voltage noise. It enables precision amplification of low-level bridge sensor signals in industrial process controls and portable data acquisition systems.

For engineers reviewing the AD8226BRMZ-RL datasheet, AD8226BRMZ-RL pinout, AD8226BRMZ-RL application, or AD8226BRMZ-RL equivalent, key selection criteria include its guaranteed CMRR ≥90 dB at G=1, input voltage range extending below negative supply, robust ±35 V input overvoltage tolerance with ±5 V supplies, and MSOP-8 package suitability for space-constrained multichannel designs.

Technical Context

The AD8226BRMZ-RL employs a three-op-amp instrumentation architecture with pnp-input transistors enabling input bias current flow out of both inputs and operation with common-mode voltages down to −VS − 0.1 V. Its gain is precisely set via external resistor RG between Pins 2 and 3 using the formula G = 1 + (49.4 kΩ/RG).

It features a dedicated REF pin (Pin 6) with 100 kΩ input impedance and unity-gain reference feedthrough, allowing level-shifting of the output baseline without affecting gain accuracy. Input protection handles ±40 V beyond rails, and rail-to-rail output swing delivers >99% of supply range into 10 kΩ loads at +25°C.

Key Specifications

Pinout & Package

AD8226BRMZ-RL is housed in an 8-lead MSOP package (3.0 mm × 3.0 mm, 0.65 mm pitch), optimized for high-density PCB layouts and zero-airflow thermal environments.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD8227ARMZ-R7 and INA333AIDRGT, the AD8226BRMZ-RL uniquely combines unity-gain capability, MSOP-8 footprint, and robust input overvoltage tolerance-making it optimal for cost-sensitive, space-constrained industrial sensor nodes where G = 1–1000 flexibility and ±35 V fault resilience are essential.

Availability

AD8226BRMZ-RL is available at Aetrix Electronics and suitable for industrial process controls, bridge amplifier modules, and portable data acquisition systems requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for AD8226BRMZ-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.

The AD8226 product line delivers low-cost, wide-supply-range instrumentation amplifiers designed specifically for ruggedized sensor signal conditioning in space- and power-constrained industrial and portable equipment.

FAQ

What is the minimum gain achievable with AD8226BRMZ-RL?

The AD8226BRMZ-RL supports a minimum gain of 1, set by connecting Pins 2 and 3 (RG) with a 49.4 kΩ resistor. This unity-gain capability distinguishes it from alternatives like the AD8227, which requires minimum G = 5. The AD8226BRMZ-RL maintains 90 dB CMRR and 22 nV/√Hz noise even at G = 1, making it suitable for buffer and low-gain sensor interfaces.

Does AD8226BRMZ-RL require dual supplies, or can it operate from a single rail?

AD8226BRMZ-RL operates from either single supply (2.2 V to 36 V) or dual supplies (±1.35 V to ±18 V). Its input voltage range extends to −VS − 0.1 V at +25°C, enabling amplification of signals near or below ground without dual supplies. The AD8226BRMZ-RL's rail-to-rail output further maximizes dynamic range in single-supply systems.

What is the maximum input overvoltage rating for AD8226BRMZ-RL?

The AD8226BRMZ-RL is rated for input voltages up to ±40 V beyond the supply rails (e.g., −VS + 40 V and +VS − 40 V). With ±5 V supplies, this translates to guaranteed survival at ±35 V input - eliminating need for external protection diodes in industrial I/O modules exposed to inductive kickback or ESD events.

How does the REF pin function in AD8226BRMZ-RL?

The REF pin (Pin 6) of AD8226BRMZ-RL provides a high-impedance (100 kΩ), unity-gain path to shift the output DC level. Driving REF with a stable voltage (e.g., mid-supply or DAC output) offsets VOUT without affecting gain accuracy or CMRR. The AD8226BRMZ-RL specifies 0.01% reference gain error, ensuring precise level translation in multichannel systems with shared reference sources.

Is AD8226BRMZ-RL compatible with standard MSOP-8 PCB footprints?

Yes, AD8226BRMZ-RL uses the industry-standard 8-lead MSOP package (3.0 mm × 3.0 mm, 0.65 mm pitch) with JEDEC MO-187AC dimensions. Its thermal resistance θJA is 135°C/W on a 4-layer JEDEC board, and the AD8226BRMZ-RL is fully compatible with automated SMT assembly processes including reflow profiling per IPC/JEDEC J-STD-020.