Analog Devices Inc. AD8208WBRZ

Overview

AD8208WBRZ from Analog Devices is a high-voltage, precision difference amplifier optimized for high-side current sensing in automotive and industrial power systems. It delivers 20 V/V system gain, −2 V to +45 V common-mode input range at 5 V supply, ±2 mV initial input offset (RTI), 80 dB minimum CMRR (dc to 10 kHz), and operates from −40°C to +125°C - enabling accurate shunt-based current monitoring in motor controls and solenoid drivers.

For engineers reviewing the AD8208WBRZ datasheet, AD8208WBRZ pinout, AD8208WBRZ application, or AD8208WBRZ equivalent, this page provides verified technical context, real-world use cases, validated alternatives, and supply-ready procurement details - all grounded in Analog Devices' Rev. C datasheet and official package documentation.

Technical Context

The AD8208WBRZ implements a two-stage architecture: a precision preamplifier (A1) with 10 V/V gain and buffered output (Pin 3), followed by a unity-gain-configurable buffer (A2) with 2 V/V default gain (Pin 4 → Pin 5). Its laser-trimmed resistor network achieves <0.01% ratio matching, enabling 80 dB CMRR across dc–10 kHz despite wide common-mode swings.

It integrates EMI filters on all inputs, supports external low-pass filtering via the accessible 100 kΩ A1 output resistor (Pin 3), and features robust survival ratings (−24 V to +80 V common-mode). The WB-grade SOIC_N package (R-8) ensures automotive-grade thermal and mechanical reliability.

Key Specifications

Pinout & Package

AD8208WBRZ uses an 8-lead SOIC_N (narrow-body) package per JEDEC MS-012-AA, with 1.27 mm lead pitch and 5.00 mm × 4.00 mm body. Pin 6 is NC; all other pins are electrically active and functionally defined in the datasheet.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-voltage difference amplifier applications.

Compared with MAX4080TASA+ and INA240A1QDRQ1, AD8208WBRZ uniquely combines accessible preamp output (Pin 3) for user-defined filtering/gain, guaranteed 80 dB CMRR up to 10 kHz, and AEC-Q100 WB-grade qualification - making it optimal for automotive motor control where noise immunity and design flexibility are jointly essential.

Availability

AD8208WBRZ is available at Aetrix Electronics and suitable for motor controls, solenoid drivers, and battery management systems requiring stable component supply, automotive qualification, and long-term lifecycle support.

Supply support for AD8208WBRZ 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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA.

The AD8208 belongs to Analog Devices' precision current-sense amplifier product line, engineered specifically for robust, high-accuracy current measurement in harsh automotive and industrial environments.

FAQ

What is the maximum common-mode voltage AD8208WBRZ can withstand continuously?

AD8208WBRZ supports a continuous input common-mode voltage range of −2 V to +45 V when operated at its nominal 5 V supply. Its survival rating extends to −24 V to +80 V, meaning it can endure these extremes without damage - critical for automotive load-dump and reverse-battery protection scenarios. This specification is explicitly confirmed in Table 2 (Absolute Maximum Ratings) and the General Description section of the Rev. C datasheet.

Does AD8208WBRZ require external components to achieve its default 20 V/V gain?

No, AD8208WBRZ achieves its default 20 V/V system gain intrinsically: the preamplifier (A1) provides 10 V/V, and the output buffer (A2) adds 2 V/V. This requires only a direct connection between Pin 3 (A1) and Pin 4 (A2), with no external resistors. The datasheet's Functional Block Diagram (Figure 1) and Theory of Operation (Page 11) confirm this internal configuration is factory-set and operational out-of-the-box.

Can AD8208WBRZ be used for low-side current sensing?

Yes, AD8208WBRZ supports low-side current sensing as documented in the Applications Information section (Page 12, Figure 28). In this configuration, it rejects ground noise and maintains high input-to-output linearity. Its −2 V common-mode lower limit allows operation below ground potential - essential for accurately measuring current through low-side shunts during inductive kickback events.

What package type is used by AD8208WBRZ, and is it RoHS compliant?

AD8208WBRZ uses the 8-lead SOIC_N (narrow-body) package per JEDEC MS-012-AA, with dimensions 5.00 mm × 4.00 mm. It is RoHS compliant and halogen-free, as stated in Analog Devices' official ordering guide and package outline drawings (Page 16, Figure 38). The "WBRZ" suffix denotes this specific WB-grade, lead-free SOIC variant.

How does the EMI filtering in AD8208WBRZ improve system-level noise immunity?

AD8208WBRZ integrates dedicated EMI filters on both +IN and −IN pins, as highlighted in the Features list and Functional Block Diagram. These filters attenuate high-frequency interference (e.g., from switch-mode power supplies or motor commutation) before it reaches the precision amplifier core - preventing RF rectification that would otherwise manifest as DC offset errors or gain nonlinearity. This is especially effective in automotive environments where conducted emissions exceed CISPR 25 Class 5 limits.