Analog Devices Inc. AD8418AWBRMZ-RL

Overview

AD8418AWBRMZ-RL from Analog Devices is a bidirectional, zero-drift current sense amplifier with 20 V/V fixed gain, ±200 μV max input offset over −40°C to +125°C, −2 V to +70 V continuous common-mode input range, and EMI filtering-designed for high-side current monitoring in automotive motor control systems.

For engineers reviewing the AD8418AWBRMZ-RL datasheet, AD8418AWBRMZ-RL pinout, AD8418AWBRMZ-RL application, or AD8418AWBRMZ-RL equivalent, this page delivers verified specifications, FMEA-tolerant 8-lead MSOP package details, bidirectional operation guidance, and automotive-grade selection criteria including AEC-Q100 qualification and PWM common-mode rejection.

Technical Context

The AD8418AWBRMZ-RL implements a zero-drift chopper-stabilized architecture enabling 0.1 μV/°C typical offset drift and <400 nV/°C max drift across −40°C to +125°C. Its differential input stage rejects fast-changing PWM common-mode voltages up to 1 V/ns while maintaining ≥90 dB DC CMRR and 86 dB CMRR at 10 kHz.

It supports unidirectional and bidirectional current sensing via configurable reference inputs (VREF1/VREF2), delivering ratiometric output offset adjustment from GND to VS with ±1 mV/V accuracy referred to output. The device operates from 2.7 V to 5.5 V and sinks/supplies up to 40 mA output current.

Key Specifications

Pinout & Package

AD8418AWBRMZ-RL is housed in an 8-lead MSOP package (RMZ suffix) with exposed pad for thermal performance. Pin layout matches standard 8-lead SOIC_N but uses MSOP footprint; RoHS-compliant, moisture sensitivity level 1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD8418AWBRMZ-RL, AD8417ARWZ-R7 offers higher gain for improved low-current SNR but reduced common-mode margin, while INA240A1QPWRQ1 provides wider voltage tolerance in a smaller package at the cost of bandwidth-making AD8418AWBRMZ-RL optimal for automotive motor control requiring speed, accuracy, and fault resilience.

Availability

AD8418AWBRMZ-RL is available at Aetrix Electronics and suitable for automotive motor control, solenoid actuation, and battery management systems requiring stable component supply, AEC-Q100 compliance, and production-ready lead times.

Supply support for AD8418AWBRMZ-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 automotive, industrial, communications, and healthcare markets since 1965.

The AD8418A product line delivers precision current sensing for safety-critical automotive applications, engineered specifically for motor control, solenoid drive, and powertrain systems demanding zero-drift accuracy and PWM noise immunity.

FAQ

What is the operating temperature range specified for the AD8418AWBRMZ-RL?

The AD8418AWBRMZ-RL is rated for operation from −40°C to +125°C, meeting AEC-Q100 Grade 1 requirements. This range is validated across all electrical parameters including gain error (±0.15%), offset voltage (±200 μV), and CMRR (≥90 dB). The device maintains functionality beyond this range-surviving −3 V to +80 V common-mode voltage at temperatures up to +150°C-but full specification compliance applies only within the −40°C to +125°C band.

Does the AD8418AWBRMZ-RL support bidirectional current measurement out of the box?

Yes, the AD8418AWBRMZ-RL supports bidirectional current measurement without external components. By connecting VREF1 to VS and VREF2 to GND, the output centers at VS/2, enabling symmetric positive and negative current detection. This configuration is explicitly validated in the datasheet's "Splitting the Supply" section and requires no trimming resistors or calibration-delivering true bidirectional capability with 20 V/V gain and <0.1% gain error over temperature.

How does the AD8418AWBRMZ-RL handle PWM-induced common-mode noise?

The AD8418AWBRMZ-RL incorporates patented circuitry and integrated EMI filters to reject PWM common-mode transients up to 1 V/ns. Its zero-drift architecture maintains <0.4 μV/°C max offset drift even under rapid common-mode shifts, and its 90 dB DC CMRR drops only to 86 dB at 10 kHz-ensuring accurate current measurement during gate-driver switching in motor inverters. This behavior is confirmed in Figure 19 and Figure 20 of the Rev. E datasheet.

What package type is used for the AD8418AWBRMZ-RL, and is it pin-compatible with other AD8418 variants?

The AD8418AWBRMZ-RL uses an 8-lead MSOP package (RMZ suffix) with exposed thermal pad. It shares identical pinout and footprint with the AD8418AWBRZ-R7 (SOIC_N) and AD8418AWBRMZ-R7 (same MSOP), making them mechanically interchangeable. All three variants use the same 8-pin configuration shown in Figure 2 of the datasheet-pin 1 (−IN), pin 2 (GND), pin 3 (VREF2), pin 4 (NC), pin 5 (OUT), pin 6 (VS), pin 7 (VREF1), pin 8 (+IN).

Is the AD8418AWBRMZ-RL qualified for automotive applications, and what standards does it meet?

Yes, the AD8418AWBRMZ-RL is AEC-Q100 qualified for automotive applications (Grade 1, −40°C to +125°C). It meets stress test requirements for human-body-model ESD (±2000 V), operating life, and thermal cycling. The device also supports failure mode and effects analysis (FMEA) through its 10-lead MSOP pinout option (not used in RMZ), but the RMZ variant itself is qualified for automotive use per AEC-Q100 Rev. H and is widely deployed in production motor control ECUs.