Analog Devices Inc. AD8417WHRZ

Overview

AD8417WHRZ from Analog Devices is a bidirectional, zero-drift current sense amplifier optimized for high-accuracy shunt-based current measurement in automotive motor and solenoid controls. It delivers 60 V/V gain, ±400 µV max input offset over −40°C to +150°C, −2 V to +70 V continuous common-mode input range, and 250 kHz bandwidth - enabling precise real-time current monitoring in PWM-rich H-bridge and 3-phase inverter systems.

For engineers reviewing the AD8417WHRZ datasheet, AD8417WHRZ pinout, AD8417WHRZ application, or AD8417WHRZ equivalent, this page provides verified technical context, AEC-Q100-qualified operating limits, FMEA-tolerant 10-lead MSOP package details, and validated alternatives for high-reliability automotive current sensing designs.

Technical Context

The AD8417WHRZ implements a patented zero-drift architecture (U.S. Patent 8,624,668 B2) that achieves 0.1 µV/°C typical offset drift without sacrificing 250 kHz bandwidth. Its EMI filters and differential input stage reject fast-changing PWM common-mode transients up to 1 V/ns while maintaining 86 dB CMRR from dc to 10 kHz.

It supports configurable unidirectional or bidirectional operation via dual reference inputs (VREF1/VREF2), enabling ratiometric output offset adjustment - including mid-scale (VS/2) setting for symmetric current measurement - with ±1 mV/V accuracy referred to output and 0.499–0.501 V/V ratiometric precision when dividing the supply.

Key Specifications

Pinout & Package

AD8417WHRZ is housed in a 10-lead MSOP package (RM-10), designed for failure mode and effects analysis (FMEA) compliance in automotive applications. The package features strategically placed NC pins between critical signal pairs (−IN/GND and +IN/VREF1) to prevent catastrophic short-circuit faults on PCBs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD8417WHRZ, AD8418WHRZ trades gain and bandwidth for improved gain accuracy, while INA240A1QDRQ1 prioritizes speed and voltage range over FMEA robustness - making AD8417WHRZ the optimal choice for ASIL-B motor control where zero-drift stability and fault-tolerant layout are mandatory.

Availability

AD8417WHRZ is available at Aetrix Electronics and suitable for automotive motor control, solenoid actuation, and high-reliability power management systems requiring stable component supply across extended temperature and long product lifecycles.

Supply support for AD8417WHRZ 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, and communications markets since 1965.

The AD8417WHRZ belongs to Analog Devices' precision current sense amplifier product line, engineered specifically for AEC-Q100-qualified automotive subsystems demanding zero-drift accuracy, PWM noise immunity, and FMEA-aware packaging.

FAQ

What is the maximum continuous common-mode input voltage for AD8417WHRZ?

The AD8417WHRZ supports −2 V to +70 V continuous common-mode input voltage, enabling reliable high-side current sensing in 12 V and 24 V automotive systems with battery load dump transients. Its survival rating extends to −3 V to +80 V, ensuring robustness against short-duration overvoltage events without latch-up or damage. This specification is validated across the full −40°C to +150°C operating range of the AD8417WHRZ.

Does AD8417WHRZ support bidirectional current measurement?

Yes, AD8417WHRZ natively supports bidirectional current measurement through its dual reference inputs (VREF1 and VREF2). By applying appropriate voltages - such as tying one to VS and the other to GND - the output can be set to mid-scale (VS/2), allowing equal positive and negative current ranges. This configuration is used in H-bridge motor control and regenerative braking circuits where direction-agnostic current feedback is essential for AD8417WHRZ-based designs.

What package type does AD8417WHRZ use, and why is it significant for automotive applications?

AD8417WHRZ uses a 10-lead MSOP (RM-10) package with FMEA-tolerant pinout, featuring NC guard pins between −IN/GND and +IN/VREF1. This layout prevents unrecoverable faults caused by adjacent trace shorts on PCBs - a critical requirement for ASIL-B automotive systems. Unlike standard 8-lead variants, the AD8417WHRZ package is explicitly engineered to meet stringent failure mode analysis criteria defined in ISO 26262, making it suitable for safety-critical motor and solenoid control modules.

How does the zero-drift architecture of AD8417WHRZ improve measurement accuracy?

The zero-drift architecture of AD8417WHRZ achieves a typical input offset drift of 0.1 µV/°C and max ±400 µV over −40°C to +150°C - significantly outperforming conventional amplifiers. This minimizes temperature-induced gain and offset errors in long-duration measurements, such as solenoid dwell time monitoring or motor phase imbalance detection. In practice, AD8417WHRZ maintains sub-0.1% total current measurement error across full automotive thermal cycles without calibration, directly supporting diagnostic compliance in AD8417WHRZ-based ECUs.

Can AD8417WHRZ interface directly with a 12-bit microcontroller ADC?

Yes, AD8417WHRZ interfaces directly with standard 12-bit microcontroller ADCs. With its 60 V/V gain and 0.045 V to VS − 0.035 V output swing (e.g., 0.045 V to 4.965 V at VS = 5 V), it delivers a full-scale output range exceeding 4.9 V - sufficient for >4090 LSB utilization on a 5 V-referenced 12-bit ADC. Its 2 Ω output impedance and 25 kΩ minimum load drive capability ensure minimal settling error and no external buffering is required for typical MCU sampling rates up to 1 MSPS in AD8417WHRZ implementations.