Analog Devices Inc. AD8418AWBRMZ-10

Overview

AD8418AWBRMZ-10 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 AEC-Q100 qualification for automotive motor and solenoid control. It delivers 250 kHz bandwidth and integrated EMI filters for accurate shunt-based current measurement in PWM-rich environments.

For engineers reviewing the AD8418AWBRMZ-10 datasheet, AD8418AWBRMZ-10 pinout, AD8418AWBRMZ-10 application, or AD8418AWBRMZ-10 equivalent, key selection criteria include bidirectional operation capability, FMEA-tolerant 10-lead MSOP packaging, ratiometric output offset adjustment, high CMRR (≥90 dB dc), and survival up to −3 V to +80 V common-mode voltage.

Technical Context

The AD8418AWBRMZ-10 implements a proprietary zero-drift architecture enabling 0.1 μV/°C typical offset drift and <400 nV/°C max drift across −40°C to +125°C while maintaining 250 kHz small-signal bandwidth. Its dual reference inputs (VREF1/VREF2) support flexible output offset configuration-ground-referenced, supply-referenced, external-referenced, or ratiometric mid-scale (VS/2).

Designed for harsh automotive environments, it integrates EMI filters and patented circuitry to reject fast PWM common-mode transients up to 1 V/ns, with guaranteed operation from −2 V to +70 V common-mode and survival to −3 V to +80 V. The 10-lead MSOP package features strategically placed NC pins between critical terminals (−IN/GND and +IN/VREF1) to mitigate single-point PCB fault effects per FMEA requirements.

Key Specifications

Pinout & Package

AD8418AWBRMZ-10 is housed in a 10-lead MSOP package with FMEA-optimized pinout: pin spacing and NC placement isolate high-voltage inputs (−IN, +IN) from GND and reference pins to prevent catastrophic failure from adjacent trace shorts. Thermal resistance θ_JA = 134.5°C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD8418AWBRMZ-10, AD8417ARWZ trades FMEA robustness for higher gain and lower offset, while INA240A1QDRQ1 extends voltage range at the cost of bandwidth and fault-tolerant packaging - making AD8418AWBRMZ-10 optimal for AEC-Q100-compliant 12 V/24 V motor control where PWM rejection and layout resilience are critical.

Availability

AD8418AWBRMZ-10 is available at Aetrix Electronics and suitable for automotive motor control, solenoid actuation, and diagnostic protection systems requiring stable component supply, long-term lifecycle assurance, and AEC-Q100-compliant sourcing.

Supply support for AD8418AWBRMZ-10 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 AD8418A product line delivers precision current sensing for safety-critical automotive subsystems, combining zero-drift accuracy, high common-mode rejection, and FMEA-aware packaging to meet ISO 26262 ASIL-B system requirements.

FAQ

What is the operating temperature range for AD8418AWBRMZ-10?

The AD8418AWBRMZ-10 is specified for operation from −40°C to +125°C and qualified to AEC-Q100 Grade 1 standards. This range covers under-hood automotive environments including engine control modules and transmission controllers where ambient temperatures exceed 105°C. The device maintains ±200 μV max input offset and 20 V/V gain accuracy across this full span.

Does AD8418AWBRMZ-10 support unidirectional current sensing?

Yes, AD8418AWBRMZ-10 supports both unidirectional and bidirectional operation. For unidirectional use, tie both VREF1 and VREF2 to GND (output near 0 V at zero input) or to VS (output near VS at zero input). The amplifier's 20 V/V gain and 250 kHz bandwidth remain fully functional, enabling precise one-quadrant current measurement in power supply monitoring or battery charging circuits.

How does the FMEA-tolerant pinout of AD8418AWBRMZ-10 improve system reliability?

The AD8418AWBRMZ-10's 10-lead MSOP package inserts NC pins between −IN and GND, and between +IN and VREF1. This physical separation prevents short-circuit faults - such as solder bridges or PCB trace defects - from connecting high-voltage inputs to ground or supply rails. As confirmed in Analog Devices' FMEA analysis (Table 6), adjacent-pin shorts result in benign behavior (e.g., output saturation) rather than destructive latch-up or fire hazard.

Can AD8418AWBRMZ-10 interface directly with a 3.3 V ADC?

Yes, AD8418AWBRMZ-10 can drive a 3.3 V ADC directly. With VS = 3.3 V, its output swings from 0.032 V to 3.268 V into 25 kΩ, fully covering the 0–3.3 V input range. Configuring VREF1 = VS and VREF2 = GND sets the zero-current output to 1.65 V (mid-scale), enabling ±1.65 V bidirectional measurement. No level-shifting circuitry is needed.

What is the maximum capacitive load AD8418AWBRMZ-10 can drive without oscillation?

AD8418AWBRMZ-10 is stable driving up to 500 pF capacitive load, as verified in Figure 21 of the Rev. E datasheet. This allows direct connection to ADC input capacitors, long PCB traces, or RC anti-aliasing filters without external isolation resistors. For loads exceeding 500 pF, a series 10 Ω resistor at the output restores stability while preserving signal integrity for bandwidths below 250 kHz.