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Analog Devices Inc. AD8418AWHRMZ
- Part No.:
- AD8418AWHRMZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
AD8418AWHRMZ.pdf
- Description:
- IC CURRENT SENSE 1 CIRCUIT 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,102
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Product details
Overview
AD8418AWHRMZ from Analog Devices is a bidirectional, zero-drift current sense amplifier optimized for high-side and low-side shunt-based current measurement in automotive motor and solenoid control. It delivers 20 V/V initial gain, ±200 μV max input offset over −40°C to +150°C, 90 dB min DC CMRR, −2 V to +70 V continuous common-mode input range, and 250 kHz bandwidth - enabling accurate PWM-aware current monitoring in AEC-Q100-compliant systems.
For engineers reviewing the AD8418AWHRMZ datasheet, AD8418AWHRMZ pinout, AD8418AWHRMZ application, or AD8418AWHRMZ equivalent, this page provides verified specifications, FMEA-tolerant 10-lead MSOP package details, bidirectional operation guidance, and automotive-grade alternative comparisons - all grounded in Rev. E datasheet parameters and Analog Devices' official ordering guide.
Technical Context
The AD8418AWHRMZ employs a proprietary zero-drift architecture achieving typical 0.1 μV/°C offset drift and <400 nV/°C drift specification, maintaining precision across −40°C to +150°C without bandwidth sacrifice. Its dual EMI filters and patented circuitry reject fast-rising PWM common-mode transients up to 1 V/ns while sustaining >86 dB CMRR from dc to 10 kHz.
It supports flexible output offset configuration via VREF1/VREF2 pins - enabling ground-referenced, supply-referenced, external-referenced, or ratiometric mid-scale (VS/2) setups. The device operates from 2.7 V to 5.5 V, draws 4.2 mA quiescent current at +150°C, and survives −3 V to +80 V common-mode voltage extremes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Initial Gain | 20 V/V - fixed precision gain enables direct interface with 12-bit+ ADCs without external scaling. |
| Input Offset Voltage (max) | ±200 μV over −40°C to +150°C - ensures ≤10 mV error at 50 mΩ shunt with 10 A full-scale current. |
| Common-Mode Range | −2 V to +70 V continuous - supports high-side sensing in 12 V/24 V/48 V automotive battery rails with margin. |
| CMRR (min) | 90 dB at dc - rejects battery ripple and switching noise in motor phase-leg measurements. |
| Small-Signal Bandwidth | 250 kHz - captures fast current transients during PWM edge transitions in H-bridge control. |
| Supply Voltage Range | 2.7 V to 5.5 V - compatible with standard 3.3 V and 5 V microcontroller I/O domains. |
| Quiescent Current | 4.2 mA at +150°C - enables thermal-stable operation in under-hood powertrain modules. |
| AEC-Q100 Grade | Grade 0 (−40°C to +150°C) - qualified for engine compartment and transmission control unit deployment. |
Pinout & Package
AD8418AWHRMZ is supplied in a RoHS-compliant, lead-free 10-lead MSOP package (3.0 mm × 3.0 mm, 0.5 mm pitch), engineered for FMEA compliance with strategically placed NC pins to isolate high-voltage inputs from adjacent terminals.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (−IN) | Negative Input | Connects to shunt resistor low-side terminal; withstands −2 V to +70 V common-mode voltage. |
| 2, 5, 9 (NC) | No Connect | FMEA-isolation pins prevent short-circuit faults between −IN/GND and +IN/VREF1 in PCB defects. |
| 3 (GND) | Analog Ground | Reference for internal circuitry; tied to system ground plane for noise immunity. |
| 4 (VREF2) | Reference Input 2 | Configures output offset: tie to GND, VS, or external reference to set zero-current output level. |
| 6 (OUT) | Analog Output | Buffered 20× amplified shunt voltage; drives 25 kΩ load with rail-to-rail swing (0.032 V to VS − 0.032 V). |
| 7 (VS) | Positive Supply | Accepts 2.7 V–5.5 V; powers internal amplifiers and EMI filters; PSRR = 80 dB. |
| 8 (VREF1) | Reference Input 1 | Paired with VREF2 for ratiometric offset adjustment (e.g., VREF1 = VS, VREF2 = GND → OUT = VS/2 at zero current). |
| 10 (+IN) | Positive Input | Connects to shunt resistor high-side terminal; matches −IN for matched common-mode rejection. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional current sensing | Configurable output offset enables symmetric ±50 A measurement on single 50 mΩ shunt with 2.5 V mid-scale reference. |
| Zero-drift core | Typical 0.1 μV/°C offset drift eliminates calibration drift in engine control units operating across extreme ambient cycles. |
| EMI-hardened inputs | Dual integrated EMI filters suppress RF interference from ignition systems and DC-DC converters without external LC networks. |
| PWM common-mode rejection | Patented architecture rejects >1 V/ns dV/dt transients - critical for accurate current sampling during gate-driver switching edges. |
| FMEA-optimized 10-lead MSOP | NC pins between −IN/GND and +IN/VREF1 mitigate single-point failures from solder bridges or trace shorts per ISO 26262 ASIL-B requirements. |
| AEC-Q100 Grade 0 qualification | Validated for −40°C to +150°C operation with lifetime reliability testing - suitable for transmission control and EPS modules. |
Applications
| Motor Phase Current Monitoring | Solenoid Diagnostic Control |
|---|---|
|
Use Scenario: Real-time current sampling in 3-phase inverter legs of electric power steering (EPS) systems, synchronized with PWM gate signals. IC Role / Device Role / Timing Role: High-side current sense amplifier providing bidirectional analog output referenced to microcontroller ADC, with 250 kHz bandwidth capturing instantaneous phase currents. Use Value: Enables field-oriented control (FOC) torque accuracy within ±0.5% full-scale by minimizing offset drift-induced phase imbalance across temperature. |
Use Scenario: High-side current monitoring of 12 V solenoid valves in automatic transmission shift actuators, including recirculation current detection during switch-off. IC Role / Device Role / Timing Role: Bidirectional shunt amplifier interfacing with diagnostic ASIC, configured for VS/2 mid-scale output to detect open-circuit, short-to-battery, and short-to-ground faults. Use Value: Eliminates need for separate high-side and low-side sensing circuits - reduces BOM count by one amplifier and enables single-shunt fault isolation per valve. |
| H-Bridge Bidirectional Drive | High-Rail Battery Protection |
|
Use Scenario: Current feedback in bidirectional H-bridge motor drivers for HVAC blower control, where motor direction reverses and shunt remains in series with load. IC Role / Device Role / Timing Role: Precision difference amplifier measuring current polarity and magnitude through center-shunt topology, rejecting unstable ground references. Use Value: Delivers <1% total unadjusted error over −40°C to +150°C - enabling closed-loop speed regulation without temperature compensation firmware. |
Use Scenario: High-side current monitoring in 48 V mild-hybrid battery disconnect units, detecting overcurrent events before main contactor closure. IC Role / Device Role / Timing Role: High-common-mode amplifier feeding fast comparator (e.g., AD8214) for <100 ns shutdown response during short-circuit conditions. Use Value: Supports ASIL-D safety goals by enabling hardware-level current limiting independent of microcontroller execution cycle. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar current sense amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD8418AWBRMZ | Same silicon, 8-lead MSOP package; lacks FMEA-optimized NC pins and Grade 0 temp rating (max +125°C). | Not qualified for under-hood +150°C environments; unsuitable for transmission control or turbocharger actuators. | Select AD8418AWHRMZ when AEC-Q100 Grade 0 and FMEA robustness are required; AD8418AWBRMZ suffices for cabin ECUs. |
| INA240A1QDRQ1 | Texas Instruments part; 20 V/V gain, −4 V to +80 V common-mode, but higher 500 nV/°C offset drift and no integrated EMI filters. | Requires external RC filtering for automotive EMC; less stable over temperature in long-duration engine runs. | Choose AD8418AWHRMZ for zero-drift stability in high-precision torque control; INA240A1QDRQ1 fits cost-sensitive body electronics. |
Compared with AD8418AWBRMZ and INA240A1QDRQ1, the AD8418AWHRMZ uniquely combines AEC-Q100 Grade 0 qualification, FMEA-optimized 10-lead layout, and 0.1 μV/°C drift - making it the only option for safety-critical, high-temperature motor control where offset stability directly impacts torque accuracy and functional safety compliance.
Availability
AD8418AWHRMZ is available at Aetrix Electronics and suitable for automotive powertrain control, electric power steering (EPS), automatic transmission solenoid management, and 48 V mild-hybrid battery protection requiring stable component supply across extended temperature and lifecycle demands.
Supply support for AD8418AWHRMZ 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 Wilmington, MA, with design centers worldwide and a legacy of precision signal conditioning innovation.
The AD8418A product line was developed specifically for automotive current sensing - delivering zero-drift accuracy, PWM resilience, and AEC-Q100 qualification to meet stringent functional safety and thermal reliability requirements in powertrain and chassis systems.
FAQ
What is the maximum continuous common-mode voltage the AD8418AWHRMZ can handle?
The AD8418AWHRMZ supports −2 V to +70 V continuous common-mode input voltage, with survival capability up to −3 V to +80 V. This allows direct high-side sensing on 12 V, 24 V, and 48 V automotive battery rails while maintaining accuracy during load-dump transients and cold-crank conditions. The AD8418AWHRMZ maintains specified performance across its full −40°C to +150°C operating range under these conditions.
How does the AD8418AWHRMZ achieve bidirectional current measurement?
The AD8418AWHRMZ achieves bidirectional measurement by configuring its VREF1 and VREF2 pins to set a mid-scale output voltage (e.g., VS/2) when differential input is zero. With +IN and −IN connected across a shunt, positive current produces an output above VS/2, and negative current produces an output below VS/2. The AD8418AWHRMZ's 20 V/V gain and rail-to-rail output enable full-scale resolution in both directions without external components.
Is the AD8418AWHRMZ pin-compatible with other members of the AD8418A family?
No - the AD8418AWHRMZ uses the 10-lead MSOP package with FMEA-optimized pinout (including NC pins at positions 2, 5, and 9), which differs from the 8-lead SOIC_N and 8-lead MSOP variants (AD8418AWBRMZ, AD8418AWBRZ). PCB layout must be redesigned to accommodate the 10-pin footprint and isolated input routing. The AD8418AWHRMZ shares identical electrical functionality but requires mechanical redesign.
What is the purpose of the NC pins in the AD8418AWHRMZ 10-lead MSOP package?
The NC pins (positions 2, 5, and 9) in the AD8418AWHRMZ package provide physical isolation between high-voltage input pins (−IN, +IN) and adjacent functional pins (GND, VREF2, VREF1) to prevent catastrophic failure from PCB-level shorts. As documented in the datasheet's FMEA analysis, this layout ensures that adjacent pin shorts do not cause undervoltage lockout, output saturation, or loss of diagnostic capability - meeting ASIL-B fault tolerance requirements.
Does the AD8418AWHRMZ require external passive components for stable operation?
The AD8418AWHRMZ operates stably with no external passive components for basic configurations. Its integrated EMI filters eliminate need for external RC networks. However, for capacitive loads >500 pF, a small series resistor (≤10 Ω) at the OUT pin is recommended per Figure 21 of the datasheet. No external gain-setting or offset-trim components are needed due to its fixed 20 V/V gain and configurable VREF-based offset.
AD8418AWHRMZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- Current Sense
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 1V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 250 kHz
- Current - Input Bias:
- 130 µA
- Voltage - Input Offset:
- -
- Current - Supply:
- 4.1mA
- Current - Output / Channel:
- -
- Voltage - Supply Span (Min):
- 2.7 V
- Voltage - Supply Span (Max):
- 5.5 V
- Operating Temperature:
- -40°C ~ 150°C
- Grade:
- Automotive
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MSOP
AD8418AWHRMZ FAQ
1.How can I place an order for AD8418AWHRMZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD8418AWHRMZ on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for AD8418AWHRMZ reliable?
The price and inventory of AD8418AWHRMZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD8418AWHRMZ is usually 5 days.
3.What payment methods are accepted for AD8418AWHRMZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD8418AWHRMZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD8418AWHRMZ?
AD8418AWHRMZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD8418AWHRMZ order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for AD8418AWHRMZ?
For technical support, including AD8418AWHRMZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD8418AWHRMZ requirements.
6.How does Aetrix verify that AD8418AWHRMZ is sourced from the original manufacturer or authorized distributors?
All AD8418AWHRMZ products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that AD8418AWHRMZ meets industry standards.
7.What is the process for return or replacement of AD8418AWHRMZ?
All AD8418AWHRMZ units undergo pre-shipment inspection (PSI). If there is an issue with AD8418AWHRMZ, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The AD8418AWHRMZ part is unused and in its original packaging.
Return procedure for AD8418AWHRMZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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