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Analog Devices Inc. AD8418AWBRMZ
- Part No.:
- AD8418AWBRMZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
AD8418AWBRMZ.pdf
- Description:
- IC CURRENT SENSE 1 CIRCUIT 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:5,192
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Product details
Overview
AD8418AWBRMZ 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 controls. It delivers 20 V/V initial gain, ±200 μV max input offset over −40°C to +125°C, 90 dB min DC CMRR, and operates from −2 V to +70 V common-mode input range with 2.7 V to 5.5 V supply.
For engineers reviewing the AD8418AWBRMZ datasheet, AD8418AWBRMZ pinout, AD8418AWBRMZ application, or AD8418AWBRMZ equivalent, this page provides 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 capability.
Technical Context
The AD8418AWBRMZ employs 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, without bandwidth compromise (250 kHz small-signal −3 dB bandwidth). Its dual EMI filters and patented circuitry suppress errors induced by fast PWM common-mode transients up to 1 V/ns.
It supports flexible output referencing via VREF1/VREF2 pins-enabling ground-referenced, supply-referenced, external-reference, or ratiometric mid-scale (VS/2) configurations. The device achieves ±0.15% gain error over temperature and maintains 86 dB CMRR up to 10 kHz, critical for accurate phase-current sampling in 3-phase motor drives.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Initial Gain | 20 V/V - fixed precision ratio enabling direct shunt voltage-to-current conversion without external gain-setting resistors. |
| Input Offset Voltage (max) | ±200 μV over −40°C to +125°C - ensures ≤10 mV total error at 50 mΩ shunt with 1 A current, critical for diagnostic accuracy. |
| Common-Mode Input Range | −2 V to +70 V continuous - supports high-side sensing in 12 V/24 V automotive systems with battery transients and inductive kickback. |
| CMRR (min, DC) | 90 dB - rejects >31,600× common-mode interference, essential for stable measurements amid noisy PWM switching nodes. |
| Supply Voltage Range | 2.7 V to 5.5 V - compatible with standard 3.3 V and 5 V microcontroller ADC reference rails and logic interfaces. |
| Bandwidth | 250 kHz - captures fast current transients in H-bridge commutation and solenoid turn-on/turn-off events. |
| Quiescent Current | 4.1 mA at −40°C to +125°C - enables low-power operation in always-on vehicle subsystems without thermal derating. |
Pinout & Package
AD8418AWBRMZ is housed in an 8-lead MSOP package (JEDEC MO-187AA), RoHS-compliant, with 0.65 mm lead pitch and exposed pad for thermal enhancement. The package is AEC-Q100 qualified and rated for −40°C to +125°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (−IN) | Negative Input | Connects to shunt resistor low-side; differential input node referenced to −2 V to +70 V common-mode range. |
| 2 (GND) | Ground | Power and signal reference return; internal ESD diode path for fault tolerance during open-pin conditions. |
| 3 (VREF2) | Reference Input 2 | Configurable bias node: tied to GND, VS, or external reference to set output offset (e.g., VS/2 for bidirectional mode). |
| 4 (NC) | No Connect | Unbonded pin; must remain unconnected to prevent unintended coupling or latch-up in FMEA-critical layouts. |
| 5 (OUT) | Amplified Output | Buffered 0.032 V to (VS − 0.032 V) rail-to-rail output; drives 25 kΩ loads directly into MCU ADC inputs. |
| 6 (VS) | Positive Supply | 2.7 V to 5.5 V single supply; powers internal amplifiers and EMI filters; supplies internal reference divider network. |
| 7 (VREF1) | Reference Input 1 | Functionally identical to VREF2; used in parallel or split with VREF2 to generate ratiometric mid-scale offset. |
| 8 (+IN) | Positive Input | Connects to shunt resistor high-side; completes differential pair with −IN for bidirectional current polarity detection. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional current sensing | Enables full-range measurement of forward/reverse motor or solenoid currents using single shunt and VS/2 output offset configuration. |
| AEC-Q100 Grade 1 qualification | Validated for −40°C to +125°C operation with lifetime reliability testing per automotive stress standards. |
| FMEA-tolerant 8-lead MSOP pinout | Includes NC pins between −IN/GND and +IN/VREF1 to prevent catastrophic failure from adjacent PCB trace shorts. |
| EMI-filtered inputs | Integrated RC filters suppress RF noise from switch-mode power stages and reduce susceptibility to ISO 11452-4 conducted emissions. |
| PWM common-mode rejection | Maintains accuracy under fast dV/dt common-mode transients (up to 1 V/ns), enabling use in gate-driver feedback loops. |
| Ratiometric output offset adjustment | VREF1/VREF2 allow precise, supply-voltage-tracking mid-scale output (e.g., 2.5 V @ 5 V) without external voltage references. |
Applications
| Motor Control | Solenoid Control |
|---|---|
|
Use Scenario: Real-time phase current monitoring in 3-phase BLDC motor drives with space-vector PWM. IC Role / Device Role / Timing Role: High-side current sense amplifier providing isolated, low-drift analog feedback to MCU ADC for field-oriented control (FOC) loop closure. Use Value: 250 kHz bandwidth and 0.1 μV/°C drift ensure sub-1% current measurement error across temperature and PWM duty cycles, improving torque ripple suppression. |
Use Scenario: High-side current sensing in automotive transmission solenoid valve drivers with diagnostic short-to-battery/short-to-ground detection. IC Role / Device Role / Timing Role: Bidirectional shunt amplifier interfacing solenoid current to safety MCU for real-time fault classification and fail-safe shutdown. Use Value: −2 V to +70 V common-mode range captures recirculation current during switch-off and clamp diode conduction, enabling complete solenoid health assessment. |
| Power Management | Diagnostic Protection |
|
Use Scenario: Inverter DC-link current monitoring in 48 V mild-hybrid vehicle power distribution units (PDUs). IC Role / Device Role / Timing Role: High-voltage current sense amplifier feeding isolated sigma-delta ADC for battery state-of-charge and load balancing algorithms. Use Value: 90 dB CMRR and EMI filtering reject noise from high-frequency DC-DC converters, ensuring stable current reporting under dynamic load transients. |
Use Scenario: Overcurrent detection and reporting in automotive body control modules (BCMs) for lighting and HVAC actuators. IC Role / Device Role / Timing Role: Precision current monitor generating analog output for MCU threshold comparison and digital fault flag generation. Use Value: ±200 μV max offset enables reliable 50 mA trip-level detection at 100 mΩ shunt, supporting ASIL-B functional safety requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar current sense amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD8417ARWZ | 60 V/V gain, ±100 μV max offset, same −40°C to +150°C grade (AWH), but no FMEA-optimized pinout. | Better suited for low-current, high-gain applications (e.g., <10 A); lacks NC pins for adjacent-short immunity in safety-critical PCBs. | Select AD8417ARWZ only when higher gain is required and FMEA robustness is not mandated by system ASIL level. |
| INA240A1QDRQ1 | 20 V/V gain, −5 V to +85 V common-mode, 120 dB CMRR, but 500 kHz bandwidth and higher quiescent current (8.5 mA). | Superior CMRR for ultra-noisy environments; wider common-mode supports 48 V systems; higher IQ increases thermal load in dense layouts. | Choose INA240A1QDRQ1 for 48 V architectures or where >100 dB CMRR is mandatory; AD8418AWBRMZ preferred for 12/24 V cost-optimized AEC-Q100 designs. |
Compared with AD8417ARWZ and INA240A1QDRQ1, AD8418AWBRMZ uniquely balances AEC-Q100 Grade 1 qualification, FMEA-tolerant 8-lead MSOP layout, and 250 kHz bandwidth at 4.1 mA IQ-making it optimal for mainstream 12 V/24 V motor and solenoid control where pin-level fault resilience is required.
Availability
AD8418AWBRMZ is available at Aetrix Electronics and suitable for automotive motor control, solenoid actuation, and power management systems requiring stable component supply, long-term lifecycle support, and AEC-Q100 compliance.
Supply support for AD8418AWBRMZ 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 was designed specifically for robust, high-accuracy current sensing in automotive powertrain and chassis systems-emphasizing zero-drift stability, PWM immunity, and FMEA-aware packaging for ASIL-B/C applications.
FAQ
What is the operating temperature range specified for AD8418AWBRMZ?
The AD8418AWBRMZ is rated for −40°C to +125°C operation, meeting AEC-Q100 Grade 1 requirements. This range is validated for full performance including ±200 μV max input offset, 90 dB min CMRR, and 20 V/V gain accuracy. The wider +150°C option (AD8418AWH) is not applicable to the AWBRMZ variant.
Does AD8418AWBRMZ support bidirectional current measurement, and how is it configured?
Yes, AD8418AWBRMZ supports true bidirectional current measurement. It is configured by applying complementary voltages to VREF1 and VREF2-typically tying VREF1 to VS and VREF2 to GND to establish a ratiometric mid-scale output (VS/2). When differential input is zero, OUT = VS/2; positive current shifts output upward, negative current downward-enabling full-range sensing with single shunt.
What package type and pin count does AD8418AWBRMZ use, and is it FMEA-optimized?
AD8418AWBRMZ uses an 8-lead MSOP package (JEDEC MO-187AA) with a dedicated FMEA-optimized pinout. It includes NC pins between −IN/GND and +IN/VREF1 to isolate high-voltage inputs from adjacent signal/power pins, mitigating failure modes from PCB trace shorts-a key requirement for automotive ASIL-B systems.
How does AD8418AWBRMZ handle PWM-induced common-mode noise?
AD8418AWBRMZ incorporates dual on-chip EMI filters and patented circuitry that actively suppresses errors from fast PWM common-mode transients up to 1 V/ns. Its 90 dB DC CMRR and 86 dB CMRR at 10 kHz ensure stable output even when placed directly on high-side switch nodes in motor inverters or solenoid drivers.
What is the maximum continuous common-mode input voltage for AD8418AWBRMZ?
The AD8418AWBRMZ supports −2 V to +70 V continuous common-mode input voltage, with survival capability up to −3 V to +80 V. This allows safe operation during battery jump-starts, load-dump transients, and inductive kickback in 12 V and 24 V automotive systems without external protection circuitry.
AD8418AWBRMZ 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 ~ 125°C
- Grade:
- Automotive
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MSOP
AD8418AWBRMZ FAQ
1.How can I place an order for AD8418AWBRMZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD8418AWBRMZ 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 AD8418AWBRMZ reliable?
The price and inventory of AD8418AWBRMZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD8418AWBRMZ is usually 5 days.
3.What payment methods are accepted for AD8418AWBRMZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD8418AWBRMZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD8418AWBRMZ?
AD8418AWBRMZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD8418AWBRMZ 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 AD8418AWBRMZ?
For technical support, including AD8418AWBRMZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD8418AWBRMZ requirements.
6.How does Aetrix verify that AD8418AWBRMZ is sourced from the original manufacturer or authorized distributors?
All AD8418AWBRMZ 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 AD8418AWBRMZ meets industry standards.
7.What is the process for return or replacement of AD8418AWBRMZ?
All AD8418AWBRMZ units undergo pre-shipment inspection (PSI). If there is an issue with AD8418AWBRMZ, 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 AD8418AWBRMZ part is unused and in its original packaging.
Return procedure for AD8418AWBRMZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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