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Analog Devices Inc. AD8418AWBRZ
- Part No.:
- AD8418AWBRZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AD8418AWBRZ.pdf
- Description:
- IC CURRENT SENSE 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,417
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Product details
Overview
AD8418AWBRZ 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 fixed gain, ±200 μV max input offset over −40°C to +125°C, 90 dB min DC CMRR, −2 V to +70 V continuous common-mode input range, and 250 kHz bandwidth - enabling accurate real-time current monitoring under PWM switching conditions.
For engineers reviewing the AD8418AWBRZ datasheet, AD8418AWBRZ pinout, AD8418AWBRZ application, or AD8418AWBRZ equivalent, this page provides verified technical context, package-specific pin definitions, design-meaningful specifications, automotive-grade FMEA-tolerant operation details, and validated alternative options for motor control, solenoid diagnostics, and power management systems.
Technical Context
The AD8418AWBRZ implements a proprietary zero-drift architecture achieving 0.1 μV/°C typical offset drift and <400 nV/°C max drift across −40°C to +125°C, without sacrificing 250 kHz bandwidth. Its dual EMI filters and patented circuitry reject fast-rising 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 output offset via VREF1/VREF2 pins - enabling ground-referenced, supply-referenced, external-referenced, or ratiometric mid-scale (VS/2) operation. The device is AEC-Q100 qualified and offered in an 8-lead SOIC_N package with FMEA-optimized internal pin spacing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 20 V/V fixed - enables direct interface with 12-bit ADCs using 50 mΩ shunts at ±50 A full scale. |
| Input Offset Voltage (max) | ±200 μV over −40°C to +125°C - ensures ≤±10 mV total output error at 20× gain, critical for <1% current measurement accuracy. |
| Common-Mode 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) | 90 dB at dc - rejects supply noise and ground bounce in noisy motor drive environments. |
| Bandwidth | 250 kHz - captures fast current transients during PWM edge transitions and fault events. |
| Supply Range | 2.7 V to 5.5 V - compatible with standard 3.3 V and 5 V microcontroller domains without level-shifting. |
| Quiescent Current | 4.1 mA at −40°C to +125°C - enables always-on diagnostic monitoring in low-power vehicle modules. |
Pinout & Package
AD8418AWBRZ is supplied in an 8-lead SOIC_N (Small Outline Integrated Circuit, Narrow) package per JEDEC MS-012-AA, with 1.27 mm pitch and 4.9 mm × 3.9 mm body size. This variant uses the standard 8-lead SOIC pinout (not the 10-lead MSOP FMEA option).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (−IN) | Negative Input | Connects to shunt resistor low-side; differential input node for bidirectional current polarity detection. |
| 2 (GND) | Ground Reference | Primary return path for internal circuitry and output stage; must be tied to system power ground. |
| 3 (VREF2) | Reference Input 2 | Configures output offset voltage; tied to GND, VS, or external reference to set unidirectional/bidirectional operating point. |
| 4 (NC) | No Connect | Internally unconnected; must remain floating - no PCB trace or solder joint allowed. |
| 5 (OUT) | Amplified Output | Buffered 20× amplified shunt voltage; drives 25 kΩ loads directly; rail-to-rail swing (0.032 V to VS − 0.032 V). |
| 6 (VS) | Positive Supply | Accepts 2.7 V–5.5 V single supply; powers internal amplifiers, EMI filters, and output stage. |
| 7 (VREF1) | Reference Input 1 | Paired with VREF2 to define output offset; identical function and electrical behavior to VREF2. |
| 8 (+IN) | Positive Input | Connects to shunt resistor high-side; completes differential pair for current direction and magnitude sensing. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional current sensing | Enables single-device measurement of forward/reverse motor or solenoid current without external polarity switching. |
| AEC-Q100 qualified (Grade 1) | Validated for −40°C to +125°C operation with lifetime reliability testing per automotive stress standards. |
| EMI-filtered inputs | Integrated RC filters suppress RF interference from nearby switching nodes, eliminating need for external ferrites or capacitors. |
| PWM common-mode rejection | Maintains accuracy under fast-rising (1 V/ns) common-mode transients typical in H-bridge and 3-phase inverter applications. |
| Ratiometric output offset control | VREF1/VREF2 configuration allows VS/2 mid-scale output that tracks supply variation - simplifies ADC reference alignment. |
Applications
| Motor Phase Current Monitoring | Solenoid Diagnostic Protection |
|---|---|
|
Use Scenario: Real-time phase current sampling in 3-phase BLDC motor drives with space-vector PWM modulation. IC Role / Device Role / Timing Role: High-side current sense amplifier providing isolated, low-drift analog feedback to MCU ADC at 10–20 kHz update rates. Use Value: Enables precise field-oriented control (FOC) and overcurrent shutdown within 1 µs of fault onset due to 250 kHz bandwidth and fast overload recovery. |
Use Scenario: High-side current monitoring for 12 V automotive solenoids controlling transmission valves or fuel injectors. IC Role / Device Role / Timing Role: Bidirectional shunt amplifier detecting both activation current and recirculation current during switch-off. Use Value: Identifies open-circuit, short-to-ground, and stuck-on faults by analyzing current decay profile and polarity reversal - no additional sensors required. |
| H-Bridge Bidirectional Drive | High-Rail Power Management |
|
Use Scenario: Current sensing in center-tap H-bridge configurations for reversible DC motors in power seats or HVAC actuators. IC Role / Device Role / Timing Role: Differential amplifier placed across shunt in bridge midpoint to measure net current flow regardless of direction. Use Value: Eliminates ground-reference errors caused by PCB trace IR drop and chassis potential shifts - improves torque consistency across temperature. |
Use Scenario: Battery current monitoring in 48 V mild-hybrid starter-generator control units with high common-mode voltage. IC Role / Device Role / Timing Role: High-voltage current sense amplifier converting battery-side shunt voltage to ground-referenced analog output. Use Value: Supports ISO 26262 ASIL-B functional safety by delivering stable, drift-compensated current data for energy accounting and thermal derating algorithms. |
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; no integrated EMI filters. | Better resolution for low-current (<10 A) sensing; less robust in high-EMI motor inverter environments. | Select AD8417ARWZ when higher gain is needed and board-level EMI filtering is already implemented. |
| INA240A1D | 20 V/V gain, −4 V to +80 V common-mode, 120 dB CMRR, but only −40°C to +125°C rating and no AEC-Q100 certification. | Superior CMRR for precision industrial power supplies; lacks automotive qualification and FMEA-optimized layout support. | Choose INA240A1D for non-automotive industrial systems requiring ultra-high CMRR and extended survival range. |
Compared with AD8418AWBRZ, AD8417ARWZ trades EMI resilience for higher gain and lower offset, while INA240A1D offers broader common-mode tolerance and CMRR but omits automotive qualification and integrated EMI filtering - making AD8418AWBRZ the optimal choice for AEC-Q100-compliant motor/solenoid control where PWM noise immunity and failure-mode robustness are mandatory.
Availability
AD8418AWBRZ is available at Aetrix Electronics and suitable for automotive motor control, solenoid actuation, and high-side power management applications requiring stable component supply, long-term lifecycle support, and AEC-Q100 compliance.
Supply support for AD8418AWBRZ 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.
The AD8418A product line is designed specifically for high-accuracy, high-reliability current sensing in automotive powertrain and chassis systems - emphasizing zero-drift stability, PWM transient immunity, and AEC-Q100 qualification from inception.
FAQ
What is the maximum continuous common-mode voltage for AD8418AWBRZ?
The AD8418AWBRZ supports −2 V to +70 V continuous common-mode input voltage, with −3 V to +80 V survival rating. This enables reliable operation in 12 V and 24 V automotive systems during load dump, cold crank, and inductive kickback events without external protection circuitry.
Does AD8418AWBRZ require external components for EMI suppression?
No. AD8418AWBRZ integrates on-chip EMI filters on both input pins, eliminating the need for external RC networks or ferrite beads in most automotive motor and solenoid applications - reducing BOM count and PCB area while maintaining >86 dB CMRR up to 10 kHz.
How is bidirectional operation configured on AD8418AWBRZ?
Bidirectional operation on AD8418AWBRZ is achieved by applying complementary voltages to VREF1 and VREF2 - typically tying VREF1 to VS and VREF2 to GND to set the output at VS/2 (mid-scale) for equal positive/negative current range. The device's zero-drift core ensures minimal offset shift across temperature during bidirectional use.
Is AD8418AWBRZ pin-compatible with other AD8418 variants?
Yes. AD8418AWBRZ (8-lead SOIC_N) shares identical pinout and electrical characteristics with AD8418AWBRMZ (8-lead MSOP) and AD8418AWHRZ (10-lead MSOP FMEA variant), except that pins 2 and 4 in the 10-lead version are NC - requiring layout adaptation only for the FMEA option.
What is the output drive capability of AD8418AWBRZ?
AD8418AWBRZ delivers ±20 mA output source/sink current at room temperature, supporting direct connection to 25 kΩ ADC inputs or op-amp buffers. Its 2 Ω output resistance and 500 pF max capacitive load tolerance ensure stable operation into typical sampling circuits without external isolation.
AD8418AWBRZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm 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-SOIC
AD8418AWBRZ FAQ
1.How can I place an order for AD8418AWBRZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD8418AWBRZ 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 AD8418AWBRZ reliable?
The price and inventory of AD8418AWBRZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD8418AWBRZ is usually 5 days.
3.What payment methods are accepted for AD8418AWBRZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD8418AWBRZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD8418AWBRZ?
AD8418AWBRZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD8418AWBRZ 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 AD8418AWBRZ?
For technical support, including AD8418AWBRZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD8418AWBRZ requirements.
6.How does Aetrix verify that AD8418AWBRZ is sourced from the original manufacturer or authorized distributors?
All AD8418AWBRZ 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 AD8418AWBRZ meets industry standards.
7.What is the process for return or replacement of AD8418AWBRZ?
All AD8418AWBRZ units undergo pre-shipment inspection (PSI). If there is an issue with AD8418AWBRZ, 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 AD8418AWBRZ part is unused and in its original packaging.
Return procedure for AD8418AWBRZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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