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Analog Devices Inc. AD8418AWBRZ-RL
- Part No.:
- AD8418AWBRZ-RL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AD8418AWBRZ-RL.pdf
- Description:
- IC CURRENT SENSE 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,135
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Product details
Overview
AD8418AWBRZ-RL 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 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 integrated EMI filters - enabling accurate sensing under PWM-switching conditions in 12 V/24 V battery systems.
For engineers reviewing the AD8418AWBRZ-RL datasheet, AD8418AWBRZ-RL pinout, AD8418AWBRZ-RL application, or AD8418AWBRZ-RL equivalent, key selection criteria include bidirectional operation capability, FMEA-tolerant 8-lead SOIC_N package, AEC-Q100 qualification, output offset adjustability via VREF1/VREF2, and robustness against fast common-mode transients up to 1 V/ns.
Technical Context
The AD8418AWBRZ-RL implements a proprietary zero-drift difference amplifier architecture with chopper-stabilized input stage, achieving typical 0.1 μV/°C offset drift and <400 nV/°C drift specification without bandwidth sacrifice. Its dual reference inputs (VREF1, VREF2) enable flexible output offset configuration - including ground-referenced, supply-referenced, external-referenced, and ratiometric mid-scale (VS/2) modes - supporting both unidirectional and bidirectional current sensing.
It integrates patented EMI filtering on both inputs and features internal circuitry that rejects high-slew-rate common-mode transients (e.g., PWM edges), maintaining accuracy even when common-mode voltage changes at 1 V/ns. The device operates from 2.7 V to 5.5 V, draws 4.1 mA quiescent current, and sustains continuous common-mode voltages from −2 V to +70 V with survival up to −3 V to +80 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 20 V/V fixed - enables direct interface to 12-bit ADCs with 100 mV full-scale shunt drop yielding 2 V output swing. |
| Input Offset Voltage (max) | ±200 μV over −40°C to +125°C - ensures ≤1% error at 20 mV differential input across full automotive temperature range. |
| Offset Drift (typ) | 0.1 μV/°C - minimizes thermal-induced measurement drift in engine bay or powertrain environments. |
| Common-Mode Range | −2 V to +70 V continuous - supports high-side sensing in 12 V/24 V systems with load-dump and cold-crank margins. |
| CMRR (min) | 90 dB at DC - rejects battery rail noise and ground bounce in noisy automotive PCB layouts. |
| Small-Signal Bandwidth | 250 kHz - captures fast current transients in BLDC motor commutation and solenoid turn-on/turn-off events. |
| Supply Voltage | 2.7 V to 5.5 V - compatible with standard 3.3 V or 5 V microcontroller domains without level-shifting. |
Pinout & Package
AD8418AWBRZ-RL is supplied in an 8-lead SOIC_N (SOIC-8 narrow-body) package, RoHS-compliant and qualified to AEC-Q100 Grade 1 (−40°C to +125°C). The package features gull-wing leads, 1.27 mm pitch, and JEDEC MS-012-AA outline.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (−IN) | Negative Input | Connects to shunt resistor low-side terminal; forms differential pair with +IN for bidirectional current polarity detection. |
| 2 (GND) | Ground Reference | System ground return path; internal ESD diodes route fault currents here during overvoltage events. |
| 3 (VREF2) | Reference Input 2 | Configures output offset: tied to GND for ground-referenced mode, to VS for supply-referenced mode, or to external reference for precision biasing. |
| 4 (NC) | No Connect | Internally unconnected; must remain floating per datasheet - prevents unintended coupling in FMEA-critical layouts. |
| 5 (OUT) | Analog Output | Buffered, rail-to-rail capable output (0.032 V to VS − 0.032 V); drives 25 kΩ loads directly into MCU ADC or comparator inputs. |
| 6 (VS) | Positive Supply | 2.7 V–5.5 V single supply input; powers internal amplifiers, references, and EMI filters; includes internal PSRR >80 dB. |
| 7 (VREF1) | Reference Input 1 | Paired with VREF2 to set output offset; identical function - either pin can be used alone or both in parallel for improved noise immunity. |
| 8 (+IN) | Positive Input | Connects to shunt resistor high-side terminal; differential voltage across +IN/−IN is amplified 20× and referenced to configured output baseline. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional current sensing | Supports ±50 A measurement with 20 mΩ shunt via symmetric output swing around user-configurable mid-scale point (e.g., VS/2). |
| AEC-Q100 Grade 1 qualification | Validated for automotive powertrain and chassis applications requiring operation from −40°C to +125°C ambient. |
| FMEA-tolerant pinout (SOIC_N) | Includes NC pin between −IN/GND and +IN/VREF1 to prevent short-circuit faults from propagating to critical inputs during PCB manufacturing defects. |
| EMI-filtered inputs | Integrated RC filters suppress RF interference from switching nodes (e.g., IGBT gate drivers), preventing rectification-induced offset errors. |
| PWM common-mode rejection | Maintains accuracy with input common-mode slew rates up to 1 V/ns - essential for accurate phase-current sampling in inverter-driven motors. |
Applications
| Motor Control | Solenoid Control |
|---|---|
|
Use Scenario: Real-time phase current monitoring in 3-phase BLDC motor inverters using high-side shunt resistors. IC Role / Device Role / Timing Role: Current sense amplifier providing isolated, high-bandwidth (250 kHz) analog feedback to MCU ADC for field-oriented control (FOC) loops. Use Value: Enables precise torque regulation and overcurrent protection with <1% total error across temperature, eliminating need for calibration compensation. |
Use Scenario: High-side current sensing in automotive fuel injector or transmission solenoid drivers with low-side PWM switching. IC Role / Device Role / Timing Role: Bidirectional amplifier measuring both energizing and recirculation current paths to detect open/short faults and validate actuator health. Use Value: Detects coil degradation and wiring faults by comparing forward/reverse current symmetry - enabled by ±200 μV offset stability over life. |
| Power Management | Diagnostic Protection |
|
Use Scenario: Battery current monitoring in 12 V/48 V dual-battery architectures with load-dump transient immunity. IC Role / Device Role / Timing Role: High common-mode (−2 V to +70 V) amplifier interfacing shunt to system controller for state-of-charge and load profiling. Use Value: Survives ISO 7637-2 Pulse 5a (load dump) up to +80 V, ensuring uninterrupted current telemetry during alternator regulation faults. |
Use Scenario: Fault-tolerant current supervision in safety-critical valve or brake actuation circuits. IC Role / Device Role / Timing Role: FMEA-optimized SOIC_N variant detecting short-to-battery, short-to-ground, and open-load conditions via bidirectional signature analysis. Use Value: NC pins isolate −IN/+IN from GND/VS, preventing single-point PCB shorts from disabling sensing - certified per ISO 26262 ASIL-B 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, ±150 μV max offset, same −40°C to +150°C grade (AWH), but only in 10-lead MSOP - no SOIC_N option. | Better resolution for low-current (<10 A) sensing; unsuitable where SOIC_N footprint or FMEA NC pin spacing is required. | Select AD8417ARWZ only when higher gain and extended temperature (150°C) outweigh package compatibility needs. |
| INA240A1QDRQ1 | 20 V/V gain, ±100 μV max offset, −40°C to +125°C, 8-pin SOIC, but lacks VREF1/VREF2 offset adjustment and FMEA pinout. | Lower offset improves accuracy at room temperature, but no configurable output baseline limits bidirectional flexibility in asymmetric current ranges. | Choose INA240A1QDRQ1 for cost-sensitive, unidirectional applications where mid-scale offset isn't needed and FMEA isn't mandated. |
Compared with AD8418AWBRZ-RL, AD8417ARWZ offers higher gain and wider temperature range but sacrifices SOIC_N compatibility and FMEA layout resilience, while INA240A1QDRQ1 provides lower initial offset yet omits programmable output referencing - making AD8418AWBRZ-RL uniquely suited for automotive bidirectional sensing with functional safety constraints.
Availability
AD8418AWBRZ-RL is available at Aetrix Electronics and suitable for automotive motor control, solenoid actuation, and battery management systems requiring stable component supply, AEC-Q100 compliance, and long-term lifecycle continuity.
Supply support for AD8418AWBRZ-RL 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, communications, and healthcare markets since 1965.
The AD8418A product line was designed specifically for high-accuracy, high-reliability current sensing in automotive powertrain and chassis systems - emphasizing zero-drift stability, PWM immunity, and functional safety-ready packaging.
FAQ
What is the operating temperature range of the AD8418AWBRZ-RL?
The AD8418AWBRZ-RL is rated for −40°C to +125°C operation and qualified to AEC-Q100 Grade 1. This range covers under-hood automotive environments including engine control units and transmission control modules. The device maintains ±200 μV maximum input offset and 20 V/V gain accuracy across this full span, with typical offset drift of just 0.1 μV/°C - critical for minimizing thermal-induced measurement error in real-world vehicle operation. The AD8418AWBRZ-RL datasheet specifies all parameters within this temperature window.
Does the AD8418AWBRZ-RL support bidirectional current sensing?
Yes, the AD8418AWBRZ-RL natively supports bidirectional current sensing through its dual reference inputs (VREF1 and VREF2). By connecting VREF1 to VS and VREF2 to GND, the output is biased at VS/2 - enabling symmetric positive and negative output swings relative to mid-scale for equal-range measurement of forward and reverse current. This configuration is explicitly validated in the AD8418AWBRZ-RL datasheet for H-bridge motor control and solenoid recirculation current monitoring, with guaranteed performance across −40°C to +125°C.
What package type does the AD8418AWBRZ-RL use, and why is it significant?
The AD8418AWBRZ-RL uses an 8-lead SOIC_N (narrow-body SOIC) package with JEDEC MS-012-AA outline. This package incorporates a failure-mode-and-effects-analysis (FMEA)-optimized pinout: NC pins separate −IN from GND and +IN from VREF1, preventing adjacent-pin shorts from causing catastrophic sensing failure. This layout meets stringent automotive functional safety requirements and is documented in the AD8418AWBRZ-RL datasheet Section "Pinout Option Engineered for FMEA", distinguishing it from standard SOIC variants.
How does the AD8418AWBRZ-RL handle PWM common-mode transients?
The AD8418AWBRZ-RL employs patented circuitry and integrated EMI filters on both inputs to reject fast common-mode transients, sustaining accuracy even with input common-mode slew rates up to 1 V/ns - typical of MOSFET/IGBT switching nodes. Its architecture maintains 90 dB minimum DC CMRR and 86 dB CMRR from DC to 10 kHz, enabling reliable current sampling during PWM dead-time and phase commutation. This behavior is characterized in the AD8418AWBRZ-RL datasheet Figures 19–20 (common-mode step response) and confirmed in motor control application notes.
Can the AD8418AWBRZ-RL be used in high-side current sensing configurations?
Yes, the AD8418AWBRZ-RL is expressly designed for high-side current sensing, supporting continuous common-mode input voltages from −2 V to +70 V - sufficient for 12 V and 24 V automotive battery systems including load-dump transients. Its high common-mode rejection ratio (90 dB min) and zero-drift core ensure stable measurements despite battery rail noise and ground bounce. Application diagrams in the AD8418AWBRZ-RL datasheet (Figures 37–39) validate use in high-side solenoid, motor phase, and battery monitor configurations.
AD8418AWBRZ-RL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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-RL FAQ
1.How can I place an order for AD8418AWBRZ-RL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD8418AWBRZ-RL 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-RL reliable?
The price and inventory of AD8418AWBRZ-RL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD8418AWBRZ-RL is usually 5 days.
3.What payment methods are accepted for AD8418AWBRZ-RL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD8418AWBRZ-RL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD8418AWBRZ-RL?
AD8418AWBRZ-RL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD8418AWBRZ-RL 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-RL?
For technical support, including AD8418AWBRZ-RL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD8418AWBRZ-RL requirements.
6.How does Aetrix verify that AD8418AWBRZ-RL is sourced from the original manufacturer or authorized distributors?
All AD8418AWBRZ-RL 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-RL meets industry standards.
7.What is the process for return or replacement of AD8418AWBRZ-RL?
All AD8418AWBRZ-RL units undergo pre-shipment inspection (PSI). If there is an issue with AD8418AWBRZ-RL, 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-RL part is unused and in its original packaging.
Return procedure for AD8418AWBRZ-RL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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