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Analog Devices Inc. AD8418WBRZ-RL
- Part No.:
- AD8418WBRZ-RL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AD8418WBRZ-RL.pdf
- Description:
- IC CURRENT SENSE 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:11,176
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Product details
Overview
AD8418WBRZ-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 systems. It delivers 20 V/V fixed gain, ±400 µV max input offset over −40°C to +125°C, −2 V to +70 V common-mode input range, 250 kHz bandwidth, and integrated EMI filters. Its SOIC_N package supports robust placement in engine control units and battery management modules.
For engineers reviewing the AD8418WBRZ-RL datasheet, AD8418WBRZ-RL pinout, AD8418WBRZ-RL application, or AD8418WBRZ-RL equivalent, key selection criteria include bidirectional operation capability, PWM-tolerant common-mode rejection up to 1 V/ns, ratiometric output offset adjustment via VREF1/VREF2, and AEC-Q100 qualification for automotive use.
Technical Context
The AD8418WBRZ-RL employs a patented zero-drift architecture achieving <500 nV/°C typical offset drift while maintaining 250 kHz small-signal bandwidth-unlike chopper-stabilized amplifiers that sacrifice speed for precision. Its dual reference inputs (VREF1/VREF2) enable flexible output offset configuration: split-supply connection sets midscale (VS/2) for bidirectional sensing, while external reference tying enables unidirectional or diagnostic rail-referenced outputs.
It integrates matched EMI filters on both inputs to suppress high-frequency noise from PWM switching nodes, and its input stage withstands −4 V to +85 V survival common-mode voltage. The device operates from 2.7 V to 5.5 V, draws 2.6 mA quiescent current over temperature, and maintains 86 dB CMRR from dc to 10 kHz with >90 dB at dc.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 20 V/V fixed-enables direct interface with 12-bit ADCs using 50 mΩ shunts for ±50 A full-scale measurement. |
| Input Offset Voltage (max) | ±400 µV over −40°C to +125°C-limits current measurement error to ≤±20 mA at 50 mΩ shunt, critical for torque accuracy in motor control. |
| 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 PWM edge rates up to 1 V/ns. |
| Bandwidth | 250 kHz typical-captures fast current transients during H-bridge commutation without phase lag affecting closed-loop stability. |
| Supply Voltage Range | 2.7 V to 5.5 V-compatible with standard 3.3 V and 5 V microcontroller domains without level-shifting. |
| CMRR | 86 dB (dc–10 kHz)-rejects noise coupling from adjacent power switches, ensuring clean current feedback in noisy engine bays. |
| Quiescent Current | 2.6 mA over temperature-minimizes self-heating impact on offset drift in sealed ECUs. |
Pinout & Package
AD8418WBRZ-RL is housed in an 8-lead SOIC_N (R-8) package per JEDEC MS-012-AA, with 1.27 mm lead pitch, 5.00 mm × 4.00 mm body, and gull-wing leads suitable for automated optical inspection and reflow soldering.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (−IN) | Negative input terminal | Connects to shunt resistor low-side; differential input pair measures voltage drop across RSHUNT with 20× gain. |
| 2 (GND) | Analog ground reference | Return path for internal circuitry; must be tied to system analog ground near shunt to avoid ground loop errors. |
| 3 (VREF2) | Reference input 2 | Internally connected to 100 kΩ resistor; used with VREF1 to set output offset voltage ratiometrically or externally. |
| 4 (NC) | No connect | Pin 4 is internally unconnected-must remain floating; no trace or pad should attach to this pin. |
| 5 (OUT) | Amplified output | Buffered single-ended output drives ADC input directly; swing is 15 mV to (VS − 20 mV) into 25 kΩ load. |
| 6 (VS) | Positive supply | Accepts 2.7 V to 5.5 V; powers all internal stages and defines output voltage range and reference scaling. |
| 7 (VREF1) | Reference input 1 | Functionally identical to VREF2; pairing both pins to VS/2 sets midscale output for bidirectional current sensing. |
| 8 (+IN) | Positive input terminal | Connects to shunt resistor high-side; completes differential input path with −IN for accurate shunt voltage amplification. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional current sensing | Configurable output offset via VREF1/VREF2 enables symmetric ±IFS measurement without external op amps or level shifters. |
| PWM-tolerant common-mode rejection | Patented input architecture rejects fast common-mode transients (up to 1 V/ns) typical of MOSFET gate drivers, preventing false current readings during switching. |
| Ratiometric output offset adjustment | VREF1/VREF2 divider creates output offset tracking VS changes-ensures stable midscale point across battery voltage fluctuations (e.g., 11.5 V–14.5 V). |
| Automotive-grade reliability | AEC-Q100 qualified (Grade 0: −40°C to +125°C), with −4 V to +85 V survival common-mode rating and 2 kV HBM ESD protection for under-hood deployment. |
| Integrated EMI filtering | On-chip RC filters on both inputs suppress RF interference from ignition systems and DC-DC converters without requiring external components. |
Applications
| Motor Control | Solenoid Control |
|---|---|
Use Scenario: Real-time phase current monitoring in 3-phase BLDC motor drives within electric power steering (EPS) modules. IC Role / Device Role / Timing Role: High-side current sense amplifier measuring shunt voltage with 250 kHz bandwidth to support field-oriented control (FOC) loop rates ≥10 kHz. Use Value: Enables precise torque regulation and overcurrent shutdown within 1 µs of fault detection due to low propagation delay and high CMRR. | Use Scenario: Bidirectional current measurement in automotive transmission solenoid valves with high-side switch topology. IC Role / Device Role / Timing Role: Amplifies shunt voltage across solenoid coil during energize/de-energize cycles, supporting diagnostics for open-circuit, short-to-battery, and short-to-ground faults. Use Value: Delivers ±0.5% full-scale accuracy over temperature, enabling predictive maintenance by detecting coil resistance drift before failure. |
| Power Management | Diagnostic Protection |
Use Scenario: Battery pack current monitoring in 12 V start-stop systems with regenerative braking energy recovery. IC Role / Device Role / Timing Role: Low-drift bidirectional amplifier interfacing with fuel gauge ICs to track charge/discharge coulomb counting with <1 mAh/h error. Use Value: Zero-drift core ensures <±200 µV offset at 85°C, reducing SoC estimation drift by >40% versus conventional amplifiers. | Use Scenario: Real-time overload detection in HVAC blower motor circuits with integrated fast-shutdown signaling. IC Role / Device Role / Timing Role: Provides analog current feedback to MCU while enabling hardware-level overcurrent flag generation via companion comparator (e.g., AD8214). Use Value: Simultaneous analog output and diagnostic readiness reduce BOM count by eliminating separate protection ICs in cost-sensitive modules. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar current sense amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD8210ARZ | Same 20 V/V gain, but wider −12 V to +80 V common-mode range; higher 1.5 mA quiescent current; no VREF pins for offset adjustment. | Preferred for industrial 48 V systems with extended common-mode requirements; lacks ratiometric offset tuning needed for automotive bidirectional sensing. | Select AD8210ARZ only when common-mode exceeds +70 V or −2 V; AD8418WBRZ-RL is superior for AEC-Q100-compliant bidirectional designs. |
| INA240A1QDRQ1 | 20 V/V gain, −4 V to +80 V common-mode, 10 µV/°C max drift, integrated 2.5 V reference; requires external resistors for offset setting. | Offers lower drift than AD8418WBRZ-RL but needs external components for bidirectional offset; not qualified to same AEC-Q100 stress test levels. | Choose INA240A1QDRQ1 if ultra-low drift (<10 µV/°C) is mandatory and layout space allows external resistors; AD8418WBRZ-RL provides simpler, fully integrated automotive solution. |
Compared with AD8210ARZ and INA240A1QDRQ1, AD8418WBRZ-RL uniquely combines AEC-Q100 qualification, on-chip ratiometric offset adjustment, and PWM-tolerant architecture-making it the optimal choice for production automotive motor control where reliability, integration, and transient immunity are non-negotiable.
Availability
AD8418WBRZ-RL is available at Aetrix Electronics and suitable for automotive motor control, solenoid actuation, battery management, and diagnostic protection systems requiring stable component supply across extended temperature and high-noise environments.
Supply support for AD8418WBRZ-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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Wilmington, MA.
The AD8418 product line was engineered specifically for automotive-grade current sensing-delivering zero-drift precision, PWM immunity, and AEC-Q100 compliance to meet stringent functional safety and reliability demands in engine control, transmission, and electrified powertrain systems.
FAQ
What is the operating temperature range for the AD8418WBRZ-RL?
The AD8418WBRZ-RL is rated for −40°C to +125°C operating temperature, fully qualified to AEC-Q100 Grade 0 standards. This range covers under-hood automotive environments including engine control units and transmission control modules. All specifications-including gain error (±0.15%), offset (±400 µV), and CMRR (86 dB)-are guaranteed across this full range, not just at room temperature. The zero-drift architecture ensures minimal performance degradation at extreme temperatures.
Does the AD8418WBRZ-RL support bidirectional current sensing out of the box?
Yes, the AD8418WBRZ-RL supports true bidirectional current sensing without external components. By connecting VREF1 to VS and VREF2 to GND (or vice versa), the output is set to VS/2 at zero differential input-enabling equal positive and negative current measurement ranges. This ratiometric midscale offset remains stable across supply voltage variations, making it ideal for automotive battery voltage fluctuations. The device's symmetric input structure and buffered output ensure linear response in both directions.
How does the AD8418WBRZ-RL handle PWM noise in motor drive applications?
AD8418WBRZ-RL incorporates patented circuitry and integrated EMI filters on both inputs to reject fast common-mode transients up to 1 V/ns-typical of MOSFET switching in H-bridge motor drives. Its architecture maintains 86 dB CMRR from dc to 10 kHz and preserves 250 kHz bandwidth despite PWM edge rates. Unlike standard amplifiers that exhibit output glitches or offset shifts during PWM edges, AD8418WBRZ-RL delivers clean, glitch-free output even when placed directly on high-side shunts adjacent to power switches.
What package type is used for the AD8418WBRZ-RL?
The AD8418WBRZ-RL uses an 8-lead SOIC_N (R-8) package compliant with JEDEC MS-012-AA, measuring 5.00 mm × 4.00 mm with 1.27 mm lead pitch. This narrow-body surface-mount package offers proven reliability in automotive reflow profiles and is compatible with standard AOI and X-ray inspection. Pin 4 is NC (no connect) and must remain unconnected. The "W" suffix confirms AEC-Q100 qualification, and "Z" indicates RoHS compliance.
Can the AD8418WBRZ-RL be used for low-side current sensing?
Yes, AD8418WBRZ-RL supports both high-side and low-side current sensing configurations. In low-side mode, +IN connects to the shunt's load side and −IN to ground, with GND referenced to the system ground plane. Its −2 V to +70 V common-mode range accommodates ground-referenced shunts while rejecting noise from nearby digital circuits. However, high-side sensing is preferred in automotive applications to avoid ground path disturbances and enable comprehensive fault diagnostics including short-to-ground detection.
AD8418WBRZ-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:
- -
- Voltage - Input Offset:
- 200 µV
- Current - Supply:
- 2.6mA
- 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
AD8418WBRZ-RL FAQ
1.How can I place an order for AD8418WBRZ-RL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD8418WBRZ-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 AD8418WBRZ-RL reliable?
The price and inventory of AD8418WBRZ-RL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD8418WBRZ-RL is usually 5 days.
3.What payment methods are accepted for AD8418WBRZ-RL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD8418WBRZ-RL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD8418WBRZ-RL?
AD8418WBRZ-RL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD8418WBRZ-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 AD8418WBRZ-RL?
For technical support, including AD8418WBRZ-RL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD8418WBRZ-RL requirements.
6.How does Aetrix verify that AD8418WBRZ-RL is sourced from the original manufacturer or authorized distributors?
All AD8418WBRZ-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 AD8418WBRZ-RL meets industry standards.
7.What is the process for return or replacement of AD8418WBRZ-RL?
All AD8418WBRZ-RL units undergo pre-shipment inspection (PSI). If there is an issue with AD8418WBRZ-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 AD8418WBRZ-RL part is unused and in its original packaging.
Return procedure for AD8418WBRZ-RL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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