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Analog Devices Inc. AD8418AWHRMZ-RL
- Part No.:
- AD8418AWHRMZ-RL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
AD8418AWHRMZ-RL.pdf
- Description:
- IC CURRENT SENSE 1 CIRCUIT 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,792
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Product details
Overview
AD8418AWHRMZ-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 controls. It delivers 20 V/V fixed gain, ±200 μV max input offset over −40°C to +150°C, −2 V to +70 V continuous common-mode input range, and 250 kHz bandwidth with EMI filtering. Its FMEA-tolerant 10-lead MSOP package supports AEC-Q100-compliant safety-critical systems.
For engineers reviewing the AD8418AWHRMZ-RL datasheet, AD8418AWHRMZ-RL pinout, AD8418AWHRMZ-RL application, or AD8418AWHRMZ-RL equivalent, key selection criteria include bidirectional operation capability, PWM common-mode rejection up to 1 V/ns, ratiometric output offset adjustment, thermal stability at 150°C, and FMEA-optimized pin layout for fault-tolerant PCB design.
Technical Context
The AD8418AWHRMZ-RL employs a proprietary zero-drift architecture achieving 0.1 μV/°C typical offset drift and <400 nV/°C max drift across −40°C to +150°C. Its differential input stage rejects fast-changing PWM common-mode voltages (−2 V to +70 V) without degradation, enabled by integrated EMI filters and patented circuitry.
It features dual reference inputs (VREF1/VREF2) that enable flexible output offset configuration-ground-referenced, supply-referenced, external-referenced, or ratiometric mid-scale (VS/2)-with 0.5% divider accuracy. The device operates from 2.7 V to 5.5 V and delivers rail-to-rail output swing into 25 kΩ loads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 20 V/V fixed, ±0.15% error over full temperature range - ensures consistent current-to-voltage scaling without calibration. |
| Input Offset Voltage | ±200 μV max over −40°C to +150°C - enables accurate sub-milliohm shunt sensing with minimal zero-current error. |
| Common-Mode Range | −2 V to +70 V continuous - supports direct high-side sensing on 12 V/24 V automotive rails with battery transients. |
| Bandwidth | 250 kHz small-signal −3 dB - captures fast motor phase current transitions and PWM switching artifacts. |
| Supply Range | 2.7 V to 5.5 V - compatible with standard 3.3 V and 5 V microcontroller ADC interfaces. |
| Temperature Range | −40°C to +150°C - qualified for under-hood automotive applications including engine control and transmission modules. |
| CMRR | 90 dB min (dc), 86 dB (dc–10 kHz) - maintains accuracy despite ground bounce and switching noise in noisy power stages. |
Pinout & Package
AD8418AWHRMZ-RL is housed in a RoHS-compliant, AEC-Q100-qualified 10-lead MSOP package (3.0 mm × 3.0 mm, 0.5 mm pitch) engineered for FMEA compliance. NC pins isolate high-voltage inputs (−IN, +IN) from adjacent GND and VREF1 pins to mitigate single-point PCB short faults.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (−IN) | Negative Input | Connects to shunt resistor low-side; accepts −2 V to +70 V common-mode voltage. |
| 2, 5, 9 (NC) | No Connect | FMEA isolation barriers-physically separate −IN/GND and +IN/VREF1 to prevent fault propagation. |
| 3 (GND) | Analog Ground | Reference for internal circuitry; not tied to shunt ground-enables true high-side sensing. |
| 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, rail-to-rail voltage output (0.032 V to VS − 0.032 V); drives 25 kΩ loads directly. |
| 7 (VS) | Positive Supply | 2.7 V to 5.5 V single supply; powers internal amplifiers and reference circuitry. |
| 8 (VREF1) | Reference Input 1 | Paired with VREF2 for ratiometric mid-scale (VS/2) or external reference division with 0.5% accuracy. |
| 10 (+IN) | Positive Input | Connects to shunt resistor high-side; completes differential measurement path with −IN. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional current sensing | Output swings symmetrically around user-configurable zero-current point (e.g., VS/2), enabling forward/reverse motor current detection. |
| FMEA-optimized 10-lead MSOP | NC pins between −IN/GND and +IN/VREF1 prevent catastrophic failure from adjacent trace shorts-certified for ASIL-B systems. |
| PWM common-mode rejection | Stable operation with >1 V/ns common-mode dV/dt transients-critical for accurate sampling during gate drive switching edges. |
| Ratiometric output offset | VREF1/VREF2 divider sets output at VS/2 with 0.5% accuracy; eliminates need for precision external references in bidirectional setups. |
| AEC-Q100 Grade 0 qualification | Validated for −40°C to +150°C operation with 1000-hour HTOL and ESD ≥2 kV HBM-meets automotive powertrain requirements. |
Applications
| Motor Phase Current Monitoring | Solenoid Diagnostic Protection |
|---|---|
|
Use Scenario: Real-time current sampling in 3-phase inverter legs for field-oriented control (FOC) and overcurrent shutdown. IC Role / Device Role / Timing Role: High-side current sense amplifier providing isolated, low-drift analog feedback to MCU ADC with 250 kHz bandwidth. Use Value: Enables precise torque control and <100 ns fault response when paired with fast comparators like AD8214-reducing IGBT damage risk. |
Use Scenario: High-side current monitoring of 12 V/24 V solenoid valves with recirculation path diagnostics. IC Role / Device Role / Timing Role: Bidirectional shunt amplifier measuring both actuation and flyback currents in valve driver circuits. Use Value: Detects open-circuit, short-to-ground, and coil degradation via asymmetry in forward/reverse current profiles. |
| H-Bridge Bidirectional Drive | Automotive Power Management |
|
Use Scenario: Center-shunt current sensing in H-bridge motor drivers for electric power steering (EPS) and HVAC blowers. IC Role / Device Role / Timing Role: Zero-drift amplifier referenced to VS/2 output, rejecting ground noise while resolving ±50 A bidirectional flow. Use Value: Eliminates need for dual amplifiers or complex level-shifting-reduces BOM count and improves thermal tracking. |
Use Scenario: Battery current monitoring in 12 V DC-DC converters and junction box fuseless protection modules. IC Role / Device Role / Timing Role: High-CMRR current sense front-end feeding isolated sigma-delta ADCs for energy accounting and load shedding. Use Value: Maintains ±0.5% full-scale accuracy across vehicle life despite under-hood temperature cycling and EMI exposure. |
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-R7 | 60 V/V gain, ±150 μV max offset, same 10-lead MSOP package but no FMEA pinout; −40°C to +125°C rating. | Higher gain suits smaller shunts (<1 mΩ); limited to under-hood ambient ≤125°C; lacks NC pin isolation for ASIL-B. | Select AD8417ARWZ-R7 only if higher gain is required and FMEA compliance is not mandated. |
| INA240A1QPWRQ1 | 20 V/V gain, −4 V to +80 V CM range, 10 ppm/°C gain drift (vs. ±5 ppm/°C), SOIC-8 package, no ratiometric VREF option. | Broadest CM range supports 48 V systems; lacks programmable offset and FMEA layout-requires external resistive divider for bidirectional mode. | Choose INA240A1QPWRQ1 for 48 V commercial EV subsystems where mid-scale offset is implemented externally. |
Compared with AD8418AWHRMZ-RL, AD8417ARWZ-R7 trades FMEA robustness and 150°C operation for higher gain, while INA240A1QPWRQ1 extends common-mode range but requires external circuitry for bidirectional offset-making AD8418AWHRMZ-RL optimal for AEC-Q100 ASIL-B motor control where integrated ratiometric offset and fault tolerance are critical.
Availability
AD8418AWHRMZ-RL is available at Aetrix Electronics and suitable for automotive motor control, solenoid diagnostic protection, and high-reliability power management requiring stable component supply across extended temperature and long product lifecycles.
Supply support for AD8418AWHRMZ-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 industrial, automotive, communications, and healthcare markets since 1965.
The AD8418A product line was designed specifically for AEC-Q100-compliant current sensing in safety-critical automotive power stages-including EPS, transmission control, and battery management-where zero-drift accuracy and PWM noise immunity are non-negotiable.
FAQ
What is the maximum continuous common-mode voltage the AD8418AWHRMZ-RL can withstand?
The AD8418AWHRMZ-RL supports −2 V to +70 V continuous common-mode input voltage, with survival capability up to −3 V to +80 V. This allows direct connection to 12 V and 24 V automotive battery rails, including cranking transients and load-dump events, without external attenuation or protection circuitry.
How does the AD8418AWHRMZ-RL achieve bidirectional current measurement?
The AD8418AWHRMZ-RL achieves bidirectional measurement by configuring its VREF1 and VREF2 pins to set the output voltage at mid-supply (VS/2) when differential input is zero. Current flow in either direction shifts the output linearly above or below VS/2, enabling full-scale resolution for both forward and reverse current with a single device.
Is the AD8418AWHRMZ-RL pin-compatible with other members of the AD8418A family?
No-AD8418AWHRMZ-RL uses the 10-lead MSOP FMEA-optimized pinout (with NC pins at positions 2, 5, 9), whereas AD8418AWBRMZ-RL and AD8418ABRMZ-RL use the standard 8-lead MSOP/SOIC_N layout. PCB layout must be redesigned to accommodate the additional NC pins and repositioned terminals.
What is the purpose of the NC pins in the AD8418AWHRMZ-RL package?
The NC pins in the AD8418AWHRMZ-RL serve as physical isolation barriers between high-voltage inputs (−IN, +IN) and adjacent functional pins (GND, VREF1). They prevent fault propagation in case of PCB trace shorts-ensuring the device remains operational or fails safely per ISO 26262 ASIL-B requirements.
Can the AD8418AWHRMZ-RL operate with a 3.3 V supply?
Yes-the AD8418AWHRMZ-RL operates from 2.7 V to 5.5 V, making it fully compatible with 3.3 V systems. At 3.3 V supply, its output swings from 32 mV to 3.268 V (rail-to-rail minus 32 mV), and its ratiometric VREF divider still sets mid-scale at 1.65 V with 0.5% accuracy-ideal for interfacing with 3.3 V ADCs.
AD8418AWHRMZ-RL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm 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 ~ 150°C
- Grade:
- Automotive
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MSOP
AD8418AWHRMZ-RL FAQ
1.How can I place an order for AD8418AWHRMZ-RL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD8418AWHRMZ-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 AD8418AWHRMZ-RL reliable?
The price and inventory of AD8418AWHRMZ-RL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD8418AWHRMZ-RL is usually 5 days.
3.What payment methods are accepted for AD8418AWHRMZ-RL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD8418AWHRMZ-RL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD8418AWHRMZ-RL?
AD8418AWHRMZ-RL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD8418AWHRMZ-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 AD8418AWHRMZ-RL?
For technical support, including AD8418AWHRMZ-RL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD8418AWHRMZ-RL requirements.
6.How does Aetrix verify that AD8418AWHRMZ-RL is sourced from the original manufacturer or authorized distributors?
All AD8418AWHRMZ-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 AD8418AWHRMZ-RL meets industry standards.
7.What is the process for return or replacement of AD8418AWHRMZ-RL?
All AD8418AWHRMZ-RL units undergo pre-shipment inspection (PSI). If there is an issue with AD8418AWHRMZ-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 AD8418AWHRMZ-RL part is unused and in its original packaging.
Return procedure for AD8418AWHRMZ-RL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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