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Analog Devices Inc. AD8418BRMZ
- Part No.:
- AD8418BRMZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
AD8418BRMZ.pdf
- Description:
- IC CURRENT SENSE 1 CIRCUIT 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,460
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Product details
Overview
AD8418BRMZ 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 initial 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 MSOP-8 package supports space-constrained PCB layouts in safety-critical power stages.
For engineers reviewing the AD8418BRMZ datasheet, AD8418BRMZ pinout, AD8418BRMZ application, or AD8418BRMZ equivalent, key selection criteria include bidirectional operation capability, PWM-tolerant common-mode rejection up to 1 V/ns, ratiometric output offset adjustability via VREF1/VREF2, and AEC-Q100 qualification for automotive use cases requiring diagnostic accuracy under fast transient conditions.
Technical Context
The AD8418BRMZ employs a patented zero-drift architecture with chopper-stabilized input stage, achieving typical 0.1 µV/°C offset drift and <500 nV/°C drift specification without sacrificing 250 kHz bandwidth. Its dual reference inputs (VREF1/VREF2) enable flexible unidirectional or bidirectional output offset configuration-including ground-referenced, supply-referenced, external-reference, or ratiometric mid-scale setups-without external components.
It integrates matched EMI filters on both inputs and proprietary circuitry to reject fast-rising common-mode transients (e.g., 1 V/ns PWM edges), maintaining 86 dB CMRR from dc to 10 kHz and surviving −4 V to +85 V common-mode voltage extremes. Input bias current remains stable (<130 µA) across −2 V to +70 V common-mode range, supporting accurate sensing in noisy high-voltage rails.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Initial Gain | 20 V/V - fixed precision gain enables direct scaling of shunt voltage to measurable analog output without external gain-setting resistors. |
| Input Offset Voltage (max) | ±400 µV over −40°C to +125°C - ensures ≤20 mV total error at 50 mΩ shunt with 1 A current, critical for low-current diagnostic thresholds. |
| Common-Mode Input Range | −2 V to +70 V continuous - supports high-side sensing in 12 V/24 V/48 V automotive systems with battery transients and load-dump spikes. |
| Small-Signal Bandwidth | 250 kHz - captures fast current transients in motor phase commutation and PWM-controlled solenoids without phase lag. |
| CMRR (dc to 10 kHz) | 86 dB - rejects noise coupling from adjacent high-power switching nodes, preserving signal integrity in dense power modules. |
| Supply Voltage Range | 2.7 V to 5.5 V - compatible with standard 3.3 V and 5 V microcontroller ADC references and logic supplies. |
| Quiescent Current | 2.6 mA over temperature - enables always-on current monitoring in battery-powered ECUs without excessive standby drain. |
Pinout & Package
AD8418BRMZ is housed in an 8-lead MSOP (RM-8) package, 3.0 mm × 3.0 mm × 0.85 mm, with exposed pad for thermal enhancement and RoHS-compliant finish. Pin 1 identifier located at top-left corner; pins 1–4 on top row, 5–8 on bottom row (left-to-right).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (−IN) | Negative input terminal | Connects to shunt resistor low-side; differential input node referenced to +IN for bidirectional current polarity detection. |
| 2 (GND) | Analog ground reference | Primary return path for internal circuitry; must be tied to clean system ground near shunt to avoid ground loop errors. |
| 3 (VREF2) | Reference input 2 | Configures output offset when used with VREF1; tied to VS, GND, or external reference to set unidirectional/bidirectional operating point. |
| 4 (NC) | No connect | Internally unused; must remain floating-no trace or solder connection permitted per datasheet directive. |
| 5 (OUT) | Analog output | Buffered, rail-to-rail capable output driving 25 kΩ load; directly interfaces with SAR or sigma-delta ADC inputs. |
| 6 (VS) | Positive supply | Accepts 2.7 V–5.5 V single supply; powers internal amplifiers, EMI filters, and reference circuitry. |
| 7 (VREF1) | Reference input 1 | Paired with VREF2 to define output offset; identical electrical function-interchangeable in layout. |
| 8 (+IN) | Positive input terminal | Connects to shunt resistor high-side; forms differential pair with −IN to measure voltage drop across shunt. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional current sensing | Supports full-range measurement of forward and reverse current through same shunt resistor, enabling H-bridge motor control and regenerative braking diagnostics. |
| Ratiometric output offset adjustment | VREF1/VREF2 pins allow precise setting of output DC level (e.g., VS/2 for bidirectional mode) that tracks supply voltage changes, eliminating need for stable external reference. |
| EMI-filtered inputs | Integrated RC filters suppress RF interference from nearby switching MOSFETs or inverters, reducing post-ADC filtering requirements and improving EMC robustness. |
| PWM common-mode rejection | Patented architecture rejects fast common-mode edges up to 1 V/ns, ensuring accurate current sampling during active PWM gate drive without distortion or recovery delay. |
| AEC-Q100 qualified | Qualified for automotive Grade 1 (−40°C to +125°C), including HTOL, TC, and ESD testing-meets functional safety requirements for ASIL-B motor control subsystems. |
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 measuring shunt voltage with 250 kHz bandwidth and <1 µs overload recovery to capture instantaneous current peaks during commutation. Use Value: Enables precise field-oriented control (FOC) and overcurrent shutdown within 100 ns when paired with AD8214 comparator, preventing IGBT damage during short circuits. | Use Scenario: High-side current sensing in 12 V automotive fuel injector drivers with low-side MOSFET switch. IC Role / Device Role / Timing Role: Bidirectional amplifier capturing both energizing and recirculation currents across shunt, rejecting clamp diode-induced common-mode transients during switch-off. Use Value: Detects open-circuit, short-to-ground, and partial winding faults by analyzing current waveform asymmetry-improving OBD-II diagnostic coverage. |
| Power Management | Diagnostic Protection |
Use Scenario: Battery current monitoring in 48 V mild-hybrid vehicle DC-DC converters. IC Role / Device Role / Timing Role: Low-drift (±400 µV max) amplifier measuring bidirectional charge/discharge current across 0.5 mΩ shunt, interfacing with isolated ADC via reinforced insulation barrier. Use Value: Achieves ≤0.5% full-scale current measurement error over lifetime, supporting accurate state-of-charge (SoC) estimation and thermal derating algorithms. | Use Scenario: Real-time wire-break and short-circuit detection in electric power steering (EPS) motor phases. IC Role / Device Role / Timing Role: Zero-drift amplifier providing stable baseline output during zero-current conditions, enabling reliable threshold comparison for fault flag generation. Use Value: Reduces false positives in safety-critical EPS systems by maintaining <10 µV effective offset drift over temperature and time, meeting ISO 26262 ASIL-C 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 |
|---|---|---|---|
| AD8207ARZ | Same 20 V/V gain, but SOIC-8 only; ±200 µV max offset (tighter spec), no VREF pins-fixed unidirectional output. | Limited to unidirectional sensing; lacks programmable offset and bidirectional capability required for H-bridge or regenerative systems. | Select AD8207ARZ only if unidirectional measurement suffices and MSOP footprint is not required. |
| INA240A1QDRQ1 | 20 V/V gain, −4 V to +80 V common-mode, ±100 µV max offset, but requires external gain-resistor network and no integrated EMI filters. | Higher precision offset but increased BOM count and layout sensitivity; less robust against high-frequency noise in engine bay environments. | Choose INA240A1QDRQ1 when ultra-low offset is mandatory and board area allows discrete filter implementation. |
Compared with AD8418BRMZ, AD8207ARZ offers tighter offset but sacrifices bidirectionality and package flexibility, while INA240A1QDRQ1 provides lower offset and wider common-mode range at the cost of added external components and reduced EMI immunity-making AD8418BRMZ optimal for compact, PWM-noise-prone automotive motor control where integrated features reduce design risk.
Availability
AD8418BRMZ is available at Aetrix Electronics and suitable for motor control, solenoid actuation, and battery management systems requiring stable component supply, automotive-grade reliability, and long-term lifecycle support.
Supply support for AD8418BRMZ 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 AD8418 product line delivers precision current sensing ICs engineered specifically for demanding automotive powertrain and chassis applications, emphasizing zero-drift stability, PWM noise immunity, and AEC-Q100 compliance.
FAQ
What is the maximum common-mode voltage the AD8418BRMZ can survive during transient events?
The AD8418BRMZ survives common-mode voltages from −4 V to +85 V under transient conditions, exceeding its continuous operating range of −2 V to +70 V. This survival rating accommodates automotive load-dump spikes and cold-crank battery dips without latch-up or permanent damage, as verified in AEC-Q100 stress testing.
Can the AD8418BRMZ operate with a 3.3 V supply while maintaining full performance specifications?
Yes, the AD8418BRMZ operates across 2.7 V to 5.5 V, and all key specs-including 20 V/V gain, ±400 µV max offset, and 250 kHz bandwidth-are guaranteed at 3.3 V. Quiescent current remains 2.6 mA, and output swing extends to within 15 mV of rails, ensuring compatibility with 3.3 V microcontroller ADCs.
How does the AD8418BRMZ achieve bidirectional current measurement without external components?
The AD8418BRMZ achieves bidirectional measurement by applying a mid-scale reference voltage (e.g., VS/2) to both VREF1 and VREF2 pins, setting the output at half-supply when differential input is zero. Current flow in either direction shifts the output linearly above or below this midpoint, using only internal resistive division-no external op amps or DACs required.
Is the AD8418BRMZ pin-compatible with other members of the AD8418 family, such as AD8418WBRMZ?
Yes, AD8418BRMZ and AD8418WBRMZ share identical MSOP-8 (RM-8) pinout, footprint, and electrical interface. The "W" suffix denotes automotive qualification with enhanced reliability testing, but mechanical and functional compatibility is maintained-allowing drop-in replacement in designs requiring AEC-Q100 compliance.
What is the purpose of the NC pin (Pin 4) on the AD8418BRMZ, and can it be grounded?
Pin 4 is designated NC (No Connect) and must remain unconnected-neither grounded nor tied to any net. Internal circuitry leaves this pin electrically floating; connecting it risks altering internal bias points or degrading EMI performance, violating the absolute maximum ratings and voiding AEC-Q100 qualification for AD8418BRMZ.
AD8418BRMZ 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:
- 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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MSOP
AD8418BRMZ FAQ
1.How can I place an order for AD8418BRMZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD8418BRMZ 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 AD8418BRMZ reliable?
The price and inventory of AD8418BRMZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD8418BRMZ is usually 5 days.
3.What payment methods are accepted for AD8418BRMZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD8418BRMZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD8418BRMZ?
AD8418BRMZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD8418BRMZ 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 AD8418BRMZ?
For technical support, including AD8418BRMZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD8418BRMZ requirements.
6.How does Aetrix verify that AD8418BRMZ is sourced from the original manufacturer or authorized distributors?
All AD8418BRMZ 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 AD8418BRMZ meets industry standards.
7.What is the process for return or replacement of AD8418BRMZ?
All AD8418BRMZ units undergo pre-shipment inspection (PSI). If there is an issue with AD8418BRMZ, 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 AD8418BRMZ part is unused and in its original packaging.
Return procedure for AD8418BRMZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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