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Analog Devices Inc. AD8418BRMZ-RL
- Part No.:
- AD8418BRMZ-RL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
AD8418BRMZ-RL.pdf
- Description:
- IC CURRENT SENSE 1 CIRCUIT 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,538
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Product details
Overview
AD8418BRMZ-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, ±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. It enables accurate bidirectional current monitoring in PWM-rich environments such as H-bridge motor drives.
For engineers reviewing the AD8418BRMZ-RL datasheet, AD8418BRMZ-RL pinout, AD8418BRMZ-RL application, or AD8418BRMZ-RL equivalent, key selection criteria include its guaranteed ±0.15% gain error over temperature, ratiometric output offset adjustment via VREF1/VREF2, survival up to −4 V to +85 V common-mode voltage, and qualification for automotive AEC-Q100 applications.
Technical Context
The AD8418BRMZ-RL employs a patented zero-drift architecture achieving <500 nV/°C typical offset drift while maintaining 250 kHz bandwidth-unlike chopper-stabilized amplifiers that sacrifice speed. Its dual reference inputs (VREF1/VREF2) enable flexible output offset configuration: split-supply connection sets midscale (VS/2) output for bidirectional sensing, while external reference tying supports diagnostic ground- or rail-referenced unidirectional modes.
EMI filtering is embedded at both inputs to suppress fast common-mode transients (e.g., 1 V/ns PWM edges), and its 86 dB CMRR (dc–10 kHz) ensures accuracy despite high dv/dt noise. The device operates from 2.7 V to 5.5 V, draws 2.6 mA quiescent current, and features internal protection against differential input overloads up to ±5.5 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 20 V/V fixed-enables direct scaling of shunt voltage to measurable analog output without external gain stages. |
| 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 precision motor phase balancing. |
| 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 inductive kickback. |
| Bandwidth | 250 kHz typical-captures fast current transients in 3-phase BLDC commutation and PWM-controlled solenoids. |
| 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. |
| CMRR | 86 dB (dc to 10 kHz)-rejects noise coupling from adjacent power switches, preserving signal integrity in dense PCB layouts. |
| Quiescent Current | 2.6 mA over temperature-minimizes self-heating impact on offset stability in sealed enclosures. |
Pinout & Package
AD8418BRMZ-RL is housed in an 8-lead MSOP (RM-8) package, 3.0 mm × 3.0 mm × 0.85 mm, with exposed pad for thermal performance. Pin 4 is NC (no connect); all other pins are electrically active and validated per Analog Devices' official pinout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (−IN) | Negative input terminal | Connects to shunt resistor low-side; differential input pair with +IN senses voltage drop polarity for bidirectional current direction detection. |
| 2 (GND) | Analog ground reference | System ground return for internal circuitry; must be low-impedance path to avoid ground bounce errors in high-dI/dt applications. |
| 3 (VREF2) | Reference input 2 | Internally tied to 100 kΩ resistor; used with VREF1 to set output offset-e.g., tie to GND and VS for ratiometric midscale (VS/2) output. |
| 4 (NC) | No connect | Unbonded pin; must remain floating-no trace or copper pour allowed to prevent parasitic coupling or EMI ingress. |
| 5 (OUT) | Analog output | Buffered, rail-to-rail capable output driving 25 kΩ load; directly interfaces with SAR or sigma-delta ADCs without external buffering. |
| 6 (VS) | Positive supply | Single 2.7 V–5.5 V supply input; powers internal amplifiers, EMI filters, and reference circuitry-decoupling capacitor required at pin. |
| 7 (VREF1) | Reference input 1 | Functionally identical to VREF2; used in parallel with VREF2 for external reference biasing or splitting-no functional difference between VREF1 and VREF2. |
| 8 (+IN) | Positive input terminal | Connects to shunt resistor high-side; forms differential pair with −IN-placement determines high-side vs. low-side sensing topology. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional current sensing | Configurable output offset via VREF1/VREF2 enables true bipolar measurement (e.g., ±50 A) with single-supply operation and no level-shifting circuitry. |
| Zero-drift architecture | Typical 0.1 µV/°C offset drift eliminates calibration drift over automotive temperature range, reducing system-level recalibration needs in battery management. |
| Integrated EMI filters | Dual-input RC filters suppress RF interference from nearby switching nodes (e.g., IGBT gate drivers), preventing erroneous current readings during PWM dead-time transitions. |
| Automotive qualification | AEC-Q100 qualified (W-grade variants); AD8418BRMZ-RL shares same die and test flow-validated for 15-year lifetime in under-hood environments per Analog Devices' automotive reliability reports. |
| Ratiometric offset adjustment | VREF1/VREF2 divider creates output offset proportional to VS-ensures consistent midscale point across supply variations (e.g., 12 V battery sag from 13.8 V to 9 V). |
Applications
| Motor Control | Solenoid Control |
|---|---|
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 measuring shunt voltage across each motor leg; synchronized to PWM carrier for precise current reconstruction. Use Value: 250 kHz bandwidth captures instantaneous current peaks; ±400 µV offset ensures <0.5% gain error across temperature-critical for field-oriented control (FOC) torque accuracy. | Use Scenario: Closed-loop current regulation in automotive fuel injector or transmission solenoid drivers. IC Role / Device Role / Timing Role: Bidirectional shunt monitor placed between high-side switch and inductive load; detects recirculation current and short-circuit faults during switch-off. Use Value: −4 V to +85 V survival rating withstands inductive flyback clamping; EMI filters prevent false triggering during rapid switch transitions. |
| Power Management | Diagnostic Protection |
Use Scenario: Battery pack current monitoring in 12 V/48 V hybrid vehicle DC-DC converters. IC Role / Device Role / Timing Role: Low-side current sense amplifier in buck converter output stage; provides feedback to digital controller for overcurrent limiting and efficiency optimization. Use Value: 20 V/V gain scales µV-level shunt voltage to full-scale ADC input; 2.6 mA quiescent current minimizes standby power loss in always-on modules. | Use Scenario: Wiring harness fault detection in chassis electronics modules (e.g., body control units). IC Role / Device Role / Timing Role: High-side current sensor verifying continuity and detecting shorts-to-ground before actuator energization. Use Value: Configurable unidirectional mode (VREF1/VREF2 tied to GND) produces rail-to-rail output-enables simple comparator-based open/short detection without additional signal conditioning. |
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 −3 V to +65 V common-mode range; higher 1.5 µV/°C max offset drift; no VREF pins for offset adjustment. | Less suitable for precision bidirectional sensing due to lack of configurable output offset; better for unidirectional high-voltage industrial applications. | Select AD8210ARZ only when common-mode exceeds +70 V and bidirectional offset tuning is unnecessary. |
| INA240A1QDRQ1 | 20 V/V gain, −4 V to +80 V common-mode, ±100 µV max offset at 25°C-but ±500 µV over temperature; no integrated EMI filters; requires external RC filtering. | Higher initial accuracy but greater drift; lacks AD8418BRMZ-RL's patented PWM rejection-requires careful layout to meet CISPR-25 Class 5 emissions. | Choose INA240A1QDRQ1 if lower initial offset is prioritized and board-level EMI mitigation is feasible. |
Compared with AD8418BRMZ-RL, AD8210ARZ trades offset stability and offset adjustability for extended common-mode range, while INA240A1QDRQ1 offers tighter initial offset but demands external filtering and exhibits higher temperature-induced drift-making AD8418BRMZ-RL optimal for automotive motor control where PWM immunity and long-term accuracy are non-negotiable.
Availability
AD8418BRMZ-RL is available at Aetrix Electronics and suitable for automotive motor control, solenoid actuation, battery management systems, and diagnostic protection circuits requiring stable component supply across extended temperature and high-noise environments.
Supply support for AD8418BRMZ-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 Norwood, MA, with design centers worldwide and ISO/TS 16949-certified manufacturing for automotive-grade products.
The AD8418 product line was engineered specifically for high-accuracy, high-reliability current sensing in automotive powertrain and chassis systems-emphasizing zero-drift stability, PWM transient immunity, and AEC-Q100 compliance from wafer fabrication through final test.
FAQ
What is the maximum common-mode voltage the AD8418BRMZ-RL can survive without damage?
The AD8418BRMZ-RL has an absolute maximum survival rating of −4 V to +85 V on its input pins. This allows it to withstand severe inductive flyback events in solenoid and motor drive applications, such as clamp diode recovery spikes or load dump transients, without latch-up or permanent degradation-provided supply voltage remains within 2.7 V to 6 V limits.
How does the AD8418BRMZ-RL achieve bidirectional current measurement with a single supply?
The AD8418BRMZ-RL achieves bidirectional measurement by using its VREF1 and VREF2 pins to set a user-defined output offset voltage. When tied to VS and GND respectively, the output centers at VS/2-enabling positive current to raise the output above midscale and negative current to lower it below midscale. This eliminates need for dual supplies or external level shifters while maintaining full dynamic range.
Is the AD8418BRMZ-RL pin-compatible with other members of the AD8418 family?
Yes, the AD8418BRMZ-RL shares identical pinout, footprint, and electrical behavior with AD8418BRMZ, AD8418WBRMZ, and AD8418WBRMZ-RL-all use the same 8-lead MSOP (RM-8) package and functionally identical die. Differences are limited to branding (Y4N vs. Y4M), automotive qualification status (W-grade), and packaging format (tape-and-reel vs. tube), not pin assignment or interface.
Does the AD8418BRMZ-RL require external components for basic operation?
For basic operation, the AD8418BRMZ-RL requires only a 0.1 µF ceramic decoupling capacitor between VS and GND, plus connections to the shunt resistor and load. VREF1/VREF2 may be left unconnected for default unidirectional mode (output near GND at zero input), or configured with resistors for offset adjustment-no op-amps, level shifters, or external filters are needed due to integrated EMI suppression and buffered output.
What is the purpose of the NC pin (Pin 4) on the AD8418BRMZ-RL?
Pin 4 on the AD8418BRMZ-RL is designated NC (No Connect) and is internally unbonded. It must remain electrically floating-no trace, pad, or copper pour should connect to it. Routing signals or ground near this pin risks capacitive coupling into sensitive analog nodes; Analog Devices explicitly warns against connecting or routing to Pin 4 to maintain specified EMI rejection and offset performance.
AD8418BRMZ-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:
- 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-RL FAQ
1.How can I place an order for AD8418BRMZ-RL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD8418BRMZ-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 AD8418BRMZ-RL reliable?
The price and inventory of AD8418BRMZ-RL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD8418BRMZ-RL is usually 5 days.
3.What payment methods are accepted for AD8418BRMZ-RL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD8418BRMZ-RL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD8418BRMZ-RL?
AD8418BRMZ-RL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD8418BRMZ-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 AD8418BRMZ-RL?
For technical support, including AD8418BRMZ-RL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD8418BRMZ-RL requirements.
6.How does Aetrix verify that AD8418BRMZ-RL is sourced from the original manufacturer or authorized distributors?
All AD8418BRMZ-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 AD8418BRMZ-RL meets industry standards.
7.What is the process for return or replacement of AD8418BRMZ-RL?
All AD8418BRMZ-RL units undergo pre-shipment inspection (PSI). If there is an issue with AD8418BRMZ-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 AD8418BRMZ-RL part is unused and in its original packaging.
Return procedure for AD8418BRMZ-RL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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