AD8418WBRZ-RL - Bidirectional Zero-Drift Current Sense Amp | ADI
MPN: AD8418WBRZ-RL ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1.21 | $1.21 |
| 10 | $1.15 | $11.50 |
| 100 | $1.05 | $105.00 |
| 500 | $0.95 | $475.00 |
| 1,000 | $0.85 | $850.00 |
Drop-in alternatives for AD8418WBRZ-RL — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
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AD8418WBRZ
✅ Drop-In📋 Reference alternative (not in catalog)
AD8418BRZ
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INA240A1DR
✅ Drop-In📋 Reference alternative (not in catalog)
INA240A2DR
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AD8418WBRZ-RL Maximum Ratings & Electrical Characteristics
| Type | Current Sense Amplifier |
| Number of Channels | 1 |
| Gain | 20 V/V |
| Gain Error (max) | ±0.15% |
| Common-Mode Input Range | -2 V to +70 V |
| Supply Voltage Range | 2.75 V to 5.5 V |
| Bandwidth | 250 kHz |
| Offset Voltage (max) | ±50 µV |
| Offset Drift | ±1 ppm/°C |
| Supply Current (typical) | 4.1 mA |
| Operating Temperature Range | -40°C to +125°C |
| Package | 8-SOIC |
| Mounting Type | Surface Mount |
| Qualification | AEC-Q100 |
| RoHS | Compliant |
AD8418WBRZ-RL Pin Configuration
| Pin 1 | VS — Positive supply voltage |
| Pin 2 | OUT — Amplifier output |
| Pin 3 | REF1 — Reference input 1 |
| Pin 4 | REF2 — Reference input 2 |
| Pin 5 | GND — Ground |
| Pin 6 | IN- — Inverting input (shunt negative terminal) |
| Pin 7 | IN+ — Non-inverting input (shunt positive terminal) |
| Pin 8 | NC — No connect |
Safe Operating Area (SOA) & Thermal Characteristics
No official SOA curve available for this component. Always operate within absolute maximum ratings specified in the datasheet. Ensure adequate cooling and derate as needed.
Typical Applications
AD8418WBRZ-RL is suitable for 6 applications: Automotive Motor Control, Solenoid Control, Battery Management, Power Supply Monitoring, Industrial Process Control, Test and Measurement.
Automotive Motor Control
The AD8418WBRZ-RL is ideal for motor control in automotive systems, such as electric power steering and HVAC blowers. Its wide common-mode range of -2V to +70V allows high-side sensing on 12V and 24V rails, while the zero-drift architecture ensures accurate current measurement over temperature. The AEC-Q100 qualification guarantees reliability in harsh automotive environments. The 250 kHz bandwidth enables fast response for closed-loop control, and the fixed gain of 20 V/V simplifies design by eliminating external resistors.
Recommended
Solenoid Control
In solenoid control applications, the AD8418WBRZ-RL provides precise current sensing to regulate the solenoid force. Its high common-mode voltage range allows sensing on the high side of the solenoid, while the zero-drift offset ensures accurate low-current measurement. The device's fast bandwidth supports PWM control frequencies up to 250 kHz, and the reference pins enable level shifting for bidirectional current sensing. This makes it suitable for proportional valves and injectors in industrial and automotive systems.
Recommended
Battery Management
The AD8418WBRZ-RL is used in battery management systems to monitor charge and discharge currents. Its bidirectional sensing capability allows measurement of both charging and discharging currents with a single device. The wide common-mode range accommodates battery voltages up to 70V, and the low offset voltage ensures accurate state-of-charge estimation. The device's low supply current of 4.1 mA minimizes power consumption, making it suitable for battery-powered applications. The AEC-Q100 qualification is beneficial for automotive battery management.
Recommended
Power Supply Monitoring
In power supply monitoring, the AD8418WBRZ-RL senses load current to detect overcurrent conditions and monitor power consumption. Its high common-mode range allows sensing on the output of a DC-DC converter, while the zero-drift architecture provides accurate measurement over a wide temperature range. The device's small SOIC package is ideal for space-constrained designs, and the fixed gain simplifies calibration. The 250 kHz bandwidth enables fast overcurrent detection, protecting the power supply and load.
Recommended
Industrial Process Control
The AD8418WBRZ-RL is suitable for industrial process control, such as monitoring current in actuators and heaters. Its wide common-mode range and high accuracy make it ideal for 4-20 mA loop monitoring and motor current sensing. The device's robustness and wide temperature range of -40°C to +125°C ensure reliable operation in harsh industrial environments. The zero-drift feature minimizes offset drift, reducing the need for calibration. The SOIC package is easy to integrate into existing PCB designs.
Recommended
Test and Measurement
In test and measurement equipment, the AD8418WBRZ-RL provides accurate current sensing for load testing and power analysis. Its high common-mode range and low offset voltage enable precise measurement of small currents in the presence of large supply voltages. The device's bandwidth of 250 kHz supports dynamic current profiling, and the fixed gain simplifies scaling. The SOIC package is compatible with standard test fixtures, and the AEC-Q100 qualification ensures high reliability for demanding applications.
Recommended
Recommended Products Summary
Engineering reference data for AD8418WBRZ-RL — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | AD8418WBRZ | AD8418BRZ | AD8418WBRMZ-RL | AD8418BRMZ-RL | INA240A1DR | INA240A2DR |
|---|---|---|---|---|---|---|---|
| Package | 8-SOIC | 8-SOIC | 8-SOIC | 8-MSOP | 8-MSOP | 8-SOIC | 8-SOIC |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Texas Instruments | Texas Instruments |
| Gain | 20 V/V | 20 V/V | 20 V/V | 20 V/V | 20 V/V | 20 V/V | 50 V/V |
| Common-Mode Input Range | -2V to +70V | -2V to +70V | -2V to +70V | -2V to +70V | -2V to +70V | -4V to +80V | -4V to +80V |
| Supply Voltage Range | 2.75V to 5.5V | 2.75V to 5.5V | 2.75V to 5.5V | 2.75V to 5.5V | 2.75V to 5.5V | 2.7V to 5.5V | 2.7V to 5.5V |
| Bandwidth | 250 kHz | 250 kHz | 250 kHz | 250 kHz | 250 kHz | 400 kHz | 400 kHz |
| Offset Voltage (max) | ±50 µV | ±50 µV | ±50 µV | ±50 µV | ±50 µV | ±25 µV | ±25 µV |
| Automotive Grade | Yes (AEC-Q100) | Yes (AEC-Q100) | No | Yes (AEC-Q100) | No | Yes (AEC-Q100) | Yes (AEC-Q100) |
Key Differentiators
- AEC-Q100 automotive qualification (vs AD8418BRZ)
- Wider common-mode range than INA240 (vs INA240A1DR)
- Lower offset voltage than INA240 (vs INA240A1DR)
Design Notes
Place the shunt resistor close to the AD8418WBRZ-RL inputs to minimize parasitic inductance and resistance. Use Kelvin connections to the shunt to avoid errors from trace resistance. Keep the input traces short and shielded if possible. Decouple the VS pin with a 0.1 µF ceramic capacitor placed as close as possible to the pin, and a 10 µF bulk capacitor nearby.
Ensure the common-mode voltage at the inputs stays within -2V to +70V. Exceeding this range can damage the device or cause inaccurate readings. Also, the reference pins (REF1 and REF2) should be connected to a low-impedance source, such as a voltage divider with a buffer, to avoid gain errors. Do not leave the reference pins floating.
The AD8418WBRZ-RL dissipates minimal power (typically less than 25 mW) due to its low supply current. However, in high-temperature environments, ensure the junction temperature stays below 150°C. The SOIC package has a thermal resistance of approximately 100°C/W, so for ambient temperatures above 125°C, consider derating or using a heatsink.
Compliance Information
AEC-Q100 qualified per Arrow listing. RoHS compliant per distributor data. Other compliance info not specified in provided data.
