AD8412AWBRZ - 1.8MHz High BW Current Sense Amp | Analog Devices
MPN: AD8412AWBRZ β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $2.85 | $2.85 |
| 10 | $2.56 | $25.60 |
| 100 | $2.28 | $228.00 |
| 500 | $2.05 | $1,025.00 |
| 1,000 | $1.85 | $1,850.00 |
Drop-in alternatives for AD8412AWBRZ β same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
AD8412A
β Drop-Inπ Reference alternative (not in catalog)
INA240A1DR
β Drop-Inπ Reference alternative (not in catalog)
INA240A2DR
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INA240A3DR
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AD8412AWBRZ Maximum Ratings & Electrical Characteristics
| Input Voltage Range | -2 V to 50 V |
| Bandwidth | 1.8 MHz |
| Gain | 10 V/V |
| Supply Voltage Range | 2.9 V to 5.5 V |
| Offset Voltage | 200 Β΅V (typical) |
| Gain Error | 0.15% (typical) |
| Quiescent Current | 2.2 mA (typical) |
| Shutdown Current | 1 Β΅A (typical) |
| Operating Temperature Range | -40Β°C to +125Β°C |
| Package | SOIC-8 |
| Mounting Type | Surface Mount |
| Number of Channels | 1 |
| Output Type | Single-Ended |
| RoHS Status | Compliant |
| MSL Level | 1 |
AD8412AWBRZ Pin Configuration
| Pin 1 | IN+ β Positive sense input |
| Pin 2 | IN- β Negative sense input |
| Pin 3 | GND β Ground |
| Pin 4 | OUT β Amplifier output |
| Pin 5 | REF β Reference voltage input |
| Pin 6 | NC β No connect |
| Pin 7 | SHDN β Shutdown (active low) |
| Pin 8 | VS β Positive supply |
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
AD8412AWBRZ is suitable for 6 applications: High-Side Current Sensing in DC-DC Converters, Motor Control in Automotive Systems, Battery Management in Electric Vehicles, Industrial Process Control, Power Supply Monitoring, Telecommunications Equipment.
High-Side Current Sensing in DC-DC Converters
The AD8412AWBRZ is ideal for high-side current sensing in 48V/12V DC-DC converters. Its wide input range of -2V to 50V and 1.8MHz bandwidth allow accurate measurement of fast switching currents. The fixed gain of 10V/V simplifies scaling, and the low offset voltage ensures precision. Place the sense resistor between the supply and the load, and connect the amplifier inputs across it. The output can be fed to an ADC or comparator for monitoring and control. The high bandwidth ensures minimal delay in feedback loops, improving transient response.
Recommended
Motor Control in Automotive Systems
In automotive motor control, the AD8412AWBRZ provides accurate current feedback for closed-loop control. Its wide common-mode range handles the high-side voltage of the motor supply, and the 1.8MHz bandwidth captures fast current changes. The extended temperature range of -40Β°C to +125Β°C ensures reliability in harsh environments. The low offset voltage minimizes error in torque estimation. Connect the sense resistor in series with the motor winding and use the amplifier output for PWM control or fault detection. The shutdown feature reduces power consumption when the motor is idle.
Recommended
Battery Management in Electric Vehicles
The AD8412AWBRZ is used in battery management systems (BMS) to monitor charge and discharge currents. Its wide input range accommodates the battery voltage variations, and the high bandwidth allows accurate measurement of transient currents during regenerative braking. The low quiescent current of 2.2mA is beneficial for battery-powered systems. The fixed gain simplifies calibration, and the shutdown mode helps conserve energy. Place the sense resistor in the battery pack's main current path and connect the amplifier to the BMS microcontroller. The output can be used for state-of-charge estimation and overcurrent protection.
Recommended
Industrial Process Control
In industrial process control, the AD8412AWBRZ monitors current in actuators, heaters, and motors. Its wide input range and high bandwidth ensure accurate measurement in noisy environments. The DigiTrim architecture provides stable performance over temperature, reducing calibration requirements. The SOIC-8 package is easy to integrate into existing PCB designs. Use the amplifier to sense current in a 4-20mA loop or a motor drive. The output can be interfaced with a PLC or ADC for monitoring and control. The device's robustness makes it suitable for factory automation.
Recommended
Power Supply Monitoring
The AD8412AWBRZ is used in power supply monitoring to measure output current and detect overloads. Its wide input range allows sensing on the high side of the supply, and the high bandwidth ensures fast response to load changes. The low offset voltage improves accuracy in low-current measurements. The shutdown feature can be used to disable the amplifier during standby. Connect the sense resistor in series with the load and use the amplifier output for overcurrent protection or telemetry. The device's small footprint is ideal for space-constrained power modules.
Recommended
Telecommunications Equipment
In telecommunications, the AD8412AWBRZ monitors current in -48V power distribution systems. Its input range of -2V to 50V covers the negative rail, and the high bandwidth allows accurate measurement of transient currents. The low offset voltage ensures precise power monitoring. The device operates from a 3.3V or 5V supply, which is common in telecom equipment. Use the amplifier to sense current in a -48V feed and provide feedback to a power management controller. The SOIC-8 package is suitable for high-density boards.
Recommended
Recommended Products Summary
Engineering reference data for AD8412AWBRZ β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | AD8412ABRMZ | INA240A1DR | INA240A2DR |
|---|---|---|---|---|
| Package | SOIC-8 | MSOP-8 | SOIC-8 | SOIC-8 |
| Brand | Analog Devices | Analog Devices | Texas Instruments | Texas Instruments |
| Input Voltage Range | -2V to 50V | -2V to 50V | -4V to 80V | -4V to 80V |
| Bandwidth | 1.8MHz | 1.8MHz | 400kHz | 400kHz |
| Gain | 10V/V | 10V/V | 20V/V | 20V/V |
| Supply Voltage Range | 2.9V to 5.5V | 2.9V to 5.5V | 2.7V to 5.5V | 2.7V to 5.5V |
| Offset Voltage | 200Β΅V | 200Β΅V | 25Β΅V | 25Β΅V |
| Quiescent Current | 2.2mA | 2.2mA | 2.4mA | 2.4mA |
Key Differentiators
- Higher bandwidth than INA240 (vs INA240A1DR)
- Wider input voltage range than INA240 (vs INA240A1DR)
- Lower quiescent current than INA240 (vs INA240A1DR)
Design Notes
Use Kelvin connections to the sense resistor to minimize parasitic resistance and ensure accurate current sensing. Place the sense resistor close to the amplifier inputs and route the traces as a differential pair. Keep the input traces short and shielded to reduce noise pickup.
Bypass the VS pin with a 0.1Β΅F ceramic capacitor placed as close as possible to the pin. For noisy environments, add a 10Β΅F electrolytic capacitor in parallel. Ensure the supply voltage is within the 2.9V to 5.5V range to avoid damage.
Do not exceed the input voltage range of -2V to 50V, as this can damage the amplifier. The shutdown pin (SHDN) is active low; leave it unconnected or tie to VS for normal operation. Avoid floating the REF pin; connect it to GND or a reference voltage as needed.
Compliance Information
RoHS compliant per Analog Devices product page. AEC-Q100 qualification not specified for this part.
