AD8412AWBRZ - 1.8MHz High BW Current Sense Amp | Analog Devices
MPN: AD8412AWBRZ ✓ 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 | $1.82 | $1,820.00 |
AD8412AWBRZ Overview
A current sense amplifier is a specialized operational amplifier configured to amplify the small differential voltage across a sense resistor while rejecting common-mode voltages. It is a critical building block in power management systems, motor control, and battery monitoring, where precise current sensing is essential for efficiency and safety. The AD8412A belongs to the family of current sense amplifiers, which are a subset of instrumentation amplifiers and are widely used in closed-loop control systems.
Key features of the AD8412AWBRZ include its wide common-mode input range, which allows it to sense current on both high-side and low-side configurations, and its high bandwidth, which enables accurate measurement of fast transients. The DigiTrim architecture provides precision offset and gain specifications without the need for chopping or autozeroing, avoiding intermodulation distortion. The device also offers a shutdown feature for power saving and is specified over the extended industrial temperature range of -40°C to +125°C.
Technically, the AD8412A uses a proprietary DigiTrim calibration technique that trims offset and gain at the wafer level, achieving typical offset voltage of 200µV and gain error of 0.15%. The high bandwidth of 1.8MHz ensures that the amplifier can track current waveforms in switching power supplies and motor drives without significant delay. The device is designed to operate with a single supply, simplifying power supply design.
Typical applications include high-side current sensing in 48V/12V DC-DC converters, motor control in automotive and industrial systems, and battery management in electric vehicles. The wide input range and high bandwidth make it suitable for both low-side and high-side sensing in harsh environments.
When designing with the AD8412AWBRZ, ensure that the shunt resistor is placed appropriately and that the input pins are protected against overvoltage. The gain is fixed at 10V/V, so the output voltage is directly proportional to the sensed current. Proper PCB layout with Kelvin connections to the shunt is recommended to minimize parasitic resistance and maintain accuracy.
Drop-in alternatives for AD8412AWBRZ — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
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AD8412AWBRZ Maximum Ratings & Electrical Characteristics
| Input Voltage Range | -2V to 50V |
| Bandwidth | 1.8MHz |
| Gain | 10V/V |
| Supply Voltage Range | 2.9V to 5.5V |
| Offset Voltage (Typ) | 200µV |
| Gain Error (Typ) | 0.15% |
| Operating Temperature Range | -40°C to +125°C |
| Package | SOIC-8 |
| Mounting Type | Surface Mount |
| Number of Circuits | 1 |
| Output Type | Single-Ended |
| Shutdown Feature | Yes |
| Architecture | DigiTrim |
| RoHS Status | Compliant |
AD8412AWBRZ Pin Configuration
| Pin 1 | VCC — Power supply input (2.9V to 5.5V) |
| Pin 2 | GND — Ground |
| Pin 3 | IN+ — Positive sense input |
| Pin 4 | IN- — Negative sense input |
| Pin 5 | OUT — Amplified output voltage |
| Pin 6 | REF — Reference voltage for output offset |
| Pin 7 | SHDN — Shutdown control (active low) |
| Pin 8 | NC — No connect |
Typical Applications
AD8412AWBRZ is suitable for 6 applications: High-Side Current Sensing in DC-DC Converters, Motor Control in Automotive and Industrial Systems, Battery Management in Electric Vehicles, 48V/12V DC-DC Systems, Industrial Automation and Robotics, Power Supply Monitoring.
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 voltage range of -2V to 50V allows it to directly sense the current on the high side without level shifting. The 1.8MHz bandwidth ensures accurate measurement of fast switching transients, while the fixed gain of 10V/V simplifies the interface to the ADC. The low offset voltage of 200µV and gain error of 0.15% provide high accuracy, essential for efficient power management. The device operates from a single 2.9V to 5.5V supply, making it easy to integrate with the converter's control circuitry. Its SOIC-8 package is compact and suitable for space-constrained designs.
Recommended
Motor Control in Automotive and Industrial Systems
In motor control applications, the AD8412AWBRZ provides precise current feedback for closed-loop control. Its wide common-mode input range allows sensing on either the high or low side of the motor drive, and the 1.8MHz bandwidth captures fast current changes during PWM switching. The DigiTrim architecture ensures low offset and gain error, improving torque and speed accuracy. The device's extended temperature range of -40°C to +125°C makes it suitable for under-hood automotive and industrial environments. The shutdown feature helps reduce power consumption when the motor is idle. The SOIC-8 package is robust and easy to mount on the control board.
Recommended
Battery Management in Electric Vehicles
The AD8412AWBRZ is well-suited for battery management systems (BMS) in electric vehicles, where accurate current measurement is critical for state-of-charge estimation and protection. Its wide input voltage range of -2V to 50V accommodates the varying battery stack voltages, and the high bandwidth allows monitoring of rapid charge/discharge pulses. The low offset voltage of 200µV and gain error of 0.15% ensure precise current integration over time. The device operates from a low supply voltage, compatible with the BMS microcontroller. Its automotive-grade temperature range and SOIC-8 package make it a reliable choice for harsh environments.
Recommended
48V/12V DC-DC Systems
The AD8412AWBRZ is specifically designed for 48V/12V DC-DC systems, as highlighted in the Mouser product description. Its wide input voltage range of -2V to 50V covers both 48V and 12V rails, and the 1.8MHz bandwidth enables accurate current sensing in high-frequency switching converters. The fixed gain of 10V/V simplifies scaling, and the low offset and gain error improve efficiency monitoring. The device's single-supply operation from 2.9V to 5.5V is compatible with typical control ICs. The SOIC-8 package is ideal for compact power modules.
Recommended
Industrial Automation and Robotics
In industrial automation, the AD8412AWBRZ provides accurate current sensing for motor drives, solenoids, and actuators. Its wide input voltage range and high bandwidth allow it to handle the dynamic currents in robotic arms and conveyor systems. The DigiTrim architecture ensures stable performance over temperature, reducing calibration requirements. The device's shutdown feature helps save power in standby modes. The SOIC-8 package is suitable for PCB assembly in control cabinets. The extended temperature range of -40°C to +125°C ensures reliable operation in factory environments.
Recommended
Power Supply Monitoring
The AD8412AWBRZ is used in power supply monitoring to measure output current and detect overloads. Its wide input voltage range allows it to sense current on the output rail, and the 1.8MHz bandwidth captures transient events. The low offset voltage of 200µV enables accurate measurement at low currents, while the gain error of 0.15% ensures consistent readings. The device operates from a single supply, simplifying integration with monitoring circuits. The SOIC-8 package is compact and suitable for power supply modules. The shutdown feature can be used to disable sensing during standby.
Recommended
Recommended Products Summary
Engineering reference data for AD8412AWBRZ — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | AD8412ABRMZ | AD8412ABRMZ-RL | AD8412A | INA240A1 |
|---|---|---|---|---|---|
| Package | SOIC-8 | MSOP-8 | MSOP-8 | SOIC-8 | SOIC-8 |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Texas Instruments |
| Input Voltage Range | -2V to 50V | -2V to 50V | -2V to 50V | -2V to 50V | -4V to 80V |
| Bandwidth | 1.8MHz | 1.8MHz | 1.8MHz | 1.8MHz | 400kHz |
| Gain | 10V/V | 10V/V | 10V/V | 10V/V | 20V/V |
| Supply Voltage Range | 2.9V to 5.5V | 2.9V to 5.5V | 2.9V to 5.5V | 2.9V to 5.5V | 2.7V to 5.5V |
| Offset Voltage (Typ) | 200µV | 200µV | 200µV | 200µV | 25µV |
| Gain Error (Typ) | 0.15% | 0.15% | 0.15% | 0.15% | 0.05% |
Key Differentiators
- High bandwidth of 1.8MHz (vs INA240A1)
- Wide input voltage range of -2V to 50V (vs INA240A1)
- DigiTrim architecture (vs INA240A1)
Design Notes
For accurate current sensing, use Kelvin connections to the shunt resistor to minimize parasitic resistance. Place the sense resistor close to the amplifier inputs and keep the traces short and wide. This reduces voltage drop errors and improves measurement accuracy.
The AD8412AWBRZ operates from a single 2.9V to 5.5V supply. Ensure the supply is well-decoupled with a 0.1µF ceramic capacitor placed close to the VCC pin. This prevents noise from affecting the amplifier's performance.
Do not exceed the input voltage range of -2V to 50V, as this can damage the device. Use external protection diodes if overvoltage transients are expected. Also, ensure the shutdown pin is properly driven to avoid unintended shutdown.
Compliance Information
RoHS compliance is indicated in the product description. Other compliance details are not specified in the provided data.
