company blog about Mingjiada Electronics Supply ADI AD8418BRMZ Bidirectional Zero-Drift Current Sense Amplifier

Mingjiada Electronics Supply ADI AD8418BRMZ Bidirectional Zero-Drift Current Sense Amplifier

Shenzhen Mingjiada Electronics Co., Ltd. – Long-term supplier of the [ADI] AD8418BRMZ bidirectional, zero-drift current sense amplifier. This device is capable of measuring bidirectional current across a shunt resistor and is suitable for a wide range of automotive and industrial applications, including motor control, battery management and solenoid valve control.

I. Product Description Details
The AD8418BRMZ is a high-voltage, high-resolution current sense amplifier (CSA) introduced by ADI. Housed in an MSOP-8 package, this chip features a bidirectional measurement capability and a zero-drift core, and is specifically designed for high-precision current sampling in automotive and industrial applications. The AD8418BRMZ utilises a zero-drift core, with a typical offset drift of 0.1 μV/°C across the entire operating temperature range and common-mode voltage range. Its wide common-mode input voltage range (-2 V to +70 V) makes it particularly suitable for harsh environments such as motor drives and BMS (Battery Management Systems).

II. Specifications (AD8418BRMZ)
Description: Bidirectional, zero-drift current sense amplifier
Amplifier Type: Current sense (1 channel)
Package: MSOP-8 / SOIC-8
Initial Gain: 20 V/V
Gain Error: ±0.15% (maximum, over full temperature range)
Supply Voltage Range: 2.7 V to 5.5 V
Supply Current: 2.6 mA (Max)
Input Offset Voltage: ±200 μV (Typ)
Full Temperature Range Offset Voltage: ±400 μV (Max)
Offset Voltage Temperature Drift: 0.1 μV/°C (Typ)
Common-Mode Input Voltage (Operating): -2 V to +70 V
Common-Mode Input Voltage (Rated): -4 V to +85 V
Common-Mode Rejection Ratio (CMRR): 86 dB (DC to 10 kHz)
-3 dB Bandwidth: 250 kHz
Slew Rate: 1 V/μs
Input Bias Current: 130 μA
Operating Temperature Range: -40°C to +125°C
Mounting Type: Surface Mount (SMD/SMT)

III. Key Features of the AD8418BRMZ
1. Zero-Drift Architecture
The AD8418BRMZ utilises self-stabilised zero or chopper-stabilised technology to reduce offset voltage drift to the 0.1 μV/°C level. This feature enables it to maintain extremely high current measurement accuracy even in automotive cold start (-40°C) or high-temperature engine bay (+125°C) environments, avoiding the cumulative SOC (State of Charge) error caused by temperature drift in traditional operational amplifiers.
2. High-Voltage Bidirectional Current Sensing
The AD8418BRMZ supports a wide common-mode input voltage range of -2 V to +70 V. This means it can be placed directly on the high-side or low-side for measurement, and can accurately distinguish between charging (forward) and discharging (reverse) currents. This is critical for charge/discharge management in electric vehicle BMS and for phase current reconstruction in motor drives.
3. Enhanced EMI/EMC Performance
The AD8418BRMZ integrates an EMI filter and employs a specialised input stage design, enabling it to maintain excellent common-mode rejection even in the presence of severe PWM switching noise (such as in motor inverter environments), ensuring the output signal remains undistorted by noise.

IV. Typical Applications of the AD8418BRMZ
High-side current sensing
Motor control
Solenoid valve control
Power management
Low-side current sensing
Diagnostic protection

V. Mingjiada Electronics Supply – AD8418BRMZ Current Sense Amplifier
Leveraging a global supply chain network covering over 2 million product models, Mingjiada Electronics provides customers with a one-stop supply service for the full range of ADI products and other electronic components. This covers electronic components for popular sectors such as 5G, new energy, the Internet of Things (IoT), the Internet of Vehicles (IoV) and AI, and we can assist in sourcing niche, hard-to-find and industrial-grade components.

To enquire about the latest quotations, stock availability or sample procurement for the AD8418BRMZ, please visit the Mingjiada Electronics website or contact our Shenzhen sales team for real-time information.
Company URL: https://www.integrated-ic.com/