SI8921BD-IS4-HXY

A high-precision isolated amplifier optimized for shunt resistor-based current sensing. Low offset and gain errors with their associated temperature drift maintain measurement accuracy across the full operating temperature range. Using silicon dioxide as the isolation barrier, it supports electrical isolation up to 5 kVRMS in compliance with UL 1577 certification. This technology separates the high- and low-voltage domains to protect low-voltage components from damage, while providing low emissions and high magnetic field immunity. High common-mode transient immunity ensures correct signal transmission across the isolation barrier, making it suitable for industrial motor control and drive applications requiring high-voltage, high-power switching. Internal input common-mode overvoltage and high-side supply loss detection features aid fault diagnosis and system safety. Available in an 8-pin SOW package, it operates across the extended industrial temperature range of -40°C to 125°C.

Applications

• Motor drive
• Power supply
• Industrial control

Key features

• Differential input voltage range: ±250 mV
• Fixed initial gain: 8.2 or 41
• Low input offset and temperature drift: ±1 mV (max) at 25°C, ±4 μV/°C (max)
• Low gain error and temperature drift: ±0.5% (max) at 25°C, ±50 ppm/°C (max)
• Low nonlinearity and temperature drift: 0.01% (typ) over rated range, ±1 ppm/°C (typ)
• High-side and low-side support for 3.3 V and 5 V supply voltages
• High common-mode transient immunity: ±150 kV/μs (typ)
• Wide operating temperature range: -40°C to 125°C
• Safety and regulatory certifications: 7070 VPK isolation voltage per DIN EN IEC 60747-17; UL 1577 certified, 5 kVRMS for 1 minute; TUV relevant certifications
• Service life greater than 40 years at rated operating voltage