SI8931D-IS4R IC-8931 ISOLATİON IC AUTOMOTİVE, INVERTERS,UPS 8 The SI8931D-IS4R is a high-quality product offering IC-8931 ISOLATİON IC AUTOMOTİVE, INVERTERS,UPS 8. With a shrink ratio of N/A and nan operating temperature, it provides reliability in various applications.