The T591B157M004ATE045 is a high-performance SMD (Surface Mount Device) Tantalum Capacitor made using Polymer technology, 4VDC, 150uF capacitance, 1380 parts per million (ppm) of specific capacitance tolerance, ESR (Equivalent Series Resistance) of 45mOhms, and an operating temperature range of -40°C to +105°C. It is manufactured by Kemet, and is certified to AEC-Q200 standards, making it suitable for use in automotive and industrial applications. It is rated to have a maximum voltage of 4.5V and a ripple current of 23mA, making it ideal for use in high-performance applications such as power electronics.