MD0105 4-Channel High-Voltage Protection T/R Switch Features General Description Up to 130V Input Voltage Protection The MD0105 is a high-voltage current-limiting protection device. It is designed to protect a low-noise Low On-Resistance 15 Typical receiver from high-voltage transmit pulses in Fast Switching Speed ultrasound applications. The MD0105 is commonly Four Electrically Isolated Channels referred to as a T/R (transmit-and-receive) switch. No External Supplies Needed The device can be considered as a normally closed switch with a typical switching resistance of 15 that Applications allows small signals to pass. Once the voltage drop across the two terminals exceeds a nominal value of Medical Ultrasound Imaging 2V, the device will turn off. In the OFF state, the NDT Applications MD0105 can withstand up to 130V across its Fast Resettable Fuses terminals. A small amount of current (typically 200 A) High-Side Switches is allowed to flow through. Data Acquisition The MD0105 is not limited to just ultrasound applications. It can also be used as resettable fuses to protect power lines, for output short-circuit protection and to protect data acquisition instruments. The MD0105 is available in an 18-lead 5 x 5 mm DFN package as a 4-channel device. Package Type 18-lead DFN (Top view) 18 NC NC 1 A1 17 B1 2 16 NC NC 3 A2 15 B2 4 14 NC NC 5 A3 13 B3 6 12 NC NC 7 A4 11 B4 8 10 NC NC 9 See Table 2-1 for pin information. Pads are at the bottom of device. 2018 Microchip Technology Inc. DS20005739A-page 1MD0105 Functional Block Diagram COM Switch Control A B DS20005739A-page 2 2018 Microchip Technology Inc.