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MD0101

Microchip

High-Voltage Protection T/R Switch

MD0101 High-Voltage Protection T/R Switch with Clamp Diodes Features • Up to ±100V Input Voltage Protection • Low On-Re...


Microchip

MD0101

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Description
MD0101 High-Voltage Protection T/R Switch with Clamp Diodes Features Up to ±100V Input Voltage Protection Low On-Resistance, 15Ω Typical Integrated Clamp Diodes Fast Switching Speed Four Electrically Isolated Channels No External Supplies Needed Applications Medical Ultrasound Imaging Non-Destructive Testing Applications Fast Resettable Fuses High-Side Switches Data Acquisition General Description The MD0101 is a four-channel high-voltage current-limiting protection device. It is designed to protect a low-noise receiver from high-voltage transmit pulses in ultrasound applications and is commonly referred to as a T/R (transmit-and-receive) switch. Each channel has three terminals: TX, RX, and RGND. The analog switch terminals are TX and RX. RX has integrated clamping diodes to RGND to protect the receiver against high voltages. The output voltages will be clamped by the anti-parallel diodes to RGND at about ±0.6V. The MD0101 can be considered as a normally closed switch with a typical switch resistance of 15Ω, allowing small signals to pass. Once the voltage drop across the switch exceeds a nominal value of ±1V, the device turns off. In the OFF state, the MD0101 can withstand up to ±100V across its terminals. A small amount of current (200 µA, typically) is allowed to flow through. The MD0101 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 for protec...




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