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MD0101K6-G

High Voltage Protection T/R Switch with Clamp Diodes

Supertex Inc 

Supertex inc.

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

►► NDT applications

►► Fast resettable fuses

►► High side switches

►► Data acquisition

General Description

The Supertex MD0101 is a four channel, high voltage, current limiting

protection device. It is designed to protect a low noise receiver from the

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. Voltages greater than ±0.6V will start

forward biasing the clamp diodes to RGND.

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 ±1.0V,

the device will start to turn off. In the off state, the MD0101 can withstand

up to ±100V across its terminals. A small amount of current, 200µA, is

allowed to flow through.

The MD0101 is not limited to just ultrasound applications. It can also

be used for resettable fuses to protect power lines, output short circuit

protection, and data acquisition. The MD0101 is available in an 18-

Lead, 5x5mm DFN package as a four channel device for high density

requirements.

Typical Application Circuit

One of 128 Channels

+90V

Logic

Control

and

Signal

Processing

Transmitter

TX

-90V

RX

Receiver

RX MD0101 TX

RGND

T/R Switch

Piezo

Transducers

High Voltage

Switches

Supertex inc. ● 1235 Bordeaux Drive, Sunnyvale, CA 94089 ● Tel: 408-222-8888 ● www.supertex.com

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