Supertex inc. MD0101 High Voltage Protection T/R Switch with Clamp Diodes Features General Description The Supertex MD0101 is a four channel, high voltage, current limiting Up to 100V input voltage protection protection device. It is designed to protect a low noise receiver from the Low on resistance - 15 typical high voltage transmit pulses in ultrasound applications and is commonly Integrated clamp diodes referred to as a T/R (transmit and receive) switch. Each channel has Fast switching speed three terminals Tx, Rx, and R . The analog switch terminals are GND Four electrically isolated channels Tx and Rx. Rx has integrated clamping diodes to R to protect the GND No external supplies needed receiver against high voltages. Voltages greater than 0.6V will start forward biasing the clamp diodes to R . GND Applications The MD0101 can be considered as a normally closed switch with a Medical ultrasound imaging typical switch resistance of 15, allowing small signals to pass. Once NDT applications 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 Fast resettable fuses up to 100V across its terminals. A small amount of current, 200A, is High side switches allowed to flow through. Data acquisition 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 Piezo Transmitter Transducers -90V Logic TX Control and Signal Processing RX TX MD0101 RX High Voltage RGND Switches Receiver T/R Switch Doc. DSFP-MD0101 Supertex inc. C070213 www.supertex.comMD0101 Pin Configuration Ordering Information Part Number Package Packing 18 NC NC 1 MD0101K6-G 18-Lead DFN (5x5) 490/Tray Rx1 2 17 Tx1 MD0101K6-G M932 18-Lead DFN (5x5) 2500/Reel 16 RGND1 NC 3 -G denotes a lead (Pb)-free / RoHS compliant package 4 15 Rx2 Tx2 14 RGND2 NC 5 13 Rx3 Tx3 6 ESD Sensitive Device RGND3 7 12 NC 1 Absolute Maximum Ratings 11 Rx4 Tx4 8 9 10 RGND4 NC Parameter Value V - V , Differential voltage drop 0 to 110V TX RX 18-Lead DFN Maximum junction temperature +125C (top view) (Pad is at bottom of device) Storage temperature range -65C to 150C 2 Power dissipation, 18-Lead DFN 1.6W Product Marking 1. Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these conditions is not L = Lot Number MD0101 implied. Continuous operation of the device at the absolute rating level YY = Last Digit of Year Sealed LLLLLL may affect device reliability. All voltages are referenced to device ground. WW = Code for Week Sealed YYWW A = Assembler ID 2. Mounted on FR4 board, 25mm x 25mm x 1.57mm AAACCC C = Country of Origin = Green Packaging Typical Thermal Resistance 18-Lead DFN Package Package may or may not include the following marks: Si or ja O 18-Lead DFN 30 C/W Electrical Characteristics (T = 25C, unless otherwise specified) a Sym Parameter Min Typ Max Units Conditions V Max. differential input voltage from TX to RX 100 - - V I = 500A TX-RX TX-RX R Switch ON resistance from TX to RX - 15 - I = 5.0mA SW TX-RX V V trip point to turn off - 1.0 2.0 V --- TRIP TX - RX V Switch turn off voltage - 2.0 - V I = 1.0mA OFF TX-RX I Switch off current - 200 300 A V = 100V A-B(OFF) TX-RX I Peak switching current - 60 - mA --- PEAK T Turn off time - - 20 ns --- OFF T Turn on time - - 20 ns --- ON C Switch ON capacitance from TX to RX - 15 - pF SW = ON TX(ON) C Switch OFF capacitance from TX to RX - 9.0 - pF V = 25V TX(OFF) TX-RX BW Small signal bandwidth - 100 - MHz R = 50 LOAD T Operating junction temperature -40 - +125 C --- J I = 200mA, RGND = 0V, RX V Diode forward voltage drop - 1.6 - V RX TX = Open C RX capacitance to RGND - 20 - pF RGND = 0V, TX = Open D Doc. DSFP-MD0101 Supertex inc. C070213 2 www.supertex.com