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Supertex |
Supertex inc.
Four-Channel
High Voltage Protection T/R Switch
MD0105
Features
►► Up to ±130V input voltage protection
►► Low on resistance - 15Ω typical
►► 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 MD0105 is a 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.
The MD0105 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 two terminals exceeds a nominal
value of ±2.0V, the device will start to turn off. In the off state, the
MD0105 can withstand up to ±130V across its terminals. A small
amount of current, typically 200µA, is allowed to flow through.
The MD0105 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 MD0105 is
available in an 18-Lead 5x5mm DFN package as a four-channel
device.
Typical Application Circuit
+130V
Logic
Control
and
Signal
Processing
Transmitter
TX
-130V
RX
Receiver
B MD0105 A
T/R Switch
Piezo
Transducers
High Voltage
Switches
Doc.# DSFP-MD0105
C070213
Supertex inc.
www.supertex.com
MD0105
Ordering Information
Pin Configurations
Part Number
Package
Packing
MD0105K6-G
MD0105K6-G M932
18-Lead DFN (5x5)
18-Lead DFN (5x5)
490/Tray
2500/Reel
NC 1
A1 2
NC 3
18 NC
17 B1
16 NC
A2 4
15 B2
NC 5
14 NC
ESD Sensitive Device
A3 6
13 B3
Absolute Maximum Ratings
Parameter
Value
NC 7
A4 8
NC 9
12 NC
11 B4
10 NC
VA - VB, Differential voltage drop
0 to ±140V
Maximum junction temperature
Storage temperature range
+125°C
-65°C to 150°C
18-Lead DFN
(top view)
(Pads are at bottom of device)
Power dissipation, 18-Lead DFN2
1.6W
Notes:
Product Marking
1. Absolute Maximum Ratings are those values beyond which damage to
the device may occur. Functional operation under these conditions is not
implied. Continuous operation of the device at the absolute rating level may
affect device reliability. All voltages are referenced to device ground.
2. Mounted on FR4 board, 25mm x 25mm x 1.57mm
MD0105
LLLLLL
YYWW
AAACCC
L = Lot Number
YY = Last Digit of Year Sealed
WW = Code for Week Sealed
A = Assembler ID
C = Country of Origin
= “Green” Packaging
Typical Thermal Resistance
Package
θja
18-Lead DFN
Package may or may not include the following marks: Si or
18-Lead DFN
30OC/W
Electrical Characteristics
(TJ = 25ºC, unless otherwise specified)
Sym Parameter
VA-B
RSW
VTRIP
VOFF
IA-B(OFF)
IPEAK
TOFF
TON
CSW(ON)
CSW(OFF)
BW
Max. differential input voltage from A to B
Switch ON resistance from A to B
VA-B trip point to turn off
Switch turn off voltage
Switch off current
Peak switching current
Turn off time
Turn on time
Switch ON capacitance from A to B
Switch OFF capacitance from A to B
Small signal bandwidth
TJ Operating junction temperature
Min
±130
-
-
-
-
-
-
-
-
-
-
-40
Typ
-
15
±1.0
±2.0
±200
±60
-
-
21
15
100
-
Max
-
-
±2.0
-
±300
-
20
20
-
-
-
+125
Units Conditions
V IA-B = ±1.0mA
Ω IA-B = ±5.0mA
V ---
V IA-B = ±1.0mA
µA VA-B = ±130V
mA ---
ns ---
ns ---
pF SW = ON
pF
MHz
°C
VSW = 25V
RLOAD = 50Ω
---
Doc.# DSFP-MD0105
C070213
Supertex inc.
2 www.supertex.com
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