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QB210T Datasheet Preview

QB210T Datasheet

Normally-closed Switch

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QB210T
INC. QBAR® NORMALLY-CLOSED SWITCH
DESCRIPTION
QBAR® ICs provide a 3-terminal semiconductor
switch that functions as:
• a solid-state normally-closed switch
• a non-inverting digital transistor
• a solid-state replacement for a normally-closed,
non-isolating relay.
QBAR® ICs do not require a separate power
supply lead. This makes possible:
• simplified control wiring
• replacement of normally-closed D.C. relays
with highly reliable solid-state devices
• improved fail-safe performance in the event
of lost control power, severed or shorted
control wires.
21
3
4
3 AMPERES
20 VOLTS
TO-220 package
PIN
1 INPUT
2 GND
3 OUTPUT
4 GND
QBAR SWITCH SYMBOL
OUTPUT
INPUT
GND
FUNCTIONAL SCHEMATIC
OUTPUT
INPUT
(CMOS
or TTL)
FUNCTION TABLE
INPUT
HI
LO
OPEN
SWITCH STATE
(OUTPUT-TO-GND)
OFF
ON
ON
TYPICAL APPLICATIONS
ALARM SWITCH
+20V
+5V
REGULATOR
Warning
indicator,
cooling fan,
brake
actuator
LOGIC
Status
Normally
HI
www.DataSheet4U.com
A QBAR switch activates an alarm over a
large range of system failure conditions:
• system failure indicated by a LO on the
status output
• status conductor cut
• status conductor shorted to ground
• loss of +5V supply
Any of these conditions will cause the QBAR
switch to turn ON and power the alarm.
PROTECTION OF FRAGILE OR
TRIGGER DEVICES
+12V
+5V
REGULATOR
Status
Inputs,
normally
high
to other
logic
Status
Normally
HI
I
A QBAR switch protects the load from being
driven by false signals when all status indi-
cators are not OK. Damage to fragile loads
such as laser diodes, or erroneous firing of
detonators can be avoided with a QBAR
switch. It shunts drive current I around the
load when any Status Gate input goes LO,
when +5V power is lost, or when the conduc-
tor from the Status Gate output to the QBAR
switch input is cut or shorted to ground.
POWER SUPPLY
EFFICIENCY BOOST
DC
Power
Supply
(up to 20V)
+
Cout
Vout
Bleeder
Resistor
Logic
Increase your power supply
efficiency by using a QBAR
switch to lower the parasitic
current drain through the
bleeder resistor during nor-
mal supply operation.




BitParts

QB210T Datasheet Preview

QB210T Datasheet

Normally-closed Switch

No Preview Available !

QB210T
ABSOLUTE MAXIMUM RATINGS
Voltage, output to ground . . . . . . . . . . . . . . . . . . . . . 24 V
Voltage, input to ground . . . . . . . . . . . . . . . . . . . . . . ±6 V
Operating Temperature Range, T case . . . . 0°C to 70°C
Storage Temperature Range . . . . . . . . . -55°C to 150°C
Output current, continuous . . . . . . . . . . . . . . . . . . . . . 3A
(OK to exceed +6V if Input Current is limited to 2mA)
ELECTRICAL SPECIFICATIONS (Over full operating temperature range, unless noted)
PARAMETER
OFF Characteristics
Output Breakdown Voltage
Output OFF Current
Input HIGH Logic Threshold
Input HIGH Input Current
CONDITIONS
V input 2.4 V
I output 750 µA
V input 2.4 V
V output = 20 V
V input = 2.4 V
MIN TYP MAX
20
+300
+750
1.7 2.4
0 +60
ON Characteristics
Output ON Voltage
Input LOW Logic Threshold
Input LOW Input Current
Input Logic Threshold
Hysteresis
SWITCHING Characteristics
Turn-on Time, Turn-off Time
V input 0.8 V
I output = 1.80 A
-6 V V input 0.8 V
V in0 = 0.8 V
V in1 = 2.4 V
Vcc = 12 V
I out = 50 mA
1.3 1.8
0.8 1.4
-20 +20
0.1
25
UNITS
V
µA
V
µA
V
V
µA
V
µs
Notes:
1. When not connected, the Input Terminal floats LOW,
putting the QBAR® switch in the ON state.
Nevertheless, for minimum noise susceptibility,
inputs should be connected to valid logic levels.
2. QBAR switches are protected by U.S. Patent # 5,134,323
and foreign patents.
Available Options:
Package Max Current
Suffix Order No.
SOT-23 . . . . 175mA . . . . . . . . . M3 . . . . . QB104M3
TO-92 . . . . . 175mA . . . . . . . . . Z . . . . . . . . . QB104Z
TO-220 . . . . 3A . . . . . . . . . . . . T . . . . . . . . . QB210T
Contact BitParts, Inc. for other package options.
www.DataSheet4U.com
INC.
BitParts, Inc.
56 Union Avenue, PO Box 617, Sudbury MA 01776
Tel: (978) 443-5720 Fax: (978) 443-5744
bitparts@bitpartsinc.com
www.bitpartsinc.com
BITPARTS, INC. reserves the right to make changes without further notice to these components to improve
reliability, function or design. BITPARTS, INC. assumes no liability arising from the use of these
components. The products of BITPARTS, INC. are not intended for use in life support appliances,devices,
or systems. Use of a BITPARTS, INC. product in such applications without the written consent of the
President of BITPARTS, INC. is prohibited.
QBAR is a registered trademark of BitParts, Inc.
© Copyright 1999 BitParts, Inc. All rights reserved.
Ref: QB210T—2/99
Printed in Canada


Part Number QB210T
Description Normally-closed Switch
Maker BitParts
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QB210T Datasheet PDF






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