OPTEK Technology Inc. — 1645 Wallace Drive, Carrollton, Texas 75006
Phone: (972) 323-2200 or (800) 341-4747 FAX: (972) 323-2396 sensors@optekinc.com www.optekinc.com
Issue A.1 11/08
Page 1 of 6
OPTEK reserves the right to make changes at any time in order to improve design and to supply the best product possible.
Slotted Optical Switch
OPB420AZ & OPB420BZ
Features:
• Non-contact switching
• Right Angle Sensor: LED in tower, photosensor in base
• Choice of output configuration
• Optical line can be broken in three axis
• 24” minimum, 26 AWG UL approved wire leads
Description:
The OPB420 series optical switch consists of an infrared emitting diode (LED) and a phototransistor. The LED is
mounted on the tower with the phototransistor mounted on the base of a right angle shape package. The L-Shape
or right angle package configuration allows for an opaque object to block the light beam from a multitude of
directions including the X-axis Y-axis and Z-axis. The optical center line between the emitter and photosensor is
at 45° from the mounting base of the device. The OPB420AZ utilizes a phototransistor with a current output
proportional to the input drive current of the LED. The OPB420BZ utilizes a phototransistor with a base-emitter
resistance (RBE) which provides protection from low level light conditions. The OPB420BZ is ideal for applications
that require an enhanced contrast ratio and immunity to background irradiance, such as detection of semi-
transparent media.
Custom electrical, wire and cabling and connectors are available. Contact your local representative or OPTEK for
more information.
Product Photo Here
Applications:
• Non-contact interruptive object
sensing
• Tray-out sensor
• Low paper tray sensor
• Corner sensor
• Printers
• Copying machines
• Paper sorting equipment
• Amusement gaming equipment
• Door sensor
• Optical Switch
RoHS
Part # LED
Wavelength PhotoSensor
OPB420AZ 880 nm Phototransistor
OPB420BZ RBE Phototransistor
OPB420AZ OPB420BZ
OPTEK Technology Inc. — 1645 Wallace Drive, Carrollton, Texas 75006
Phone: (972) 323-2200 or (800) 341-4747 FAX: (972) 323-2396 sensors@optekinc.com www.optekinc.com
Issue A.1 11/08
Page 2 of 6
OPTEK reserves the right to make changes at any time in order to improve design and to supply the best product possible.
Slotted Optical Switch
OPB420AZ & OPB42BZ
Mechanical Package Information
Description Wire Color
Anode Red
Cathode Black
Collector White
Emitter Green
Dimensions are in Inches [Millimeters]
Tolerances ±0.010” [0.25mm]
OPTEK Technology Inc. — 1645 Wallace Drive, Carrollton, Texas 75006
Phone: (972) 323-2200 or (800) 341-4747 FAX: (972) 323-2396 sensors@optekinc.com www.optekinc.com
Issue A.1 11/08
Page 3 of 6
OPTEK reserves the right to make changes at any time in order to improve design and to supply the best product possible.
Slotted Optical Switch
OPB420AZ & OPB420BZ
Notes:
(1) RMA flux is recommended. Duration can be extended to 10 seconds maximum when flow soldering.
(2) Derate linearly 1.67 mW/°C above 25 ° C..
(3) Methanol or isopropanol are recommended as cleaning agents. Plastic housing is soluble in chlorinated hydrocarbons and ketones.
(4) All parameters were tested using pulse technique.
(5) Simulated optical path blocked with infrared semi-transparent object
Electrical Characteristics (TA = 25°C unless otherwise noted)
SYMBOL PARAMETER MIN TYP MAX UNITS TEST CONDITIONS
Input Diode (See OP240 or OP265 for additional information)
VF Forward Voltage 1.2 - 1.7 V IF = 20 mA
IR Reverse Current - - 100 µA VR = 2 V
Output Phototransistor (See OP505 or OP705 for additional information)
V(BR)CEO
Collector-Emitter Breakdown Voltage
OPB420AZ
OPB420BZ
30
24
-
-
-
-
V
IC = 1 mA
IC = 100 µA
V(BR)ECO
Emitter-Collector Breakdown Voltage
OPB420AZ
OPB420BZ
5.0
0.4
-
-
-
-
V
IE = 100 µA
ICEO Collector-Emitter Dark Current - - 100 nA VCE = 10 V, IF = 0, EE = 0
Combined
VCE(SAT) Collector-Emitter Saturation Voltage - - 0.4 V IC = 250 µA, IF = 20 mA
IC(ON) On-State Collector Current 1.0 - 10.0 mA VCE = 5.0 V, IF = 20 mA
IC(Off) Off-State Collector Current—
OPB420BZ - - 450 µA
VCE = 5 V, IF = 1 mA (5)
Phototransistor Version
Absolute Maximum Ratings (TA=25°C unless otherwise noted)
Storage & Operating Temperature Range -40° C to +85° C
Lead Soldering Temperature [1/16 inch (1.6mm) from the case for 5 sec. with soldering iron] (1) 260° C
Input Diode
Continuous Forward Current 50 mA
Peak Forward Current (1 μs pulse width, 300 pps) 1 A
Reverse Voltage 2 V
Power Dissipation (2) 100 mW
Output Phototransistor
Power Dissipation (2) 100 mW
Collector-Emitter Breakdown Voltage
OPB420AZ
OPB420BZ
30 V
24 V
OPTEK Technology Inc. — 1645 Wallace Drive, Carrollton, Texas 75006
Phone: (972) 323-2200 or (800) 341-4747 FAX: (972) 323-2396 sensors@optekinc.com www.optekinc.com
Issue A.1 11/08
Page 4 of 6
OPTEK reserves the right to make changes at any time in order to improve design and to supply the best product possible.
Slotted Optical Switch
OPB420AZ & OPB42BZ
Typical Output Current Vs Forward Current
0%
25%
50%
75%
100%
125%
150%
175%
200%
225%
250%
0 5 10 15 20 25 30 35 40 45 50
I
F
- Forward Current -mA
Normalized Output Current - %
V
CE
= 5 V
DC
, TA = 25°C
Normalized to I
F
= 20 mA
R
BE
Phototransistor
Phototransistor
Typical Output Current Vs Distance
(Z Axis Blocked)
0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
0 0.02 0.04 0.06 0.08 0.1 0.12 0.14 0.16 0.18 0.2 0.22 0.24 0.26
Blocking Distance - Inches
Normalized Output Current - %
V
CE
= 5 V
DC
I
F
= 20 mA
Z-Flag Direction
Typical Output Current Vs Forward Current
0%
2%
4%
6%
8%
10%
12%
14%
16%
18%
20%
0.0 1.0 2.0 3.0 4.0 5.0
I
F
- Forward Current - mA
Normalized Output Current - %
Normalized to IF = 20mA
and V
CE
= 5VDC at T
A
= 25°
OPB420AZ - Phototransistor
OPB420BZ - R
BE
Phototransistor
OPTEK Technology Inc. — 1645 Wallace Drive, Carrollton, Texas 75006
Phone: (972) 323-2200 or (800) 341-4747 FAX: (972) 323-2396 sensors@optekinc.com www.optekinc.com
Issue A.1 11/08
Page 5 of 6
OPTEK reserves the right to make changes at any time in order to improve design and to supply the best product possible.
Slotted Optical Switch
OPB420AZ & OPB420BZ
Typical Output Current Vs Distance (Y-Axis Blocked)
0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
0.00 0.10 0.20 0.30 0.40 0.50 0.60
Blocking Distance - Inches
Normalized Output Current - %
V
CE
= 5V
DC
I
F
= 20 mA
Flag at
0.4" Flag at
0.2" Flag at
0.0"
X-Flag Direction
Y-Flag Direction
Typical Output Current Vs Distance X-Axis Blocked
0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
0.00 0.10 0.20 0.30 0.40 0.50 0.60 0.70 0.80
Blocking Distance - inches
Normalized Output Current -%
V
CE
= 5V
DC
I
F
= 20mA
Flag at
0.00 Flag at
0.15 Flag at
0.30
OPTEK Technology Inc. — 1645 Wallace Drive, Carrollton, Texas 75006
Phone: (972) 323-2200 or (800) 341-4747 FAX: (972) 323-2396 sensors@optekinc.com www.optekinc.com
Issue A.1 11/08
Page 6 of 6
OPTEK reserves the right to make changes at any time in order to improve design and to supply the best product possible.
Slotted Optical Switch
OPB420AZ & OPB42BZ
Typical Collector Current vs Collector to Emitter Voltage
0%
25%
50%
75%
100%
125%
150%
175%
200%
225%
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
VCE - Collector to Emitter Voltage - Volts
Normalized Collector Current %
Normalized to I
F
= 20mA and V
CE
= 5 VDC
I
F
=40mA
I
F
=35mA
I
F
=30mA
I
F
=25mA
I
F
=20mA
I
F
=15mA
I
F
=10mA
I
F
=5mA
Typical Output Current vs Ambient Temperature
0%
20%
40%
60%
80%
100%
120%
-40-30-20-100 1020304050607080
Ambient Temperature (°C)
Normalized Output Current
Normalized for each I
F
curre n t
at V
CC
= +5 V
DC
and T
A
= 20°C
I
F
= 20 mA and 40
I
F
= 5 mA
