Page 1
+
E+
D
2
0.129 (3.3)
0.119 (3.0)
0.433 (11.0)
0.422 (10.7)
0.315 (8.0)
0.110 (2.8)
0.091 (2.3)
1
3
4
0.020 (0.51) (SQ)
0.472 (12.0)
0.457 (11.6)
0.249 (6.35)
0.243 (6.15)
0.39 (1.00)
0.34 (0.85)
0.125 (3.2)
0.119 (3.0)
Ø 0.133 (3.4)
Ø 0.126 (3.2)
(2X)
0.755 (19.2)
0.745 (18.9)
L
C
C
L
L
C
Optical
C
L
0.972 (24.7)
0.957 (24.3)
.295 (7.5)
.272 (6.9)
PIN 1 ANODE
PIN 2 CATHODE
PIN 3 COLLECTOR
PIN 4 EMITTER
.073 (1.85)
.133 (3.38)
1. Derate power dissipation linearly 1.33 mW/°C above 25°C.
2. RMA flux is recommended.
3. Methanol or isopropyl alcohols are recommended as cleaning
agents.
4. Soldering iron tip
1/16” (1.6mm) minimum from housing.
PACKAGE DIMENSIONS
FEATURES
• Opaque housing
• Low cost
• .035” apertures
• High I
C(ON)
Parameter Symbol Rating Unit
Operating Temperature T
OPR
-55 to +100 °C
Storage Temperature T
STG
-55 to +100 °C
Soldering Temperature (Iron)
(2,3 and 4)
T
SOL-I
240 for 5 sec °C
Soldering Temperature (Flow)
(2 and 3)
T
SOL-F
260 for 10 sec °C
INPUT (EMITTER)
Continuous Forward Current
I
F
50 mA
Reverse Voltage V
R
6V
Power Dissipation
(1)
P
D
100 mW
OUTPUT (SENSOR)
Collector to Emitter Voltage
V
CEO
30 V
Emitter to Collector Voltage V
ECO
4.5 V
Collector Current I
C
20 mA
Power Dissipation(TC= 25°C)
(1)
P
D
150 mW
ABSOLUTE MAXIMUM RATINGS
(TA= 25°C unless otherwise specified)
NOTES:
1. Dimensions for all drawings are in inches (mm).
2. Tolerance of ± .010 (.25) on all non-nominal dimensions
unless otherwise specified.
H21A1 / H21A2 / H21A3
PHOTOTRANSISTOR
OPTICAL INTERRUPTER SWITCH
DESCRIPTION
The H21A1, H21A2 and H21A3 consist of a
gallium arsenide infrared emitting diode
coupled with a silicon phototransistor in a
plastic housing. The packaging system is
designed to optimize the mechanical
resolution, coupling efficiency, ambient light
rejection, cost and reliability. The gap in the
housing provides a means of interrupting the
signal with an opaque material, switching the
output from an “ON” to an “OFF” state.
SCHEMATIC
2001 Fairchild Semiconductor Corporation
DS300290 5/02/01 1 OF 5 www.fairchildsemi.com
1
2
4
3
Page 2
www.fairchildsemi.com 2 OF 5 5/02/01 DS300290
PARAMETER TEST CONDITIONS SYMBOL DEVICES MIN TYP MAX UNITS
INPUT (EMITTER)
Forward Voltage
I
F
= 60 mA V
F
All — — 1.7 V
Reverse Breakdown Voltage IR= 10 µAV
R
All
6.0 — — V
Reverse Leakage Current VR= 3 V I
R
All
— — 1.0 µA
OUTPUT (SENSOR)
Emitter to Collector Breakdown
I
F
= 100 µA, Ee = 0 BV
ECO
All 6.0 — — V
Collector to Emitter Breakdown IC= 1 mA, Ee = 0 BV
CEO
All
30 — — V
Collector to Emitter Leakage VCE= 25 V, Ee = 0 I
CEO
All
— — 100 nA
COUPLED
H21A1
0.15 — —
I
F
= 5 mA, VCE= 5 V
H21A2 0.30
——
H21A3 0.60
——
H21A1
1.0 — —
On-State Collector Current I
F
= 20 mA, VCE= 5 V I
C(ON)
H21A2
2.0 — — mA
H21A3
4.0 — —
H21A1
1.9 — —
I
F
= 30 mA, VCE= 5 V
H21A2
3.0 — —
H21A3
5.5 — —
Saturation Voltage
I
F
= 20 mA, IC= 1.8 mA
V
CE(SAT)
H21A2/3 — — 0.40 V
I
F
= 30 mA, IC= 1.8 mA H21A1 — — 0.40 V
Turn-On Time
IF= 30 mA, VCC= 5 V, RL= 2.5 KΩ
t
on
All
—8 —µs
Turn-Off Time
IF= 30 mA, VCC= 5 V, RL= 2.5 KΩ
t
off
All
—50 —µs
ELECTRICAL / OPTICAL CHARACTERISTICS (T
A
=25°C)(All measurements made under pulse condition)
H21A1 / H21A2 / H21A3
PHOTOTRANSISTOR
OPTICAL INTERRUPTER SWITCH
Page 3
DS300290 5/02/01 3 OF 5 www.fairchildsemi.com
H21A1 / H21A2 / H21A3
PHOTOTRANSISTOR
OPTICAL INTERRUPTER SWITCH
10
8
6
4
2
1
.8
.6
.4
.2
, NORMALIZED OUTPUT CURRENT
.1
CE(on)
.08
I
.06
.04
.02
.01
1
2 4 6 8 10 20 40 60 80 100 200 400 600 1000
Figure 2. Output Current vs. Temperature
10
Figure 1. Output Current vs. Input Current
8
6
4
2
1
.8
.6
, NORMALIZED OUTPUT CURRENT
.4
CE(on)
I
NORMALIZED TO
INPUT PULSED
VCE = 5 V,
NORMALIZED TO
IF = 20 mA
= 5 V
V
CE
PULSED
P
= 100 µsec
W
PRR
= 100 pps
I
, INPUT CURRENT (mA)
F
IF = 20 mA, TA = 25 °C
IF = 100 mA
IF = 60 mA
IF = 30 mA
IF = 20 mA
IF = 10 mA
.2
.1
3
2
, NORMALIZED
CE(SAT)
1
V
0.8
0.6
-55 -40 -20 0 20 60 8040 100
TA, AMBIENT TEMPERATURE (°C)
Figure 3. V
NORMALIZED TO
I
= 1.8 mA
C
, TA = 25°C
30 mA
I
F
PULSED
PW = 100 µs, PRR = 100 pps
-50 -25 0 25 50 75 100
TA, AMBIENT TEMPERATURE (°C)
vs. Temperature
CE(SAT)
I
IF20 mA
I
IF60 mA
= 1.8 mA
C
= 3.6 mA
C
I
= 1.8 mA
C
IF30 mA
I
= 0.9 mA
C
IF15 mA
IF = 5 mA
Page 4
www.fairchildsemi.com 4 OF 5 5/02/01 DS300290
H21A1 / H21A2 / H21A3
PHOTOTRANSISTOR
OPTICAL INTERRUPTER SWITCH
Figure 4. Leakage Current vs. Temperature
DETECTOR
EMITTER
Figure 5. Switching Speed vs. RL
4.5
4
PW = 300 µs
3
2
NORMALIZED
1.5
OFF
, AND t
1
ON
.9
t
.8
.7
.6
.5
.45
PRR = 100 pps
75
IF =
AMPS, VCC = 5V
R
L
NORMALIZED TO
= 2.5 KΩ
R
L
1K 2K 3K
3
10
2
10
VCE = 25 V
1
10
, NORMALIZED DARK CURRENT
CEO
I
1
NORMALIZED TO
V
CE
TA = 25 °C
0.1
25
, LOAD RESISTANCE (Ω)
R
L
50 75 100
T
, AMBIENT TEMPERATURE (°C)
A
t
on
IF
4K 5K 6K 7K 8K 9K 10K
= 25 V
VCE = 10 V
t
off
R
L
V
CC
3
10
2
10
1
10
, NORMALIZED LEAKAGE CURRENT
R
I
1
NORMALIZED TO
V
= 5 V
R
TA = 25 °C
0.1
25
50 75 100
TA, AMBIENT TEMPERATURE (°C)
Figure 6. Output Current vs. Distance
d, DISTANCE (mils)
1.00
.1
.01
+
, NORMALIZED OUTPUT CURRENT
.001
CE(on)
I
.0001
0246810
78.7 157.5 236.2 315 393.7
NORMALIZED
TO VALUE WITH
SHIELD
REMOVED
+
BLACK
SHIELD
D
+E
d
o
d, DISTANCE (mm)
BLACK
SHIELD
d
o
Page 5
DISCLAIMER
FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO
ANY PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. FAIRCHILD DOES NOT ASSUME
ANY LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED
HEREIN; NEITHER DOES IT CONVEY ANY LICENSE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF
OTHERS.
LIFE SUPPORT POLICY
FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT
DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD
SEMICONDUCTOR CORPORATION. As used herein:
1. Life support devices or systems are devices or
systems which, (a) are intended for surgical
implant into the body,or (b) support or sustain life,
and (c) whose failure to perform when properly
used in accordance with instructions for use provided
in labeling, can be reasonably expected to result in a
significant injury of the user.
2. A critical component in any component of a life support
device or system whose failure to perform can be
reasonably expected to cause the failure of the life
support device or system, or to affect its safety or
effectiveness.
DS300290 5/02/01 5 OF 5 www.fairchildsemi.com
H21A1 / H21A2 / H21A3
PHOTOTRANSISTOR
OPTICAL INTERRUPTER SWITCH
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