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)
0.103 (2.60) NOM
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
PACKAGE DIMENSIONS
FEATURES
• Opaque housing
• Low cost
• .035” apertures
• High I
C(ON)
NOTES:
1. Dimensions for all drawings are in inches (mm).
2. Tolerance of ± .010 (.25) on all non-nominal dimensions
unless otherwise specified.
PHOTOTRANSISTOR
OPTICAL INTERRUPTER SWITCH
DESCRIPTION
The H21A series are gallium arsenide infrared emitting diode coupled with a silicon photodarlington 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
DS300291 6/05/01 1 OF 4 www.fairchildsemi.com
H21A4 H21A5 H21A6
1
2
4
3
Page 2
www.fairchildsemi.com 2 OF 4 6/05/01 DS300291
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 — — µA
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
55 — — V
Collector to Emitter Leakage VCE= 45 V, Ee = 0 I
CEO
All
— — 100 nA
COUPLED
H21A4
0.15 — —
I
F
= 5 mA, VCE= 5 V
H21A5 0.30
——
H21A6 0.60
——
H21A4
1.0 — —
On-State Collector Current I
F
= 20 mA, VCE= 5 V I
C(ON)
H21A5
2.0 — — mA
H21A6
4.0 — —
H21A4
1.9 — —
I
F
= 30 mA, VCE= 5 V
H21A5
3.0 — —
H21A6
5.5 — —
Saturation Voltage
I
F
= 20 mA, IC= 1.8 mA
V
CE(SAT)
H21A5/6 — — 0.40 V
I
F
= 30 mA, IC= 1.8 mA H21A4 — — 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
(TA =25°C) (All measurements made under pulse conditions)
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
55 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)
NOTE:
1. Derate power dissipation linearly 1.67 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.
PHOTOTRANSISTOR
OPTICAL INTERRUPTER SWITCH
H21A4 H21A5 H21A6
Page 3
DS300291 6/05/01 3 OF 4 www.fairchildsemi.com
PHOTOTRANSISTOR
OPTICAL INTERRUPTER SWITCH
H21A4 H21A5 H21A6
TYPICAL PERFORMANCE CURVES
10
Figure 1. Output Current vs. Input Current
8
6
4
2
1
.8
.6
.4
.2
.1
.08
, NORMALIZED OUTPUT CURRENT
.06
.04
CE(on)
I
.02
.01
1
2 4 6 8 10 20 40 60 80 100 200 400 600 1000
3
NORMALIZED TO
I
2
I
PULSED
PW = 100 µs, PRR = 100 pps
, NORMALIZED
1
CE(SAT)
V
0.8
0.6
Figure 3. V
= 1.8 mA
C
30 mA
F
-50 -25 0 25 50 75 100
CE(SAT)
= 25°C
, T
A
TA, AMBIENT TEMPERATURE (°C)
NORMALIZED TO
IF = 20 mA
= 5 V
V
CE
PULSED
P
= 100 µsec
W
PRR
= 100 pps
IF, INPUT CURRENT (mA)
vs. Temperature
= 1.8 mA
I
C
IF20 mA
= 3.6 mA
I
C
IF60 mA
I
= 1.8 mA
C
IF30 mA
= 0.9 mA
I
C
IF15 mA
10
8
6
2
.8
.6
.4
, NORMALIZED OUTPUT CURRENT
CE(on)
I
.2
.1
NORMALIZED TO
INPUT PULSED
4
1
-55 -40 -20 0 20 60 8040 100
V
Figure 4. Leakage Current vs. Temperature
DETECTOR
3
10
2
10
VCE = 45 V
VCE = 10 V
1
10
, NORMALIZED DARK CURRENT
1
CEO
Figure 2. Output Current vs. Temperature
I
0.1
25
TA, AMBIENT TEMPERATURE (°C)
NORMALIZED TO
V
= 45 V
CE
TA = 25 °C
50 75 100
IF = 5 mA, TA = 25 °C
= 1.5 V,
CE
IF = 30 mA
IF = 20 mA
TA, AMBIENT TEMPERATURE (°C)
3
10
2
10
1
10
1
, NORMALIZED LEAKAGE CURRENT
R
I
0.1
25
TA, AMBIENT TEMPERATURE (°C)
IF = 100 mA
IF = 60 mA
IF = 10 mA
IF = 5 mA
EMITTER
NORMALIZED TO
V
= 5 V
CE
TA = 25 °C
50 75 100
Figure 6. Output Current vs. Distance
4.5
4
3
2
NORMALIZED
1.5
OFF
, AND t
1
ON
.9
t
.8
.7
.6
.5
.45
1K 2K 3K
Figure 5. Switching Speed vs. RL
PW = 300 µs
PRR = 100 pps
7.5
I
=
AMPS, VCC = 5V
F
R
L
NORMALIZED TO
R
= 2.5 KΩ
L
IF
4K 5K 6K 7K 8K 9K 10K
RL, LOAD RESISTANCE (Ω)
1.00
t
on
t
off
R
L
+
V
CC
.1
.01
, NORMALIZED OUTPUT CURRENT
.001
CE(on)
I
.0001
0246810
78.7 157.5 236.2 315 393.7
BLACK
SHIELD
+
D
d
+
E
o
d, DISTANCE (mils)
d, DISTANCE (mm)
NORMALIZED
TO VALUE WITH
SHIELD
REMOVED
BLACK
SHIELD
d
o
Page 4
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.
PHOTOTRANSISTOR
OPTICAL INTERRUPTER SWITCH
H21A4 H21A5 H21A6
www.fairchildsemi.com 4 OF 4 6/05/01 DS300291
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