AC INPUT PHOTOTRANSISTOR
SMALL OUTLINE SURFACE MOUNT
OPTOCOUPLERS
MOC256-M
DESCRIPTION
The MOC256-M is an AC input phototransistor optocoupler. The device consists of two infra-
red emitters connected in anti-parallel and coupled to a silicon NPN phototransistor detector.
It is designed for applications requiring the detection or monitoring of AC signals. The device
is constructed with a standard SOIC-8 footprint.
FEATURES
• UL Recognized File (#E90700, Volume 2)
• VDE recognized (File #136616)
- Ordering option V (i.e. MOC256V-M)
• Industry Standard SOIC-8 Surface Mountable Package, with 0.050" lead spacing
• Available in Tape and Reel Option
• Bidirectional AC Input (Protection Against Reversed DC Bias)
• Guaranteed CTR Symmetry of 2:1 Maximum
• High Input-Output Isolation of 2500 Vac (rms) Guaranteed
AC IN 1
8 N/C
AC IN 2
7 BASE
N/C 3
6 COLLECTOR
N/C 4
5 EMITTER
ABSOLUTE MAXIMUM RATINGS
(T
A
= 25°C Unless otherwise specified)
Rating
EMITTER
Forward Current - Continuous
Forward Current - Peak (PW = 100 µs, 120 pps)
LED Power Dissipation @ T
A
= 25°C
Derate above 25°C
DETECTOR
Collector-Emitter Voltage
Emitter-Base Voltage
Collector Current-Continuous
Detector Power Dissipation @ T
A
= 25°C
Derate above 25°C
TOTAL DEVICE
Input-Output Isolation Voltage
(f = 60 Hz, t = 1 min.)
Total Device Power Dissipation @ T
A
= 25°C
Derate above 25°C
Ambient Operating Temperature Range
Storage Temperature Range
V
ISO
P
D
T
A
T
stg
2500
250
2.94
-40 to +100
-40 to +150
Vac(rms)
mW
mW/°C
°C
°C
V
CEO
V
ECO
I
C
P
D
30
7.0
150
150
1.76
V
V
mA
mW
mW/°C
I
F
I
F
(pk)
P
D
60
1.0
90
0.8
mA
A
mW
mW/°C
Symbol
Value
Unit
© 2003 Fairchild Semiconductor Corporation
Page 1 of 7
4/10/03
AC INPUT PHOTOTRANSISTOR
SMALL OUTLINE SURFACE MOUNT
OPTOCOUPLERS
MOC256-M
ELECTRICAL CHARACTERISTICS
(T
A
= 25°C unless otherwise specified)
Parameter
EMITTER
Input Forward Voltage
Input Capacitance
DETECTOR
Collector-Emitter Dark Current
Collector-Base Dark Current
Collector-Emitter Breakdown Voltage
Collector-Base Breakdown Voltage
Emitter-Collector Breakdown Voltage
Collector-Emitter Capacitance
Collector-Base Capacitance
Emitter-Base Capacitance
COUPLED
Current Transfer Ratio
(1)
Output-Collector Current Symmetry
Collector-Emitter Saturation Voltage
Isolation Surge Voltage
(2,3)
Isolation Resistance
(3)
Isolation Capacitance
(3)
* Typical values at T
A
= 25°C
NOTE:
1. Current Transfer Ratio (CTR) = I
C
/I
F
x 100%.
2. Isolation Surge Voltage, V
ISO
, is an internal device dielectric breakdown rating.
3. For this test, Pins 1 and 2 are common and Pins 5, 6 and 7 are common.
(I
F
= ±10 mA, V
CE
= 10 V)
CTR
—
V
CE (sat)
V
ISO
R
ISO
C
ISO
20
0.5
—
2500
10
11
—
0.1
—
—
0.2
150
—
2.0
0.4
—
—
—
%
—
V
Vac(rms)
Ω
pF
(V
CE
= 10 V, T
A
= 25°C)
(V
CE
= 10 V, T
A
= 100°C)
(V
CB
= 10V)
(I
C
= 10 mA)
(I
C
= 100 µA)
(I
E
= 100 µA)
(f = 1.0 MHz, V
CE
= 0)
(f = 1.0 MHz, V
CB
= 0)
(f = 1.0 MHz, V
EB
= 0)
I
CEO1
I
CEO2
I
CBO
BV
CEO
BV
CBO
BV
ECO
C
CE
C
CB
C
EB
—
—
—
30
70
5
—
—
—
1.0
1.0
0.2
100
120
10
7
20
10
100
—
—
—
—
—
—
—
—
nA
µA
nA
nA
V
V
pF
pF
pF
(I
F
= ±10 mA)
(V = 0 V, f = 1 MHz)
V
F
C
J
—
—
1.2
20
1.5
—
V
pF
Test Conditions
Symbol
Min
Typ*
Max
Unit
(
(I
C
@ I
F
= +10 mA, V
CE
= 10V)
(I
C
@ I
F
= -10 mA, V
CE
= 10V)
)
(I
C
= 0.5 mA, I
F
= ±10 mA)
(f = 60 Hz AC Peak, t = min)
(V = 500 V)
(V = 0 V, f = 1 MHz)
© 2003 Fairchild Semiconductor Corporation
Page 2 of 7
4/10/03
AC INPUT PHOTOTRANSISTOR
SMALL OUTLINE SURFACE MOUNT
OPTOCOUPLERS
MOC256-M
Fig. 1 Input Voltage vs. Input Current
100
80
60
10
Fig. 2 Output Curent vs. Input Current
I
C
- OUTPUT COLLECTOR CURRENT (NORMALIZED)
I
F
- INPUT CURRENT (mA)
40
20
0
-20
-40
-60
-80
-100
-2.0
1
V
CE
= 5V
NORMALIZED TO I
F
= 10mA
0.1
-1.5
-1.0
-0.5
0.0
0.5
1.0
1.5
2.0
V
F
- INPUT VOLTAGE (V)
0.01
0.1
1
10
100
Fig. 3 Output Current vs. Ambient Temperature
10
I
F
- LED INPUT CURRENT (mA)
Fig. 4 Output Current vs. Collector - Emitter Voltage
I
C
- OUTPUT COLLECTOR CURRENT (NORMALIZED)
1.6
I
C
- OUTPUT COLLECTOR CURRENT (NORMALIZED)
1.4
1.2
1.0
1
0.8
0.6
0.4
0.2
I
F
= 10mA
NORMALIZED TO V
CE
= 5V
0.0
0
1
2
3
4
5
6
7
8
9
10
NORMALIZED TO T
A
= 25
o
C
0.1
-80
-60
-40
-20
0
20
40
60
o
80
100
120
T
A
- AMBIENT TEMPERATURE ( C)
V
CE
- COLLECTOR -EMITTER VOLTAGE (V)
Fig. 5 Dark Current vs. Ambient Temperature
10000
I
CEO
- COLLECTOR -EMITTER DARK CURRENT (nA)
1000
V
CE
=10V
100
10
1
0.1
0
20
40
60
o
80
100
T
A
- AMBIENT TEMPERATURE ( C)
© 2003 Fairchild Semiconductor Corporation
Page 3 of 7
4/10/03
AC INPUT PHOTOTRANSISTOR
SMALL OUTLINE SURFACE MOUNT
OPTOCOUPLERS
MOC256-M
Package Dimensions (Surface Mount)
8-Pin Small Outline
0.024 (0.61)
0.164 (4.16)
0.144 (3.66)
SEATING PLANE
0.060 (1.52)
PIN1
0.202 (5.13)
0.182 (4.63)
0.275 (6.99)
0.155 (3.94)
0.010 (0.25)
0.006 (0.16)
0.143 (3.63)
0.123 (3.13)
0.021 (0.53)
0.011 (0.28)
0.008 (0.20)
0.003 (0.08)
0.050 (1.27)
TYP
0.244 (6.19)
0.224 (5.69)
0.050 (1.27)
Lead Coplanarity : 0.004 (0.10) MAX
© 2003 Fairchild Semiconductor Corporation
Page 4 of 7
4/10/03
AC INPUT PHOTOTRANSISTOR
SMALL OUTLINE SURFACE MOUNT
OPTOCOUPLERS
MOC256-M
ORDERING INFORMATION
Option
V
R1
R1V
R2
R2V
Order Entry Identifier
V
R1
R1V
R2
R2V
Description
VDE 0884
Tape and reel (500 units per reel)
VDE 0884, Tape and reel (500 units per reel)
Tape and reel (2500 units per reel)
VDE 0884, Tape and reel (2500 units per reel)
MARKING INFORMATION
1
256
V
X YY S
2
6
3
4
5
Definitions
1
2
3
4
5
6
Fairchild logo
Device number
VDE mark (Note: Only appears on parts ordered with VDE
option – See order entry table)
One digit year code, e.g., ‘3’
Two digit work week ranging from ‘01’ to ‘53’
Assembly package code
© 2003 Fairchild Semiconductor Corporation
Page 5 of 7
4/10/03
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