# TLP181

Manufacturer Part NumberTLP181
DescriptionPHOTOCOUPLER TRANS-OUT 4-SMD
ManufacturerToshiba
TLP181 datasheets

## Specifications of TLP181

Number Of Channels1Input TypeDC
Voltage - Isolation3750VrmsCurrent Transfer Ratio (min)50% @ 5mA
Current Transfer Ratio (max)600% @ 5mAVoltage - Output80V
Current - Output / Channel50mACurrent - Dc Forward (if)50mA
Vce Saturation (max)400mVOutput TypeTransistor
Mounting TypeSurface MountPackage / Case4-SMD
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Page 64/80
PrevNext
9
Reading the Projected LED Operating Life Graph
For example, let's calculate the operating life of the GaAs LED, based on the data shown on page 60.
Here is an example of how to read an operating life, assuming that the ambient temperature (Ta) is 40°C and that the failure
criterion is a 30% decrease in light output.
Suppose that the initial LED current, IF, is 20 mA. Since the horizontal axis of the failure criteria graph is the reciprocal of absolute
temperature, it is necessary to convert the ambient temperature (Ta) to the reciprocal of absolute temperature (T):
1
1
T =
=
Ta + 273.15
40 + 273.15
The graph shows the projected lifetimes for F50% and F0.1% cumulative failure probabilities in solid and dashed lines respectively.
Normally, it is recommended to use F0.1% lines.
As X = 3.19, its intersection with the IF = 20 mA line for F0.1% is approximately 80,000 hours. (This figure is for reference only.)
10000000
1000000
100000
80000
10000
1000
100
2.0
227
You can also estimate the projected operating life from the projected light output degradation data.
140
120
100
80
70
60
40
20
0
1
−3
3.19 × 10
Failure criteria for light output degradation Δ P O < –30%
I
= 10mA
F
I
= 20mA
F
I
= 30mA
F
I
= 40mA
F
I
= 50mA
F
3.0
3.19
4.0
150
100 85
60
40
25
0
Test conditions: I
= 20 mA, Ta = 40°C
F
–30%
10
100
1000
Test time (h)
64
I
= 10mA
F
I
= 20mA
F
I
= 30mA
F
I
= 40mA
F
I
= 50mA
F
Projected F50%
operating life
Projected F0.1%
operating life
5.0
1/K(×10
–3
)
−20
−50
−73
Ambient Temperature (°C)
X
X-3σ
10000
100000
80000