TFDU5307
Document Number 82616
Rev. 1.6, 02-Mar-07
Vishay Semiconductors
www.vishay.com
251
Current Derating Diagram
Figure 6 shows the maximum operating temperature
when the device is operated without external current
limiting resistor. A power dissipating resistor of 2 Ω is
recommended from the cathode of the IRED to
Ground for supply voltages above 4 V. In that case
the device can be operated up to 85 °C, too.
Figure 4. Solder Profile, RSS Recommendation
Figure 5. RTS Recommendation
0
25
50
75
100
125
150
175
200
225
250
275
0 50 100 150 200 250 300 350
Time/s
Temperature/°C
T
≥
255 °C for 10 s....30 s
19532
0
20
40
60
80
100
120
140
160
180
200
220
240
260
280
0 50 100 150 200 250 300
Time/s
Temperature/°C
< 4 °C/s
1.3 °C/s
Time above 217 °C t
≤
70 s
Time above 250 °C t
≤
40 s
Peak temperature T
peak
= 260 °C
< 2 °C/s
T
peak
= 260 °C max
Figure 6. Temperature Derating Diagram
50
55
60
65
70
75
80
85
90
2.0 2.5 3.0 3.5 4.0
4.5
5.0 5.5 6.0
Operating Voltage [V] at duty cycle 20 %
Ambient Temperature (°C )
18097
