Littelfuse STxxx Series - Manual (Page 4)

340
Revised: July 9, 2008
©2008 Littelfuse, Inc.
Teccor ® brand Thyristors
Specifications are subject to change without notice.
Please refer to http://www.littelfuse.com for current information.
Specifications are subject to change without notice.
Please refer to http://www.littelfuse.com for current information.
Standard Bidirectional DIAC Trigger
HTxxx & HTMxxx & STxxx Series
Figure 6: Circuit Used to Measure DIAC
Characteristics (Refer to Figure 4)
Figure 7: Peak Output Current vs. Triggering
Capacitance (Per Figure 5 with R
L
of 20 Ω)
120 V rms
60 Hz
47 k
D.U.T.
R
L
20
1%
V
C
100 k
*
C
T
I
L
0.1 μF
* Adjust for one firing in each half cycle. D.U.T. = Diac
Triggering Capacitance (C
T
) – μF
Peak Output Current (I
PK
) – mA
0
50
100
150
200
250
300
.01 .02 .03 .04 .05 .06 .07 .08 .09 .10
Typical (3
5 V Device)
Soldering Parameters
Reflow Condition Pb – Free assembly
Pre Heat
- Temperature Min (T
s(min)
) 150°C
- Temperature Max (T
s(max)
) 200°C
- Time (min to max) (t
s
) 60 – 190 secs
Average ramp up rate (Liquidus Temp
(T
L
) to peak
5°C/second max
T
S(max)
to T
L
- Ramp-up Rate 5°C/second max
Reflow
- Temperature (T
L
) (Liquidus) 217°C
- Time (min to max) (t
s
) 60 – 150 seconds
Peak Temperature (T
P
) 260 °C
Time within 5°C of actual peak
Temperature (t
p
)
20 – 40 seconds
Ramp-down Rate 5°C/second max
Time 25°C to peak Temperature (T
P
) 8 minutes Max.
Do not exceed 280°C
Time
T
emperature
T
P
T L
T
S(max)
T
S(min)
25
t
P
t
L
t
S
time to peak temperature
Preheat Preheat
Ramp-up Ramp-up
Ramp-down Ramp-do