
295
2008 Littelfuse, Inc.
Revised: July 9, 2008
Teccor brand Thyristors
Specications are subject to change without notice.
Please refer to http://www.littelfuse.com for current information.
Sxx55x Series
55 Amp Standard SCRs
Specications are subject to change without notice.
Please refer to http://www.littelfuse.com for current information.
55
A
SCRs
10
100
1000
1
10
100
1000
Surge Current Duration -- Full Cycles
P
eak
Sur
g
e
(Non-r
epetitiv
e)
On-stat
e
Cur
rent
(I
TSM
)–
Amps
Figure 12: Surge Peak On-State Current vs. Number of Cycles
SUPPLY FREQUENCY: 60 Hz Sinusoidal
LOAD: Resistive
RMS On-State Current: [I
T(RMS)]: Maximum Rated
Value at Specied Case Temperature
Notes:
1. Gate control may be lost during and immediately
following surge current interval.
2. Overload may not be repeated until junction
temperature has returned to steady-state
rated value.
Soldering Parameters
Reow 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 (LiquidusTemp)
(T
L) to peak
5°C/second max
T
S(max) to TL - Ramp-up Rate
5°C/second max
Reow
-Temperature (T
L) (Liquidus)
217°C
-Temperature (t
L)
60 – 150 seconds
PeakTemperature (T
P)
260+0/-5 °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 peakTemperature (T
P)
8 minutes Max.
Do not exceed
280°C
Time
T
emperature
TP
TL
TS(max)
TS(min)
25
tP
tL
tS
time to peak temperature
Preheat
Ramp-up
Ramp-down
Ramp-do