Revised: 09/06/17

Specifications are subject to change without notice.

©2017 Littelfuse, Inc

Thyristors

40 Amp Standard SCRs

Sxx40x Series

Figure 9: Peak Capacitor Discharge Current Derating

0.0

0.2

0.4

0.6

0.8

1.0

1.2

0255075100

125150

Case Temperature (T

32 Amp Standard High Temperature SCRs

SJxx32xx Series

10

100

1000

110100

1000

Surge Current Duration -- Full Cycles

Figure 10: Surge Peak On-State Current vs. Number of Cycles

SUPPLY FREQUENCY: 60 Hz Sinusoidal

LOAD: Resistive

RMS On-State Current: [I

Value at Specified 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

Reflow Condition

Pb – Free assembly

Pre Heat

-Temperature Min (T

150°C

-Temperature Max (T

200°C

-Time (min to max) (t

60 – 180 secs

Average ramp up rate (LiquidusTemp)

(T

5°C/second max

T

5°C/second max

Reflow

-Temperature (T

217°C

-Time (t

60 – 150 seconds

PeakTemperature (T

Time within 5°C of actual peak

Temperature (t

20 – 40 seconds

Ramp-down Rate

5°C/second max

Time 25°C to peakTemperature (T

8 minutes Max.

Do not exceed

280°C

Time

25

time to peak temperature

Preheat

Preheat

Ramp-up

Ramp-up

Ramp-down

Ramp-do