Littelfuse STxxx Series Manual do Utilizador descarregar pdf (Página 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 (35

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

Temperature

T

P

T

L

T

S(max)

T

S(min)

25

t

P

t

L

t

S

time to peak temperature

Preheat

P

reheat

Ramp-upRamp-up

Ramp-down

R

am

p

-

do

1 2 3 4 5 6 7 8

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