OT407_1 © NXP B.V. 2008. All rights reserved.
Product data sheet Rev. 01 — 19 May 2008 5 of 12
NXP Semiconductors
OT407
Four-quadrant triac, enhanced noise immunity
5. Thermal characteristics
Table 4. Thermal characteristics
Symbol Parameter Conditions Min Typ Max Unit
R
th(j-lead)
thermal resistance from junction to
lead
full cycle; see Figure 6 --60K/W
R
th(j-a)
thermal resistance from junction to
ambient
full cycle; printed-circuit
board mounted; lead
length = 4 mm
- 150 - K/W
Fig 6. Transient thermal impedance from junction to lead as a function of pulse width
10
−1
10
−2
1
10
Z
th(j-lead)
(K/W)
t
p
(s)
10
−5
110
10
−1
10
−2
10
−4
10
−3
10
2
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t
p
P
t