S-19400 Datasheet, PDF (28/36 Pages) Seiko Instruments Inc – Watchdog operation voltage range

FOR AUTOMOTIVE 125°C OPERATION LOW CURRENT CONSUMPTION WATCHDOG TIMER WITH RESET FUNCTION
S-19400/19401 Series
Rev.2.1_00
2. HSNT-8(2030)
1.0
T_j = +125°C max.
0.8
Board 2
0.74 W
0.6
Board 1
0.55 W
0.4
0.2
0
0
50
100
150
Ambient temperature (Ta) [C]
Figure 44 Power Dissipation of Package (When Mounted on Board)
2. 1 Board 1
76.2 mm
Figure 45
Item
Thermal resistance value
(θ_ja)
Size
Material
Number of copper foil layer
1
Copper foil layer
2
3
4
Thermal via
Table 12
Specification
181°C/W
114.3 mm × 76.2 mm × t1.6 mm
FR-4
2
Land pattern and wiring for testing: t0.070 mm
−
−
74.2 mm × 74.2 mm × t0.070 mm
−
2. 2 Board 2
76.2 mm
Figure 46
Item
Thermal resistance value
(θ_ja)
Size
Material
Number of copper foil layer
1
Copper foil layer
2
3
4
Thermal via
Table 13
Specification
135°C/W
114.3 mm × 76.2 mm × t1.6 mm
FR-4
4
Land pattern and wiring for testing: t0.070 mm
74.2 mm × 74.2 mm × t0.035 mm
74.2 mm × 74.2 mm × t0.035 mm
74.2 mm × 74.2 mm × t0.070 mm
−
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