S-19400 Datasheet, PDF (27/36 Pages) Seiko Instruments Inc – Watchdog operation voltage range

FOR AUTOMOTIVE 125°C OPERATION LOW CURRENT CONSUMPTION WATCHDOG TIMER WITH RESET FUNCTION
Rev.2.1_00
S-19400/19401 Series
 Thermal Characteristics
1. TMSOP-8
1.0
Board 2
0.8 0.75 W
Tj = 125C max.
0.6
Board 1
0.63 W
0.4
0.2
0
0
50
100
150
Ambient temperature (Ta) [C]
Figure 41 Power Dissipation of Package (When Mounted on Board)
1. 1 Board 1
76.2 mm
Figure 42
Item
Thermal resistance value
(θ_ja)
Size
Material
Number of copper foil layer
1
Copper foil layer
2
3
4
Thermal via
Table 10
Specification
160°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
−
1. 2 Board 2
76.2 mm
Figure 43
Item
Thermal resistance value
(θ_ja)
Size
Material
Number of copper foil layer
1
Copper foil layer
2
3
4
Thermal via
Table 11
Specification
133°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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