R1517 Datasheet, PDF (18/38 Pages) RICOH electronics devices division – Input Voltage Range (Maximum Rating) 3.5 V to 36.0 V (50.0V)

R1517x
NO. EA−304−170112
POWER DISSIPATION (TO-252-5-P2)
Power Dissipation (PD) depends on conditions of mounting on board. This specification is based on the
measurement at the condition below:
Measurement Conditions
Ultra High Wattage Land Pattern
Standard Land Pattern
Environment
Mounting on board (Wind velocity 0 m/s)
Board Material
Glass cloth epoxy plastic
(Four-layers)
Glass cloth epoxy plastic
(Double layers)
Board
Dimensions
76.2 mm x 114.3 mm x 0.8 mm
50 mm x 50 mm x 1.6 mm
Copper Ratio
Top, Back side: Approx. 96%,
2nd, 3rd: 100%
Top side: Approx. 50%,
Back side: Approx. 50%
Through - hole
 0.4 mm x 30 pcs
 0.5 mm x 24 pcs
Measurement Result
Ultra High Wattage Land Pattern
Power
Dissipation
3800 mW
Thermal
Resistance
ja= (125-25C)/3.8 W = 26C/W
jc= 7C/W
(Ta = 25°C, Tjmax = 125°C)
Standard Land Pattern
1900 mW
ja=(125-25C)/1.9 W= 53C/W
jc= 17C/W
5000 ⁴⁸⁰⁰
4000
3800
3000
2350
On Board
(Ultra High Wattage Land Pattern)
2000
1900
1000
0
0
On Board
25 50 75 100 125 150
105
Ambient Temperature (C)
Power Dissipation
Power Dissipation vs. Ambience Temperature
76.2
50
50
Standard
Ultra High Wattage
IC Mount Area (Unit: mm)
Measurement Board Pattern
The above graph shows the Power Dissipation of the package based on Tjmax=125C and Tjmax=150C.
Operating the IC in the shaded area in the graph might have an influence it's lifetime. Operating time must be
within the time limit described in the table below, in case of operating in the shaded area.
Operating Time Estimated years(Operating four hours/day)
13,000 hours
9years
18