SQ1539EH

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Vishay Siliconix

S15-1925-Rev. A, 17-Aug-15

6

Document Number: 62993

THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT

Normalized Thermal Transient Impedance, Junction-to-Ambient

Normalized Thermal Transient Impedance, Junction-to-Foot

Note

• The characteristics shown in the two graphs

- Normalized Transient Thermal Impedance Junction-to-Ambient (25 °C)

- Normalized Transient Thermal Impedance Junction-to-Case (25 °C)

are given for general guidelines only to enable the user to get a “ball park” indication of part capabilities. The data are extracted from single

pulse transient thermal impedance characteristics which are developed from empirical measurements. The latter is valid for the part

mounted on printed circuit board - FR4, size 1" x 1" x 0.062", double sided with 2 oz. copper, 100 % on both sides. The part capabilities

can widely vary depending on actual application parameters and operating conditions.

1

10

600

100

2

1

0.1

0.01

0.2

0.1

0.05

Single Pulse

Duty Cycle = 0.5

Square Wave Pulse Duration (s)

1. Duty Cycle, D =

Notes:

4. Surface Mounted

0.02

110

2

1

0.1

0.01

0.2

0.1

0.05

Single Pulse

Duty Cycle = 0.5

Square Wave Pulse Duration (s)

0.02