SQ1912EH
www.vishay.com
Vishay Siliconix
S17-0425 Rev. B, 27-Mar-17
5
Document Number: 67394
For technical questions, contact: automostechsupport@vishay.com
THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT
ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000
THERMAL RATINGS (T
A
= 25 °C, unless otherwise noted)
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-Foot (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.
Vishay Siliconix maintains worldwide manufacturing capability. Products may be manufactured at one of several qualified locations. Reliability data for Silicon
Technology and Package Reliability represent a composite of all qualified locations. For related documents such as package/tape drawings, part marking, and
reliability data, see www.vishay.com/ppg?67394
.
10
-3
10
-2
00601110
-1
10
-4
100
2
1
0.1
0.01
0.2
0.1
0.05
Single Pulse
Duty Cycle = 0.5
Square Wave Pulse Duration (s)
Normalized Effective Transient
Thermal Impedance
1. Duty Cycle, D =
2. Per Unit Base = R
thJA
= 220 °C/W
3. T
JM
- T
A
= P
DM
Z
thJA
(t)
t
1
t
2
t
1
t
2
Notes:
4. Surface Mounted
P
DM
0.02
10
-3
10
-2
01110
-1
10
-4
2
1
0.1
0.01
0.2
0.1
0.05
Single Pulse
Duty Cycle = 0.5
Square Wave Pulse Duration (s)
Normalized Effective Transient
Thermal Impedance
0.02
