MUR405, MUR410, MUR415, MUR420, MUR440, MUR460
NOTE 2 — AMBIENT MOUNTING DATA
Data shown for thermal resistance junction−to−ambient
(R ) for the mountings shown is to be used as typical
qJA
guideline values for preliminary engineering or in case the
tie point temperature cannot be measured.
TYPICAL VALUES FOR R
IN STILL AIR
q
JA
Lead Length, L (IN)
Mounting
Method
1/8
50
58
1/4
51
59
1/2
53
61
3/4
55
63
Units
°C/W
°C/W
°C/W
1
2
3
R
q
JA
28
MOUNTING METHOD 1
P.C. Board Where Available Copper
Surface area is small.
L
L
MOUNTING METHOD 2
Vector Push−In Terminals T−28
L
L
MOUNTING METHOD 3
P.C. Board with
″
″
1−1/2 x 1−1/2 Copper Surface
L = 1/2″
Board Ground Plane
http://onsemi.com
6
ONSEMI [ ONSEMI ]
