LM137K/883 National Semiconductor, LM137K/883 Datasheet - Page 5

• Manufacturer Part Number: LM137K/883
• Description: Standard Regulator Neg -1.2V to -37V 1.5A 3-Pin (2+Tab) TO-3 Tray
• Manufacturer: National Semiconductor
• Type: Linearr

Specifications of LM137K/883

• Package: 3TO-3
• Function: Standard
• Number Of Outputs: 1
• Input Voltage Range: -40 to -4.2 V
• Output Voltage: -1.2 to -37 V
• Maximum Output Current: 1.5 A
• Output Type: Adjustable
• Operating Temperature: -55 to 150 °C
• Polarity: Negative
• Reference Voltage: -1.275 V

Connection Diagrams
Application Hints
When a value for θ
a heatsink must be selected that has a value that is less than
or equal to this number.
HEATSINKING SOT-223 PACKAGE PARTS
The SOT-223 (“MP”) packages use a copper plane on the
PCB and the PCB itself as a heatsink. To optimize the heat
sinking ability of the plane and PCB, solder the tab of the
package to the plane.
Figures 3, 4 show the information for the SOT-223 package.
Figure 4 assumes a θ
51˚C/W for 2 ounce copper and a maximum junction tem-
perature of 125˚C.
FIGURE 3. θ
See NS Package Number T03B
(J−A)
Order Number LM337T
(H−A)
SOT-223 Package
vs Copper (2 ounce) Area for the
(J−A)
Plastic Package
is found using the equation shown,
Front View
of 75˚C/W for 1 ounce copper and
TO-220
(Continued)
00906707
00906732
5
Package Marked N02A See NS Package Number MP04A
Please see AN1028 for power enhancement techniques to
be used with the SOT-223 package.
FIGURE 4. Maximum Power Dissipation vs. T
Order Number LM337IMP
the SOT-223 Package
3-Lead SOT-223
Front View
00906734
00906733
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AMB
for