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LM340SX-5.0 데이터시트(PDF) 3 Page - Texas Instruments

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부품명 LM340SX-5.0
상세설명  LM340-N/LM78XX Series 3-Terminal Positive Regulators
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제조업체  TI [Texas Instruments]
홈페이지  http://www.ti.com
Logo TI - Texas Instruments

LM340SX-5.0 데이터시트(HTML) 3 Page - Texas Instruments

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LM340-N, LM78xx
www.ti.com
SNOSBT0I – FEBRUARY 2000 – REVISED MARCH 2013
Operating Conditions
(1) (continued)
LM140
−55°C to +125°C
Temperature Range (TA)
(2)
LM340A, LM340-N
0°C to +125°C
LM7808C
0°C to +125°C
(2)
The maximum allowable power dissipation at any ambient temperature is a function of the maximum junction temperature for operation
(TJMAX = 125°C or 150°C), the junction-to-ambient thermal resistance (θJA), and the ambient temperature (TA). PDMAX = (TJMAX
TA)/θJA. If this dissipation is exceeded, the die temperature will rise above TJMAX and the electrical specifications do not apply. If the die
temperature rises above 150°C, the device will go into thermal shutdown. For the TO-3 package (NDS), the junction-to-ambient thermal
resistance (
θJA) is 39°C/W. When using a heatsink, θJA is the sum of the 4°C/W junction-to-case thermal resistance (θJC) of the TO-3
package and the case-to-ambient thermal resistance of the heatsink. For the TO-220 package (NDE),
θJA is 54°C/W and θJC is 4°C/W. If
SOT-223 is used, the junction-to-ambient thermal resistance is 174°C/W and can be reduced by a heatsink (see Applications Hints on
heatsinking).If the DDPAK\TO-263 package is used, the thermal resistance can be reduced by increasing the PC board copper area
thermally connected to the package: Using 0.5 square inches of copper area,
θJA is 50°C/W; with 1 square inch of copper area, θJAis
37°C/W; and with 1.6 or more inches of copper area,
θJA is 32°C/W.
Copyright © 2000–2013, Texas Instruments Incorporated
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