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LM340T-12 Arkusz danych(PDF) 3 Page - Texas Instruments |
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LM340T-12 Arkusz danych(HTML) 3 Page - Texas Instruments |
3 / 28 page 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 Submit Documentation Feedback 3 Product Folder Links: LM340-N LM78xx |
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