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NTQD6968 Datasheet(PDF) 6 Page - ON Semiconductor |
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NTQD6968 Datasheet(HTML) 6 Page - ON Semiconductor |
6 / 8 page NTQD6968 http://onsemi.com 6 INFORMATION FOR USING THE TSSOP–8 SURFACE MOUNT PACKAGE RECOMMENDED FOOTPRINT FOR SURFACE MOUNTED APPLICATIONS Surface mount board layout is a critical portion of the total design. The footprint for the semiconductor packages must be the correct size to ensure proper solder connection interface between the board and the package. With the correct pad geometry, the packages will self align when subjected to a solder reflow process. mm inches 0.038 0.95 0.252 6.4 0.018 0.45 0.026 0.65 0.177 4.5 SOLDERING PRECAUTIONS The melting temperature of solder is higher than the rated temperature of the device. When the entire device is heated to a high temperature, failure to complete soldering within a short time could result in device failure. Therefore, the following items should always be observed in order to minimize the thermal stress to which the devices are subjected. • Always preheat the device. • The delta temperature between the preheat and soldering should be 100 °C or less.* • When preheating and soldering, the temperature of the leads and the case must not exceed the maximum temperature ratings as shown on the data sheet. When using infrared heating with the reflow soldering method, the difference shall be a maximum of 10 °C. • The soldering temperature and time shall not exceed 260 °C for more than 10 seconds. • When shifting from preheating to soldering, the maximum temperature gradient shall be 5 °C or less. • After soldering has been completed, the device should be allowed to cool naturally for at least three minutes. Gradual cooling should be used as the use of forced cooling will increase the temperature gradient and result in latent failure due to mechanical stress. • Mechanical stress or shock should not be applied during cooling. * * Soldering a device without preheating can cause excessive thermal shock and stress which can result in damage to the device. * * Due to shadowing and the inability to set the wave height to incorporate other surface mount components, the D2PAK is not recommended for wave soldering. |
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