The recommended land pattern for the CR1206-FX-4321ELF is a rectangular pad with a size of 1.3 mm x 0.8 mm, with a solder mask clearance of 0.1 mm. This can be found in the Bourns application note 'Chip Resistor Land Pattern' (document number 3281).
The CR1206-FX-4321ELF is a general-purpose thick-film chip resistor, and its frequency response is not optimized for high-frequency applications. For high-frequency applications, Bourns recommends using their thin-film chip resistors, such as the CR1206-FX-4321ELF-TF.
The CR1206-FX-4321ELF is not AEC-Q200 qualified, which is a common requirement for automotive applications. However, Bourns offers AEC-Q200 qualified chip resistors, such as the CR1206-FX-4321ELF-A, which can be used in automotive applications.
The CR1206-FX-4321ELF has a moisture sensitivity level (MSL) of 1, which means it can withstand a maximum of 30 days of exposure to a relative humidity of 60% at 30°C without being baked.
The CR1206-FX-4321ELF has a maximum operating temperature of 150°C, and its power rating is derated above 125°C. For high-temperature applications, Bourns recommends using their high-temperature chip resistors, such as the CR1206-FX-4321ELF-HT.
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