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BF421 series datasheets. Manufacturer: Siemens.

BF421PNP silicon transistor with reverse voltage in 3-pin TO-92 package.Datasheet*)
BF423PNP silicon transistor with reverse voltage in 3-pin TO-92 package.Datasheet*)
There are other manufacturers for this components. For more information please check
BF421 (Continental Device India Ltd)
BF421 (General Semiconductor)
BF421 (Korea Electronics Co., Ltd.)
BF421 (ME)
BF421 (Motorola)
BF421 (Philips Semiconductors)
BF421 (SGS-Thomson Microelectronics)
Click here to download BF421 Datasheet
Click here to download Datasheet
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