View 2sa1857 datasheet:

Ordering number:EN4644 PNP Epitaxial Planar Silicon Transistor 2SA1857 FM, RF, MIX, IF Amplifier High-Frequency General-Purpose Amplifier Applications Features Package Dimensions � High power gain : PG=25dB typ (f=100MHz). unit:mm � High cutoff frequency : fT=750MHz typ. 2059A � Low collector-to-emitter saturation voltage. [2SA1857] � Complementary pair with the 2SC4400. 1 : Base

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BJT: SBT42 | 2SA200-Y | 2SA200-O | 2SD882-Q | 2SD882-P | 2SD882-E | 2SC945-L | 2SC945-H | 2SC4226-R23 | 2SC3357-F | 2SC3357-E | 2SC3356-R26 | 2SC3356-R24 | 2SC3356-R23 | 2SB772-Q | 2SB772-P | 2SB772-E | 2SA1015-L | 2SA1015-H | HSS8550 | HSS8050