BC558 The BC558 is the PNP version of the BC548, and has higher voltage versions: BC556 and BC557, and lower noise versions: BC559 and BC560. SMD versions of the BC546 to BC560 The surface-mount package versions are the BC846 to BC850 (and PNP versions: BC856 to BC860). See also 2N2222, 2N2907 2N3904, 2N3906 2N3055 BC108 KT315 References Further reading Historical Databooks Small-Signal Transistor Data Book, 1386 pages, 1984, Motorola. Transistor and Diode Data Book, 1236 pages, 1973, Texas Instruments. Miniwatt Digest, Miniwatt Digest, vol 7, no 2, 1968, Miniwatt/PHILIPS Electrical Commercial transistors Bipolar transistors