2SC2578 Bipolar Transistor

• Type: NPN
• Collector-Emitter Voltage, max: 100 V
• Collector-Base Voltage, max: 140 V
• Emitter-Base Voltage, max: 6 V
• Collector Current − Continuous, max: 7 A
• Collector Dissipation: 70 W
• DC Current Gain (h_fe): 50
• Transition Frequency, min: 20 MHz
• Operating and Storage Junction Temperature Range: -55 to +150 °C
• Package: TO-3P

Here is an image showing the pin diagram of this transistor.Sometimes the "2S" prefix is not marked on the package - the 2SC2578 might only be marked "C2578".The complementary PNP transistor to the 2SC2578 is the 2SA1103.You can replace the 2SC2578 with the 2SC2563, 2SC2563-O, 2SC2563-R, 2SC2563-Y, 2SC2579, 2SC2580, 2SC2581, 2SC2706, 2SC2706-O, 2SC2706-R, 2SC2706-Y, 2SC2837, 2SC2837-O, 2SC2837-P, 2SC2837-Y, 2SC3181, 2SC3181-O, 2SC3181-R, 2SC3181N, 2SC3181N-O, 2SC3181N-R, 2SC3182, 2SC3182-O, 2SC3182-R, 2SC3280, 2SC3280O, 2SC3280R, 2SC3281, 2SC3281O, 2SC3281R, 2SC3284, 2SC3284-O, 2SC3284-P, 2SC3284-Y, 2SC3519, 2SC3519-O, 2SC3519-P, 2SC3519-Y, 2SC3519A, 2SC3519A-O, 2SC3519A-P, 2SC3519A-Y, 2SC3835, 2SC3854, 2SC3854-O, 2SC3854-P, 2SC3854-Y, 2SC3855, 2SC3855-O, 2SC3855-P, 2SC3855-Y, 2SC3856, 2SC3856-O, 2SC3856-P, 2SC3856-Y, 2SC3907, 2SC3907-O, 2SC3907-R, 2SC4278, 2SC4278-D, 2SC4278-E, 2SC4278-F, 2SC4467, 2SC4467-O, 2SC4467-P, 2SC4467-Y, 2SC4468, 2SC4468-O, 2SC4468-P, 2SC4468-Y, 2SC4652, 2SC4652-D, 2SC4652-E, 2SC4652-F, 2SC4689, 2SC4689-O, 2SC4689-R, 2SC4690, 2SC4690-O, 2SC4690-R, 2SC5197, 2SC5197O, 2SC5197R, 2SC5198, 2SC5198O, 2SC5198R, 2SC5199, 2SC5199O, 2SC5199R, 2SC5774, 2SC5775, 2SC5948, 2SC5948-O, 2SC5948-R, 2SC5949, 2SC5949-O, 2SC5949-R, 2SC6011, 2SC6011-O, 2SC6011-P, 2SC6011-Y, 2SD1046, 2SD1046-D, 2SD1046-E, 2SD1047, 2SD1047-D, 2SD1047-E, 2SD1047C, 2SD1148, 2SD1148-O, 2SD1148-R, 2SD1197, 2SD1288, 2SD1288-P, 2SD1288-Q, 2SD1288-R, 2SD1289, 2SD1289-P, 2SD1289-Q, 2SD1289-R, 2SD1717, 2SD1717-P, 2SD1717-Q, 2SD1717-S, 2SD1718, 2SD1718-P, 2SD1718-Q, 2SD1718-S, 2SD1840, 2SD1840-P, 2SD1840-Q, 2SD1841, 2SD1841-P, 2SD1841-Q, 2SD1842, 2SD1842-P, 2SD1842-Q, 2SD2052, 2SD2052-P, 2SD2052-Q, 2SD2052-S, 2SD2053, 2SD2053-P, 2SD2053-Q, 2SD2155, 2SD2155-O, 2SD2155-R, 2SD2384, 2SD2384-A, 2SD2384-B, 2SD2384-C, 2SD2385, 2SD2385-A, 2SD2385-B, 2SD2385-C, 2SD2386, 2SD2386-A, 2SD2386-B, 2SD2386-C, 2SD2387, 2SD2387-A, 2SD2387-B, 2SD2387-C, 2SD2389, 2SD2389-O, 2SD2389-P, 2SD2389-Y, 2SD2390, 2SD2390-O, 2SD2390-P, 2SD2390-Y, 2SD712, 2SD712O, 2SD712R, 2SD998, 2SD998-O, 2SD998-R, BDV65B, BDV65BG, BDV67B, BDV67C, BDV67D, BDW83C, BDW83D, FJA4310, FJA4310O, FJA4310R, FJA4310Y, KTD1047, KTD1047-O, KTD1047-Y, KTD1047B, KTD1047B-O, KTD1047B-Y, KTD718, KTD718-O, KTD718-R, KTD718B, KTD718B-O, KTD718B-R, KTD998, KTD998-O, KTD998-R, MJH11018, MJH11018G, MJH11020, MJH11020G, MJH6284, MJH6284G, NTE2328, TIP142, TIP142G, TTC0001 or TTC0002.