BD241 Bipolar Transistor

• Type: NPN
• Collector-Emitter Voltage, max: 45 V
• Collector-Base Voltage, max: 55 V
• Emitter-Base Voltage, max: 5 V
• Collector Current − Continuous, max: 3 A
• Collector Dissipation: 40 W
• DC Current Gain (h_fe): 25
• Operating and Storage Junction Temperature Range: -65 to +150 °C
• Package: TO-220

Here is an image showing the pin diagram of this transistor.The complementary PNP transistor to the BD241 is the BD242.The 2SD1623 (SOT-89), 2SD1623-R (SOT-89), 2SD1623-S (SOT-89), 2SD1623-T (SOT-89), 2SD1623-U (SOT-89), 2SD1624 (SOT-89), 2SD1624-R (SOT-89), 2SD1624-S (SOT-89), 2SD1624-T (SOT-89) and 2SD1624-U (SOT-89) is the SMD version of the BD241 transistor. These transistors are of the same type, have similar parameters and are designed for surface mounting.You can replace the BD241 with the 2N5293, 2N5294, 2N6043, 2N6043G, 2N6044, 2N6044G, 2N6121, 2N6122, 2N6123, 2N6290, 2N6290G, 2N6291, 2N6292, 2N6292G, 2N6293, 2N6387, 2N6387G, 2N6388, 2N6388G, 2N6530, 2SC1061, 2SC1061-A, 2SC1061-B, 2SC1061-C, 2SC1061-D, 2SC1826, 2SC1827, 2SC1985, 2SC1986, 2SC2075, 2SC2078, 2SC2078B, 2SC2078C, 2SC2078D, 2SC2078E, 2SC2233, 2SC2315, 2SC2316, 2SC2562, 2SC2562O, 2SC2562Y, 2SC3144, 2SC3145, 2SC3179, 2SC3239, 2SC3239-O, 2SC3239-Y, 2SC3252, 2SC3252-Q, 2SC3252-R, 2SC3252-S, 2SC3253, 2SC3253-Q, 2SC3253-R, 2SC3253-S, 2SC3254, 2SC3254-Q, 2SC3254-R, 2SC3254-S, 2SC3255, 2SC3255-Q, 2SC3255-R, 2SC3255-S, 2SC3258, 2SC3258-O, 2SC3258-Y, 2SC3299, 2SC3299-O, 2SC3299-Y, 2SC3308, 2SC3308-O, 2SC3308-Y, 2SC3345, 2SC3345-O, 2SC3345-Y, 2SC3346, 2SC3346-O, 2SC3346-Y, 2SC3540, 2SC3540-O, 2SC3540-Y, 2SC3709, 2SC3709-O, 2SC3709-Y, 2SC3709A, 2SC3709A-O, 2SC3709A-Y, 2SC3710, 2SC3710-O, 2SC3710-Y, 2SC3710A, 2SC3710A-O, 2SC3710A-Y, 2SC3746, 2SC3746-Q, 2SC3746-R, 2SC3746-S, 2SC3747, 2SC3747-Q, 2SC3747-R, 2SC3747-S, 2SC3748, 2SC3748-Q, 2SC3748-R, 2SC3748-S, 2SC3851, 2SC3851A, 2SC3852, 2SC3852A, 2SC4007, 2SC4007-E, 2SC4007-F, 2SC4007-G, 2SC4008, 2SC4008-E, 2SC4008-F, 2SC4008-G, 2SC4495, 2SC4511, 2SC4511-O, 2SC4511-P, 2SC4511-Y, 2SC4512, 2SC4512-O, 2SC4512-P, 2SC4512-Y, 2SC4550, 2SC4550-K, 2SC4550-L, 2SC4550-M, 2SC4551, 2SC4551-K, 2SC4551-L, 2SC4551-M, 2SC4552, 2SC4552-K, 2SC4552-L, 2SC4552-M, 2SC4881, 2SC4935, 2SC4935O, 2SC4935Y, 2SC789, 2SC789-O, 2SC789-R, 2SC789-Y, 2SD1060, 2SD1060-Q, 2SD1060-R, 2SD1060-S, 2SD1061, 2SD1061-Q, 2SD1061-R, 2SD1061-S, 2SD1062, 2SD1062-Q, 2SD1062-R, 2SD1062-S, 2SD1133, 2SD1133-B, 2SD1133-C, 2SD1133-D, 2SD1134, 2SD1134-B, 2SD1134-C, 2SD1134-D, 2SD1158, 2SD1190, 2SD1191, 2SD1192, 2SD1265, 2SD1265-O, 2SD1265-P, 2SD1265-Q, 2SD1265A, 2SD1265A-O, 2SD1265A-P, 2SD1265A-Q, 2SD1266, 2SD1266-O, 2SD1266-P, 2SD1266-Q, 2SD1266A, 2SD1266A-O, 2SD1266A-P, 2SD1266A-Q, 2SD1267, 2SD1267-P, 2SD1267-Q, 2SD1267-R, 2SD1267A, 2SD1267A-P, 2SD1267A-Q, 2SD1267A-R, 2SD1268, 2SD1268-P, 2SD1268-Q, 2SD1268-R, 2SD1269, 2SD1269-P, 2SD1269-Q, 2SD1269-R, 2SD1270, 2SD1270-P, 2SD1270-Q, 2SD1270-R, 2SD1271, 2SD1271-P, 2SD1271-Q, 2SD1271-R, 2SD1273, 2SD1273A, 2SD1273AO, 2SD1273AP, 2SD1273AQ, 2SD1273O, 2SD1273P, 2SD1273Q, 2SD1276, 2SD1276-P, 2SD1276-Q, 2SD1276A, 2SD1276A-P, 2SD1276A-Q, 2SD1277, 2SD1277-P, 2SD1277-Q, 2SD1277A, 2SD1277A-P, 2SD1277A-Q, 2SD1354, 2SD1354-GR, 2SD1354-O, 2SD1354-Y, 2SD1356, 2SD1356-O, 2SD1356-R, 2SD1356-Y, 2SD1362, 2SD1362-O, 2SD1362-Y, 2SD1363, 2SD1363-O, 2SD1363-Y, 2SD1406, 2SD1406-G, 2SD1406-O, 2SD1406-Y, 2SD1408, 2SD1408-O, 2SD1408-R, 2SD1408-Y, 2SD1411, 2SD1411-O, 2SD1411-Y, 2SD1411A, 2SD1411A-O, 2SD1411A-Y, 2SD1412, 2SD1412-O, 2SD1412-Y, 2SD1414, 2SD1568, 2SD1568-K, 2SD1568-L, 2SD1568-M, 2SD1588, 2SD1588-K, 2SD1588-L, 2SD1588-M, 2SD1666, 2SD1666-Q, 2SD1666-R, 2SD1666-S, 2SD1667, 2SD1667-Q, 2SD1667-R, 2SD1667-S, 2SD1668, 2SD1668-Q, 2SD1668-R, 2SD1668-S, 2SD1669, 2SD1669-Q, 2SD1669-R, 2SD1669-S, 2SD1761, 2SD1761-D, 2SD1761-E, 2SD1761-F, 2SD1762, 2SD1762D, 2SD1762E, 2SD1762F, 2SD1825, 2SD1826, 2SD1827, 2SD1890, 2SD1890-P, 2SD1890-Q, 2SD1891, 2SD1891-P, 2SD1891-Q, 2SD1913, 2SD1913Q, 2SD1913R, 2SD1913S, 2SD2012, 2SD2058, 2SD2058-O, 2SD2058-Y, 2SD2060, 2SD2060-O, 2SD2060-R, 2SD2060-Y, 2SD2061, 2SD2061E, 2SD2061F, 2SD234, 2SD234O, 2SD234R, 2SD234Y, 2SD2374, 2SD2374-P, 2SD2374-Q, 2SD2374A, 2SD2374A-P, 2SD2374A-Q, 2SD2375, 2SD2375-P, 2SD2375-Q, 2SD2394, 2SD2394-E, 2SD2394-F, 2SD2395, 2SD2395-E, 2SD2395-F, 2SD2396, 2SD2396-H, 2SD2396-J, 2SD2396-K, 2SD288, 2SD288-O, 2SD288-R, 2SD288-Y, 2SD313, 2SD313C, 2SD313D, 2SD313E, 2SD313F, 2SD362-O, 2SD362-R, 2SD389, 2SD389-O, 2SD389-P, 2SD389-Q, 2SD389A, 2SD389A-O, 2SD389A-P, 2SD389A-Q, 2SD476, 2SD476-B, 2SD476-C, 2SD476A, 2SD476A-B, 2SD476A-C, 2SD526, 2SD526-O, 2SD526-R, 2SD526-Y, 2SD553, 2SD553-O, 2SD553-Y, 2SD568, 2SD568-K, 2SD568-L, 2SD568-M, 2SD569, 2SD569-K, 2SD569-L, 2SD569-M, 2SD613, 2SD613-C, 2SD613-D, 2SD613-E, 2SD613-F, 2SD634, 2SD635, 2SD743, 2SD743-Q, 2SD743-R, 2SD743-S, 2SD812, 2SD812-P, 2SD812-Q, 2SD812-R, 2SD837, 2SD837-P, 2SD837-Q, 2SD837-R, 2SD837A, 2SD837A-P, 2SD837A-Q, 2SD837A-R, 2SD856, 2SD856-P, 2SD856-Q, 2SD856-R, 2SD856A, 2SD856A-P, 2SD856A-Q, 2SD856A-R, 2SD857, 2SD857-P, 2SD857-Q, 2SD857-R, 2SD857A, 2SD857A-P, 2SD857A-Q, 2SD857A-R, 2SD866, 2SD866-P, 2SD866-Q, 2SD866-R, 2SD880, 2SD880GR, 2SD880O, 2SD880Y, BD201, BD203, BD241A, BD241B, BD243, BD243A, BD243B, BD301, BD303, BD533, BD533J, BD533K, BD535, BD535J, BD535K, BD537, BD537J, BD537K, BD539A, BD539B, BD543A, BD543B, BD545A, BD545B, BD643, BD645, BD647, BD737, BD795, BD797, BD799, BD807, BD809, BD895, BD895A, BD897, BD897A, BD899, BD899A, BD933, BD933F, BD935, BD935F, BD937, BD937F, BD947, BD949, BD951, BDT61, BDT61A, BDT63, BDT63A, BDT65, BDT65A, BDT81, BDT81F, BDT83, BDT83F, BDW23, BDW23A, BDW23B, BDW39, BDW40, BDW41, BDW41G, BDW53, BDW53A, BDW53B, BDW63, BDW63A, BDW63B, BDW73, BDW73A, BDW73B, BDW93, BDW93A, BDW93B, BDX33, BDX33A, BDX33B, BDX33BG, BDX53, BDX53A, BDX53B, BDX53BG, BDX77, D44H11, D44H11FP, D44H8, KSD1273, KSD1273O, KSD1273P, KSD1273Q, KSD1406, KSD1406-G, KSD1406-O, KSD1406-Y, KSD1408, KSD1408-O, KSD1408-R, KSD1408-Y, KSD1588, KSD1588-O, KSD1588-R, KSD1588-Y, KSD2012, KSD2012-G, KSD2012-Y, KSD2058, KSD2058-G, KSD2058-O, KSD2058-Y, KSD288, KSD288-O, KSD288-R, KSD288-Y, KSD362-O, KSD362-R, KSD526, KSD526-O, KSD526-R, KSD526-Y, KSD568, KSD568-O, KSD568-R, KSD568-Y, KSD569, KSD569-O, KSD569-R, KSD569-Y, KSD880, KSD880-G, KSD880-O, KSD880-Y, KTC1003, KTC2016, KTC2016-GR, KTC2016-Y, KTC2026, KTC2026-GR, KTC2026-Y, KTC2026GR, KTC2026Y, KTC2027, KTC2027-O, KTC2027-Y, KTD1351, KTD1351GR, KTD1351O, KTD1351Y, KTD2058, KTD2058O, KTD2058Y, KTD2060, KTD2060O, KTD2060R, KTD2060Y, MJE2801T, MJE800T, MJE801T, MJE802T, MJE803T, NTE152, NTE196, TIP100, TIP100G, TIP101, TIP101G, TIP120, TIP120G, TIP121, TIP121G, TIP130, TIP130G, TIP131, TIP131G, TIP140T, TIP141T or TTC3710B.