2SA1521 Bipolar Transistor

• Type: PNP
• Collector-Emitter Voltage, max: -50 V
• Collector-Base Voltage, max: -50 V
• Emitter-Base Voltage, max: -6 V
• Collector Current − Continuous, max: -0.5 A
• Collector Dissipation: 0.2 W
• DC Current Gain (h_fe): 50
• Transition Frequency, min: 200 MHz
• Operating and Storage Junction Temperature Range: -55 to +150 °C
• Package: SOT-23

Here is an image showing the pin diagram of this transistor.The 2SA1521 transistor is marked as "OL".The complementary NPN transistor to the 2SA1521 is the 2SC3915.You can replace the 2SA1521 with the 2SA1313, 2SA1313-O, 2SA1313-Y, 2SA1518, 2SA1519, 2SA1520, 2SB710A, 2SB710A-Q, 2SB710A-R, 2SB710A-S, 2STR2160, BCW89, FMMT2907A, FMMT2907AR, FMMT551, FMMT591, FMMT591Q, FMMTA55, FMMTA56, KN2907AS, KST2907A, KST55, KST56, KTN2907AS, MMBT2907A, MMBT4354, MMBT4355, MMBT4356, MMBTA55, MMBTA56, PMBT2907A, PMBTA56, PMST2907A, SMBTA55 or SMBTA56.