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(31) Current sinking NPN open collector Transistor, Single channel, 250 mA max.

(32) Especially, the circuit of NAND gate my be totally made by NPN transistor, and the circuit structure is simple, easily is complicated by Integrate Circuit.

(33) NPN transistor for high current switching applications, interface circuit and driver circuit applications. With built-in bias resistors (1 and 10 kOm).