The BST51,135 from Nexperia USA Inc. is an NPN Darlington bipolar (BJT) transistor rated 60 V and 1 A, with a 200 MHz transition frequency and 1.3 W power dissipation, in a surface-mount SOT-89 package.
The BST51TA from Diodes Incorporated is an NPN Darlington bipolar (BJT) transistor rated 60 V and 500 mA, with 1 W power dissipation, in a surface-mount SOT-89-3 package.