The ON Semiconductor 2SB561CTZ-E is a small-signal PNP bipolar transistor designed for general-purpose amplification and switching in low-current analog and digital circuits. As a small-signal device, it handles collector currents in the milliamp range rather than the ampere-level currents of a power transistor — suited for preamp stages, driver circuits, and logic-level interface loads where a PNP polarity is needed. The 'Bulk' packaging means these ship as loose parts, not taped for automated pick-and-place, so plan for hand-loading or tube feeding on the assembly line.
Lifecycle and compliance — still in production, RoHS3 clean
No last-time-buy risk for ongoing builds. It is also ROHS3 Compliant, meeting the strictest EU restriction levels for lead and other substances, so it passes straight into RoHS-required BOMs without an exemption waiver.