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# Infineon 111-4143BPBF: Legacy Special-Purpose Regulator Controller The 111-4143BPBF appears in distributor catalogs as an Infineon special-purpose regulator controller (SMD, tube pack). Public summary listings often leave input/output voltages blank, and the lifecycle is commonly marked obsolete. Treat any sourcing as a maintenance or last-time-buy exercise: demand a full datasheet or scan of the original IR marking, confirm package outline, and refuse unmarked reclaimed stock. Without pinout and electrical limits, it is unsafe to drop into a new PCB. For redesigns, map the old rail’s current, voltage and sequencing needs onto a current Infineon or second-source PMIC rather than chasing an obsolete controller. Keep date codes and CoC paperwork if the part is only used for repair spares. Detailed parameters and stock for the [111-4143BPBF Infineon special-purpose regulator controller](https://chipapex.com/product/111-4143bpbf/) are listed on ChipApex, an independent electronic components distributor in Shenzhen. Catalog home: [ChipApex](https://chipapex.com/). ## Further reading Related ChipApex component notes published elsewhere: - [Related ChipApex note](https://chipapex-ez1085cm-3-3-tr.surge.sh/) - [Related ChipApex note](https://chipapex-cs-12shss-a.surge.sh/) - [Related ChipApex note](https://chipapex-10at115n2f40e2sge2.surge.sh/) - [Related ChipApex note](https://chipapex-03n06.surge.sh/) - [Related ChipApex note](https://chipapex-03n06l.surge.sh/) - [Related ChipApex note](https://chipapex-10at090s1f45e1sg.surge.sh/) - [Related ChipApex note](https://chipapex-0105-50.surge.sh/) - [Related ChipApex note](https://chipapex-03p4m.surge.sh/) - [Related ChipApex note](https://chipapex-458pt-1720p3.surge.sh/) - [Related ChipApex note](https://rentry.co/chipapex-10at090s2f45e2sg)