# LM5071MT-80: 802.3af PoE PD Interface with DC/DC Controller LM5071MT-80 is a National Semiconductor / TI-heritage PoE powered-device controller combining an 802.3af interface with a current-mode DC/DC controller, up to ~12.95 W, in 16-TSSOP. It supports auxiliary adapter OR-ing and isolated or non-isolated topologies for IP phones, cameras, and industrial nodes. Follow IEEE inrush, classification, and isolation rules during layout. Bulk legacy NS lots need careful authenticity checks; prefer TI-branded successors when redesigning. Detailed parameters and stock for the [LM5071MT-80 National Semiconductor PoE PD + DC/DC controller, 16-TSSOP](https://chipapex.com/product/lm5071mt-80/) 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://md.nolog.cz/s/QjQbl16az) - [Related ChipApex note](https://telegra.ph/TI-LM2907MX-8NOPB-Compact-8-SOIC-Frequency-to-Voltage-Converter-10-22) - [Related ChipApex note](https://dev.to/chipapexsz/notes-on-the-infineon-111-3013-a-400-khz-buckboost-controller-in-8-soic-4bgm) - [Related ChipApex note](https://chipapexsz.wordpress.com/2026/10/22/microsemi-0910-60m-65-v-npn-rf-transistor-in-a-55aw-package/) - [Related ChipApex note](https://chipapex.hashnode.dev/a-60-v-sot-23-n-channel-as-a-low-side-switch-notes-on-the-06n06l) - [Related ChipApex note](https://rentry.co/chipapex-a2t27s007nt1) - [Related ChipApex note](https://text.is/chipapex-ph9400-111anlt) - [Related ChipApex note](https://ventiere.com/supplier/chipapex-1792389469075) - [Related ChipApex note](https://chipapex-distributor.surge.sh/) - [Related ChipApex note](https://md.picasoft.net/s/Nj-1HYj_GO)