| 53 | SOT-523F | MM5Z3V3 | Fairchild | Zener diode |  |
| 53 | SOD-523 | ZV953V2TA | Zetex (Now Diodes) | Varactor Diode |  |
| 53** | SOT-363 | STN6303 | Stanson | N-Channel MOSFETs |  |
| 5316 | TQFN-20 3x3 | G5316RZ1D | GMT | PWM controller |  |
| 5316 | TQFN-20 3x3 | G5316RZ1U | GMT | PWM controller |  |
| 5343 | SOT-23 | 2SC5343 | BL Galaxy Electrical | NPN transistor |  |
| 5345 | SOT-23 | 2SC5345 | BL Galaxy Electrical | NPN transistor |  |
| 5350 | MLP-6 3x3 | FAN5350MPX | Fairchild | Step-Down Converter |  |
| 53AC | DFN-10 3x3 | ISL61853ACRZ | Intersil | USB Port Power Supply Controller |  |
| 53AI | DFN-10 3x3 | ISL61853AIRZ | Intersil | USB Port Power Supply Controller |  |
| 53BC | DFN-10 3x3 | ISL61853BCRZ | Intersil | USB Port Power Supply Controller |  |
| 53BI | DFN-10 3x3 | ISL61853BIRZ | Intersil | USB Port Power Supply Controller |  |
| 53CC | DFN-10 3x3 | ISL61853CCRZ | Intersil | USB Port Power Supply Controller |  |
| 53CI | DFN-10 3x3 | ISL61853CIRZ | Intersil | USB Port Power Supply Controller |  |
| 53DC | DFN-10 3x3 | ISL61853DCRZ | Intersil | USB Port Power Supply Controller |  |
| 53DI | DFN-10 3x3 | ISL61853DIRZ | Intersil | USB Port Power Supply Controller |  |
| 53EC | DFN-10 3x3 | ISL61853ECRZ | Intersil | USB Port Power Supply Controller |  |
| 53EI | DFN-10 3x3 | ISL61853EIRZ | Intersil | USB Port Power Supply Controller |  |
| 53FC | DFN-10 3x3 | ISL61853FCRZ | Intersil | USB Port Power Supply Controller |  |
| 53FI | DFN-10 3x3 | ISL61853FIRZ | Intersil | USB Port Power Supply Controller |  |
| 53GC | DFN-10 3x3 | ISL61853GCRZ | Intersil | USB Port Power Supply Controller |  |
| 53GI | DFN-10 3x3 | ISL61853GIRZ | Intersil | USB Port Power Supply Controller |  |
| 53HC | DFN-10 3x3 | ISL61853HCRZ | Intersil | USB Port Power Supply Controller |  |
| 53HI | DFN-10 3x3 | ISL61853HIRZ | Intersil | USB Port Power Supply Controller |  |
| 53IC | DFN-10 3x3 | ISL61853ICRZ | Intersil | USB Port Power Supply Controller |  |
| 53II | DFN-10 3x3 | ISL61853IIRZ | Intersil | USB Port Power Supply Controller |  |
| 53JC | DFN-10 3x3 | ISL61853JCRZ | Intersil | USB Port Power Supply Controller |  |
| 53JI | DFN-10 3x3 | ISL61853JIRZ | Intersil | USB Port Power Supply Controller |  |
| 53KC | DFN-10 3x3 | ISL61853KCRZ | Intersil | USB Port Power Supply Controller |  |
| 53KI | DFN-10 3x3 | ISL61853KIRZ | Intersil | USB Port Power Supply Controller |  |
| 53LC | DFN-10 3x3 | ISL61853LCRZ | Intersil | USB Port Power Supply Controller |  |
| 53LI | DFN-10 3x3 | ISL61853LIRZ | Intersil | USB Port Power Supply Controller |  |
| 53MC | DFN-10 3x3 | ISL61853MCRZ | Intersil | USB Port Power Supply Controller |  |
| 53MI | DFN-10 3x3 | ISL61853MIRZ | Intersil | USB Port Power Supply Controller |  |
| 53NC | DFN-10 3x3 | ISL61853NCRZ | Intersil | USB Port Power Supply Controller |  |
| 53NI | DFN-10 3x3 | ISL61853NIRZ | Intersil | USB Port Power Supply Controller |  |
| 53OC | DFN-10 3x3 | ISL61853OCRZ | Intersil | USB Port Power Supply Controller |  |
| 53OI | DFN-10 3x3 | ISL61853OIRZ | Intersil | USB Port Power Supply Controller |  |
| 53PC | DFN-10 3x3 | ISL61853PCRZ | Intersil | USB Port Power Supply Controller |  |
| 53PI | DFN-10 3x3 | ISL61853PIRZ | Intersil | USB Port Power Supply Controller |  |
| 53s | SOT-23 | BAT17 | Infineon | Schottky diode |  |