| 1221521 | MUA08A | 265mW at 3.3V Supply Audio Power Amplifier with Shutdown Mode | National Semiconductor |
| 1221522 | MUA08A | 1W, Bypass-Capacitor-less Audio Amplifier with Internal Selectable Gain | National Semiconductor |
| 1221523 | MUAD16K136-10B272C | 100MHz 1M and 2M ternary CAM | MUSIC Semiconductors |
| 1221524 | MUAD16K136-66B272C | 66MHz 1M and 2M ternary CAM | MUSIC Semiconductors |
| 1221525 | MUAD16K136-83B272C | 83MHz 1M and 2M ternary CAM | MUSIC Semiconductors |
| 1221526 | MUAD8K136-10B272C | 100MHz 1M ternary CAM | MUSIC Semiconductors |
| 1221527 | MUAD8K136-66B272C | 66MHz 1M ternary CAM | MUSIC Semiconductors |
| 1221528 | MUAD8K136-83B272C | 83MHz 1M ternary CAM | MUSIC Semiconductors |
| 1221529 | MUB08A | 1W, Bypass-Capacitor-less Audio Amplifier with Internal Selectable Gain | National Semiconductor |
| 1221530 | MUB31DH | LED LAMPS | Micro Electronics |
| 1221531 | MUB32DH | LOW CURRENT HIGH EFFICIENCY LED LAMPS | Micro Electronics |
| 1221532 | MUB32DH-5 | LOW CURRENT HIGH EFFICIENCY RED LED LAMP | Micro Electronics |
| 1221533 | MUB51DH | LED LAMPS | Micro Electronics |
| 1221534 | MUB81DH | LED LAMPS | Micro Electronics |
| 1221535 | MUBW10-06A6 | Converter - Brake - Inverter Module (CBI1) | IXYS Corporation |
| 1221536 | MUBW10-06A7 | Converter - Brake - Inverter Module | IXYS Corporation |
| 1221537 | MUBW10-12 | Converter - Brake - Inverter Module (CBI2) | IXYS Corporation |
| 1221538 | MUBW10-12A6 | Converter - Brake - Inverter Module (CBI1) | IXYS Corporation |
| 1221539 | MUBW10-12A7 | Converter - Brake - Inverter Module (CBI2) | IXYS Corporation |
|
| 1221540 | MUBW100-06A8 | 1600V converter-brake-inverter module | IXYS |
| 1221541 | MUBW15-06A6 | Converter - Brake - Inverter Module (CBI1) | IXYS Corporation |
| 1221542 | MUBW15-12A6 | Converter - Brake - Inverter Module (CBI1) | IXYS Corporation |
| 1221543 | MUBW15-12A7 | Converter - Brake - Inverter Module | IXYS Corporation |
| 1221544 | MUBW20-06A6 | Converter - Brake - Inverter Module (CBI1) | IXYS Corporation |
| 1221545 | MUBW20-06A6K | Converter - Brake - Inverter Module | IXYS Corporation |
| 1221546 | MUBW25-12A7 | Converter - Brake - Inverter Module | IXYS Corporation |
| 1221547 | MUBW30-12A6 | Converter - Brake - Inverter Module | IXYS Corporation |
| 1221548 | MUBW35-06A6K | Converter - Brake - Inverter Module | IXYS Corporation |
| 1221549 | MUBW35-12A7 | Converter - Brake - Inverter Module (CBI2) | IXYS Corporation |
| 1221550 | MUBW50-06A8 | Converter - Brake - Inverter Module (CBI3) | IXYS Corporation |
| 1221551 | MUBW75-06A8 | Converter - Brake - Inverter Module (CBI3) | IXYS Corporation |
| 1221552 | MULLARD-PACKAGES | Construction and Dimensions | Mullard |
| 1221553 | Multi-User Operating System Diplexer | Multi-User Operating System Diplexer | Skyworks Solutions |
| 1221554 | MULTIWATT | MULTIWATT | ST Microelectronics |
| 1221555 | MULTIWATT11 | MULTIWATT | ST Microelectronics |
| 1221556 | MULTIWATT15 | MULTIWATT | ST Microelectronics |
| 1221557 | MULTIWATT8 | MULTIWATT | ST Microelectronics |
| 1221558 | MUN211 | Bias Resistor Transistor | ON Semiconductor |
| 1221559 | MUN2111 | Bias Resistor Transistor | ON Semiconductor |
| 1221560 | MUN2111RT1 | Bias Resistor Transistor | Leshan Radio Company |
