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| Part Number | U643B-MFP | U643B-MFPG3 | U643B-M | U643B-MFPG3Y | U643B-MFPY |
| Manufacturer | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Series | - | - | - | - | - |
| Package/Case | 8-SOIC (0.154", 3.90mm Width) | 8-SOIC (0.154", 3.90mm Width) | 8-DIP (0.300", 7.62mm) | 8-SOIC (0.154", 3.90mm Width) | 8-SOIC (0.154", 3.90mm Width) |
| Packaging | Tube | Tape & Reel (TR) | Tube | Tape & Reel (TR) | Tube |
| Product Status | Obsolete | Obsolete | Obsolete | Obsolete | Obsolete |
| Type | Automotive, Flasher | Automotive, Flasher | Automotive, Flasher | Automotive, Flasher | Automotive, Flasher |
| Frequency | - | - | - | - | - |
| Voltage - Supply | 9V ~ 15V | 9V ~ 15V | 9V ~ 15V | 9V ~ 15V | 9V ~ 15V |
| Current - Supply | 7 mA | 7 mA | 7 mA | 7 mA | 7 mA |
| Current - Output Source/Sink | - | - | - | - | - |
| Dimming | No | No | No | No | No |
| Operating Temperature | -40°C ~ 95°C | -40°C ~ 95°C | -40°C ~ 95°C | -40°C ~ 95°C | -40°C ~ 95°C |
| Grade | - | - | - | - | - |
| Qualification | - | - | - | - | - |
| Mounting Type | Surface Mount | Surface Mount | Through Hole | Surface Mount | Surface Mount |
| Supplier Device Package | 8-SO | 8-SO | 8-DIP | 8-SO | 8-SOIC |
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