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| Part Number | FST3253QSCX | FST3257QSCX | FSTU3253QSCX | FST3253QSC | 
|---|---|---|---|---|
| Manufacturer | onsemi | Fairchild Semiconductor | Fairchild Semiconductor | onsemi | 
| Product Status | Obsolete | Obsolete | Active | Obsolete | 
| Type | Multiplexer/Demultiplexer | Multiplexer/Demultiplexer | Multiplexer/Demultiplexer | Multiplexer/Demultiplexer | 
| Circuit | 2 x 4:1 | 4 x 2:1 | 2 x 4:1 | 2 x 4:1 | 
| Independent Circuits | 1 | 1 | 1 | 1 | 
| Current - Output High, Low | - | - | - | - | 
| Voltage Supply Source | Single Supply | Single Supply | Single Supply | Single Supply | 
| Voltage - Supply | 4V ~ 5.5V | 3V ~ 5.5V | 4V ~ 5.5V | 4V ~ 5.5V | 
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C | -40°C ~ 85°C | -40°C ~ 85°C | 
| Mounting Type | Surface Mount | Surface Mount | Surface Mount | Surface Mount | 
| Package / Case | 16-LSSOP (0.154", 3.90mm Width) | 16-LSSOP (0.154", 3.90mm Width) | 16-LSSOP (0.154", 3.90mm Width) | 16-LSSOP (0.154", 3.90mm Width) | 
| Supplier Device Package | 16-QSOP | 16-QSOP | 16-QSOP | 16-QSOP |