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| Part Number | FSQ321 | FSQ321L | FSQ311 | 
|---|---|---|---|
| Manufacturer | onsemi | Fairchild Semiconductor | Fairchild Semiconductor | 
| Product Status | Obsolete | Active | Obsolete | 
| Output Isolation | Isolated | Isolated | Isolated | 
| Internal Switch(s) | Yes | Yes | Yes | 
| Voltage - Breakdown | 650V | 650V | 650V | 
| Topology | Flyback | Flyback | Flyback | 
| Voltage - Start Up | 12 V | 12 V | 12 V | 
| Voltage - Supply (Vcc/Vdd) | 8V ~ 20V | 8V ~ 20V | 8V ~ 20V | 
| Duty Cycle | - | - | - | 
| Frequency - Switching | 55kHz ~ 67kHz | 55kHz ~ 67kHz | - | 
| Power (Watts) | 12 W | 12 W | 12 W | 
| Fault Protection | Current Limiting, Over Load, Over Temperature, Over Voltage | Current Limiting, Over Load, Over Temperature, Over Voltage | Current Limiting, Over Load, Over Temperature, Over Voltage | 
| Control Features | Sync | Sync | Sync | 
| Operating Temperature | -40°C ~ 85°C (TA) | -40°C ~ 85°C (TA) | -40°C ~ 85°C (TA) | 
| Package / Case | 8-DIP (0.300", 7.62mm) | 8-SMD, Gull Wing | 8-DIP (0.300", 7.62mm) | 
| Supplier Device Package | 8-DIP | 8-LSOP | 8-DIP | 
| Mounting Type | Through Hole | Surface Mount | Through Hole |