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| Part Number | FSQ321L | FSQ321LX | FSQ311L | FSQ321 |
|---|---|---|---|---|
| Manufacturer | Fairchild Semiconductor | onsemi | Fairchild Semiconductor | onsemi |
| Product Status | Active | Active | Obsolete | Obsolete |
| Output Isolation | Isolated | Isolated | Isolated | Isolated |
| Internal Switch(s) | Yes | Yes | Yes | Yes |
| Voltage - Breakdown | 650V | 650V | 650V | 650V |
| Topology | Flyback | Flyback | Flyback | Flyback |
| Voltage - Start Up | 12 V | 12 V | 12 V | 12 V |
| Voltage - Supply (Vcc/Vdd) | 8V ~ 20V | 8V ~ 20V | 8V ~ 20V | 8V ~ 20V |
| Duty Cycle | - | - | - | - |
| Frequency - Switching | 55kHz ~ 67kHz | 55kHz ~ 67kHz | - | 55kHz ~ 67kHz |
| Power (Watts) | 12 W | 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 | Current Limiting, Over Load, Over Temperature, Over Voltage |
| Control Features | Sync | Sync | Sync | Sync |
| Operating Temperature | -40°C ~ 85°C (TA) | -40°C ~ 85°C (TA) | -40°C ~ 85°C (TA) | -40°C ~ 85°C (TA) |
| Package / Case | 8-SMD, Gull Wing | 8-SMD, Gull Wing | 8-SMD, Gull Wing | 8-DIP (0.300", 7.62mm) |
| Supplier Device Package | 8-LSOP | 8-LSOP | 8-LSOP | 8-DIP |
| Mounting Type | Surface Mount | Surface Mount | Surface Mount | Through Hole |
