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| Part Number | UC3843N | UC3845N | UC3844N | UC3841N | UC3842N | UC3843AN | UC3843BN | UC3843D | UC3843J |
|---|---|---|---|---|---|---|---|---|---|
| Manufacturer | Fairchild Semiconductor | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | STMicroelectronics | Fairchild Semiconductor | Unitrode |
| Product Status | Obsolete | Active | Active | Active | Active | Active | Active | Obsolete | Active |
| Output Type | Transistor Driver | Transistor Driver | Transistor Driver | Transistor Driver | Transistor Driver | Transistor Driver | Transistor Driver | Transistor Driver | Transistor Driver |
| Function | Step-Up, Step-Down, Step-Up/Step-Down | Step-Up, Step-Down, Step-Up/Step-Down | Step-Up, Step-Down, Step-Up/Step-Down | Step-Up, Step-Up/Step-Down | Step-Up, Step-Down, Step-Up/Step-Down | Step-Up, Step-Down, Step-Up/Step-Down | Step-Up, Step-Up/Step-Down | Step-Up, Step-Down, Step-Up/Step-Down | Step-Up, Step-Down, Step-Up/Step-Down |
| Output Configuration | Positive, Isolation Capable | Positive, Isolation Capable | Positive, Isolation Capable | Positive, Isolation Capable | Positive, Isolation Capable | Positive, Isolation Capable | Positive, Isolation Capable | Positive, Isolation Capable | Positive, Isolation Capable |
| Topology | Boost, Buck, Buck-Boost, Flyback, Forward | Boost, Buck, Buck-Boost, Flyback, Forward | Boost, Buck, Buck-Boost, Flyback, Forward | Boost, Flyback, Forward Converter | Boost, Buck, Buck-Boost, Flyback, Forward | Boost, Buck, Flyback, Forward | Boost, Flyback | Boost, Buck, Buck-Boost, Flyback, Forward | Boost, Buck, Buck-Boost, Flyback, Forward |
| Number of Outputs | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| Output Phases | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| Voltage - Supply (Vcc/Vdd) | 7.6V ~ 30V | 12V ~ 28V | 12V ~ 28V | 8V ~ 32V | 12V ~ 28V | 7.6V ~ 30V | 7.6V ~ 30V | 7.6V ~ 30V | 12V ~ 28V |
| Frequency - Switching | Up to 500kHz | Up to 500kHz | Up to 500kHz | 500kHz | Up to 500kHz | Up to 500kHz | Up to 500kHz | Up to 500kHz | Up to 500kHz |
| Duty Cycle (Max) | 97% | 48% | 48% | 95% | 97% | 96% | 96% | 97% | 97% |
| Synchronous Rectifier | No | No | No | No | No | No | No | No | No |
| Clock Sync | No | No | No | No | No | No | No | No | No |
| Serial Interfaces | - | - | - | - | - | - | - | - | - |
| Control Features | Frequency Control | Frequency Control | Frequency Control | Current Limit, Enable, Frequency Control, Ramp, Reset, Soft Start | Frequency Control | Frequency Control | Frequency Control | Frequency Control | Frequency Control |
| Operating Temperature | 0°C ~ 70°C (TA) | 0°C ~ 70°C (TA) | 0°C ~ 70°C (TA) | 0°C ~ 70°C (TA) | 0°C ~ 70°C (TA) | 0°C ~ 70°C (TA) | 0°C ~ 70°C (TJ) | 0°C ~ 70°C (TA) | 0°C ~ 70°C (TA) |
| Mounting Type | Through Hole | Through Hole | Through Hole | Through Hole | Through Hole | Through Hole | Through Hole | Surface Mount | Through Hole |
| Package / Case | 8-DIP (0.300", 7.62mm) | 8-DIP (0.300", 7.62mm) | 8-DIP (0.300", 7.62mm) | 18-DIP (0.300", 7.62mm) | 8-DIP (0.300", 7.62mm) | 8-DIP (0.300", 7.62mm) | 8-DIP (0.300", 7.62mm) | 14-SOIC (0.209", 5.30mm Width) | 8-CDIP (0.300", 7.62mm) |
| Supplier Device Package | 8-DIP | 8-PDIP | 8-PDIP | 18-PDIP | 8-PDIP | 8-PDIP | 8-Mini DIP | 14-SOP | 8-CDIP |
