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| Part Number | UC3845N | UC3846N | UC3847N | UC3845NG | UC3843N | UC3844N | UC3845AN | UC3845BN | UC3845D | UC3845J |
|---|---|---|---|---|---|---|---|---|---|---|
| Manufacturer | Texas Instruments | Texas Instruments | Texas Instruments | onsemi | Fairchild Semiconductor | Texas Instruments | Texas Instruments | STMicroelectronics | Fairchild Semiconductor | Unitrode |
| Product Status | Active | Active | Obsolete | Obsolete | Obsolete | 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 | Transistor Driver |
| Function | Step-Up, Step-Down, Step-Up/Step-Down | Step-Up, Step-Up/Step-Down | Step-Up, 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-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 | Positive | Positive, Isolation Capable | Positive, Isolation Capable | Positive, Isolation Capable | Positive, Isolation Capable | Positive, Isolation Capable | Positive or Negative, Isolation Capable | Positive |
| Topology | Boost, Buck, Buck-Boost, Flyback, Forward | Boost, Flyback, Forward Converter, Half-Bridge, Push-Pull | Boost, Flyback, Forward Converter, Half-Bridge, Push-Pull | Boost, Flyback | Boost, Buck, Buck-Boost, Flyback, Forward | Boost, Buck, Buck-Boost, Flyback, Forward | Boost, Buck, Flyback, Forward | Boost, Flyback | Boost, Buck, Buck-Boost, Flyback, Forward | - |
| Number of Outputs | 1 | 2 | 2 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| Output Phases | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| Voltage - Supply (Vcc/Vdd) | 12V ~ 28V | 6.95V ~ 40V | 6.95V ~ 40V | 7.6V ~ 30V | 7.6V ~ 30V | 12V ~ 28V | 7.6V ~ 30V | 7.6V ~ 30V | 7.6V ~ 30V | 12V ~ 28V |
| Frequency - Switching | Up to 500kHz | 500kHz | 500kHz | Up to 500kHz | Up to 500kHz | Up to 500kHz | Up to 500kHz | Up to 500kHz | Up to 500kHz | 100kHz |
| Duty Cycle (Max) | 48% | 50% | 50% | 48% | 97% | 48% | 48% | 48% | 48% | 48% |
| Synchronous Rectifier | No | Yes | Yes | No | No | No | No | No | No | No |
| Clock Sync | No | Yes | Yes | No | No | No | No | No | No | No |
| Serial Interfaces | - | - | - | - | - | - | - | - | - | - |
| Control Features | Frequency Control | Current Limit, Enable, Frequency Control, Soft Start | Current Limit, Enable, Frequency Control, Soft Start | Frequency Control | Frequency Control | 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 (TA) | -40°C ~ 150°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 | Through Hole | Surface Mount | Through Hole |
| Package / Case | 8-DIP (0.300", 7.62mm) | 16-DIP (0.300", 7.62mm) | 16-DIP (0.300", 7.62mm) | 8-DIP (0.300", 7.62mm) | 8-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 (0.154", 3.90mm Width) | 8-CDIP (0.300", 7.62mm) |
| Supplier Device Package | 8-PDIP | 16-PDIP | 16-PDIP | 8-PDIP | 8-DIP | 8-PDIP | 8-PDIP | 8-Mini DIP | 14-SOIC | 8-CDIP |
