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| Part Number | UC3844J | UC3846J | UC3844N | UC3845J | UC3843J | UC3844D |
|---|---|---|---|---|---|---|
| Manufacturer | Texas Instruments | Texas Instruments | Texas Instruments | Unitrode | Unitrode | Fairchild Semiconductor |
| Product Status | Active | Active | Active | Active | Active | Obsolete |
| Output Type | 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-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-Down |
| Output Configuration | Positive, Isolation Capable | Positive | Positive, Isolation Capable | Positive | Positive, Isolation Capable | Positive, Isolation Capable |
| Topology | Boost, Buck, Buck-Boost, Flyback, Forward | Boost, Flyback, Forward Converter, Half-Bridge, Push-Pull | Boost, Buck, Buck-Boost, Flyback, Forward | - | Boost, Buck, Buck-Boost, Flyback, Forward | Boost, Buck, Buck-Boost, Flyback, Forward |
| Number of Outputs | 1 | 2 | 1 | 1 | 1 | 1 |
| Output Phases | 1 | 1 | 1 | 1 | 1 | 1 |
| Voltage - Supply (Vcc/Vdd) | 12V ~ 28V | 6.95V ~ 40V | 12V ~ 28V | 12V ~ 28V | 12V ~ 28V | 10V ~ 30V |
| Frequency - Switching | Up to 500kHz | 500kHz | Up to 500kHz | 100kHz | Up to 500kHz | Up to 500kHz |
| Duty Cycle (Max) | 48% | 50% | 48% | 48% | 97% | 48% |
| Synchronous Rectifier | No | Yes | No | No | No | No |
| Clock Sync | No | Yes | No | No | No | No |
| Serial Interfaces | - | - | - | - | - | - |
| Control Features | Frequency Control | Current Limit, Enable, Frequency Control, Soft Start | 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) |
| Mounting Type | Through Hole | Through Hole | Through Hole | Through Hole | Through Hole | Surface Mount |
| Package / Case | 8-CDIP (0.300", 7.62mm) | 16-CDIP (0.300", 7.62mm) | 8-DIP (0.300", 7.62mm) | 8-CDIP (0.300", 7.62mm) | 8-CDIP (0.300", 7.62mm) | 14-SOIC (0.209", 5.30mm Width) |
| Supplier Device Package | 8-CDIP | 16-CDIP | 8-PDIP | 8-CDIP | 8-CDIP | 14-SOP |
