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| Part Number | UC2851N | UC2861N | UC3851N | 
|---|---|---|---|
| Manufacturer | Texas Instruments | Unitrode | Texas Instruments | 
| Product Status | Active | Active | Active | 
| Output Isolation | - | Non-Isolated | - | 
| Internal Switch(s) | No | Yes | No | 
| Voltage - Breakdown | - | - | - | 
| Topology | Boost, Buck, Flyback, Forward | Full-Bridge, Half-Bridge, Push-Pull | Boost, Buck, Flyback, Forward | 
| Voltage - Start Up | 8 V | 16.5 V | 8 V | 
| Voltage - Supply (Vcc/Vdd) | 7.8V ~ 32V | 10.5V ~ 22V | 7.8V ~ 32V | 
| Duty Cycle | 50% | - | 50% | 
| Frequency - Switching | Up to 500kHz | 10kHz ~ 1MHz | Up to 500kHz | 
| Power (Watts) | - | - | - | 
| Fault Protection | Current Limiting, Over Voltage | - | Current Limiting, Over Voltage | 
| Control Features | Frequency Control, Soft Start | Soft Start | Frequency Control, Soft Start | 
| Operating Temperature | -40°C ~ 85°C (TA) | -25°C ~ 85°C (TA) | 0°C ~ 70°C (TA) | 
| Package / Case | 18-DIP (0.300", 7.62mm) | 16-DIP (0.300", 7.62mm) | 18-DIP (0.300", 7.62mm) | 
| Supplier Device Package | 18-PDIP | 16-PDIP | 18-PDIP | 
| Mounting Type | Through Hole | Through Hole | Through Hole |