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| Part Number | VIPER28LN | VIPER25LN | VIPER26LN | VIPER27LN | VIPER28HN | VIPER28LD | VIPER28LE | 
|---|---|---|---|---|---|---|---|
| Manufacturer | STMicroelectronics | STMicroelectronics | STMicroelectronics | STMicroelectronics | STMicroelectronics | STMicroelectronics | STMicroelectronics | 
| Product Status | Active | Obsolete | Active | Active | Active | Active | Obsolete | 
| Output Isolation | Isolated | Isolated | Either | Isolated | Isolated | Isolated | Isolated | 
| Internal Switch(s) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | 
| Voltage - Breakdown | 800V | 800V | 800V | 800V | 800V | 800V | 800V | 
| Topology | Flyback | Flyback | Flyback | Flyback | Flyback | Flyback | Flyback | 
| Voltage - Start Up | 14 V | 14 V | 13 V | 14 V | 14 V | 14 V | 14 V | 
| Voltage - Supply (Vcc/Vdd) | 8.5V ~ 23.5V | 8.5V ~ 23.5V | 11.5V ~ 23.5V | 8.5V ~ 23.5V | 8.5V ~ 23.5V | 8.5V ~ 23.5V | 8.5V ~ 23.5V | 
| Duty Cycle | 80% | - | 70% | 80% | 80% | 80% | 80% | 
| Frequency - Switching | 60kHz | 136kHz | 60kHz | 60kHz | 115kHz | 60kHz | 60kHz | 
| Power (Watts) | 16 W | 20 W | 20 W | 20 W | 16 W | 16 W | 16 W | 
| Fault Protection | Current Limiting, Over Temperature, Over Voltage, Short Circuit | Current Limiting, Over Temperature, Over Voltage | Current Limiting, Over Temperature | Current Limiting, Over Temperature, Over Voltage | Current Limiting, Over Temperature, Over Voltage, Short Circuit | Current Limiting, Over Temperature, Over Voltage, Short Circuit | Current Limiting, Over Temperature, Over Voltage, Short Circuit | 
| Control Features | - | - | - | - | - | - | - | 
| Operating Temperature | -40°C ~ 150°C (TJ) | -40°C ~ 150°C (TJ) | -40°C ~ 150°C (TJ) | -40°C ~ 150°C (TJ) | -40°C ~ 150°C (TJ) | -40°C ~ 150°C (TJ) | -40°C ~ 150°C (TJ) | 
| Package / Case | 8-DIP (0.300", 7.62mm), 7 Leads | 8-DIP (0.300", 7.62mm), 7 Leads | 8-DIP (0.300", 7.62mm), 7 Leads | 8-DIP (0.300", 7.62mm), 7 Leads | 8-DIP (0.300", 7.62mm), 7 Leads | 16-SOIC (0.154", 3.90mm Width) | 10-SDIP (0.300", 7.62mm) | 
| Supplier Device Package | 7-DIP | 7-DIP | 7-DIP | 7-DIP | 7-DIP | 16-SO | 10-SDIP | 
| Mounting Type | Through Hole | Through Hole | Through Hole | Through Hole | Through Hole | Surface Mount | Through Hole |