| Parameters | 
                                    
                                                                                                            
                                        | Mfr | 
                                        Littelfuse Inc. | 
                                    
                                                                        
                                        | Series | 
                                        - | 
                                    
                                                                        
                                        | Package | 
                                        Bulk | 
                                    
                                                                        
                                        | Product Status | 
                                        Discontinued at Digi-Key | 
                                    
                                                                        
                                        | Voltage - Off State | 
                                        400 V | 
                                    
                                                                        
                                        | Voltage - Gate Trigger (Vgt) (Max) | 
                                        1.5 V | 
                                    
                                                                        
                                        | Current - Gate Trigger (Igt) (Max) | 
                                        30 mA | 
                                    
                                                                        
                                        | Voltage - On State (Vtm) (Max) | 
                                        1.6 V | 
                                    
                                                                        
                                        | Current - On State (It (AV)) (Max) | 
                                        12.8 A | 
                                    
                                                                        
                                        | Current - On State (It (RMS)) (Max) | 
                                        20 A | 
                                    
                                                                        
                                        | Current - Hold (Ih) (Max) | 
                                        40 mA | 
                                    
                                                                        
                                        | Current - Off State (Max) | 
                                        10 µA | 
                                    
                                                                        
                                        | Current - Non Rep. Surge 50, 60Hz (Itsm) | 
                                        255A, 300A | 
                                    
                                                                        
                                        | SCR Type | 
                                        Standard Recovery | 
                                    
                                                                        
                                        | Operating Temperature | 
                                        -40°C ~ 125°C | 
                                    
                                                                        
                                        | Mounting Type | 
                                        Through Hole | 
                                    
                                                                        
                                        | Package / Case | 
                                        TO-220-3 Isolated Tab | 
                                    
                                                                        
                                        | Supplier Device Package | 
                                        TO-220 Isolated Tab | 
                                    
                                                                        
                                        | RoHS Status | 
                                        ROHS3 Compliant | 
                                    
                                                                        
                                        | Moisture Sensitivity Level (MSL) | 
                                        1  (Unlimited) | 
                                    
                                                                        
                                        | ECCN | 
                                        EAR99 | 
                                    
                                                                        
                                        | HTSUS | 
                                        8541.30.0080 | 
                                    
                                                                        
                                        | Other Names | 
                                        -S4020L | 
                                    
                                                                        
                                        | Standard Package | 
                                        500 | 
                                    
                                                                                                        
                            
                         
                                                SCR 400 V 20 A Standard Recovery Through Hole TO-220 Isolated Tab