| Parameters | 
                                
                                                                                                            
                                            | Factory Lead Time | 
                                            11 Weeks | 
                                        
                                                                            
                                            | Mount | 
                                            Through Hole | 
                                        
                                                                            
                                            | Mounting Type | 
                                            Through Hole | 
                                        
                                                                            
                                            | Package / Case | 
                                            Axial | 
                                        
                                                                            
                                            | Operating Temperature | 
                                            -55°C~125°C | 
                                        
                                                                            
                                            | Packaging | 
                                            Tray | 
                                        
                                                                            
                                            | Published | 
                                            2014 | 
                                        
                                                                            
                                            | Series | 
                                            TANTALEX®, 109D | 
                                        
                                                                            
                                            | Size / Dimension | 
                                            0.406Diax1.217L 10.31mmx30.91mm | 
                                        
                                                                            
                                            | Tolerance | 
                                            ±10% | 
                                        
                                                                            
                                            | Feature | 
                                            Wet Tantalum | 
                                        
                                                                            
                                            | Part Status | 
                                            Active | 
                                        
                                                                            
                                            | Moisture Sensitivity Level (MSL) | 
                                            Not Applicable | 
                                        
                                                                            
                                            | Termination | 
                                            Axial | 
                                        
                                                                            
                                            | Type | 
                                            Hermetically Sealed | 
                                        
                                                                            
                                            | Max Operating Temperature | 
                                            125°C | 
                                        
                                                                            
                                            | Min Operating Temperature | 
                                            -55°C | 
                                        
                                                                            
                                            | Voltage - Rated | 
                                            10V | 
                                        
                                                                            
                                            | Capacitance | 
                                            1200μF | 
                                        
                                                                            
                                            | ESR (Equivalent Series Resistance) | 
                                            1Ohm | 
                                        
                                                                            
                                            | Manufacturer Size Code | 
                                            K | 
                                        
                                                                            
                                            | Length | 
                                            30.9118mm | 
                                        
                                                                            
                                            | RoHS Status | 
                                            Non-RoHS Compliant | 
                                        
                                                                                                    
                            
                         
                                                109D128X9010K2 Overview
Similarly, equivalent series resistance (ESR) is also known as internal resistance, as it represents the loss of useful energy in a simple electronic circuit consisting of a resistor and an ideal (perfect) capacitor.
109D128X9010K2 Features
109D128X9010K2 Applications
There are a lot of Vishay Sprague 109D128X9010K2 applications of tantalum capacitors. 
- Consumer
 - Telecom infrastructure
 - General purpose
 - Industrial
 - General low power DC/DC and LDO
 - Avionics,
 - ABS
 - Military / aerospace
 - Avionics / military / space
 - General purpose