| PartNumber | KST55MTF | KST5551MTF | KST5550MTF |
| Description | Bipolar Transistors - BJT PNP Si Transistor Epitaxial | Bipolar Transistors - BJT NPN Si Transistor Epitaxial | |
| Manufacturer | ON Semiconductor | FAIRCHILD | FAIRCHIL |
| Product Category | Bipolar Transistors - BJT | Transistors (BJT) - Single | Transistors (BJT) - Single |
| RoHS | Y | Details | - |
| Mounting Style | SMD/SMT | SMD/SMT | SMD/SMT |
| Package / Case | SOT-23-3 | SOT-23 | - |
| Transistor Polarity | PNP | NPN | NPN |
| Configuration | Single | Single | Single |
| Collector Emitter Voltage VCEO Max | - 60 V | 160 V | - |
| Collector Base Voltage VCBO | - 60 V | 180 V | - |
| Emitter Base Voltage VEBO | - 4 V | 6 V | - |
| Collector Emitter Saturation Voltage | - 0.25 V | 0.2 V | 0.25 V |
| Maximum DC Collector Current | 0.5 A | 0.6 A | 0.6 A |
| Gain Bandwidth Product fT | 50 MHz | 300 MHz | 300 MHz |
| Maximum Operating Temperature | + 150 C | + 150 C | + 150 C |
| Series | KST55 | - | - |
| Height | 0.93 mm | - | - |
| Length | 2.92 mm | - | - |
| Packaging | Reel | Reel | Reel |
| Width | 1.3 mm | - | - |
| Brand | ON Semiconductor / Fairchild | Fairchild Semiconductor | - |
| Continuous Collector Current | - 0.5 A | 0.6 A | 0.6 A |
| DC Collector/Base Gain hfe Min | 50 | 80 | - |
| Pd Power Dissipation | 350 mW | 350 mW | - |
| Product Type | BJTs - Bipolar Transistors | - | - |
| Factory Pack Quantity | 3000 | - | - |
| Subcategory | Transistors | - | - |
| Unit Weight | 0.000282 oz | 0.002116 oz | 0.002116 oz |
| DC Current Gain hFE Max | - | 250 | 250 |
| Minimum Operating Temperature | - | - 55 C | - |
| Part # Aliases | - | KST5551MTF_NL | - |
| Part Aliases | - | - | KST5550MTF_NL |
| Package Case | - | - | SOT-23 |
| Pd Power Dissipation | - | - | 350 mW |
| Collector Emitter Voltage VCEO Max | - | - | 140 V |
| Collector Base Voltage VCBO | - | - | 160 V |
| Emitter Base Voltage VEBO | - | - | 6 V |
| DC Collector Base Gain hfe Min | - | - | 60 |