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| Part Number | KST4124MTF | KST4126MTF | KST4125MTF | KST4123MTF |
|---|---|---|---|---|
| Manufacturer | onsemi | Fairchild Semiconductor | onsemi | onsemi |
| Product Status | Obsolete | Obsolete | Obsolete | Obsolete |
| Transistor Type | NPN | PNP | PNP | NPN |
| Current - Collector (Ic) (Max) | 200 mA | 200 mA | 200 mA | 200 mA |
| Voltage - Collector Emitter Breakdown (Max) | 25 V | 25 V | 30 V | 30 V |
| Vce Saturation (Max) @ Ib, Ic | 300mV @ 5mA, 50mA | 400mV @ 5mA, 50mA | 400mV @ 5mA, 50mA | 300mV @ 5mA, 50mA |
| Current - Collector Cutoff (Max) | 50nA (ICBO) | 50nA (ICBO) | 50nA (ICBO) | 50nA (ICBO) |
| DC Current Gain (hFE) (Min) @ Ic, Vce | 120 @ 2mA, 1V | 120 @ 2mA, 1V | 50 @ 2mA, 1V | 50 @ 2mA, 1V |
| Power - Max | 350 mW | 350 mW | 350 mW | 350 mW |
| Frequency - Transition | 300MHz | 250MHz | 200MHz | 250MHz |
| Operating Temperature | - | - | - | - |
| Mounting Type | Surface Mount | Surface Mount | Surface Mount | Surface Mount |
| Package / Case | TO-236-3, SC-59, SOT-23-3 | TO-236-3, SC-59, SOT-23-3 | TO-236-3, SC-59, SOT-23-3 | TO-236-3, SC-59, SOT-23-3 |
| Supplier Device Package | SOT-23-3 | SOT-23-3 | SOT-23-3 | SOT-23-3 |
