The BCX19 is an NPN small signal transistor designed for audio frequency small signal amplification. It offers high gain and low saturation voltage, complementing the BCX17. This transistor is housed in a SOT-23 (SST3) package.
| Parameter | Symbol | Conditions | Min. | Typ. | Max. | Unit |
| Absolute Maximum Ratings (Ta = 25C) | ||||||
| Collector-emitter voltage | VCES | 50 | V | |||
| Collector-emitter voltage | VCEO | 45 | V | |||
| Emitter-base voltage | VEBO | 5 | V | |||
| Collector current | IC | 500 | mA | |||
| Collector current (peak) | ICP | 1 | A | |||
| Power dissipation (PD*1) | PD*1 | Each terminal mounted on a reference land. | 200 | mW | ||
| Power dissipation (PD*2) | PD*2 | Mounted on a ceramic board(7.05.00.6mm). | 350 | mW | ||
| Power dissipation (PD*3) | PD*3 | Mounted on a ceramic board(15150.6mm). | 425 | mW | ||
| Junction temperature | Tj | 150 | ||||
| Range of storage temperature | Tstg | -65 | +150 | |||
| Electrical Characteristics (Ta = 25C) | ||||||
| Collector-emitter breakdown voltage | BVCES | IC = 50A | 50 | - | - | V |
| Collector-emitter breakdown voltage | BVCEO | IC = 10mA | 45 | - | - | V |
| Emitter-base breakdown voltage | BVEBO | IE = 50A | 5 | - | - | V |
| Collector cut-off current | ICBO | VCB = 20V | - | - | 100 | nA |
| Collector cut-off current | ICBO | VCB = 20V, Ta = 150 | - | - | 5 | A |
| Emitter cut-off current | IEBO | VEB = 5V | - | - | 10 | A |
| Collector-emitter saturation voltage | VCE(sat) | IC = 500mA, IB = 50mA | - | - | 620 | mV |
| Base-emitter turn on voltage | VBE(on) | VCE = 1V, IC = 500mA | - | - | 1.2 | V |
| DC current gain (hFE1) | hFE1 | VCE = 1V, IC = 100mA | 100 | - | 600 | - |
| DC current gain (hFE2) | hFE2 | VCE = 1V, IC = 300mA | 70 | - | - | - |
| DC current gain (hFE3) | hFE3 | VCE = 1V, IC = 500mA | 40 | - | - | - |
| Transition frequency | fT | VCE = 5V, IE = -20mA, f = 100MHz | - | 250 | - | MHz |