MJE340 NPN BJT Transistor 300V 500mA TO-126

MJE340 NPN BJT Transistor 300V 500mA TO-126 The MJE340 is a silicon planar NPN bipolar junction transistor designed for medium‑power linear and switching applications. It withstands high voltages (up to 300 V) while handling collector currents up to 500 mA. Packaged in a TO‑126 (SOT‑32) case, it pairs complementarily with the PNP MJE350 for push–pull stages and amplifier designs. Features • High voltage capability: 300 V collector–emitter and collector–base ratings • Medium current rating: 0.5 A continuous collector current • Complementary pairing: Matches with MJE350 PNP transistor for push–pull designs • Standard through‑hole TO‑126 package for easy PCB mounting • SOT‑32 (TO‑126) package simplifies heat sinking and industrial assembly Specifications Absolute Maximum Ratings Parameter | Symbol | Value | Unit Collector–Base Voltage | VCBO | 300 | V Collector–Emitter Voltage | VCEO | 300 | V Emitter–Base Voltage | VEBO | 3 | V Continuous Collector Current | IC | 0.5 | A Total Power Dissipation (Tc = 25 °C) | PTOT | 20.8 | W Storage Temperature | Tstg | –65 to +150 | °C Junction Temperature | TJ | –65 to +150 | °C Thermal Data Parameter | Symbol | Value | Unit Thermal Resistance, Junction–to–Case | RθJC | 6 | °C/W Electrical Characteristics (Tcase = 25 °C unless noted) Parameter | Symbol | Test Conditions | Min | Typ | Max | Unit Collector cut‑off current | ICBO | V CB =300 V, I E =0 | — | — | 100 µA | µA Emitter cut‑off current | IEBO | V EB =3 V, I C =0 | — | — | 100 µA | µA Collector–Emitter sustaining voltage | V CEO(sus) | I C =1 mA, I B =0 | 300 | — | — | V Emitter–Base on voltage | V BE(on) | I C =50 mA, V CE =10 V | — | — | 1 | V Collector–Emitter saturation voltage | V CE(sat) | I C =100 mA, I B =10 mA | — | — | 0.5 | V DC current gain | h FE | I C =50 mA, V CE =10 V | 30 | 240 | — | — Applications • Linear power supplies and regulators • Audio amplifier output stages • Motor control and driver circuits • Industrial switching equipment • High‑voltage amplifier stages DataSheet • MJE340 MJE350