2N5459 JFET N-Channel Metal Transistor 25V 10mA TO-72

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2N5459 Metal Case N-Channel JFET Transistor TO-72 The 2N5459 JFET N-Channel Metal Transistor TO-72 is a premium silicon N-channel junction field-effect transistor housed in a hermetic TO-72 four-pin metal can package that delivers exceptional electromagnetic shielding and long-term mechanical durability for professional and demanding electronic applications. This depletion-mode device offers high input impedance along with low noise characteristics making it ideal for precision low-level signal amplification analog switching and high-impedance buffering tasks. The robust metal enclosure with its dedicated case shield pin provides superior protection against environmental interference vibration and thermal stress compared to plastic alternatives ensuring reliable performance in harsh operating conditions. Widely used in audio preamplifiers sensor interfaces medical instrumentation legacy military equipment and test gear this transistor simplifies circuit design through interchangeable source and drain terminals while maintaining consistent fidelity across extended service life. Its proven construction continues to serve as a benchmark solution for engineers requiring a compact yet rugged N-channel JFET in critical analog applications. Features Premium silicon N-channel junction field-effect transistor construction delivering exceptional reliability for precision analog applications. Hermetic TO-72 four-pin metal can package providing superior environmental protection against moisture, dust, and contamination. Integral metal enclosure with dedicated case shield pin ensuring outstanding electromagnetic shielding and reduced external interference. High input impedance minimizing loading effects on upstream circuitry for clean signal handling. Low noise performance ideal for sensitive low-level amplification and high-fidelity audio circuits. Depletion-mode operation offering normally-on behavior with accurate gate control for versatile switching. Interchangeable source and drain terminals simplifying PCB layout and enhancing design flexibility. Robust mechanical durability withstanding vibration, thermal cycling, and harsh operating conditions. Extended service life making it the preferred choice for legacy military, medical, and test equipment. Proven reliability in professional instrumentation where plastic-packaged alternatives may fail. Pin Configuration Pin Number Terminal Name Function / Connection Pin 1 Drain The terminal where majority carriers leave the channel. Pin 2 Source The terminal where majority carriers enter the channel. Pin 3 Gate The control terminal that modulates the channel conductivity. Pin 4 Case (Shield) Internally connected to the metal can to reduce electrical noise. Dimensions Body Diameter: 4.5mm Pin Circle Diameter: 0.2mm Body Height: 4.8mm Lead Length: 13mm Specifications Attribute Parameter Value Product Category – JFETs Series – 2N5459 Technology – Silicon (Si) Mounting Style – Through Hole Package/Case – TO-72 Transistor Polarity – N-Channel Configuration – Single Gate-Source Breakdown Voltage VGSS -25 V Drain-Source Current at VGS=0 (IDSS) IDSS 4.0 mA to 16 mA Absolute Maximum Drain Current ID(max) 10 mA Power Dissipation PD 625 mW Forward Transconductance (Min) gfs 2 ms to 6 ms Applications Low noise audio preamplifiers. General purpose signal amplifiers. Analog switches and multiplexers. Constant current sources. RF amplifiers and oscillators. Sensor interfaces. Voltage controlled resistors. High input impedance buffers. Package Contents 1 x 2N5459 JFET N-Channel Metal Transistor 25V 10mA TO-72 Datasheet 2N5459