High-reliability discrete products and engineering services since 1977 FEATURES: MU2646, MU2647 SILICON UNIJUNCTION TRANSISTORS Available as “HR” (high reliability) screened per MIL-PRF-19500, JANTX level. Add “HR” suffix to base part number Available Non-RoHS (standard) or RoHS compliant (add PBF suffix) MAXIMUM RATINGS Rating Power dissipation(1) RMS emitter current Peak pulse emitter current (2) Symbol Value Unit PD 300 mW IE(RMS) 50 mA IE 2 Amps Emitter reverse voltage VB2E 30 Volts Interbase voltage VB2B1 35 Volts Operating junction temperature range TJ -65 to 125 °C Storage temperature range Tstg -65 to 150 °C Note 1: Derate 3mW/°C increase in ambient temperature. The total power dissipation must be limited by the external circuitry. Note 2: Capacitor discharge – 10µF or less, 30 volts or less. ELECTRICAL CHARACTERISTICS (TA = 25°C unless otherwise specified) Parameter Intrinsic standoff ratio (VB2B1 = 10V) (1) MU2646 MU2647 Symbol Min Typ Max Unit η 0.56 0.68 - 0.75 0.82 - 4.7 7 9.1 0.1 - 0.9 - 3.5 - - 15 - Interbase resistance (VB2B1 = 3V, IE = 0) rBB Interbase resistance temperature coefficient (VB2B1 = 3V, IE = 0, TA = -55° to 125°C) αrBB Emitter saturation voltage (VB2B1 = 10V, IE = 50mA)(2) VEB1(sat) Modulated interbase current (VB2B1 = 10V, IE = 50mA) IB2(mod) Emitter reverse current (VB2E = 30V, IB1 = 0) Peak point emitter current (VB2B1 = 25V) Valley point current (VB2B1 = 20V, RB2 = 100ohms)(2) Base-one peak pulse voltage(3) kohms %/°C Volts mA MU2646 MU2647 IEB2O - 0.005 0.005 12 0.2 µA MU2646 MU2647 IP - 1 1 5 2 µA MU2646 MU2647 IV 4 8 6 10 18 mA VOB1 3 6 5 7 - Volts MU2646 MU2647 Note 1: Intrinsic standoff ratio: η = (VP-VF)/VB2B1, where VP = peak point emitter voltage , VB2B1 = interbase voltage, VF = emitter to base one junction diode drop (≈ 0.45V @ 10µA). Note 2: PW ≈ 300µs, duty cycle≤ 2% to avoid internal heating due to interbase modulation which may result in erroneous readings Note 3: Base one peak pulse voltage is used to ensure minimum pulse amplitude for applications in SCR firing circuits and other types of pulse circuits. Rev. 20121009 High-reliability discrete products and engineering services since 1977 MECHANICAL CHARACTERISTICS Case TO-92 Marking Body painted, alpha-numeric Polarity Cathode band MU2646, MU2647 SILICON UNIJUNCTION TRANSISTORS Rev. 20121009