BF254, BF255 NPN Silicon Epitaxial Planar Transistors The BF 254 is suited for AM/FM IF amplifiers and also for short- wave, medium-wave and long-wave receiver input stages, whilst the BF 255 is preferably for use in input stages, mixers and oscillators of FM receivers. Absolute Maximum Ratings t 46% g Cli a } 5 a ry < a 3 4 he ol ke max. 05 425 Plastic case ~ TO-92 TO-18 compatible The case is impervious to light Weight approximately 0.18 g Dimensions in mm Symbol Value Unit Collector Base Voltage Veso 30 Vv Collector Emitter Voltage VcEo 20 Vv Emitter Base Voltage VeBo 5 V Collector Current Io 30 mA Power Dissipation at Tamp = 25C Prot 220") mw Junction Temperature T; 125 C Storage Temperature Range Ts 65...4+125 C ) Valid provided that leads are kept at ambient temperature at a distance of 2 mm from case 98BF254, BF255 Characteristics at Tamp = 25 C Symbol Min. Typ. Max. Unit DC Current Gain at Voce =10V, lo =1mA BF254 hee - 115 - - BF255 hee - 67 - - Base-Current at Vce = 10 V, lo = 1MA BF254 lp 45 8.7 15 pA BF255 lp 8 15 28 pA Base Emitter Voltage at Veg = 10 V, lb = 1 MA Vee - 0.68 - Vv Thermal Resistance Junction to Ambient Rina - - 450 K/W Gain Bandwidth Product at Voce = 10 V, Ilo = 1mMA BF254 fr - 260 - MHz BF255 fr - 200 - MHz Noise Figure at Voge = 10 V, Ie = 1 mA at f = 200 kHz, g, = 2mS BF254 F - 1.5 - dB at f = 1 MHz, g, = 1.5mS BF254 F - 1.2 - dB at f = 1 MHz, g, = 20 mS BF255 F - 3.5 - dB at f = 100 MHz, g, = 10 mS F - 4 - dB Noise Figure in Mixer Stages at Vcc = 10 V, lo =1mMA at f = 200 kHz, g, = 0.6 mS BF254 F, - 3 - dB at f = 1 MHz, g, = 1.2mS BF254 F, - 2 - dB at f = 200 kHz, g, = 1.2mS BF255 F, _ 4 - dB atf = 1 MHz, g, = 1.5mS BF255 F, - 2.5 - dB Feedback Capacitance Cre ~ 0.85 - pF at Vor =10V, lo = 1mA, f = 450 kHz Four Pole Parameters at Vee = 10 V, lo = 1MA at f = 450 kHz, grounded emitter Real Part of Input Admittance BF254 Gie - 0.33 _ mS BF255 Gie - 0.5 _ mS Imaginary Part of Input Admittance BF254 Die - 0.065 - mS BF255 bie _ 0.09 - mS Input Capacitance BF254 Cie - 23 = pF BF255 Cie - 32 - pF Real Part of Output Admittance BF254 Qoe - 6 _ us BF255 Goe - 2.7 - uS Imaginary Part of Output Admittance Doe - 4.5 - BS Output Capacitance Coe = 1.6 - pF Module for Reverse Transconductance BF254 | Yre | _ 2.8 - BS BF255 | Yre | - 2.6 - BS Phase of Reverse Transconductance Pre - 90 - - Module of Forward Transconductance | Yre | _ 36 - ms Phase of Forward Transconductance Pie - 0 - - at f = 10.7 MHz, grounded emitter Real Part of Inout Admittance BF254 Gie - 0.45 = ms BF255 Die - 0.6 - mS imaginary Part of Input Admittance BF254 Die - 1.5 _ mS BF255 Die - 2 - mS Input Capacitance BF254 Cie - 22 _ pF BF255 Cie - 30 - pF Real Part of Output Admittance BF254 Goe - 8.5 - BS BF255 Doe _ 4.5 - BS 99BF254, BF255 Characteristics, continuation Symbol Min. Typ. Max Unit Imaginary Part of Output Admittance Doe - 0.11 - mS Output Capacitance Coe - 1.6 - pF Module of Reverse Transconductance BF254 | Yre | - 65 - us BF255 [Ye | 60 - BS Phase of Reverse Transconductance Pre - go - = Module of Forward Transconductance | Vie | - 36 - mS Phase of Forward Transconductance Pte - 10 - - at f = 100 MHz, grounded base Real Part of Input Admittance BF254 Gib - 36 - ms BF255 Gib - 38 - mS Imaginary Part of Input Admittance BF254 bi - 3 - ms BF255 bip - 1 _ mS Input Capacitance BF254 Cip - 4.8 - pF BF255 Cip - 1.6 _ pF Real Part of Output Admittance BF254 Gob - 22 - BS BF255 Dob - 12 - us Imaginary Part of Output Admittance bop - 1.1 - mS Output Capacitance Cob _ 1.75 - pF Module of Reverse Transconductance BF254 | en | - 420 - BS BF255 | en | - 410 - BS Phase of Reverse Transconductance BF254 ~Prb ~ 88 - - BF255 Prp - 85 - - Module of Forward Transconductance BF254 | en | - 33 - ms BF255 | Yip | - 34 - ms Phase of Forward Transconductance BF254 Ptp - 146 - - BF255 Ptb _ 140 - _ ) Valid provided that leads are kept at ambient temperature at a distance of 2 mm from case 100BF254, BF255 mw 300 > Poe 200 100 Admissible power dissipation versus temperature Valid provided that leads are kept at ambient temperature at a distance of 2 mm from case BF 254,255 0 50 100 150C Tamb 101