1T408 Variable Capacitance Diode Description The 1T408 is a variable capacitance diode designed for electronic tuning of wide-band CATV tuners using a super-small-miniature flat package (SSVC). M-290 Features • Super-small-miniature flat package • Small series resistance 0.75Ω Max. (f = 470MHz) • Large capacitance ratio 11.7 Typ. (C2/C25) 18.0 Typ. (C1/C28) • Small leakage current 10nA Max. (VR = 28V) • Capacitance deviation in a matching group: within 2% Applications Electronic tuning of wide-band CATV tuners Structure Silicon epitaxial planar-type diode Absolute Maximum Ratings (Ta = 25°C) • Reverse voltage VR 34 • Operating temperature Topr –20 to +75 • Storage temperature Tstg –65 to +150 V °C °C Electrical Characteristics Item Reverse current Diode capacitance Capacitance ratio (Ta = 25°C) Symbol Conditions Min. Typ. Max. Unit 10 nA IR VR = 28V C2 VR = 2V, f = 1MHz 29.46 35.46 pF C25 VR = 25V, f = 1MHz 2.49 2.89 pF C2/C25 11.0 C25/C28 1.03 11.7 Series resistance rs CD = 14pF, f = 470MHz 0.75 Ω Capacitance deviation in a matching group ∆C VR = 2 to 25V, f = 1MHz 2 % Sony reserves the right to change products and specifications without prior notice. This information does not convey any license by any implication or otherwise under any patents or other right. Application circuits shown, if any, are typical examples illustrating the operation of the devices. Sony cannot assume responsibility for any problems arising out of the use of these circuits. –1– E97522-PS 1T408 Example of Representative Characteristics Diode capacitance vs. Reverse voltage Reverse current vs. Ambient temperature 100 VR = 28V Ta = 25°C 100 20 IR – Reverse current [pA] C – Diode capacitance [pF] 50 10 5 2 10 1 1 2 5 10 20 VR – Reverse voltage [V] 50 1 –20 Forward voltage vs. Ambient temperature 50 IF = 1mA VR – Reverse voltage [V] VF – Forward voltage [V] 80 Reverse voltage vs. Ambient temperature 0.80 0.70 0.60 0.50 –20 0 20 40 60 Ta – Ambient temperature [°C] 0 20 40 60 Ta – Ambient temperature [°C] IR = 10µA 45 40 35 –20 80 –2– 0 20 40 60 Ta – Ambient temperature [°C] 80 1T408 Diode capacitance vs. Ambient temperature 1.03 C [Ta] / C [25°C] – Diode capacitance VR = 1V VR = 2V 1.02 VR = 7V 1.01 VR = 15V VR = 25V 1.00 0.99 0.98 –20 0 20 40 60 Ta – Ambient temperature [°C] 80 Reverse current vs. Reverse voltage Temperature coefficient of diode capacitance 1000 1000 Temperature coefficient [ppm/°C] Ta = 80°C IR – Reverse current [pA] Ta = 60°C 100 Ta = 25°C 500 200 100 50 1 10 1 1 3 10 VR – Reverse voltage [V] 50 –3– 2 5 10 VR – Reverse voltage [V] 20 50 1T408 Package Outline Unit: mm 0.2 M A M-290 0.2 ± 0.05 10° MAX 1.7 ± 0.1 1.3 ± 0.1 A 0.8 ± 0.1 c b 10° MAX 0.7 ± 0.1 BASE METAL WITH PLATING c 0.11 ± 0.005 + 0.05 0.11 – 0.01 b 0.3 ± 0.025 0.05 0.3 –+ 0.02 PACKAGE MATERIAL EPOXY RESIN LEAD TREATMENT SOLDER PLATING EIAJ CODE LEAD MATERIAL COPPER JEDEC CODE PACKAGE WEIGHT 0.002g SONY CODE M-290 –4–