1T397 Variable Capacitance Diode Description The 1T397 is a variable capacitance diode designed for the electronic tuning of wide band CATV tuners, and it has a super miniature package. Features • Super miniature package • Large capacitance ratio C2/C25=14.5 Min. C1/C28=21.5 Min. C25/C28=1.03 Min. • Small series resistance rs=1.1 Ω Max. • High reverse voltage VR=34 V M-235 Absolute Maximum Ratings (Ta=25 °C) • Reverse voltage VR 34 • Operating temperature Topr –20 to +75 • Storage temperature Tstg –65 to +150 Structure Silicon epitaxial planar-type diode Electrical Characteristics Item Reverse current Reverse voltage Diode capacitance Capacitance ratio Series resistance Capacitance deviation in a matching group V °C °C (Ta=25 °C) Symbol IR VR C2 C25 C2/C25 C1/C28 C25/C28 rs ∆C Conditions 51.0 3.03 Unit nA V pF pF CD=14 pF, f=470 MHz 1.1 Ω VR=1 to 28 V 2.0 % VR=28 V IR=1 µA VR=2 V, f=1 MHz VR=25 V, f=1 MHz Min. 34 42.9 2.60 14.5 21.5 1.03 Typ. Max. 10 15.5 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— E94610B83-TE 1T397 Diode capacitance vs. Reverse voltage temperature Reverse current vs. Ambient temperature 100 1.000 VR=28V Ta=25°C 20 10 IR Reverse current (nA) C-Diode capacitance (pF) 50 5 2 0.100 0.010 1 1 2 10 5 50 20 VR - Reverse voltage temperature 0.001 –20 0 20 40 80 60 Ta - Ambient temperature (°C) Forward voltage vs. Ambient temperature Reverse voltage vs. Ambient temperature 50 IF=1mA IR=10µA 0.80 0.70 0.60 –20 0 20 40 60 80 VR - Reverse voltage (V) VF Forward voltage (V) 0.90 45 40 35 Ta - Ambient temperature (°C) 30 -20 0 20 40 60 Ta - Ambient temperature (°C) —2— 80 1T397 Diode capacitance vs. Ambient temperature 1.03 VR=1V C (Ta) Diode capacitance C (25°C) 1.02 VR=2V VR=7V VR=25V VR=15V 1.01 1.00 0.99 0.98 –20 0 20 40 60 80 Ta - Ambient temperature (°C) Thermal coeffcient of diode capacitance vs. Reverse voltage Thermal coeffcient of diode capacitance (ppm/°C) Reverse current vs. Reverse voltage IR - Reverse current (nA) 0.100 0.010 Ta=80°C Ta=60°C 0.001 Ta=25°C 0.0001 1 2 5 10 20 50 VR - Reverse voltage(V) —3— 1000 500 200 100 50 1 2 5 10 20 VR - Reverse voltage (V) 50 1T397 Package Outline Unit : mm AA AA M-235 + 0.2 ∗1.25 – 0.1 ∗0.9 ± 0.1 + 0.1 0.3 – 0.05 0.2 2.5 ± 0.2 ∗1.7 ± 0.1 2 1 + 0.1 0.3 – 0.05 0 ± 0.05 + 0.1 0.11 – 0.06 0° to 10° NOTE: Dimension “∗” does not include mold protrusion. SONY CODE M-235 EIAJ CODE JEDEC CODE Marking PACKAGE WEIGHT CATHODE MARK 0.1g 2 97 B 1 —4— Notes 1) B:Lot No.(Year and Month of manufacture) Year;Last one digit Month;A,B,C(for Oct. to Dec.) 1 to 9(for Jan.to Sept.)