electronics inc. LT-3/94 SERIES EVAR EXPONENTIAL VARACTOR for 1M220 - 1250 1T220 ~ 1T250 FREQUENCY-VOLTAGE LINEAR TUNING po220 - pozs0 The MSI Series 220 EVAR exponential varactor tuning diodes feature a 7:1 minimum capacitance tuning ratio from 0.5 to 10 volta for wide band tuning applications. For a varactor with a nominal capacitance, Coom OF 6.8 pf at 2.5 volts bias, the Q at 50 MHz is 200 and for a larger capacitance varactor diode where C,.,, = 100 pf, the Q at 2.5 volts is 75 minimum. The relatively linear variation of log C va V a between 0.5 and 4.5 volts, as shown in the typical plots for three & types, can be used to advantage in design of frequency-voltage linear a tuning circuits. % me ~ In axial leaded glass DO-7, in the surface mount MSI Case 1M alumina z substrate with epoxy encapsulation or in the surface mount MSI-123 4 epoxy encapsulated package with soider coated leads to fit SOD 123 w solder pads, the MSI Seriea 220 EVAR tuning diodes are for reliable 8 uses in VCOs, FM modulators, phase shifters, tunable filters, phase a locked loops, preselectors, and in other applications from HF to UHF. ELECTRICAL CHARACTERISTICS (Ta= 259 2 Type Nos. Chom = Cais Qa.s 3 Package Styles Capacitance, pf Figure of Merit REVERSE VOLTAGE (VOLTS) Surface Mount Axial @2,5V/1 MHz @ 2.5V/50 MHz 1M [MSI-123| DO-7 min nom j max min Capacitance Ratio, C Cc 7.0 min/9.0 max 1m220 | 17220 | po220 |] 5.4 6.8 8.0 200 P 1 So-o/Cr0 Reverse Voltage, V, (min 12Vde @ I,=10uAde 1M224 17224 DO224 8.1 10.0 12.0 200 ge, Vn ( ) Reverse Current, I wha 0.01uA @ V,=10Vdce 1M228 1T228 Do228 12.1 15.0 18.0 175 Te (max) @ Va . . . 1 5 . M234 17234 do234 18.1 22.0 26.4 25 1) To order diodes with C,.,, t 10%, add suffix A to the type no.; for diodes with Cc. t 5%, add 46 33.0 37.5 125 nom 1M238 17236 po238 26 suffix B; for sets of 2 diodes matched to 13% at 0.5, 2.5 and 4.5 volts, add suffix -2M, for 2 7.6 47.0 52.0 100 ' , IM242 fede poze 3 3 diodes, add suffix -3M, for 4, add suffix -4M. 1M246 1T246 DO246 Z2.1 64.06 60.0 75 1M250 1T250 DO250 60.1 100.0 120.0 75 n m pO-7 ?) a Millimeters Inches D Dia. + a 4 j Dia 2) fot Se Dim] min max min max ontacts a . = A | 5.64 | 7.62 || 0.230 | 0.300 rs je k + B 2.16 2.72 0.065 0.107 UZ D 0.46 0.56 0.018 0.022 K 125.40 2.000 4 W Z YA} MSI-123 Cathode Millimeters Inchea Case iM Dim} min max min max A 2.54 2.84 0.100 0.112 Millimeters Inchea c 0.94 1,35 0.037 G.053 D 1.40 1.70 0.055 0.067 Dim min max min max F - 0.15 - | 0.006 L | 3.15 | 3.43 ] 0.124 | 0.135 G 0.46 0.64 0.018 0.025 Ww 2.41 2.62 0.095 0.103 K {| 0.20 | 0.41 |{ 6.008 | 0.016 S | 0.69 | 0.84 |] 0.027 }| 0.033 L 3.56 3.86 0.140 0.152 T 0.91 1.17 0.036 0.046 (VS U MANUFACTURED BY electronics me. 71