Surface Mount Hyperabrupt Wide-Band Tuning Varactors MA4ST079 thru 083 V3.00 SOT-23 Features ● ● ● ● ● ● ● ● Low Cost Very High Capacitance Ratio from 1 to 8 Volts Surface Mount Package High Quality Factor Useful for Battery Applications SPC Monitored Ion Implantation for Excellent C-V Repeatability Singles and Common Cathode Pairs Available in Tape and Reel Description The MA4ST079 through MA4ST083 series of silicon hyperabrupt junction tuning varactors is produced with ion implantation and advanced epitaxial growth techniques. These diodes have thermal oxide passivation, and feature very high capacitance ratio and quality factor. They are well suited for use from the sub-HF through UHF frequency range. The standard capacitance tolerance is ±10%, with tighter tolerances available. Capacitance matching at one or more bias voltages is also available. Configurations TOP VIEW (SINGLE) (COMMON CATHODE PAIR) Applications The MA4ST079 through MA4ST083 series of hyperabrupt junction tuning varactors is suggested for usage where a large frequency change is required with only a small change in tuning voltage. This series is appropriate for usage in wide band voltage controlled oscillators and voltage controlled filters which require the largest rate of change of capacitance with voltage. The large change in capacitance from 1 to 8 volts makes them very attractive for battery operated or other systems with limited available control voltage. The MA4ST079 through MA4ST083 family can be used in VCOs and VTFs from approximately 100 KHz through the UHF frequency band. Specifications Subject to Change Without Notice. M/A-COM, Inc. North America: 1 Tel. (800) 366-2266 Fax (800) 618-8883 ■ Asia/Pacific: Tel. +81 3 3263 8761 Fax +81 3 3263 8769 ■ Europe: Tel. +44 (1344) 869 595 Fax +44 (1344) 300 020 Surface Mount Hyperabrupt Wide-Band Tuning Varactors MA4ST079 thru 083 V3.00 Electrical Specifications @ 25°C Breakdown Voltage @ IR = 10 µA, VB = 12 Volts Minimum Reverse Leakage Current @ VR = 10 Volts, IR = 100 nA Maximum Temperature Coefficient ot Capacitance @ VR = 8 Volts, TCC = 400 ppm/°C Typical Model Number Minimum Total Capacitance (pF) Total Capacitance (pF) f = 1 MHz VR = 1 Volt f = 1 MHz VR = 2.5 Volts min. max. Maximum Maximum Total Capacitance Total Capacitance (pF) (pF) Typical Total Capacitance Ratio CT1/CT8 Typical Q f = 1 MHz VR = 4 Volts f = 1 MHz VR = 8 Volts f = 1 MHz VR = 1/ VR=8 f = 50 MHz VR = 4 Volts MA4ST079 87.4 48.7 59.5 27.3 11.8 9.1 80 MA4ST080 40.0 22.3 27.3 13.1 5.5 8.9 150 MA4ST081 16.2 9.1 11.1 5.2 2.4 8.5 300 MA4ST082 11.5 6.6 8.0 3.8 1.8 8.2 350 MA4ST083 7.9 4.5 5.5 2.6 1.3 7.8 450 Absolute Maximum Ratings @ 25°C Parameter Absolute Maximum Reverse Voltage 12 Volts Junction Temperature -65°C to +125°C Storage Temperature -65°C to +125°C Forward Current 50 mA Power Dissipation Ordering Information The part numbers shown are for single diodes. When ordering diodes in common cathode pairs add suffix “CK.” For example, MA4ST079CK specifies model number MA4ST079 as a common cathode pair. To order parts on tape and reel add suffix T/R to the end of the part number. i.e. MA4ST079-T/R 50 mW @ 25°C Specifications Subject to Change Without Notice. M/A-COM, Inc. 2 North America: Tel. (800) 366-2266 Fax (800) 618-8883 ■ Asia/Pacific: Tel. +81 3 3263 8761 Fax +81 3 3263 8769 ■ Europe: Tel. +44 (1344) 869 595 Fax +44 (1344) 300 020 Surface Mount Hyperabrupt Wide-Band Tuning Varactors MA4ST079 thru 083 V3.00 Case Style SOT-23 (High Profile) INCHES Package Capacitance = 0.15 pF typical Package Inductance = 2 nH typical MILLIMETERS DIM. MIN. MAX. MIN. MAX. A — 0.048 — 1.22 B — 0.008 — 0.20 C — 0.040 — 1.00 D 0.013 0.020 0.35 0.50 E 0.003 0.006 0.08 0.15 F 0.110 0.119 2.80 3.00 G 0.047 0.056 1.20 1.40 H 0.037 typical 0.95 typical J 0.075 typical 1.90 typical K 0.103 2.60 L 0.024 0.60 DIM. GRADIENT M 10° max.1 N 2°…30º Note: 1. Applicable on all sides Typical Performance Curves TOTAL CAPACITANCE vs REVERSE VOLTAGE NOMINAL Q vs REVERSE VOLTAGE Specifications Subject to Change Without Notice. M/A-COM, Inc. North America: 3 Tel. (800) 366-2266 Fax (800) 618-8883 ■ Asia/Pacific: Tel. +81 3 3263 8761 Fax +81 3 3263 8769 ■ Europe: Tel. +44 (1344) 869 595 Fax +44 (1344) 300 020