High Q Hyperabrupt Tuning Varactors MA4ST550 Series V3.00 Case Styles Features ● ● ● ● High Q Usable Capacitance Change of 7:1 Low Reverse Leakage for Good Post Tuning Drift Characteristics Reproducible C-V Curves Description The MA4ST550 family of high Q Silicon Hyperabrupt Tuning Varactors is available in a series of low parasitic capacitance microwave packages or in chip form. The MA4ST550 series of diodes is available with junction capacitances of approximately 0.8 pF to 8.2 pF at -4 volts. These diodes have capacitance change ratios as high as 7:1. 30 31 Applications The MA4ST550 series is appropriate for use in VCOs with frequencies within the range of approximately 1-14 GHz where a large capacitance change is required. These diodes are suited for VCOs in missile seekers, telecommunication systems and electronic warfare systems with critical post tuning drift specifications. 134 Environmental Performance All tuning varactors in ceramic packages are capable of meeting the performance tests dictated by the methods and procedures of the latest revisions of MIL-S-19500, MILSTD-202 and MIL-STD-750 which specify mechanical, electrical, thermal and other environmental tests common to semiconductor products. Absolute Maximum Ratings at 25°C Parameter Absolute Maximum Reverse Voltage Same as Breakdown Voltage Operating Temperature - 65°C to +150°C Storage Temperature - 65°C to +200°C Temperature Coefficient 400 ppm/°C at -4 Volts 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 (03) 3226-1671 Fax +81 (03) 3226-1451 ■ Europe: Tel. +44 (1344) 869 595 Fax +44 (1344) 300 020 High Q Hyperabrupt Tuning Varactors MA4ST550 Series V3.00 Electrical Specifications at 25°C Breakdown Voltage = 22 Volts Minimum @ 10 Microamps Reverse Current = 50 nAmps Maximum @ 20 Volts and 25°C Case Style Total Capacitance2,3 @ - 4V (pF) Min./Max. Total Capacitance2,3 @ - 20V (pF) Min./Max. Typical @ - 4 Volts 50 MHz MA4ST551 30 0.72-0.88 0.30-0.38 650 MA4ST552 30 0.90-1.10 0.34-0.42 650 MA4ST553 30 1.08-1.32 0.38-0.48 600 MA4ST554 30 1.35-1.65 0.43-0.58 600 MA4ST555 30 1.62-1.98 0.51-0.68 550 MA4ST556 30 1.98-2.42 0.58-0.78 550 MA4ST557 30 2.43-2.97 0.68-0.88 500 MA4ST558 30 2.97-3.63 0.82-1.02 500 MA4ST559 30 3.51-4.29 0.93-1.18 450 MA4ST560 30 4.23-5.16 1.13-1.43 450 MA4ST561 30 5.04-6.16 1.33-1.63 450 MA4ST562 30 6.12-7.48 1.58-1.98 400 MA4ST563 30 7.38-9.02 1.88-2.38 400 1 Model Number Notes: 1. The standard case style is 30. Other packages and chips shown at the bottom of this page are available. When ordering, specify the desired case style by adding the case designation as a suffix to the model number, i.e. MA4ST552-134 is a 15 X 15 mil chip diode. See appendix for complete dimensions. 2. Capacitance is measured at 1 MHz. 3. The total capacitance values shown are for devices housed in case style 30. Other case styles will result in different values due to different case parsasitics. Case parasitics (CP and LS) are given for available case styles along with the outline drawings in the appendix. Case Styles 30 31 94 1056 120 134 1088 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 (03) 3226-1671 Fax +81 (03) 3226-1451 ■ Europe: Tel. +44 (1344) 869 595 Fax +44 (1344) 300 020 High Q Hyperabrupt Tuning Varactors MA4ST550 Series V3.00 Typical Performance Curves CAPACITANCE vs REVERSE BIAS VOLTAGE (CASE STYLE 30) CAPACITANCE vs REVERSE BIAS VOLTAGE (CHIPS) 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 (03) 3226-1671 Fax +81 (03) 3226-1451 ■ Europe: Tel. +44 (1344) 869 595 Fax +44 (1344) 300 020