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High Q Hyperabrupt Tuning Varactors
Features
q q q
MA4ST550 Series
V3.00
Case Styles
q
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 25C
Parameter Reverse Voltage Operating Temperature Storage Temperature Temperature Coefficient Absolute Maximum Same as Breakdown Voltage - 65C to +150C - 65C to +200C 400 ppm/C at -4 Volts
Specifications Subject to Change Without Notice.
M/A-COM, Inc.
North America: Tel. (800) 366-2266 Fax (800) 618-8883
s
1
Asia/Pacific: Tel. +81 (03) 3226-1671 Fax +81 (03) 3226-1451
s
Europe: Tel. +44 (1344) 869 595 Fax +44 (1344) 300 020
High Q Hyperabrupt Tuning Varactors Electrical Specifications at 25C
Breakdown Voltage = 22 Volts Minimum @ 10 Microamps Reverse Current = 50 nAmps Maximum @ 20 Volts and 25C
Model Number MA4ST551 MA4ST552 MA4ST553 MA4ST554 MA4ST555 MA4ST556 MA4ST557 MA4ST558 MA4ST559 MA4ST560 MA4ST561 MA4ST562 MA4ST563 Case Style 30 30 30 30 30 30 30 30 30 30 30 30 30
1
MA4ST550 Series
V3.00
Total Capacitance2,3 @ - 4V (pF) Min./Max. 0.72-0.88 0.90-1.10 1.08-1.32 1.35-1.65 1.62-1.98 1.98-2.42 2.43-2.97 2.97-3.63 3.51-4.29 4.23-5.16 5.04-6.16 6.12-7.48 7.38-9.02
Total Capacitance2,3 @ - 20V (pF) Min./Max. 0.30-0.38 0.34-0.42 0.38-0.48 0.43-0.58 0.51-0.68 0.58-0.78 0.68-0.88 0.82-1.02 0.93-1.18 1.13-1.43 1.33-1.63 1.58-1.98 1.88-2.38
Typical @ - 4 Volts 50 MHz 650 650 600 600 550 550 500 500 450 450 450 400 400
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
120
134
1056
1088
Specifications Subject to Change Without Notice.
2
North America: Tel. (800) 366-2266 Fax (800) 618-8883
s
M/A-COM, Inc.
Asia/Pacific: Tel. +81 (03) 3226-1671 Fax +81 (03) 3226-1451
s
Europe: Tel. +44 (1344) 869 595 Fax +44 (1344) 300 020
High Q Hyperabrupt Tuning Varactors Typical Performance Curves
MA4ST550 Series
V3.00
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: Tel. (800) 366-2266 Fax (800) 618-8883
s
3
Asia/Pacific: Tel. +81 (03) 3226-1671 Fax +81 (03) 3226-1451
s
Europe: Tel. +44 (1344) 869 595 Fax +44 (1344) 300 020

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