M A COM MA4ST083-T-R, MA4ST083, MA4ST0822CK, MA4ST0821CK, MA4ST0820CK Datasheet

Surface Mount Hyperabrupt
Wide-Band Tuning Varactors

MA4ST079 thru 083

V3.00

M/A-COM, Inc.

North America: Tel. [phone] ■ Asia/Pacific: Tel. [phone] ■ Europe: Tel. [phone]

Fax [phone] Fax [phone] Fax [phone]

1

Specifications Subject to Change Without Notice.

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.

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.

SOT-23

Configurations

TOP VIEW

(SINGLE)

(COMMON CATHODE PAIR)

Surface Mount Hyperabrupt Wide-Band Tuning Varactors MA4ST079 thru 083

V3.00

M/A-COM, Inc.

North America: Tel. [phone] ■ Asia/Pacific: Tel. [phone] ■ Europe: Tel. [phone]

Fax [phone] Fax [phone] Fax [phone]

2

Specifications Subject to Change Without Notice.

Electrical Specifications @ 25°C

Breakdown Voltage @ IR= 10 µA, VB = 12 Volts Minimum
Reverse Leakage Current @ V

R

= 10 Volts, IR= 100 nA Maximum

Temperature Coefficient ot Capacitance @ V

R

= 8 Volts, TCC = 400 ppm/°C Typical

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

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 50 mW @ 25°C

Minimum Maximum Maximum Typical
Model Total Capacitance Total Capacitance Total Capacitance Total Capacitance Total Capacitance Typical
Number (pF) (pF) (pF) (pF) Ratio CT1/C

T8

Q

f = 1 MHz f = 1 MHz f = 1 MHz f = 1 MHz f = 1 MHz f = 50 MHz

VR = 1 Volt VR = 2.5 Volts VR = 4 Volts VR= 8 Volts VR = 1/ VR=8 VR= 4 Volts

min. max.

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