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Visit www.macomtech.com for additional data sheets and product information.

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changes to the product(s) or information contained herein without notice.

1

Surface Mount Hyperabrupt Varactors

Rev. V5

MA4ST400 Series

ADVANCED: Data Sheets contain information regarding a product M/A-COM Technology Solutions

is considering for development. Performance is based on target specifications, simulated results,

and/or prototype measurements. Commitment to develop is not guaranteed.

PRELIMINARY: Data Sheets contain information regarding a product M/A-COM Technology

Solutions has under development. Performance is based on engineering tests. Specifications are

typical. Mechanical outline has been fixed. Engineering samples and/or test data may be available.

Commitment to produce in volume is not guaranteed.

Features

• Surface Mount Packages

• High Quality Factor

• Capacitance Ratio to 9.5:1

• Tape and Reel Packaging Available

• SPC Monitored Ion Implantation for Excellent

• C-V Repeatability

• Singles and Common Cathode Pairs

• Lead-Free (RoHS Compliant) Equivalents

Available with 260 °C Reflow Compatibility

Description

M/A-COM’s MA4ST400 series are ion-implanted,

hyperabrupt junction, silicon tuning varactors in the

SOT-23 surface mount package. These thermal

oxide passivated diodes feature high capacitance

ratio and quality factor. They are well suited for

octave bandwidth tuning in the HF to UHF frequency

bands. The standard capacitance tolerance is ±

10%, with tighter tolerances available. Capacitance

matching at one or more bias voltages is also

available. These diodes are offered with standard

Sn/Pb plating, as well as with 100% matte Sn plating

on our RoHS compliant devices.

Applications

The MA4ST400 series tuning varactors are useful

for octave bandwidth tuning applications in the HF

through UHF ranges. Applications include VCOs and

voltage tuned filters in radios, cable TV tuners and

test instruments where low cost and excellent lot-to-

lot

repeatability

are

critical.

Linear

tuning

performance is available from 3 to 8 volts.

Absolute Maximum Ratings

1,2

1. Operation of this device above any one of these parameters

may cause permanent damage.

2. Please refer to application note M538 for surface mounting

instructions

Parameter

Absolute Maximum

Reverse Voltage

22V

Forward Current

50 mA

Operating Temperature

-55 °C to +125 °C

Storage Temperature

-55 °C to +125 °C

Total Power Dissipation

250 mW

Part Number

RoHs Compliant

Part Number

Configura-

tion

MA4ST401-287T

MAVR-000401-0287AT

Single

MA4ST403-287T

MAVR-000403-0287AT

Single

MA4ST404-287T

MAVR-000404-0287AT

Single

MA4ST405-287T

MAVR-000405-0287AT

Single

MA4ST406-287T

MAVR-000406-0287AT

Single

MA4ST407-287T

MAVR-000407-0287AT

Single

MA4ST408-287T

MAVR-000408-0287AT

Single

MA4ST409-287T

MAVR-000409-0287AT

Single

MA4ST401CK-287T

MAVR-000401-0287FT

Common

Cathode

MA4ST403CK-287T

MAVR-000403-0287FT

Common

Cathode

MA4ST404CK-287T

MAVR-000404-0287FT

Common

Cathode

MA4ST405CK-287T

MAVR-000405-0287FT

Common

Cathode

MA4ST406CK-287T

MAVR-000406-0287FT

Common

Cathode

MA4ST407CK-287T

MAVR-000407-0287FT

Common

Cathode

MA4ST408CK-287T

MAVR-000408-0287FT

Common

Cathode

MA4ST409CK-287T

MAVR-000409-0287FT

Common

Cathode

RoHS Compliant Parts

3

3. Suffix refers to package style, configuration and packaging

requirements. Other packages and configurations may be

available upon request.

Configurations

Common Cathode

Single