200840A.pdf

aPPLICATION NOTE
Handling Precautions for Schottky Barrier Mixer
and Detector Diodes
Damage by Burnout from Static Electricity
Source of Static Electricity
Precautions
Operator discharging charge on self through diode
Use metal or conductive plastic bench tops and chair seats. Ground operator with
strap or use static eliminators, radioactive or ionized air type. Instruct operator in
handling precautions.
Use of snow (expanded polystyrene) to hold diodes
Don’t use.
Use of plastic bags
Only use dissipative bags or containers. Do not use non-dissipative plastic bags
Cold dry weather (resulting in low humidity) will increase the likelihood of static burnout.
Damage by Burnout on Test Kits
Source of Transient
Precautions
Bias circuit voltage transient
Have low voltage supply—not high voltage with dropping resistor. Do not use high
value capacitance in voltage network. Bring bias voltage to zero before inserting diode.
Bias voltage wrong polarity
Use polarized plugs and supplies.
Transients in power supplies
Use regulated power supply shunting diodes.
Coupled voltage from other circuits
Use shielded leads to diodes. Avoid common wire harness for diode leads
and high voltage circuits.
Charge in cables while connecting to circuit
Design checkout procedure and circuits to avoid this.
Ground loops
Have all connecting cables touch outside connections first.
High resistance scale ohmmeter
Maximum open circuit voltage should be 1.5 V. Use appropriate circuit or ohmmeter.
It is extremely important in all diode testing that the test equipment, test jig, and test fixtures be all connected and at the same electrical potential before the diode is inserted.
Damage by Burnout by Microwave Energy
Source of Microwave Power
Precautions
Pulse energy from same system
Use TR tubes in good condition. Use solid state limiters as well as TR tubes.
Pulse energy from other systems
Use shutter tubes when system not working.
High rectified voltage
Restrict dynamic range of signal or limit load resistor size.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
200840 Rev. A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • January 28, 2008
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APPLICATION NOTE • Handling Precautions for Schottky Barrier Mixer and Detector Diodes
Damage by Burnout During Electronic Assembly and Test
Source of Burnout Energy
Precautions
Leakage current from welding equipment and soldering irons
Ground equipment if possible. Test for leakage current and ground loops.
Pulse voltages from controllers and relays on ovens, environmental
test equipment, etc.
Put capacitors across relays. Shield equipment. Shield diodes.
Pickup of RF energy from sources such as induction heaters,
high power transmitters.
Shield and ground transmitters. Keep diodes in shielded containers.
Keep diode and plumbing subassemblies shielded.
Accumulated charge on handling or assembly equipment
Use adequate grounding on all assembly and handlers
Damage by Mechanical Shock
Source of Shock
Precautions
Handling
Don’t drop diodes or packages on bench or floor. Don’t shake in packages.
Insertion in equipment
Diodes should not seat with a jerk or snap. Adjust mechanical tolerances
for smooth insertion.
Cutting and forming leads
Support diode during operation. Have cutting and forming tools work smoothly.
Damage by Excessive Heat
Source of Heat
Soldering
Precautions
Use heat sink between diode body and point of soldering heat application.
Keep exposure to heat at a minimum.
Detection of Damage
Test
Precautions
DC reverse test—3 V reverse
Low resistance indicates burnout of some type.
DC forward test
High resistance indicates mechanical or thermal damages.
General Precautions
Mark packages containing diodes with cautionary notices.
(Upon request, Skyworks will supply diode packaging with such
notation.)
Post instructions at locations where diodes are handled (such as
incoming inspection, test stations, etc.).
Instruct inspectors and test operators as to precautions required.
It is extremely important in all microwave diode testing that the
test equipment, test fixtures, diode holders, etc., all be connected
together and at the same potential before the diode is inserted
into the diode holder.
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Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
January 28, 2008 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • 200840 Rev. A
APPLICATION NOTE • Handling Precautions for Schottky Barrier Mixer and Detector Diodes
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Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
200840 Rev. A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • January 28, 2008
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