D38999/26WJ35PN Amphenol, D38999/26WJ35PN Datasheet - Page 204

• Manufacturer Part Number: D38999/26WJ35PN
• Description: Circular MIL / Spec Connectors 128P SIZE 25 STRAIGHT PLUG PIN
• Manufacturer: Amphenol
• Series: 38999 Seriesr

Specifications of D38999/26WJ35PN

• Mil Type: MIL-DTL-38999 III
• Product Type: Connectors
• Contact Style: Pin (Male)
• Shell Style: Plug
• Shell Size: 25
• Number Of Contacts: 128
• Insert Arrangement: 25-35
• Mating Style: Threaded
• Mounting Style: Cable
• Termination Style: Crimp
• Shell Plating: Cadmium over Aluminum
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Electrostatic Discharge (ESD)
Protected Connectors
Amphenol has developed cylindrical and rectangular connec-
tors which protect sensitive components from Electrostatic
Discharge (ESD) without diodes, varistors, gas tubes, or
“experimental” semiconductive materials.
These connectors utilize the Faraday Cage principal to shunt electrostatic
discharge events to the conductive enclosure on which the connector is
mounted, thus never allowing the high voltage, high current discharge event
to reside on any contacts.
The ESD protected connectors have the same physical envelope as their
standard counterparts, and do not require special mounting or terminating
techniques. All of the contacts remain fully functional, and electrical charac-
teristics such as capacitance are not effected.
Product Features:
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What is Electrostatic Discharge (ESD)?
Electrostatic Discharge (ESD)
charge from one body to another. A static electric charge consists of either a
surplus or depletion of electrons on a body, which gives that body a potential
or voltage relative to ground (or another body).The discharge is extremely fast
(less than 1 nanosecond risetime) and the current flow may exceed 100
amps!
Static electricity is normally the result of two materials transferring charges
when rubbed or separated, such as shoes scuffing across a dry carpet, or
sheets of untreated plastic being separated. This phenomena is commonly
referred to as the triboelectric effect.
The voltage developed due to the
materials involved, the quantity and type of contact, and relative humidity. In a
dry environment a person can accumulate a charge of up to 25 KV! In a moist
environment a person’s potential is reduced due to the effect of moisture on
the insulating properties of materials.
For further information see:
Amphenol Product Data Sheet #171-1 Amphenol Electrostatis
Discharge (ESD) Protected Connectors.
Amphenol Publication L-2075, “ESD Attenuation Test Procedure for
Connectors with Faraday Cage Protective Structures”
* For further information on Amphenol LRM connectors with ESD
protection consult Amphenol Aerospace, Sidney, NY.
Connector envelope identical to unprotected design for most
applications
Exceeds protection requirements of IEC 801-2 and MIL-STD-1686:
Ensures that all components within a conductive enclosure will be
subjected to a maximum of 10V during electrostatic discharges between
–26 KV and +26 KV
Voltage observed on contacts during ESD events –
Current observed on contacts during ESD events –
Response time – instantaneous
(voltage and current are maximum values)
Maximum ESD voltage – tested to ±26KV
No capacitive loading
Eliminates the need for discrete components (such as diodes) and
maximizes printed circuit board real estate for equipment housed in
conductive enclosures which require ESD protection as free-standing
units
Operating voltage of connectors not effected for most designs
Pulse life – infinite
<10V (at 1 megohm)
<100 milliamperes (at 2 ohms)
Contact Amphenol Aerospace for more information 800-678-0141 • www.amphenol-aerospace.com
triboelectric effect
is the rapid transfer of a static electric
depends on the
What is a Faraday Cage?
A Faraday cage
such as a sheet–metal enclosure, or it may be full of apertures,
such as a wire cloth box. When a charge is placed on a faraday
cage the electrons which make up the charge, having like polarity,
try to position themselves as far as possible from each other. This
places the electrons on the outer surface of the enclosure, leaving
the inner surface uncharged. The charge on the outer surface
does not induce a charge on any neutral object inside of the fara-
day cage, and therefore does not try to transfer itself onto the in-
ternal object. Neutral objects (such as IC’s) inside of a faraday
cage are thereby protected from ESD activity external to the fara-
day cage.
The voltage and current observed on neutral objects within a fara-
day cage during ESD events are due to the secondary effects of
ESD.These include Electromagnetic Interference (EMI), magnetic
and electrical field coupling. The faraday cage of the Amphenol
ESD Protected Connectors has been designed to minimize these
effects.
The Amphenol
The Amphenol
at the mating interface. The faraday cage has been specifically
designed to intercept electrostatic discharges from the contacts in
the unmated state, while maintaining each contact’s isolation
when the connector is mated. When the ESD Protected Connec-
tors have been mounted to a conductive enclosure, a faraday cage
is created which will protect components located within the enclo-
sure from electrostatic discharges. This eliminates the need for
discrete components such as diodes and gas discharge tubes,
and saves printed circuit board real estate. Amphenol ESD Pro-
tected Connectors have also been applied to Line Replaceable
Modules (LRM).*
Shell Size & Insert Arrangements are together in one chart.
First number represents Shell Size, second number is
the Insert Arrangement.
Filter Cylindrical Connector (Actual Photo)
ESD Testing on MIL-DTL-38999, Series III
®
ESD Protected Connectors have a faraday cage
is a conductive enclosure. It may be solid in form
®
ESD Protected Connectors
Amphenol
Aerospace
203