ZERO LENGTH SHIELD
TERMINATION BACKSHELLS
FOR RUGGED EMI/ RFI APPLICATIONS
DECEMBER 2012
S TA RSH I ELD ™
WHAT IS STARSHIELD™
“ZERO LENGTH SHIELD
TERMINATION?”
For decades, bundles of individually shielded cables have been used to solve many
electrical system design issues from cross-talk to wire-routing/management and
maintenance. These individual shields were frequently “pigtailed” by pulling
the center conductors through the outer shield, or by soldering drain-
wires to the shield, then terminating these pigtails or drain wires via a
terminal lug to the cable-clamp on the back of the connector.
Pigtails or drain wires, suffer from several shortcomings.
First, they force shield current to flow in an asymmetrical
manner yielding higher transfer impedances. Second,
and perhaps more importantly, the pigtail or drain-wire
itself creates a “loop in the shield” or “standing antenna”
effect. Coupled with the exposed lengths of unshielded
wires, this condition acts as a receptor and/or radiator
of noise. EMC performance will drop to unacceptable
levels at higher frequencies dependent on the
length of the pigtail. Over the years, more elegant
methods of terminating pigtails or drain-wires have
been developed that effectively shorten these lengths,
however the underlying issue still exists—particularly
in higher-bandwidth and less noise-tolerant applications
which demand ever-shorter pigtail lengths for acceptable
performance.
The best connection is one in which the individual shields are
extended up to and make solid 360° connections to the backshell
leaving no length of unshielded wires exposed outside of the ground
plane. Effectively, this reduces the length of the pigtails or drain-wires to
zero, and eliminates the standing antenna. Said another way, Zero Length Shield
Termination may be achieved via a 360° termination of signal group shields (the
individual shields over the wires or twisted pairs in a bundle) to an encapsulating
ground in which no pigtails or drain wires are necessary to terminate the shields to
the connector body or backshell.
Glenair’s StarShield “Zero Length Shield Termination” backshell methodology
excludes pigtails or drain-wires altogether by providing termination platforms
referred to as “ferrules” which allow individual shields to be terminated by a 360°
solder connection in one easy process. The ferrules in-turn lock into a “star” that
provide another 360° termination to the encapsulating ground plane of the backshell
body. By eliminating the issues associated with pigtails or drain-wires, this system
not only offers the highest level of EMC performance, but is also one of the most
reliable, repairable individual shield termination methods on the market today.
GLENAIR, INC. • 1211 Air Way • Glendale, CA 91201-2497 • Tel: 818-247-6000 • Email: sales@glenair.com • www.glenair.com
StarShield™ Termination Backshells
Table of Contents
Introduction to the StarShield™ Shield Termination Backshell
A-2
A-3
A-4
Specifications
How to Order
StarShield™ Assembly Procedure
StarShield™ Shield Termination Backshells
B-1
B-2
B-6
B-10
B-34
B-38
B-42
B-44
StarShield™ Backshell General Information
on the StarShield™ shield termination backshell
StarShield™ EMI/RFI Shield Termination Backshell
for MIL-DTL-83723 Series I & III, 5015 MS400 Series, AS81703 Series 3, and MIL-C- 26482 Series 2 connectors
StarShield™ EMI/RFI Shield Termination Backshell
for MIL-DTL-38999 Series I and II connectors
StarShield™ EMI/RFI Shield Termination Backshell
Designator for MIL-DTL-38999 Series III & IV connectors
StarShield™ Direct Coupling EMI/RFI Shield Termination Backshell
for Series 800 Mighty Mouse™ connectors
StarShield™ EMI/RFI Shield Termination Backshell
for size 2 ARINC 600 Series connectors
StarShield™ EMI/RFI Shield Termination Backshell
for Collins SGA3 connectors
StarShield™ EMI/RFI Shield Termination Backshell
for D-Subminiature connectors
StarShield™ Components
C-2
C-2
C-4
C-5
C-6
C-7
C-8
C-9
C-10
C-11
General Information
StarShield™ “Star”
Ferrule and Heat Shrink Terminator Device Kit
Ferrule and Sealing Device Kit
Mighty Mouse Termination Kit
Heat Shrink Termination Flex Device
Shield Flex Braid Temination Kit
StarShield™ Standard or Dummy Ferrule
SolderShield Device
Ferrule
Supplemental Product Information
D-1
D-4
D-10
D-14
D-12
Series 77 Shrink Boots
AmberStrand
®
and ArmorLite™ Braid
Finishes
About Composite Materials
Backshell Assembly Tools
Dimensions in inches (millimeters) and are subject to change without notice.
StarShield™ Zero Length Shield Termination Catalog
CAGE Code 06324
© 2012 Glenair, Inc.
Printed in U.S.A.
GLENAIR, INC. • 1211 AIR WAY • GLENDALE, CA 91201-2497 • 818-247-6000 • FAX 818-500-9912
www.glenair.com
A-1
E-Mail: sales@glenair.com
Introduction to
StarShield™
A
B
C
D
Introduction to
StarShield™
Introduction to StarShield™
Shield Termination Backshells
Product Features
A
The unique StarShield™ configuration completely eliminates
“standing antenna” problems common with pigtail shield
termination systems.
The backshell utilizes familiar heat shrink termination
(HST) sleeve technology for fast and reliable termination of
shielding—even with dissimilar wire types and gauges.
The StarShield™ system is available in a standard
configuration featuring a threaded compression nut and a
tapered split-ring that fits snugly into a conical backshell or a
lightweight split banding version.
Available fittings include EMI shield termination and shrink-
boot backshells.
TM
The Glenair Series 470-013 StarShield™ “Zero Length” Individual Shield Termination Backshell offers optimal grounding
of EMI/EMP braided shielding. The unique StarShield™ configuration completely eliminates the need for the termination
of additional shield drain wires or pigtails. The backshell utilizes familiar solder sleeve technology for fast and reliable
termination of shielding—even with dissimilar wire types and gauges. The internal configuration of the StarShield™
features a tapered split-ring that fits snuggly into the conically machined backshell. Tightening the coupling nut in place
effects 360° grounding of all conductive surfaces. Standard designs include banding and shrink-boot versions.
Test Description
Magnetic Permeability
DC resistance
Durability
“Zero Length” Individual Shield Termination Backshells
StarShield™ Performance Requirements
Relative permeability less than 2.0 for aluminum and 5.0 for stainless steel.
Resistance was measured between connector/fixture, and ferrule or a point near the end of the cable shield. Cable shield resistance was
subtracted when measuring to a point near the end of the cable shield. The DC resistance did not exceed 5 milliohms after conditioning.
Backshells subjected to 10 cycles of assembly and disassembly (not including HST device). Showed no evidence of damage detrimental
to performance.
Condition IV, 5 cycles, except steps 2 and 4 were 2 minutes maximum duration. The temperature of step 1 was -65°C and temperature of
step 3 was +200°C for nickel-plated Backshells with nickel-plated copper braids, +175°C for cadmium plated Backshells or silver-plated
braids, or +150°C for tin-plated copper braids. After conditioning, Backshells met the subsequent performance requirements and
showed no evidence of damage detrimental to performance.
Backshells were subjected to maximum operating temperatures for a period of 1,000 hours. After conditioning, Backshells met the
subsequent performance requirements and showed no evidence of damage detrimental to performance.
After testing, backshell showed no evidence of damage detrimental to performance.
Backshell was torqued to a suitable test fixture representative of an actual connector. Cable bundle was clamped or otherwise
secured at 10.0 +/-.5 inches from the test fixture. After testing, Backshell showed no evidence of loosening or damage detrimental
to performance with no discontinuities >1g5.
The pulse was approximate half sine wave of 300 G ± 15 percent magnitude with duration of 3 ± 1 milliseconds. The wire bundle was
clamped or otherwise secured at 10.0 +/-.5 inches from the test fixture. After testing, Backshell showed no evidence of loosening or
damage detrimental to performance with no discontinuities >1g5.
After testing, backshell showed no evidence of loosening or damage detrimental to performance.
A minimum of one ferrule per backshell was tested and wired with 4 shielded twisted pairs. DC resistance was monitored during the
test. DC resistance during the test did not exceed 7 milliohms.
The samples were suspended from the top of the chamber using waxed twine or string, glass rods or glass cord. StarShield™ backshells
showed no signs of basis metal exposure which may affect performance as defined in AIR4789
One sample per fluid. StarShield™ backshell and HST devices showed no signs of swelling, cracking or other evidence of damage
detrimental to performance.
One representative medium size StarShield™ backshell was fitted to a brass or copper fixture, wired with copper tubes and tested in
accordance with VG95373-41. Shielding effectiveness was greater than 98 dB at 30 MHz and 90 dB at 100 MHz
Dimensions in inches (millimeters) and are subject to change without notice.
StarShield™ Zero Length Shield Termination Catalog
CAGE Code 06324
Procedure
EIA-364.54
EIA-364.6
GPS470013
EIA-364.32, condition IV
and GPS470013
GPS470013
SAE AS85049 category 3A
EIA-364.28
Condition VI, letter J
8 hrs/axis, monitored
EIA-364.27
AS85049, category 3A (heavy duty)
EIA364.38, condition E (25lbs)
EIA364.26 test condition letter A
(96hrs) and test condition letter C
(500hrs)
EIA-364.10
VG95373-41
Temperature Cycling
Temperature Aging
Coupling Thread Strength
Vibration
Shock
Bending Moment
Cable Pull-out
Salt-Spray (Corrosion)
Fluid Immersion
Shielding effectiveness
© 2012 Glenair, Inc.
Printed in U.S.A.
GLENAIR, INC. • 1211 AIR WAY • GLENDALE, CA 91201-2497 • 818-247-6000 • FAX 818-500-9912
www.glenair.com
A-2
E-Mail: sales@glenair.com
StarShield™ Shield Termination Backshells
How To Order
How to Order StarShield™ Shield Termination Backshells
Option
B
- Banding Nut with Band
C
- Conduit Backshell
G
- Gland Nut
T
- Tinel Nut with Tinel Ring
for Single Braid
Product Series
470
- StarShield™
Connector
Designator
Basic
Number
Order
Number
Ferrule
Quantity
Code
470
A
S
013
NF
16
6
G
DS
-
T
Star Option
DS
- Drilled Star
(Omit if Not Required)
Shrink Boot Option
T
- Standard Shrink Boot
H
- Zero Halogen Shrink Boot
(Omit If Not Required)
(See Table III)
Angular Function
S
- Straight
H
- 45°
J
- 90°
Finish Symbol
M
- Electroless Nickel
NF
- Cadmium/O.D. Over Electroless
Nickel (1000hr Salt Spray)
Z1
- Stainless Steel/Passivate
ZM
- Stainless Steel/Electroless Nickel
ZR
- Aluminum/Zinc-Nickel, Black
Connector Designator Table
A
Connector
Specification
MIL-DTL-5015
MIL-DTL-26482
MIL-C-81703
MILL-DTL-83723
40M39569
CECC 7521.001
DEF 5326-3
EN 2997
EN 3646
ESC 10
ESC 11
LN 29504
NFC 93422
PAN 6432-1
PAN 6432-2
PATT 602
Series
MS3400
2
3
I & III
Connector
Specification
MIL-DTL-38999
30M38277
NFC93422
NFC93422
PAN6433-1
PATT 641
PATT 616
* See Note Below
F
Series
I & II
HE308
HE309
Connector
Specification
MIL-DTL-38999
EN3645
CECC75201.002
H
Series
III & IV
HE302
* Caution: these connector interfaces are not suitable for total environmental sealing; for further information consult factory.
Consult factory for connector types not listed
Dimensions in inches (millimeters) and are subject to change without notice.
StarShield™ Zero Length Shield Termination Catalog
CAGE Code 06324
© 2012 Glenair, Inc.
Printed in U.S.A.
GLENAIR, INC. • 1211 AIR WAY • GLENDALE, CA 91201-2497 • 818-247-6000 • FAX 818-500-9912
www.glenair.com
A-3
E-Mail: sales@glenair.com
Introduction to
StarShield™
A
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