G125 COMPONENT SPECIFICATION
C12510
G125 Series: 1.25mm Pitch High Reliability Connectors
Component Specification
June 2020
Contents
1. Description of Connector ....................................................................................................................................................2
2. Ratings .................................................................................................................................................................................2
2.1. Materials ......................................................................................................................................................................2
2.2. Electrical Characteristics .............................................................................................................................................2
2.3. Mechanical Characteristics .........................................................................................................................................3
2.4. Environmental Characteristics ...................................................................................................................................3
2.5 Wire Termination information – Signal crimp products ...........................................................................................3
2.6 Wire Termination information – Power crimp products ......................................................................................... 4
Appendix 1 ...............................................................................................................................................................................5
Appendix 1.1. – Gecko-SL Contact numbering .................................................................................................................5
Appendix 1.2. – Gecko with Latches Contact numbering ...............................................................................................5
Appendix 1.3. – Gecko-MT Part Numbering .................................................................................................................... 6
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C12510
Issue: 10
C/Note: 30051 Date: 08.06.20
G125 COMPONENT SPECIFICATION
C12510
1. DESCRIPTION OF CONNECTOR
The G125 series of connectors (branded “Gecko”) comprises of: barrel crimp contacts and crimp housings
available in Male and Female genders; Vertical and Horizontal PC-Tail Connectors and Vertical Surface Mount
Connectors; all on a 1.25mm pitch. Connectors are fully shrouded, unsealed connectors for interconnecting
cable-to-cable, cable-to-board and board-to-board applications.
The Gecko Crimp variants are fully shrouded, unsealed connectors with replaceable contacts. They are
designed for interconnecting cable-to-cable and cable-to-board. The housings have a low profile potting wall
to allow back potting for additional strain relief and improved sealing where required. All pre-made cable
assemblies are supplied back-potted for customer convenience, and individually crimped contacts are also
available.
There are three variants of the range, the ranges are not intermateable:
• Gecko-SL – Screw-Lok version. Female connectors have floating screws for secure, robust
interconnection to the male counterpart. Male Screw-Loks can also have board-mount studs for
secure PCB connection.
• Gecko with Latches (original design). Male variants can be equipped with locking latches for secure
interconnection with easy to release features. Latches can be specified with through board locking
features or surface mount pads for additional security.
• Gecko-MT. Connectors are equipped with both signal and power contacts and are available in
crimped or through-board configurations. Screw-Lok technology is used to secure the connectors,
and board-mount studs for PCB fastening are available.
All contacts are gold plated all over for high performance and long service life; the contact plating is hard
acid gold of 98% purity.
The Gecko-SL and latched ranges cover 06, 10, 12, 16, 20, 26, 34 and 50 total number of contacts in a dual
row configuration. Connector housings are polarised to prevent mis-matching and have contact position one
indicated on the outside of the housings. Metal backshells are available for sizes 06, 10, 12 and 16 cable
variants in the Gecko-SL range, to provide mechanical, RF and EMC protection. Gecko-MT connectors are
available in ’01-08-01’ and ’02-08-02’ configurations, with 2 power contacts and 8 signal contacts or 4 power
contacts and 8 signal contacts respectively.
2. RATINGS
2.1. MATERIALS
All materials are also listed on individual drawings.
All Power Contacts ..................................................................... Beryllium Copper
All Female Signal Contacts ......................................................... Beryllium Copper
Male PCB Signal contacts ........................................................... Phosphor Bronze
Male Crimp Signal Contacts........................................................ Brass
Contact plating finish ................................................................. Hard Gold over Nickel
Housing ....................................................................................... 30% Glass Filled Thermoplastic UL94 V-0
Latches ........................................................................................ Copper-Nickel-Tin alloy, Tin over Nickel
finish
Screw-Lok fixings ....................................................................... Stainless Steel
Metal Backshells ......................................................................... Aluminium 6061-T6, High Phosphous
Nickel finish
Potting Compound ...................................................................... Stycast 2651MM with Catalyst 9
2.2. ELECTRICAL CHARACTERISTICS
EIA-364-70A: 1998 – Current – per individual signal contact, 25°C ambient .................. 2.8A max
(When only one contact per connector is electrically loaded)
EIA-364-70A:1998 – Current – per track for Flex Circuits, 25°C ambient…………………….0.4A max
EIA-364-70A: 1998 – Current – per signal contact through all contacts, 25°C amb........ 2.0A max
EIA-364-70A: 1998 – Current – per power contact through all contacts ......................... 10.0A max
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C12510
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C/Note: 30051 Date: 08.06.20
G125 COMPONENT SPECIFICATION
C12510
2.2. ELECTRICAL CHARACTERISTICS (CONT.)
EIA-364-20C: 2004 – Voltage Proof (at 1013mbar, sea level) .............................. 600V DC or AC peak
EIA-364-20C: 2004 – Voltage Proof (at 44mbar, 21,336m/70,000ft) ................... 350V DC or AC peak
Working Voltage (at 44mbar, 21,336m/70,000ft)…………………………. .................. 250V DC or AC peak
Working Voltage (at 1006mbar, sea level)………………………………. ....................... 450V DC or AC peak
EIA-364-06C: 2006 – Contact Resistance (initial) ................................................. 20mΩ max
EIA-364-06C: 2006 – Contact Resistance (after conditioning) ............................. 25mΩ max
EIA-364-21C: 2000 – Insulation Resistance (initial) .............................................. 10GΩ min at 500V DC
EIA-364-21C: 2000 – Insulation Resistance (after conditioning*) ........................ >1GΩ min at 500V DC
Creepage Distance (contact-to-contact) ................................................................ 0.15mm min
Clearance Distance (contact-to-contact) ............................................................... 0.15mm min
*excluding Salt Mist conditioning
2.3. ENVIRONMENTAL CHARACTERISTICS
EIA-364-31B: 2000 - Humidity ................................................... 65/150/56 days at 93% RH
EIA-364-32C: 2000 – Temperature Range ................................. Test Condition IV, Dwell 30mins, 5 cycles
at -65°C to +150°C
EIA-364-17B: 1999 – Temperature Life ...................................... Test Condition X, 150°C±5°C, Method A,
without load
EIA-364-26B: 1999 – Salt Mist .................................................. Test Condition B, 48 hours continuous
exposure
EIA-364-28D: 1999 – Vibration Severity ◊● .............................. Test Condition IV: 10Hz to 2000Hz,1.5mm,
198m/s² (20G) Duration = 2 Hours
EIA-364-27B: 1996 – Shock Severity ◊● ............................... Test Condition E: 981m/s² (100G) for 6ms
in Z axis, 490m/s² (50G) for 11ms in X & Y
axes
Bump Severity ◊......................................................................... 390m/s² (40G), 4,000±10 Bumps
EIA-364-01A: 2000 – Acceleration Severity .............................. 490m/s² (50G)
◊ Latches or Screw-Loks fully utilized
X&Y tested at lower levels due to shaker limitations
● It is recommended that back-potting compound is applied to crimp assemblies for vibration at
higher frequencies
2.4. MECHANICAL CHARACTERISTICS
Durability................................................................................................................. 1000 operations
Durability (Latches) ................................................................................................ 100 operations
By hand or with Z125-926XX00 tools. Minimum added retention of 20N
Screw-Lok Torque ................................................................................................... 16 to 18 cmN
Scew-Lok Retention in Housing ............................................................................. 20.0N min
Contact Retention in Housing (all contact types) ................................................. 6.0N min
Signal Insertion Force (per contact, using mating contact).................................. 2.8N max
Signal Withdrawal Force (per contact, using mating contact) ............................. 0.2N min
Power Insertion Force (per contact, using mating contact) ................................. 7.0N max
Power Withdrawal Force (per contact, using mating contact)............................. 0.2N min
Latch Retention in Housing .................................................................................... 4.0N min
2.5 WIRE TERMINATION INFORMATION – SIGNAL CRIMP PRODUCTS
Wire Type (recommended) .............................................BS 3G 210 type A, MIL-W-16878/6 type ET or
NEMA HP3 type ET
Maximum Insulation Diameter .......................................Ø0.80mm
Insulation Strip Length ....................................................1.50-1.75mm
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C/Note: 30051 Date: 08.06.20
G125 COMPONENT SPECIFICATION
C12510
Recommended Hand Crimp Tooling ...............................Hand Crimp Tool Z125-900, Positioner Z125-901,
Insertion/Removal Tool Z125-902
Recommended potting compound is Stycast 2651MM with Catalyst 9.
Wire Size Stranding
(AWG) (No. x Ømm)
Diameter
Circular MIL
Area (mm²)
(mm)
Area (CMA)
Crimp Tool
Setting
26
7 x 0.15
Ø0.533
0.128
253
6
28
7 x 0.13
Ø0.381
0.072
159
5
30
7 x 0.10
Ø0.305
0.057
100
5
32
7 x 0.08
Ø0.203
0.035
62
5
Crimp Height
(mm)
Min. pull-off
force (N)
18
13
0.95-1.10
12
6
For information on crimping Gecko signal contacts refer to Tooling Instruction Sheet IS-37. For
information on insertion/removal of Gecko signal cable contacts refer to Tooling Instruction Sheet IS38. There is also a Video on crimping and inserting Gecko contacts: https://www.harwin.com/harwintv
2.6 WIRE TERMINATION INFORMATION – POWER CRIMP PRODUCTS
Wire Type (recommended) .............................................M22759/11-18 PTFE (MIL-W-22759/11)
Maximum Insulation Diameter .......................................Ø1.35mm
Insulation Strip Length ....................................................1.90-2.30mm
Recommended Hand Crimp Tooling ...............................Hand Crimp Tool Z125-903, Positioner Z125-904,
Insertion/Removal Tool Z125-905
Recommended potting compound is Stycast 2651MM with Catalyst 9.
Wire Size (AWG)
Stranding
(No. x Ømm)
Diameter
(mm)
Area
(mm²)
Circular MIL
Area (CMA)
Crimp Tool
Setting
Min. pull-off force
(N)
18
19 x 0.25
Ø1.250
0.930
1624
8
85
For information on crimping Gecko-MT power contacts refer to Tooling Instruction Sheet IS-44. For
information on insertion/removal of Gecko power contacts refer to Tooling Instruction Sheet IS-47.
There is also a Video on crimping and inserting Gecko contacts: https://www.harwin.com/harwintv
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Issue: 10
C/Note: 30051 Date: 08.06.20
G125 COMPONENT SPECIFICATION
C12510
APPENDIX 1
APPENDIX 1.1. – GECKO-SL CONTACT NUMBERING
No. 1 Contact mark
No. 1 Contact mark
1
5
10
6
5
1
10
6
Female Crimp Housing
Male Crimp Housing
No. 1 Contact mark
1
6
No. 1 Contact mark
5
5
1
6
10
10
Female PCB mounted
Male PCB mounted
APPENDIX 1.2. – GECKO WITH LATCHES CONTACT NUMBERING
No. 1 Contact mark
No. 1 Contact mark
6
1
12
7
6
1
12
7
Female Crimp Housing
Male Crimp Housing
No. 1 Contact mark
No. 1 Contact mark
6
1
1
6
12
7
7
12
Female PCB mounted
Male PCB mounted
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C12510
Issue: 10
C/Note: 30051 Date: 08.06.20
G125 COMPONENT SPECIFICATION
C12510
APPENDIX 1.3. – GECKO-MT CONTACT NUMBERING
No. 1 Contact mark
1
A 5
No. 1 Contact mark
8 B
D C
B A
(02-08-02)
(01-08-01)
No. 1 Contact mark
No. 1 Contact mark
A 5
5
8
Male Crimp Housing
Female Crimp Housing
1
1
4
4
4
4
1
8
8 B
D C
Female PCB mounted
5
B A
Male PCB mounted
(01-08-01)
(02-08-02)
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C12510
Issue: 10
C/Note: 30051 Date: 08.06.20