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Gecko-MT Connectors

1.25mm Pitch High-Reliability Signal & Power

Harwin’s Gecko-MT connectors provide the smallest, lightest mixed-technology connector with a low profile design, ideally suited for stacking and cable mating in areas where PCB real estate is at a premium. Vibration and shock resistant, miniature but with additional 10A contacts.

About Gecko-MT

  • 2A per contact (all electrically loaded; 2.8A per individual contact) for signal, 10A max power options
  • 4-finger Patented* contact design to maintain electrical contact through high vibration and shock
  • Beryllium Copper contact for improved temperature range: -65°C to +150°C
  • 1,000 mating cycles durability
  • Weight and space saving over Combi Micro-D connector products
  • Future-proofed materials – halogen-free, PFOS-free, SVHC-free and RoHS compliant
  • Low outgassing properties – 0.68% TML, 0.01% CVCM, 0.26 WVR (Water Vapour Recovered)

Product Styles

  • Symmetrical and Non-symmetrical contact configurations – Two symmetrical layouts of 1+8+1 and 2+8+2 (signal contacts in the middle, power on the outside). Six non-symmetrical layouts including 2, 3, 4 or 6 power contacts.
  • Board-to Board, Cable-to-Board and Cable-to-Cable – Female connectors in cable or vertical PCB throughboard, Male connectors in cable or horizontal PCB throughboard. Symmetrical versions compatible with existing Metal Backshells, giving the option of shielded cable assemblies when used with external braiding.
  • Screw-Lok options – Built with easy and fast “Mate-before-Lok” screw fixings. Connectors are fully mated before the captive screws need to be engaged. The range includes both standard gender (floating screw on female connector) or reverse fix (floating screw on male connector).

Size/Weight Advantage

With space and weight a consideration for many high-reliability applications, Gecko-MT delivers a signal pin spacing of 1.25mm, and compact power pins. This design means that these connectors achieve significant space and weight saving over alternative high-performance connectors such as Combi Micro-D.

The diagram highlights the size savings of a 1+8+1 Gecko-MT over a comparable Combi Micro-D.

1+8+1-contact Gecko-MT (dark grey) overlaid with 1+9+1-contact Micro-D (light grey)

Gecko is a focus product for Harwin, and is undergoing an active development program. The connectors are designed with automated assembly systems in mind – all PCB connectors can be purchased in Tape and Reel packaging.

* Patent Status: Granted US9017089, GB2501063, GB2548777

Technical Details


Female Contacts

High performance Beryllium Copper, Gold finish

Male Contacts

Copper Alloy, Gold finish


30% Glass-Filled High Temperature Nylon (Polyamide) 4T, rated to UL94V-0


Stainless Steel


Current (signal)

2.8A max per individual contact, 2A max all contacts electrically loaded

Current (power)

10A max

Working Voltage

450V DC or AC peak (250V DC or AC peak at 70,000ft/21km/44mbar)

Maximum Voltage

600V DC or AC peak (350V DC or AC peak at 70,000ft/21km/44mbar)

Contact Resistance

25mΩ max

Insulation Resistance

1GΩ min


Operating Temperature

-65°C to +150°C

Humidity Classification

56 days at 93% RH


10-2,000Hz, 1.5mm, 198m/s² (20G), 6 hours total


981m/s² (100G) in Z Axis, 490m/s² (50G) in X & Y Axis


0.68% TML, 0.01% CVCM,
0.26 WVR (Water Vapour Recovered)



1,000 mating cycles

Insertion force (per contact)

2.8N max for signal, 7.0N max for power

Withdrawal Force (per contact)

0.2N min

Wire Specification

Recommended Wire types (signal)

BS 3G 210 Type A, MIL-W-16878/6 type ET or NEMA HP3 type ET

Recommended Wire types (power)

M22759/11-18 PTFE (MIL-W-22759/11)

Wire Sizes

26 to 32 AWG signal, 18 AWG power

Insulation Diameter

Ø0.80mm max signal, Ø1.35mm max power

Strip Length

1.50-1.75mm signal, 1.90-2.30mm power


Technical Documents

Component Specification (including pin numbering system)

PDF Download

Catalog & Brochures

Gecko-MT – Product Datasheet

PDF Download

Test Reports

Test Report HT072 – Gecko-MT – Electrical, Mechanical and Environmental

PDF Download

HT087 – Gecko-MT Non-Symmetrical Connectors

PDF Download

Test Report HT030 – Gecko (G125 Series) – Electrical, Mechanical and Environmental

PDF Download

Test Report HT069 – Gecko – Backpotting Temperature Test

PDF Download

Test Report HT075 – Gecko-SL Shielded Cable Assemblies

PDF Download

Product Training

Gecko-MT – Product Training Module

PDF Download

Browse the Range

Cable Assemblies

Ready-to-use cabled connectors, single or double ended, fully inspected and tested. Backpotted for added strain relief. Ideal for both prototyping…

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Cable Connector Parts

Cable housings and contacts, sold separately. See Accessories and Tooling for cable crimping and assembly tools.

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PCB Connectors

Board-mounted connectors in male and female options. Low profile, with standard gender or reverse fix screw-loks.

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Tooling & Accessories

Associated products and tooling for the Gecko-MT range.

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