Amphenol K-Series (3.5mm) Plugs and Jacks

Table of Contents

Amphenol’s plugs and sockets range continually expand to meet the needs of our customers. The success of the M-Series phone plugs led to the RCA series being developed. The Miniature XLR range was a natural progression from our standard XLR series as the demand for smaller interconnects increased.

The latest addition to the range is a professional grade 3.5mm phone plug designed for applications that require a robust interconnect.


  • Mono or TRS (Stereo).
  • AX Series-inspired shell design.
  • Suits Cable O.D from 2.5mm to 5mm (0.098” to 0.196”)
  • Robust diecast shell in Satin Nickel or Black finish.
  • Nickel or Gold contact plating.
  • Flexible grommet cable protection.
  • Improved solderability.
  • Precision machined contacts.
  • Standard or Bulk packaging.


  • Black Shell,
  • Gold contacts.


GENERAL CHARACTERISTICS Number of Contacts 2 Pole (Mono)
3 Pole Tip Ring Sleeve (Stereo)
Termination Solder
Wire Gauge – Stranded Wire 2 Pole (Mono): AWG 16 – 1.5mm2
3 Pole (Stereo): AWG 18 – 1mm2
Flammability rating of insulating plastics UL94V-0
Solderability complies with IEC 68-2-20
Environmental Complies with EU RoHS 2 Directive 2011/65/EU
ELECTRICAL CHARACTERISTICS Current Carrying Capacity >0.5mA (Depends on Mating Connector and Cable)
Typical Contact Resistance ≤20mΩ (Depends on Mating Connector and Cable)
Insulation resistance (initial) >200M Ω
After Damp Heat Test >100M Ω
Test Voltage AC RMS: Dielectric Strength 250VAC
Operating Temperature -20ºC to +65ºC (-4ºF to +149ºF)
MECHANICAL CHARACTERISTICS Insertion and Withdrawal Force <20N / >3N (depends on mating connector)
Cable O.D. 3mm to 5mm (0.118” to 0.196”)
Mechanical Operations 1000 mating cycles
Weight 8g (0.017lb)
MATERIALS Connector Shell Material (Plugs) Diecast Zinc Alloy EZDA No.3
Connector Shell Finish Satin Nickel or Black Polyester
Insulators PA66
Cable Bushing Santoprene
Contacts Brass
Plating Nickel or Gold Flash

Part Number of Models

3.5mm, Mono Phone plug, Diecast Shell, Satin finish, Flexible grommet. Standard KM2P
Gold Plated Contacts KM2P-AU
Bulk Pack KM2P BULK
3.5mm, Mono Phone plug, Diecast Shell, Black finish, Flexible grommet. Standard KM2PB
Gold Plated Contacts KM2PB-AU
Bulk Pack KM2PB BULK
3.5mm, Stereo Phone plug, Diecast Shell, Satin finish, Flexible grommet. Standard KS3P
Gold Plated Contacts KS3P-AU
Bulk Pack KS3P BULK
3.5mm, Stereo Phone plug, Diecast Shell, Black finish, Flexible grommet. Standard KS3PB
Gold Plated Contacts KS3PB-AU
Bulk Pack KS3PB BULK
3.5mm, Stereo Phone plug with extended shaft for mobile phones fitted with covers.Diecast Shell, Black Chrome finish, Flexible grommet Standard KS3PC
Gold Plated Contacts KS3PC-AU

About Amphenol

Amphenol Australia’s head office is based in Melbourne, Victoria, and is the Sales, Marketing, and Engineering center of excellence for an extensive range of professional connector and cabling products. Amphenol’s global presence allows us to take full advantage of our numerous corporate resources and product portfolio to provide you with a vast offering and choice. Our extensive range is designed to meet the specific needs of the entertainment markets to make the selection of your interconnect partner an easy choice.

The company has been producing products for the pro-audio industry for over fifty years. Since the development of our XLR AC Series connectors, Amphenol has continued to provide our customers with exacting quality in an increasingly competitive environment. Continuous improvement through ISO9001, a focus on environmental awareness, and the development of next-generation industry-leading products are our philosophies. As the entertainment industry moves into the future emerging technologies from other industries have become more prevalent and more challenging.

Amphenol Australia’s global presence combined with its close technical relationships with other Amphenol sister divisions, each a specialist and leader in their own interconnect field, places it well to support innovation and meet this challenge head-on. The ability of Amphenol to provide a full range of design services required to support the customer’s applications design and modeling, applications engineering, fabrication, value-added assembly, and testing, coupled with the largest interconnect offering on the market means that Amphenol can support all of your system-level needs.

Download Catalog: Amphenol Connector Catalog


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