Hirose U.FL

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Miniature RF connector

title: "Hirose U.FL" type: doc version: 1 created: 2026-02-28 author: "Wikipedia contributors" status: active scope: public tags: ["rf-connectors"] description: "Miniature RF connector" topic_path: "general/rf-connectors" source: "https://en.wikipedia.org/wiki/Hirose_U.FL" license: "CC BY-SA 4.0" wikipedia_page_id: 0 wikipedia_revision_id: 0

::summary Miniature RF connector ::

::data[format=table title="Infobox connector"]

FieldValue
nameHirose U.FL
typeRF coaxial connector
image[[Image:2 mm SMD UFL Socket.jpg
captionMale U.FL connector
design_date1991
manufacturerHirose Electric Group
diameter2.0 mm
cableCoaxial
passbandTypically 0-6 GHz
::

NOTOC |name = Hirose U.FL |type = RF coaxial connector |image = [[Image:2 mm SMD UFL Socket.jpg|250px]] |logo = |caption = Male U.FL connector |designer = |design_date = 1991 |manufacturer = Hirose Electric Group |diameter = 2.0 mm |width = |height = |electrical = |earth = |maximum_voltage = |maximum_current = |cable = Coaxial |passband = Typically 0-6 GHz |physical_connector =

::figure[src="https://upload.wikimedia.org/wikipedia/commons/7/7d/RouterBoard_112_with_U.FL-RSMA_pigtail_and_R52_miniPCI_Wi-Fi_card.jpg" caption="RSMA]] pigtail and R52 mini PCI Wi-Fi card."] ::

Hirose U.FL, I-PEX MHF I, AMC or UMCC is a miniature RF connector for high-frequency signals up to 6 GHz manufactured by Hirose Electric Group,Ultra Small Surface Mount Coaxial Connectors - Low Profile 1.9 mm or 2.4 mm Mated Height U.FL Series. Hirose data sheet. I-PEX, and others.

U.FL connectors are commonly used in applications where space is of critical concern, such as in smartphones and laptop Wi-Fi cards. U.FL connectors are commonly used inside laptops and embedded systems to connect the Wi-Fi antenna to a Mini PCI, Mini PCIe or M.2 Wi-Fi card. Another common use is connecting GPS antennas.

Female U.FL connectors are not designed with reconnection in mind, and they are only rated for a few reconnects (approximately 30 mating cycles) before replacement is needed. The female U.FL connectors are generally not sold separately, but rather as part of a pigtail with a high-quality 1.32 mm doubly shielded cable, which allows for a low-loss connection, insulated with fluorinated resin.

The male connectors are surface-mounted (SMT) and soldered directly to the printed circuit board (PCB). They are designed to have a characteristic impedance of 50 ohms. The mated connection is only 2.5 mm high and takes as little as 9 mm2 (3.0 × 3.1 mm) of board space.

Much like many other electronic components, Hirose U.FL connectors were protected by patents and trademarks. However, compatible third party connectors are available under many other names, such as Sunridge MCB.

Hirose W.FL

|name = Hirose W.FL |type = RF coaxial connector |image = |logo = |caption = |designer = |design_date = |manufacturer = Hirose Electric Group |diameter = |width = |height = |electrical = |earth = |maximum_voltage = |maximum_current = |cable = coaxial |passband = 0-6 GHz |physical_connector = The Hirose W.FL, also known as Amphenol AMMC, is an ultra-small RF connector used in handheld electronic products. It is manufactured by Hirose Electric Group and has a frequency range up to 6 GHz. W.FL occupies even less area (2.0 mm diameter) and height (1.4 mm) than U.FL. Like U.FL, W.FL also has many more names assigned to it by those producing compatible connectors.

Variants

Many confusingly-similar looking connectors are called U.FL. The same or compatible connectors can also confusingly have multiple names, coming from different vendors or being transcribed differently.

  • H.FL
    • older, bigger, footprint 5x4.5 mm, square area 4.5x4 mm, male outer diameter 2.4 mm, center pin diameter 0.5 mm, mated height 3.0 mm
    • up to 3 GHz, cable groups 1.32/1.37/1.48 mm and RG178
  • E.FL
    • older, bigger, footprint 3.4x3.4 mm, square area 2.8x2.8 mm, male outer diameter 2.0 mm, center pin diameter 0.5 mm, mated height 3.0 mm
    • up to 2 GHz, cable groups 0.81/1.32 mm
  • U.FL, I-PEX MHF I, IPEX1, IPX1, MHF, MHF I, MHF1, AMC, MCRF, GS, TXR, UM, UMC, UMCX, ultra-miniature coaxial:
    • footprint 3.0x3.1 mm, square area 2.6x2.6 mm, male outer diameter 2.0 mm, center pin diameter 0.5 mm, mated height 2.4 mm (2.5 mm max) or 1.9 mm (2.5 mm max) for U.FL-LP(V)
    • most common
    • up to 6 GHz, cable groups 0.81/1.13/1.32/1.37 mm (LP(V) only 0.81 mm), MHF1 also RG174 and RG178
    • MHF 1 LK with a slide-over mechanical lock
    • N.FL variant with reduced mating height (1.4 mm (1.5 mm max), barrel portion height 0.25mm, total male connector height off board 0.8 mm), 6 GHz, cable group 0.81 mm
  • IPEX2, IPX2
    • lower mated height than IPEX1, otherwise somewhat similar
    • very rare
  • IPEX3, IPX3, MHF III, MHF3:
    • footprint 2.00x2.05 mm, square area 1.7x1.7 mm, male outer diameter 1.40 mm, center pin diameter 0.40 mm
    • some sources claim compatibility with W.FL (dubious?)
  • W.FL, IPEX4, IPX4, MHF IV, MHF4, MHF4/4L, AMC4, HSC, MXHP32:
    • footprint 2.0x2.0 mm, square area 1.76x1.68 mm, male outer diameter 1.5 mm, center pin diameter 0.45 mm, mated height 1.2 mm (1.4 and 1.7 mm for thicker cables)
    • increasingly common, especially with 5GHz devices and 5G
    • up to 6 or 9 GHz, cable group 0.81 mm, MHF4L also 0.64, 0.95, 1.13 and 1.37 mm
    • MHF4L up to 12 GHz, or to 9 GHz when mated with MHF4 female
    • M.2 standard (MHF4L)
    • W.FL2 variant with mated height 1.2 mm
    • MHF 4 LK with a slide-over mechanical lock
    • may be slight difference between MHF4 and W.FL, MHF4(L) said to be compatible
  • X.FL, IPEX5, IPX5, MHF5, MHF5L:
    • footprint 2x2 mm, square area 1.7x1.7 mm, male outer diameter 1.40 mm, mated height max. 1 mm (MHF5) or 1.3mm (MHF5L)
    • up to 12 GHz, MHF 5L up to 15 GHz; cable groups 0.5/0.64/0.81/1.13 mm
    • incompatible with W.FL/W.FL2
  • MHF7
  • MHF7S
    • footprint 2x2 mm, square area 2.0x2.0 mm, male outer diameter 1.5 mm, center pin diameter 0.35 mm, mated height 1.4 mm max, male total height from board 0.53 mm
    • up to 15 GHz, full EMI shield, for 5G mmWave applications

Other similar connectors with male on board: JSC, KSC, LSC, MHF-A, OSMT (dissimilar)

With female on board: MHF-SW23, MMS, MMT, MS-156C, MS-162, MS-166, MS-180, SWD, SWF, SWG, SWH, SWJ

Notes

References

References

  1. "AMC Ultra Miniature Connectors {{!}} Amphenol RF".
  2. [https://www.i-pex.com/product/mhf-I MHF I] - 9 GHz, 2.5 mm mated height
  3. [http://www.farnell.com/datasheets/307202.pdf SMT Ultra-Miniature Coaxial Connectors - Product Specifications]
  4. [http://www.rfconnector.com/sheets/IPXLM11GPB-113.pdf IPX datasheet]
  5. "U.FL and W.FL Series Connectors - Hirose │ DigiKey".
  6. "PDF of Hirose introduction to W.FL and U.FL Coaxial connector series Product Training Module (PTM)".
  7. [https://patents.google.com/patent/US5180315 Surface-mounted, high-frequency coaxial connector.] US Patent 5180315 (1993)
  8. [https://www.richardsonrfpd.com/docs/rfpd/Amphenol%20RF%20AMMC.pdf AMMC series datasheet]
  9. "Hirose W.FL Coaxial Cable Connector".
  10. (21 October 2009). "IPEX MHF3 Mini Coax Connector".
  11. (July 2025)
  12. (July 2025)
  13. "Connector identification online - the electronic connector book".
  14. https://diyshop.com.ua/image/cache/catalog/product/quadrocopter/konnektors/i-pex/MHF%201-650x650.jpg {{Bare URL image. (July 2025)
  15. "MHF Cables with MHF1, MHF3, MHF4 Connectors".
  16. https://www.wellshow.com/spec/connector/hirose/N.FL.pdf {{Bare URL PDF. (July 2025)
  17. https://ae01.alicdn.com/kf/H261166db561b4588a4d0de32e6e22d48o/10PCS-LOT-uFL-u-FL-IPX-IPEX-1-Male-Plug-PCB-Soldering-Panel-IPEX1-PCB-RF.jpg {{Bare URL image. (July 2025)
  18. "Connector identification online - the electronic connector book".
  19. https://www.i-pex.com/sites/default/files/downloads/pdf/CATALOG_MHF_4_E.pdf {{Bare URL PDF. (July 2025)
  20. https://diyshop.com.ua/image/cache/catalog/product/quadrocopter/konnektors/i-pex/MHF%204-650x650.jpg {{Bare URL image. (July 2025)
  21. "MHF® 4 | I-Pex".
  22. "MHF Cables with MHF1, MHF3, MHF4 Connectors".
  23. "MHF® 4L | I-Pex".
  24. "MHF® 4 | I-Pex".
  25. "Grand-Tek | IPEX MHF vs HRS U(W).FL Series Comparison".
  26. "Connector identification online - the electronic connector book".
  27. https://www.i-pex.com/sites/default/files/downloads/pdf/CATALOG_MHF_5_E.pdf {{Bare URL PDF. (July 2025)
  28. https://ae01.alicdn.com/kf/S1cd645c5bd8345ecbb33c57ecd260e51M.png {{Bare URL image. (July 2025)
  29. https://www.i-pex.com/sites/default/files/downloads/pdf/2D_MHF_7S_RECEPTACLE_20981C5.pdf {{Bare URL PDF. (July 2025)
  30. "RF Connectors | I-PEX".

::callout[type=info title="Wikipedia Source"] This article was imported from Wikipedia and is available under the Creative Commons Attribution-ShareAlike 4.0 License. Content has been adapted to SurfDoc format. Original contributors can be found on the article history page. ::

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