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Black compact box with one Mini DisplayPort plug and three HDMI ports

STARTECH

STARTECH MSTMDP123HD Mini DisplayPort 1.2 to 3x HDMI audio video converter

SKU CH-1J9B-STQBY MPN MSTMDP123HD

Connects three independent HDMI displays to a single Mini DisplayPort 1.2 output with included power adapter

  • TypeMini DP to HDMI
  • ColorBlack
  • Cable LengthNo
  • SpecificationsCenter Tip Polarity: Positive Input Current : 0.5 A Input Vo
  • Connector A1 - Mini-DisplayPort (20 pin) Male Output
  • Connector B3 - HDMI (19 pin) Female Output

Output HDMI - 3 Port

Struck-through versions exist but are not stocked here.

Style Mini DisplayPort

  • Mini DisplayPort
  • DisplayPort

Struck-through versions exist but are not stocked here.

  • Connect three independent displays from one mDP 1.2 port
  • Works with Lenovo ThinkPad and Microsoft Surface mDP devices
  • Compatible with HDMI projectors and monitors
  • Supports resolutions up to 4K across connected displays
  • Includes universal power adapter for reliable operation

Three independent displays from one port

The StarTech MSTMDP123HD connects three separate HDMI monitors to a single Mini DisplayPort 1.2 output. It is designed for users who need a multi-monitor workstation from laptops such as certain Lenovo ThinkPad and Microsoft Surface models. The hub supports audio pass-through to all connected displays.

Sustained multi-monitor operation

The adapter draws up to 0.5 A from the 110 ~ 240 AC supply via the included universal power adapter, delivering a stable 5 DC at 3 A to drive three outputs simultaneously. This external power ensures consistent signal quality across extended work sessions without taxing the host port.

Straightforward plug-and-play setup

The package contains the MST hub, a universal power adapter with NA, EU, UK and AU plugs, and a quick install guide. Connect the Mini DisplayPort male end to the host, attach three HDMI cables to the female outputs, and apply power. The main issue arises when the host graphics hardware does not support Multi-Stream Transport, limiting the hub to mirroring only.

Highlights

  • Connect three independent displays from one mDP 1.2 port
  • Works with Lenovo ThinkPad and Microsoft Surface mDP devices
  • Compatible with HDMI projectors and monitors
  • Supports resolutions up to 4K across connected displays
  • Includes universal power adapter for reliable operation

Specifications

BrandStarTech.com
ModelMSTMDP123HD
TypeMini DP to HDMI
ColorBlack
Cable LengthNo
SpecificationsCenter Tip Polarity: Positive
Input Current : 0.5 A
Input Voltage: 110 ~ 240 AC
Output Current: 3A
Output Voltage: 5 DC
Plug Type: N
Power Source: AC Adapter Included
Connector A1 - Mini-DisplayPort (20 pin) Male Output
Connector B3 - HDMI (19 pin) Female Output
AudioYes
FeaturesUse this adapter to connect three independent displays to a single mDP 1.2 port - Works with mDP devices such as models of Lenovo Think Pad and Microsoft Surface - Compatible with HDMI projectors and monitors - Resolutions up to 4K - Mini DisplayPort to HDMI multi monitor Hub / Mini DisplayPort splitter / mDP daisy chain hub / Video splitter / Triple head multi stream hub / mDP MST Hub / MST adapter - Increase your productivity by docking computer with a multi monitor workstation
Dimensions0.60" x 2.60" x 4.50"
Weight0.26 lb.
Package Contents1 - Mini DisplayPort to 3x HDMI MST Hub
1 - Universal power adapter (NA/EU/UK/AU)
1 - Quick install guide
Shipping weight0.50 kg
Package size246 × 150 × 69 mm

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Questions about this item

Does the 3 A output adapter run hot or make noise when driving three monitors all day?

The hub draws only 0.5 A at the AC input and uses a passively cooled enclosure, so it stays cool and silent during continuous use.

Which cables or monitors must I already have to use the three HDMI outputs?

You need three HDMI cables with 19-pin connectors and HDMI-equipped displays or projectors; the hub supplies the 5 V 3 A power.

Will this work with my older laptop that only has a Mini DisplayPort 1.2 port?

Yes, the 20-pin Mini DisplayPort 1.2 male connector plugs directly into that port and drives three independent HDMI screens.

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