Dozens of countries have agreed to abolish duties on 201 technology products - from advanced computer chips to GPS devices, printer cartridges and video-game consoles.
The agreement, announced in Washington on Friday, marks the World Trade Organization's first tariff-killing deal in 18 years.
The deal is an expansion of the 1997 Information Technology Agreement, which includes 80 WTO member countries.
The updated accord covers products that generate $A1.36 trillion ($US1 trillion) in annual global revenue, including $US100 billion a year for American companies.
The product list includes new-generation semi-conductors, GPS navigation systems, medical products which include magnetic resonance imaging machines, printed circuits and satellites, the WTO said.
The worldwide total is equal to global trade in iron, steel, textiles and clothing combined, according to the WTO.
“Eliminating tariffs on trade of this magnitude will have a huge impact," said WTO Director-General Roberto Azevêdo.
"It will support lower prices — including in many other sectors that use IT products as inputs — it will create jobs and it will help to boost GDP growth around the world."
US Trade Representative Michael Froman called the agreement "great news for the American works and businesses that design manufacture and export state-of-the-art technology and information products".
His office says the deal will support 60,000 American jobs.
Not all 161 WTO member countries signed on to the expanded deal. But all will benefit because it eliminates the tariffs on dozens of tech products no matter which WTO country they come from.
Dean Garfield, president of the Information Technology Industry Council trade group in Washington, said the deal "will open markets, create jobs and spur economic growth around the world, as well as bring down costs for consumers".
Talks on revising the technology agreement began in 2012. The breakthrough occurred when the US and China worked out most of their differences during Chinese President Xi Jinping's visit to Washington last November.
Negotiators still must complete technical details and a timetable for eliminating the tariffs. The work is expected to be complete by the time WTO members meet in Nairobi, Kenya, in December.
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