Emily Yang
Analyst · Longbow
Thank you, Brett, and good afternoon. As Dr. Lu and Brett highlighted, first quarter revenue grew 10% year-over-year as we continue to gain increasing market share. Looking more closely at first quarter revenue, U.S. revenue was down slightly mostly driven by the Chinese New Year and weaker demand in Asia. We started to see a recovery for Diodes business for March. Europe had record high result and the North America remained strong. Distributor inventory in terms of weeks increased sequentially in the first quarter, but is within our normal range of 11 to 14 weeks. We expect distributor inventories to remain within our normal range of 11 to 14 weeks in the near term.
Looking at global sales in the first quarter, Asia represented 70% of the revenue, Europe 13% and North America 13%. In terms of our end markets, industrial was once again our largest representative end market at 29% of revenue, consumer 23%, communication also 23%, computing 15% and automotive 10% of revenue.
Now let me review the end markets in greater detail. As Dr. Lu mentioned, our automotive end market had a record quarter, growing 7% sequentially and 23% year-over-year and reaching a record 10% of total revenue. This continued growth is a result of our past design win activity and momentum across an expanding customer base in all application areas, particularly in our 3 focus areas of connected driving, which consists of ADAS, Telematics, and Infotainment system, comfort, style and safety, including lighting and brushless DC motor control, and Powertrain covering conventional hybrid and electric vehicles.
From a product perspective, both our analog and discrete product family continue to be strong for us in the automotive market. PCI Express has become the interface of choice for the backbone transmission of engine control unit, ADAS, navigation, telematics and infotainment systems. Diodes is well positioned to address this need with a variety of product design to support PCI Express protocol. In fact, Diodes is the only supplier to offer PCI Express 4.0 Clock Generators and Clock Buffers with AECQ Grade 2 105 C ambient temperature support.
We are also seeing a lot of activities from automotive customers for our DC-DC converters, timers and USB switches for USB Type-C, infotainment and charging applications. Our sensor business also continues to grow in applications like power windows, doors, seatbelts, pumps and shifting gears. We also continue to gain traction with MOSFET designing across a number of auto applications as well as strong revenue growth in battery management system applications for automotive with Zener diodes and rectifiers. As a result of our automotive expansion initiatives, over the past 5, 6 years, we have increased our potential semiconductor content per vehicle to $85 per vehicle, an increase from our prior estimate of $70, which will continue to drive further revenue upside towards our long-term targets.
We also saw strong growth in industrial end markets with revenue increasing almost 12% sequentially and 39% year-over-year to reach a record 29% of total revenue. Our momentum continued with new design win activities across applications such as metering, DC fans, power tool and power supply, as well as home appliances, including e-lock applications. With our newly introduced low-power PCI Express 2.0 Packet, which will continue to expand our market position in industrial PC with expanding designing activities.
Our products low-power performance gives Diodes a leading position in the small[indiscernible] and port expansion application. We are also seeing USB Type-C adoption into medical equipment with our HDMI over Type-C Crossbar Switch designing for transporting video image to the monitor over our USB Type-C interface. In the consumer market, we continue to see growth for our SBR and Schottky products for new applications like smart sneakers, handheld portable devices, wire and wireless chargers, gaming, vehicles, OLED TVs as well as USB EOS and data line protection. Additionally, we have seen significant design win activities with DC-DC products driven by IPTV, over-the-top TV and set-top box applications as well as bipolar transistor designing for TV and monitor applications.
We're also seeing strong demand for our Hall Sensors in applications like wireless earbud and IoT. And our audio products are gaining traction in monitor and gaming applications. Also in the first quarter, we saw increasing content growth in TV panel applications across a broad range of products, including switching diodes, Zener diodes and transient voltage suppressors. We're also beginning to see revenue growth in ambulance-related applications on low-profile small form factor switching diodes products.
In the communications end market, we're seeing new design wins in 5G applications like base stations, CPE, small cell and data centers for many of our products including PCI Express 2.0 Packet Switches, I Square C/SPI port expanders, level shifters, MOSFETs and timing. We're also seeing an increasing need for sensors in smartphone applications with a demand for high-speed, low-loss MIPI switches continue to grow in mobile applications as display resolution and number of camera module increase. Power density in particular is a key concern for smartphone manufacturers. And Diodes has been actively engaged in this market with its comprehensive small footprint DFN and CSP MOSFET portfolio as well as our AC-DC products in charging adopter application. The mobile device and smartphone market continues to be a key growth area for our protection products, especially in support of the latest trend to replace a 3.5-millimeter audio jack with a USB Type-C connector.
Lastly, in computing, power density and efficiency are driving our hardware evolution and Diodes is at the forefront with our comprehensive portfolio of MOSFET power blocks and SGP MOSFET in the DC-DC power conversion. Additionally, our diodes and rectifier product continue to expand in mobile and desktop power applications as well as wireless charging and printer applications with broad range of products, including fast and ultra-fast recovery rectifiers, a high voltage switching diodes and TVS Zener diodes. With an increasing adoption of USB Type-C in the notebooks and PCs, we have been seeing strong revenue growth for our complete USB Type-C solution, including switches, ReDrivers, timing, charging and protection products.
In summary, our first quarter once again demonstrated a solid operating leverage in our business model result in a record profitability despite a sequential lower revenue. Our strong position with customers as well as our past design win activities has enabled us to consistently gain market share and outperform the market. Additionally, our increase in content in both the automotive industrial market combined with expanded opportunity for our Pericom product position us to drive continued revenue and profitability growth in the coming quarters.
With that, we will now open the floor to questions. Operator?