What was the revenue for Skyworks in the second fiscal quarter of 2020 
medical applications. In mobile, we are leveraging our Sky5 platform across multiple flagship 5G launches including Samsung, Oppo, Vivo, Xiaomi and other Tier 1 players and expanding our technology reach across our customized Diversity Receive platforms with new 5G-centric solutions driving sharp gains in design win count. In IoT, we are supporting high-performance 5G and Wi-Fi enabled tablets specifically developed for health, safety, and telemedicine applications.
Across mobile operators, we are powering 5G hotspots with Verizon and AT&T supporting the expanding work-from-home trend. We're extending our market leadership in Wi-Fi 6 with home and enterprise gateways at Cisco. We're enabling home security applications at Honeywell and ramping remote patient monitoring systems with GE. We're also launching asset tracking and fleet management solutions with Juniper and BlackBerry.
Moving to the infrastructure space, we're supporting 5G Massive MIMO and small cell base station deployments across the U.S., Europe, and Japan and in automotive, we're accelerating connectivity content with leading brands including Volkswagen, Renault, Hyundai, and Nissan. These highlights demonstrate our technology leadership underpinned by a diverse and growing set of critical product categories resolving increasingly complex architectures and preparing our customers for the performance gains demanded in 5G.
In these unprecedented times, our existing technologies and connectivity protocols are processing extraordinarily high data traffic. This explosion in data consumption is taxing networks with real-time video, high-speed processing, streaming content, and a long list of critical services, all dependent upon seamless, reliable, and ubiquitous connectivity.
To illustrate how the pressure on the network capacity is intensifying, just over the last few months, we've seen visits to Amazon website rise more than 30% year-over-year, Zoom Video conferencing passing a milestone of 300 million daily participants, Microsoft Teams platform logging a single day record of 2.7 billion minutes and now with 5G just beginning to launch, the average user today is still working with legacy technologies showing system weakness in this high data demand environment.
Clearly more than ever, always on connectivity is paramount. Skyworks and our partners in the mobile and wireless ecosystems are anticipating and accelerating the development and delivery of much needed cutting-edge technologies led by 5G, Wi-Fi 6, enhanced GPS, and other networking protocols. As Skyworks and the world navigate this challenging environment, our focus will continue to ensure streamlined high-speed connectivity delivering a path for reliable, constant, and safe communication reaching all of our customers and their varied applications. With that, I will turn the call over to Kris for a discussion of Q2 and our outlook for Q3.
Kris Sennesael -- Senior Vice President and Chief Financial Officer
Thanks, Liam. Skyworks revenue for the second fiscal quarter of 2020 was $766 million, in line with the March 4 updated outlook where we reduced our revenue guidance for the COVID-19 impact by approximately $45 million. At $766 million, revenue is down 5% year-over-year. However, excluding Huawei-related revenue in both Q2 of fiscal '19 and fiscal '20, revenue is up 4% year-over-year despite the negative impact from COVID-19. Gross profit in the second quarter was $384 million resulting in a gross margin of 50.2%. Operating expenses were $135 [Phonetic] million, flat year-over-year as we continue to prudently manage opex while making the necessary investments to accelerate future growth of the business. We generated $249 million of operating income translating into an operating margin of 32.5%. Other income was $4.5 [Phonetic] million and our effective tax rate was 9.4% driving net income of $230 million or $1.34 of diluted earnings per share.
Turning to the balance sheet and cash flow. Second fiscal quarter cash flow from operations was $280 million and capital expenditures was $60 [Phonetic] milli
medical applications. In mobile, we are leveraging our Sky5 platform across multiple flagship 5G launches including Samsung, Oppo, Vivo, Xiaomi and other Tier 1 players and expanding our technology reach across our customized Diversity Receive platforms with new 5G-centric solutions driving sharp gains in design win count. In IoT, we are supporting high-performance 5G and Wi-Fi enabled tablets specifically developed for health, safety, and telemedicine applications.
Across mobile operators, we are powering 5G hotspots with Verizon and AT&T supporting the expanding work-from-home trend. We're extending our market leadership in Wi-Fi 6 with home and enterprise gateways at Cisco. We're enabling home security applications at Honeywell and ramping remote patient monitoring systems with GE. We're also launching asset tracking and fleet management solutions with Juniper and BlackBerry.
Moving to the infrastructure space, we're supporting 5G Massive MIMO and small cell base station deployments across the U.S., Europe, and Japan and in automotive, we're accelerating connectivity content with leading brands including Volkswagen, Renault, Hyundai, and Nissan. These highlights demonstrate our technology leadership underpinned by a diverse and growing set of critical product categories resolving increasingly complex architectures and preparing our customers for the performance gains demanded in 5G.
In these unprecedented times, our existing technologies and connectivity protocols are processing extraordinarily high data traffic. This explosion in data consumption is taxing networks with real-time video, high-speed processing, streaming content, and a long list of critical services, all dependent upon seamless, reliable, and ubiquitous connectivity.
To illustrate how the pressure on the network capacity is intensifying, just over the last few months, we've seen visits to Amazon website rise more than 30% year-over-year, Zoom Video conferencing passing a milestone of 300 million daily participants, Microsoft Teams platform logging a single day record of 2.7 billion minutes and now with 5G just beginning to launch, the average user today is still working with legacy technologies showing system weakness in this high data demand environment.
 Clearly more than ever, always on connectivity is paramount. Skyworks and our partners in the mobile and wireless ecosystems are anticipating and accelerating the development and delivery of much needed cutting-edge technologies led by 5G, Wi-Fi 6, enhanced GPS, and other networking protocols. As Skyworks and the world navigate this challenging environment, our focus will continue to ensure streamlined high-speed connectivity delivering a path for reliable, constant, and safe communication reaching all of our customers and their varied applications. With that, I will turn the call over to Kris for a discussion of Q2 and our outlook for Q3.
Kris Sennesael -- Senior Vice President and Chief Financial Officer
Thanks, Liam. Skyworks revenue for the second fiscal quarter of 2020 was $766 million, in line with the March 4 updated outlook where we reduced our revenue guidance for the COVID-19 impact by approximately $45 million. At $766 million, revenue is down 5% year-over-year. However, excluding Huawei-related revenue in both Q2 of fiscal '19 and fiscal '20, revenue is up 4% year-over-year despite the negative impact from COVID-19. Gross profit in the second quarter was $384 million resulting in a gross margin of 50.2%. Operating expenses were $135 [Phonetic] million, flat year-over-year as we continue to prudently manage opex while making the necessary investments to accelerate future growth of the business. We generated $249 million of operating income translating into an operating margin of 32.5%. Other income was $4.5 [Phonetic] million and our effective tax rate was 9.4% driving net income of $230 million or $1.34 of diluted earnings per share.
Turning to the balance sheet and cash flow. Second fiscal quarter cash flow from operations was $280 million and capital expenditures was $60 [Phonetic] milli