May 26, 2021 
IPC announced today the April2021findings from its North American Printed Circuit Board (PCB) Statistical Program.The book-to-bill ratiostands at1.16.
Total North American PCB shipments in April2021wereup6.0 percentcompared to the same month last year.Compared to the preceding month,Aprilshipments fell 18.1percent.
PCB bookings in Aprilfell10.2percentyear-over-year. Bookings in Aprildecreased27.8percent from the previous month.
“After strong orders in March, April PCB shipments were constrained by ongoing supply chain disruptions,” said Shawn DuBravac, IPC’s chief economist. “The coming months will likely show volatile order and shipment flows.”
Detailed Data Available
Companies that participate in IPC’s North American PCB Statistical Program have access to detailed findings on rigid PCB and flexible circuit sales and orders, including separate rigid and flex book-to-bill ratios, growth trends by product types and company size tiers, demand for prototypes, sales growth to military and medical markets, and other timely data.
Interpreting the Data
The book-to-bill ratios are calculated by dividing the value of orders booked over the past three months by the value of sales billed during the same period from companies in IPC’s survey sample. A ratio of more than 1.00 suggests that current demand is ahead of supply, which is a positive indicator for sales growth over the next three to twelve months.A ratio of less than 1.00 indicates the reverse.
Year-on-year and year-to-date growth rates provide the most meaningful view of industry growth. Month-to-month comparisons should be made with caution as they reflect seasonal effects and short-term volatility. Because bookings tend to be more volatile than shipments, changes in the book-to-bill ratios from month to month mightnot be significant unless a trend of more than three consecutive months is apparent. It is also important to consider changes in both bookings and shipments to understand what is driving changes in the book-to-bill ratio.
IPC’s monthly PCB industry statistics are based on data provided by a representative sample of both rigid PCB and flexible circuit manufacturers selling in the USA and Canada. IPC publishes the PCB book-to-bill ratio bythe end of each month.
IPC (www.IPC.org) is a global industry association based in Bannockburn, Ill., dedicated to the competitive excellence and financial success of its 3,000-member company sites which represent all facets of the electronics industry, including design, printed board manufacturing, electronics assembly and test. As a member-driven organization and leading source for industry standards, training, market research and public policy advocacy, IPC supports programs to meet the needs of an estimated $2 trillion global electronics industry. IPC maintains additional offices in Washington, D.C.; Atlanta, Ga.; Miami, Fla.; Brussels, Belgium; Bangalore and New Delhi, India; Bangkok, Thailand; and Qingdao, Shanghai, Shenzhen, Chengdu, Suzhou and Beijing, China.
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