What was the revenue for NATI in Q3 2019 
s for early 5G R&D is a positive indicator for the automated validation and automated production applications that follow-in 2020 and beyond. Over the past 12 months, we have already seen a significant uptick in chip-makers building out sub 6-gigahertz production capacity, especially for 5G infrastructure equipment and this remains a growth driver for our overall semiconductor business.
While the deployment timing for millimeter wave 5G is on a different timeline in sub 6-gigahertz, we are currently shipping millimeter wave test systems for both validation and production test. So far, millimeter wave 5G deployments have been limited in scope and the cycle of automated validation and production test equipment has been somewhat delayed due to Huawei restrictions and Intel's exit from the 5G modem business and subsequent sale to Apple.
We believe these market conditions will dictate the pace at which market volume of millimeter wave 5G production test increases. Lead customers are already using our millimeter wave vector signal transceiver released in May 2019 and the reception of this product has been very strong. In transportation, we saw orders decline in Q3 below double-digit year-over-year.
We continue to see strong growth in our business in the areas of electrification, active safety and autonomy, while the rest of the transportation business reflects the weakness of the broader market. Our focus remains on mitigating these market weaknesses and continuing to aggressively invest in the areas of high growth in order to increase the proportion of our business in those applications.
Our aerospace, defense and government orders grew low single-digits year-over-year in Q3. Our platform continues to add significant value to this industry which benefits from our software-connected approach and the ability to help our customers control their proprietary IP and meet their needs for highly customized and long life cycle systems. The cycles of this industry tend to run counter to the overall industrial economy as the spending environment this year has remained positive.
With respect to our broad portfolio of customers in all other industries, which represents nearly half of our business, orders were down low single-digit year-over-year in Q3, compared to a very strong Q3 of 2018. Historically, this part of our business has been the most correlated to the PMI. Through the first three quarters of 2019, this part of our business has been experiencing the headwind of the weakness in the industrial economy, which we believe has begun to stabilize.
Strength in customer adoption of our software across all industries continued in the third quarter with orders up 6% year-over-year and strong growth in enterprise agreements up 14% year-over-year. We believe these results are positive indicators of future revenue growth potential and opportunities for our software-connected platform. In summary, we remain committed to our R&D investment, confident in our long-term strategy and believe we are in a strong position to take advantage of future growth opportunities.
Now, I'd like to turn it over to Karen Rapp, our Chief Financial Officer for the financial update.
Karen Rapp -- Chief Financial Officer and Treasurer
Thanks, Eric and congratulations. Our revenue in Q3 came in at the midpoint of our guidance at $340 million. Our earnings performance stayed strong in Q3 and we delivered $0.44 non-GAAP earnings per share, slightly ahead of the midpoint of our guidance. We are proud of our operational efficiencies and variable pay alignment to performance that helped structurally scale our profitability.
As Eric mentioned, our year-over-year bookings were down 5% in Q3 as compared to a strong quarter in Q3 2018, where we reported year-over-year bookings growth of 13%. Orders over $20,000 were down 4% year-over-year and orders under $20,000 were down 6% year-over-year. Compared to Q3 2017, orders over $20,000 were up 13% and orders under $20,000 were down 2%.
In Q3, revenue was down 2% in total year-over-year. By region in US dollar terms, revenue was 
s for early 5G R&D is a positive indicator for the automated validation and automated production applications that follow-in 2020 and beyond. Over the past 12 months, we have already seen a significant uptick in chip-makers building out sub 6-gigahertz production capacity, especially for 5G infrastructure equipment and this remains a growth driver for our overall semiconductor business.
While the deployment timing for millimeter wave 5G is on a different timeline in sub 6-gigahertz, we are currently shipping millimeter wave test systems for both validation and production test. So far, millimeter wave 5G deployments have been limited in scope and the cycle of automated validation and production test equipment has been somewhat delayed due to Huawei restrictions and Intel's exit from the 5G modem business and subsequent sale to Apple.
We believe these market conditions will dictate the pace at which market volume of millimeter wave 5G production test increases. Lead customers are already using our millimeter wave vector signal transceiver released in May 2019 and the reception of this product has been very strong. In transportation, we saw orders decline in Q3 below double-digit year-over-year.
We continue to see strong growth in our business in the areas of electrification, active safety and autonomy, while the rest of the transportation business reflects the weakness of the broader market. Our focus remains on mitigating these market weaknesses and continuing to aggressively invest in the areas of high growth in order to increase the proportion of our business in those applications.
Our aerospace, defense and government orders grew low single-digits year-over-year in Q3. Our platform continues to add significant value to this industry which benefits from our software-connected approach and the ability to help our customers control their proprietary IP and meet their needs for highly customized and long life cycle systems. The cycles of this industry tend to run counter to the overall industrial economy as the spending environment this year has remained positive.
With respect to our broad portfolio of customers in all other industries, which represents nearly half of our business, orders were down low single-digit year-over-year in Q3, compared to a very strong Q3 of 2018. Historically, this part of our business has been the most correlated to the PMI. Through the first three quarters of 2019, this part of our business has been experiencing the headwind of the weakness in the industrial economy, which we believe has begun to stabilize.
 Strength in customer adoption of our software across all industries continued in the third quarter with orders up 6% year-over-year and strong growth in enterprise agreements up 14% year-over-year. We believe these results are positive indicators of future revenue growth potential and opportunities for our software-connected platform. In summary, we remain committed to our R&D investment, confident in our long-term strategy and believe we are in a strong position to take advantage of future growth opportunities.
Now, I'd like to turn it over to Karen Rapp, our Chief Financial Officer for the financial update.
Karen Rapp -- Chief Financial Officer and Treasurer
Thanks, Eric and congratulations. Our revenue in Q3 came in at the midpoint of our guidance at $340 million. Our earnings performance stayed strong in Q3 and we delivered $0.44 non-GAAP earnings per share, slightly ahead of the midpoint of our guidance. We are proud of our operational efficiencies and variable pay alignment to performance that helped structurally scale our profitability.
As Eric mentioned, our year-over-year bookings were down 5% in Q3 as compared to a strong quarter in Q3 2018, where we reported year-over-year bookings growth of 13%. Orders over $20,000 were down 4% year-over-year and orders under $20,000 were down 6% year-over-year. Compared to Q3 2017, orders over $20,000 were up 13% and orders under $20,000 were down 2%.
In Q3, revenue was down 2% in total year-over-year. By region in US dollar terms, revenue was 