Debt (Tables)

6 Months Ended

Jun. 28, 2020

Components of Convertible Senior Notes

The below tables represent the key components of Teradyne’s convertible senior notes:

	June 28, 2020		December 31, 2019
	(in thousands)
Debt Principal	$	459,987	$	460,000
Unamortized discount		57,682		65,313
Net Carrying amount of convertible debt	$	402,305	$	394,687

	For the Three Months Ended				For the Six Months Ended
	June 28, 2020		June 30, 2019		June 28, 2020		June 30, 2019
	(in thousands)
Contractual interest expense on the coupon	$	1,438	$	1,438	$	2,875	$	2,875
Amortization of the discount component and debt issue fees recognized as interest expense		3,839		3,653		7,631		7,262
Total interest expense on the convertible debt	$	5,277	$	5,091	$	10,506	$	10,137