Debt (Tables)

3 Months Ended

Mar. 29, 2020

Components of Convertible Senior Notes

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

	March 29, 2020		December 31, 2019
	(in thousands)
Debt Principal	$	459,987	$	460,000
Unamortized discount		61,521		65,313
Net Carrying amount of convertible debt	$	398,466	$	394,687

	For the Three Months  Ended
	March 29, 2020		March 31, 2019
	(in thousands)
Contractual interest expense on the coupon	$	1,438	$	1,438
Amortization of the discount component and debt issue fees recognized as interest expense		3,792		3,608
Total interest expense on the convertible debt	$	5,230	$	5,046