Debt (Tables)

3 Months Ended

Mar. 30, 2014

Components of Convertible Senior Notes

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

	March 30, 2014		December 31, 2013
	(in thousands)
Debt principal	$	—	$	189,998
Unamortized debt discount		—		4,290
Net carrying amount of the convertible debt	$	—	$	185,708

Interest Expense on Convertible Senior Notes

The interest expense on Teradyne’s convertible senior notes for the three months ended March 30, 2014 and March 31, 2013 was as follows:

	For the Three Months Ended
	March 30,  2014		March 31,  2013
	(in thousands)
Contractual interest expense	$	1,757	$	2,137
Amortization of the discount component and debt issue fees		4,493		3,957
Total interest expense on the convertible debt	$	6,250	$	6,094