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Debt (Tables) | 3 Months Ended
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Apr. 02, 2023
Components of Convertible Senior Notes | The tables below represent the key components of Teradyne’s convertible senior notes:
|  | April 2, 2023 |  |  | December 31, 2022 |
|  | (in thousands) |
Debt principal |  | $ | 35,109 |  |  | $ | 50,228 |
Unamortized debt issuance fees |  |  | — |  |  |  | 113 |
Net carrying amount of convertible debt |  | $ | 35,109 |  |  | $ | 50,115 |
Teradyne’s convertible senior notes were reported as current debt at April 2, 2023 and December 31, 2022. The interest expense on Teradyne’s convertible senior notes for the three months ended April 2, 2023 and April 3, 2022 was as follows:
|  | For the Three Months Ended |
|  | April 2, 2023 |  |  | April 3, 2022 |
|  | (in thousands) |
Contractual interest expense on the coupon |  | $ | 138 |  |  | $ | 311 |
Amortization of the issue fees recognized as interest expense |  |  | 113 |  |  |  | 66 |
Total interest expense on the convertible debt |  | $ | 251 |  |  | $ | 377 |

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- Definition Tabular disclosure of convertible debt instrument. Includes, but is not limited to, principal amount and amortized premium or discount. + References No definition available. + Details
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