In this paper, we introduce a new subclass of H-matrices named extended SDD1†\documentclass[12pt]{minimal}
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\begin{document}$$SDD_1^{\dag } $$\end{document} (for shortly, ESDD1†\documentclass[12pt]{minimal}
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\begin{document}$$ESDD_1^{\dag } $$\end{document}) matrices, discuss the relationships among ESDD1†\documentclass[12pt]{minimal}
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\begin{document}$$ESDD_1^{\dag } $$\end{document} matrices and other subclasses of H-matrices. Based on the properties of ESDD1†\documentclass[12pt]{minimal}
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\begin{document}$$ESDD_1^{\dag } $$\end{document} matrices, infinity norm upper bounds for the inverse of ESDD1†\documentclass[12pt]{minimal}
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\begin{document}$$ESDD_1^{\dag } $$\end{document} matrices are presented. As an application, error bound for linear complementarity problems of ESDD1†\documentclass[12pt]{minimal}
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\begin{document}$$ESDD_1^{\dag } $$\end{document} matrices is provided. Numerical examples show that the obtained results are better than some existing bounds.