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Exhibit 12.1

# CERTIFICATIONS

I, Boaz Eitan, certify
that:

| | 1. | I
have reviewed this Annual Report on Form 20-F of Saifun Semiconductors Ltd;
| | -- | -----------------------------------------------------------------------------

| | 2. | Based
on my knowledge, this Report does not contain any untrue statement of a
               material fact or omit to  state a material fact necessary to make the
               statements made, in light of the circumstances under which such
statements were made, not misleading with respect to the period covered by this Report;
| | -- | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

| | 3. | Based
on my knowledge, the financial statements, and other financial information
               included in this Report, fairly present in all material respects the
financial                condition, results of operations and cash flows
of the company as of, and for, the periods presented in this Report;
| | -- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

| | 4. | The companys other certifying officer and I are responsible for
                    establishing and maintaining disclosure controls and procedures (as
defined in                     Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal
control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and
15d-15(f)) for the company and have:
| | -- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

| | (a) | Designed
such disclosure controls and procedures, or caused such disclosure controls and
procedures to be designed under our supervision, to ensure that material information
relating to the company, including its consolidated subsidiaries, is made known to us by others within those
entities, particularly during the period in which this Report is being prepared;
| | --- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

| | (b) | Designed
such internal control over financial reporting, or caused such internal control over
financial reporting to be designed under our supervision, to provide reasonable assurance
regarding the reliability of financial reporting and the preparation of financial
statements for external purposes in accordance with generally accepted accounting
principles;
| | --- | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

| | (c) | Evaluated the
effectiveness of the companys disclosure controls and procedures and presented in
this Report our conclusions about the effectiveness of the disclosure controls and
procedures, as of the end of the period covered by this Report based on such evaluation;
and
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| | (d) | Disclosed in
this Report any change in the companys internal control over financial reporting
that occurred during the period covered by the Annual Report that has materially
affected, or is reasonably likely to materially affect, the companys internal
control over financial reporting; and
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| | 5. | The
companys other certifying officer and I have disclosed, based on our
               most recent evaluation of internal control over financial reporting, to
the                companys auditors and the audit committee of the companys
board of directors (or persons performing the equivalent functions):
| | -- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

| | (a) | All
significant deficiencies and material weaknesses in the design or operation of internal
control over financial reporting which are reasonably likely to adversely affect the
companys ability to record,
process, summarize and report financial information; and
| | --- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

| | (b) | Any
fraud, whether or not material, that involves management or other employees who have a
significant role in the companys internal control over financial reporting.
| | --- | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------

Date: April 2 , 2007

| |  | By: /s/ Boaz Eitan
Dr. Boaz EitanChief Executive Officer and Chairman
| |  | -----------------------------------------------------------------------------------



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