# Crystal marking

• Have you tried powering the circuit and measuring it? If not, why not? – Andy aka May 18 '16 at 20:55
• I tried the same but it didn't give me any result. Whenever do this, the micro-controller stop working. – Mahbubul Hossain May 18 '16 at 20:57
• Did you search that part number on the web? It maybe 40MHZ but not certain, and the other part numbers mean a lot. – user105652 May 18 '16 at 20:57
• I tried also google the marked on the device but didn't get anything – Mahbubul Hossain May 18 '16 at 20:59
• You'll note that I edited your question, the article in question is not a crystal oscillator, it is a crystal used in an oscillator. – placeholder May 18 '16 at 21:03

This is an Abracon crystal. Code is as follows:

                                      ATUHZYR
A = Abracon identifier ---------------'||||||
T = First "ten" digit of frequency ----'|||||
U = First "unit" digit of frequency ----'||||
H = First "tenth" digit of frequency ----'|||
Z = Month letter (A to L) ----------------'||
Y = Last digit of year --------------------'|
R = Traceability code ( character A to Z ) -'


Example:

4.0000MHz February 2003 would be coded A040B3C (as in your picture).

Source: Abracon.

• So you mean that the crystal shown in the picture is a value of 4 MHz? Please clarify clearly is it 4 MHz or 40 MHz? – Mahbubul Hossain May 18 '16 at 21:17
• @MahbubulHossain what part of "4.0000MHz" is NOT clear? – placeholder May 18 '16 at 21:20
• The SE way of thanking for the answer is to accept it. – Eugene Sh. May 18 '16 at 21:44