Semiconductor chip, chip-on-chip structure device, and assembling method thereof
A semiconductor chip ( 3 ) to be positioned with a front face thereof downward for formation of a chip-on-chip structure has electrode marks ( 35 ) provided on a back face ( 34 ) thereof. The electrode marks ( 35 ) are respectively provided in association with a plurality of electrodes ( 33 ) provided on the front face ( 31 ) of the semiconductor chip in the same arrangement as the arrangement of the electrodes ( 33 ). The arrangement of the electrode marks ( 35 ) represents the arrangement of the electrodes ( 33 ) on the front face ( 31 ) when viewed from the side of the back face ( 34 ) of the semiconductor chip 3 . Therefore, the semiconductor chip ( 3 ) can easily be positioned with the front face downward on the basis of the electrode marks ( 35 ).
1. A method of assembling a semiconductor device, comprising the steps of:
placing a lead frame having a front face and back face, the lead frame having a back mark provided on the back face; and
positioning a semiconductor chip with respect to the lead frame on the basis of the back mark provided on the lead frame to bond the semiconductor chip to the front face of the lead frame.
2. A method of assembling a semiconductor device, comprising the steps of:
placing a lead frame having a front face and back face, the lead frame having a back mark provided on the back face;
bonding a first semiconductor chip onto the front face of the lead frame; and
positioning a second semiconductor chip with respect to the lead frame on the basis of the back mark provided on the lead frame to bond the second semiconductor chip onto the first semiconductor chip in a stacked relation.