Silicon Wafers with JEIDA Flats for R&D
What Types of Silicon Wafer Flats are Available?
The two most common types of wafer flats are the JEIDA and the SEMI standard. JEIDA wafers are smaller than SEMI standards and are used in Japan to orient substrate. Those in the rest of the world, including North America, use SEMI standards. The SEMI standard is the most common type of wafer. It can be used for all kinds of electronics. These specifications are available in many formats, so make sure you check the specifications before making a purchase.
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How are JEIDA Flats Different from SEMI Standard Flats?
JEIDA flats are 10mm smaller repectively than SEMI standards flats.
What is a Jeida Flat?
Jeida sounds like a Star Wars character, but it's not. Jeida flats are the Japanese standards length of edges cut out of round flats. The wafers are used for semiconductor purposes.
JEIDA Flats are the Japanese version of cuts in the wafer used for orienting the substrate. Unlike standard flats found in the rest of the world, JEIDA FLATS are 10mm shorter than SEMI standard on silicon wafers..
The rest of the world uses Semiconductor Standard Flats.
| Wafer Dimension Specification SEMI and JEIDA |
| DIAMETER | Dimension Tolerance |
SEMI JEIDA |
50.80 50.00 |
60.00 | 76.20 76.00 |
80.00 | 90.00 90.00 |
100.00 100.00 |
125.00 125.00 |
150.00 150.00 |
200.00 200.00 |
|
| SEMI JEIDA |
0.38 0.5 |
0.5 | 0.63 0.5 |
0.5 | 0.5 0.5 |
0.5 0.5 |
0.2 0.5 |
0.2 0.5 |
0.2 0.5 |
|||
| THICKNESS | Dimension Tolerance |
SEMI JEIDA |
0.279 0.280 |
0.330 | 0.381 0.380 |
0.400 | 0.475 0.475 |
0.52 0.525 |
0.625 | 0.625 0.625 |
0.675 0.625 |
0.725 0.725 |
| SEMI JEIDA |
0.025 0.010 |
0.015 | 0.025 0.015 |
0.025 | 0.025 0.025 |
0.020 0.015 |
0.020 0.015 |
0.020 0.015 |
0.020 0.025 |
|||
| PRIMARY FLAT LENGTH | Dimension Tolerance |
SEMI JEIDA |
15.88 17.50 |
20.00 | 22.22 22.00 |
22.00 | 27.00 27.00 |
32.50 32.50 |
42.50 42.50 |
57.50 47.50 |
57.50 57.50 |
|
| SEMI JEIDA |
1.65 2.50 |
2.50 | 3.17 2.50 |
3.00 | 3.00 2.50 |
2.50 2.50 |
2.50 2.50 |
2.50 2.50 |
2.50 2.50 |
|||
| SECONDARY FLAT LENGTH | Dimension Tolerance |
SEMI JEIDA |
8.00 - |
11.18 - |
11.50 - |
13.50 - |
18.00 - |
27.50 - |
37.50 - |
NO 2nd flat - |
||
| SEMI JEIDA |
1.65 - |
1.52 - |
1.50 - |
1.50 - |
2.00 - |
2.50 - |
2.50 - |
- - |
||||
| BOW MAX | Dimension | SEMI JEIDA |
0.038 | 0.040 | 0.040 | 0.040 | 0.040 | 0.040 | 0.060 | 0.065 | ||
| TOTAL THICKNESS VARIATION | Dimension | SEMI JEIDA |
0.012 0.015 |
0.020 | 0.025 0.025 |
0.025 | 0.025 0.025 |
0.010 0.025 |
0.010 0.025 |
0.010 0.025 |
0.010 0.025 |
|
| EDGE PROFILE COODINATE；Cy | Dimension | SEMI JEIDA |
0.093 | 0.127 | 0.133 | 0.158 | 0.175 | 0.208 | 0.208 | 0.225 | 0.242 | |