Product size indication of flat chip resistors
The size indication of chip resistors are divided into three ways; code, milimeter and inch.
Code indication combining a figure and an alphabet, like 1J, 2A..., this originally means the rated power(1J: 1/16W, 1/10W: 2A, 1/8W: 2B, 1/4W: 2E...). When flat chip resistors were developed initially, the rated power meant the product size. KOA has improved the rated power of each product size, but using the code, 1J, 2A... has been already known as size. So we still use these codes to show the product size.
The size in milimeter and in inch, both are indicated in four figures(five figures exceptionally).
In milimeter size, AABB means L is A.Amm and W is B.Bmm fron the top.
For example, 1608 means L = 1.6mm× W = 0.8mm.
In inch size, CCDD means L is 0.CC inch and W is 0.DD inch from the top.
For example, 0603 means L = 0.06 inch × W= 0.03 inch.
KOA catalogue shows the four figures of inch size code in paranthesis below the letter code, 1J, 2A..., but milimeter size code is widely used in Japan.
Three ways of indication are shown in the table below.