Abstract
The large scale production of the temperature compensated zener diode (TCZD) whose temp. coeff. is as small as 0.002%/deg is difficult and costly.
The methods so far proposed are inefficient, laborious and time-consuming.
In order to overcome these difficulties, we analyzed this problem from the statistical point of view, and found basic data to produce TCZD with good yield.
After general consideration we suggested a new type TCZD which contains two chips. The chip is recently reported by us and consists of several pn-junctions.
In this report we used the chip whose size is 500μ×500μ. After the sampling test we connected those pn-junctions together and constructed the TCZD.
A summary of the results in the small scale production is shown below.
The percentage of the TCZD, whose temp. coeff. is smaller than 0.002%/deg, was 80∼90% in each of the four lots.
