| The new version replacing the old version |
| The industrial alternative commercial |
| A large memory instead of a small memory |
| Different brands but the same alternative features |
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When your chip meets a supply problem, you need to find a alternative chip，The most distressing thing is the need to modify your design version, which causes a lot of time cost and risk. Today, we will discuss three ways to find an alternative chip without the need to modify your design scheme.
The new version replacing the old version
The first way is with the new version replacing the old version,Some part of chips will have some upgrades with different development cycles, such as the correction of functions or deletion of redundant design, after the change of more function improvement, the old products will be stopped, with new models to cover and replace the old part, the following example to you to see
MC68HC908GP32CFB Production has been discontinued for a long time, the new replacement model is MC908GP32CFBE, the new part number can fully cover the old part， but the old part generally can not replace the new part， Since the new product has been upgraded and iterated, the products developed on this basis will have some problems if you go back to use the old products.
The industrial alternative commercial
The second is the industrial alternative commercial, industrial or automotive grade chip temperature resistance is higher than the commercial level, so the performance is also better, can be downward compatible instead,
Many components of temperature resistance even if there is no car level, but there will be industrial and commercial two, if you are out of stock product is commercial, then congratulations, you can find an industrial to replace emergency. Show you a group of examples.
MC9S12XA256VAA：This model temperature is industrial grade, -40 to 105 degree.
MC9S12XA256CAA：The temperature of this model is the commercial grade-40 to 85 degree.
Therefore, the suffix of VAA can replace CAA, but the low temperature one cannot in turn replace the high temperature, unless the working environment of the product does not need to reach the limit temperature of 105 degree
A large memory instead of a small memory
The third is a large memory instead of a small memory, a small memory can also be replaced by larger memory components
The same small memory can also be used with a larger memory components to replace, the same series, in addition to different memory, other parameters and functions including encapsulation are consistent, so there is no need to revise or change the scheme. Give you an example：
S9S12HA48J0CLL：the size of this model' s FLASH is 48kb
S9S12HA32J0CLL：has a Flash size of 32KB
Different brands but the same alternative features
Finally, there are different brands but the same alternative features
the alternatives to different brands but with the same functions, especially the common devices, generally have multiple brands to choose from, such as：
LM358 can find brands：ON、TI、st、Domestic brand.The brand selection range for LM393DR is similar to that of LM358.
In addition to some relatively basic chips, in recent years, there are also some domestic components to replace the standard imported model products, such as STM32F407ZGT6, some domestic brands can completely replace the products launched.
