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请问在TI官网上申请样片有什么详细的准则吗

Other Parts Discussed in Thread: LM331, ADS1292

我是研究生一枚,做实验想申请一块LM331的样片,但是,在5块限制范围内,包括一块也不能申请,但是两个月前我用该账户也成功申请了ads1292芯片,为什么第二次申请样片就不能成功呢, 周围很多同学也是一样,新注册第一次能申请,到第二次就申请不了呢??