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运放输出端对地10欧姆左右,损坏的原因探讨?

Other Parts Discussed in Thread: OPA2140

我用OPA2140(双运放SO8)做了一个比较器使用来放大一个小的方波信号,输出级对地并了一个10K电阻做假负载,然后有压敏电阻和自恢复保险丝做做过压过流,运放单供电DC12V,现在客户返回发现有一个运放输出的信号高电平只有两三百毫伏,结果静态量OUT脚与GND之间电阻只有10欧姆左右,请问导致这种损坏的原因有哪些?过压?短路?(芯片自有短路保护)还是其他?