which is compatible to TFX0250d5w Dell SMPS

The problem you have is that you live in India. You will have to search that model number on the web to see if there is anybody where you live that carries it. If not, you will be forced to buy directly from dell.
 
Cheaper to get a new case and transplant. A decent 400W PSU and case will probably be cheaper assuming your power requirements aren't excessive.
 
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