Minimum USDT TRC20 Transfer Amount
The TRON network itself doesn't enforce a minimum transfer amount for USDT — any minimums you run into come from somewhere else.
No network-level minimum
A direct wallet-to-wallet USDT TRC20 transfer can technically be for any amount, down to a very small fraction of a cent, as long as the sender covers the Energy cost of the transaction, which is unrelated to the amount being sent.
Where minimums actually come from
Exchanges commonly enforce their own minimum deposit amounts, below which a deposit either won't be credited or will be effectively lost to processing fees — these limits are set by each platform individually, not by TRON.
Practical advice
Before sending USDT TRC20 to any exchange or platform, check that specific platform's stated minimum deposit amount rather than assuming any amount is acceptable — sending below their threshold can result in funds that are difficult or impossible to recover.