Investopedia says debentures are bonds with no collateral. Is that to say a convertible debenture would be viewed as a weak link.
No, not necessarily. I would like to see two positive things: 1. An interest rate around market 5% to 8% depending on the length of the loan. 2. A conversion price that's around 40% above current prices.
It's also necessary that the bond's conversion feature be absolutely fixed; no adjustment for dropping prices.