Transdnestr television said Thursday that 100 rubles in old notes would be worth one new coupon.
The new money has been printed in Russia and bears the portrait of 18th-century general Alexander Suvorov.
The Transdnestr region, which effectively broke away from Moldova in 1991, has rejected Moldova's leu currency, which is backed by Western credits and is relatively stable.
Transdnestr has suffered both runaway inflation and a serious shortage of bank notes.
As a stopgap, it has been using old Soviet money with a sticker bearing Suvorov's portrait.
At the current official rate, the Transdnestr rouble is worth 21,000-25,000 to the dollar.
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