Mark Byrne (26) was in a "bad place" when he took the items from his workplace at a west Dublin electrical shop.
He was fined €250 after Blanchardstown District Court heard he had since paid compensation.
Byrne, from Woodview Heights, Lucan, pleaded guilty to two counts of theft of goods at DID Electrical, Lucan Road.
He stole property worth €1,109 on January 18, 2020, and goods valued at €2,149 on January 20.
Garda Sergeant Maria Callaghan told Judge David McHugh officers went to the store on the later date and the manager informed them of thefts by an employee.
Gardaí were told a routine bag check was carried out before employees left work in the evening.
When his bag was checked, Byrne had €2,149 worth of electrical items in his possession. The court heard he had made no attempt to pay for them.
Byrne admitted the thefts when he was detained and questioned by gardaí.
The court heard "it had happened on a number of occasions". Byrne had no previous convictions.
Defence solicitor William Cadogan said Byrne was working at DID at the time of the thefts.
He had addiction issues and was in a "very bad place", Mr Cadogan said.
He had learned a salutary lesson from the case and had addressed his addiction problems since then.
Since the charges first came before the court, Byrne had paid compensation to DID, Mr Cadogan added.
The case was a "fly in the ointment" for Byrne, who had otherwise never been in trouble before, the judge said.
He told the accused it was a complete breach of trust for someone to steal from their employer, but he would deal with it by way of a fine.