It depends on why he was terminated.
An employee who was terminated for just cause, or for valid reasons arising from his fault or negligence, as enumerated in Article 297 of the Labor Code, is not entitled to any separation pay.
On the other hand, an employee who was terminated for authorized cause, or for valid technological, economic, financial, business or health reasons, as enumerated in Article 298 of the Labor Code, is entitled to separation pay.