A method for manufacturing a Laterally Diffused Metal Oxide Semiconductor (LDMOS) transistor with implant alignment spacers includes etching a gate stack comprising a first nitride layer. The first nitride layer is on a silicon layer. The gate stack is separated from a substrate by a first oxide layer. The gate stack is oxidized to form a polysilicon layer from the silicon layer, and to form a second oxide layer on a sidewall of the polysilicon layer. A drain region of the LDMOS transistor is implanted with a first implant aligned to a first edge formed by the second oxide layer. A second nitride layer is formed conformingly covering the second oxide layer. A nitride etch-stop layer is formed conformingly covering the second nitride layer.