The 1N4937GP is a 600V, 1A fast recovery rectifier diode in a DO-41 through-hole package. It features a 150ns reverse recovery time and low forward voltage drop.
The 1N4937 is a 600V, 1A fast recovery rectifier diode from ON Semiconductor. It features a 150ns reverse recovery time and is housed in a DO-41 axial lead package.