Difference between Holding Currents and Latching Currents in SCR

Difference between holding and latching currents in IV characteristics of SCR

1. The latching current is important only at the time of SCR turn on, whereas holding current is important only at the time of SCR turn off.
2. If the anode current goes below the holding current then the conducting SCR turns off. The holding current is defined for I_G = 0, whereas if anode current at the time of turn on is higher than latching current then only SCR will latch into its on state.
3. If I_A < I_Lthen SCR does not latch. It will remain on as long as I_G, is being supplied. As soon as I_G is removed, SCR will turn off.
4. Latching current is always higher than the holding current.
5. The values of I_L and I_H are constant. They do not depend on the gate current magnitude.