SCR triggering terminology The minimum gate current that reliably turns on an SCR under specified conditions is called:

Introduction / Context:
Accurate terminology for SCR parameters is crucial for gate-drive design and interpreting data sheets.

Given Data / Assumptions:

• Standard SCR parameters: I_GT (gate trigger current), I_H (holding current), V_BO or I_BO (breakover), etc.
• Turn-on achieved via gate injection at specified junction temperature and anode-cathode voltage.

Concept / Approach:

Gate trigger current (I_GT) is the minimum gate current that causes the SCR to switch from the forward-blocking state to the on-state under specified conditions. This is distinct from holding current I_H, the minimum anode current required to keep the SCR latched after turn-on.

Step-by-Step Solution:

Verification / Alternative check:

Manufacturers specify I_GT across quadrants, temperature, and dv/dt; it is the design basis for gate drive amplitude.

Why Other Options Are Wrong:

Holding current relates to maintaining conduction; breakover current pertains to turning on without gate via exceeding breakover; “junction current” is not a standard parameter name.

Common Pitfalls:

Confusing trigger current with latching or holding currents; designing a gate drive too close to I_GT without margin.

Final Answer:

Trigger current