
AN1001
Application Notes
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AN1001 - 6
2002 Teccor Electronics
Thyristor Product Catalog
Critical Rate-of-rise of Off-state Voltage or Static dv/dt
(dv/dt) – 
Minimum value of the rate-of-rise of principal voltage 
which will cause switching from the off state to the on state
Critical Rate-of-rise of On-state Current (di/dt) – 
Maximum 
value of the rate-of-rise of on-state current that a thyristor can 
withstand without harmful effect
Gate-controlled Turn-on Time
(t
) – 
Time interval between a 
specified point at the beginning of the gate pulse and the instant 
when the principal voltage (current) has dropped to a specified 
low value (or risen to a specified high value) during switching of a 
thyristor from off state to the on state by a gate pulse.
Gate Trigger Current (I
GT
) – 
Minimum gate current required to 
maintain the thyristor in the on state
Gate Trigger Voltage (V
GT
) – 
Gate voltage required to produce 
the gate trigger current
Holding Current (I
)
 – 
Minimum principal current required to 
maintain the thyristor in the on state
Latching Current (I
L
) – 
Minimum principal current required to 
maintain the thyristor in the on state immediately after the switch-
ing from off state to on state has occurred and the triggering sig-
nal has been removed
On-state Current (I
T
) – 
Principal current when the thyristor is in 
the on state
On-state Voltage (V
T
) – 
Principal voltage when the thyristor is in 
the on state
Peak Gate Power Dissipation (P
GM
) – 
Maximum power which 
may be dissipated between the gate and main terminal 1 (or 
cathode) for a specified time duration
Repetitive Peak Off-state Current (I
DRM
) – 
Maximum instanta-
neous value of the off-state current that results from the applica-
tion of repetitive peak off-state voltage
Repetitive Peak Off-state Voltage (V
DRM
) – 
Maximum instanta-
neous value of the off-state voltage which occurs across a thyris-
tor, including all repetitive transient voltages and excluding all 
non-repetitive transient voltages
Repetitive Peak Reverse Current of an SCR (I
RRM
) – 
Maximum 
instantaneous value of the reverse current resulting from the 
application of repetitive peak reverse voltage
Repetitive Peak Reverse Voltage of an SCR (V
RRM
) – 
Maximum 
instantaneous value of the reverse voltage which occurs across 
the thyristor, including all repetitive transient voltages and exclud-
ing all non-repetitive transient voltages
Surge (Non-repetitive) On-state Current (I
) – 
On-state cur-
rent of short-time duration and specified waveshape
Thermal Resistance, Junction to Ambient (R
θ
JA
) – 
Temperature 
difference between the thyristor junction and ambient divided by 
the power dissipation causing the temperature difference under 
conditions of thermal equilibrium
Note: Ambient is the point at which temperature does not change 
as the result of dissipation.
Thermal Resistance, Junction to Case (R
θ
) – 
Temperature dif-
ference between the thyristor junction and the thyristor case 
divided by the power dissipation causing the temperature differ-
ence under conditions of thermal equilibrium