Raychem Circuit Protection

4

Note: The voltage current (V-I) is useful in depicting the electrical characteristics of the SiBar thyristor surge protectors in relation to each other.

Table V3. Parameter Definitions for SiBar Thyristor Surge Protectors

Symbol

Parameter

Definition

V

BO

Breakover voltage

Maximum voltage across the device at breakdown measured under a

specified voltage and current rate of rise.

I

BO

Breakover current

Instantaneous current flowing at the breakover voltage (V

BO

).

I

H

Hold current

Minimum current required to maintain the device in the on-state.

I

T

On-state current

Current through the device in the on-state condition.

V

T

On-state voltage

Voltage across the device in the on-state condition at a specified current (I

T

).

V

DM

Maximum off-state

Maximum DC voltage that can be applied to the device while maintaining

voltage

it in the off-state condition.

I

DM

Off-state current

Maximum DC value of current that results from the application of the maximum

off-state voltage.

I

pp

Peak pulse current

Rated peak pulse current of specified amplitude and waveshape

that may be applied without damage.

di/dt, dv/dt

Critical rate of rise of

Maximum current and voltage rate of rise the device can withstand without damage.

on-state current and voltage

V

DM

V

BO

V

T

I

DM

I

BO

I

H

I

T

I

PP

I

V

Figure V1. Voltage-Current Characteristics