AC12FSM datasheet(179/223 Pages) TECCOR

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AN1008 - 1

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Thyristor Product Catalog

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Explanation of Maximum Ratings and

Characteristics for Thyristors

Introduction

Data sheets for SCRs and triacs give vital information regarding

maximum ratings and characteristics of thyristors. If the maxi-

mum ratings of the thyristors are surpassed, possible irrevers-

ible damage may occur. The characteristics describe various

pertinent device parameters which are guaranteed as either min-

imums or maximums. Some of these characteristics relate to the

ratings but are not ratings in themselves. The characteristic does

not define what the circuit must provide or be restricted to, but

defines the device characteristic. For example, a minimum value

is indicated for the dv/dt because this value depicts the guaran-

teed worst-case limit for all devices of the specific type. This min-

imum dv/dt value represents the maximum limit that the circuit

should allow.

Maximum Ratings

VRRM: Peak Repetitive Reverse Voltage — SCR

The peak repetitive reverse voltage rating is the maximum peak

reverse voltage that may be continuously applied to the main ter-

minals (anode, cathode) of an SCR. (Figure AN1008.1) An open-

gate condition and gate resistance termination is designated for

this rating. An increased reverse leakage can result due to a pos-

itive gate bias during the reverse voltage exposure time of the

SCR. The repetitive peak reverse voltage rating relates to case

temperatures up to the maximum rated junction temperature.

Figure AN1008.1

V-I Characteristics of SCR Device

VDRM: Peak Repetitive Forward (Off-state) Voltage

SCR

The peak repetitive forward (off-state) voltage rating (Figure

AN1008.1) refers to the maximum peak forward voltage which

may be applied continuously to the main terminals (anode, cath-

ode) of an SCR. This rating represents the maximum voltage the

SCR should be required to block in the forward direction. The

SCR may or may not go into conduction at voltages above the

VDRM rating. This rating is specified for an open-gate condition

and gate resistance termination. A positive gate bias should be

avoided since it will reduce the forward-voltage blocking capabil-

ity. The peak repetitive forward (off-state) voltage rating applies

for case temperatures up to the maximum rated junction temper-

ature.

Triac

The peak repetitive off-state voltage rating should not be sur-

passed on a typical, non-transient, working basis. (Figure

AN1008.2) VDRM should not be exceeded even instantaneously.

This rating applies for either positive or negative bias on main

terminal 2 at the rated junction temperature. This voltage is less

than the minimum breakover voltage so that breakover will not

occur during operation. Leakage current is controlled at this volt-

age so that the temperature rise due to leakage power does not

contribute significantly to the total temperature rise at rated cur-

rent.

Figure AN1008.2

V-I Characteristics of Triac Device

Reverse

Breakdown

Voltage

Forward

Breakover

Voltage

Specified Minimum

Off - State

Blocking

Voltage (VDRM)

-I

-V

Minimum Holding

Current (IH)

Voltage Drop (VT) at

Specified Current (iT)

Latching Current (IL)

Off - State Leakage

Current - (IDRM) at

Specified VDRM

Specified Minimum

Reverse Blocking

Voltage (VRRM)

Reverse Leakage

Current - (IRRM) at

Specified VRRM

Breakover

Voltage

Specified Minimum

Off-state

Blocking

Voltage (VDRM)

-I

-V

Minimum Holding

Current (IH)

Voltage Drop (VT) at

Specified Current (iT)

Latching Current (IL)

Off-state Leakage

Current – (IDRM) at

Specified VDRM

AN1008

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