AN9768 Datasheet, PDF (5/8 Pages) Littelfuse – Transient Suppression Devices and Principles

Application Note 9768
TABLE 2. CHARACTERISTICS AND FEATURES OF TRANSIENT VOLTAGE SUPPRESSOR TECHNOLOGY
V-I CHARACTERISTICS
DEVICE
TYPE
LEAK-
AGE
FOLLOW
ON I
ENERGY
CLAMPING CAPABIL- CAPACI-
VOLTAGE
ITY
TANCE
RE-
SPONSE
TIME
COST
V
CLAMPING VOLTAGE
Ideal Device Zero
No
To
Low
Low
High
Low
Fast
Low
Or
High
WORKING VOLTAGE
TRANSIENT CURRENT ^I
V
Zinc Oxide Low
No
Moderate To High Moderate
Fast
Low
Varistor
Low
To
High
WORKING
VOLTAGE
I
V
Zener
Low
No
Low
Low
Low
Fast
High
MAX I LIMIT
WORKING
VOLTAGE
I
V _{PEAK VOLTAGE}
(IGNITION)
Crowbar
Low
Yes
Low
(Zener - SCR
(Latching
Combination)
Holding I)
WORKING
VOLTAGE
Medium
Low
Fast Moderate
I
V
PEAK VOLTAGE
(IGNITION)
Spark
Zero
Yes
High
High
Low
Slow
Low
Gap
Ignition
To
Voltage
High
WORKING
VOLTAGE
Low Clamp
I
V _{PEAK VOLTAGE}
(IGNITION)
Triggered Zero
Yes
Spark
Gap
Lower
Ignition
Voltage
High
Low Moderate Moderate
WORKING
VOLTAGE
I
Low
Clamp
V
Selenium
Very
No
Moderate Moderate High
Fast
High
High
To
To
High
High
WORKING
VOLTAGE
I
V
Silicon
High
No
High
High
High
Fast
Low
Carbide
Varistor
WORKING
VOLTAGE
I
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