SMT100-35 Littelfuse, Inc., SMT100-35 Datasheet

SMT100-35

Manufacturer Part Number

SMT100-35

Description

Manufacturer

Littelfuse, Inc.

Datasheet

1.SMT100-35.pdf (3 pages)

Available stocks

Company

Part Number

Manufacturer

Quantity

Price

Company:

Bonase Electronics (HK) Co., Limited

Part Number:

SMT100-35

Manufacturer:

Littelfuse

Quantity:

45 000

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The electrical characteristics of a SMT100 device are similar to

that of a self-gated Triac, but the SMT100 is a two terminal

device with no gate. The gate function is achieved by an

internal current controlled mechanism.

Like the T.V.S. diodes, the SMT100 has a standoff voltage

(Vrm) which should be equal to or greater than the operating

voltage of the system to be protected. At this voltage (Vrm)

the current consumption of the SMT100 is negligible and will

not affect the protected system.

When a transient occurs, the voltage across the SMT100 will

increase until the breakdown voltage (Vbr) is reached. At this

point the device will operate in a similar way to a T.V.S.

device and is in avalanche mode.

The voltage of the transient will now be limited and will only

increase by a few volts as the device diverts more current. As

this transient current rises, a level of current through the

1. When selecting a SMT100 device, it is important

that the Vrm of the device is equal to or greater than

the the operating voltage of the system.

2. The minimum Holding Current (Ih) must be greater

than the current the system is capable of delivering

otherwise the device will remain conducting

following a transient condition.

ELECTRICAL CHARACTERISTICS

SELECTING A SMT100

COMPLIES WITH THE

FOLLOWING STANDARDS

(CCITT) ITU-K20

(CCITT) ITU-K17

VDE0433

VDE0878

IEC-1000-4-5

FCC Part 68, lightning surge

type A

FCC Part 68, lightning surge

type B

Bellcore TR-NWT-001089

first level

Bellcore TR-NWT-001089

second level

CNET I31-24

PEAK SURGE

VOLTAGE

level 3

level 4

1500

1000

1500

2000

2500

1000

5000

1000

800

(V)

WAVEFORM

VOLTAGE

10/1000

1.2/500

0.5/700

10/700

10/160

10/560

1.2/50

9/720

2/10

w w w . l i t t e l f u s e . c o m

(

µS)

WAVEFORM

CURRENT

device is reached (Ibo) which causes the device to switch to a

fully conductive state such that the voltage across the device

is now only a few volts (Vt). The voltage at which the device

switched from the avalanche mode to the fully conductive

state (Vt) is known as the Breakover voltage (Vbo). When the

device is in the Vt state, high currents can be diverted

without damage to the SMT100 due to the low voltage across

the device, since the limiting factor in such devices is

dissipated power (V x I).

Resetting of the device to the non-conducting state is

controlled by the current flowing through the device. When

the current falls below a certain value, known as the Holding

Current (Ih), the device resets automatically.

As with the avalanche T.V.S. device, if the SMT100 is subjected

to a surge current which is beyond its maximum rating, then

the device will fail in short circuit mode, ensuring that the

equipment is ultimately protected.

10/1000

0.8/310

10/160

10/560

V-I Graph illustrating symbols

and terms for the SMT100

surge protection device

5/310

5/320

1/20

8/20

2/10

(

µS)

ADMISSIBLE IPP

100

150

(A)

NECESSARY

RESISTOR

12.5

11.5

6.5

SMT100

Related parts for SMT100-35

SMT100-35 Summary of contents

Page 1

... ELECTRICAL CHARACTERISTICS The electrical characteristics of a SMT100 device are similar to that of a self-gated Triac, but the SMT100 is a two terminal device with no gate. The gate function is achieved by an internal current controlled mechanism. Like the T.V.S. diodes, the SMT100 has a standoff voltage (Vrm) which should be equal to or greater than the operating voltage of the system to be protected ...

Page 2

... Non-repetitive surge peak on-state current F = 50Hz T Maximum lead temperature range L T Storage temperature range stg T Maximum junction temperature j Marking Type Laser B035 SMT100-35 B065 SMT100-65 B120 SMT100-120 SMT100-140 B140 SMT100-200 B200 SMT100-230 B230 B270 SMT100-270 Note 1: Measured @ 1V bias, 1M HZ. All parameters are tested using a FET TEST ...

Page 3

... SMT100 53 ...

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