NP0720SDMCT3G View Datasheet(PDF) - ON Semiconductor

Part Name

Description

Manufacturer

NP0720SDMCT3G

High Current TSPD

ON Semiconductor 

NP−SDMC Series

ELECTRICAL PARAMETER/RATINGS DEFINITIONS

Symbol

Parameter

VDRM

V(BO)

IDRM

I(BO)

IH

VT

IT

ITSM

IPPS

VD

ID

Repetitive Peak Off−state Voltage

Breakover Voltage

Off−state Current

Breakover Current

Holding Current

On−state Voltage

On−state Current

Nonrepetitive Peak On−state Current

Nonrepetitive Peak Impulse Current

Off−state Voltage

Off−state Current

100

−Voltage

+I

IPPS

ITSM

IT

IH

ID

I(BO)

VT

Off−State Region

V(BO)

VDRM

VD

+Voltage

IDRM

−I

Figure 1. Voltage Current Characteristics of TSPD

tr = rise time to peak value

100

Peak

Value

tf = decay time to half value

10

50

Half Value

1

0.1

1

10

100

1000

CURRENT DURATION (s)

Figure 2. Nonrepetitive On−State Current vs. Time

(ITSM)

0

0 tr

tf

TIME (ms)

Figure 3. Nonrepetitive On−State Impulse vs.

Waveform (IPPS)

Detailed Operating Description

The TSPD or Thyristor Surge Protection Device are

specialized silicon based overvoltage protectors, used to

protect sensitive electronic circuits from damaging

overvoltage transient surges caused by induced lightning

and powercross conditions.

The TSPD protects by switching to a low on state voltage

when the specified protection voltage is exceeded. This is

known as a “crowbar” effect. When an overvoltage occurs,

the crowbar device changes from a high−impedance to a

low−impedance state. This low−impedance state then offers

a path to ground, shunting unwanted surges away from the

sensitive circuits.

This crowbar action defines the TSPD’s two states of

functionality: Open Circuit and Short Circuit.

Open Circuit – The TSPD must remain transparent during

normal circuit operation. The device looks like an open

across the two wire line.

Short Circuit – When a transient surge fault exceeds the

TSPD protection voltage threshold, the devices switches on,

and shorts the transient to ground, safely protecting the

circuit.

+ I(OP)

V(OP) TSPD

−

+

Protected

Equipment

−

STSPD looks like an open

SCircuit operates normally

Normal Circuit Operation

+I(Fault)

V(Fault) TSPD

−

SFault voltage greater than Vbo occurs

+

STSPD shorts fault to ground

I(Fault) Protected

SAfter short duration events the O/V

switches back to an open condition

Equipment SWorst case (Fail/Safe)

−

SO/V permanent short

Operation during a Fault

SEquipment protected

Figure 4. Normal and Fault Conditions

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