Onsemi Transient Suppression Devices 2,400+

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Part RoHS Manufacturer Diode Type Terminal Position Terminal Form No. of Terminals Surface Mount Package Shape Package Body Material Working Test Current Config Nominal Reference Voltage Maximum Output Current Maximum Non Repetitive Peak Reverse Power Dissipation Maximum Forward Voltage (VF) Nominal Breakdown Voltage Maximum Reverse Recovery Time Technology Maximum Reverse Current No. of Elements Reverse Test Voltage Package Style (Meter) Sub-Category Maximum Voltage Tolerance Maximum Repetitive Peak Reverse Voltage Maximum Operating Temperature Maximum Dynamic Impedance Minimum Operating Temperature Terminal Finish JESD-30 Code Moisture Sensitivity Level (MSL) Polarity Case Connection Qualification Maximum Power Dissipation Minimum Diode Capacitance Additional Features JEDEC-95 Code Maximum Clamping Voltage Minimum Breakdown Voltage Maximum Non Repetitive Peak Forward Current JESD-609 Code Maximum Time At Peak Reflow Temperature (s) Peak Reflow Temperature (C) Diode Element Material Maximum Breakdown Voltage Reference Standard

NSPM8151MUTBG

Onsemi

TRANS VOLTAGE SUPPRESSOR DIODE

DUAL

NO LEAD

6

YES

RECTANGULAR

PLASTIC/EPOXY

SINGLE

17.5 V

AVALANCHE

1 uA

1

15 V

SMALL OUTLINE

15 V

125 Cel

-55 Cel

MATTE TIN

R-PDSO-N6

1

UNIDIRECTIONAL

27 V

16 V

e3

30

260

SILICON

18.5 V

IEC-61000-4-2; IEC-61000-4-5

1SMC18AT3

Onsemi

TRANS VOLTAGE SUPPRESSOR DIODE

DUAL

C BEND

2

YES

RECTANGULAR

PLASTIC/EPOXY

SINGLE

1500 W

ZENER

1

SMALL OUTLINE

Transient Suppressors

18 V

Tin/Lead (Sn/Pb)

R-PDSO-C2

1

UNIDIRECTIONAL

Not Qualified

.75 W

HIGH RELIABILITY

29.2 V

20 V

e0

30

235

SILICON

22.1 V

UL RECOGNIZED

ICTE-5RLG

Onsemi

TRANS VOLTAGE SUPPRESSOR DIODE

AXIAL

WIRE

2

NO

ROUND

PLASTIC/EPOXY

SINGLE

1500 W

6 V

ZENER

1

LONG FORM

Transient Suppressors

5 V

175 Cel

-65 Cel

O-PALF-W2

UNIDIRECTIONAL

ISOLATED

Not Qualified

5 W

EXCELLENT CLAMPING CAPABILITY, HIGH RELIABILITY, LOW IMPEDANCE

9.4 V

6 V

SILICON

MPTE-45CRL4

Onsemi

TRANS VOLTAGE SUPPRESSOR DIODE

AXIAL

WIRE

2

NO

ROUND

PLASTIC/EPOXY

SINGLE

1500 W

53 V

ZENER

1

LONG FORM

Transient Suppressors

45 V

175 Cel

-65 Cel

TIN LEAD

O-PALF-W2

BIDIRECTIONAL

ISOLATED

Not Qualified

5 W

HIGH RELIABILITY

70 V

52.9 V

e0

SILICON

SMF14AT1

Onsemi

TRANS VOLTAGE SUPPRESSOR DIODE

DUAL

FLAT

2

YES

RECTANGULAR

PLASTIC/EPOXY

SINGLE

1000 W

16.4 V

ZENER

1

SMALL OUTLINE

Transient Suppressors

14 V

TIN

R-PDSO-F2

1

UNIDIRECTIONAL

Not Qualified

.385 W

LOW IMPEDENCE, EXCELLENT CLAMPING CAPABILITY

23.2 V

15.6 V

e3

260

SILICON

17.2 V

SA33ALF

Onsemi

TRANS VOLTAGE SUPPRESSOR DIODE

AXIAL

WIRE

2

NO

ROUND

PLASTIC/EPOXY

SINGLE

500 W

38.65 V

ZENER

1

LONG FORM

Transient Suppressors

33 V

175 Cel

-55 Cel

TIN LEAD

O-PALF-W2

UNIDIRECTIONAL

ISOLATED

Not Qualified

3 W

HIGH RELIABILITY, LOW IMPEDANCE

53.3 V

36.7 V

e0

SILICON

40.6 V

UL RECOGNIZED

MMQA13VT3

Onsemi

TRANS VOLTAGE SUPPRESSOR DIODE

DUAL

GULL WING

6

YES

RECTANGULAR

PLASTIC/EPOXY

COMMON ANODE, 4 ELEMENTS

150 W

13 V

ZENER

4

SMALL OUTLINE

Transient Suppressors

9.8 V

150 Cel

-55 Cel

TIN LEAD

R-PDSO-G6

UNIDIRECTIONAL

Not Qualified

.225 W

18.6 V

12.35 V

e0

235

SILICON

13.65 V

SA22ALFG

Onsemi

TRANS VOLTAGE SUPPRESSOR DIODE

NO

25.65 V

Transient Suppressors

22 V

UNIDIRECTIONAL

35.5 V

SA130CA

Onsemi

TRANS VOLTAGE SUPPRESSOR DIODE

AXIAL

WIRE

2

NO

ROUND

PLASTIC/EPOXY

SINGLE

500 W

ZENER

1

LONG FORM

Transient Suppressors

130 V

TIN LEAD

O-PALF-W2

BIDIRECTIONAL

ISOLATED

Not Qualified

3 W

HIGH RELIABILITY

209 V

144 V

e0

SILICON

159 V

UL RECOGNIZED

1N6302ARL

Onsemi

TRANS VOLTAGE SUPPRESSOR DIODE

AXIAL

WIRE

2

NO

ROUND

PLASTIC/EPOXY

1 mA

SINGLE

180 V

1500 W

AVALANCHE

1

LONG FORM

Voltage Reference Diodes

5 %

175 Cel

-65 Cel

TIN LEAD

O-PALF-W2

UNIDIRECTIONAL

ISOLATED

Not Qualified

5 W

HIGH RELIABILITY, LOW IMPEDANCE

171 V

e0

SILICON

189 V

UL RECOGNIZED

1PMT16AT3

Onsemi

TRANS VOLTAGE SUPPRESSOR DIODE

SINGLE

GULL WING

2

YES

SQUARE

PLASTIC/EPOXY

1 mA

SINGLE

16 V

200 W

ZENER

1

SMALL OUTLINE

Voltage Reference Diodes

5 %

16 V

150 Cel

TIN LEAD

S-PSSO-G2

UNIDIRECTIONAL

CATHODE

Not Qualified

.5 W

DO-216AA

17.8 V

e0

235

SILICON

19.7 V

CM6100

Onsemi

TRANS VOLTAGE SUPPRESSOR DIODE

BOTTOM

BALL

4

YES

SQUARE

PLASTIC/EPOXY

SINGLE

6 V

AVALANCHE

1

GRID ARRAY

Transient Suppressors

S-PBGA-B4

UNIDIRECTIONAL

Not Qualified

LOW CAPACITANCE

9.8 V

6 V

NOT SPECIFIED

NOT SPECIFIED

SILICON

MMQA6V2T3

Onsemi

TRANS VOLTAGE SUPPRESSOR DIODE

DUAL

GULL WING

6

YES

RECTANGULAR

PLASTIC/EPOXY

COMMON ANODE, 4 ELEMENTS

150 W

6.2 V

AVALANCHE

4

SMALL OUTLINE

Transient Suppressors

4 V

150 Cel

-55 Cel

TIN LEAD

R-PDSO-G6

1

UNIDIRECTIONAL

Not Qualified

.225 W

9 V

5.89 V

e0

235

SILICON

6.51 V

MPTE-36RL4

Onsemi

TRANS VOLTAGE SUPPRESSOR DIODE

AXIAL

WIRE

2

NO

ROUND

PLASTIC/EPOXY

SINGLE

1500 W

ZENER

1

LONG FORM

Transient Suppressors

36 V

175 Cel

-65 Cel

TIN LEAD

O-PALF-W2

UNIDIRECTIONAL

ISOLATED

Not Qualified

5 W

EXCELLENT CLAMPING CAPABILITY, HIGH RELIABILITY, LOW IMPEDANCE

54.3 V

42.4 V

e0

SILICON

1PMT48AT1

Onsemi

TRANS VOLTAGE SUPPRESSOR DIODE

SINGLE

GULL WING

2

YES

SQUARE

PLASTIC/EPOXY

1 mA

SINGLE

48 V

175 W

ZENER

1

SMALL OUTLINE

Voltage Reference Diodes

5 %

48 V

150 Cel

TIN LEAD

S-PSSO-G2

1

UNIDIRECTIONAL

CATHODE

Not Qualified

.5 W

DO-216AA

53.3 V

e0

235

SILICON

58.9 V

ICTE-10CRL4

Onsemi

TRANS VOLTAGE SUPPRESSOR DIODE

AXIAL

WIRE

2

NO

ROUND

PLASTIC/EPOXY

SINGLE

1500 W

12 V

ZENER

1

LONG FORM

Transient Suppressors

10 V

175 Cel

-65 Cel

TIN LEAD

O-PALF-W2

BIDIRECTIONAL

ISOLATED

Not Qualified

5 W

HIGH RELIABILITY

14.5 V

11.7 V

e0

SILICON

SA24ALFG

Onsemi

TRANS VOLTAGE SUPPRESSOR DIODE

NO

28.1 V

Transient Suppressors

24 V

UNIDIRECTIONAL

38.9 V

SA78CARL

Onsemi

TRANS VOLTAGE SUPPRESSOR DIODE

AXIAL

WIRE

2

NO

ROUND

PLASTIC/EPOXY

SINGLE

500 W

ZENER

1

LONG FORM

Transient Suppressors

78 V

175 Cel

-55 Cel

TIN LEAD

O-PALF-W2

BIDIRECTIONAL

ISOLATED

Not Qualified

3 W

HIGH RELIABILITY

126 V

86.7 V

e0

SILICON

95.8 V

SA5.0ALFG

Onsemi

TRANS VOLTAGE SUPPRESSOR DIODE

NO

6.7 V

Transient Suppressors

5 V

UNIDIRECTIONAL

9.2 V

SZQA6V8XV5T1G

Onsemi

TRANS VOLTAGE SUPPRESSOR DIODE

DUAL

FLAT

5

YES

RECTANGULAR

PLASTIC/EPOXY

COMMON ANODE, 4 ELEMENTS

100 W

1.3 V

6.8 V

AVALANCHE

.1 uA

4

4.3 V

SMALL OUTLINE

4.3 V

150 Cel

-55 Cel

Tin (Sn)

R-PDSO-F5

1

UNIDIRECTIONAL

.3 W

12.5 V

6.46 V

e3

30

260

SILICON

7.14 V

AEC-Q101, IEC-61000-4-2

NSB12ANT3G

Onsemi

TRANS VOLTAGE SUPPRESSOR DIODE

DUAL

C BEND

2

YES

RECTANGULAR

PLASTIC/EPOXY

SINGLE

600 W

13.75 V

ZENER

1

SMALL OUTLINE

Transient Suppressors

12 V

150 Cel

-65 Cel

TIN

R-PDSO-C2

1

UNIDIRECTIONAL

Not Qualified

.55 W

19.9 V

13.2 V

e3

30

260

SILICON

14.3 V

ICTE-12RL4

Onsemi

TRANS VOLTAGE SUPPRESSOR DIODE

AXIAL

WIRE

2

NO

ROUND

PLASTIC/EPOXY

SINGLE

1500 W

ZENER

1

LONG FORM

Transient Suppressors

12 V

TIN

O-PALF-W2

UNIDIRECTIONAL

ISOLATED

Not Qualified

5 W

EXCELLENT CLAMPING CAPABILITY, HIGH RELIABILITY, LOW IMPEDANCE

16.5 V

14.1 V

e3

260

SILICON

NSPU3061N2T5G

Onsemi

TRANS VOLTAGE SUPPRESSOR DIODE

BOTTOM

NO LEAD

2

YES

RECTANGULAR

PLASTIC/EPOXY

SINGLE

6.9 V

AVALANCHE

1 uA

1

6.3 V

CHIP CARRIER

6.3 V

150 Cel

-65 Cel

NICKEL PALLADIUM GOLD

R-PBCC-N2

1

UNIDIRECTIONAL

110 pF

EXCELLENT CLAMPING CAPABILITY

9.7 V

6.4 V

e4

30

260

SILICON

9.5 V

IEC-61000-4-2, 4-5

TRA2532

Onsemi

TRANS VOLTAGE SUPPRESSOR DIODE

END

NO LEAD

2

YES

ROUND

CERAMIC, METAL-SEALED COFIRED

SINGLE

AVALANCHE

1

DISK BUTTON

Transient Suppressors

23 V

TIN

O-CEDB-N2

UNIDIRECTIONAL

Not Qualified

24 V

e3

260

SILICON

32 V

SA6.5CARL

Onsemi

TRANS VOLTAGE SUPPRESSOR DIODE

AXIAL

WIRE

2

NO

ROUND

PLASTIC/EPOXY

SINGLE

500 W

ZENER

1

LONG FORM

Transient Suppressors

6.5 V

TIN

O-PALF-W2

BIDIRECTIONAL

ISOLATED

Not Qualified

3 W

HIGH RELIABILITY

11.2 V

7.22 V

e3

260

SILICON

7.98 V

ICTE-22RL4

Onsemi

TRANS VOLTAGE SUPPRESSOR DIODE

AXIAL

WIRE

2

NO

ROUND

PLASTIC/EPOXY

SINGLE

1500 W

26 V

ZENER

1

LONG FORM

Transient Suppressors

22 V

175 Cel

-65 Cel

TIN LEAD

O-PALF-W2

UNIDIRECTIONAL

ISOLATED

Not Qualified

5 W

EXCELLENT CLAMPING CAPABILITY, HIGH RELIABILITY, LOW IMPEDANCE

32 V

25.9 V

e0

SILICON

MMQA12VT1G

Onsemi

TRANS VOLTAGE SUPPRESSOR DIODE

DUAL

GULL WING

6

YES

RECTANGULAR

PLASTIC/EPOXY

COMMON ANODE, 4 ELEMENTS

150 W

.9 V

12 V

AVALANCHE

.075 uA

4

9.1 V

SMALL OUTLINE

Transient Suppressors

9.1 V

150 Cel

-55 Cel

MATTE TIN

R-PDSO-G6

1

UNIDIRECTIONAL

Not Qualified

.225 W

17.3 V

11.4 V

e3

30

260

SILICON

12.6 V

SA10ALFG

Onsemi

TRANS VOLTAGE SUPPRESSOR DIODE

NO

11.7 V

Transient Suppressors

10 V

UNIDIRECTIONAL

17 V

NZQA5V6XV5T1

Onsemi

TRANS VOLTAGE SUPPRESSOR DIODE

DUAL

FLAT

5

YES

RECTANGULAR

PLASTIC/EPOXY

COMMON ANODE, 4 ELEMENTS

100 W

5.6 V

AVALANCHE

4

SMALL OUTLINE

Transient Suppressors

TIN

R-PDSO-F5

UNIDIRECTIONAL

Not Qualified

.3 W

10.5 V

5.32 V

e3

260

SILICON

5.88 V

ICTE-18RL4

Onsemi

TRANS VOLTAGE SUPPRESSOR DIODE

AXIAL

WIRE

2

NO

ROUND

PLASTIC/EPOXY

SINGLE

1500 W

ZENER

1

LONG FORM

Transient Suppressors

18 V

TIN

O-PALF-W2

UNIDIRECTIONAL

ISOLATED

Not Qualified

5 W

EXCELLENT CLAMPING CAPABILITY, HIGH RELIABILITY, LOW IMPEDANCE

25.2 V

21.2 V

e3

260

SILICON

CM6114

Onsemi

TRANS VOLTAGE SUPPRESSOR DIODE

YES

10 V

AVALANCHE

Transient Suppressors

UNIDIRECTIONAL

13.5 V

SILICON

NUP1128HT1G

Onsemi

TRANS VOLTAGE SUPPRESSOR DIODE

DUAL

GULL WING

2

YES

RECTANGULAR

PLASTIC/EPOXY

SINGLE

31 V

AVALANCHE

.1 uA

1

26.5 V

SMALL OUTLINE

26.5 V

150 Cel

-55 Cel

MATTE TIN

R-PDSO-G2

1

BIDIRECTIONAL

165 W

55 V

27.5 V

e3

30

260

SILICON

35.5 V

IEC-61000-4-2, 4-4, 4-5; ISO 7637-1, -3

SA51CARL

Onsemi

TRANS VOLTAGE SUPPRESSOR DIODE

AXIAL

WIRE

2

NO

ROUND

PLASTIC/EPOXY

SINGLE

500 W

ZENER

1

LONG FORM

Transient Suppressors

51 V

TIN LEAD

O-PALF-W2

BIDIRECTIONAL

ISOLATED

Not Qualified

3 W

HIGH RELIABILITY

82.4 V

56.7 V

e0

SILICON

62.7 V

UL RECOGNIZED

SA18ALF

Onsemi

TRANS VOLTAGE SUPPRESSOR DIODE

AXIAL

WIRE

2

NO

ROUND

PLASTIC/EPOXY

SINGLE

500 W

21.05 V

ZENER

1

LONG FORM

Transient Suppressors

18 V

175 Cel

-55 Cel

TIN LEAD

O-PALF-W2

UNIDIRECTIONAL

ISOLATED

Not Qualified

3 W

HIGH RELIABILITY, LOW IMPEDANCE

29.2 V

20 V

e0

SILICON

22.1 V

UL RECOGNIZED

VS105E2-TR

Onsemi

TRANS VOLTAGE SUPPRESSOR DIODE

YES

8.5 V

Transient Suppressors

6 V

BIDIRECTIONAL

1PMT51AT1

Onsemi

TRANS VOLTAGE SUPPRESSOR DIODE

SINGLE

GULL WING

2

YES

SQUARE

PLASTIC/EPOXY

1 mA

SINGLE

51 V

175 W

ZENER

1

SMALL OUTLINE

Voltage Reference Diodes

5 %

51 V

150 Cel

TIN LEAD

S-PSSO-G2

1

UNIDIRECTIONAL

CATHODE

Not Qualified

.5 W

DO-216AA

56.7 V

e0

235

SILICON

62.7 V

SMF10AG

Onsemi

TRANS VOLTAGE SUPPRESSOR DIODE

YES

11.7 V

Transient Suppressors

10 V

MATTE TIN

1

UNIDIRECTIONAL

17 V

e3

SA48CA

Onsemi

TRANS VOLTAGE SUPPRESSOR DIODE

AXIAL

WIRE

2

NO

ROUND

PLASTIC/EPOXY

SINGLE

500 W

ZENER

1

LONG FORM

Transient Suppressors

48 V

O-PALF-W2

BIDIRECTIONAL

ISOLATED

Not Qualified

3 W

HIGH RELIABILITY

77.4 V

53.3 V

260

SILICON

58.9 V

UL RECOGNIZED

MMQA18VT3G

Onsemi

TRANS VOLTAGE SUPPRESSOR DIODE

DUAL

GULL WING

6

YES

RECTANGULAR

PLASTIC/EPOXY

COMMON ANODE, 4 ELEMENTS

150 W

18 V

ZENER

4

SMALL OUTLINE

Transient Suppressors

14 V

150 Cel

-55 Cel

MATTE TIN

R-PDSO-G6

UNIDIRECTIONAL

Not Qualified

.225 W

26 V

17.1 V

e3

SILICON

18.9 V

1N6381RL4

Onsemi

TRANS VOLTAGE SUPPRESSOR DIODE

AXIAL

WIRE

2

NO

ROUND

PLASTIC/EPOXY

SINGLE

1500 W

ZENER

1

LONG FORM

Transient Suppressors

45 V

175 Cel

-65 Cel

TIN LEAD

O-PALF-W2

UNIDIRECTIONAL

ISOLATED

Not Qualified

5 W

EXCELLENT CLAMPING CAPABILITY, HIGH RELIABILITY, LOW IMPEDANCE

70 V

52.9 V

e0

SILICON

PACDN042Y3-LF

Onsemi

TRANS VOLTAGE SUPPRESSOR DIODE

TIN

1

e3

30

260

SMF11AT1

Onsemi

TRANS VOLTAGE SUPPRESSOR DIODE

DUAL

FLAT

2

YES

RECTANGULAR

PLASTIC/EPOXY

SINGLE

1000 W

12.85 V

ZENER

1

SMALL OUTLINE

Transient Suppressors

11 V

TIN

R-PDSO-F2

1

UNIDIRECTIONAL

Not Qualified

.385 W

LOW IMPEDENCE, EXCELLENT CLAMPING CAPABILITY

18.2 V

12.2 V

e3

260

SILICON

13.5 V

NSPM6201MUTBG

Onsemi

TRANS VOLTAGE SUPPRESSOR DIODE

DUAL

NO LEAD

3

YES

SQUARE

PLASTIC/EPOXY

SINGLE

AVALANCHE

1 uA

1

20 V

SMALL OUTLINE

20 V

150 Cel

-65 Cel

S-PDSO-N3

BIDIRECTIONAL

39 V

21 V

SILICON

27 V

IEC-61000-4-2, 4-5

HVL2021RP

Onsemi

TRANS VOLTAGE SUPPRESSOR DIODE

UPPER

NO LEAD

1

YES

SQUARE

UNSPECIFIED

SINGLE

ZENER

.5 uA

1

14 V

UNCASED CHIP

150 Cel

-40 Cel

S-XUUC-N1

BIDIRECTIONAL

22 V

SILICON

AEC-Q101

NSPM0101MUT5G

Onsemi

TRANS VOLTAGE SUPPRESSOR DIODE

BOTTOM

NO LEAD

2

YES

RECTANGULAR

PLASTIC/EPOXY

SINGLE

AVALANCHE

.5 uA

1

10 V

CHIP CARRIER

10 V

150 Cel

-65 Cel

NICKEL GOLD PALLADIUM

R-PBCC-N2

1

UNIDIRECTIONAL

20 V

12 V

30

260

SILICON

IEC-61000-4-2, 4-5

1PMT26AT1

Onsemi

TRANS VOLTAGE SUPPRESSOR DIODE

SINGLE

GULL WING

2

YES

SQUARE

PLASTIC/EPOXY

1 mA

SINGLE

26 V

200 W

ZENER

1

SMALL OUTLINE

Voltage Reference Diodes

5 %

26 V

150 Cel

TIN LEAD

S-PSSO-G2

1

UNIDIRECTIONAL

CATHODE

Not Qualified

.5 W

DO-216AA

28.9 V

e0

235

SILICON

31.9 V

SA7.5ALFG

Onsemi

TRANS VOLTAGE SUPPRESSOR DIODE

NO

8.77 V

Transient Suppressors

7.5 V

UNIDIRECTIONAL

12.9 V

TVS8501V5MUT5G

Onsemi

TRANS VOLTAGE SUPPRESSOR DIODE

DUAL

NO LEAD

2

YES

RECTANGULAR

PLASTIC/EPOXY

SINGLE

7 V

AVALANCHE

.1 uA

1

5 V

CHIP CARRIER

5 V

150 Cel

-65 Cel

NICKEL GOLD PALLADIUM

R-PBCC-N2

1

UNIDIRECTIONAL

11.5 V

6 V

30

260

SILICON

9 V

IEC-61000-4-2, 4-5

Transient Suppression Devices

Transient suppression devices are electronic components used to protect electronic circuits from voltage spikes and surges that can damage or destroy sensitive components. These voltage transients can be caused by lightning strikes, power surges, electrostatic discharge, or electromagnetic interference.

Transient suppression devices work by providing a low-impedance path for the transient current to flow to ground, diverting the energy away from the sensitive components. There are several types of transient suppression devices, including:

1. Varistors: Varistors are voltage-dependent resistors that provide a high resistance under normal operating conditions, but a low resistance under high-voltage transient conditions. They are commonly used in power supplies, motor controls, and lighting systems.

2. Metal oxide semiconductor field-effect transistors (MOSFETs): MOSFETs are used as voltage clamps to limit the voltage to a safe level during transient events. They are commonly used in automotive electronics and power supplies.

3. TVS diodes: TVS (transient voltage suppressor) diodes are used to protect electronic circuits from voltage spikes and surges by providing a low-impedance path to ground. They are commonly used in telecommunications, power supplies, and automotive electronics.

4. Gas discharge tubes: Gas discharge tubes (GDTs) are used to protect electronic circuits from high-voltage surges by ionizing a gas within the tube to provide a low-impedance path to ground. They are commonly used in telecommunications and power systems.

Transient suppression devices come in different package sizes and current ratings, depending on the application and the required performance. They can be integrated into a circuit board or mounted in a separate enclosure, depending on the application and the space available.