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1SMB120AT3 TVS diode, unidirectional, 120V working peak reverse voltage, 193V clamping voltage, 600W peak power dissipation. Surface mount SMB package.
Mfr Part #:

1SMB120AT3

Available from 2 distributors
Mfr Name: On Semiconductor
On Semiconductor
TVS diode, unidirectional, 120V working peak reverse voltage, 193V clamping voltage, 600W peak power dissipation. Surface mount SMB package.
✓ Total Stock: 2,794 pcs
$ Price Range: $0.21 - $0.26

1SMB120AT3 Available from 2 distributors

✓ Authorised
✓ Non-Authorised
Distributor Stock Pricing MOQ PKG Lead Time Date Code On Order Quantity On Order Delivery
Bristol Electronics ✓
Non-Authorised Inventory information
2,240 pcs
On Request
2240 pcs On Request 1 On Request On Request On Request On Request 2026-04-21 11:15:09
Smaxon Electronics ✓
Non-Authorised Inventory information
554 pcs
On Request
554 pcs On Request 1 On Request On Request 17+ On Request On Request
DistyParts aggregates offers from multiple distributors. Final prices, lead times and terms are subject to the distributors' discretion and may change without prior notice. DistyParts is not liable for any discrepancies.

1SMB120AT3 Specifications Quick View

Most important parameters for selection – full specs in datasheet.
Category
Manufacturer Name
Applications
Capacitance
Capacitance @ Frequency
Current
Lead Style
Medical Grade
Mounting Type
Operating Temperature
Power
Power Line Protection
Response Time
Supplier Device Package
Tape & Reel
Termination Style
Type
Unidirectional Channels
Voltage
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1SMB120AT3 Description

Short technical summary and product information.

The 1SMB120AT3 is a unidirectional transient voltage suppressor (TVS) diode from On Semiconductor, designed to protect sensitive electronics from high voltage transients. It features a working peak reverse voltage of 120V and a clamping voltage of 193V at a peak pulse current of 3.1A. With a peak power dissipation of 600W (1ms pulse), it offers robust protection for general purpose applications.

 

This device is part of the 1SMB5.0AT3 series and is housed in a surface mount DO-214AA (SMB) package. It has a fast response time of less than 1.0 ns and an ESD rating of Class 3 (>16 kV) per Human Body Model. The operating temperature range is -65°C to 150°C.

 

Typical applications include communication systems, automotive electronics, industrial controls, and power supplies. The SMB package is void-free, transfer-molded thermosetting plastic with corrosion-resistant, solderable leads. Polarity is indicated by a cathode band.

1SMB120AT3 Quick Information

Product Type: TVS Diode (Zener)
Series: 1SMB5.0AT3 Series
Canonical Name: 1SMB120AT3 - TVS Diode, Unidirectional, 120V Working Peak Reverse Voltage, 193V Clamping, SMB Package
Subcategory: Unidirectional TVS Diode

1SMB120AT3 Compliance

RoHS Status: RoHS Compliant
Moisture Sensitivity Level (MSL): 1 Unlimited
REACH Status: REACH Unaffected
Lead Free: Pb-Free packages available

1SMB120AT3 Estimated Pricing

Qty Low High
2,500+ $0.26 $0.26
5,000+ $0.24 $0.24
7,500+ $0.23 $0.23
12,500+ $0.22 $0.22
17,500+ $0.21 $0.21
25,000+ $0.21 $0.21

Estimated market price range - modelled values for guidance only, not live distributor offers.

1SMB120AT3 Features

  • 600W peak power dissipation at 1ms.
  • Unidirectional TVS diode with 120V working voltage.
  • Fast response time less than 1.0 ns.
  • ESD rating Class 3 above 16 kV.
  • Surface mount SMB package.

1SMB120AT3 Applications

  • General purpose transient voltage protection.
  • Used in communication systems and automotive.
  • Protects industrial controls and power supplies.
  • Suitable for medical equipment and business machines.

1SMB120AT3 FAQs

7 frequently asked questions generated from this part’s specifications.
What is the working peak reverse voltage of the 1SMB120AT3?

120 V.

What is the clamping voltage?

193 V.

What is the peak pulse current?

3.1 A.

What package does the 1SMB120AT3 come in?

DO-214AA (SMB) surface mount package.

What is the ESD rating?

Class 3 (>16 kV) per Human Body Model.

What is the response time?

Typically less than 1.0 ns.

What is the operating temperature range?

-65°C to 150°C.

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