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SMDB3 The SMDB3 is a DIAC from STMicroelectronics with a breakover voltage range of 28-36V and a current rating of 1A. It is supplied in a SOT-23-3 package.
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SMDB3

Available from 5 distributors
Mfr Name: STMicroelectronics
STMicroelectronics
The SMDB3 is a DIAC from STMicroelectronics with a breakover voltage range of 28-36V and a current rating of 1A. It is supplied in a SOT-23-3 package.
✓ Total Stock: 237,637 pcs
$ Price Range: $2.71

SMDB3 Available from 5 distributors

✓ Authorised
✓ Non-Authorised
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.

SMDB3 Specifications Quick View

Most important parameters for selection – full specs in datasheet.
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Manufacturer Name
Current
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Operating Temperature
Output Voltage
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SMDB3 Description

Short technical summary and product information.

The STMicroelectronics SMDB3 is a DIAC component designed for use in trigger diode applications. It features a breakover voltage typically around 32V, with a range of 28V to 36V, and a maximum repetitive peak on-state current of 1A.

 

This DIAC is housed in a compact SOT-23-3 surface-mount package, making it suitable for automated assembly processes and space-constrained designs. The operating temperature range is -40°C to 125°C.

 

Functioning as a fixed voltage reference, the SMDB3 series can be integrated into simplified gate control circuits for triacs or serve as a starting element in fluorescent lamp ballasts. Its low breakover current and symmetrical breakover characteristics are key electrical features.

SMDB3 Quick Information

Product Type: DIAC
Series: SMDB3
Canonical Name: SMDB3 DIAC
Subcategory: Thyristors - DIACs, SIDACs

SMDB3 Compliance

RoHS Status: RoHS Compliant
Moisture Sensitivity Level (MSL): 1 Unlimited
REACH Status: REACH Unaffected

SMDB3 Estimated Pricing

Qty Low High
1+ $2.71 $2.71

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

SMDB3 Features

  • DIAC with 28-36V breakover voltage.
  • 1A repetitive peak on-state current.
  • SOT-23-3 surface-mount package.
  • Operates from -40°C to 125°C.
  • Suitable for triac gate control.

SMDB3 Applications

  • Triggering triacs in AC phase control circuits.
  • Suitable for dimmer and motor speed control.
  • Used in switching and pulse generation circuits.
  • Ideal for compact surface-mount designs.

SMDB3 FAQs

7 frequently asked questions generated from this part’s specifications.
What is the breakover voltage range for the SMDB3?

The breakover voltage ranges from 28V to 36V with a typical value of 32V at 22nF.

What is the package type of the SMDB3?

It comes in a SOT-23-3 surface-mount package.

What is the operating temperature range?

The operating junction temperature range is -40°C to 125°C.

What is the peak current rating?

The minimum peak gate current is 1A.

What is the leakage current?

Maximum leakage current is 1µA at half the maximum breakover voltage.

What is the output voltage?

The minimum output voltage is 10V at 20Ω load.

What is the rise time?

Maximum rise time is 0.5µs.

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