DIACs

The acronym DIAC is short for “diode for alternating current”. A DIAC is a semiconductor switch that can be turned on in both forward and reverse polarities (full-wave or bi-directional). DIACS are also called "symmetrical trigger diodes".

What is the function of a DIAC?

A DIAC works by introducing a voltage, in either direction. A ’break over point’ is then reached when the device enters a negative resistance region. This will remain in a low resistant state until the current applied reduces below its holding value.

Most DIACs have a three-layer structure with break over voltage of approximately 30 V. Their behaviour is similar to that of a neon lamp, but it can be more precisely controlled and takes place at a lower voltage.

Features and benefits:

  • Lightweight
  • Compact and smalL
  • Varying maximum break over voltage available
  • Surface/Through-hole mounts available
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Rincian Komponen Brand Stock Maximum Breakover Current Maximum Breakover Voltage Maximum Holding Current Repetitive Peak Forward Blocking Voltage Repetitive Peak On-State Current Repetitive Peak Off-State Current Mounting Type Package Type Pin Count Dimensions Length Width Height Maximum Operating Temperature
STMicroelectronics DB3 DIAC 36V, 2A, 2-Pin DO-35 STMicroelectronics 2800 0.05mA 36V - - 2A 0.01mA Through Hole DO-35 2 4.5 x 2 x 2mm 4.5mm 2mm 2mm +125 °C
Bourns TISP4500H3BJR-S Thyristor 500V, 2A, 2-Pin SMB
  • S$ 0,86
  • Each (In a Pack of 25)
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Bourns 2325 - 500V - ±350V 2A ±10µA Surface Mount SMB 2 4.57 x 3.94 x 2.237mm 4.57mm 3.94mm 2.237mm +150 °C
STMicroelectronics DB3TG DIAC 34V, 2A, 2-Pin DO-35 STMicroelectronics 1150 0.015mA 34V - - 2A 0.01mA Through Hole DO-35 2 4.5 x 2 x 2mm 4.5mm 2mm 2mm +125 °C
STMicroelectronics DB4 DIAC 45V, 2A, 2-Pin DO-35 STMicroelectronics 1050 - 45V - - 2A - Through Hole DO-35 2 2 (Dia) x 4.5mm 4.5mm 2 (Dia.)mm - +125 °C
STMicroelectronics SMDB3 DIAC 36V, 1A, 3-Pin SOT-23 STMicroelectronics 320 0.01mA 36V - - 1A 0.01mA Surface Mount SOT-23 3 2.9 x 1.3 x 0.95mm 2.9mm 1.3mm 0.95mm +125 °C
Bourns TISP4350T3BJR-S Thyristor 350V, 2.1A, 2-Pin SMB
  • S$ 0,544
  • Each (On a Reel of 3000)
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Bourns 0 - 350V 150mA ±275V 2.1A ±10µA Surface Mount SMB 2 4.57 x 3.94 x 2.237mm 4.57mm 3.94mm 2.237mm +150 °C
Bourns TISP4350T3BJR-S Thyristor 350V, 2.1A, 2-Pin SMB
  • S$ 0,688
  • Each (In a Pack of 25)
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Bourns 0 - 350V 150mA ±275V 2.1A ±10µA Surface Mount SMB 2 4.57 x 3.94 x 2.237mm 4.57mm 3.94mm 2.237mm +150 °C
Bourns TISP4500H3BJR-S Thyristor 500V, 2A, 2-Pin SMB
  • S$ 0,708
  • Each (On a Reel of 3000)
  • Compare
Bourns 0 - 500V - ±350V 2A ±10µA Surface Mount SMB 2 4.57 x 3.94 x 2.237mm 4.57mm 3.94mm 2.237mm +150 °C
Bourns TISP4C350H3BJR-S Thyristor 350V, 2.1A, 2-Pin SMB
  • S$ 0,544
  • Each (On a Reel of 3000)
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Bourns 0 - 350V 600mA ±275V 2.1A ±10µA Surface Mount SMB 2 4.57 x 3.94 x 2.237mm 4.57mm 3.94mm 2.237mm +150 °C
Bourns TISP4C350H3BJR-S Thyristor 350V, 2.1A, 2-Pin SMB
  • S$ 0,913
  • Each (In a Pack of 25)
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Bourns 0 - 350V 600mA ±275V 2.1A ±10µA Surface Mount SMB 2 4.57 x 3.94 x 2.237mm 4.57mm 3.94mm 2.237mm +150 °C
STMicroelectronics DB3 DIAC 36V, 2A, 2-Pin DO-35
  • S$ 0,088
  • Each (On a Reel of 5000)
  • Compare
STMicroelectronics 0 0.05mA 36V - - 2A 0.01mA Through Hole DO-35 2 4.5 x 2 x 2mm 4.5mm 2mm 2mm +125 °C
STMicroelectronics DB3TG DIAC 34V, 2A, 2-Pin DO-35
  • S$ 0,063
  • Each (On a Reel of 5000)
  • Compare
STMicroelectronics 0 0.015mA 34V - - 2A 0.01mA Through Hole DO-35 2 4.5 x 2 x 2mm 4.5mm 2mm 2mm +125 °C
STMicroelectronics DB4 DIAC 45V, 2A, 2-Pin DO-35
  • S$ 0,048
  • Each (On a Reel of 5000)
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STMicroelectronics 0 - 45V - - 2A - Through Hole DO-35 2 2 (Dia) x 4.5mm 4.5mm 2 (Dia.)mm - +125 °C
STMicroelectronics SMDB3 DIAC 36V, 1A, 3-Pin SOT-23
  • S$ 0,14
  • Each (On a Reel of 3000)
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STMicroelectronics 0 0.01mA 36V - - 1A 0.01mA Surface Mount SOT-23 3 2.9 x 1.3 x 0.95mm 2.9mm 1.3mm 0.95mm +125 °C
STMicroelectronics TMMDB3 DIAC 36V, 2A, 2-Pin MiniMELF STMicroelectronics 0 0.05mA 36V - - 2A 0.01mA Surface Mount MiniMELF 2 3.4 x 1.62 x 1.62mm 3.4mm 1.62mm 1.62mm +125 °C
STMicroelectronics TMMDB3 DIAC 36V, 2A, 2-Pin MiniMELF
  • S$ 0,09
  • Each (On a Reel of 2500)
  • Compare
STMicroelectronics 0 0.05mA 36V - - 2A 0.01mA Surface Mount MiniMELF 2 3.4 x 1.62 x 1.62mm 3.4mm 1.62mm 1.62mm +125 °C
STMicroelectronics TMMDB3TG DIAC 36V, 2A, 2-Pin MiniMELF
  • S$ 0,13
  • Each (On a Reel of 2500)
  • Compare
STMicroelectronics 0 0.05mA 36V - - 2A 0.01mA Surface Mount MiniMELF 2 3.4 x 1.62 x 1.62mm 3.4mm 1.62mm 1.62mm +125 °C
STMicroelectronics TMMDB3TG DIAC 36V, 2A, 2-Pin MiniMELF STMicroelectronics 0 0.05mA 36V - - 2A 0.01mA Surface Mount MiniMELF 2 3.4 x 1.62 x 1.62mm 3.4mm 1.62mm 1.62mm +125 °C
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