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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Description Price Maximum Breakover Current Maximum Breakover Voltage Peak On-State 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
RS Stock No. 108-132
Mfr. Part No.DB3
£0.406
Each (In a Pack of 5)
Units
0.05mA 36V - - - 2A 0.01mA Through Hole DO-35 2 4.5 x 2 x 2mm 4.5mm 2mm 2mm
RS Stock No. 919-6497
Mfr. Part No.DB3
£0.061
Each (On a Reel of 5000)
Units
0.05mA 36V - - - 2A 0.01mA Through Hole DO-35 2 4.5 x 2 x 2mm 4.5mm 2mm 2mm
RS Stock No. 714-0521
Mfr. Part No.DB3TG
£0.256
Each (In a Pack of 25)
Units
0.015mA 34V - - - 2A 0.01mA Through Hole DO-35 2 4.5 x 2 x 2mm 4.5mm 2mm 2mm
RS Stock No. 168-6788
Mfr. Part No.DB3TG
£0.077
Each (On a Reel of 5000)
Units
0.015mA 34V - - - 2A 0.01mA Through Hole DO-35 2 4.5 x 2 x 2mm 4.5mm 2mm 2mm
RS Stock No. 165-5671
Mfr. Part No.DB4
£0.088
Each (On a Reel of 5000)
Units
- 45V - - - 2A - Through Hole DO-35 2 2 (Dia) x 4.5mm 4.5mm 2 (Dia.)mm -
RS Stock No. 829-0692
Mfr. Part No.DB4
£0.097
Each (In a Pack of 25)
Units
- 45V - - - 2A - Through Hole DO-35 2 2 (Dia) x 4.5mm 4.5mm 2 (Dia.)mm -
RS Stock No. 687-0965
Mfr. Part No.SMDB3
£0.371
Each (In a Pack of 20)
Units
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
RS Stock No. 165-7499
Mfr. Part No.SMDB3
£0.149
Each (On a Reel of 3000)
Units
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
RS Stock No. 687-0971
Mfr. Part No.TMMDB3TG
£0.389
Each (In a Pack of 20)
Units
0.05mA 36V - - - 2A 0.01mA Surface Mount MiniMELF 2 3.4 x 1.62 x 1.62mm 3.4mm 1.62mm 1.62mm
RS Stock No. 168-6657
Mfr. Part No.TMMDB3TG
£0.155
Each (On a Reel of 2500)
Units
0.05mA 36V - - - 2A 0.01mA Surface Mount MiniMELF 2 3.4 x 1.62 x 1.62mm 3.4mm 1.62mm 1.62mm
RS Stock No. 687-0975
Mfr. Part No.TMMDB3
£0.363
Each (In a Pack of 20)
Units
0.05mA 36V - - - 2A 0.01mA Surface Mount MiniMELF 2 3.4 x 1.62 x 1.62mm 3.4mm 1.62mm 1.62mm
RS Stock No. 165-7439
Mfr. Part No.TMMDB3
£0.146
Each (On a Reel of 2500)
Units
0.05mA 36V - - - 2A 0.01mA Surface Mount MiniMELF 2 3.4 x 1.62 x 1.62mm 3.4mm 1.62mm 1.62mm
RS Stock No. 773-4640
Mfr. Part No.TISP4350T3BJR-S
BrandBourns
£0.487
Each (In a Pack of 25)
Units
- 350V ±3V 150mA ±275V 2.1A ±10µA Surface Mount SMB 2 4.57 x 3.94 x 2.237mm 4.57mm 3.94mm 2.237mm
RS Stock No. 165-3040
Mfr. Part No.TISP4350T3BJR-S
BrandBourns
£0.251
Each (On a Reel of 3000)
Units
- 350V ±3V 150mA ±275V 2.1A ±10µA Surface Mount SMB 2 4.57 x 3.94 x 2.237mm 4.57mm 3.94mm 2.237mm
RS Stock No. 773-4659
Mfr. Part No.TISP4500H3BJR-S
BrandBourns
£0.178
Each (In a Pack of 25)
Units
- 500V - - ±350V 2A ±10µA Surface Mount SMB 2 4.57 x 3.94 x 2.237mm 4.57mm 3.94mm 2.237mm
RS Stock No. 165-3044
Mfr. Part No.TISP4500H3BJR-S
BrandBourns
£0.178
Each (On a Reel of 3000)
Units
- 500V - - ±350V 2A ±10µA Surface Mount SMB 2 4.57 x 3.94 x 2.237mm 4.57mm 3.94mm 2.237mm
RS Stock No. 773-4652
Mfr. Part No.TISP4C350H3BJR-S
BrandBourns
£0.57
Each (In a Pack of 25)
Units
- 350V ±3V 600mA ±275V 2.1A ±10µA Surface Mount SMB 2 4.57 x 3.94 x 2.237mm 4.57mm 3.94mm 2.237mm
RS Stock No. 165-3042
Mfr. Part No.TISP4C350H3BJR-S
BrandBourns
£0.307
Each (On a Reel of 3000)
Units
- 350V ±3V 600mA ±275V 2.1A ±10µA Surface Mount SMB 2 4.57 x 3.94 x 2.237mm 4.57mm 3.94mm 2.237mm
RS Stock No. 2508957342
Mfr. Part No.NTE6408
£0.90
Each
Units
- - - - - - - - - - - - - -
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