Comments on: Have You Seen A Diac Before?

By: Jestine Yong

Jestine Yong — Tue, 27 Dec 2022 13:11:42 +0000

Hi Cristiano,

Both are different kind of components serving different function with different breakdown voltage. Use the exact replacement to avoid unnecessary issue.

Jestine

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By: Cristiano

Cristiano — Sun, 25 Dec 2022 22:01:24 +0000

Hi, can I use a bidirecional TVS diode as a diac?

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By: Richard Print

Richard Print — Thu, 05 Aug 2021 07:16:52 +0000

In your top picture with a blue band around it. What is the rating of it? How does it compare with an ST2 Diac? What ratings are DB3, DB4, DB6 Diac? Thank you.

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By: Casey

Casey — Sun, 16 Feb 2020 03:10:51 +0000

In reply to sagie.

That sounds more like a heat sensor in the transmission oil

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By: sagie

sagie — Sat, 25 May 2019 07:28:46 +0000

i have seen many of these wire harness replaced and only fault is diac. This part is fitted inside a car transmission and runs in hot transmission oil, The car is obviously 12 volt but the connections are run inside a computer box of the car so how do i test. Can i connect voltmeter on the circuit of the diac to see what voltage it runs. and if i see what voltage runs on that circuit, how do i determine what diac to buy. Also i noticed when connecting meter to both sides of diac, i get reading of about 5,9 Kohms, then when applying heat gun to it, it chages dratiscally

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By: Ulises Aguilar Pazzani

Ulises Aguilar Pazzani — Tue, 22 Aug 2017 05:21:04 +0000

Yes good infor Mr Yong Diac DB3-1 it was alot of help

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By: Bilal Ahmad

Bilal Ahmad — Sat, 27 May 2017 01:30:43 +0000

Yes i have seen it in heat gun which is used in mobile repairing. It is connectes to gate of BT134 triac which controls the air in this heat gun

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By: Jestine Yong

Jestine Yong — Mon, 25 Jul 2016 23:50:00 +0000

In reply to kriyen.

Hi James Kriyen,

Good question. Common Diac part number are DB3/DB4/DB6 and the spec are the volt and ampere. This means you need to find out roughly what will be the voltage and ampere usage in your electronics circuit then only you choose the right Diac. You may also use the higher spec of Diac to test it out first.

Jestine

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By: kriyen

kriyen — Sat, 23 Jul 2016 11:44:58 +0000

great bit of information. i have a diac fitted inside a transmission and runs in hot oil. Can the heat affect the working conditions of the diac. if it is faulty, how do i order one if there are no numbers written on it, thanks and regards

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By: james

james — Sat, 23 Jul 2016 11:42:05 +0000

hello, if i remove a diac from pcb , how would i know what value it is to obuy one, if as you say, it must give no reading with analog meter

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