Help with the identifying unknown transistor

[PPS]

Hello guys.
I need your help with the identifying of this transistor.
It is on the small PCB which adjusts the rotation speed of the Dewalt 707 miter saw.
Cant find this marking anywhere.

marking
on the top - 18 508
on the bottom - BSGZ348
as I can read
look at the pic

[fzabkar]

Are you sure it's a transistor and not a TRIAC?

[PPS]

No, I am not sure what is it.

[fzabkar]

It looks like item #61 in the exploded view (p/n 947064-04):

https://www.wmv-dresden.de/documents/DeWalt/dw_707_e_kappsaege_dewalt.pdf

I'd say it is definitely a TRIAC. Try to trace out the circuit, and tell us the power rating of the saw.


Edit:

https://forum.toolsinaction.com/topic/2959-my-dewalt-dw304-type-2-recipication-saw-quit-working-bad-switch/

Try replacing it with a "BTB12-12A 600V Triac ST Microelectonics".

[PPS]

This is definitely this PCB from Elu PS274 (Dewalt DW707 ).  so, according to manual Motor power (input) - 1200w

[fzabkar]

The DW304 is a 10 amp, 120V, 1150W saw:

https://www.dewalt.com/product/dwe304/100-amp-reciprocating-saw

Therefore, I think the TRIAC is a good fit.

https://www.farnell.com/datasheets/81403.pdf

[PPS]

Thanks a lot, but I've mentioned not DW304.
This is ELU 274  https://www.manualslib.com/manual/1143044/Elu-Ps274.html?page=22#manual  -- page 22 on website . It was old name. It was rebranding and now it Dewalt 707.
Working voltage- 220V. input power - 1200W. Fuse is - 10A

Why I can't find marking of the original triac?

[fzabkar]

No, this is not DW304. This is ELU 274  https://www.manualslib.com/manual/1143044/Elu-Ps274.html?page=22#manual  -- page 22 on website . It was old name. It was rebranding and now it Dewalt 707.
Working voltage- 220V. input power - 1200W. Fuse is - 10A

Why I can't find marking of the original triac?

I understand. All I'm saying is that these saws use similar designs for the switch and speed control. Since the DW304 has the same power rating, then its TRIAC should be more than adequate for your saw. In fact, your 220V saw will only consume 5A. The 600V rating would still be OK, but you could choose the 800V TRIAC for extra headroom.

As for the part number, I suspect that the TRIAC has been specially marked with Dewalt's own internal numbers rather than the manufacturer's.

[PPS]

Thank you indded. You helped me much. So I can use BTA10 and install it as previuos on the pcb without any position changes?

[PPS]

And how can I determine which Igt in mA and Voltage Gate Trigger (Vgt) for correct work i? if my Triac is burnt

[fzabkar]

I would choose a "standard" TRIAC. Don't use logic level triggering. I don't think there would be a need for sensitive gate triggering, either.

If possible, I would choose a "snubberless" TRIAC, ie one with a high dV/dt rating.

This thread may be helpful:

https://forum.toolsinaction.com/topic/3092-dw304-just-stopped-working/

BTW, "ST2 GE" is a DIAC.