Common used thyristor (SCR)

[ArivNidunami]

Hi, like BC547 is common used transistor for low voltage.
Now I'm looking for common thyristor for my simple 5V relay switch, any suggestion?
Thanks for answering.

 

[rjenkinsgb]

Common types for small loads are such as C106 (in many variations), and BT14x / BT15x series.
There are hundreds of others though.

The C106 is a "sensitive gate" type that only needs a low trigger current, 200uA. Many types need 10 - 100mA or more to trigger.

eg.

Littelfuse C106D1G, Thyristor 400V, 2.55A 0.2mA | RS

uk.rs-online.com

WeEn Semiconductors Co., Ltd BT148-600R,127, Thyristor 600V, 2.5A 0.2mA | RS

uk.rs-online.com

WeEn Semiconductors Co., Ltd BT152-600R,127, Thyristor 650V, 13A 32mA | RS

uk.rs-online.com

 

[schmitt trigger]

WeEn Semiconductor?

I can see that once upon a time, it was Philips, then NXP,now it is WeEn.

 

[ChrisP58]

Be aware of the on state forward voltage of thyristor is not very low. The datasheet for the C106 shows that it could be as high as 2.2 Volts. This can be a problem when used in low voltage circuits.

With a supply of 5V, the relay may only see 2.8 Volts