Is the base not connected?

It doesn't need the base connection (you might need a small capacitor from base to emitter to prevent interference pickup)
Compare with TLP184
https://toshiba.semicon-storage.com/info/TLP184_datasheet_en_20190617.pdf?did=11793&prodName=TLP184
A TLP184 has a better current transfer ratio - you could use that instead. I couldn't remember the part number when I wrote the first reply.

What wattage resistors should be on pin1 and pin2?

Quarter watt, but make sure that they are rated for more than 200V.

 

It doesn't need the base connection (you might need a small capacitor from base to emitter to prevent interference pickup)
Compare with TLP184
https://toshiba.semicon-storage.com/info/TLP184_datasheet_en_20190617.pdf?did=11793&prodName=TLP184
A TLP184 has a better current transfer ratio - you could use that instead. I couldn't remember the part number when I wrote the first reply.

Quarter watt, but make sure that they are rated for more than 200V.

How do I know if a resistor is rated for xxxV? All the resistor listings I see never specify a voltage!
...and I assume that the wiring for the TLP184 is the same as the H11AA1?

 

How do I know if a resistor is rated for xxxV? All the resistor listings I see never specify a voltage!

If it doesn't say, then you shouldn't be buying it. (and don't forget you need a working voltage of 325V for 230V AC supply)

...and I assume that the wiring for the TLP184 is the same as the H11AA1?

Yes. It just doesn't have the base pin. That's better because there isn't an external connection that can pick up interference.

 

If it doesn't say, then you shouldn't be buying it. (and don't forget you need a working voltage of 325V for 230V AC supply)
View attachment 277960


Yes. It just doesn't have the base pin. That's better because there isn't an external connection that can pick up interference.

Can a TLP185 be used instead of a TLP184?

 

It's not the same thing at all. TLP184 is an AC input device. TLP185 isn't.

 

It's not the same thing at all. TLP184 is an AC input device. TLP185 isn't.

OK - I have just ordered some TLP184's

 

I am attempting to make a circuit that detects when mains (AC) voltage is present.

Like this?
https://www.amazon.com/Non-Contact-...-Detector/dp/B09WSQQG86/ref=asc_df_B09WSBQXLT
If you're just looking to test a line this will work nicely. If you want something that monitors mains voltage all the time then a night light with the Photo Resistor taped over. If it thinks it's dark out it will light up. Unless there's no power.

Here's a four pack: https://www.amazon.com/Emotionlite-Night-Sensor-Nursery-Listed/dp/B01LQX0BXA/ref=sr_1_9

 

Compare with TLP184
https://toshiba.semicon-storage.com/info/TLP184_datasheet_en_20190617.pdf?did=11793&prodName=TLP184
A TLP184 has a better current transfer ratio

Interesting - this datasheet says "Not recommended for new design". Is that because the TLP184 has been replaced with something else, or is it being phased out?

 

Interesting - this datasheet says "Not recommended for new design". Is that because the TLP184 has been replaced with something else, or is it being phased out?

News to me if they are!
RS doesn’t mention it.
https://docs.rs-online.com/43b4/0900766b8129d59f.pdf
but they don’t have any stock, although that means nothing these days!