Added 4 years, 1 month ago.
Hello there,
Thanks for reaching us. If you check the datasheet below, at page 7:
You'll notice that Pins 2 and 4 are grounded, while 1 and 3 correspond to B and C, respectively. Pins 3 and 4 are not connected.
Please let us know if you need anything else - We'd be glad to help!
Answered 4 years, 1 month ago.