Nice little IC, lots of alternatives out there, like the AT42QT1012 but the TTP233 is dirt cheap.
Ebay UK ~£0.20 each : http://rover.ebay.com/rover/1/710-53481-19255-0/1?ff3=4&pub=5575545140&toolid=10001&campid=5338608128&customid=&mpre=https%3A%2F%2Fwww.ebay.co.uk%2Fitm%2FTTP223-BA6-223B-SOT23-6-Capacitive-Touch-Button-IC-Switch%2F303511728609
LCSC Electronics £0.11 each : https://lcsc.com/products/Touch-Screen-Controller-ICs_902.html?q=ttp223
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