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I am following this guide to hooking up a phone to a circuit, depending on the DTMF tones. However, when I went to buy one, I realized there were lots of different "editions"/models.

Which one should I choose? Does it really matter in my case? To make this question more useful for future visitors, how did you get your answer?

Datasheet for MT8870

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  • \$\begingroup\$ This isn't your traditional "shopping" question, but rather covers a point at which selection becomes a puzzle for many less experienced designers. \$\endgroup\$
    – Chris Stratton
    Commented Jun 13, 2013 at 20:48

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The first page of the datasheet explains the suffix codes except for the "-1".

Obviously if you want through-hole you pick some sort of DIP.

The "-1" suffix is explained under "Applications" as being appropriate for CEPT signaling rather than BT.

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  • \$\begingroup\$ I would want to use MT8870DE for the 18 pin version that I can breadboard with? \$\endgroup\$
    – Anonymous Penguin
    Commented Jun 14, 2013 at 13:25

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