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2 parts compared · 13 differing specs across 14 total parameters.

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Specification differences for CD4017, HEF4017B
Parameter
Supply voltage-3V to 15V family window; anti-lock gating and the Schmitt clock input included.
Memory & Peripherals-The naming row it belongs to: CC4017, MC14017B, TC4017, MN4017 - every fab letter prefix, one pinout.
Compatibility Level-100% Drop-in (Zero Code Change)
Component CategoryDecade Counters (Johnson, Decoded)-
Core & Architecture-The Nexperia 4017: divide-by-ten Johnson counter, ten decoded outputs plus carry, clock/inhibit/reset control - the same JEDEC pinout the whole 4000B row follows.
Firmware Notes-Within the 4000B row the substitution is pin-for-pin; the watch items are supply (15V boards) and drive (weak 4000B outputs need buffering into heavier loads).
Hardware Notes-DIP-16 / SOIC-16, VDD 16 and VSS 8 by the standard.
Lead Time Advantage-Shenzhen Spot Stock (24-48h Dispatch)
Market RealityThe CD4017 is the LED chaser: a divide-by-ten Johnson counter with ten decoded outputs that walk one at a time - the chip behind running lights, sequencers, toy logic and a hundred beginner circuits, still sold in the millions as kits, and still repaired on old appliance and signage boards. The 4000B ecosystem makes sourcing calm: HEF4017, MC14017, TC4017 and the whole letter-soup row are the same die and pinout by standard. The one real confusion sits next door - the CD4022, its divide-by-eight sibling in the same 16-pin body with a different output pin map. Same family, same controls, different dance.-
Reference Part-CD4017
Role In CircuitOriginal Reference Part-
Sourcing Advantage-Continuous production; DIP parts still stocked for repair.
Sourcing StatusActive Shenzhen Spot Sourcing (24–48h)-
CaseDIP-16 / SOIC-16DIP-16 / SOIC-16

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