7555

CMOS Timer DIP-8 / SOIC-8.1 circuit uses this part.

Substitutes same socket

Parts that fit the same socket: the same function, pin count and pinout. The figures are read off each part's datasheet (this one's from page 3), typical where the sheet gives a typical value, otherwise the maximum. Closest first; the last column says what differs. A different part can change the sound, and a circuit may lean on one particular figure, so read the build document's notes before you swap.

This part

Part	Supply	Boards
ICM7555	2–18 V	6

CMOS 555 drawing about 60 µA, with no supply glitch at each output edge, so it ticks less in audio circuits.

Fits the same socket

Part	Supply	Boards	Differs
NE555	4.5–16 V	71	16 V max, not for 18 V. Bipolar timer drawing about 10 mA at 15 V and putting current spikes on the supply when it switches; the SE555 grade runs to 18 V.
TLC555	2–15 V	3	15 V max, not for 18 V. CMOS 555 drawing at most 250 µA, with far smaller supply spikes than the NE555; output sources only about 10 mA, and 15 V is the limit.

Faceplate	Circuit	Based on	Category	Vendor	Box	Knobs	Price	BOM
	5k analog delay module 7555 · ? · RD5106A	—	Delay	Experimentalists Anonymous	—	—	—	62