Parts · ICs
ICM7555
CMOS Timer DIP-8 / SOIC-8.5 circuits use this part. Listed as: Semiconductors.
Datasheet · from renesas.com
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 |
|---|---|---|---|---|---|---|---|---|
| Fugly Face 4558 · ICM7555 · LM386 1590BBS | — | Fuzz | Dead End FX | 1590BBS | 6 | $15.00 | 44 | |
| Escobedo Ugly Face Vero19×13 Verified ICM7555 · JRC386D · LM386 · VTL5C3 Escobedo Ugly Face | Escobedo Ugly Face | Fuzz | Dirtbox Layouts | — | 4 | — | 17 | |
| Escobedo Ugly Face Perfboard Verified ICM7555 · JRC386D · LM386 · VTL5C2 Escobedo Ugly Face | Escobedo Ugly Face | Fuzz | Effects Layouts (blog) | — | 4 | — | 16 | |
| Uglyface ICM7555 · JRC386D · LM386 · OPTOISOLATOR | — | Fuzz | Experimentalists Anonymous | — | 4 | — | 16 | |
| Backpfeifengesicht ICM7555 · LM386 | — | Fuzz | Moonn Electronics | — | 4 | €4.50 | 18 |