LMC660CN

Quad CMOS-Input Op-Amp DIP-14.4 circuits use this part.

Datasheet · from ti.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 6), 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	Input	Supply	GBW	Slew	Noise	Iq	Boards
LMC660CN	CMOS, RR out	4.75–15.5 V	1.4 MHz	1.1 V/µs	22 nV	0.4 mA	4

CMOS quad limited to 15.5 V total; rail-to-rail output and an input range that includes ground.

Fits the same socket

Part	Input	Supply	GBW	Slew	Noise	Iq	Boards	Differs
TLC2264	CMOS, RR out	4.4–16 V	0.73 MHz	0.55 V/µs	12 nV	0.21 mA	3	CMOS rail-to-rail-output quad limited to 16 V total.
TLC2274	CMOS, RR out	4.4–16 V	2.25 MHz	3.6 V/µs	9 nV	1.2 mA	1	draws 1.2 mA per amplifier. CMOS rail-to-rail-output quad limited to 16 V total.
LF444	JFET	?–36 V	1 MHz	1 V/µs	35 nV	0.15 mA	4	JFET input. Low-power JFET quad at about 150 µA per amplifier.
3403	bipolar	5–30 V	1 MHz	0.6 V/µs		0.7 mA	17	bipolar input. 741-class quad that runs from a single supply; the input range includes the negative rail and the output has a class AB stage.
LM324	bipolar	3–30 V	1.2 MHz	0.5 V/µs	35 nV	0.35 mA	100	bipolar input. Input range includes the negative rail and the output nears ground, but it is slow and shows crossover distortion.
LM348	bipolar	8–36 V	1 MHz	0.5 V/µs		0.6 mA	2	bipolar input. Four 741-class amplifiers in the LM324/TL074 pinout.
TLC27M4AIN	CMOS	3–16 V	1.1 MHz	4.5 V/µs	32 nV	0.06 mA	8	Low-power CMOS quad limited to 16 V; the input range includes the negative rail (single-supply friendly).
TL064	JFET	10–30 V	1 MHz	3.5 V/µs	30 nV	0.2 mA	17	JFET input; rated from 10 V. Low-power JFET quad at 200 µA per amplifier.
JRC2902	bipolar	3–32 V	0.5 MHz	0.5 V/µs		0.25 mA	2	bipolar input. LM324-class single-supply quad with crossover distortion; the DIP14 (NJM2902N) is listed as discontinued.
MC33179	bipolar	4–36 V	5 MHz	2 V/µs	7.5 nV	0.425 mA	2	bipolar input. Quad version of the MC33178 in the standard quad pinout.

Circuit	Based on	Category	Vendor	Box	Knobs	Price	BOM
Grimafuzz LMC660CN · LT1054 · TL072 · TL074 1590BBS	—	Fuzz	Dead End FX	1590BBS	7	$15.00	52
Pllain 40106N · 4017N · 4046N · CD40106 1590XX	—	Fuzz	Dead End FX	1590XX	11	$20.00	67
Pllone 40106N · 4017N · 4046N · CD40106 Schumann PLL	Schumann PLL	Fuzz	Dead End FX	—	14	$25.00	79
Deadend Fx Grimmafuzz / Schumann PLL fuzz section Vero24×24 Unverified 7660S · ICL7660S · LMC660CN · TL072 Deadend Fx Grimmafuzz / Schumann PLL fuzz section	Deadend Fx Grimmafuzz / Schumann PLL fuzz section	Fuzz	Dirtbox Layouts	—	7	—	33