3403

Quad BJT-Input Op-Amp DIP-14 / SOIC-14.17 circuits use this part. Listed as: IC; Operational amplifier, quad, DIP-14.

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 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	Input	Supply	GBW	Slew	Noise	Iq	Boards
3403	bipolar	5–30 V	1 MHz	0.6 V/µs		0.7 mA	17

741-class quad that runs from a single supply; the input range includes the negative rail and the output has a class AB stage.

Fits the same socket

Part	Input	Supply	GBW	Slew	Noise	Iq	Boards	Differs
LM324	bipolar	3–30 V	1.2 MHz	0.5 V/µs	35 nV	0.35 mA	100	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	Four 741-class amplifiers in the LM324/TL074 pinout.
JRC2902	bipolar	3–32 V	0.5 MHz	0.5 V/µs		0.25 mA	2	LM324-class single-supply quad with crossover distortion; the DIP14 (NJM2902N) is listed as discontinued.
TLC2264	CMOS, RR out	4.4–16 V	0.73 MHz	0.55 V/µs	12 nV	0.21 mA	3	CMOS input; 16 V max, not for 18 V; rail-to-rail output. 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.
LMC660CN	CMOS, RR out	4.75–15.5 V	1.4 MHz	1.1 V/µs	22 nV	0.4 mA	4	CMOS input; 15.5 V max, not for 18 V; rail-to-rail output. CMOS quad limited to 15.5 V total; rail-to-rail output and an input range that includes ground.
MC33179	bipolar	4–36 V	5 MHz	2 V/µs	7.5 nV	0.425 mA	2	much faster, may oscillate in a slow part's place. Quad version of the MC33178 in the standard quad pinout.
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.
TLC27M4AIN	CMOS	3–16 V	1.1 MHz	4.5 V/µs	32 nV	0.06 mA	8	CMOS input; 16 V max, not for 18 V. Low-power CMOS quad limited to 16 V; the input range includes the negative rail (single-supply friendly).
TL974	RR out	2.7–12 V	10.6 MHz			2.48 mA	1	12 V max, not for 18 V; rail-to-rail output; draws 2.48 mA per amplifier; much faster, may oscillate in a slow part's place. Low-noise quad (4.4 nV/√Hz at 100 kHz) limited to 12 V total; it will not survive an 18 V rail.

Circuit	Based on	Category	Vendor	Box	Knobs	Price	BOM
Chroma Parametric Boost 3403 · NJM3403AD Boss SP-1 Spectrum · 125B	Boss SP-1 Spectrum	Boost	Aion FX	125B	3	$12.50	45
Chroma (Legacy) 3403 · RC3403A Boss SP-1 Spectrum · 1590B	Boss SP-1 Spectrum	EQ / Filter	Aion FX	1590B	2	—	33
Corona (Legacy) 3403 · RC3403 Boss OD-1 · 1590B	Boss OD-1	Overdrive	Aion FX	1590B	2	—	31
Parhelion Vintage Overdrive 3403 · NJM3403AD Boss OD-1 · 1590B	Boss OD-1	Overdrive	Aion FX	1590B	2	$12.50	51
Kakehashi'S Nightmare 2N3904 · 2N5087 · 2N5089 · 2SK30A-GR Boss DB-5 DRIVER · 1590D	Boss DB-5 DRIVER	Fuzz	Dead End FX	1590D	5	$20.00	107
Boss OD-1 Overdrive - Quad Op Amp version Vero17×16 Verified 3403 · RC3403ADB Boss OD-1 Overdrive - Quad Op Amp version	Boss OD-1 Overdrive - Quad Op Amp version	Overdrive	Dirtbox Layouts	—	2	—	21
Boss OD-1 Perfboard Verified 3403 · RC3403ADB Boss OD-1 · 1590B	Boss OD-1	Overdrive	Effects Layouts (blog)	1590B	2	—	21
Morley Echo Chorus Vibrato 1458 · 2N5087 · 3403 · 78L15 Morley Echo Chorus Vibrato	Morley Echo Chorus Vibrato	Vibrato / Chorus	Experimentalists Anonymous	—	3	—	154
Morley sapphire flanger 3403 · CD4007 · CD4007UB · CD4047 Morley sapphire flanger	Morley sapphire flanger	Flanger	Experimentalists Anonymous	—	3	—	90
Pearl OC-07 2SC1815(Y) · 2SK105(F) · 3403 · CD4007UB Pearl OC-07 Octaver	Pearl OC-07 Octaver	Vibrato / Chorus	Experimentalists Anonymous	—	—	—	137
Synblo 3403 · CA3080 · LM13600	—	Ring Mod / Synth	Experimentalists Anonymous	—	8	—	58
Syntom 3403 · 741 · BC182L · CA3080	—	Ring Mod / Synth	Experimentalists Anonymous	—	4	—	43
SP-1 Spectrum 3403 · RC3403A Boss SP-1 Spectrum	Boss SP-1 Spectrum	EQ / Filter	Griffin Effects	—	1	$11.00	34
The Mimosa 2N5457 · 3403 · MC3403 Dan Armstrong Orange Squeezer	Dan Armstrong Orange Squeezer	Compressor	Moody Sounds	—	2	kr750.00	27
Yellow Overdrive 3403 Boss OD-1	Boss OD-1	Overdrive	Moody Sounds	—	2	kr895.00 out	19
SP-1 Spectrum 3403 · RC3403A Boss SP-1 Spectrum	Boss SP-1 Spectrum	Bass	PCBWay: Glory to Ukraine	—	2	—	24
OD77 - The primordial overdrive 3403 · NJM3403 Boss OD-1	Boss OD-1	Overdrive	Sheepylove	—	2	€10.00	31