Parts · ICs

LF347

Quad JFET-Input Op-Amp DIP-14 / SOIC-14.20 circuits use this part. Listed as: IC LF347 (TL084CN, OP482, AD713) DIP14; Quad op-amp, DIP14.

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 5), 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
LF347	JFET	7–36 V	3 MHz	13 V/µs	18 nV	2 mA	20

JFET quad; common-mode range must stay 4 V inside each rail.

Fits the same socket

Part	Input	Supply	GBW	Slew	Noise	Iq	Boards	Differs
TL074	JFET	4.5–40 V	5.25 MHz	20 V/µs	37 nV	1.4 mA	315	JFET input; inputs must stay 4 V above the negative rail.
TL084	JFET	4.5–40 V	5.25 MHz	20 V/µs	37 nV	1.4 mA	15	JFET quad; inputs must stay 4 V above the negative rail.
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. Low-noise quad (4.4 nV/√Hz at 100 kHz) limited to 12 V total; it will not survive an 18 V rail.
TLE2074		4.5–38 V	10.6 MHz	32 V/µs	17 nV	2.4 mA	20	Fast, low-bias quad drawing about 2.4 mA per amplifier; the input range reaches the positive rail but stops 4 V above the negative one.
TL064	JFET	10–30 V	1 MHz	3.5 V/µs	30 nV	0.2 mA	17	rated from 10 V. Low-power JFET quad at 200 µA per amplifier.
TLC2274	CMOS, RR out	4.4–16 V	2.25 MHz	3.6 V/µs	9 nV	1.2 mA	1	CMOS input; 16 V max, not for 18 V; input range reaches the negative rail; rail-to-rail output. CMOS rail-to-rail-output quad limited to 16 V total.
MC33179	bipolar	4–36 V	5 MHz	2 V/µs	7.5 nV	0.425 mA	2	bipolar input; much slower. Quad version of the MC33178 in the standard quad pinout.
LF444	JFET	?–36 V	1 MHz	1 V/µs	35 nV	0.15 mA	4	much slower. Low-power JFET quad at about 150 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; input range reaches the negative rail. Low-power CMOS quad limited to 16 V; the input range includes the negative rail (single-supply friendly).
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; input range reaches the negative rail; rail-to-rail output; much slower. CMOS quad limited to 15.5 V total; rail-to-rail output and an input range that includes ground.

Circuit	Based on	Category	Vendor	Box	Knobs	Price	BOM
Stretta BC639 · LF347 · LF347N · LT1054 Cicognani SexyComp 76 · 125B	Cicognani SexyComp 76	Compressor	Dead End FX	125B	6	$12.00	49
Tatiana 4066N · 4069N · CD4066 · CD4069UB rarely seen Schumann FLoop · 1590BBS	rarely seen Schumann FLoop	Vibrato / Chorus	Dead End FX	1590BBS	6	$15.00	46
Carl Martin Panama Vero22×22 Verified 7660S · LF347 · LF353 Carl Martin Panama	Carl Martin Panama	Distortion	Dirtbox Layouts	—	4	—	34
Carl Martin Plexi Tone 9v/-9v Vero17×18 Unverified 7660S · ICL7660S · LF347 Carl Martin Plexi Tone 9v/-9v	Carl Martin Plexi Tone 9v/-9v	Boost	Dirtbox Layouts	—	5	—	30
Keeley El Rey Dorado Vero21×16 Verified 7660S · ICL7660SCPA · LF347 Keeley El Rey Dorado	Keeley El Rey Dorado	Overdrive	Dirtbox Layouts	—	3	—	27
Schumann F Loop Vero28×24 Verified CD4066 · CD4066N · CD4069N · CD4069UB Schumann F Loop	Schumann F Loop	EQ / Filter	Dirtbox Layouts	—	6	—	36
Carl Martin Plexi-Tone Perfboard Verified LF347 · LT1054 Carl Martin PlexiTone · 1590BB	Carl Martin PlexiTone	Preamp / Amp-in-a-box	Effects Layouts (blog)	1590BB	5	—	32
Keeley El Rey Dorado Perfboard Verified 7660S · LF347 Keeley El Rey Dorado	Keeley El Rey Dorado	Preamp / Amp-in-a-box	Effects Layouts (blog)	—	3	—	31
Dual VCO 2N3906 · CA3046 · CA3140 · LF347	—	Ring Mod / Synth	Experimentalists Anonymous	—	—	—	26
Decimator G-String 2N2222A · 2N5551 · LF347 · LF353 ISP Decimator G-String	ISP Decimator G-String	Noise Gate	Guitar-Electronics.eu	—	—	€8.75	78
Plexitone 7805 · A0512S2WR2 · LF347 Carl Martin PlexiTone	Carl Martin PlexiTone	Overdrive	Guitar-Electronics.eu	—	3	€6.25	35
DuPlex Overdrive 7660S · ICL7660SCPAZ · LF347 (TL084CN, OP482, AD713) Carl Martin PlexiTone · 1590BB	Carl Martin PlexiTone	Overdrive	HotKits	1590BB	5	$5.00	29
Boneyard J201 · LF347 · TC1044 · TC1044SCPA Carl Martin PlexiTone · 1590B	Carl Martin PlexiTone	Distortion	Madbean	1590B	3	$10.00	43
Noise Terminator 2N5551 · LF347 · LF353 · LF353N Decimator G strong II · 1590BB	Decimator G strong II	Noise Gate	PCB Guitar Mania	1590BB	1	€11.90 out	80
Pleximan LF347 · TC1044 · TC1044SCPA · TL072 Carl Martin PlexiTone · 1590BB	Carl Martin PlexiTone	Distortion	PCB Guitar Mania	1590BB	4	€11.90 out	54
King Midas Overdrive 7660S · ICL7660SCPA · LF347 Keeley El Rey Dorado · 125B	Keeley El Rey Dorado	Fuzz	PedalPCB	125B	4	$8.00	37
Unchained Overdrive 7660S · ICL7660SCPA · LF347 · LF353 Carl Martin Panama · 125B	Carl Martin Panama	Fuzz	PedalPCB	125B	4	$10.00	52
Carl Martin PlexiTone (rev. 3) 7812 · 7912 · LF347 Carl Martin PlexiTone	Carl Martin PlexiTone	Distortion	Revolution Deux	—	5	—	43
Caline Englishman Vero21×15 Verified LF347 · LF347N · TC1044 · TC1044S Caline Englishman	Caline Englishman	Distortion	Tagboard Effects	—	3	—	23
Way Huge Green Rhino MK II Vero22×22 Verified LF347 · LM833 · PN2484 Way Huge Green Rhino Mk. II	Way Huge Green Rhino Mk. II	Overdrive	Tagboard Effects	—	3	—	31