Parts · ICs
LF412
Dual JFET-Input Op-Amp DIP-8 / SOIC-8.4 circuits use this part. Listed as: Dual op-amp, DIP8; IC-DIP-8.
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 4), 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 |
|---|---|---|---|---|---|---|---|
| LF412 | JFET | 7–36 V | 4.5 MHz | 21 V/µs | 18 nV | 0.56 mA | 4 |
FET-input dual with standard pinout per the drawing (the 2026 pin table misprints pins 4 to 8).
Fits the same socket
| Part | Input | Supply | GBW | Slew | Noise | Iq | Boards | Differs |
|---|---|---|---|---|---|---|---|---|
| TL072 | JFET | 4.5–40 V | 5.25 MHz | 20 V/µs | 37 nV | 1.4 mA | 1338 | JFET input; inputs must stay 4 V above the negative rail, and the input range reaches the positive rail. |
| TL082 | JFET | 4.5–40 V | 5.25 MHz | 20 V/µs | 37 nV | 1.4 mA | 72 | JFET input; inputs must stay 4 V above the negative rail, and the input range reaches the positive rail. |
| LF353 | JFET | 7–36 V | 3 MHz | 13 V/µs | 18 nV | 1.8 mA | 73 | draws 1.8 mA per amplifier. JFET dual; common-mode range must stay 4 V inside each rail. |
| OPA2134 | JFET | 5–36 V | 8 MHz | 20 V/µs | 8 nV | 4 mA | 108 | draws 4 mA per amplifier. FET-input audio op-amp without phase inversion; draws about 4 mA per amplifier, so it is hungry on a 9 V battery. |
| TLC272 | CMOS | 3–16 V | 4.5 MHz | 21 V/µs | 10.8 nV | 0.56 mA | 7 | CMOS input; 16 V max, not for 18 V; input range reaches the negative rail. CMOS dual limited to 16 V total; the input range includes the negative rail. |
| TLE2072 | 4.5–38 V | 10.6 MHz | 32 V/µs | 17 nV | 2.4 mA | 1 | draws 2.4 mA per amplifier. Fast, low-bias dual drawing about 2.4 mA per amplifier. | |
| CA3260 | mosfet, RR out | 4–16 V | 4 MHz | 10 V/µs | 4.5 mA | 8 | MOSFET input; 16 V max, not for 18 V; input range reaches the negative rail; rail-to-rail output; draws 4.5 mA per amplifier. CMOS output swings to both rails, but the 16 V supply limit rules out 18 V pedals. | |
| CA3240EZ | mosfet | 4–36 V | 4.5 MHz | 9 V/µs | 40 nV | 4 mA | 10 | MOSFET input; input range reaches the negative rail; draws 4 mA per amplifier. Dual CA3140: MOSFET inputs that reach 0.5 V below the negative rail, but about 4 mA per amplifier. |
| M5218 | 4–32 V | 7 MHz | 3 V/µs | 1.5 mA | 21 | draws 1.5 mA per amplifier; much slower. Low-noise audio dual the maker calls close to the 4558 and 4559, with ±50 mA load current. | ||
| UPC4570 | bipolar | 8–32 V | 15 MHz | 7 V/µs | 2.5 mA | 5 | bipolar input; draws 2.5 mA per amplifier. Low-noise, wideband audio dual; needs at least ±4 V (8 V) supply. |
| Faceplate | Circuit | Based on | Category | Vendor | Box | Knobs | Price | BOM |
|---|---|---|---|---|---|---|---|---|
| Moog VCF BC109 · LF412 · LM3046 · LM329 | — | Other | Experimentalists Anonymous | — | — | — | 90 | |
| PT2399 Voltage Control Circuit 2N3904 · LF412 | — | Utility | Experimentalists Anonymous | — | 1 | — | 11 | |
| 29 Boost 2SK3557 · L78L05_TO92 · LF412 · LF412CP 29 Pedals jFet Boost · 1590B | 29 Pedals jFet Boost | Boost | Five Cats Pedals | 1590B | 1 | £4.50 | 48 | |
| Skeptical Boost 2SK3557 · IAB0105D12 · L78L05 · LF412 29 Pedals jFet Boost · 125B | 29 Pedals jFet Boost | Fuzz | PedalPCB | 125B | 2 | $12.00 | 48 |