Parts · ICs
CA3140
Single MOSFET-Input Op-Amp DIP-8 / SOIC-8.8 circuits use this part.
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 | Input | Supply | GBW | Slew | Noise | Iq | Boards |
|---|---|---|---|---|---|---|---|
| CA3140 | mosfet | 4–36 V | 4.5 MHz | 9 V/µs | 40 nV | 4 mA | 12 |
MOSFET input that reaches 0.5 V below the negative rail, internally compensated; draws about 4 mA.
Fits the same socket
| Part | Input | Supply | GBW | Slew | Noise | Iq | Boards | Differs |
|---|---|---|---|---|---|---|---|---|
| CA3130 | mosfet, RR out | 5–16 V | 4 MHz | 10 V/µs | 10 mA | 54 | needs a compensation capacitor across pins 1 and 8; 16 V max, not for 18 V; rail-to-rail output. Needs a 47 pF capacitor between pins 1 and 8 for unity-gain stability (15 MHz uncompensated) and is limited to 16 V total supply. | |
| LF356 | JFET | ?–36 V | 5 MHz | 12 V/µs | 12 nV | 5 mA | 14 | JFET input. JFET single drawing about 5 mA; specified at ±15 V. |
| TL071 | JFET | 4.5–40 V | 5.25 MHz | 20 V/µs | 37 nV | 1.4 mA | 178 | JFET input. JFET input; this revision shows pins 1, 5 and 8 as no-connect on the DIP, so no offset trim. |
| TL081 | JFET | 4.5–40 V | 5.25 MHz | 20 V/µs | 37 nV | 1.4 mA | 20 | JFET input. JFET input; this revision shows no offset-null pins on the DIP. |
| TL051 | JFET | 10–30 V | 4.5 MHz | 17.8 V/µs | 10.8 nV | 2.1 mA | 8 | JFET input; rated from 10 V. Trimmed-offset upgrade for the TL071/TL081; pins 1, 5 and 8 are no-connect in this revision. |
| LF355 | JFET | ?–36 V | 2.5 MHz | 5 V/µs | 20 nV | 2 mA | 1 | JFET input. Lower-power, slower sibling of the LF356. |
| OPA134 | JFET | 5–36 V | 8 MHz | 20 V/µs | 8 nV | 4 mA | 3 | JFET input. FET-input audio op-amp with no offset null; leave pins 1, 5 and 8 unconnected. |
| LM308 | bipolar | 10–36 V | 0.3 mA | 96 | bipolar input; needs a compensation capacitor across pins 1 and 8; rated from 10 V. Needs a compensation capacitor (30 pF typical) between pins 1 and 8; the cap sets slew rate and tone. | |||
| OPA604AP | JFET | 9–48 V | 20 MHz | 25 V/µs | 11 nV | 5.3 mA | 4 | JFET input; much faster, may oscillate in a slow part's place. FET-input audio op-amp that runs to ±24 V but draws about 5.3 mA. |
| TL061 | JFET | 10–30 V | 1 MHz | 3.5 V/µs | 30 nV | 0.2 mA | 34 | JFET input; rated from 10 V. Low-power JFET op-amp at 200 µA; the pin table gives offset null on 1 and 5 though the drawing marks them NC. |
| Faceplate | Circuit | Based on | Category | Vendor | Box | Knobs | Price | BOM |
|---|---|---|---|---|---|---|---|---|
| Basic Saw VCO 2N4391 · CA3140 · LM319 · MAT04 | — | Ring Mod / Synth | Experimentalists Anonymous | — | 2 | — | 34 | |
| Dual VCO 2N3906 · CA3046 · CA3140 · LF347 | — | Ring Mod / Synth | Experimentalists Anonymous | — | — | — | 26 | |
| Korg MS10 14007 · 14069 · 2SA564A(S) · 2SC1583G Korg MS10 | Korg MS10 | Ring Mod / Synth | Experimentalists Anonymous | — | 1 | — | 267 | |
| Simple Two Pole State Variable Filter CA3140 · TL082 | — | EQ / Filter | Experimentalists Anonymous | — | — | — | 20 | |
| Two Pole SVF CA3140 · TL082 | — | Other | Experimentalists Anonymous | — | — | — | 20 | |
| Polytrog 1458 · 2N3904 · 2N5087 · 2N5088 Electro-Harmonix Polyphase · 1590BB | Electro-Harmonix Polyphase | Distortion | Madbean | 1590BB | 2 | $16.00 | 141 | |
| Poly-face 1458 · 2N3904 · 2N5087 · 2N5088 Polyphaser EHX | Polyphaser EHX | Phaser | PCB Guitar Mania | — | 6 | €19.90 out | 147 | |
| Colonel Angus CA3140 · MMBF170 Steel Panther Pussy Melter | Steel Panther Pussy Melter | Overdrive | Sheepylove | — | 5 | €10.00 | 41 |