# LF347DT

**STMicroelectronics** · FET InputAmplifiers · SOIC-14

LF347DT from STMicroelectronics, in a SOIC-14. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.

## Pinout

| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | OUT1 | output | Output of op-amp 1. |
| 2 | IN1- | input | Inverting input of op-amp 1. High-impedance JFET input. |
| 3 | IN1+ | input | Non-inverting input of op-amp 1. High-impedance JFET input. |
| 4 | VCC+ | power_in | Positive supply voltage. Absolute maximum +/-18 V (LF347: split supplies typ. +/-15 V). Shared by all four amplifiers. |
| 5 | IN2+ | input | Non-inverting input of op-amp 2. High-impedance JFET input. |
| 6 | IN2- | input | Inverting input of op-amp 2. High-impedance JFET input. |
| 7 | OUT2 | output | Output of op-amp 2. |
| 8 | OUT3 | output | Output of op-amp 3. |
| 9 | IN3- | input | Inverting input of op-amp 3. High-impedance JFET input. |
| 10 | IN3+ | input | Non-inverting input of op-amp 3. High-impedance JFET input. |
| 11 | VCC- | power_in | Negative supply voltage. Absolute maximum +/-18 V (LF347: split supplies typ. +/-15 V). Shared by all four amplifiers. |
| 12 | IN4+ | input | Non-inverting input of op-amp 4. High-impedance JFET input. |
| 13 | IN4- | input | Inverting input of op-amp 4. High-impedance JFET input. |
| 14 | OUT4 | output | Output of op-amp 4. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | STMicroelectronics |
| Package | SOIC-14 |
| Category | Op-amp/Cmp |
| Pins | 14 |

## Ordering variants

Same part, different packaging or reel option.

- `LF347DTD`
- `LF347DT`
- `LF347DTN`

## Electrical characteristics

Limits as printed in the datasheet (page.json `metadata.characteristics` carries them as data).

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Supply voltage | VCC | -18 |  | 18 | V |  | 2 |
| Input voltage | Vi | -15 |  | 15 | V | Must not exceed supply voltage or 15 V, whichever is less | 2 |
| Differential input voltage | Vid | -30 |  | 30 | V | Non-inverting input with respect to inverting input | 2 |
| Power dissipation | Ptot |  |  | 680 | mW |  | 2 |
| Operating free-air temperature range (LF347) | Toper | 0 |  | 70 | °C | LF347 | 2 |
| Storage temperature range | Tstg | -65 |  | 150 | °C |  | 2 |
| Input offset voltage | Vio |  | 3 | 10 | mV | Rs = 10kΩ, Tamb = 25°C | 3 |
| Input offset voltage | Vio |  |  | 13 | mV | Rs = 10kΩ, Tmin ≤ Tamb ≤ Tmax | 3 |
| Input offset current | Iio |  | 5 | 100 | pA | Tamb = 25°C | 3 |
| Input offset current | Iio |  |  | 4 | nA | Tmin ≤ Tamb ≤ Tmax | 3 |
| Input bias current | Iib |  | 20 | 200 | pA | Tamb = 25°C | 3 |
| Input bias current | Iib |  |  | 20 | nA | Tmin ≤ Tamb ≤ Tmax | 3 |
| Large signal voltage gain | Avd | 50 | 200 |  | V/mV | RL = 2kΩ, Vo = ±10V, Tamb = 25°C | 3 |
| Large signal voltage gain | Avd | 25 |  |  | V/mV | RL = 2kΩ, Vo = ±10V, Tmin ≤ Tamb ≤ Tmax | 3 |
| Supply voltage rejection ratio | SVR | 80 | 86 |  | dB | RS = 10kΩ, Tamb = 25°C | 3 |
| Supply voltage rejection ratio | SVR | 80 |  |  | dB | RS = 10kΩ, Tmin ≤ Tamb ≤ Tmax | 3 |
| Supply current, per amp, no load | ICC |  | 1.4 | 2.7 | mA | Tamb = 25°C | 3 |
| Supply current, per amp, no load | ICC |  |  | 2.7 | mA | Tmin ≤ Tamb ≤ Tmax | 3 |
| Input common mode voltage range | Vicm | -12 |  | 15 | V |  | 3 |
| Common mode rejection ratio | CMR | 70 | 86 |  | dB | RS = 10kΩ, Tamb = 25°C | 3 |
| Common mode rejection ratio | CMR | 70 |  |  | dB | RS = 10kΩ, Tmin ≤ Tamb ≤ Tmax | 3 |
| Output short-circuit current | IOS | 10 | 40 | 60 | mA | Tamb = 25°C | 3 |
| Output short-circuit current | IOS | 10 |  | 60 | mA | Tmin ≤ Tamb ≤ Tmax | 3 |
| Output voltage swing (±Vopp) | ±Vopp | 10 | 12 |  | V | Tamb = 25°C, RL = 2kΩ | 3 |
| Output voltage swing (±Vopp) | ±Vopp | 12 | 13.5 |  | V | Tamb = 25°C, RL = 10kΩ | 3 |
| Output voltage swing (±Vopp) | ±Vopp | 10 |  |  | V | Tmin ≤ Tamb ≤ Tmax, RL = 2kΩ | 3 |
| Output voltage swing (±Vopp) | ±Vopp | 12 |  |  | V | Tmin ≤ Tamb ≤ Tmax, RL = 10kΩ | 3 |
| Slew rate | SR | 12 | 16 |  | V/µs | Vi = 10V, RL = 2kΩ, CL = 100pF, Tamb = 25°C, unity gain | 3 |
| Gain bandwidth product | GBP |  | 2.5 | 4 | MHz | f = 100kHz, Tamb = 25°C, Vin = 10mV, RL = 2kΩ, CL = 100pF | 3 |

## CAD (KiCad official)

- Symbol: `LF347DT`
- Footprint: `Package_SO:SOIC-14_3.9x8.7mm_P1.27mm`
- 3D model: SOIC-14 (KiCad packages3D, STEP)
- 3D model files: `lf347dt-etched.step` / `lf347dt-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `lf347dt.step` / `lf347dt.glb` are the bare package body.

## Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

- **Datasheet:** [STMicroelectronics datasheet](docs/lf347dt-datasheet.pdf) (10 pp, sha256 `556fb7d5f3029d7c`, retrieved 2026-08-17, tier: lcsc)
- **Extractor:** `ds2sf` (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.
- **CAD:** KiCad official libraries (CC-BY-SA 4.0).

[Datasheet PDF](docs/lf347dt-datasheet.pdf)