# LF356

**Texas Instruments** · Operational Amplifier · SOIC-8

The LF356 is a single JFET-input operational amplifier with a 12 V/us slew rate, 5 MHz bandwidth, and fast settling time. Its JFET inputs give high input impedance and low bias current, suiting sample-and-hold circuits, DAC output buffers, fast active filters, and general high-speed analog.

## Pinout

| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | BALANCE | input | Offset-null / balance terminal for trimming input offset voltage. Connect a potentiometer between pins 1 and 5 with the wiper returned to V- (see typical application). |
| 2 | -INPUT | input | Inverting input of the op-amp (JFET gate). High input impedance ~10^12 Ω, input bias current typ. 30 pA. Absolute-max differential input ±40 V (LF15x/LF25x/LF356B) or ±30 V (LF35x). |
| 3 | +INPUT | input | Noninverting input of the op-amp (JFET gate). High input impedance ~10^12 Ω, input bias current typ. 30 pA. |
| 4 | V- | power_in | Negative power supply rail. Recommended operating range ±15 V (Vs); absolute-max supply ±22 V (LF356B) / ±18 V (LF35x). Bypass to ground with a local ceramic capacitor. |
| 5 | BALANCE | input | Offset-null / balance terminal (second end of the offset-trim pot). Connect a potentiometer between pins 1 and 5 with the wiper to V-. |
| 6 | OUTPUT | output | Op-amp output. Continuous output short-circuit protected. Drives capacitive loads up to 5,000 pF without stability problems. Large-signal voltage gain typ. 106 dB. |
| 7 | V+ | power_in | Positive power supply rail. Recommended operating range ±15 V (Vs); absolute-max supply ±22 V (LF356B) / ±18 V (LF35x). Bypass to ground with a local ceramic capacitor. |
| 8 | NC | unconnected | No internal connection. Leave floating or tie to a convenient net; do not use as a routing tie-point on critical high-impedance nodes. |

## Key specifications

| Parameter | Value |
|---|---|
| Type | Single JFET-input op-amp |
| Supply voltage | +-5 V to +-18 V |
| Input bias current | 30 pA typ |
| Slew rate | 12 V/us typ |
| Gain-bandwidth product | 5 MHz typ |
| Settling time | 1.5 us to 0.01% |
| Operating temperature | 0 C to 70 C |

## Ordering variants

Same part, different packaging or reel option.

- `LF356P`
- `LF356N`
- `LF356D`
- `LF356DR`
- `LF356H`
- `LF356LMC`

## CAD (KiCad official)

- Symbol: `lf356.kicad_sym`
- Footprint: `lf356.kicad_mod`
- 3D model: SOIC-8 body from KiCad `Package_SO/SOIC-8_3.9x4.9mm_P1.27mm`.
- 3D model files: `lf356-etched.step` / `lf356-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `lf356.step` / `lf356.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Texas Instruments datasheet](https://www.ti.com/lit/ds/symlink/lf356.pdf) (47 pp, sha256 `5d84a62d96b964a5`, retrieved 2026-08-17, tier: manufacturer)
- **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/lf356-datasheet.pdf)