# LF398N

**Texas Instruments** · Sample / Hold Amplifiers · PDIP-8

LF398N from Texas Instruments, in a PDIP-8. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

## Pinout

| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | V+ | power_in | Positive supply; the device operates from ±5 V to ±18 V, with ±15 V as the recommended nominal supply. |
| 2 | OFFSET ADJUST | passive | DC offset compensation pin used to adjust the input offset voltage. |
| 3 | INPUT | input | Analog signal input to the sample-and-hold amplifier. |
| 4 | V- | power_in | Negative supply; the device operates from ±5 V to ±18 V, with ±15 V as the recommended nominal supply. |
| 5 | OUTPUT | output | Analog sample-and-hold output. |
| 6 | Ch | passive | Hold capacitor connection; the hold capacitor is connected to this pin, and its short-circuit duration is limited to 10 seconds. |
| 7 | LOGIC REFERENCE | input | Reference input for the LOGIC input; one of the logic pins must be at least 2 V below V+ and 3 V above V- for proper logic operation. |
| 8 | LOGIC | input | Logic input that selects sample mode or hold mode; it is compatible with TTL, PMOS and CMOS levels with a differential threshold of 1.4 V. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | PDIP-8 |
| Category | Amplifiers/Comparators |
| Pins | 8 |

## CAD (KiCad official)

- Symbol: `LF398N`
- Footprint: `Package_DIP:DIP-8_W7.62mm`
- 3D model: PDIP-8 (KiCad packages3D, STEP)
- 3D model files: `lf398n-etched.step` / `lf398n-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `lf398n.step` / `lf398n.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/cn/lit/gpn/lf398-n) (40 pp, sha256 `2119fa6b79e75b65`, retrieved 2026-10-10, tier: lcsc)
- **Datasheet language:** Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-haiku-5-5` (text), consensus `claude-sonnet-5-5` (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
- **CAD:** KiCad official libraries (CC-BY-SA 4.0).

[Datasheet PDF](docs/lf398n-datasheet.pdf)