# S321

**Silicore(芯谷)** · Operational Amplifier · SOT-23-5

S321 from Silicore(芯谷), in a SOT-23-5. 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 | +IN | input | Non-inverting input of the rail-to-rail input amplifier, with input voltage range -0.1 V to +5.6 V at VS = 5.5 V. |
| 2 | V- | power_in | Negative supply (ground in single-supply use); supply operating range 2.1 V to 5.5 V, absolute maximum 7.5 V total. |
| 3 | -IN | input | Inverting input of the rail-to-rail input amplifier, with very low input bias current of 10 pA typical. |
| 4 | OUTPUT | output | Rail-to-rail amplifier output, with 20 mA minimum output current (RL = 100 kΩ condition) and stable with up to 200 pF load without series resistance. |
| 5 | V+ | power_in | Positive supply, operating range 2.1 V to 5.5 V with absolute maximum of 7.5 V. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Silicore(芯谷) |
| Package | SOT-23-5 |
| Category | Amplifiers/Comparators |
| Pins | 5 |

## Electrical characteristics

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

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Power Supply Voltage |  | 0 |  | 7.5 | V |  | 2 |
| Operating Temperature Range |  | -40 |  | 85 | °C |  | 2 |
| Power Supply Operating Range |  | 2.1 |  | 5.5 | V |  | 2 |
| Operating Temperature Range |  | -45 |  | 85 | °C |  | 2 |
| Storage Temperature Range |  | -65 |  | 150 | °C |  | 2 |
| Maximum Junction Temperature |  |  |  | 160 | °C |  | 2 |
| Lead Temperature |  |  |  | 260 | °C | 10 seconds | 2 |
| Input offset voltage |  | -5 | 0.8 | 5 | mV |  | 3 |
| Power supply rejection ratio |  | 60 | 82 |  | dB | Vs=+2.5V～ +5.5V | 3 |
| Common mode rejection ratio |  | 56 | 68 |  | dB | Vs=5.5V, Vo = 0.1～4.9V | 3 |
| Supply current |  |  | 120 | 240 | µA |  | 3 |
| Input common mode voltage range |  | -0.1 |  | 5.6 | V | Vs=5.5V | 3 |
| Output current |  | 20 | 23 |  | mA | RL=100kΩ | 3 |
| Gain bandwidth product |  |  | 1 |  | MHz | CL=100pF | 3 |
| Phase margin |  |  | 52 |  | Deg |  | 3 |
| Gain margin |  |  | 17 |  | dB |  | 3 |
| Slew rate |  |  | 0.52 |  | V/µs | Vo=1Vpp | 3 |
| Input voltage noise |  |  | 36 |  | nV/Hz | >50kHz | 3 |
| Input bias current |  |  | 10 |  | pA |  | 3 |
| Input offset current |  |  | 10 |  | pA |  | 3 |
| Output voltage Swing from Rail |  |  | 0.008 |  | V | RL=100kΩ | 3 |

## CAD (KiCad official)

- Symbol: `S321`
- Footprint: `Package_TO_SOT_SMD:SOT-23-5`
- 3D model: SOT-23-5 (KiCad packages3D, STEP)
- 3D model files: `s321-etched.step` / `s321-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `s321.step` / `s321.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Silicore(芯谷) datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8590921390755835904) (10 pp, sha256 `e5f9bc467511bd03`, retrieved 2026-10-17, tier: lcsc)
- **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/s321-datasheet.pdf)