# COSINA333MRB

**COSINE** · Instrumentation Amplifiers · MSOP-8

COSINA333MRB from COSINE, in a MSOP-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 | RG | passive | Gain-setting pin; for gains greater than 1, a single external gain resistor RG is connected between pin 1 and pin 8, with G = 1 + 100 kΩ/RG. |
| 2 | VIN- | power_in | Negative differential input of the instrumentation amplifier, with input common-mode range of -Vs to +Vs. |
| 3 | VIN+ | power_in | Positive differential input of the instrumentation amplifier, with input common-mode range of -Vs to +Vs. |
| 4 | -VS | power_in | Negative supply; operates from a single 1.8 V to 5.5 V supply or dual ±0.9 V to ±2.75 V supplies, and should be bypassed to ground with a 0.1 μF ceramic capacitor. |
| 5 | REF | input | Reference input that must be driven by a low-impedance source or connected to ground, since a series resistance of 8 Ω causes an 80 dB CMRR degradation. |
| 6 | VOUT | output | Amplifier output, referred to the REF pin, with swing within 2 mV of each rail at RL = 100 kΩ. |
| 7 | +VS | power_in | Positive supply; operates from 1.8 V to 5.5 V single supply or ±0.9 V to ±2.75 V dual supply, and should be bypassed close to the pin with a 0.1 μF ceramic capacitor. |
| 8 | RG | passive | Gain-setting pin; the other terminal of the external gain resistor RG (connected between pin 1 and pin 8) for gains greater than 1. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | COSINE |
| Package | MSOP-8 |
| Category | Amplifiers/Comparators |
| Pins | 8 |

## CAD (KiCad official)

- Symbol: `COSINA333MRB`
- Footprint: `Package_SO:MSOP-8_3x3mm_P0.65mm`
- 3D model: MSOP-8 (KiCad packages3D, STEP)
- 3D model files: `cosina333mrb-etched.step` / `cosina333mrb-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `cosina333mrb.step` / `cosina333mrb.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [COSINE datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8771479258055090176) (8 pp, sha256 `bdfc6b55ea745fa7`, retrieved 2026-10-09, 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/cosina333mrb-datasheet.pdf)