Select COSINA333 5V instrumentation amps for sensors, portable medical, weighing
COSINE catalogs a dedicated 5V instrumentation amplifier class for: sensor amplification, medical instruments, portable systems, industrial control processing, and weighing scales. If your rail is already 1.8–5.5 V (battery/portable MCU domain) and you need in-amp gain + CMRR with shutdown / micro-power budget, evaluate this tier—not a 36V industrial in-amp forced onto a 5V board, and not a general RRIO op-amp.
Table metrics follow the 2025 catalog. Suffixes (MRA/MRB/-20/-50) are gain/grade splits—confirm with Jarwey. Request datasheets from Jarwey; qualify before production.
Product features
High precision, low drift, low noise density; 1.8–5.5 V supply with shutdown. The same catalog table also lists COSINA855 / COSINA350 / COS8236 as 5V in-amp variants—request datasheets to split by project.
Applications (vendor-stated)
Sensor amplification · medical instruments · portable systems · industrial control processing · weighing scales.
5V in-amp table (COSINA333 family)
| PN | Supply (V) | Gain | BW | Noise @1kHz | Vos max | Drift | Iq | Package | Cross-ref | Page |
|---|---|---|---|---|---|---|---|---|---|---|
| COSINA333MRA | 1.8~5.5 (±0.9~±2.75) | 1~1000 | 250 kHz | 50 nV/√Hz | 25 µV | 0.05 µV/°C | 70 µA | MSOP-8 | INA333 | 914 |
| COSINA333MRB | 1.8~5.5 (±0.9~±2.75) | 1~1000 | 250 kHz | 50 nV/√Hz | 25 µV | 0.05 µV/°C | 70 µA | MSOP-8 | INA333 | 915 |
| COSINA333-20MR | 1.8~5.5 (±0.9~±2.75) | confirm suffix | 250 kHz class | 50 nV/√Hz | 25 µV | 0.05 µV/°C | ~70 µA | MSOP-8 | INA333 | 916 |
| COSINA333-50MR | 1.8~5.5 (±0.9~±2.75) | confirm suffix | 250 kHz class | 50 nV/√Hz | 25 µV | 0.05 µV/°C | ~70 µA | MSOP-8 | INA333 | 917 |
Primary second-source check: INA333 (must verify). For ±15 V industrial analog input modules, weighing transmitters, and DAQ racks, see the companion 36V instrumentation amplifier family.
Checklist mapped to vendor applications
- Rail: portable/battery/5V MCU domain → this tier; industrial ±15 V → 36V in-amps.
- Weighing / sensor front-end: full-scale & resolution vs 25 µV Vos / 0.05 µV/°C drift.
- Medical portable: 250 kHz / 50 nV/√Hz enough for electrode/bridge BW?
- Gain: 1–1000 adjustable vs fixed-suffix parts vs calibration flow.
- Shutdown / Iq: ~70 µA + shutdown fit sleep strategy?
- Package: MSOP-8 / DFN-8 locked for Layout.
- Samples: request datasheets/samples from Jarwey; pilot before primary source change.
Pages & contact
Send incumbent INA333-class PNs, rail, and weighing/sensor targets to Jarwey: kerry.w@jarwey.cn · Contact. Datasheets, selection, application help, sampling/small batch, lead-time coordination.
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