36V in-amp family for AI modules, weighing, transmitters, DAQ: COS620/128/129/8221
COSINE’s catalog lists 36V instrumentation amplifiers for: analog input modules, weighing scales, temperature transmitters, pressure transmitters, data acquisition (DAQ), and lab/field instruments. These jobs usually mean ±15 V / wide common-mode, external Rg for gain, and second-source evaluation versus INA128 / INA129 / AD620 / AD8221—not the same rail or mechanical constraints as 5V portable in-amps (COSINA333 family).
Metrics follow the 2025 catalog (gain 1–10000; see catalog for gain equations). Request datasheets from Jarwey; qualify before production. For ECG/EEG front-end detail see the earlier COS620 article—this page stays on industrial DAQ / weighing / transmitter selection.
Product features
High precision, low drift, low noise density; ~4.5–36 V (±2.25–±18); external Rg sets gain.
Applications (vendor-stated)
Analog input modules · weighing scales · temperature transmitters · pressure transmitters · DAQ · lab and field instruments.
36V instrumentation amplifier table
| PN | Supply (V) | Gain | Gain formula | BW | Noise @1kHz | Vos / drift | Iq | Cross-ref | Page |
|---|---|---|---|---|---|---|---|---|---|
| COS620BRZ | 4.5~36 (±2.25~±18) | 1~10000 | 1+49.4kΩ/Rg | 1.5 MHz | 8 nV/√Hz | 50 µV / 0.7 µV/°C | 1.3 mA | INA129 / AD620 | 864 |
| COS620ARZ | 4.5~36 (±2.25~±18) | 1~10000 | 1+49.4kΩ/Rg | 1.5 MHz | 8 nV/√Hz | 50 µV / 0.7 µV/°C | 1.3 mA | INA129 / AD620 | 918 |
| COS128U | 4.5~36 (±2.25~±18) | 1~10000 | 1+50kΩ/Rg | 1.5 MHz | 8 nV/√Hz | 50 µV / 0.7 µV/°C | 1.3 mA | INA128 | 919 |
| COS129U | 4.5~36 (±2.25~±18) | 1~10000 | 1+49.4kΩ/Rg | 1.5 MHz | 8 nV/√Hz | 50 µV / 0.7 µV/°C | 1.3 mA | INA129 / AD620 | 920 |
| COS8221ARZ | 4.5~36 (±2.25~±18) | 1~10000 | 1+49.4kΩ/Rg | 1.5 MHz | 8 nV/√Hz | 50 µV / 0.7 µV/°C | 1.3 mA | AD8221 | 921 |
For portable 5V / battery weighing domains, see 5V instrumentation amplifiers (COSINA333).
Checklist mapped to vendor applications
- Analog input / DAQ: common-mode, input protection, and 4.5–36 V supply aligned?
- Weighing: bridge excitation & resolution vs 50 µV Vos / 0.7 µV/°C; Rg calibration repeatable?
- Temp / pressure transmitters: field common-mode, cable noise, CMRR/filter plan.
- Lab / field instruments: do you truly need gain to 10000? noise & stability at high gain.
- Cross-ref split: INA128→COS128; INA129/AD620→COS620/COS129; AD8221→COS8221 (verify—not drop-in).
- Grade / suffix: ARZ/BRZ/U match temp grade and AVL.
- Samples: request datasheets and pilot qty from Jarwey before primary change.
Pages & contact
- COS620BRZ · COS620ARZ · COS128U · COS129U · COS8221ARZ
Send incumbent INA128 / INA129 / AD620 / AD8221 PNs and module type (AI / weighing / transmitter / DAQ) to Jarwey: kerry.w@jarwey.cn · Contact.
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