Key Selection Information
| Selection Parameter | Confirmed Information |
|---|---|
| Architecture | Zero-drift precision instrumentation amplifier |
| Supply | 1.8 V to 5.5 V |
| Quiescent Current | 50 µA |
| Gain Range | 1 V/V to 1000 V/V with one external resistor |
| Offset / Drift | 25 µV maximum and 0.1 µV/°C at G ≥ 100 |
| Input Bias | 200 pA maximum |
| Output | Rail-to-rail output with RFI-filtered inputs |
| Exact Package / Packing | VSSOP (DGK), 8 pins; 2500-piece large tape and reel |
Product Overview
INA333AIDGKR is a micropower zero-drift instrumentation amplifier for low-voltage sensor front ends. It operates from 1.8 V to 5.5 V, consumes about 50 µA, and uses auto-calibration techniques to hold offset drift to 0.1 µV/°C at high gain.
The DGKR order code uses the leaded VSSOP package. Compared with the electrically similar INA333AIDRGR SON option, the VSSOP exposes all leads for optical inspection and hand rework and avoids the assembly requirements of an exposed-pad leadless package. That can matter in prototypes, lower-volume medical/industrial boards or designs with conservative manufacturing rules.
The very low bias current suits high-source-impedance sensors, while rail-to-rail output helps use limited ADC range on a low-voltage single supply. Input common-mode range is close to the rails but still must be checked against gain and output swing.
For related devices, see HKEQGOO’s Instrumentation Amplifiers category.
Technical Specifications
| Parameter | Verified Information |
|---|---|
| Manufacturer | Texas Instruments |
| Exact MPN | INA333AIDGKR |
| Architecture | Zero-drift precision instrumentation amplifier |
| Supply | 1.8 V to 5.5 V |
| Quiescent Current | 50 µA |
| Gain Range | 1 V/V to 1000 V/V with one external resistor |
| Offset / Drift | 25 µV maximum and 0.1 µV/°C at G ≥ 100 |
| Input Bias | 200 pA maximum |
| Output | Rail-to-rail output with RFI-filtered inputs |
| Exact Package / Packing | VSSOP (DGK), 8 pins; 2500-piece large tape and reel |
| Manufacturer Status | Active / Production |
| Part Marking | I333 |
Functional Highlights
Zero drift targets DC accuracy at very low power
The 50 µA current and auto-calibrated offset make INA333 attractive for bridge, RTD and slowly varying sensor signals where DC drift matters more than low broadband noise.
Leaded VSSOP can be the better manufacturing choice
For the same INA333 electrical core, DGKR favors visible solder joints and easier rework. The DRGR SON order code favors a compact leadless footprint instead.
Design Considerations
- Check input common-mode and output swing together at the selected gain.
- Use a precision RG at high gain because the external resistor contributes gain error and drift.
- If assembly inspection or field rework is important, preserve the DGK package rather than substituting the leadless DRG option.
Product Status and Exact Order Code
Manufacturer status: Active / Production
Texas Instruments lists INA333AIDGKR as Active / Production; VSSOP (DGK), 8 pins; 2500-piece large tape and reel; Level-2-260C-1 YEAR; −40°C to +125°C; marking I333.
Related Engineering Resources
Quality & Verification Support
Third-party inspection or testing can be arranged according to customer requirements. Testing fees are borne by the buyer. Additional verification requirements can be discussed before shipment. After an order is placed, physical product, label, packaging, and Date Code photos may be provided where appropriate.
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