INA333AIDGKR - 50uA Zero-Drift INA | Texas Instruments
MPN: INA333AIDGKR ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $0.8373 | $0.84 |
| 10 | $0.8373 | $8.37 |
| 100 | $0.8373 | $83.73 |
| 500 | $0.8373 | $418.65 |
| 1,000 | $0.8373 | $837.30 |
INA333AIDGKR Overview
An instrumentation amplifier is a differential analog amplifier optimized for measuring small voltage signals superimposed on larger common-mode voltages. Its internal three-op-amp topology provides high input impedance and accurate differential gain, making it more practical than a discrete difference amplifier when source impedances are unequal or signals arrive from sensors. INA333 belongs to the precision amplifier hierarchy: instrumentation amplifier, operational amplifier, analog IC, and semiconductor.
The INA333 emphasizes low power, low offset drift, and rail-to-rail output operation. Verified source data identifies a 50 uA typical supply current and a gain equation of G = 1 + 100 kΩ/RG. The 150 kHz bandwidth supports fast sensor signals, while the 10 uV input offset specification improves measurement resolution around the zero-input condition. Its input stage is designed to reject common-mode variation encountered in bridge, current-sense, and portable sensing systems.
The zero-drift architecture reduces temperature-related offset movement, helping preserve measurement stability when the sensor signal is small relative to input offset. Rail-to-rail output increases usable output swing on low-voltage supplies, although engineers must still verify input common-mode range, output swing, bandwidth, and input bias behavior across the complete intended voltage and temperature range using the manufacturer datasheet.
Typical uses include portable medical monitoring, battery-powered industrial instrumentation, pressure and load-cell signal conditioning, low-side current measurement, and low-voltage sensor acquisition. The 50 uA power budget is especially useful for wearable and remote systems where every microamp affects battery life. The VSSOP-8 package supports compact layouts, but differential routing and gain-resistor placement remain essential.
For best results, connect the gain resistor close to the RG pins, use a low-noise reference supply, maintain symmetric input routing, and follow the datasheet bypass recommendations. Verify common-mode limits at every operating point rather than assuming rail-to-rail input. This page combines verified distributor data, manufacturer specifications, sourcing guidance, and practical design context.
Drop-in alternatives for INA333AIDGKR — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with INA333AIDGKR (same form factor and footprint) — differing in Operating Temperature Range, Package, Gain Range, Amplifier Type, Bandwidth.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
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INA332AIDGKR
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INA333AIDGKRG4
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AD8226BRZ
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MCP6N11
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INA333AIDGKR Maximum Ratings & Electrical Characteristics
| Product Type | Precision zero-drift instrumentation amplifier |
| Architecture | 3-operational-amplifier |
| Number of Channels | 1 channel |
| Supply Voltage Range | 1.8 V to 5.5 V |
| Quiescent Current | 50 uA typical |
| Input Offset Voltage | 10 uV typical |
| Gain Range | 1 to 1000 |
| Gain Equation | G = 1 + 100 kΩ/RG |
| Bandwidth | 150 kHz |
| Slew Rate | 0.16 V/us |
| Output Type | Rail-to-rail output |
| Input Filtering | RFI-filtered inputs |
| Operating Temperature Range | -40 C to +125 C |
| Package | 8-pin VSSOP (DGK) |
| Mounting Type | Surface mount |
INA333AIDGKR 8-pin vssop (dgk) Pin Configuration Guide
Pin configuration for INA333AIDGKR (8-pin vssop (dgk) package). This analog component features input, output, and power supply pins. Refer to the manufacturer datasheet for offset null, compensation, and enable pin configurations. Ideal for signal conditioning and amplifier circuits.
No detailed pinout data available for INA333AIDGKR.
Refer to the datasheet for full pin configuration.
Typical Applications
INA333AIDGKR is suitable for 6 applications: Battery-Powered Medical Sensor Conditioning, Load-Cell and Pressure Sensor Signal Conditioning, Low-Side Current Sensing, Industrial Process Signal Acquisition, Portable Environmental Monitoring, Precision Analog Measurement Front End.
Battery-Powered Medical Sensor Conditioning
The INA333AIDGKR fits low-voltage medical and wellness sensor front ends because its 1.8 V to 5.5 V supply range and 50 uA typical current suit compact battery-powered designs. A bridge, thermistor, or bio-sensor signal can feed the differential inputs, while the external RG resistor selects a gain from 1 to 1000. The 10 uV typical input offset is valuable when the sensor output is small, while the 150 kHz bandwidth accommodates many physiological signal paths. Designers should verify input common-mode range, patient-isolation requirements, electrode protection, and noise performance at the actual operating gain.
Recommended
Load-Cell and Pressure Sensor Signal Conditioning
The INA333AIDGKR is appropriate for bridge-based pressure and force measurements where the wanted differential signal is small relative to common-mode voltage. Its three-operational-amplifier architecture supports measurement of differential sensor outputs, and the 1 to 1000 gain range allows the circuit to normalize millivolt-level signals to an ADC input range. The 10 uV typical offset helps preserve low-level accuracy, while RFI-filtered inputs support practical protection against high-frequency interference. The final gain must be checked against the 150 kHz bandwidth, while sensor excitation, input filtering, and output common-mode limits must be verified from the full datasheet.
Recommended
Low-Side Current Sensing
The INA333AIDGKR can amplify the differential voltage produced across a low-side current-sense resistor when the available supply voltage and common-mode range support the measurement. Its low 50 uA supply current is useful in handheld testers, energy monitors, and portable power tools, and the selectable gain allows a small shunt drop to be scaled toward an ADC input. Design the sense path so the shunt voltage remains within the amplifier's input range at both light and full load. Also account for sense-resistor tolerance, Kelvin routing, input bias effects, and the bandwidth needed for the target current waveform.
Recommended
Industrial Process Signal Acquisition
The INA333AIDGKR is suitable for compact industrial acquisition modules that must measure small differential signals from pressure, flow, strain, and resistance bridges. Its 1.8 V minimum supply supports low-voltage sensor systems, and the 50 uA typical operating current leaves more power available for sensors, isolation, and communications. The 150 kHz bandwidth is sufficient for many process-control signals but not for unrestricted high-frequency measurement. Use symmetric input routing, controlled grounding, and careful RG placement. Industrial systems should additionally verify transient protection, isolation architecture, temperature range, and long-term calibration requirements.
Recommended
Portable Environmental Monitoring
The INA333AIDGKR supports portable environmental monitoring systems that combine low-current sensors such as resistive gas, humidity, or temperature elements with a low-voltage ADC. Its 50 uA typical supply current helps preserve battery life, and its programmable gain can adapt the sensor output to the converter's input range. The 10 uV typical offset is useful when measuring signals near zero, but the engineer must account for sensor self-heating and leakage. Keep the RG resistor close to the IC, bypass the supply, and confirm that the selected gain does not exceed the available input common-mode range or output swing.
Recommended
Precision Analog Measurement Front End
The INA333AIDGKR is well suited to precision analog acquisition blocks where a small differential signal must be measured before conversion by an ADC or mixed-signal controller. The rail-to-rail output can improve usable signal range on a low-voltage supply, while the zero-drift architecture helps maintain offset stability over temperature. Its 150 kHz bandwidth accommodates many sensor and instrumentation signals, but applications requiring substantially faster transients should use a different amplifier. Confirm input filtering, settling behavior, ADC drive requirements, and the exact gain-setting resistor tolerance in the complete signal-chain design.
Recommended
Recommended Products Summary
Engineering reference data for INA333AIDGKR — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | INA333AIDGKT | INA332AIDGKR | INA333AIDGKRG4 | AD8226 | MAX4466 |
|---|---|---|---|---|---|---|
| Product Type | Precision zero-drift instrumentation amplifier | Low-power precision instrumentation amplifier | INA33x instrumentation amplifier | INA333A instrumentation amplifier | Instrumentation amplifier candidate | Equivalent-product candidate |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Analog Devices | Maxim Integrated |
Key Differentiators
- Low-power precision architecture (vs INA333AIDGKT)
- Zero-drift measurement positioning (vs INA332AIDGKR)
- Single-resistor gain setting with broad range (vs AD8226)
Design Notes
Place the external RG gain-setting resistor as close as practical to the INA333 RG pins. Keep the differential input traces short, matched in geometry, and away from switching-regulator inductors and high-current return paths. Because the amplifier uses a precision gain-setting network, parasitic resistance and asymmetric routing can unbalance the differential signal path. Connect the input return and supply ground using a quiet analog-ground region, while maintaining the manufacturer-recommended grounding topology.
The 50 uA typical supply current is attractive for portable systems, but the complete power budget must include sensor current, gain resistor current, protection leakage, regulator quiescent current, and ADC or controller consumption. Bypass the supply close to the device according to the manufacturer datasheet, and verify that the regulator has adequate voltage headroom across battery discharge. Do not infer battery life from the amplifier current alone.
Do not assume rail-to-rail output implies unrestricted input common-mode operation. Check the INA333 input range, output swing, gain-dependent headroom, and absolute maximum ratings at the intended supply voltage and temperature. Also account for RG resistor tolerance and noise: a nominally correct gain can produce channel gain error if the resistor is not suitable for the required accuracy. Validate sensor excitation and protection networks in the complete circuit.
The verified data identifies RFI-filtered inputs, but external layout and filtering still determine real system immunity. Keep sensor leads short or use appropriate twisted/shielded routing, terminate or filter cables near the connector, and avoid long unshielded traces that can act as antennas. Evaluate conducted and radiated immunity with the actual power-supply layout, enclosure, and sensor cable because the internal filter alone does not guarantee EMC compliance.
Compliance Information
Compliance status was not explicitly stated in the supplied verified excerpts. The target is not identified as an automotive-qualified AEC-Q100 device in the provided data; verify current RoHS, REACH, lead-free, halogen-free, and conflict-minerals documentation with Texas Instruments or the authorized distributor.
