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Texas Instruments INA333SKGD1
- Part No.:
- INA333SKGD1
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- Die
- Datasheet:
-
INA333SKGD1.pdf
- Description:
- IC INST AMP 1 CIRCUIT 0XCEPT
- Quantity:
- Payment:
- Shipping:
Inventory:2,808
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Product details
Overview
INA333SKGD1 from Texas Instruments is a high-temperature, micro-power, zero-drift instrumentation amplifier in bare die (KGD) form, specified for operation from –55°C to +210°C. It delivers 25 μV max input offset voltage (G ≥100), 0.2 μV/°C drift (G ≥1000), 100 dB min CMRR (G ≥10), rail-to-rail output swing, and 198 μA max quiescent current - enabling precision signal conditioning in down-hole drilling sensors and extreme-environment industrial monitoring.
For engineers reviewing the INA333SKGD1 datasheet, INA333SKGD1 pinout, INA333SKGD1 application, or INA333SKGD1 equivalent, this page provides verified technical context, validated pin functions, confirmed high-temperature performance limits, and real-world substitution guidance for ruggedized analog front-end design.
Technical Context
The INA333SKGD1 implements a 3-op-amp architecture with auto-calibration circuitry that corrects offset every 8 μs, eliminating flicker noise and enabling ultra-low drift over its full –55°C to +210°C operating range. Its RFI-filtered inputs integrate 8-MHz passive RC networks at VIN+ and VIN– to suppress RF interference in noisy industrial environments.
Gain is set by a single external resistor (RG) between pins 1 and 8 using G = 1 + (100 kΩ/RG); the internal 100-kΩ laser-trimmed feedback resistors ensure ±0.01% gain accuracy at G = 100 and ±0.43% at G = 1000 (VS = 5.5 V). Input common-mode range extends from (V–) + 0.1 V to (V+) – 0.1 V, and output swings to within 50 mV of rails under load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Temp Range | –55°C to +210°C - qualified for continuous operation in down-hole, aerospace, and nuclear instrumentation systems |
| Input Offset Voltage | ±25 μV max (G ≥100, TA = 25°C) - enables sub-μV-level dc measurement accuracy in strain gauge and thermocouple interfaces |
| Offset Drift | 0.2 μV/°C (G ≥1000, 125°C to +210°C) - ensures stable calibration over extended thermal cycles without recalibration |
| CMRR | 100 dB min (G ≥10, DC–60 Hz) - rejects power-line and motor-drive common-mode noise in industrial sensor nodes |
| Supply Range | +1.8 V to +5.5 V - supports battery-powered portable diagnostics and low-voltage embedded controllers |
| Quiescent Current | 198 μA max (TA = +210°C) - allows multi-year operation on coin-cell batteries in remote condition-monitoring nodes |
| Bandwidth | 3.1 kHz (G = 100) - sufficient for slow-varying physical parameters including pressure, temperature, and vibration envelope detection |
Pinout & Package
Bare die (KGD) package with aluminum-silicon-copper metallization, 15-mil thickness, silicon backside, and no encapsulation - intended for hybrid assembly, ceramic substrate mounting (e.g., HKJ/HKQ packages), or custom hermetic packaging.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (RG) | External gain-setting resistor connection | Connects to one end of RG; forms G = 1 + (100 kΩ/RG); requires low-parasitic layout to maintain CMRR above 10 kHz |
| 2 (VIN–) | Inverting input terminal | Differential input node with RFI filter; must be biased within (V–)+0.1 V to (V+)–0.1 V for linear operation |
| 3 (VIN+) | Non-inverting input terminal | Differential input node with RFI filter; matched to VIN– for optimal CMRR; requires bias current return path |
| 4 (NC) | No-connect pad | Unbonded metallization pad; electrically isolated - must remain floating in PCB layout |
| 5 (V–) | Negative supply rail | Reference for internal amplifiers; connects to system ground or negative rail; backside potential tied to V– |
| 6 (REF) | Output reference terminal | Low-impedance output reference point; must be connected to low-noise mid-supply or ground to preserve CMRR |
| 7 (VOUT) | Amplified output | Rail-to-rail output capable of sourcing/sinking ±36 mA; settles to 0.001% in 530 μs at G = 100 |
| 8 (V+) | Positive supply rail | Power supply input; absolute max +7 V; bypass capacitor required within 2 mm for stability |
Key Features
| Feature | Design Value |
|---|---|
| Zero-drift auto-calibration | Continuous 350-kHz correction cycle eliminates 1/f noise and ensures <0.2 μV/°C drift up to +210°C |
| RFI-filtered inputs | Integrated 8-MHz RC filters on VIN+ and VIN– suppress GSM, WiFi, and motor drive EMI without external components |
| Single-resistor gain setting | G = 1 + (100 kΩ/RG) enables precise, field-adjustable gain from 1 to 1000 with standard 1% resistors |
| Ultra-low quiescent current | 198 μA max at +210°C allows deployment in energy-harvested or battery-limited edge nodes for >5 years |
| High CMRR over temperature | 100 dB min maintained from –55°C to +210°C at G ≥10, critical for rejecting thermal EMF and ground-loop noise |
Applications
| Down-Hole Drilling Sensors | High-Temperature Industrial Monitoring |
|---|---|
Use Scenario: Measuring strain and pressure in oil/gas wellbore tools exposed to 200°C ambient and mechanical shock. IC Role / Device Role / Timing Role: Precision instrumentation amplifier conditioning bridge outputs from piezoresistive sensors before ADC digitization. Use Value: 0.2 μV/°C drift and 210°C rating eliminate thermal zero-shift errors, enabling accurate real-time reservoir modeling without field recalibration. | Use Scenario: Monitoring bearing temperature and vibration in turbine engines where ambient exceeds 150°C. IC Role / Device Role / Timing Role: Front-end signal conditioner for thermocouples and IEPE accelerometers in engine control units. Use Value: RFI-filtered inputs reject ignition noise and VFD harmonics; rail-to-rail output drives 12-bit SAR ADCs directly with no level-shifting circuitry. |
| Nuclear Reactor Instrumentation | Aerospace Avionics Health Monitoring |
Use Scenario: Long-duration radiation-hardened sensor nodes inside reactor containment vessels. IC Role / Device Role / Timing Role: Low-power, drift-stable amplifier for neutron flux detectors and coolant flow sensors. Use Value: 198 μA max IQ at +210°C enables multi-decade deployment on limited primary power; controlled baseline ensures lot-to-lot parametric consistency. | Use Scenario: Structural health monitoring on hypersonic vehicle skins experiencing rapid thermal transients. IC Role / Device Role / Timing Role: Signal conditioner for embedded FBG and MEMS strain gauges in flight control surfaces. Use Value: Auto-calibration maintains sub-μV offset stability across –55°C to +210°C thermal cycling, preserving integrity of fatigue-life algorithms. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar instrumentation amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA333SJD | Same die, MSOP-8 packaged; 210°C rated; includes molded plastic body and leadframe | Requires PCB footprint change; less suitable for hermetic or high-reliability hybrid assemblies | Select when board-level assembly, reflow compatibility, and JEDEC-standard handling are prioritized over bare-die integration flexibility |
| INA128HT | Fixed-gain (5, 10, 100, 500) variants; higher 500-μA IQ; 125°C max standard rating (HT version rated to 210°C) | Lacks programmable gain; wider offset (125 μV max); lower CMRR (90 dB min) | Select when fixed-gain topology simplifies layout and cost sensitivity outweighs need for ultra-low drift and programmable gain |
Compared with INA333SJD, INA333SKGD1 offers direct hybrid integration and superior thermal interface control; compared with INA128HT, it delivers 5× lower offset drift and 10× lower quiescent current at +210°C - making it essential for long-life, ultra-stable analog front ends.
Availability
INA333SKGD1 is available at Aetrix Electronics and suitable for down-hole drilling sensors, nuclear instrumentation systems, and aerospace avionics requiring stable component supply across extended temperature lifecycles.
Supply support for INA333SKGD1 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor leader specializing in analog and embedded processing technologies, with deep expertise in high-reliability, high-temperature IC design.
The INA333 product line was engineered specifically for extreme-environment signal conditioning - delivering zero-drift precision, RFI immunity, and guaranteed operation to +210°C in bare die and surface-mount formats.
FAQ
What is the maximum operating temperature of the INA333SKGD1?
The INA333SKGD1 is fully specified and tested for continuous operation from –55°C to +210°C. Its electrical characteristics - including offset voltage, drift, CMRR, and bandwidth - are guaranteed across this entire range per SBOS514C. The device uses TI's high-temperature silicon process and packaging controls to ensure reliability at junction temperatures up to +210°C.
Does the INA333SKGD1 require external capacitors for stability?
Yes, the INA333SKGD1 requires a 0.1-μF ceramic bypass capacitor placed as close as possible (<2 mm) across V+ (pin 8) and V– (pin 5). No additional compensation is needed for unity-gain stability, but for gains >100 at +210°C, TI recommends adding a 3.5-kΩ resistor in series with a 10-nF capacitor to each RG pin (1 and 8) to maintain phase margin.
Can the INA333SKGD1 be used with single-supply operation?
Yes, the INA333SKGD1 operates from +1.8 V to +5.5 V single supply. For proper linear operation, both VIN+ and VIN– must remain ≥0.1 V above V– (ground), and the REF pin must be biased to a stable mid-supply voltage (e.g., via resistor divider or low-noise buffer). Output swing is limited to within 50 mV of rails under 10-kΩ load.
What is the purpose of the NC pad (pin 4) on the INA333SKGD1 die?
Pin 4 is an unconnected (NC) metallization pad on the INA333SKGD1 bare die - electrically isolated with no internal connection. It must remain floating in the hybrid assembly layout and should not be bonded, grounded, or connected to any trace, as doing so may compromise parametric performance or cause latch-up.
How does the RFI filtering work on the INA333SKGD1 inputs?
The INA333SKGD1 integrates passive RC low-pass filters directly at VIN+ (pin 3) and VIN– (pin 2), each with an 8-MHz cutoff frequency. These on-die filters attenuate high-frequency electromagnetic interference - such as from switching power supplies, motor drives, or radio transmitters - before it reaches the input amplifiers, reducing measured offset variation caused by RFI without requiring external components.
INA333SKGD1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- Die
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- Instrumentation
- Number of Circuits:
- 1
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 0.16V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 150 kHz
- Current - Input Bias:
- 70 pA
- Voltage - Input Offset:
- 10 µV
- Current - Supply:
- 50µA
- Current - Output / Channel:
- 40 mA
- Voltage - Supply Span (Min):
- 1.8 V
- Voltage - Supply Span (Max):
- 5.5 V
- Operating Temperature:
- -55°C ~ 210°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- 0-XCEPT
INA333SKGD1 FAQ
1.How can I place an order for INA333SKGD1 through Aetrix?
Please submit a Request for Quotation (RFQ) for INA333SKGD1 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for INA333SKGD1 reliable?
The price and inventory of INA333SKGD1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA333SKGD1 is usually 5 days.
3.What payment methods are accepted for INA333SKGD1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA333SKGD1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA333SKGD1?
INA333SKGD1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA333SKGD1 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for INA333SKGD1?
For technical support, including INA333SKGD1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA333SKGD1 requirements.
6.How does Aetrix verify that INA333SKGD1 is sourced from the original manufacturer or authorized distributors?
All INA333SKGD1 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that INA333SKGD1 meets industry standards.
7.What is the process for return or replacement of INA333SKGD1?
All INA333SKGD1 units undergo pre-shipment inspection (PSI). If there is an issue with INA333SKGD1, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The INA333SKGD1 part is unused and in its original packaging.
Return procedure for INA333SKGD1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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