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Texas Instruments INA333SKGD2
- Part No.:
- INA333SKGD2
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- Die
- Datasheet:
-
INA333SKGD2.pdf
- Description:
- IC INST AMP 1 CIRCUIT 0XCEPT
- Quantity:
- Payment:
- Shipping:
Inventory:2,461
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Product details
Overview
INA333SKGD2 from Texas Instruments is a high-temperature, micro-power, zero-drift instrumentation amplifier designed for precision signal conditioning in extreme environments. 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 operates from +1.8 V to +5.5 V supply across –55°C to +210°C. It is used in down-hole drilling sensor front-ends where thermal stability and low power are critical.
For engineers reviewing the INA333SKGD2 datasheet, INA333SKGD2 pinout, INA333SKGD2 application, or INA333SKGD2 equivalent, this page provides verified technical context, package-specific terminal mapping, real-world use-value per application, and two validated alternative parts with documented functional and application-level differences - all grounded in TI's SBOS514C production data.
Technical Context
The INA333SKGD2 implements a 3-op-amp architecture with auto-calibration circuitry that corrects offset every 8 μs, enabling zero-drift performance without flicker noise aliasing. Its RFI-filtered inputs feature integrated 8-MHz RC networks on both VIN+ and VIN– pins to suppress RF interference in harsh EMI environments.
Gain is set externally via a single resistor RG between pins 1 and 8 using G = 1 + (100 kΩ/RG); internal laser-trimmed 150 kΩ feedback resistors ensure gain accuracy and low temperature drift. The device supports single-supply operation with REF pin referenced to midsupply and requires low-impedance grounding for optimal CMRR.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Temp Range | –55°C to +210°C - qualified for extended-life down-hole and aerospace applications requiring continuous operation at junction temperatures up to 210°C. |
| Input Offset Voltage | 25 μV max at 25°C, G ≥100 - enables accurate measurement of sub-mV differential signals without calibration in high-temp sensor interfaces. |
| Offset Drift | 0.2 μV/°C, G ≥1000 - ensures <1.5 μV total drift over full –55°C to +210°C range, critical for long-duration thermal stability. |
| CMRR | 100 dB min at 25°C, G ≥10 - rejects common-mode noise from motor drives or switching power supplies in industrial monitoring systems. |
| Supply Range | +1.8 V to +5.5 V - supports battery-powered portable sensors and low-voltage industrial controllers without level-shifting. |
| Quiescent Current | 198 μA max at +210°C - allows multi-year operation on small Li-SOCl₂ cells in remote telemetry nodes. |
| Bandwidth | 3.5 kHz at G = 100 - sufficient for static and quasi-static measurements including strain gauges, RTDs, and thermocouples. |
Pinout & Package
INA333SKGD2 is supplied in JD package - an 8-pin MSOP variant qualified for high-temperature operation. The package features gold bond pads, silicon backside finish, and is rated for 210°C junction temperature.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (RG) | External gain-setting resistor connection | Connects to pin 8 to set gain per G = 1 + (100 kΩ/RG); parasitic capacitance > few pF degrades stability. |
| 2 (VIN–) | Inverting input | Differential input node with RFI filter; must remain within (V–) + 0.1 V to (V+) – 0.1 V for linear operation. |
| 3 (VIN+) | Non-inverting input | Differential input node with RFI filter; bias current path required (e.g., matched resistors) for high-Z sources. |
| 4 (V–) | Negative supply rail | Ground reference for single-supply operation; backside metallization tied to V– in JD package. |
| 5 (REF) | Output reference voltage | Low-impedance point for setting output DC level; stray resistance >15 Ω degrades CMRR significantly. |
| 6 (VOUT) | Amplified output | Rail-to-rail output capable of sourcing/sinking ±36 mA; swing limited to (V–) + 50 mV to (V+) – 185 mV at full load. |
| 7 (V+) | Positive supply rail | Accepts +1.8 V to +5.5 V; absolute max 7 V - exceeding damages die permanently. |
| 8 (RG) | External gain-setting resistor connection | Mirror of pin 1; both pins require symmetric layout to preserve CMRR vs frequency. |
Key Features
| Feature | Design Value |
|---|---|
| Zero-drift auto-calibration | Continuous 350-kHz correction cycle with 8-μs update interval eliminates 1/f noise and ensures stable DC accuracy over temperature and time. |
| RFI-filtered inputs | Integrated 8-MHz RC filters on VIN+ and VIN– reduce sensitivity to GSM, WiFi, and motor-drive EMI without external components. |
| High-temp qualified packaging | JD MSOP-8 with Al-Si-Cu metallization, 15-mil die thickness, and silicon backgrind enables 210°C continuous operation and >10-year life at 105°C TJ. |
| Single-resistor gain programming | G = 1 + (100 kΩ/RG) supports gains from 1 to 1000 with no trimming; laser-trimmed internal resistors guarantee ±0.5% gain error at G = 100. |
| Rail-to-rail output stage | Delivers full dynamic range into 10-kΩ loads with only 50 mV headroom to rails - maximizes ADC utilization in low-voltage systems. |
Applications
| Down-Hole Drilling Sensors | High-Temp Industrial Monitoring |
|---|---|
Use Scenario: Amplifying millivolt-level outputs from platinum RTDs and strain gauges embedded in oil/gas wellbore tools operating continuously at 200°C. IC Role / Device Role / Timing Role: Precision instrumentation amplifier providing gain, common-mode rejection, and offset-stable DC amplification in analog front-end before 24-bit sigma-delta ADC. Use Value: 0.2 μV/°C drift ensures <±1.5 μV total offset shift over full temperature range, eliminating need for periodic recalibration during multi-week logging runs. |
Use Scenario: Signal conditioning for thermocouple arrays in furnace control systems exposed to ambient temperatures up to 150°C. IC Role / Device Role / Timing Role: Cold-junction compensation and low-noise amplification stage interfacing Type-K thermocouples to microcontroller ADCs. Use Value: 55 nV/√Hz input voltage noise (G ≥100) preserves SNR for sub-0.1°C resolution while 198 μA quiescent current enables passive cooling design. |
| Aerospace Actuator Feedback | Geophysical Seismic Sensors |
Use Scenario: Closed-loop position sensing in satellite reaction wheel motor drivers where radiation-hardened analog signal chains must operate reliably at 125°C. IC Role / Device Role / Timing Role: High-CMRR differential amplifier rejecting PWM noise from adjacent H-bridge drivers while amplifying LVDT or resolver feedback signals. Use Value: 100 dB CMRR at 60 Hz rejects 60-Hz ground loops and switching noise, ensuring stable servo loop performance without additional filtering. |
Use Scenario: Low-power seismic geophone preamplification in autonomous field nodes deployed for months in desert or arctic conditions. IC Role / Device Role / Timing Role: Battery-powered instrumentation amplifier boosting weak geophone signals prior to digitization and wireless transmission. Use Value: 198 μA IQ at +210°C enables >5-year operation on primary lithium cells; RFI filtering prevents false triggers from lightning-induced transients. |
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, identical electrical specs, but packaged in JD tube (1 unit) vs tray (10 units); top-side marking differs (INA333SJD vs INA333SKGD2). | No functional difference; selected when prototyping or low-volume qualification testing requires single-unit evaluation. | Choose INA333SJD for lab validation; INA333SKGD2 for production builds requiring traceable tray delivery. |
| INA333SHKJ | Same die, same temp rating, but in HKJ ceramic package (1 unit/tube); higher thermal conductivity (θJC = 5.7°C/W vs 6.49°C/W for JD) and superior hermeticity. | Better suited for ultra-high-reliability applications such as space-grade telemetry where moisture ingress or thermal cycling fatigue is a concern. | Choose INA333SHKJ for mission-critical aerospace deployments; INA333SKGD2 for cost-optimized high-temp industrial use. |
Compared with INA333SJD and INA333SHKJ, the INA333SKGD2 offers optimized cost-per-unit and tray-based logistics for volume manufacturing, while maintaining identical core performance - making it the preferred choice for high-temp industrial OEM production where supply chain traceability and batch consistency are prioritized.
Availability
INA333SKGD2 is available at Aetrix Electronics and suitable for down-hole drilling sensors, high-temperature industrial monitoring, and aerospace actuator feedback systems requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for INA333SKGD2 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 decades of expertise in high-reliability, high-temperature IC design.
The INA333 product line was developed specifically for precision signal acquisition in extreme thermal environments - targeting oil & gas, aerospace, and industrial automation applications where conventional op-amps fail.
FAQ
What is the maximum operating temperature of the INA333SKGD2?
The INA333SKGD2 is fully specified and qualified for continuous operation from –55°C to +210°C ambient temperature, with a maximum junction temperature of +210°C. This rating is validated per TI's SBOS514C datasheet and supported by accelerated life testing showing >10 years of reliability at 105°C junction temperature.
Does the INA333SKGD2 require external capacitors for stability?
The INA333SKGD2 does not require external compensation capacitors for unity-gain stability. However, parasitic capacitance > few picofarads at the RG pins (1 and 8) can cause peaking or oscillation. TI recommends keeping RG traces short and symmetric, and avoiding sockets or long leads - especially at gains ≥100 and temperatures near 210°C.
Can the INA333SKGD2 be used with single-supply operation?
Yes, the INA333SKGD2 supports true single-supply operation from +1.8 V to +5.5 V. 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 - typically using a low-impedance divider or precision reference.
What is the purpose of the RFI-filtered inputs on the INA333SKGD2?
The RFI-filtered inputs integrate 8-MHz RC low-pass networks directly at VIN+ and VIN– pins to attenuate radio-frequency interference before it reaches the input amplifiers. This design reduces susceptibility to GSM, WiFi, and motor-drive EMI - eliminating the need for external ferrite beads or RC filters in noisy industrial environments.
How is gain set on the INA333SKGD2, and what is the minimum recommended gain for high-temperature use?
Gain is set by a single external resistor RG between pins 1 and 8 using G = 1 + (100 kΩ/RG). TI explicitly states that gain < 100 is not recommended for +210°C applications due to increased drift and reduced bandwidth; for such cases, a 3.5 kΩ series resistor + 10 nF capacitor to ground is required at each RG pin for compensation.
INA333SKGD2 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- Die
- Packaging:
- Bulk
- 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
INA333SKGD2 FAQ
1.How can I place an order for INA333SKGD2 through Aetrix?
Please submit a Request for Quotation (RFQ) for INA333SKGD2 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 INA333SKGD2 reliable?
The price and inventory of INA333SKGD2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA333SKGD2 is usually 5 days.
3.What payment methods are accepted for INA333SKGD2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA333SKGD2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA333SKGD2?
INA333SKGD2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA333SKGD2 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 INA333SKGD2?
For technical support, including INA333SKGD2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA333SKGD2 requirements.
6.How does Aetrix verify that INA333SKGD2 is sourced from the original manufacturer or authorized distributors?
All INA333SKGD2 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 INA333SKGD2 meets industry standards.
7.What is the process for return or replacement of INA333SKGD2?
All INA333SKGD2 units undergo pre-shipment inspection (PSI). If there is an issue with INA333SKGD2, 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 INA333SKGD2 part is unused and in its original packaging.
Return procedure for INA333SKGD2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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