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Texas Instruments INA317IDGKT
- Part No.:
- INA317IDGKT
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
INA317IDGKT.pdf
- Description:
- IC OPAMP ZER-DRIFT 1CIRC 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:423
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Product details
Overview
INA317IDGKT from Texas Instruments is a micro-power (50 µA), zero-drift, rail-to-rail-out instrumentation amplifier designed for precision DC-coupled signal conditioning in low-voltage sensor interfaces. It delivers 75 µV max offset voltage (G ≥100), 0.3 µV/°C max drift, 50 nV/√Hz input noise, 100 dB min CMRR (G ≥10), and operates from 1.8 V to 5.5 V supply - enabling high-accuracy bridge and ECG amplification in battery-powered medical and industrial systems.
For engineers reviewing the INA317IDGKT datasheet, INA317IDGKT pinout, INA317IDGKT application, or INA317IDGKT equivalent, key selection criteria include its RFI-filtered inputs, single-resistor programmable gain (G = 1 + 100 kΩ/RG), 8-pin VSSOP package with thermal resistance of 169.5 °C/W, and guaranteed operation from –40°C to +125°C.
Technical Context
The INA317IDGKT implements a three-op-amp architecture with laser-trimmed internal resistors for high common-mode rejection and low gain error. Its autocalibration circuit corrects offset every 8 µs using a 350-kHz continuous-time core, eliminating flicker noise and aliasing while maintaining DC precision.
Input stage features RFI-filtered inputs with integrated 50 kΩ/150 kΩ RC networks, and the reference pin (REF) sets output common-mode level with ≤15 Ω stray resistance required to maintain specified CMRR. Gain is set externally between pins 1 and 8 via RG, supporting G = 1 to 1000 per industry-standard equation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 1.8 V to 5.5 V - enables direct integration into 3.3 V and 5 V systems, including single-supply portable designs. |
| Quiescent Current | 50 µA - supports multi-year battery life in always-on sensor nodes and wearable medical devices. |
| Offset Voltage | 75 µV max (G ≥100) - ensures sub-0.01% measurement accuracy in 10 mV full-scale bridge applications. |
| CMRR | 100 dB min (G ≥10) - rejects >99.99% of common-mode interference from noisy industrial environments. |
| Input Noise | 50 nV/√Hz (G ≥100) - preserves signal integrity in low-level thermocouple and RTD measurements down to DC. |
| Operating Temp | –40°C to +125°C - qualified for under-hood automotive, industrial control, and downhole sensing applications. |
| Gain Range | G = 1 to 1000 - configured by single external resistor (RG), simplifying BOM and layout vs. fixed-gain alternatives. |
Pinout & Package
The INA317IDGKT is housed in an 8-pin VSSOP package (3.00 mm × 3.00 mm body size) optimized for space-constrained PCB layouts and thermal performance (RθJA = 169.5 °C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 8 | RG | Gain-setting terminals - connect external resistor to define G = 1 + 100 kΩ/RG; sensitive to parasitic capacitance & layout symmetry. |
| 2 | VIN− | Inverting input - RFI-filtered with internal 150 kΩ resistor and capacitor network for EMC robustness. |
| 3 | VIN+ | Non-inverting input - RFI-filtered identically to VIN−; requires matched bias current return path for optimal CMRR. |
| 4 | V− | Negative supply - supports single-supply (1.8–5.5 V) or dual-supply (±0.9 V to ±2.75 V) operation. |
| 5 | REF | Reference input - sets output common-mode voltage; must be driven by low-impedance source (<15 Ω) to preserve CMRR. |
| 6 | VOUT | Amplified output - rail-to-rail swing (V− + 50 mV to V+ − 50 mV at RL = 10 kΩ) enables full dynamic range utilization. |
| 7 | V+ | Positive supply - decoupling capacitor required close to pin for stability and noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Zero-drift autocalibration | Continuous 350-kHz correction every 8 µs eliminates 1/f noise and ensures stable DC accuracy over time and temperature. |
| Laser-trimmed resistors | On-chip 150 kΩ feedback network guarantees 100 dB CMRR (G ≥10) and <0.25% gain error at G = 1000 without external trimming. |
| RFI-filtered inputs | Integrated 50 kΩ/150 kΩ RC filters suppress RF interference up to 1 GHz, reducing need for external EMI protection components. |
| Rail-to-rail output | Swings within 50 mV of supply rails at 10 kΩ load, maximizing ADC utilization in low-voltage 1.8 V–3.3 V data acquisition systems. |
| Low input bias current | 200 pA max enables direct connection to high-impedance sources like pH electrodes and piezoresistive sensors without signal degradation. |
Applications
| Bridge Amplifiers | ECG Amplifiers |
|---|---|
Use Scenario: Amplifying µV-level differential signals from strain-gauge or load-cell Wheatstone bridges in weigh scales and industrial force sensors. IC Role / Device Role / Timing Role: Precision instrumentation amplifier providing high CMRR and low drift to reject bridge excitation noise and thermal offsets. Use Value: Enables 24-bit resolution measurement with <1 µV input-referred noise floor and no external offset trimming required. | Use Scenario: Conditioning low-amplitude, high-impedance biopotential signals from dry or gel-based ECG electrodes in portable monitors. IC Role / Device Role / Timing Role: Front-end INA with RFI filtering and rail-to-rail output driving 12–16-bit SAR ADCs in ultra-low-power wearable systems. Use Value: Delivers 0.3 µV/°C drift and 50 nV/√Hz noise to resolve P/QRS/T waveforms without baseline wander or motion artifact amplification. |
| Pressure Sensors | Thermocouple Amplifiers |
Use Scenario: Signal conditioning for MEMS-based absolute or differential pressure transducers in HVAC and medical ventilators. IC Role / Device Role / Timing Role: Low-quiescent-current (50 µA) amplifier interfacing millivolt-output sensors to low-power microcontrollers with integrated ADCs. Use Value: Supports battery-only operation for >5 years while maintaining <0.1% FS accuracy across –40°C to +85°C ambient range. | Use Scenario: Cold-junction-compensated amplification of Type-K/J thermocouple outputs in industrial process controllers and furnace monitoring. IC Role / Device Role / Timing Role: Precision DC-coupled amplifier with laser-trimmed gain resistors ensuring stable 100:1 gain over temperature for linearized mV/°C scaling. Use Value: Eliminates external gain-setting resistors and trim pots, reducing calibration labor and long-term drift in Class I, Division 2 hazardous locations. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar instrumentation amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD8421ARMZ | Higher quiescent current (350 µA), wider supply (±2.5 V to ±18 V), no RFI filtering, 10x higher cost | Better for high-voltage industrial isolation amps; unsuitable for battery-powered designs due to power draw | Select AD8421ARMZ only when >100 kHz bandwidth or >±15 V supplies are required - not a drop-in replacement. |
| INA333AIDGKR | Same zero-drift architecture and 50 µA IQ, but fixed G = 1,5,10,100; no external RG pins; smaller 8-pin VSSOP footprint | Ideal for cost-sensitive, fixed-gain applications where gain flexibility is unnecessary | Choose INA333AIDGKR to reduce BOM count and layout complexity when gain is known and unchanging. |
Compared with AD8421ARMZ and INA333AIDGKR, the INA317IDGKT uniquely balances micro-power operation, programmable gain via single resistor, and integrated RFI filtering - making it optimal for portable, battery-constrained, and EMC-sensitive sensor front-ends where design flexibility and long service life are critical.
Availability
INA317IDGKT is available at Aetrix Electronics and suitable for bridge amplifiers, ECG monitors, and pressure sensor interfaces requiring stable component supply across automotive, industrial, and medical OEM programs.
Supply support for INA317IDGKT 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 delivering analog and embedded processing solutions for industrial, automotive, and personal electronics markets.
The INA317 product line targets ultra-low-power, high-precision sensor signal conditioning - specifically engineered for battery-operated medical devices, portable instrumentation, and harsh-environment industrial sensing where DC accuracy and EMC resilience are non-negotiable.
FAQ
What is the maximum gain achievable with INA317IDGKT and how is it set?
The INA317IDGKT supports gains from G = 1 to G = 1000, set by a single external resistor (RG) connected between pins 1 and 8 using the equation G = 1 + (100 kΩ / RG). For G = 1000, RG = 100 Ω (nearest 1% value); for G = 1, pins 1 and 8 are left unconnected. The internal laser-trimmed 150 kΩ resistors ensure gain accuracy remains within ±0.25% at G = 1000 across temperature. The INA317IDGKT datasheet specifies performance only up to G = 1000 - higher gains risk instability and degraded CMRR.
Does INA317IDGKT require external capacitors on the RG pins for stability?
Yes - the INA317IDGKT requires careful RG pin layout to avoid parasitic capacitance exceeding a few picofarads, which can cause peaking or oscillation. TI recommends symmetric routing, avoiding vias or stubs near pins 1 and 8, and using surface-mount RG resistors placed directly between the pins. No external bypass capacitors are needed on RG itself, but 0.1 µF ceramic decoupling capacitors must be placed close to V+ (pin 7) and V− (pin 4) to ensure power-supply stability. The INA317IDGKT's internal autocalibration loop remains unaffected by proper RG implementation.
Can INA317IDGKT operate from a 1.8 V single supply and still achieve rail-to-rail output?
Yes - the INA317IDGKT is fully specified from 1.8 V to 5.5 V single supply and delivers rail-to-rail output swing (V− + 50 mV to V+ − 50 mV at RL = 10 kΩ). At 1.8 V, this yields a usable output range of 0.05 V to 1.75 V, sufficient for driving 12-bit ADCs with >4090 effective codes. Input common-mode range is (V−) + 0.1 V to (V+) − 0.1 V, so at 1.8 V supply, inputs must stay within 0.1 V to 1.7 V. The INA317IDGKT maintains 50 µA quiescent current and 75 µV max offset even at minimum supply.
How does the REF pin affect common-mode rejection in INA317IDGKT?
The REF pin sets the output common-mode voltage and is critically sensitive to impedance: stray resistance >15 Ω in series with REF degrades CMRR by >10 dB. To preserve the specified 100 dB CMRR (G ≥10), REF must be driven by a low-impedance source - typically a buffered voltage divider or dedicated reference IC. Connecting REF directly to ground or midsupply via a short, wide trace is acceptable; using long traces, connectors, or series resistors invalidates CMRR specs. This requirement applies identically across all operating conditions of the INA317IDGKT.
Is INA317IDGKT suitable for thermocouple amplification with cold-junction compensation?
Yes - the INA317IDGKT is widely used in thermocouple front-ends due to its 0.3 µV/°C max offset drift, 50 nV/√Hz low-frequency noise, and ability to resolve µV-level differentials. When paired with an external cold-junction sensor (e.g., TMP35) and summing amplifier, the INA317IDGKT provides stable, low-drift gain without trimming. Its RFI filtering suppresses EMI from heating elements, and operation down to –40°C ensures reliability in freezer or outdoor installations. All key parameters for thermocouple use - including input bias current (200 pA max) and input voltage range - are fully characterized in the INA317IDGKT datasheet.
INA317IDGKT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- Zero-Drift
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- Zero-Drift
- 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:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-VSSOP
INA317IDGKT FAQ
1.How can I place an order for INA317IDGKT through Aetrix?
Please submit a Request for Quotation (RFQ) for INA317IDGKT 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 INA317IDGKT reliable?
The price and inventory of INA317IDGKT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA317IDGKT is usually 5 days.
3.What payment methods are accepted for INA317IDGKT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA317IDGKT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA317IDGKT?
INA317IDGKT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA317IDGKT 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 INA317IDGKT?
For technical support, including INA317IDGKT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA317IDGKT requirements.
6.How does Aetrix verify that INA317IDGKT is sourced from the original manufacturer or authorized distributors?
All INA317IDGKT 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 INA317IDGKT meets industry standards.
7.What is the process for return or replacement of INA317IDGKT?
All INA317IDGKT units undergo pre-shipment inspection (PSI). If there is an issue with INA317IDGKT, 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 INA317IDGKT part is unused and in its original packaging.
Return procedure for INA317IDGKT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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