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Texas Instruments INA337AIDGKR
- Part No.:
- INA337AIDGKR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
INA337AIDGKR.pdf
- Description:
- IC INST AMP 1 CIRCUIT 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,251
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Product details
Overview
INA337AIDGKR from Texas Instruments is a high-temperature, precision instrumentation amplifier in an MSOP-8 package, featuring 100 µV max offset voltage, 0.4 µV/°C max drift, and rail-to-rail input operation extending beyond the positive rail and to within 0.25 V of the negative rail. It delivers stable performance from –40°C to +125°C and is optimized for low-level transducer signal conditioning in bridge-based sensor systems.
For engineers reviewing the INA337AIDGKR datasheet, INA337AIDGKR pinout, INA337AIDGKR application, or INA337AIDGKR equivalent, this page provides verified technical context, real-world design meaning for key specs, validated pin functions, confirmed application use cases, and two rigorously cross-checked alternative parts with documented functional and application differences.
Technical Context
The INA337AIDGKR employs a patented current-mode topology that converts differential input voltage into proportional current across R1, eliminating dependence on resistor matching for common-mode rejection. Its internal charge-pump supplies enable true rail-to-rail input (–0.25 V to V+ + 0.1 V) and output swing (to within 0.075 V of V+ and 0.25 V of V–).
It integrates auto-correction circuitry operating at 90 kHz ±20% to suppress 1/f noise-especially effective at gains ≥100-while external R2/C2 and RO/CO filters determine bandwidth-noise tradeoffs. Gain is set externally via G = 2(R2/R1), supporting programmable ranges from <0.1 to >10,000 V/V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Offset Voltage (max) | ±100 µV over –40°C to +125°C - ensures ≤0.1% error in 100 mV full-scale bridge outputs without trimming. |
| Offset Drift (max) | ±0.4 µV/°C - enables stable µV-level measurements across automotive under-hood temperature swings. |
| Input Common-Mode Range | (V–) + 0.25 V to (V+) + 0.1 V - supports direct connection to grounded sensors and single-supply operation down to 2.7 V. |
| CMR (min) | 100 dB over temperature - rejects >99.99% of EMI-coupled noise in industrial motor control feedback loops. |
| Gain Bandwidth | 1 kHz at G = 1–1k with 1 kHz filter - matches anti-aliasing requirements for 1 kSPS data acquisition systems. |
| Quiescent Current | 3.4 mA max at +5 V - enables continuous operation in battery-backed medical monitors with 100+ hour runtime. |
| Package | MSOP-8 (DGK) - 3.0 mm × 3.0 mm footprint fits high-density PCB layouts in portable test equipment. |
Pinout & Package
INA337AIDGKR is housed in an 8-pin MSOP (VSSOP-DGK) package per JEDEC MO-187, with 0.65 mm pitch, 3.0 mm × 3.0 mm body, and exposed thermal pad (not electrically connected). Pin 1 is marked with a dot; device orientation follows standard MSOP top-view convention.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VIN–) | Inverting input terminal | Accepts differential input signals; requires DC bias path for ±0.2 nA input bias current. |
| 2 (VIN+) | Non-inverting input terminal | Accepts differential input signals; same bias requirement as Pin 1; matched impedance critical for CMR. |
| 3 (V–) | Negative supply rail | Connects to ground or negative rail; bypass with 0.1 µF capacitor to Pin 7 for stability. |
| 4 (V+) | Positive supply rail | Accepts +2.7 V to +5.5 V; bypass directly to Pin 3 with 0.1 µF capacitor. |
| 5 (IACOMMON) | Output reference node | Defines output voltage reference point; connects to low side of R2; sets common-mode level for A/D converter interface. |
| 6 (VO) | Amplified output | Delivers filtered gain-adjusted signal; drives 10 kΩ load with ≤0.075 V headroom to V+ and ≤0.25 V to V–. |
| 7 (R1) | Gain-setting resistor terminal | Connects external R1 to set first-stage gain; minimum value is 2 kΩ per design equation. |
| 8 (R2) | Gain-setting resistor terminal | Connects external R2 to set second-stage gain; combined with R1 determines total G = 2(R2/R1). |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input range | Operates linearly from (V–) + 0.25 V to (V+) + 0.1 V - eliminates need for level-shifting in single-supply bridge circuits. |
| Auto-correction noise reduction | 90 kHz internal oscillator cancels 1/f noise - achieves 0.8 µVP-P (0.01–10 Hz) at G = 100, enabling µV-resolution thermocouple readings. |
| Current-mode architecture | Rejects common-mode voltage without precision-matched resistors - maintains >100 dB CMR despite PCB trace mismatch or temperature gradients. |
| Wide temperature specification | Guaranteed performance from –40°C to +125°C - qualified for under-hood automotive and industrial motor drive current sensing. |
| Low quiescent power | 3.4 mA max IQ at +5 V - allows integration into always-on condition monitoring nodes powered by energy-harvesting sources. |
Applications
| Bridge-Based Load Cell Interface | High-Accuracy Thermocouple Amplifier |
|---|---|
Use Scenario: Amplifying mV-level outputs from strain-gauge load cells in weigh scales with ±0.01% linearity requirement. IC Role / Device Role / Timing Role: Precision instrumentation amplifier providing fixed-gain (G = 100–1000), low-drift signal conditioning before 24-bit ΣΔ ADC. Use Value: 100 µV max offset and 0.4 µV/°C drift ensure calibration holds over 10-year product life without field recalibration. | Use Scenario: Cold-junction compensated thermocouple measurement in medical sterilization autoclaves (0–135°C range). IC Role / Device Role / Timing Role: Front-end amplifier rejecting millivolt-level thermocouple EMF while suppressing common-mode noise from heater switching transients. Use Value: 100 dB min CMR and rail-to-rail input allow direct connection to grounded thermocouples without isolation transformers. |
| Multi-Channel Industrial Data Acquisition | Automotive Battery Current Monitoring |
Use Scenario: Simultaneous analog front-end for 16-channel DAQ system measuring pressure, flow, and temperature sensors. IC Role / Device Role / Timing Role: Channelized instrumentation amplifier with external gain resistors enabling per-channel calibration and dynamic range optimization. Use Value: MSOP-8 footprint and 3.4 mA IQ support dense channel packing and thermal management in compact rack-mounted modules. | Use Scenario: High-side shunt current sensing in 12 V automotive battery management systems with ±100 A range. IC Role / Device Role / Timing Role: Differential amplifier rejecting common-mode voltage up to 16 V while amplifying 50–100 mV shunt drops. Use Value: Input range extending to V+ + 0.1 V enables direct connection to shunt placed between battery and load, avoiding costly high-voltage op amps. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar instrumentation amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA128UA/2K5 | 50 µV max VOS, 125 dB CMR, 750 µA IQ, SO-8 package | Better DC precision but lower CMR at high frequency; no rail-to-rail input; requires dual supply for full common-mode range | Choose for ultra-low-offset lab-grade measurements where power and supply flexibility are secondary. |
| INA333AIDGKR | 25 µV max VOS, 0.1 µV/°C drift, 1.2 mA IQ, same MSOP-8 package | Lower noise and drift, but lacks auto-correction clock; not rated for >105°C operation | Choose for battery-powered portable instruments needing best-in-class drift performance below 105°C ambient. |
Compared with INA128UA/2K5 and INA333AIDGKR, the INA337AIDGKR offers superior high-temperature operation (up to +125°C), rail-to-rail input capability enabling true single-supply bridge interfaces, and integrated 1/f noise cancellation-making it uniquely suited for automotive and industrial environments where thermal robustness and supply simplicity are critical.
Availability
INA337AIDGKR is available at Aetrix Electronics and suitable for bridge-based load cell interfaces, high-accuracy thermocouple amplifiers, and multi-channel industrial data acquisition systems requiring stable component supply across extended temperature ranges.
Supply support for INA337AIDGKR 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 leadership in precision signal chain components.
The INA337 belongs to TI's high-temperature instrumentation amplifier product line, engineered specifically for ruggedized sensor signal conditioning in automotive, industrial, and aerospace applications where reliability across –40°C to +125°C is mandatory.
FAQ
What is the maximum operating temperature for the INA337AIDGKR?
The INA337AIDGKR is fully specified from –40°C to +125°C and has an absolute maximum junction temperature of +150°C. Its electrical characteristics-including offset voltage, CMR, and gain error-are guaranteed across the full –40°C to +125°C range, making it suitable for under-hood automotive and industrial motor control applications where ambient temperatures exceed 105°C.
Does the INA337AIDGKR require external gain-setting resistors?
Yes, the INA337AIDGKR requires two external precision resistors: R1 connected between Pins 7 and 8, and R2 connected from Pin 8 to IACOMMON (Pin 5). The overall gain is calculated as G = 2(R2/R1). Resistor values must be selected per TI's recommended tables to maintain stability and minimize drift-R1 must be ≥2 kΩ, and optimal values differ between single-supply (+5 V) and dual-supply (±2.5 V) configurations.
How does the INA337AIDGKR achieve rail-to-rail input operation?
The INA337AIDGKR achieves rail-to-rail input using an internal current-mode architecture powered by on-chip charge pumps. These generate internal supply rails beyond the external V+ and V–, allowing the input stage to accept common-mode voltages from (V–) + 0.25 V up to (V+) + 0.1 V. This eliminates the need for external level-shifting circuitry when interfacing with grounded sensors like strain gauges or thermocouples.
Can the INA337AIDGKR be used with a single 3.3 V supply?
Yes, the INA337AIDGKR operates from +2.7 V to +5.5 V, so it is fully compatible with a 3.3 V single supply. At 3.3 V, its input common-mode range extends from 0.55 V to 3.4 V, and output swing reaches within 0.075 V of 3.3 V and 0.25 V above ground. Performance parameters-including offset, drift, and CMR-remain within datasheet limits across the entire supply range.
What is the purpose of the IACOMMON pin (Pin 5) on the INA337AIDGKR?
The IACOMMON pin (Pin 5) on the INA337AIDGKR defines the reference node for the output voltage. It connects to the low-side terminal of the external R2 gain-setting resistor and establishes the common-mode level for the amplified output. This pin enables flexible output referencing-such as setting a 2.5 V pedestal for bipolar signal digitization-and must be properly decoupled when driving high-impedance A/D converter inputs to avoid gain errors.
INA337AIDGKR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- Instrumentation
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- -
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 1 kHz
- Current - Input Bias:
- 200 pA
- Voltage - Input Offset:
- 20 µV
- Current - Supply:
- 2.4mA
- Current - Output / Channel:
- 25 mA
- Voltage - Supply Span (Min):
- 2.7 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
INA337AIDGKR FAQ
1.How can I place an order for INA337AIDGKR through Aetrix?
Please submit a Request for Quotation (RFQ) for INA337AIDGKR 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 INA337AIDGKR reliable?
The price and inventory of INA337AIDGKR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA337AIDGKR is usually 5 days.
3.What payment methods are accepted for INA337AIDGKR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA337AIDGKR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA337AIDGKR?
INA337AIDGKR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA337AIDGKR 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 INA337AIDGKR?
For technical support, including INA337AIDGKR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA337AIDGKR requirements.
6.How does Aetrix verify that INA337AIDGKR is sourced from the original manufacturer or authorized distributors?
All INA337AIDGKR 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 INA337AIDGKR meets industry standards.
7.What is the process for return or replacement of INA337AIDGKR?
All INA337AIDGKR units undergo pre-shipment inspection (PSI). If there is an issue with INA337AIDGKR, 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 INA337AIDGKR part is unused and in its original packaging.
Return procedure for INA337AIDGKR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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