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Texas Instruments INA350CDSIRUGR
- Part No.:
- INA350CDSIRUGR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 10-XFQFN
- Datasheet:
-
INA350CDSIRUGR.pdf
- Description:
- LOW-POWER (100 UA) SELECTABLE-GA
- Quantity:
- Payment:
- Shipping:
Inventory:2,674
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Product details
Overview
INA350CDSIRUGR from Texas Instruments is a selectable-gain instrumentation amplifier optimized for bridge sensing and differential-to-single-ended conversion in space- and power-constrained systems. It delivers G = 30 or G = 50 gain options, 95 dB typical CMRR, 0.2 mV typical offset voltage, 100 µA typical quiescent current, and operates from 1.8 V to 5.5 V supply - enabling use in wearable fitness monitors and low-power analog input modules.
For engineers reviewing the INA350CDSIRUGR datasheet, INA350CDSIRUGR pinout, INA350CDSIRUGR application, or INA350CDSIRUGR equivalent, this page provides verified package mapping (10-pin X2QFN, 1.5 mm × 2.0 mm), gain-select logic thresholds, shutdown timing (tON = 100 µs), load drive capability (500 pF, <20% overshoot), and validated alternative part comparisons for precision sensor signal conditioning.
Technical Context
The INA350CDSIRUGR uses a three-amplifier architecture with integrated precision-matched thin-film resistors to eliminate external gain-setting components. Its gain-select (GS) pin toggles between G = 30 (logic low) and G = 50 (logic high), with no-connect defaulting to G = 50 - enabling flexible configuration without resistor changes.
It features rail-to-rail output swing with 15 mV headroom, 100 kHz bandwidth at G = 10 (scaling inversely with gain), and robust EMI rejection (96 dB at 1 GHz). The reference input (REF) accepts low-impedance sources and provides unity-gain buffering to the output stage, supporting precise level-shifting in single-supply ADC interfacing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Options | G = 30 (GS = logic low) or G = 50 (GS = logic high); no external resistors required |
| CMRR | 95 dB typical across all gains - ensures stable output under common-mode noise in bridge sensors |
| Input Offset Voltage | ±0.2 mV typical (RTI) - enables accurate DC-coupled measurement in weigh scales and pressure sensors |
| Quiescent Current | 100 µA typical - supports multi-year battery life in wearable glucose monitors |
| Bandwidth | 25 kHz at G = 50 - sufficient for sub-10 kHz sensor signals including flow transmitters and temperature sensing |
| Supply Range | 1.8 V to 5.5 V single-supply or ±0.9 V to ±2.75 V dual-supply - compatible with Li-ion, coin-cell, and industrial rails |
| Operating Temperature | –40°C to +125°C - qualified for automotive cabin and industrial embedded environments |
Pinout & Package
INA350CDSIRUGR is housed in a 10-pin X2QFN (RUG) package measuring 1.5 mm × 2.0 mm with exposed thermal pad connected to V−. Pin 5 and Pin 10 are no-connect (NC).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - GS | Gain select digital input | Logic low → G = 30; logic high → G = 50; NC → G = 50 - enables firmware-configurable gain without BOM change |
| 2 - IN− | Negative input | Inverting input of first-stage amplifier; matched impedance with IN+ for optimal CMRR |
| 3 - IN+ | Positive input | Non-inverting input of first-stage amplifier; high-Z (100 GΩ || 9 pF) for minimal loading on bridge networks |
| 4 - V− | Negative supply | Reference for internal biasing; thermal pad must be soldered to PCB ground plane for thermal performance |
| 6 - REF | Reference input | Low-impedance buffered node; drives output offset; requires ≤60 kΩ source impedance for accuracy |
| 7 - OUT | Analog output | Rail-to-rail output capable of driving 10 kΩ loads and 500 pF capacitive loads with <20% overshoot |
| 8 - V+ | Positive supply | Primary power rail; supplies all internal amplifiers and bias circuits |
| 9 - SHDN | Shutdown control input | Logic high → enabled; logic low → 0.7 µA shutdown current; tOFF = 4 µs, tON = 100 µs |
Key Features
| Feature | Design Value |
|---|---|
| Integrated precision gain resistors | Eliminates need for external 0.1% matched resistors - reduces BOM count, layout area, and assembly cost |
| Selectable gain via digital pin | Single GS pin selects between G = 30 and G = 50 - avoids re-spinning PCB for gain optimization |
| Ultra-low quiescent current | 100 µA typical - enables always-on sensing in battery-powered wearables without compromising resolution |
| EMI rejection | 96 dB at 1 GHz - maintains signal integrity in noisy environments like motor-driven medical devices |
| Small footprint | 3 mm² X2QFN package - fits within tight spaces in compact analog front-ends for portable diagnostics |
Applications
| Bridge Network Sensing | Differential to Single-Ended Conversion |
|---|---|
Use Scenario: Strain gauge or load cell outputs small differential voltages (<10 mV) requiring amplification before ADC sampling. IC Role / Device Role / Timing Role: Instrumentation amplifier providing precise, low-noise gain with high CMRR to reject common-mode noise from long sensor traces. Use Value: Integrated 145 kΩ gain-setting resistors ensure ±0.082% gain error at G = 50 - eliminating calibration drift from external resistor tolerances. |
Use Scenario: Converting differential outputs from isolated amplifiers or isolation transformers into single-ended signals compatible with SAR ADCs. IC Role / Device Role / Timing Role: Precision gain block with REF pin allowing output level-shift to match ADC input range (e.g., 0–3.3 V). Use Value: 95 dB CMRR and 36 nV/√Hz input noise preserve SNR when interfacing with 12-bit to 14-bit converters in analog input modules. |
| Weigh Scale Systems | Wearable Fitness Monitors |
Use Scenario: Multi-range weighing platforms requiring programmable gain to handle full-scale loads from grams to kilograms. IC Role / Device Role / Timing Role: Selectable-gain front-end amplifier enabling one hardware design to support multiple product SKUs via firmware-controlled GS pin. Use Value: G = 30/G = 50 options allow dynamic range optimization - e.g., G = 30 for high-accuracy low-load mode, G = 50 for fast-response overload detection. |
Use Scenario: Continuous heart rate or motion sensing using photodiode or accelerometer bridges powered by coin-cell batteries. IC Role / Device Role / Timing Role: Low-power instrumentation amplifier with shutdown mode reducing system idle current to sub-µA levels. Use Value: 100 µA operating current and 0.7 µA shutdown current extend battery life beyond 12 months in always-on monitoring applications. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar instrumentation amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA350CDSIDSGR | Same gain options (G = 30/50), identical electrical specs, but in 8-pin WSON (2.0 mm × 2.0 mm) package | Higher thermal resistance (RθJA = 89.2°C/W vs 199.0°C/W) - better suited for moderate-power, non-thermally constrained layouts | Choose for simplified 2-layer PCB routing where 10-pin RUG layout complexity is undesirable |
| INA333AIDRGT | Fixed G = 1000, 50 µA IQ, 0.25 µV/°C drift, but no gain-select pin or shutdown function | Lacks digital configurability - requires separate enable circuitry and fixed gain limits dynamic range flexibility | Prefer only when ultra-low drift and fixed high gain outweigh need for programmability and power gating |
Compared with INA350CDSIDSGR, the INA350CDSIRUGR offers 33% smaller footprint (3 mm² vs 4 mm²) and lower thermal resistance to board (123.2°C/W), while maintaining identical gain selection, shutdown behavior, and precision specs - making it optimal for ultra-compact, thermally sensitive designs.
Availability
INA350CDSIRUGR is available at Aetrix Electronics and suitable for bridge network sensing, wearable fitness monitors, and analog input modules requiring stable component supply, consistent parametric performance across production lots, and long-term manufacturability assurance.
Supply support for INA350CDSIRUGR 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 precision signal chain solutions.
The INA350 product line was designed specifically for cost-sensitive, size-constrained industrial and portable sensor applications - delivering instrumentation-grade performance without external precision resistors or complex layout requirements.
FAQ
What gain options does the INA350CDSIRUGR support, and how are they selected?
The INA350CDSIRUGR supports two gain options: G = 30 and G = 50. These are selected via the GS pin: logic low (≤0.2 V above V−) sets G = 30, logic high (≥1 V above V−) sets G = 50, and no connection defaults to G = 50. This eliminates external resistors and allows firmware-based gain switching. All gain configurations maintain 95 dB typical CMRR and ±0.082% max gain error at G = 50.
Does the INA350CDSIRUGR require external resistors for gain setting?
No, the INA350CDSIRUGR does not require external resistors for gain setting. It integrates precision-matched thin-film resistors internally - 145 kΩ for the INA350CDS variant - enabling G = 30 and G = 50 operation directly from the GS pin state. This reduces BOM count, saves PCB area, and improves long-term gain stability versus discrete resistor networks.
What is the shutdown current and enable timing of the INA350CDSIRUGR?
The INA350CDSIRUGR draws 0.70 µA typical quiescent current in shutdown mode (SHDN = V−), with a maximum of 1.25 µA over temperature. Amplifier enable time (tON) is 100 µs, and disable time (tOFF) is 4 µs - measured from 50% SHDN transition to 90% or 10% of final output voltage. This supports rapid wake/sleep cycling in battery-powered sensor nodes.
Can the INA350CDSIRUGR drive a 500-pF capacitive load without instability?
Yes, the INA350CDSIRUGR is specified to drive up to 500 pF with less than 20% overshoot under small-signal conditions (100 mV step), per the datasheet's CL Drive specification. This capability simplifies anti-aliasing filter design and allows direct connection to ADC input capacitors or long PCB traces without external isolation resistors.
What is the operating temperature range and supply voltage range for the INA350CDSIRUGR?
The INA350CDSIRUGR is fully specified from –40°C to +125°C ambient temperature and operates from a single supply of 1.8 V to 5.5 V (or dual supply ±0.9 V to ±2.75 V). Its 100 µA typical quiescent current remains stable across this range, and key parameters - including offset voltage, CMRR, and gain error - are characterized across the full temperature span.
INA350CDSIRUGR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 10-XFQFN
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- -
- Number of Circuits:
- 1
- Output Type:
- Single-Ended
- Slew Rate:
- 0.24V/µs
- Gain Bandwidth Product:
- 100 kHz
- -3db Bandwidth:
- 25 kHz
- Current - Input Bias:
- 0.65 pA
- Voltage - Input Offset:
- 200 µV
- Current - Supply:
- 100µA
- Current - Output / Channel:
- 20 mA
- Voltage - Supply Span (Min):
- 1.8 V
- Voltage - Supply Span (Max):
- 5.5 V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-X2QFN (2x1.5)
INA350CDSIRUGR FAQ
1.How can I place an order for INA350CDSIRUGR through Aetrix?
Please submit a Request for Quotation (RFQ) for INA350CDSIRUGR 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 INA350CDSIRUGR reliable?
The price and inventory of INA350CDSIRUGR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA350CDSIRUGR is usually 5 days.
3.What payment methods are accepted for INA350CDSIRUGR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA350CDSIRUGR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA350CDSIRUGR?
INA350CDSIRUGR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA350CDSIRUGR 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 INA350CDSIRUGR?
For technical support, including INA350CDSIRUGR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA350CDSIRUGR requirements.
6.How does Aetrix verify that INA350CDSIRUGR is sourced from the original manufacturer or authorized distributors?
All INA350CDSIRUGR 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 INA350CDSIRUGR meets industry standards.
7.What is the process for return or replacement of INA350CDSIRUGR?
All INA350CDSIRUGR units undergo pre-shipment inspection (PSI). If there is an issue with INA350CDSIRUGR, 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 INA350CDSIRUGR part is unused and in its original packaging.
Return procedure for INA350CDSIRUGR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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