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Texas Instruments INA351CDSIRUGR
- Part No.:
- INA351CDSIRUGR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 10-XFQFN
- Datasheet:
-
INA351CDSIRUGR.pdf
- Description:
- TINY (1.5-MM - 2-MM) LOW-POWER
- Quantity:
- Payment:
- Shipping:
Inventory:4,586
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Product details
Overview
INA351CDSIRUGR from Texas Instruments is a selectable-gain instrumentation amplifier with integrated reference buffer, designed for bridge sensing and differential-to-single-ended conversion. It offers G = 30 or G = 50 gain options via the GS pin, 95 dB typical CMRR, 0.2 mV typical offset voltage, and 110 µA typical quiescent current across –40°C to 125°C. It targets low-power, space-constrained analog front-ends in wearable health monitors and industrial sensor modules.
For engineers reviewing the INA351CDSIRUGR datasheet, INA351CDSIRUGR pinout, INA351CDSIRUGR application, or INA351CDSIRUGR equivalent, key selection criteria include gain select logic compatibility, RUG package thermal performance (174.7°C/W θJA), shutdown timing (100 µs enable), and integrated reference buffer drive capability for ADC interfacing.
Technical Context
The INA351CDSIRUGR implements a three-amplifier instrumentation architecture with precision-matched on-die resistors to eliminate external gain-setting components. Its gain-select pin (GS) toggles between 30× (logic low) and 50× (logic high), with no-connect defaulting to 50× - enabling flexible system-level gain configuration without hardware changes.
It integrates a unity-gain reference buffer (REF pin) with 100 GΩ || 5 pF input impedance and ±0.015% reference gain error, allowing direct connection to mid-supply or external references for single-ended ADC interfacing. The device operates from 1.8 V to 5.5 V single supply or ±0.9 V to ±2.75 V dual supply, supporting rail-to-rail output swing with 15 mV headroom.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Options | G = 30 (GS = low) or G = 50 (GS = high); no-connect defaults to G = 50 - enables firmware-controlled gain switching without PCB modification |
| CMRR | 95 dB typical at 25°C; maintains ≥86 dB min across –40°C to 125°C - ensures stable rejection of common-mode noise in noisy industrial environments |
| Offset Voltage | ±0.2 mV typical (RTI), ±1.4 mV max over temperature - supports 12-bit accuracy without calibration in weigh scale and pressure sensing |
| Quiescent Current | 110 µA typical, 147 µA max over temperature - enables multi-year battery life in wearable fitness monitors |
| Bandwidth | 25 kHz at G = 50 (–3 dB); 40 kHz at G = 30 - sufficient for DC–10 kHz sensor signals including ECG and strain gauge outputs |
| Shutdown Current | 0.85 µA typical (SHDN = low) - reduces power to negligible levels during idle periods in intermittent-sampling systems |
| Input Impedance | 100 GΩ || 9 pF common-mode, 100 GΩ || 5 pF differential - minimizes loading on high-impedance bridge sensors and thermocouples |
Pinout & Package
The INA351CDSIRUGR is housed in a 10-pin X2QFN (RUG) package measuring 1.5 mm × 2.0 mm (3 mm²), with exposed thermal pad connected to V– for enhanced thermal dissipation (θJC(bot) = n/a, θJB = 99.6°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - GS | Gain Select digital input | Logic low selects G = 30; logic high selects G = 50; open defaults to G = 50 - allows flexible gain configuration without pull-up/down resistors |
| 2 - IN– | Inverting input | Negative input of first-stage differential pair - connects directly to one side of Wheatstone bridge or transducer |
| 3 - IN+ | Noninverting input | Positive input of first-stage differential pair - connects to opposite bridge leg; matched input impedance minimizes CMRR degradation |
| 4 - V– | Negative supply | Ground reference for single-supply operation or negative rail in dual-supply mode; thermal pad must be soldered to PCB ground plane |
| 5 - NC | No connect | Unbonded pin; must remain unconnected per TI design - no routing or stitching required |
| 6 - REF | Reference buffer input | Internally buffered unity-gain follower input - accepts mid-supply or external reference to set output common-mode level for ADC interface |
| 7 - OUT | Analog output | Single-ended amplified output referenced to REF; drives 500 pF load with <20% overshoot - compatible with SAR and sigma-delta ADC inputs |
| 8 - V+ | Positive supply | Power rail input; supports 1.8–5.5 V single supply or ±0.9–±2.75 V dual supply - enables direct Li-ion or coin-cell operation |
| 9 - SHDN | Shutdown control input | Active-low enable; logic low disables all amplifiers, reducing IQ to <1.5 µA - critical for ultra-low-power wake-on-event architectures |
| 10 - NC | No connect | Unbonded pin; must remain unconnected - no thermal or electrical function |
Key Features
| Feature | Design Value |
|---|---|
| Integrated gain-setting resistors | Eliminates need for external precision resistors, reducing BOM count, layout area, and matching-induced errors in production |
| Selectable gain via digital pin | GS pin enables runtime gain reconfiguration (30×/50×) without changing hardware - supports multi-range sensor calibration in firmware |
| Integrated reference buffer | Unity-gain REF buffer provides stable, low-impedance reference point for ADC interfacing - avoids external op-amp and resistor network |
| Ultra-low quiescent current | 110 µA typical IQ enables continuous monitoring in battery-powered devices such as glucose meters and activity trackers |
| Small 3 mm² X2QFN package | RUG package saves board space in wearables and portable medical devices where volume and weight are constrained |
Applications
| Bridge Network Sensing | Differential to Single-Ended Conversion |
|---|---|
Use Scenario: Measuring microvolt-level output from a full-bridge pressure sensor in an industrial flow transmitter. IC Role / Device Role / Timing Role: Instrumentation amplifier providing precise, low-noise gain and common-mode rejection before ADC sampling. Use Value: 95 dB CMRR and 0.2 mV offset ensure <0.1% measurement error over temperature without trimming - reducing calibration cost and complexity. | Use Scenario: Converting differential output from a thermocouple amplifier to single-ended signal compatible with 12-bit SAR ADC. IC Role / Device Role / Timing Role: Precision gain stage with integrated REF buffer establishing stable common-mode voltage for ADC input range. Use Value: Integrated reference buffer eliminates external op-amp, saving 2 mm² PCB area and improving PSRR by 75 µV/V at 1 kHz. |
| Weigh Scale | Wearable Fitness Monitor |
Use Scenario: Amplifying mV-level output from load cell in consumer-grade bathroom scale with battery operation. IC Role / Device Role / Timing Role: Low-power instrumentation amplifier with shutdown mode activated between weigh cycles. Use Value: 0.85 µA shutdown current extends 2x AAA battery life to >3 years with daily use - meeting UL energy efficiency requirements. | Use Scenario: Conditioning ECG electrode signals in compact chest-worn heart rate monitor powered by CR2032 coin cell. IC Role / Device Role / Timing Role: Front-end amplifier with G = 50 for high sensitivity, operating from 3.3 V supply with minimal self-heating. Use Value: 3 mm² RUG package fits within 8 mm × 8 mm module footprint; 110 µA IQ enables >7-day continuous operation per charge. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar instrumentation amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA350CDSIRUGR | Same RUG package and pinout; G = 30/50; but lacks integrated reference buffer - requires external REF circuitry | Suitable only when external reference generation is already present; not drop-in for REF-dependent designs | Select if REF functionality is unnecessary and BOM cost reduction is prioritized over design simplicity |
| AD8420ARMZ | 8-pin MSOP; G = 10/100/1000 via resistor network; no digital gain select; 1.5 mA IQ - 13.6× higher quiescent current than INA351CDSIRUGR | Better for high-speed (>100 kHz) or high-precision (>100 dB CMRR) applications, not ultra-low-power or space-constrained use cases | Choose when bandwidth >100 kHz or CMRR >100 dB is required, and board area and battery life are secondary concerns |
Compared with INA350CDSIRUGR, the INA351CDSIRUGR adds integrated REF buffering for simplified ADC interfacing; compared with AD8420ARMZ, it delivers 13.6× lower quiescent current and 3 mm² smaller footprint - making it optimal for battery-powered, miniaturized sensor nodes.
Availability
INA351CDSIRUGR is available at Aetrix Electronics and suitable for bridge sensing, wearable health monitoring, and industrial analog input modules requiring stable component supply, long-term lifecycle support, and guaranteed traceability.
Supply support for INA351CDSIRUGR 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 company specializing in analog and embedded processing technologies, with leadership in precision signal chain solutions.
The INA351 product line delivers cost- and size-optimized instrumentation amplifiers for 10-bit to 14-bit data acquisition systems, targeting battery-powered and space-constrained sensor interfaces in medical, industrial, and consumer applications.
FAQ
What gain options does the INA351CDSIRUGR support, and how are they selected?
The INA351CDSIRUGR supports two fixed gain options: G = 30 and G = 50. These are selected using the GS pin: logic low (≤0.2 V relative to V–) configures G = 30, logic high (≥1.0 V relative to V–) configures G = 50, and leaving GS unconnected defaults to G = 50. This digital selection eliminates external resistors and enables firmware-controlled gain switching in the INA351CDSIRUGR without hardware changes.
Does the INA351CDSIRUGR require external resistors for gain setting?
No, the INA351CDSIRUGR does not require external resistors for gain setting. It uses precision-matched on-die thin-film resistors to implement its G = 30 and G = 50 options. This internal resistor network eliminates BOM components, reduces PCB area, avoids resistor matching tolerances, and improves long-term stability - all confirmed in the INA351CDSIRUGR datasheet Section 3 and Table 6-5.
What is the function of the REF pin on the INA351CDSIRUGR?
The REF pin on the INA351CDSIRUGR connects to an integrated unity-gain reference buffer amplifier. It accepts an external voltage or mid-supply reference and establishes the output common-mode level. This eliminates the need for an external op-amp and resistor divider when interfacing with single-ended ADCs. The REF buffer has ±0.015% gain error and 100 GΩ || 5 pF input impedance - specifications verified in INA351CDSIRUGR Electrical Characteristics Table 6-5.
Can the INA351CDSIRUGR operate from a single 1.8 V supply?
Yes, the INA351CDSIRUGR is fully specified for single-supply operation from 1.8 V to 5.5 V. At 1.8 V, it maintains functional performance including 95 dB CMRR (typical), 0.2 mV offset (typical), and 25 kHz bandwidth at G = 50. Quiescent current remains at 110 µA typical, and output swing achieves 15 mV headroom from each rail - all confirmed in INA351CDSIRUGR Recommended Operating Conditions (Section 6.3) and Electrical Characteristics (Section 6.5).
How does the shutdown feature work on the INA351CDSIRUGR?
The INA351CDSIRUGR shutdown feature is controlled by the SHDN pin: applying logic low (≤0.2 V relative to V–) disables all internal amplifiers, reducing quiescent current to 0.85 µA typical. Enable time (tON) is 100 µs; disable time (tOFF) is 5 µs. SHDN is active-low and internally pulled up, so leaving it unconnected keeps the device enabled - behavior documented in INA351CDSIRUGR Pin Functions (Table 5-2) and Electrical Characteristics (Section 6.5).
INA351CDSIRUGR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 10-XFQFN
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- Instrumentation
- Number of Circuits:
- 1
- Output Type:
- Single-Ended
- Slew Rate:
- 0.2V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 25 kHz
- Current - Input Bias:
- 0.65 pA
- Voltage - Input Offset:
- 200 µV
- Current - Supply:
- 110µA
- 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
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-X2QFN (2x1.5)
INA351CDSIRUGR FAQ
1.How can I place an order for INA351CDSIRUGR through Aetrix?
Please submit a Request for Quotation (RFQ) for INA351CDSIRUGR 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 INA351CDSIRUGR reliable?
The price and inventory of INA351CDSIRUGR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA351CDSIRUGR is usually 5 days.
3.What payment methods are accepted for INA351CDSIRUGR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA351CDSIRUGR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA351CDSIRUGR?
INA351CDSIRUGR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA351CDSIRUGR 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 INA351CDSIRUGR?
For technical support, including INA351CDSIRUGR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA351CDSIRUGR requirements.
6.How does Aetrix verify that INA351CDSIRUGR is sourced from the original manufacturer or authorized distributors?
All INA351CDSIRUGR 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 INA351CDSIRUGR meets industry standards.
7.What is the process for return or replacement of INA351CDSIRUGR?
All INA351CDSIRUGR units undergo pre-shipment inspection (PSI). If there is an issue with INA351CDSIRUGR, 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 INA351CDSIRUGR part is unused and in its original packaging.
Return procedure for INA351CDSIRUGR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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