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Texas Instruments INA2126U
- Part No.:
- INA2126U
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
INA2126U.pdf
- Description:
- IC INST AMP 2 CIRCUIT 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:446
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Product details
Overview
INA2126U from Texas Instruments is a dual-channel, micropower instrumentation amplifier in 16-pin SOIC (D) package, delivering 175μA/channel quiescent current, ±1.35V to ±18V dual-supply operation, and 250μV max input offset voltage. It performs precision differential signal acquisition in portable medical sensors and industrial transmitters where low power and high common-mode rejection are critical.
For engineers reviewing the INA2126U datasheet, INA2126U pinout, INA2126U application, or INA2126U equivalent, key selection factors include its two-op-amp architecture enabling low-power operation, gain programmability from 5V/V to 10,000V/V via single external resistor RG, dual-channel channel separation ≥130dB (dc), and guaranteed performance across –40°C to +85°C.
Technical Context
The INA2126U implements a two-op-amp instrumentation amplifier topology-distinct from traditional three-op-amp designs-reducing quiescent current while maintaining high input impedance and balanced input structure. Its internal laser-trimmed 40kΩ/10kΩ resistor network enables precise gain setting with G = 5 + 80kΩ/RG.
Each channel features independent reference (RefA/RefB), sense (SenseA/SenseB), and gain-setting terminals (RGA/RGB), supporting individual gain configuration and remote-sense feedback for load-referred accuracy. Input bias current remains ≤±25nA with drift ≤±30pA/°C, and CMRR reaches 94dB at dc with RS = 0Ω.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Channels | Dual independent amplifiers with separate inputs, outputs, references, and gain paths |
| Supply Range | ±1.35V to ±18V dual supply; supports single-supply operation from 2.7V to 36V with REF pin biasing |
| Quiescent Current | 175μA per channel - enables battery-powered ECG monitors and portable field transmitters |
| Input Offset Voltage | ±250μV maximum - ensures <0.1% gain error at G=100 for 10mV input signals |
| Gain Range | 5V/V to 10,000V/V set by single external resistor RG - eliminates need for multiple op-amps or digital calibration |
| CMRR | 94dB minimum at dc (RS = 0Ω) - rejects >99.998% of 60Hz line noise in patient monitoring systems |
| Bandwidth | 200kHz at G=5 (CSO: SHE) - supports fast-response flow meter signal conditioning up to 10kHz |
Pinout & Package
INA2126U is housed in a 16-pin SOIC (D) package with 1.27mm pitch, 10.3mm × 7.5mm body, and exposed thermal pad not present. Pin functions are validated per TI SBOS062D Rev. December 2025.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | V–INA | Negative input for Channel A - must be driven differentially with V+INA; high-Z node requiring bias path |
| 2 | V+INA | Positive input for Channel A - forms differential pair with Pin 1; matched input impedance preserves CMRR |
| 3, 4 | RGA | Channel A gain-setting node - connect external RG between Pins 3 and 4 to set G = 5 + 80kΩ/RG |
| 5 | RefA | Channel A output reference - low-impedance drive required (≤8Ω) to maintain >80dB CMRR |
| 6 | VOA | Channel A output - connects to SenseA (Pin 7) for remote sensing; swing limited to (V+)–0.75V / (V–)+0.8V |
| 7 | SenseA | Channel A feedback sense - must be connected directly to VOA (Pin 6) unless remote load sensing is used |
| 8 | V– | Negative supply rail - shared by both channels; decoupling capacitor required near pin |
| 9 | V+ | Positive supply rail - shared by both channels; decoupling capacitor required near pin |
| 10 | SenseB | Channel B feedback sense - must be connected directly to VOB (Pin 11) unless remote load sensing is used |
| 11 | VOB | Channel B output - connects to SenseB (Pin 10); identical swing limits as VOA |
| 12 | RefB | Channel B output reference - independently configurable; same low-Z requirement as RefA |
| 13, 14 | RGB | Channel B gain-setting node - connect external RG between Pins 13 and 14; fully independent of RGA |
| 15 | V+INB | Positive input for Channel B - forms differential pair with Pin 16; electrically isolated from Channel A |
| 16 | V–INB | Negative input for Channel B - forms differential pair with Pin 15; no crosstalk coupling below 100kHz |
Key Features
| Feature | Design Value |
|---|---|
| Two-op-amp architecture | Reduces quiescent current by ~40% vs. three-op-amp IAs while preserving high input impedance and CMRR |
| Independent dual-channel design | Zero shared bias circuitry - enables simultaneous measurement of isolated sensor pairs without channel interaction |
| External gain resistor interface | Single RG sets precise gain from 5–10,000V/V; internal 80kΩ ladder eliminates trimming and improves tempco stability |
| Reference pin flexibility | RefA/RefB pins allow level-shifting outputs to match ADC input ranges or eliminate ground loops in mixed-signal systems |
| Remote sense capability | SenseA/SenseB terminals enable Kelvin connection to loads - corrects for IR drop in long traces or PCB copper resistance |
Applications
| Level Transmitter | ECG Signal Conditioning |
|---|---|
|
Use Scenario: Measures 4–20mA loop current from pressure or ultrasonic level sensors in tank farms and chemical plants. IC Role / Device Role / Timing Role: Dual-channel INA2126U acquires differential bridge outputs while rejecting common-mode noise from motor drives and RF interference. Use Value: 175μA/channel quiescent current extends battery life in wireless level nodes; 94dB CMRR suppresses 60Hz pickup in unshielded industrial wiring. |
Use Scenario: Amplifies microvolt-level differential signals from limb leads in portable electrocardiogram (ECG) devices. IC Role / Device Role / Timing Role: Each channel conditions one lead pair (e.g., LA–RA, LL–RA) with independent gain and reference control for baseline adjustment. Use Value: 250μV max offset ensures <10μV baseline drift over temperature; 35nV/√Hz input noise preserves QRS complex fidelity at 100x gain. |
| AC Charging Station Sensor Hub | Multiparameter Patient Monitor |
|
Use Scenario: Interfaces isolation amplifiers and shunt-based current sensors in EV charging pile power electronics modules. IC Role / Device Role / Timing Role: INA2126U buffers and scales isolated analog outputs before digitization, rejecting switching noise from 100kHz PWM inverters. Use Value: 200kHz bandwidth at G=5 captures transient fault currents; dual-channel independence prevents cross-coupling between voltage and current measurement paths. |
Use Scenario: Integrates into modular patient monitor backplanes acquiring SpO₂, NIBP, temperature, and respiration signals simultaneously. IC Role / Device Role / Timing Role: One INA2126U handles analog front-end for two sensor types (e.g., thermistor + pressure transducer), reducing component count and board area. Use Value: SOIC-16 footprint allows dense layout; –40°C to +85°C rating supports sterilization cycles and bedside deployment in varying ambient conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar instrumentation amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA2128U | Higher precision: ±100μV max offset, ±0.5μV/°C drift, but 250μA/channel IQ | Better for lab-grade data loggers; less suitable for battery-powered portable units | Select INA2128U only when offset drift dominates system error budget and power is secondary |
| AD8226ARZ | Single-channel, lower IQ (170μA), wider supply (±2.5V to ±18V), but no sense pins or dual-channel integration | Requires two devices for dual-sensor use; lacks remote sense for load regulation | Choose AD8226ARZ when single-ended output referencing suffices and board space permits discrete duplication |
Compared with INA2126U, INA2128U trades 75μA higher quiescent current for 2.5× lower offset drift, while AD8226ARZ offers comparable power but requires duplication and lacks integrated dual-channel isolation - making INA2126U optimal for space-constrained, battery-operated dual-sensor systems demanding matched channel behavior.
Availability
INA2126U is available at Aetrix Electronics and suitable for level transmitters, ECG signal chains, AC charging station sensor hubs, and multiparameter patient monitors requiring stable component supply across extended production lifecycles.
Supply support for INA2126U 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 components.
The INAx126 product line was engineered for low-power, high-accuracy industrial and medical instrumentation-emphasizing micropower operation, wide supply range, and robust common-mode rejection in compact packages.
FAQ
What is the minimum gain achievable with INA2126U, and how is it configured?
The minimum gain of INA2126U is 5V/V, achieved by leaving the RGA and RGB pins (Pins 3–4 and 13–14) open - no external resistor required. This fixed-gain mode leverages internal 40kΩ/10kΩ resistor ratios and maintains full specifications including CMRR and bandwidth. Gain scaling beyond 5V/V requires a single precision resistor per channel per TI SBOS062D Section 7.2.2.1.
Does INA2126U support single-supply operation, and what are the REF pin requirements?
Yes, INA2126U supports single-supply operation from 2.7V to 36V. The REF pins (5 and 12) must be driven by a low-impedance source - ideally a voltage divider or buffer referenced to mid-supply - to prevent CMRR degradation. A series resistance >8Ω on RefA or RefB reduces CMRR to ~80dB; TI recommends using OPAx37 or similar rail-to-rail buffers for critical applications.
How does the SenseA and SenseB functionality improve accuracy in INA2126U?
SenseA (Pin 7) and SenseB (Pin 10) provide Kelvin feedback paths that sense voltage directly at the load, compensating for IR drop across PCB traces or connectors. When connected to VOA (Pin 6) and VOB (Pin 11), they enable standard operation; when routed to the load, they correct for up to ±50mV of series resistance error - critical for precision current sensing in AC charging stations.
What is the maximum allowable input common-mode voltage for INA2126U at ±15V supplies?
At ±15V supplies, the input common-mode voltage range for INA2126U is –11.25V to +11.25V per Figure 5-6 in SBOS062D. Exceeding this range saturates internal op-amp A2, causing invalid output regardless of differential input. The limit is supply-dependent: at ±18V, it extends to ±13.5V; at ±1.35V, it contracts to ±1.01V.
Can INA2126U replace INA2126P in existing PDIP-based designs without layout changes?
No - INA2126U (SOIC-16) and INA2126P (PDIP-16) share identical pinout and electrical specifications but differ in package dimensions, thermal characteristics, and soldering profiles. SOIC requires reflow-compatible pads and 1.27mm pitch routing; PDIP uses through-hole mounting with 2.54mm spacing. Direct replacement requires PCB redesign and validation of thermal performance (RθJA = 76.2°C/W vs. 39.3°C/W).
INA2126U Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- Instrumentation
- Number of Circuits:
- 2
- Output Type:
- -
- Slew Rate:
- 0.4V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 200 kHz
- Current - Input Bias:
- 10 nA
- Voltage - Input Offset:
- 100 µV
- Current - Supply:
- 175µA (x2 Channels)
- Current - Output / Channel:
- 10 mA
- Voltage - Supply Span (Min):
- 2.7 V
- Voltage - Supply Span (Max):
- 36 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
INA2126U FAQ
1.How can I place an order for INA2126U through Aetrix?
Please submit a Request for Quotation (RFQ) for INA2126U 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 INA2126U reliable?
The price and inventory of INA2126U are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA2126U is usually 5 days.
3.What payment methods are accepted for INA2126U?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA2126U transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA2126U?
INA2126U orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA2126U 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 INA2126U?
For technical support, including INA2126U datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA2126U requirements.
6.How does Aetrix verify that INA2126U is sourced from the original manufacturer or authorized distributors?
All INA2126U 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 INA2126U meets industry standards.
7.What is the process for return or replacement of INA2126U?
All INA2126U units undergo pre-shipment inspection (PSI). If there is an issue with INA2126U, 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 INA2126U part is unused and in its original packaging.
Return procedure for INA2126U:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
INA2126U Tags
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LM358DR
Texas Instruments
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MCP6006UT-E/OT
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LM358P
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