My Inquiry
My Account
Texas Instruments INA2126UA
- Part No.:
- INA2126UA
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
INA2126UA.pdf
- Description:
- IC INST AMP 2 CIRCUIT 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,617
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
INA2126UA from Texas Instruments is a dual-channel, micropower instrumentation amplifier designed for precision differential signal acquisition in low-power industrial and medical systems. It delivers 175μA/channel quiescent current, ±1.35V to ±18V dual-supply operation, 250μV max input offset voltage, 3μV/°C max offset drift, and 35 nV/√Hz input voltage noise - enabling high-accuracy sensor interfacing in battery-powered ECG monitors and flow transmitters.
For engineers reviewing the INA2126UA datasheet, INA2126UA pinout, INA2126UA application, or INA2126UA equivalent, key selection considerations include dual-channel gain-setting flexibility (G = 5 + 80kΩ/RG), independent SenseA/SenseB feedback paths for load-referred accuracy, channel separation >130 dB at DC, and SOIC-16 package compatibility with space-constrained PCB layouts.
Technical Context
The INA2126UA implements a two-op-amp topology that reduces power versus traditional three-op-amp instrumentation amplifiers while maintaining high input impedance (>1 GΩ) and balanced input structure. Its internal laser-trimmed 40kΩ/10kΩ resistor network enables precise gain setting via external RG, with gain error as low as ±0.02% at G = 5.
Each channel features dedicated Ref and Sense pins: Ref sets output common-mode level (must be driven low-impedance), while SenseA/SenseB provide Kelvin sensing at VOA/VOB for improved load regulation. The device operates across –40°C to +85°C and supports single-supply (2.7V–36V) or dual-supply (±1.35V–±18V) configurations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Channels | Dual independent amplifiers with separate gain, reference, and sense paths |
| Supply Range | ±1.35V to ±18V dual or 2.7V–36V single - supports rail-to-rail input common-mode range down to (V–) + 0.5V |
| Quiescent Current | 175μA per channel - enables multi-day battery life in portable patient monitors |
| 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 via single external RG - eliminates need for multiple fixed-gain ICs |
| CMRR | 94dB minimum at G=5, VCM=±11.25V - rejects 60Hz interference in AC-coupled industrial sensors |
| Bandwidth | 200kHz at G=5 (SHE chip site) - sufficient for ECG waveform capture up to 150Hz with margin |
Pinout & Package
INA2126UA is housed in a 16-pin SOIC (D) package with 1.27mm pitch, 10.3mm × 7.5mm body size, and exposed 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 - requires matched bias return path for optimal CMRR |
| 2 | V+INA | Positive input for Channel A - differential pair with Pin 1 forms high-Z sensor interface |
| 3,4 | RGA | Channel A gain-setting node - connect external RG between Pins 3 and 4 for G > 5 |
| 5 | RefA | Channel A output reference - must be driven ≤8Ω impedance to maintain >80dB CMRR |
| 6 | VOA | Channel A output - routed to SenseA (Pin 7) for load-regulated feedback |
| 7 | SenseA | Channel A output sense - connects directly to VOA to compensate for PCB trace IR drop |
| 8 | V– | Negative supply rail - decouple with 0.1μF ceramic capacitor near pin |
| 9 | V+ | Positive supply rail - decouple with 0.1μF ceramic capacitor near pin |
| 10 | SenseB | Channel B output sense - connects directly to VOB (Pin 11) for independent load regulation |
| 11 | VOB | Channel B output - provides second isolated analog channel without cross-talk penalty |
| 12 | RefB | Channel B output reference - independently configurable from RefA for multi-level signal conditioning |
| 13,14 | RGB | Channel B gain-setting node - independent RG allows different gains per channel |
| 15 | V+INB | Positive input for Channel B - electrically isolated from Channel A inputs |
| 16 | V–INB | Negative input for Channel B - enables simultaneous dual-sensor acquisition on one IC |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent instrumentation amps | Eliminates inter-channel crosstalk (<130 dB at DC) and enables mixed-signal acquisition (e.g., ECG + respiration) |
| Two-op-amp architecture | Reduces quiescent current by ~30% vs. three-op-amp IAs while preserving 94dB CMRR at G=5 |
| Separate Sense and Ref pins per channel | Enables true Kelvin sensing at load for <0.01% gain error under varying cable resistance |
| Laser-trimmed internal resistors | Guarantees ±0.02% gain error at G=5 without external calibration |
| Wide supply range support | Operates from ±1.35V (low-voltage battery systems) to ±18V (industrial 24V rails) without performance degradation |
Applications
| ECG Monitoring System | Industrial Flow Transmitter |
|---|---|
Use Scenario: Amplifying microvolt-level differential signals from Ag/AgCl electrodes while rejecting 60Hz mains interference. IC Role / Device Role / Timing Role: Dual-channel IA acquiring lead-I and lead-II ECG waveforms simultaneously with independent gain and reference control. Use Value: 94dB CMRR at G=5 suppresses common-mode noise; 175μA/channel current extends wearable monitor battery life beyond 72 hours. |
Use Scenario: Converting millivolt outputs from electromagnetic flow sensors into calibrated 4–20mA loop signals. IC Role / Device Role / Timing Role: Precision front-end amplifier conditioning sensor bridge outputs with programmable gain (G=100–500) and stable offset. Use Value: ±250μV max offset ensures <0.5% full-scale error at 100mV input; dual channels support redundant sensor validation. |
| Multiparameter Patient Monitor | AC Charging Station Sensor Interface |
Use Scenario: Integrating ECG, temperature, and SpO₂ analog front-ends onto a single PCB with minimal board area. IC Role / Device Role / Timing Role: Dual IA providing isolated signal paths for biopotential and thermistor measurements with shared supply rails. Use Value: SOIC-16 footprint replaces two discrete single-channel IAs, reducing component count by 30% and layout complexity. |
Use Scenario: Measuring isolation resistance and leakage current in EV charging infrastructure per IEC 61851-1 Annex A. IC Role / Device Role / Timing Role: High-common-mode-rejection amplifier acquiring differential voltages across high-value sense resistors under noisy 400V DC bus conditions. Use Value: ±18V supply rating and 11.25V input common-mode range enable direct connection to 400V bus dividers without level-shifting. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar instrumentation amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD8422ARZ | Single-channel, 3-op-amp architecture; 350μA/channel IQ; 10MHz GBW vs. INA2126UA's 200kHz at G=5 | Better bandwidth for high-speed strain gauge readout; lacks dual-channel integration | Select when single-channel speed >200kHz is required and board space permits separate ICs per channel |
| INA2128UA | Dual-channel like INA2126UA but with 3-op-amp design; 500μA/channel IQ; 100dB min CMRR at G=100 | Higher precision offset (±50μV) and CMRR for lab-grade instrumentation; higher power cost | Select when ultra-low offset and CMRR outweigh battery-life constraints in benchtop equipment |
Compared with AD8422ARZ and INA2128UA, the INA2126UA uniquely balances dual-channel integration, micropower operation (175μA/ch), and SOIC-16 footprint - making it optimal for space- and energy-constrained portable medical and industrial sensor nodes where moderate bandwidth suffices.
Availability
INA2126UA is available at Aetrix Electronics and suitable for ECG monitoring systems, industrial flow transmitters, multiparameter patient monitors, and EV charging station safety diagnostics requiring stable component supply across extended production lifecycles.
Supply support for INA2126UA 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 over 50 years of precision amplifier innovation.
The INA2126UA belongs to TI's INAx126 micropower instrumentation amplifier family, engineered specifically for low-power, high-accuracy sensor signal conditioning in portable medical devices and industrial process control systems.
FAQ
What is the maximum gain achievable with the INA2126UA?
The INA2126UA supports gains from 5V/V to 10,000V/V using an external resistor RG connected between Pins 3–4 (Channel A) or 13–14 (Channel B), per the equation G = 5 + 80kΩ/RG. At G = 10,000, RG = 8.0Ω (7.87Ω standard value), requiring careful layout to minimize parasitic resistance. The INA2126UA maintains specified performance across this full range when operated within recommended supply and temperature conditions.
How does the SenseA and SenseB functionality improve measurement accuracy in the INA2126UA?
The SenseA (Pin 7) and SenseB (Pin 10) terminals in the INA2126UA provide Kelvin feedback connections directly to VOA (Pin 6) and VOB (Pin 11), respectively. This configuration compensates for voltage drops across PCB traces or connectors between the amplifier output and the load, ensuring the output stage regulates based on actual load voltage rather than pin voltage. As a result, the INA2126UA achieves <0.01% gain error under varying cable resistance - critical for precision current-sense and sensor calibration applications.
Can the INA2126UA operate from a single 5V supply?
Yes, the INA2126UA supports single-supply operation from 2.7V to 36V. When using a 5V supply, the RefA (Pin 5) and RefB (Pin 12) pins must be biased to a stable mid-supply voltage (e.g., 2.5V) using a low-impedance source to keep both amplifiers within their linear output swing range. Input common-mode voltage must remain between (V–) + 0.5V and (V+) – 0.5V - so with V– = 0V and V+ = 5V, valid VCM is 0.5V–4.5V. The INA2126UA's specifications are guaranteed across this condition per Section 5.3 of the datasheet.
What is the purpose of the RGA and RGB pins on the INA2126UA?
Pins 3–4 (RGA) and 13–14 (RGB) on the INA2126UA serve as dedicated gain-setting nodes for Channel A and Channel B, respectively. Connecting an external resistor RG between these pin pairs configures gain per the formula G = 5 + 80kΩ/RG. This architecture allows independent gain programming for each channel - for example, G = 100 on Channel A for ECG amplification and G = 5 on Channel B for temperature sensor buffering - without external op-amps or digital controllers. The INA2126UA's internal 80kΩ resistor is laser-trimmed for ±0.02% gain accuracy at G = 5.
Does the INA2126UA require external offset trimming in typical applications?
No, the INA2126UA does not require external offset trimming in most applications due to its factory-trimmed architecture: input offset voltage is guaranteed ≤±250μV and offset drift ≤±3μV/°C across –40°C to +85°C. These specifications ensure <0.25% gain error at G = 1000 for 10mV inputs without calibration. Only high-precision systems demanding <50μV total offset (e.g., laboratory-grade weigh scales) would need optional trimming circuits - such as an op-amp buffer driving RefA/RefB with a precision DAC - as described in Figure 7-2 of the INA2126UA datasheet.
INA2126UA 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:
- 150 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
INA2126UA FAQ
1.How can I place an order for INA2126UA through Aetrix?
Please submit a Request for Quotation (RFQ) for INA2126UA 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 INA2126UA reliable?
The price and inventory of INA2126UA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA2126UA is usually 5 days.
3.What payment methods are accepted for INA2126UA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA2126UA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA2126UA?
INA2126UA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA2126UA 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 INA2126UA?
For technical support, including INA2126UA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA2126UA requirements.
6.How does Aetrix verify that INA2126UA is sourced from the original manufacturer or authorized distributors?
All INA2126UA 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 INA2126UA meets industry standards.
7.What is the process for return or replacement of INA2126UA?
All INA2126UA units undergo pre-shipment inspection (PSI). If there is an issue with INA2126UA, 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 INA2126UA part is unused and in its original packaging.
Return procedure for INA2126UA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
INA2126UA Tags
-
LM358DT
STMicroelectronics
-
LM358DR
Texas Instruments
-
LM2904DR
Texas Instruments
-
LM358ADR
Texas Instruments
-
LM2904DGKR
Texas Instruments
-
LM324DR
Texas Instruments
-
MCP6006T-E/OT
Microchip Technology
-
MCP6006UT-E/OT
Microchip Technology
-
LM324PWR
Texas Instruments
-
LM2902PWR
Texas Instruments
-
LM2902DR
Texas Instruments
-
LM358P
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
