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Texas Instruments INA2126UA/2K5
- Part No.:
- INA2126UA/2K5
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
INA2126UA/2K5.pdf
- Description:
- IC INST AMP 2 CIRCUIT 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,771
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Product details
Overview
INA2126UA/2K5 from Texas Instruments is a dual-channel, micropower instrumentation amplifier optimized for precision low-level differential signal acquisition in battery-powered and space-constrained industrial systems. It delivers 250 µV max offset voltage, 3 µV/°C max drift, 35 nV/√Hz input voltage noise, ±1.35V to ±18V dual-supply operation, and gain programmable from 5 to 10,000 V/V via a single external resistor - enabling high-accuracy sensor interfacing in ECG monitors and flow transmitters.
For engineers reviewing the INA2126UA/2K5 datasheet, INA2126UA/2K5 pinout, INA2126UA/2K5 application, or INA2126UA/2K5 equivalent, key selection criteria include guaranteed dual-channel channel separation (130 dB dc), low 175 µA/channel quiescent current, SOIC-16 package thermal resistance (76.2 °C/W), and verified operation across –40°C to +85°C industrial temperature range.
Technical Context
The INA2126UA/2K5 implements a two-op-amp topology that reduces power versus traditional three-op-amp instrumentation amplifiers while preserving high common-mode rejection (94 dB at G=5) and balanced input impedance. Its internal laser-trimmed 40 kΩ/10 kΩ resistor network enables precise gain setting with minimal external components.
Each channel features independent Sense and Ref pins: SenseA/B must be connected directly to VOA/VOB for accurate output feedback, and RefA/B require low-impedance biasing (typically grounded or mid-supply) to maintain CMRR. Input protection diodes clamp signals to within ±0.7 V of supply rails.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Channels | Dual independent amplifiers - supports simultaneous differential measurements without shared bias paths. |
| Gain Range | 5 to 10,000 V/V set by single RG resistor - enables scalable signal conditioning from mV-level sensor outputs to full-scale ADC inputs. |
| Input Offset Voltage | ±250 µV maximum (RTI) - ensures <0.1% error at 250 mV input with G=1000, critical for precision pressure/strain sensing. |
| Quiescent Current | ±175 µA per channel - allows continuous operation on coin-cell batteries for >1 year in portable medical devices. |
| CMRR | 94 dB minimum at G=5 (INA2126U/E grade) - rejects >99.998% of 60 Hz line noise in ECG front-ends. |
| Bandwidth | 200 kHz at G=5 (SHE chip site) - supports fast transient capture in multiparameter patient monitors. |
| Supply Range | ±1.35V to ±18V dual or 2.7V–36V single - accommodates both ultra-low-voltage IoT nodes and industrial 24V systems. |
Pinout & Package
INA2126UA/2K5 is housed in a 16-pin SOIC (D) package with 1.27 mm pitch, 10.3 mm × 7.5 mm body, and JEDEC MS-012AC footprint. Thermal resistance RθJA = 76.2 °C/W enables operation up to +85°C ambient without forced airflow.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 16 | V–INA / V–INB | Negative differential inputs for Channel A and B - require matched source impedances to minimize CMRR degradation. |
| 2, 15 | V+INA / V+INB | Positive differential inputs for Channel A and B - high-impedance (>1 GΩ) inputs enable direct thermocouple or bridge sensor connection. |
| 3–4, 13–14 | RGA / RGB | Gain-setting terminals - connect external resistor between pins to set gain per G = 5 + 80 kΩ/RG. |
| 5, 12 | RefA / RefB | Output reference inputs - must be driven by ≤8 Ω impedance source to preserve >80 dB CMRR; typically tied to ground or DAC output. |
| 6, 11 | VOA / VOB | Amplifier outputs - swing to within 0.75–0.95 V of rails; drive 25 kΩ loads with <0.1% gain error. |
| 7, 10 | SenseA / SenseB | Output feedback sense points - must be shorted directly to VOA/VOB pins for stable closed-loop operation and load-regulated accuracy. |
| 8 | V– | Negative supply rail - decoupling capacitor required within 10 mm for noise immunity in mixed-signal PCBs. |
| 9 | V+ | Positive supply rail - supports rail-to-rail output swing when referenced to mid-supply via Ref pins. |
Key Features
| Feature | Design Value |
|---|---|
| Two-op-amp architecture | Reduces quiescent current by ~40% vs. three-op-amp IAs while maintaining >130 dB dc channel separation. |
| Laser-trimmed internal resistors | Enables ±0.1% gain error at G=5 and ±1% at G=100 without external trimming - simplifies calibration in production test. |
| Independent Sense/Ref per channel | Allows local feedback sensing at remote loads and independent output level-shifting - essential for isolated sensor modules. |
| Input overvoltage protection | Internal diodes clamp inputs to within ±0.7 V of V+/V– - eliminates need for external TVS in 24V industrial fieldbus interfaces. |
| Low-frequency noise performance | 0.7 µVPP (0.1–10 Hz) - enables sub-µV resolution in infusion pump motor current monitoring. |
Applications
| ECG Signal Conditioning | Industrial Flow Transmitter |
|---|---|
|
Use Scenario: Amplifying microvolt-level differential cardiac signals from Ag/AgCl electrodes in presence of 60 Hz mains interference and motion artifacts. IC Role / Device Role / Timing Role: Dual-channel IA acquiring lead-I and lead-II simultaneously, with independent Ref pins referenced to Wilson central terminal. Use Value: 94 dB CMRR and 35 nV/√Hz noise ensure clean P/QRS/T waveforms at 250× gain, meeting ANSI/AAMI EC11 clinical standards. |
Use Scenario: Converting millivolt outputs from electromagnetic flow sensors into calibrated 4–20 mA loop signals for PLC integration. IC Role / Device Role / Timing Role: Primary signal conditioner for bidirectional flow measurement, rejecting common-mode noise from pump motor switching. Use Value: 130 dB dc channel separation prevents cross-talk between flow and temperature channels in multi-parameter transmitters. |
| Multiparameter Patient Monitor | AC Charging Station Sensor Interface |
|
Use Scenario: Simultaneous acquisition of ECG, respiration (impedance pneumography), and temperature in compact bedside units. IC Role / Device Role / Timing Role: Dual IA providing isolated, low-power analog front-end for two independent physiological signal chains. Use Value: 175 µA/channel quiescent current extends battery life to >8 hours during mobile transport, while SOIC-16 footprint fits tight PCB layouts. |
Use Scenario: Monitoring shunt resistor voltages for real-time DC current measurement and fault detection in EV charging piles. IC Role / Device Role / Timing Role: High-accuracy current sense amplifier with gain programmability for 10 A–250 A range coverage using single BOM variant. Use Value: ±250 µV offset ensures <0.5% error at 50 mV shunt drop, supporting IEC 62955 leakage current detection thresholds. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar instrumentation amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD8422ARZ | Higher 3.5 nV/√Hz noise, 1 mA/channel IQ, 16-lead SOIC but no Sense pins | Requires external feedback networks for load regulation; less suitable for remote-sensing configurations | Prefer AD8422ARZ only when bandwidth >1 MHz or CMRR >120 dB is required at G=100 |
| INA2128UA | Lower 100 µV max VOS, same 175 µA IQ, identical SOIC-16 pinout and Sense/Ref architecture | Optimized for medical-grade offset stability; shares layout and firmware compatibility | Choose INA2128UA where long-term drift <0.1 µV/°C is mandatory, accepting 20% higher cost |
Compared with AD8422ARZ and INA2128UA, the INA2126UA/2K5 offers the best balance of micropower operation, integrated Sense feedback, and industrial-grade temperature performance - making it optimal for cost-sensitive, battery-operated, or space-constrained dual-channel sensor systems.
Availability
INA2126UA/2K5 is available at Aetrix Electronics and suitable for ECG monitors, industrial flow transmitters, multiparameter patient monitors, AC charging stations, and infusion pumps requiring stable component supply across extended product lifecycles.
Supply support for INA2126UA/2K5 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 and automotive/industrial qualification expertise.
The INAx126 product line was designed specifically for low-power, high-accuracy sensor signal conditioning in portable instrumentation and industrial process control - emphasizing micropower operation, wide supply flexibility, and robustness in noisy environments.
FAQ
What is the maximum gain achievable with INA2126UA/2K5, and how is it set?
The INA2126UA/2K5 supports gains from 5 V/V to 10,000 V/V using a single external resistor (RG) connected between pins 3–4 (Channel A) or 13–14 (Channel B), per the equation G = 5 + 80 kΩ/RG. For G = 10,000, RG = 8.0 Ω (7.87 Ω 1% standard value). The INA2126UA/2K5 internal laser-trimmed resistors ensure gain accuracy remains within ±0.18% at G = 5 and ±1% at G = 100 across temperature.
Does INA2126UA/2K5 require external components for basic operation?
Yes - the INA2126UA/2K5 requires external RG resistors to set gain above 5 V/V, plus 0.1 µF decoupling capacitors on V+ and V– pins placed within 10 mm of the device. SenseA/B pins must be shorted to VOA/VOB, and RefA/B require low-impedance connections (≤8 Ω) - typically to ground or a precision voltage reference. No external offset trim is needed for most applications due to its ±250 µV max VOS.
How does the SenseA/SenseB functionality improve accuracy in INA2126UA/2K5?
SenseA and SenseB in the INA2126UA/2K5 provide Kelvin feedback connections that sense output voltage directly at the load, compensating for voltage drops across PCB traces or connectors. This maintains gain accuracy under varying load conditions - unlike conventional IAs where feedback is taken at the die pad. For INA2126UA/2K5, connecting SenseA to VOA and SenseB to VOB is mandatory for specified performance.
Can INA2126UA/2K5 operate from a single 5V supply?
Yes - the INA2126UA/2K5 supports single-supply operation from 2.7V to 36V. With a 5V supply, configure RefA/RefB at 2.5V (mid-supply) using a precision divider or buffer to center the output swing. Input common-mode range becomes limited to approximately 0.5V–4.5V, and output swing is 0.75V–4.25V. The INA2126UA/2K5 maintains 175 µA/channel IQ and full 250 µV VOS spec under these conditions.
What is the channel separation specification for INA2126UA/2K5, and why does it matter?
The INA2126UA/2K5 guarantees ≥130 dB dc channel separation, meaning signal coupling between Channel A and B is attenuated by >10⁶× at low frequencies. This prevents crosstalk in dual-sensor systems - e.g., simultaneous ECG and respiration measurement - where one channel's large common-mode signal (e.g., 60 Hz interference) could otherwise corrupt the other channel's microvolt-level signal. Layout best practices further reduce high-frequency coupling.
INA2126UA/2K5 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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/2K5 FAQ
1.How can I place an order for INA2126UA/2K5 through Aetrix?
Please submit a Request for Quotation (RFQ) for INA2126UA/2K5 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/2K5 reliable?
The price and inventory of INA2126UA/2K5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA2126UA/2K5 is usually 5 days.
3.What payment methods are accepted for INA2126UA/2K5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA2126UA/2K5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA2126UA/2K5?
INA2126UA/2K5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA2126UA/2K5 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/2K5?
For technical support, including INA2126UA/2K5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA2126UA/2K5 requirements.
6.How does Aetrix verify that INA2126UA/2K5 is sourced from the original manufacturer or authorized distributors?
All INA2126UA/2K5 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/2K5 meets industry standards.
7.What is the process for return or replacement of INA2126UA/2K5?
All INA2126UA/2K5 units undergo pre-shipment inspection (PSI). If there is an issue with INA2126UA/2K5, 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/2K5 part is unused and in its original packaging.
Return procedure for INA2126UA/2K5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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