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Texas Instruments INA2126EA/2K5
- Part No.:
- INA2126EA/2K5
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
INA2126EA/2K5.pdf
- Description:
- IC INST AMP 2 CIRCUIT 16SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,639
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Product details
Overview
INA2126EA/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 maximum offset voltage, 3 μV/°C max drift, 35 nV/√Hz input voltage noise, ±1.35 V to ±18 V dual-supply operation, and gain programmability from 5 V/V to 10,000 V/V via a single external resistor - enabling high-accuracy sensor interfacing in ECG front-ends and flow transmitters.
For engineers reviewing the INA2126EA/2K5 datasheet, INA2126EA/2K5 pinout, INA2126EA/2K5 application, or INA2126EA/2K5 equivalent, key selection considerations include dual-channel channel separation (130 dB dc), low 175 μA/channel quiescent current, SSOP-16 package thermal resistance (115.8 °C/W RθJA), and guaranteed operation across –40°C to +85°C.
Technical Context
The INA2126EA/2K5 implements a two-op-amp topology that reduces power consumption versus traditional three-op-amp instrumentation amplifiers while maintaining high common-mode rejection (94 dB at G=5, VCM = ±11.25 V) and balanced, high-input impedance (>1 GΩ). Its internal laser-trimmed 40 kΩ and 10 kΩ thin-film resistor network enables precise gain setting with minimal drift.
Each channel features independent Sense and Ref pins: SenseA/B must be connected directly to VOA/VOB for accurate load-referred output, while RefA/B accept low-impedance reference biasing to shift output DC level - supporting single-supply operation down to 2.7 V total supply when driven mid-rail.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Quiescent Current | 175 μA per channel - enables >1-year battery life in portable medical sensors with dual-channel signal conditioning. |
| Input Offset Voltage | ±250 μV maximum - supports sub-100 μV resolution in strain-gauge bridge measurements at G=100. |
| Offset Drift | ±3 μV/°C maximum - ensures <±24 μV total drift over –40°C to +85°C ambient, critical for uncalibrated industrial transmitters. |
| Voltage Noise | 35 nV/√Hz at 1 kHz - preserves SNR in low-frequency biosignal acquisition (e.g., ECG, EEG) without requiring additional filtering. |
| Gain Range | 5 V/V to 10,000 V/V - set by single external RG resistor; 80 kΩ internal ladder enables stable high-gain configurations up to 1000× with <±0.5% error. |
| Common-Mode Rejection | 94 dB at G=5 - rejects 60 Hz mains interference in noisy plant-floor environments without external guard traces. |
| Supply Range | ±1.35 V to ±18 V dual or 2.7 V to 36 V single - supports direct interface to 3.3 V microcontrollers and legacy ±15 V analog backplanes. |
Pinout & Package
INA2126EA/2K5 is housed in a 16-pin SSOP (DBQ) package with 0.65 mm pitch, 5.0 mm × 6.2 mm body size, and exposed thermal pad for enhanced heat dissipation in compact PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | V–INA | Negative input of Channel A - requires matched trace impedance and low-noise grounding for optimal CMRR. |
| 2 | V+INA | Positive input of Channel A - differential pair with Pin 1; forms high-Z, balanced interface to resistive sensors. |
| 3, 4 | RGA | Channel A gain-setting node - connect external RG between Pins 3 and 4; values from 80.6 Ω (G=1000) to open (G=5). |
| 5 | RefA | Channel A output reference - must be driven by ≤8 Ω source impedance to maintain >80 dB CMRR; typically tied to mid-supply or DAC output. |
| 6 | VOA | Channel A output - connects to SenseA (Pin 7) for load-sense accuracy; drives 25 kΩ minimum load. |
| 7 | SenseA | Channel A feedback sense - short to VOA for standard operation; route directly to remote load to compensate for PCB trace IR drop. |
| 8 | V– | Negative supply rail - decouple with 0.1 μF ceramic capacitor placed within 2 mm of pin for stability. |
| 9 | V+ | Positive supply rail - same decoupling requirement as Pin 8; shared rail supports dual-channel simultaneous operation. |
| 10 | SenseB | Channel B feedback sense - identical function to Pin 7; independent routing prevents crosstalk-induced gain error. |
| 11 | VOB | Channel B output - electrically isolated from VOA; enables true dual-channel data acquisition without multiplexing delay. |
| 12 | RefB | Channel B output reference - independently configurable from RefA; allows differential output referencing or offset stacking. |
| 13, 14 | RGB | Channel B gain-setting node - fully independent of RGA; supports different gains per channel (e.g., GA=100, GB=10). |
| 15 | V+INB | Positive input of Channel B - mirrored functionality to Pin 2; differential pair with Pin 16. |
| 16 | V–INB | Negative input of Channel B - completes second independent instrumentation path; enables mixed-signal sensor fusion. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent channels | Zero shared bias circuitry - eliminates inter-channel crosstalk (<130 dB dc) and enables simultaneous acquisition of disparate sensor types (e.g., pressure + temperature). |
| Two-op-amp architecture | Reduces quiescent current by ~40% vs. three-op-amp IAs - achieves 175 μA/channel while retaining 94 dB CMRR and 200 kHz bandwidth at G=5. |
| Laser-trimmed internal resistors | 40 kΩ/10 kΩ metal-film network - guarantees gain accuracy to ±0.1% at G=5 and ±0.5% at G=100 without external trimming. |
| Input protection diodes | Integrated rail-clamp diodes - withstand ±0.7 V overvoltage relative to V+ or V–, eliminating need for external TVS in most industrial I/O designs. |
| Single-supply compatibility | Ref pin control enables rail-to-rail output swing with 2.7 V total supply - supports direct connection to 3.3 V ADCs without level-shifting circuitry. |
Applications
| ECG Front-End | Industrial Flow Transmitter |
|---|---|
|
Use Scenario: Amplifying microvolt-level differential signals from Ag/AgCl electrodes while rejecting 60 Hz common-mode interference in ambulatory monitors. IC Role / Device Role / Timing Role: Dual-channel IA conditioning lead I and lead II signals simultaneously, with independent gain and reference control per channel. Use Value: 35 nV/√Hz noise and 94 dB CMRR enable clean QRS complex detection without notch filtering, reducing firmware complexity and power consumption. |
Use Scenario: Converting millivolt outputs from electromagnetic flow meters into robust 4–20 mA transmitter inputs under harsh factory EMI conditions. IC Role / Device Role / Timing Role: Precision differential amplifier stage providing programmable gain (G=100–500) and rail-compatible output for current-loop driver ICs. Use Value: ±250 μV offset and ±3 μV/°C drift eliminate field recalibration needs across temperature cycles, extending maintenance intervals by 2×. |
| Multiparameter Patient Monitor | AC Charging Station Sensor Hub |
|
Use Scenario: Consolidating analog inputs from SpO₂, respiration, and temperature sensors onto a single PCB with minimal component count. IC Role / Device Role / Timing Role: Dual-channel signal conditioner handling two independent sensor modalities (e.g., thermistor + photodiode) with separate gain and reference settings. Use Value: Independent RefA/RefB pins allow one channel to be referenced to ADC VREF and the other to a precision voltage source - simplifying multi-rail system design. |
Use Scenario: Monitoring isolation resistance and coolant temperature in EV charging infrastructure with long cable runs and high common-mode noise. IC Role / Device Role / Timing Role: High-CMRR front-end for galvanic isolation monitoring circuits, rejecting >100 Vpp common-mode transients induced by switching inverters. Use Value: 130 dB channel separation and SSOP-16 layout compatibility prevent cross-coupling between safety-critical isolation sensing and auxiliary temperature channels. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar instrumentation amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA2128EA/2K5 | Same dual-channel SSOP-16 package but with 10 μV/°C max offset drift and 50 nV/√Hz noise - higher power (250 μA/ch) and wider offset range (±500 μV). | Better suited for cost-sensitive industrial automation where ultra-low drift is not required; less ideal for battery-powered medical devices. | Select INA2128EA/2K5 only if system-level calibration compensates for higher drift and noise; INA2126EA/2K5 remains preferred for uncalibrated portable use. |
| AD8426ARZ | Dual-channel IA in SOIC-16; lower noise (25 nV/√Hz), higher bandwidth (1.5 MHz at G=1), but higher IQ (450 μA/ch) and narrower supply (±2.5 V to ±18 V). | Optimized for high-speed data acquisition (e.g., vibration analysis), not micropower portable systems; lacks single-supply flexibility below 5 V. | Choose AD8426ARZ when bandwidth >200 kHz is mandatory and power budget allows >2× higher current; INA2126EA/2K5 is superior for <200 μA/ch constraints. |
Compared with INA2128EA/2K5 and AD8426ARZ, the INA2126EA/2K5 uniquely balances ultra-low quiescent current (175 μA/ch), precision drift (±3 μV/°C), and SSOP-16 footprint - making it the only option qualified for both battery-operated medical wearables and industrial transmitters requiring long-term zero-drift stability without recalibration.
Availability
INA2126EA/2K5 is available at Aetrix Electronics and suitable for ECG front-ends, industrial flow transmitters, and AC charging station sensor hubs requiring stable component supply across extended product lifecycles.
Supply support for INA2126EA/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 decades of expertise in precision signal chain solutions.
The INAx126 family was designed specifically for low-power, high-accuracy instrumentation in portable and distributed industrial measurement systems - emphasizing micropower operation, laser-trimmed gain accuracy, and robust common-mode rejection in compact packages.
FAQ
What is the maximum gain achievable with INA2126EA/2K5 and how is it set?
The INA2126EA/2K5 supports gains from 5 V/V to 10,000 V/V using a single external resistor (RG) connected between its dedicated gain pins (Pins 3–4 for Channel A, 13–14 for Channel B). The gain equation is G = 5 + (80 kΩ / RG). For G = 10,000, RG = 8.0 Ω; TI recommends using the nearest 1% value (7.87 Ω) and verifying layout parasitics do not introduce gain error. The INA2126EA/2K5's internal laser-trimmed resistor network ensures this relationship holds across temperature and supply variations.
Does INA2126EA/2K5 require external capacitors for stability?
Yes - the INA2126EA/2K5 requires 0.1 μF ceramic decoupling capacitors placed within 2 mm of both V+ (Pin 9) and V– (Pin 8) pins to ensure stable operation across its full supply range (±1.35 V to ±18 V). Additional 10 nF capacitors may be needed on RefA/RefB (Pins 5/12) if driving from high-impedance sources, as >8 Ω source impedance degrades CMRR. The INA2126EA/2K5 is not unity-gain stable and does not require output compensation networks under standard loads (≥25 kΩ).
Can INA2126EA/2K5 operate from a single 3.3V supply?
Yes - the INA2126EA/2K5 supports single-supply operation from 2.7 V to 36 V. With a 3.3 V supply, connect RefA and RefB (Pins 5 and 12) to 1.65 V (mid-supply) using a low-impedance divider or precision reference; this centers the output swing and avoids saturation. Input common-mode range shrinks to approximately 0.2 V to 3.1 V, and output swing is limited to ~0.75 V to 2.55 V. The INA2126EA/2K5 maintains 175 μA/channel quiescent current and full 250 μV offset spec under these conditions.
What is the purpose of SenseA and SenseB pins on INA2126EA/2K5?
SenseA (Pin 7) and SenseB (Pin 10) are dedicated feedback sense terminals that must be connected directly to VOA (Pin 6) and VOB (Pin 11), respectively, for proper closed-loop operation. This configuration enables Kelvin sensing at the load, compensating for voltage drop across PCB traces or connectors. Unlike standard op-amps, the INA2126EA/2K5 uses these pins to maintain gain accuracy and output linearity even when driving remote loads - a critical feature for precision transmitter modules where trace resistance would otherwise introduce gain error.
How does channel separation performance impact dual-sensor applications with INA2126EA/2K5?
The INA2126EA/2K5 guarantees ≥130 dB dc channel separation, meaning a full-scale signal on Channel A induces less than 1 μV of error on Channel B's output. This enables truly independent signal paths - essential when measuring unrelated parameters (e.g., pressure and temperature) on the same board. Layout best practices (separated input traces, grounded guard rings, balanced capacitance) preserve this spec up to 100 kHz; above that, crosstalk rises due to capacitive coupling, but remains <–80 dB at 1 MHz per typical characterization curves in the INA2126EA/2K5 datasheet.
INA2126EA/2K5 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-SSOP (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:
- 50 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:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SSOP
INA2126EA/2K5 FAQ
1.How can I place an order for INA2126EA/2K5 through Aetrix?
Please submit a Request for Quotation (RFQ) for INA2126EA/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 INA2126EA/2K5 reliable?
The price and inventory of INA2126EA/2K5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA2126EA/2K5 is usually 5 days.
3.What payment methods are accepted for INA2126EA/2K5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA2126EA/2K5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA2126EA/2K5?
INA2126EA/2K5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA2126EA/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 INA2126EA/2K5?
For technical support, including INA2126EA/2K5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA2126EA/2K5 requirements.
6.How does Aetrix verify that INA2126EA/2K5 is sourced from the original manufacturer or authorized distributors?
All INA2126EA/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 INA2126EA/2K5 meets industry standards.
7.What is the process for return or replacement of INA2126EA/2K5?
All INA2126EA/2K5 units undergo pre-shipment inspection (PSI). If there is an issue with INA2126EA/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 INA2126EA/2K5 part is unused and in its original packaging.
Return procedure for INA2126EA/2K5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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