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Home > Products > Integrated Circuits (ICs) > Linear > Instrumentation, Op Amps, Buffer Amps

Texas Instruments INA2126E/250

Name: INA2126E/250
Brand: Texas Instruments
SKU: INA2126E/250
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: INA2126E/250

Manufacturer:: Texas Instruments

Category:: Instrumentation, Op Amps, Buffer Amps

Package:: 16-SSOP (0.154", 3.90mm Width)

Datasheet:: INA2126E/250.pdf

Description:: IC INST AMP 2 CIRCUIT 16SSOP

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Product details

Overview

INA2126E/250 from Texas Instruments is a dual-channel, micropower instrumentation amplifier designed for precision differential signal acquisition in low-power industrial and medical sensor interfaces. It delivers 250 μV max 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× to 10,000× via a single external resistor - enabling high-accuracy current sensing in portable ECG monitors and flow transmitters.

For engineers reviewing the INA2126E/250 datasheet, INA2126E/250 pinout, INA2126E/250 application, or INA2126E/250 equivalent, key selection considerations include its dual-channel SSOP-16 package, guaranteed –40°C to +85°C operation, 175 μA/channel quiescent current, 80 dB min CMRR at G=5, and dedicated SenseA/SenseB feedback terminals for load-referred output accuracy.

Technical Context

The INA2126E/250 implements a two-op-amp topology that reduces power versus traditional three-op-amp instrumentation amplifiers while maintaining high input impedance and balanced input structure. Its internal laser-trimmed 40 kΩ and 10 kΩ thin-film resistors set the base gain of 5× and enable precise external gain scaling via RG (G = 5 + 80 kΩ/RG).

Each channel features independent reference (RefA/RefB), sense (SenseA/SenseB), and gain-setting (RGA/RGB) terminals - supporting separate gain configuration, output level-shifting, and remote-sense feedback for improved load regulation. The device operates with true rail-to-rail input common-mode range down to (V–) + 0.5 V and output swing within 0.75 V of rails under ±15 V supply.

Key Specifications

Parameter	Value and Actual Design Meaning
Channels	Dual independent instrumentation amplifier channels with fully isolated bias networks and feedback paths.
Gain Range	5× to 10,000× set by single external resistor RG; G = 5 + 80 kΩ/RG enables predictable, temperature-stable scaling.
Input Offset Voltage	±250 μV maximum (RTI); ensures ≤0.1% gain error at G=100 for 100 mV input signals without trimming.
Quiescent Current	±175 μA per channel; supports battery-powered operation >1 year on a single CR2032 cell in sleep-mode sensor nodes.
CMRR	80 dB minimum at G=5 (DC), 94 dB typical; rejects 100:1 common-mode interference in bridge-based strain gauge systems.
Supply Range	±1.35 V to ±18 V dual supply or 2.7 V to 36 V single supply; accommodates both low-voltage IoT sensors and industrial ±15 V PLC inputs.
Bandwidth	200 kHz at G=5 (CSO:SHE); sufficient for 50/60 Hz line-frequency rejection and fast transient capture in infusion pump motor control.

Pinout & Package

INA2126E/250 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 power dissipation in compact PCB layouts.

Pin/Terminal	Circuit Role	Design Meaning
1	V–INA	Negative input of Channel A; high-impedance node requiring low-leakage PCB layout and bias current return path.
2	V+INA	Positive input of Channel A; matched to Pin 1 for optimal common-mode rejection in differential sensor interfaces.
3, 4	RGA	Channel A gain-setting terminals; connect external resistor between Pins 3 and 4 to set G = 5 + 80 kΩ/RG.
5	RefA	Channel A reference input; must be driven by low-impedance source (≤8 Ω) to maintain ≥80 dB CMRR.
6	VOA	Channel A output; connects to SenseA (Pin 7) for local feedback or to remote load for sense-point accuracy.
7	SenseA	Channel A output sense terminal; tie directly to VOA for standard operation or to load for Kelvin-sense correction.
8	V–	Negative supply rail; decoupling capacitor required within 10 mm for stable operation at full bandwidth.
9	V+	Positive supply rail; shared by both channels; requires independent 0.1 μF ceramic bypass near Pin 9.
10	SenseB	Channel B output sense terminal; identical function to Pin 7 but electrically isolated for dual-channel independence.
11	VOB	Channel B output; routed separately from VOA to prevent crosstalk; supports independent load connections.
12	RefB	Channel B reference input; independently configurable from RefA for multi-range or ratiometric sensor systems.
13, 14	RGB	Channel B gain-setting terminals; supports different gain than Channel A using separate RG resistor.
15	V+INB	Positive input of Channel B; fully isolated from Channel A inputs to minimize inter-channel crosstalk (<–130 dB @ DC).
16	V–INB	Negative input of Channel B; symmetric layout with Pin 15 ensures matched parasitics and CMRR performance.

Key Features

Feature	Design Value
Two-op-amp architecture	Reduces quiescent current by ~30% vs. three-op-amp IAs while preserving high input impedance and CMRR stability.
Dedicated Sense terminals	Enables remote-sense feedback for each channel, correcting for PCB trace resistance and improving load regulation to ±0.01%.
Laser-trimmed internal resistors	40 kΩ and 10 kΩ metal-film resistors provide <±0.1% absolute tolerance and <5 ppm/°C TC, minimizing gain drift contribution.
Independent Ref and Sense per channel	Allows simultaneous ratiometric (Ref tied to sensor excitation) and ground-referenced (Ref = 0 V) operation in mixed-signal modules.
Low 1/f noise corner	0.7 μVPP integrated noise (0.1–10 Hz) enables stable DC-coupled measurements in electrocardiogram (ECG) front-ends.

Applications

Level Transmitter	Flow Transmitter
Use Scenario: Amplifying mV-level differential output from pressure transducers in industrial tank monitoring systems with 4–20 mA loop power constraints. IC Role / Device Role / Timing Role: Precision instrumentation amplifier conditioning bridge sensor output while operating from ±5 V rails with <200 μA total supply current. Use Value: 250 μV max offset ensures ≤0.25% FS error at 100 mV span; 3 μV/°C drift limits thermal error to <0.3% over –40°C to +85°C ambient.	Use Scenario: Signal conditioning for turbine or Coriolis flow meters where differential voltage varies with fluid velocity and must reject EMI from nearby VFDs. IC Role / Device Role / Timing Role: Dual-channel IA acquiring synchronized upstream/downstream sensor pairs with independent gain and reference settings. Use Value: 80 dB min CMRR suppresses 60 Hz magnetic pickup; 130 dB channel separation prevents cross-talk between parallel flow measurement paths.
Multiparameter Patient Monitor	Electrocardiogram (ECG)
Use Scenario: Simultaneous acquisition of respiration (thermistor), temperature (RTD), and SpO₂ (photodiode) signals in portable clinical devices. IC Role / Device Role / Timing Role: Dual-channel IA providing isolated, low-noise amplification for multiple analog sensor types with shared power domain. Use Value: 35 nV/√Hz noise floor preserves microvolt-level biopotential resolution; 175 μA/channel enables >72-hour battery life in Class II medical devices.	Use Scenario: Front-end amplification of 0.5–5 mV cardiac signals from Ag/AgCl electrodes in ambulatory ECG recorders. IC Role / Device Role / Timing Role: Primary instrumentation amplifier rejecting 1 VPP 50/60 Hz common-mode interference while delivering 250× gain with minimal added noise. Use Value: 0.7 μVPP 0.1–10 Hz noise ensures diagnostic-grade ST-segment fidelity; dual-channel design supports lead-I/lead-II simultaneous acquisition.

Level Transmitter

Flow Transmitter

Use Scenario: Amplifying mV-level differential output from pressure transducers in industrial tank monitoring systems with 4–20 mA loop power constraints.

IC Role / Device Role / Timing Role: Precision instrumentation amplifier conditioning bridge sensor output while operating from ±5 V rails with <200 μA total supply current.

Use Value: 250 μV max offset ensures ≤0.25% FS error at 100 mV span; 3 μV/°C drift limits thermal error to <0.3% over –40°C to +85°C ambient.

Use Scenario: Signal conditioning for turbine or Coriolis flow meters where differential voltage varies with fluid velocity and must reject EMI from nearby VFDs.

IC Role / Device Role / Timing Role: Dual-channel IA acquiring synchronized upstream/downstream sensor pairs with independent gain and reference settings.

Use Value: 80 dB min CMRR suppresses 60 Hz magnetic pickup; 130 dB channel separation prevents cross-talk between parallel flow measurement paths.

Multiparameter Patient Monitor

Electrocardiogram (ECG)

Use Scenario: Simultaneous acquisition of respiration (thermistor), temperature (RTD), and SpO₂ (photodiode) signals in portable clinical devices.

IC Role / Device Role / Timing Role: Dual-channel IA providing isolated, low-noise amplification for multiple analog sensor types with shared power domain.

Use Value: 35 nV/√Hz noise floor preserves microvolt-level biopotential resolution; 175 μA/channel enables >72-hour battery life in Class II medical devices.

Use Scenario: Front-end amplification of 0.5–5 mV cardiac signals from Ag/AgCl electrodes in ambulatory ECG recorders.

IC Role / Device Role / Timing Role: Primary instrumentation amplifier rejecting 1 VPP 50/60 Hz common-mode interference while delivering 250× gain with minimal added noise.

Use Value: 0.7 μVPP 0.1–10 Hz noise ensures diagnostic-grade ST-segment fidelity; dual-channel design supports lead-I/lead-II simultaneous acquisition.

Equivalent & Alternatives

The following parts are listed as comparable options for similar instrumentation amplifier applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
INA2128E/250	Same dual-channel SSOP-16 package and pinout; 125 μV max offset (vs. 250 μV), 1.5 μV/°C max drift (vs. 3 μV/°C), 25 nV/√Hz noise (vs. 35 nV/√Hz).	Better DC precision for high-resolution weigh scales; slightly higher cost and same power consumption.	Select INA2128E/250 when offset and drift dominate system error budget; retain INA2126E/250 for cost-sensitive, noise-tolerant designs.
AD8226ARZ	Single-channel SOIC-8; 200 μV max offset, 1 μV/°C drift, 40 nV/√Hz noise, 350 μA quiescent current, no Sense/Ref pins.	Higher power, no remote sense, single-channel only - requires two units for dual-sensor applications.	Choose AD8226ARZ only for space-constrained single-channel use cases where Sense/Ref flexibility is unnecessary and 350 μA IQ is acceptable.

Compared with INA2126E/250, INA2128E/250 improves DC accuracy at identical packaging and power, while AD8226ARZ trades channel count, sense capability, and quiescent current for broader availability and simplified layout - making INA2126E/250 optimal for dual-sensor, low-power, remote-sense industrial and medical systems.

Availability

INA2126E/250 is available at Aetrix Electronics and suitable for level transmitter calibration, flow meter signal conditioning, and multiparameter patient monitor production requiring stable component supply across extended industrial temperature ranges and long product lifecycles.

Supply support for INA2126E/250 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 for industrial, automotive, and medical markets.

The INAx126 family - including INA2126E/250 - was engineered for ultra-low-power, high-accuracy sensor interface applications where micropower operation, robust CMRR, and flexible gain configuration are critical in portable and distributed instrumentation systems.

FAQ

What is the maximum gain achievable with INA2126E/250 and how is it set?

The INA2126E/250 supports gains from 5× to 10,000× using an external resistor RG connected between Pins 3–4 (Channel A) or Pins 13–14 (Channel B), per the equation G = 5 + 80 kΩ/RG. For 10,000× gain, a 7.87 Ω resistor is required; layout parasitics and RG tolerance become critical above G=1000. The INA2126E/250 datasheet specifies gain error up to ±1% at G=1000, validated across –40°C to +85°C.

Does INA2126E/250 require external components for basic operation?

Yes - the INA2126E/250 requires at minimum: (1) a gain-setting resistor RG per channel, (2) 0.1 μF ceramic decoupling capacitors on V+ (Pin 9) and V– (Pin 8), and (3) low-impedance connections for RefA (Pin 5) and RefB (Pin 12), typically tied to ground or midsupply. SenseA (Pin 7) and SenseB (Pin 10) must be shorted to VOA (Pin 6) and VOB (Pin 11) respectively unless remote-sense feedback is implemented. No external op amps or trimming networks are needed for standard operation.

How does the SenseA/SenseB functionality improve accuracy in INA2126E/250?

SenseA (Pin 7) and SenseB (Pin 10) provide dedicated feedback paths that allow the INA2126E/250 to regulate output voltage at the load rather than at the IC's output pin - compensating for voltage drop across PCB traces or connectors. When SenseA is connected to the load instead of VOA, the amplifier adjusts its internal output to maintain precise voltage at the sense point, reducing errors from trace resistance (e.g., 100 mΩ adds ≤0.1% gain error at 100 mA). This feature is unique to the INA2126E/250 among dual-channel micropower IAs.

Can INA2126E/250 operate from a single 3.3V supply?

Yes - the INA2126E/250 supports single-supply operation from 2.7 V to 36 V. At 3.3 V, the input common-mode range is limited to approximately 0.3 V to 2.7 V (per Figure 5-7), and output swing is 0.75 V below V+ and 0.95 V above V–. To maintain linearity, RefA and RefB must be biased to ~1.65 V (midsupply), and input signals must stay within the constrained CMR. The INA2126E/250 maintains 175 μA/channel IQ and 250 μV offset spec under these conditions.

What is the channel-to-channel crosstalk specification for INA2126E/250?

The INA2126E/250 guarantees ≥130 dB channel separation at DC (as measured RTI), with typical crosstalk degrading to –80 dB at 100 kHz due to capacitive coupling. This performance is achieved through fully independent bias networks, isolated input stages, and physical separation of Channel A and Channel B pins on the SSOP-16 package. Layout best practices - including guard traces between input nets and orthogonal routing of differential pairs - preserve this isolation in production PCBs.

INA2126E/250 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

INA2126E/250 FAQ

1.How can I place an order for INA2126E/250 through Aetrix?

Please submit a Request for Quotation (RFQ) for INA2126E/250 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 INA2126E/250 reliable?

The price and inventory of INA2126E/250 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA2126E/250 is usually 5 days.

3.What payment methods are accepted for INA2126E/250?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA2126E/250 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for INA2126E/250?

INA2126E/250 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your INA2126E/250 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 INA2126E/250?

For technical support, including INA2126E/250 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA2126E/250 requirements.

6.How does Aetrix verify that INA2126E/250 is sourced from the original manufacturer or authorized distributors?

All INA2126E/250 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 INA2126E/250 meets industry standards.

7.What is the process for return or replacement of INA2126E/250?

All INA2126E/250 units undergo pre-shipment inspection (PSI). If there is an issue with INA2126E/250, 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 INA2126E/250 part is unused and in its original packaging.

Return procedure for INA2126E/250:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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