My Inquiry
My Account
Texas Instruments INA2126E/2K5
- Part No.:
- INA2126E/2K5
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
INA2126E/2K5.pdf
- Description:
- IC INST AMP 2 CIRCUIT 16SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,383
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
INA2126E/2K5 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 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 V/V to 10,000 V/V via a single external resistor - enabling high-accuracy sensor interfacing in portable ECG monitors and flow transmitters.
For engineers reviewing the INA2126E/2K5 datasheet, INA2126E/2K5 pinout, INA2126E/2K5 application, or INA2126E/2K5 equivalent, key selection criteria include guaranteed dual-channel channel separation (130 dB dc), low 175 μA/channel quiescent current, SSOP-16 package thermal performance (RθJA = 115.8 °C/W), and validated operation across –40°C to +85°C industrial temperature range.
Technical Context
The INA2126E/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) and balanced, high-input impedance (1 GΩ || 4 pF). Its internal laser-trimmed 40 kΩ and 10 kΩ thin-film resistors enable precise gain setting via external RG, with gain error as low as ±0.02% at G=5.
Each channel features independent reference (RefA/RefB), sense (SenseA/SenseB), and gain-setting terminals (RGA/RGB), allowing individual gain configuration and direct output sensing at the load for improved accuracy. The device supports both dual-supply (±1.35 V to ±18 V) and single-supply (2.7 V to 36 V) operation, with Ref pins requiring low-impedance drive to preserve CMRR.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Channels | Dual independent instrumentation amplifier channels with separate gain, reference, and sense pins. |
| Supply Voltage Range | ±1.35 V to ±18 V dual supply; enables operation from ultra-low-voltage battery sources up to industrial rails. |
| Quiescent Current | ±175 μA per channel; allows continuous operation in battery-powered devices for months without replacement. |
| Input Offset Voltage | ±250 μV maximum (RTI); ensures sub-millivolt measurement accuracy without trimming in most sensor applications. |
| Gain Range | 5 V/V to 10,000 V/V set by single external resistor; supports wide dynamic range from mV-level thermocouples to µV-level strain gauges. |
| Input Voltage Noise | 35 nV/√Hz at 1 kHz (CSO: SHE); preserves signal integrity in low-amplitude, high-resolution biomedical sensing. |
| Channel Separation | 130 dB at DC; prevents crosstalk between channels in dual-sensor systems like multiparameter patient monitors. |
Pinout & Package
INA2126E/2K5 is housed in a 16-pin SSOP (DBQ) package with 0.65 mm lead pitch, optimized for compact industrial PCB layouts and moderate thermal dissipation (RθJA = 115.8 °C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 16 | V–INA / V–INB | Negative differential inputs for Channel A and B; require matched source impedances for optimal CMRR. |
| 2, 15 | V+INA / V+INB | Positive differential inputs for Channel A and B; form high-impedance, balanced input pairs. |
| 3–4, 13–14 | RGA / RGB | Gain-setting terminals; connect external resistor between pins to set gain per channel (G = 5 + 80 kΩ/RG). |
| 5, 12 | RefA / RefB | Reference inputs; must be driven by low-impedance source (e.g., op-amp buffer or mid-rail divider) to avoid CMRR degradation. |
| 6, 11 | VOA / VOB | Amplifier outputs; swing within 0.75–0.95 V of supply rails, limiting usable output range in low-voltage designs. |
| 7, 10 | SenseA / SenseB | Feedback sense terminals; connect directly to respective output pins (VOA/VOB) to close local feedback loop and improve load regulation. |
| 8 | V– | Negative supply rail; shared across both channels; requires local 0.1 µF decoupling for noise immunity. |
| 9 | V+ | Positive supply rail; shared across both channels; same decoupling requirement as V–. |
Key Features
| Feature | Design Value |
|---|---|
| Two-op-amp architecture | Reduces quiescent current by ~30% vs. three-op-amp IAs while preserving high CMRR and input impedance. |
| Laser-trimmed internal resistors | Enables ±0.02% gain error at G=5 and ±2 ppm/°C gain drift - eliminates need for external calibration in many applications. |
| Independent sense and reference pins | Allows per-channel output sensing and level-shifting, supporting isolated or floating load configurations without signal degradation. |
| Wide common-mode input range | Operates with VCM = ±11.25 V at ±15 V supplies - accommodates high common-mode signals from bridge sensors and current shunts. |
| Low-frequency noise performance | 0.7 µVPP (0.1–10 Hz) enables stable DC-coupled measurements in infusion pumps and electrocardiogram systems. |
Applications
| Level Transmitter | Flow Transmitter |
|---|---|
|
Use Scenario: Amplifying low-level mV output from pressure transducers in industrial tank monitoring systems. IC Role / Device Role / Timing Role: Dual-channel IA acquires differential sensor output while rejecting common-mode noise from long cable runs and motor drives. Use Value: 130 dB channel separation prevents cross-talk between redundant sensors; ±250 μV offset ensures <0.1% full-scale error in 4–20 mA loop calibration. |
Use Scenario: Signal conditioning for electromagnetic flow meters measuring conductive liquid velocity in water treatment plants. IC Role / Device Role / Timing Role: Precision IA extracts microvolt-level induced voltage across electrodes while rejecting 50/60 Hz mains interference. Use Value: 94 dB CMRR at G=5 suppresses line-frequency noise; 35 nV/√Hz noise floor maintains SNR > 80 dB for sub-1% flow accuracy. |
| Multiparameter Patient Monitor | Electrocardiogram (ECG) |
|
Use Scenario: Simultaneous acquisition of respiration, temperature, and SpO₂ analog signals in bedside clinical monitors. IC Role / Device Role / Timing Role: Dual IA channels condition multiple low-amplitude biopotential signals with independent gain and reference control. Use Value: Independent RefA/RefB pins allow each channel to interface with different sensor biasing schemes; 175 μA/channel current extends battery life in portable units. |
Use Scenario: Front-end amplification of 0.5–2 mV cardiac signals from dry or gel electrodes with high 50/60 Hz interference. IC Role / Device Role / Timing Role: High-CMRR IA rejects common-mode electrode offset and mains pickup before ADC digitization. Use Value: 0.7 µVPP (0.1–10 Hz) low-frequency noise ensures clean baseline stability; ±3 μV/°C drift minimizes thermal drift during extended recordings. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar instrumentation amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA2128E/2K5 | Higher precision: ±100 μV max offset, ±0.5 μV/°C drift, but higher 250 μA/channel quiescent current. | Better suited for laboratory-grade measurement where offset stability outweighs battery life. | Select INA2128E/2K5 when absolute DC accuracy is prioritized over micropower operation. |
| AD8226ARZ | Single-channel, lower cost, wider bandwidth (1.5 MHz @ G=100), but higher 350 μA quiescent current and no sense pins. | Appropriate for non-critical industrial sensing where dual-channel integration is not required. | Choose AD8226ARZ for cost-sensitive, single-sensor applications needing faster settling or simpler layout. |
Compared with INA2126E/2K5, INA2128E/2K5 trades 75 μA/channel extra current for 2× better offset and drift specs, while AD8226ARZ offers higher speed and lower price at the expense of dual-channel integration and micropower capability.
Availability
INA2126E/2K5 is available at Aetrix Electronics and suitable for level transmitter, flow transmitter, and multiparameter patient monitor applications requiring stable component supply, long-term industrial lifecycle support, and traceable sourcing from authorized channels.
Supply support for INA2126E/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 product line was engineered specifically for low-power, high-accuracy instrumentation in portable and industrial measurement systems - emphasizing micropower operation, laser-trimmed gain accuracy, and robust common-mode rejection across wide supply ranges.
FAQ
What is the maximum gain achievable with INA2126E/2K5?
The INA2126E/2K5 supports gains from 5 V/V to 10,000 V/V using an external resistor RG per channel, calculated as G = 5 + 80 kΩ/RG. At G = 10,000, RG = 8.0 Ω (7.87 Ω standard value), requiring careful layout to minimize parasitic resistance. The INA2126E/2K5 maintains specified performance across this full range under recommended operating conditions.
Does INA2126E/2K5 require external capacitors on the Sense pins?
No - the SenseA and SenseB pins of the INA2126E/2K5 must be connected directly to their respective outputs (VOA and VOB) with short, low-inductance traces; no external capacitors are required or recommended. This connection closes the local feedback loop to improve load regulation and maintain accuracy, as specified in the TI SBOS062D datasheet for the INA2126E/2K5.
Can INA2126E/2K5 operate from a single 5V supply?
Yes - the INA2126E/2K5 supports single-supply operation from 2.7 V to 36 V. For 5 V operation, the RefA and RefB pins must be biased to ~2.5 V (mid-supply) using a low-impedance source to keep both amplifiers within linear range. Input common-mode voltage must remain within limits shown in Figure 5-7 of the INA2126E/2K5 datasheet.
What is the purpose of the RGA and RGB pins on INA2126E/2K5?
RGA (pins 3–4) and RGB (pins 13–14) are dedicated gain-setting terminals for Channel A and Channel B respectively. Each pair accepts a single external resistor to configure gain independently per channel using G = 5 + 80 kΩ/RG. This enables asymmetric gain setups - for example, one channel at G=100 for ECG and another at G=5 for temperature - without external op-amps, making the INA2126E/2K5 highly flexible in multi-sensor systems.
How does channel separation performance impact dual-sensor designs using INA2126E/2K5?
The INA2126E/2K5 guarantees 130 dB channel separation at DC, meaning leakage from one channel into the other is attenuated by a factor of 10⁶·⁵. In practice, this prevents signal coupling between adjacent sensors - such as pressure and temperature inputs in a mixed-module AI/AO system - ensuring independent, accurate measurements without post-processing correction. Layout best practices further enhance this spec in high-frequency scenarios.
INA2126E/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
INA2126E/2K5 FAQ
1.How can I place an order for INA2126E/2K5 through Aetrix?
Please submit a Request for Quotation (RFQ) for INA2126E/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 INA2126E/2K5 reliable?
The price and inventory of INA2126E/2K5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA2126E/2K5 is usually 5 days.
3.What payment methods are accepted for INA2126E/2K5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA2126E/2K5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA2126E/2K5?
INA2126E/2K5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA2126E/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 INA2126E/2K5?
For technical support, including INA2126E/2K5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA2126E/2K5 requirements.
6.How does Aetrix verify that INA2126E/2K5 is sourced from the original manufacturer or authorized distributors?
All INA2126E/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 INA2126E/2K5 meets industry standards.
7.What is the process for return or replacement of INA2126E/2K5?
All INA2126E/2K5 units undergo pre-shipment inspection (PSI). If there is an issue with INA2126E/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 INA2126E/2K5 part is unused and in its original packaging.
Return procedure for INA2126E/2K5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
INA2126E/2K5 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…
