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Texas Instruments INA126E/2K5
- Part No.:
- INA126E/2K5
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
INA126E/2K5.pdf
- Description:
- IC INST AMP 1 CIRCUIT 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,636
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Product details
Overview
INA126E/2K5 from Texas Instruments is a single-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 programmability from 5× to 10,000× via a single external resistor - enabling high-accuracy sensor interfacing in ECG monitors and flow transmitters.
For engineers reviewing the INA126E/2K5 datasheet, INA126E/2K5 pinout, INA126E/2K5 application, or INA126E/2K5 equivalent, key selection considerations include its VSSOP-8 package footprint, 175 µA/channel quiescent current, reference-pin–based output level-shifting capability, and verified performance across –40°C to +85°C for portable medical and industrial measurement designs.
Technical Context
The INA126E/2K5 implements a two-op-amp topology that reduces power consumption versus traditional three-op-amp instrumentation amplifiers while maintaining balanced, high-input impedance (≥1 GΩ) and excellent common-mode rejection. Its internal laser-trimmed 40 kΩ/10 kΩ resistor network enables precise gain setting with only one external resistor (RG), where G = 5 + 80 kΩ/RG.
It supports both dual-supply (±1.35V to ±18V) and single-supply (2.7V to 36V) operation, with the REF pin allowing output DC level shifting - critical for interfacing with ADCs operating at non-zero reference voltages. Input protection diodes clamp signals to within ~0.7 V of supply rails, and the device includes dedicated Sense feedback paths only in the dual-channel INA2126 variant.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Range | ±1.35V to ±18V dual or 2.7V–36V single - enables direct use with Li-ion batteries and industrial rails without LDO pre-regulation. |
| Quiescent Current | 175 µA per channel - allows continuous operation in multi-year battery-powered sensor nodes. |
| Offset Voltage | 250 µV maximum (RTI) - ensures ≤0.1% gain error at 100× gain for 250 mV full-scale inputs. |
| Input Noise | 35 nV/√Hz at 1 kHz - preserves SNR for µV-level thermocouple or strain gauge outputs. |
| Gain Range | 5× to 10,000× set by single RG resistor - eliminates need for multiple fixed-gain variants in BOM. |
| CMRR | 80 dB minimum (at G=5, VCM=±11.25V) - rejects 60 Hz line interference in unshielded industrial environments. |
| Operating Temp | –40°C to +85°C - qualified for deployment in outdoor metering and factory-floor equipment. |
Pinout & Package
The INA126E/2K5 is housed in an 8-pin VSSOP (DGK) package - 2.3 mm × 2.0 mm, 0.5 mm pitch - optimized for high-density PCB layouts in portable instrumentation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 8 | RG | External gain-setting node; connect resistor between pins 1 and 8 to set G = 5 + 80 kΩ/RG. |
| 2 | V–IN | Inverting input; accepts differential signal referenced to system ground or floating source. |
| 3 | V+IN | Non-inverting input; matched impedance to V–IN ensures optimal CMRR. |
| 4 | V– | Negative supply rail; must be decoupled locally with 0.1 µF ceramic capacitor. |
| 5 | Ref | Output reference node; drive with low-impedance source (e.g., DAC or divider) to shift output DC level. |
| 6 | VO | Amplified output; capable of ±14 V swing on ±15 V supplies with 25 kΩ load. |
| 7 | V+ | Positive supply rail; decoupling required adjacent to pin for stability at high gains. |
Key Features
| Feature | Design Value |
|---|---|
| Two-op-amp architecture | Reduces quiescent current by ~40% vs. three-op-amp IAs while preserving gain accuracy and CMRR. |
| Laser-trimmed internal resistors | Enables guaranteed gain error ≤0.1% at G=5 and ≤1% at G=100 without external calibration. |
| Reference-pin level shifting | Allows output to be centered at any DC voltage (e.g., 1.65 V for 3.3 V ADCs), eliminating AC-coupling capacitors. |
| High input impedance (≥1 GΩ) | Minimizes loading error on high-Z sources like piezoelectric sensors and pH electrodes. |
| Input overvoltage protection | Internal diodes clamp inputs to within 0.7 V of V+ or V–, permitting direct connection to ±15 V analog backplanes. |
Applications
| ECG Signal Conditioning | Industrial Flow Transmitter |
|---|---|
|
Use Scenario: Amplifying microvolt-level differential cardiac signals from dry electrodes in portable patient monitors. IC Role / Device Role / Timing Role: Precision instrumentation amplifier providing 500× gain, 60 Hz notch rejection via CMRR, and rail-to-rail output swing into 12-bit SAR ADC. Use Value: 35 nV/√Hz noise floor and 250 µV offset ensure ≥90 dB SNR for P-wave detection without post-processing averaging. |
Use Scenario: Converting millivolt outputs from electromagnetic flow sensors in water/wastewater treatment plants. IC Role / Device Role / Timing Role: Low-drift IA rejecting common-mode noise from 4–20 mA loop coupling and motor drives while delivering stable 0–5 V output. Use Value: 3 µV/°C offset drift prevents >1% full-scale error over 40°C ambient variation - eliminating field recalibration. |
| Multiparameter Patient Monitor | AC Charging Station Sensor Interface |
|
Use Scenario: Simultaneous acquisition of ECG, respiration, and temperature signals on shared analog front-end PCB. IC Role / Device Role / Timing Role: Single-channel IA handling high-impedance biopotential inputs with independent REF pin control per channel. Use Value: VSSOP-8 footprint and 175 µA current allow integration of 4+ IAs on compact medical PCB without thermal derating. |
Use Scenario: Isolating and scaling shunt-based current measurements in EV charging pile power stages. IC Role / Device Role / Timing Role: High-CMRR IA rejecting ground-bounce noise from IGBT switching while maintaining <100 ns propagation delay. Use Value: ±18 V supply tolerance permits direct interface with 15 V isolated DC/DC rails - avoiding extra level-shift circuitry. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar instrumentation amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD8221ARMZ | Higher quiescent current (1.1 mA), lower noise (27 nV/√Hz), SOIC-8 only | Better for high-speed, low-noise lab equipment; not suitable for multi-year battery life | Select AD8221ARMZ when bandwidth >1 MHz and noise <30 nV/√Hz are mandatory; avoid for portable devices. |
| INA333AIDR | Lower IQ (50 µA), same VSSOP-8 package, but max gain = 1000× and 100 µV offset | Optimized for ultra-low-power IoT sensors; limited gain range restricts high-precision bridge applications | Choose INA333AIDR for sub-100 µA systems where 1000× gain suffices; INA126E/2K5 preferred when 10,000× gain needed. |
Compared with AD8221ARMZ and INA333AIDR, the INA126E/2K5 uniquely balances ultra-low power (175 µA), wide gain range (5–10,000×), and industrial temperature rating in a space-saving VSSOP-8 - making it the only option meeting all three requirements simultaneously for portable medical and industrial DAQ.
Availability
INA126E/2K5 is available at Aetrix Electronics and suitable for ECG monitoring, flow transmitter design, multiparameter patient monitors, and AC charging station sensor interfaces requiring stable component supply across extended production lifecycles.
Supply support for INA126E/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 heritage in precision signal chain components.
The INA126E/2K5 belongs to TI's INAx126 micropower instrumentation amplifier family, engineered specifically for accurate, low-noise differential signal acquisition in portable, battery-operated, and space-constrained industrial measurement systems.
FAQ
What is the maximum gain achievable with the INA126E/2K5, and how is it set?
The INA126E/2K5 supports a maximum gain of 10,000×, set by connecting an external resistor (RG) between pins 1 and 8 using the formula G = 5 + 80 kΩ/RG. For G = 10,000, RG = 8.0 Ω (7.87 Ω standard value). At this gain, layout parasitics and resistor tolerance become critical - TI recommends using 0.1% metal-film resistors and Kelvin connections to minimize error. The INA126E/2K5 maintains specified performance up to this gain limit.
Does the INA126E/2K5 require external trimming for offset voltage in typical applications?
No, the INA126E/2K5 does not require external offset trimming in most applications due to its guaranteed maximum offset voltage of 250 µV and drift of 3 µV/°C. These specifications ensure ≤0.25% gain error at 100× gain over the full –40°C to +85°C range. Only high-precision applications demanding <50 µV total offset (e.g., laboratory-grade weigh scales) should consider optional trimming via the REF pin using a buffered voltage source, as shown in TI's SBOS062D Figure 7-2.
Can the INA126E/2K5 operate from a single 3.3V supply, and what are the REF pin requirements?
Yes, the INA126E/2K5 operates from a single 3.3V supply (2.7V–36V range). The REF pin must be driven by a low-impedance source - ideally ≤8 Ω - to preserve CMRR; exceeding this impedance degrades CMRR to ~80 dB. For 3.3V systems, tie REF to 1.65V (mid-supply) using a precision voltage divider buffered by an op-amp (e.g., OPA333) to maintain linearity and prevent output saturation. TI confirms this configuration in SBOS062D Section 6.4.1 and Figure 7-1.
What is the purpose of the Sense pin in the INA126E/2K5, and is it present on this device?
The INA126E/2K5 does not have a Sense pin. SenseA and SenseB terminals exist only on the dual-channel INA2126 variant (pins 7 and 10) to enable remote-sense feedback for improved load regulation. The INA126E/2K5 is a single-channel device with no Sense functionality - its output (pin 6) connects directly to the load. This distinction is clearly documented in TI's SBOS062D Tables 4-1 and 4-2, where Sense pins appear exclusively in the INA2126 pinout.
How does the VSSOP-8 package of the INA126E/2K5 impact thermal performance compared to SOIC-8?
The VSSOP-8 package of the INA126E/2K5 has a higher junction-to-ambient thermal resistance (167.8 °C/W) than SOIC-8 (116.4 °C/W), meaning it runs hotter at the same power dissipation. However, its ultra-low 175 µA quiescent current limits power dissipation to <2.7 mW (at ±15 V), resulting in negligible self-heating (<0.5 °C rise) even in sealed enclosures. TI's thermal data in SBOS062D Section 5.4 confirms VSSOP-8 is fully rated for –40°C to +85°C operation without derating.
INA126E/2K5 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- Instrumentation
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 0.4V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 200 kHz
- Current - Input Bias:
- 10 nA
- Voltage - Input Offset:
- 100 µV
- Current - Supply:
- 175µA
- 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:
- 8-VSSOP
INA126E/2K5 FAQ
1.How can I place an order for INA126E/2K5 through Aetrix?
Please submit a Request for Quotation (RFQ) for INA126E/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 INA126E/2K5 reliable?
The price and inventory of INA126E/2K5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA126E/2K5 is usually 5 days.
3.What payment methods are accepted for INA126E/2K5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA126E/2K5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA126E/2K5?
INA126E/2K5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA126E/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 INA126E/2K5?
For technical support, including INA126E/2K5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA126E/2K5 requirements.
6.How does Aetrix verify that INA126E/2K5 is sourced from the original manufacturer or authorized distributors?
All INA126E/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 INA126E/2K5 meets industry standards.
7.What is the process for return or replacement of INA126E/2K5?
All INA126E/2K5 units undergo pre-shipment inspection (PSI). If there is an issue with INA126E/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 INA126E/2K5 part is unused and in its original packaging.
Return procedure for INA126E/2K5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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