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Texas Instruments INA2126PA
- Part No.:
- INA2126PA
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 16-DIP (0.300", 7.62mm)
- Datasheet:
-
INA2126PA.pdf
- Description:
- IC INST AMP 2 CIRCUIT 16DIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,081
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Product details
Overview
INA2126PA from Texas Instruments is a dual-channel, micropower instrumentation amplifier optimized for precision low-level differential signal acquisition in portable and industrial systems. It delivers 175μA/channel quiescent current, ±1.35V to ±18V dual-supply operation, 250μV max offset voltage, 3μV/°C max drift, and 35nV/√Hz input voltage noise - enabling high-accuracy sensor interfacing in battery-powered ECG monitors and flow transmitters.
For engineers reviewing the INA2126PA datasheet, INA2126PA pinout, INA2126PA application, or INA2126PA equivalent, this page provides verified package mapping (16-pin PDIP), confirmed dual-amplifier topology with independent Sense/Ref pins per channel, gain-setting equation G = 5 + 80kΩ/RG, and validated alternatives for dual-channel IA replacement in medical and industrial analog front-ends.
Technical Context
The INA2126PA implements a two-op-amp instrumentation amplifier architecture that reduces power versus traditional three-op-amp designs while maintaining high common-mode rejection and balanced input impedance. Its internal laser-trimmed 40kΩ/10kΩ resistor network enables precise gain setting via a single external RG resistor.
Each channel features dedicated SenseA/SenseB feedback terminals for load-referred output correction, independent RefA/RefB reference inputs for level-shifting, and separate V–INA/V+INA and V–INB/V+INB differential inputs - supporting simultaneous, isolated amplification of two sensor signals without crosstalk below 10kHz at G=100.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Channels | Dual independent instrumentation amplifiers with fully separated bias networks and feedback paths. |
| Supply Range | ±1.35V to ±18V dual supply (or 2.7V–36V single supply); supports low-voltage portable designs and high-voltage industrial sensors. |
| Quiescent Current | 175μA per channel; enables >1-year battery life in continuous-monitoring devices like infusion pumps. |
| Offset Voltage | ±250μV maximum (RTI); ensures <0.1% gain error at G=100 for 25mV full-scale sensor outputs. |
| Gain Range | 5V/V to 10,000V/V set by single external resistor RG; enables flexible scaling from millivolt thermocouples to microvolt strain gauges. |
| CMRR | 74dB minimum at G=5 (INA2126PA grade); sufficient for 60Hz line-noise rejection in ECG front-ends with proper PCB layout. |
| Bandwidth | 200kHz at G=5 (SHE chip site); supports dynamic measurements up to 20kHz with ≤1% gain error. |
Pinout & Package
INA2126PA is packaged in a 16-pin plastic dual in-line package (PDIP, N suffix), 0.300-inch wide body, with through-hole mounting and industry-standard pin spacing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | V–INA | Negative input for Channel A; requires matched source impedance to V+INA for optimal CMR. |
| 2 | V+INA | Positive input for Channel A; differential pair with Pin 1 forms high-Z, balanced sensor interface. |
| 3, 4 | RGA | Gain-setting node for Channel A; connect external resistor between Pins 3 and 4 to set G = 5 + 80kΩ/RG. |
| 5 | RefA | Reference input for Channel A; must be driven low-impedance (≤8Ω) to maintain >74dB CMRR. |
| 6 | VOA | Output of Channel A; connects to SenseA (Pin 7) for load-sensing accuracy. |
| 7 | SenseA | Feedback sense for Channel A; tie directly to VOA (Pin 6) unless remote load sensing is required. |
| 8 | V– | Negative supply rail; decouple with 0.1μF ceramic capacitor close to Pin 8. |
| 9 | V+ | Positive supply rail; decouple with 0.1μF ceramic capacitor close to Pin 9. |
| 10 | SenseB | Feedback sense for Channel B; tie directly to VOB (Pin 11) unless remote load sensing is required. |
| 11 | VOB | Output of Channel B; connects to SenseB (Pin 10) for load-sensing accuracy. |
| 12 | RefB | Reference input for Channel B; independent of RefA; requires same low-impedance drive as RefA. |
| 13, 14 | RGB | Gain-setting node for Channel B; connect external resistor between Pins 13 and 14 to set G = 5 + 80kΩ/RG. |
| 15 | V+INB | Positive input for Channel B; differential pair with Pin 16 forms second independent sensor interface. |
| 16 | V–INB | Negative input for Channel B; requires matched source impedance to V+INB for optimal CMR. |
Key Features
| Feature | Design Value |
|---|---|
| Two-op-amp topology | Reduces quiescent current by ~30% vs. three-op-amp IAs while preserving >74dB CMRR at G=5. |
| Independent Sense/Ref per channel | Enables true load-referred output correction for each amplifier, critical for remote sensor conditioning. |
| Laser-trimmed internal resistors | 40kΩ/10kΩ network guarantees gain accuracy within ±0.18% at G=5 and ±1% at G=100 (INA2126PA grade). |
| Low input bias current | ±25nA maximum allows direct connection to high-impedance sources (e.g., pH electrodes, piezoelectric sensors) without significant error. |
| Wide common-mode range | Supports inputs from (V–) – 0.5V to (V+) + 0.5V at RS = 0Ω, enabling use with bridge sensors operating near supply rails. |
Applications
| ECG Signal Conditioning | Industrial Flow Transmitter |
|---|---|
|
Use Scenario: Amplifying microvolt-level differential cardiac signals from Ag/AgCl electrodes in presence of 1Vpp 50/60Hz common-mode interference. IC Role / Device Role / Timing Role: Dual-channel IA acquiring lead-I and lead-II ECG waveforms simultaneously with independent gain and reference control. Use Value: 74dB min CMRR and 35nV/√Hz noise enable clean R-wave detection without notch filtering; 175μA/channel extends battery life in portable monitors. |
Use Scenario: Converting millivolt outputs from electromagnetic flow meters into calibrated 4–20mA loop signals. IC Role / Device Role / Timing Role: Primary signal conditioner converting raw sensor differential voltage to stable, temperature-compensated analog output. Use Value: ±250μV offset and ±3μV/°C drift ensure <0.25%FS error over –40°C to +85°C; dual channels support redundant measurement or multi-parameter output. |
| Multiparameter Patient Monitor | AC Charging Station Sensor Interface |
|
Use Scenario: Simultaneous acquisition of ECG, respiration (impedance pneumography), and temperature (thermistor bridge) signals on shared PCB. IC Role / Device Role / Timing Role: Dual IA providing isolated, low-noise front-end for two independent analog sensor domains with shared supply rails. Use Value: Independent RefA/RefB pins allow separate level-shifting for biopotential (0V ref) and bridge (mid-rail ref) signals; 16-pin PDIP simplifies manual assembly and rework. |
Use Scenario: Monitoring isolation resistance and DC bus voltage in EV charging infrastructure per IEC 62955 and UL 2231 standards. IC Role / Device Role / Timing Role: High-accuracy differential amplifier measuring leakage current across HV insulation barriers and shunt-based DC link monitoring. Use Value: ±18V supply rating supports direct connection to 1000V+ DC systems via resistive dividers; 200kHz bandwidth captures fast fault transients during ground-fault events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel instrumentation amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA2128PA | Higher precision: ±100μV max offset, ±0.5μV/°C drift, but 225μA/channel IQ. | Better suited for laboratory-grade data acquisition where offset stability outweighs power budget. | Select INA2128PA when <0.05% gain error at G=1000 is required and 28% higher supply current is acceptable. |
| AD8226ARZ | Single-supply optimized (2.7V–36V), lower noise (20nV/√Hz), but only single-channel; requires two units for dual function. | Preferred for space-constrained single-channel designs with aggressive noise targets (e.g., portable ultrasound). | Choose AD8226ARZ when board area permits two SOIC-8 devices and single-supply operation dominates design requirements. |
Compared with INA2126PA, INA2128PA trades 50μA/channel extra current for 2× better offset stability, while AD8226ARZ offers lower noise and wider single-supply range but doubles component count and eliminates integrated dual-channel synchronization.
Availability
INA2126PA is available at Aetrix Electronics and suitable for ECG monitors, industrial flow transmitters, multiparameter patient monitors, and AC charging station sensor interfaces requiring stable component supply across extended product lifecycles.
Supply support for INA2126PA 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 company specializing in analog and embedded processing technologies, with leadership in precision amplifiers, data converters, and power management ICs.
The INAx126 product line was designed for low-power, high-accuracy sensor signal conditioning in portable medical, industrial process control, and test equipment - emphasizing micropower operation without sacrificing dc precision or noise performance.
FAQ
What is the maximum gain achievable with INA2126PA and how is it set?
The INA2126PA supports gains from 5V/V to 10,000V/V using the equation G = 5 + 80kΩ/RG. To achieve G = 10,000, a 7.87Ω resistor is placed between Pins 3–4 (Channel A) and Pins 13–14 (Channel B). The internal 80kΩ resistor is laser-trimmed for accuracy, and external RG tolerance directly impacts total gain error. For G ≥ 100, use 1% metal-film resistors and minimize parasitic trace resistance to avoid gain deviation.
Does INA2126PA require external components for basic operation?
Yes - the INA2126PA requires external gain-setting resistors (RG) between Pins 3–4 and Pins 13–14 for gains >5, plus 0.1μF decoupling capacitors on V+ (Pin 9) and V– (Pin 8). RefA (Pin 5) and RefB (Pin 12) must be driven by low-impedance sources (≤8Ω) - typically tied to ground or a precision reference. SenseA (Pin 7) and SenseB (Pin 10) should be shorted to VOA (Pin 6) and VOB (Pin 11) respectively unless remote sensing is needed.
How does the dual-channel architecture of INA2126PA prevent crosstalk between channels?
The INA2126PA uses completely independent bias networks, input stages, and feedback paths for each channel - eliminating dc coupling. At ac, channel separation is 130dB at dc and >80dB up to 10kHz (G=5), limited primarily by capacitive coupling on PCB. TI recommends separating input traces, using grounded guard rings, and balancing stray capacitance to ground - ensuring crosstalk remains below –80dB in properly laid-out industrial sensor modules using the INA2126PA.
Can INA2126PA operate from a single 5V supply?
Yes - the INA2126PA operates from 2.7V to 36V single supply. For 5V operation, connect RefA and RefB to 2.5V (midsupply), bias V+IN and V–IN within (V–) + 0.5V to (V+) – 0.5V, and verify output swing stays within 0.75V of rails. Input common-mode range shrinks at low supply; Figure 5-7 in the SBOS062D datasheet confirms linear operation with ±2.5V CMV at VS = +5V/0V. The INA2126PA's wide supply range makes it viable for both battery-powered and line-powered systems.
What is the thermal performance of INA2126PA in its PDIP package?
In the 16-pin PDIP (N) package, the INA2126PA has a junction-to-ambient thermal resistance (RθJA) of 39.3°C/W. At maximum rated quiescent current (200μA/channel × 2 = 400μA) and ±15V supply, power dissipation is ~12mW, resulting in <0.5°C junction rise above ambient - well within the –40°C to +85°C industrial temperature range. No heatsinking is required for typical operation, and the PDIP package supports manual soldering and socketing for prototyping with the INA2126PA.
INA2126PA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Amplifier Type:
- Instrumentation
- Number of Circuits:
- 2
- Output Type:
- -
- Slew Rate:
- 0.4V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 200 kHz
- Current - Input Bias:
- 50 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:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 16-PDIP
INA2126PA FAQ
1.How can I place an order for INA2126PA through Aetrix?
Please submit a Request for Quotation (RFQ) for INA2126PA 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 INA2126PA reliable?
The price and inventory of INA2126PA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA2126PA is usually 5 days.
3.What payment methods are accepted for INA2126PA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA2126PA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA2126PA?
INA2126PA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA2126PA 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 INA2126PA?
For technical support, including INA2126PA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA2126PA requirements.
6.How does Aetrix verify that INA2126PA is sourced from the original manufacturer or authorized distributors?
All INA2126PA 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 INA2126PA meets industry standards.
7.What is the process for return or replacement of INA2126PA?
All INA2126PA units undergo pre-shipment inspection (PSI). If there is an issue with INA2126PA, 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 INA2126PA part is unused and in its original packaging.
Return procedure for INA2126PA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
INA2126PA Tags
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LM358DT
STMicroelectronics
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LM358DR
Texas Instruments
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LM2904DR
Texas Instruments
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LM358ADR
Texas Instruments
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LM2904DGKR
Texas Instruments
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LM324DR
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MCP6006T-E/OT
Microchip Technology
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MCP6006UT-E/OT
Microchip Technology
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LM324PWR
Texas Instruments
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LM2902PWR
Texas Instruments
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LM2902DR
Texas Instruments
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LM358P
Texas Instruments
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