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Texas Instruments INA2126EA/250G4
- Part No.:
- INA2126EA/250G4
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
INA2126EA/250G4.pdf
- Description:
- IC INST AMP 2 CIRCUIT 16SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,968
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Product details
Overview
INA2126EA/250G4 from Texas Instruments is a dual-channel, micropower instrumentation amplifier optimized for precision DC-coupled sensor signal conditioning in low-power industrial and medical systems. It delivers 250 μV max input offset voltage, 3 μV/°C max drift, 35 nV/√Hz voltage noise, ±1.35V to ±18V dual-supply operation, and gain programmable from 5 to 10,000 V/V via a single external resistor - enabling high-accuracy current/voltage sensing in battery-powered ECG monitors and flow transmitters.
For engineers reviewing the INA2126EA/250G4 datasheet, INA2126EA/250G4 pinout, INA2126EA/250G4 application, or INA2126EA/250G4 equivalent, key selection considerations 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 verified operation across –40°C to +85°C industrial temperature range.
Technical Context
The INA2126EA/250G4 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/10 kΩ resistor network enables precise gain setting with minimal external components.
Each channel features independent gain-setting pins (RGA for Channel A, RGB for Channel B), dedicated sense feedback inputs (SenseA/SenseB), and reference inputs (RefA/RefB) - supporting accurate remote-sensing configurations and independent level-shifting of each output without cross-channel interaction.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Channels | Dual - enables simultaneous differential measurement of two independent sensor signals on one IC. |
| Gain Range | 5–10,000 V/V - set by single external resistor; supports wide dynamic range without changing IC. |
| Input Offset Voltage | ±250 μV max - ensures ≤0.025% error at 1 V full-scale output before trimming. |
| Quiescent Current | ±175 μA per channel - enables >1-year battery life in portable diagnostic devices drawing <350 μA total. |
| CMRR | 94 dB min at G=5 - rejects ≥99.998% of 60 Hz mains interference in ECG electrode interfaces. |
| Bandwidth | 200 kHz at G=5 - supports accurate acquisition of fast transients in infusion pump motor current monitoring. |
| Supply Range | ±1.35V to ±18V - operates from single 3.3 V rail (with REF biasing) or ±15 V lab-grade supplies. |
Pinout & Package
INA2126EA/250G4 is housed in a 16-pin SSOP (DBQ) package with 0.65 mm lead 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 for Channel A - must be driven differentially with V+INA; high-impedance node requiring bias return path. |
| 2 | V+INA | Positive input for Channel A - forms differential pair with V–INA; matched input structure enables CMRR >90 dB. |
| 3,4 | RGA | Channel A gain-setting terminals - connect external resistor between pins 3 and 4 to set gain per G = 5 + 80 kΩ/RG. |
| 5 | RefA | Channel A output reference - sets DC level of VOA; must be driven low-impedance (≤8 Ω) to preserve CMRR. |
| 6 | VOA | Channel A output - connects to SenseA (pin 7) for remote-sensing accuracy; drives 25 kΩ load minimum. |
| 7 | SenseA | Channel A output feedback - ties directly to VOA to close local loop; required for specified accuracy and stability. |
| 8 | V– | Negative supply rail - shared by both channels; decoupling capacitor required within 10 mm of pin. |
| 9 | V+ | Positive supply rail - shared by both channels; same decoupling requirement as V–. |
| 10 | SenseB | Channel B output feedback - ties directly to VOB; identical function and routing rules as SenseA. |
| 11 | VOB | Channel B output - connects to SenseB (pin 10); electrically isolated from Channel A except via shared supplies. |
| 12 | RefB | Channel B output reference - independently configurable from RefA; enables dual-level-shifted outputs. |
| 13,14 | RGB | Channel B gain-setting terminals - independent of RGA; allows different gains per channel without external op amps. |
| 15 | V+INB | Positive input for Channel B - fully isolated input stage; no shared bias or signal paths with Channel A. |
| 16 | V–INB | Negative input for Channel B - completes differential pair for Channel B; identical specs and layout rules as V–INA. |
Key Features
| Feature | Design Value |
|---|---|
| Two-op-amp architecture | Reduces quiescent current by ~30% vs. three-op-amp IAs while preserving gain accuracy and CMRR. |
| Independent channel gain control | Pins 3/4 (RGA) and 13/14 (RGB) allow mismatched gains (e.g., 100× on Channel A, 1000× on Channel B) without external circuitry. |
| Dedicated sense feedback | SenseA (pin 7) and SenseB (pin 10) enable Kelvin-sensing at load to eliminate PCB trace resistance errors. |
| Low-noise, low-drift design | 35 nV/√Hz noise + 3 μV/°C drift ensures stable baseline in long-duration patient monitoring applications. |
| Wide supply flexibility | Operates from ±1.35V up to ±18V or single 2.7–36V rail - supports both ultra-low-power wearables and industrial PLC analog inputs. |
Applications
| ECG Electrode Interface | Industrial Flow Transmitter |
|---|---|
Use Scenario: Amplifying microvolt-level differential signals from Ag/AgCl electrodes while rejecting 60 Hz mains interference and motion artifacts. IC Role / Device Role / Timing Role: Dual-channel IA acquires Lead I and Lead II simultaneously; each channel conditions one limb-pair signal with independent gain and reference. Use Value: 94 dB CMRR and 130 dB channel separation prevent crosstalk between leads; 175 μA/channel current extends battery life in portable Holter recorders. |
Use Scenario: Converting 4–20 mA loop current from magnetic flow sensors into calibrated voltage for ADC digitization in hazardous-area field instruments. IC Role / Device Role / Timing Role: Channel A measures sensor bridge output; Channel B monitors loop supply voltage for diagnostics and compensation. Use Value: Independent RefA/RefB pins allow Channel A to output 0–5 V referenced to system ground while Channel B outputs supply-rail voltage for real-time health monitoring. |
| Multiparameter Patient Monitor | AC Charging Station Sensor Hub |
Use Scenario: Simultaneous acquisition of ECG, respiration (via impedance pneumography), and temperature (via thermistor bridge) in compact bedside units. IC Role / Device Role / Timing Role: Single INA2126EA/250G4 replaces two discrete IAs - one for ECG, one for respiration - reducing BOM count and board area. Use Value: Matched gain drift (<±10 ppm/°C at G=5) ensures consistent calibration across temperature; SSOP-16 footprint fits tight 10 mm × 10 mm sensor modules. |
Use Scenario: Monitoring isolation resistance and leakage current between EV battery pack and chassis in IEC 61851-compliant AC charging stations. IC Role / Device Role / Timing Role: Channel A measures high-impedance insulation test voltage; Channel B conditions shunt-based leakage current signal with 1000× gain. Use Value: Guaranteed 250 μV max offset ensures <0.1% error in 100 MΩ isolation measurements; ±18V supply tolerance accommodates transient overvoltages during plug/unplug events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar instrumentation amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA2128EA/250G4 | Same dual-channel IA architecture but with 100 μV max offset and 1 μV/°C drift - tighter initial accuracy and lower drift. | Better suited for high-precision weigh scales or laboratory analyzers where sub-0.01% linearity is mandatory. | Select INA2128EA/250G4 only if offset/drift budget requires improvement beyond INA2126EA/250G4's 250 μV/3 μV/°C spec. |
| AD8422ARZ | Single-channel, 3-op-amp IA with 25 μV max offset, 0.3 μV/°C drift, and 10 MHz bandwidth - higher precision and speed but higher 1.2 mA quiescent current. | Preferred for high-speed data acquisition or RF-sensitive environments where 10 MHz GBW and superior PSRR are critical. | Choose AD8422ARZ when bandwidth >200 kHz or offset <100 μV is required; accept 7× higher power draw and single-channel limitation. |
Compared with INA2126EA/250G4, INA2128EA/250G4 improves offset and drift at identical power and package, while AD8422ARZ trades 7× higher current for 50× more bandwidth and 10× better offset - making INA2126EA/250G4 optimal for cost- and power-constrained dual-sensor systems needing robust 200 kHz performance.
Availability
INA2126EA/250G4 is available at Aetrix Electronics and suitable for ECG monitor production, industrial flow transmitter manufacturing, and AC charging station sensor hub development requiring stable component supply and long-term lifecycle support.
Supply support for INA2126EA/250G4 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, medical, and automotive markets.
The INAx126 product line was designed specifically for low-power, high-accuracy sensor signal conditioning in portable and battery-operated instrumentation - emphasizing micropower operation, wide supply flexibility, and ease of gain configuration.
FAQ
What is the maximum gain achievable with INA2126EA/250G4, and how is it set?
The INA2126EA/250G4 supports gains from 5 V/V to 10,000 V/V using an external resistor connected between its dedicated gain-setting pins: RGA (pins 3–4) for Channel A and RGB (pins 13–14) for Channel B. The gain equation is G = 5 + 80 kΩ/RG. For 10,000 V/V, a 7.87 Ω resistor is required - necessitating careful layout to minimize parasitic resistance. The INA2126EA/250G4 datasheet provides a table of standard 1% resistor values for common gains.
Does INA2126EA/250G4 require external components for basic operation?
Yes - the INA2126EA/250G4 requires at minimum: (1) decoupling capacitors (0.1 μF ceramic) on V+ and V– pins, (2) low-impedance connections to RefA and RefB (≤8 Ω series resistance), and (3) external gain resistors if gain >5. SenseA and SenseB must be shorted to VOA and VOB respectively for specified accuracy. No external compensation or trimming is needed for typical applications due to its laser-trimmed internal resistors and low 250 μV offset.
How does the SSOP-16 package of INA2126EA/250G4 impact thermal performance?
The INA2126EA/250G4 in SSOP-16 (DBQ) has a junction-to-ambient thermal resistance (RθJA) of 115.8 °C/W under JEDEC JESD51-7 conditions. This is higher than SOIC-16 (76.2 °C/W) but acceptable for low-power operation: at 350 μA total quiescent current and ±15 V supply, power dissipation is ~10.5 mW, resulting in <1.2°C junction rise above ambient - well within the –40°C to +85°C operating range. Thermal pad soldering further improves performance.
Can INA2126EA/250G4 operate from a single 3.3V supply?
Yes - the INA2126EA/250G4 supports single-supply operation from 2.7 V to 36 V. For 3.3 V, connect RefA and RefB to 1.65 V (mid-supply) using a low-impedance divider or buffer to maintain linear output swing. Input common-mode range becomes limited (±0.5 V around mid-supply), and output swing reduces to ~0.75 V below V+ and ~0.95 V above V–. The INA2126EA/250G4 maintains full functionality including gain accuracy and CMRR in this configuration.
What is the purpose of SenseA and SenseB pins on INA2126EA/250G4?
SenseA (pin 7) and SenseB (pin 10) are dedicated feedback inputs that must be connected directly to VOA (pin 6) and VOB (pin 11), respectively. They close the internal amplifier's feedback loop at the load rather than at the IC output pin - enabling remote-sensing to cancel voltage drops across PCB traces or connectors. This preserves gain accuracy and linearity when driving long cables or high-current loads, a capability not present in single-amplifier or basic instrumentation amplifiers.
INA2126EA/250G4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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/250G4 FAQ
1.How can I place an order for INA2126EA/250G4 through Aetrix?
Please submit a Request for Quotation (RFQ) for INA2126EA/250G4 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/250G4 reliable?
The price and inventory of INA2126EA/250G4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA2126EA/250G4 is usually 5 days.
3.What payment methods are accepted for INA2126EA/250G4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA2126EA/250G4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA2126EA/250G4?
INA2126EA/250G4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA2126EA/250G4 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/250G4?
For technical support, including INA2126EA/250G4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA2126EA/250G4 requirements.
6.How does Aetrix verify that INA2126EA/250G4 is sourced from the original manufacturer or authorized distributors?
All INA2126EA/250G4 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/250G4 meets industry standards.
7.What is the process for return or replacement of INA2126EA/250G4?
All INA2126EA/250G4 units undergo pre-shipment inspection (PSI). If there is an issue with INA2126EA/250G4, 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/250G4 part is unused and in its original packaging.
Return procedure for INA2126EA/250G4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
INA2126EA/250G4 Tags
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