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Texas Instruments INA129UA/2K5E4
- Part No.:
- INA129UA/2K5E4
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
INA129UA/2K5E4.pdf
- Description:
- IC INST AMP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,164
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Product details
Overview
INA129UA/2K5E4 from Texas Instruments is a precision, low-power instrumentation amplifier optimized for high-accuracy differential signal conditioning in noisy industrial environments. It delivers 50 μV max offset voltage, 0.5 μV/°C max drift, 120 dB min CMRR at G = 100, 1.3 MHz bandwidth (G = 1), and ±40 V input overvoltage protection - enabling reliable operation in pressure transmitters and ECG front-ends.
For engineers reviewing the INA129UA/2K5E4 datasheet, INA129UA/2K5E4 pinout, INA129UA/2K5E4 application, or INA129UA/2K5E4 equivalent, key selection criteria include gain-setting resistor compatibility (49.4 kΩ nominal), SOIC-8 package thermal performance (RθJA = 110 °C/W), dual-supply operation (±2.25 V to ±18 V), and CSO: FRE input bias current (0.7 nA max).
Technical Context
The INA129UA/2K5E4 implements a three-op-amp architecture with current-feedback input stages, enabling 200 kHz bandwidth at G = 100 while maintaining low noise (8 nV/√Hz) and high open-loop gain. Its laser-trimmed thin-film resistors ensure stable gain accuracy and low drift across temperature.
Input overvoltage protection circuitry clamps ±40 V faults without damage, and the REF pin allows output level shifting relative to system ground or other reference voltages - critical for interfacing with ADCs operating on different supply domains.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Offset voltage | 50 μV maximum - ensures ≤0.5 mV error at G = 10 when measuring 10 mV sensor signals |
| CMRR | 120 dB minimum at G = 100 - rejects >1 V common-mode interference while amplifying 10 mV differential inputs |
| Bandwidth | 1.3 MHz at G = 1 - supports DC–100 kHz measurement bandwidths after gain-dependent roll-off |
| Input bias current | 0.7 nA maximum (CSO: FRE) - enables use with high-impedance pH or thermocouple sensors without significant loading error |
| Supply range | ±2.25 V to ±18 V - operates from low-voltage battery systems (±2.5 V) up to industrial ±15 V rails |
| Quiescent current | 700 μA - allows continuous operation in power-constrained portable DAQ systems |
| Input protection | ±40 V fault tolerance - eliminates need for external series resistors or TVS diodes in harsh industrial I/O modules |
Pinout & Package
INA129UA/2K5E4 is housed in an 8-pin SOIC (D) package, 4.9 mm × 6 mm body size, with standard JEDEC MS-012AC footprint and 1.27 mm lead pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RG (Gain resistor terminal) | Connects to external resistor top; sets gain per G = 1 + 49.4 kΩ/RG |
| 2 | VIN− | Inverting input; high-impedance node (100 GΩ || 9 pF) for differential sensing |
| 3 | VIN+ | Non-inverting input; matched to VIN− for optimal CMRR |
| 4 | V− | Negative supply rail; must be decoupled locally for noise immunity |
| 5 | REF | Output reference; drives output offset - must be low-impedance (≤8 Ω) to preserve CMRR |
| 6 | VO | Differential output; swing limited to (V−)+0.15 V to (V+)-0.15 V (CSO: FRE) |
| 7 | V+ | Positive supply rail; requires local 0.1 μF ceramic decoupling |
| 8 | RG (Gain resistor terminal) | Connects to external resistor bottom; completes gain-setting network |
Key Features
| Feature | Design Value |
|---|---|
| Laser-trimmed gain equation | G = 1 + 49.4 kΩ/RG enables drop-in replacement of legacy instrumentation amps requiring 49.4 kΩ scaling |
| Low-frequency noise | 0.2 μVPP (0.1–10 Hz) - supports high-resolution DC-coupled measurements in weigh scales and strain gauges |
| Input overvoltage protection | ±40 V fault tolerance without latch-up - simplifies front-end design in industrial analog input modules |
| Wide common-mode range | (V−)+2 V to (V+)-2 V at VO = 0 V - accommodates sensor outputs near supply rails in single-supply configurations |
| Thermal stability | 0.5 μV/°C max VOS drift - maintains calibration integrity across −40°C to +85°C operating range |
Applications
| Pressure Transmitter | Electrocardiogram (ECG) |
|---|---|
Use Scenario: Amplifies mV-level bridge output from piezoresistive pressure sensors in HVAC and process control systems. IC Role / Device Role / Timing Role: Precision instrumentation amplifier providing programmable gain (1–1000), high CMRR, and rail-to-rail input common-mode range. Use Value: Enables direct interface to 3.3 V or 5 V SAR ADCs with <0.1% gain error and no external protection components required. |
Use Scenario: Front-end amplification of microvolt-level biopotential signals from electrode pairs in portable ECG monitors. IC Role / Device Role / Timing Role: Low-noise, low-drift differential amplifier rejecting 50/60 Hz mains interference via high CMRR. Use Value: Delivers 0.2 μVPP low-frequency noise and ±40 V patient isolation margin - meeting IEC 60601-1 safety requirements. |
| Weigh Scale | Analog Input Module |
Use Scenario: Conditioned output from load cell bridges in industrial weighing terminals and checkweighers. IC Role / Device Role / Timing Role: High-input-impedance instrumentation amplifier with 50 μV max offset for sub-gram resolution. Use Value: Maintains linearity (±0.0005% FSR at G = 100) and long-term stability (±0.2 μV/mo) across temperature cycles. |
Use Scenario: Signal conditioning stage in modular PLC analog input cards accepting 4–20 mA, ±10 V, or thermocouple inputs. IC Role / Device Role / Timing Role: Programmable-gain amplifier supporting multiple sensor types via configurable RG networks. Use Value: Single-component solution for 16-bit+ data acquisition with ±2.25 V to ±18 V supply flexibility and robust EMC performance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar instrumentation amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA128UA/2K5 | Uses 50 kΩ gain equation (G = 1 + 50 kΩ/RG) instead of 49.4 kΩ; otherwise identical specs and pinout | Preferred where legacy designs specify 50 kΩ scaling or require industry-standard gain equation | Select INA128UA/2K5 for drop-in compatibility with existing 50 kΩ-based layouts; verify gain tolerance impact for precision calibrations |
| INA828IDR | Lower input bias current (0.6 nA max vs. 0.7 nA), lower noise (7 nV/√Hz), same quiescent current and SOIC-8 package | Better suited for ultra-high-impedance sources (e.g., glass pH electrodes) and low-noise DAQ requiring <7 nV/√Hz | Choose INA828IDR when upgrading for improved noise or bias current performance; note identical pinout but different gain equation (G = 1 + 50 kΩ/RG) |
Compared with INA128UA/2K5, the INA129UA/2K5E4 provides tighter gain-scaling alignment for legacy replacements, while INA828IDR offers measurable noise and bias current improvements - making it ideal for next-generation high-fidelity sensor interfaces without PCB redesign.
Availability
INA129UA/2K5E4 is available at Aetrix Electronics and suitable for pressure transmitter design, ECG front-end development, and industrial analog input module production requiring stable component supply and full traceability.
Supply support for INA129UA/2K5E4 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 delivering analog, embedded processing, and connectivity solutions for industrial, automotive, and communications markets.
The INA12x family was designed specifically for precision DC-coupled measurement applications demanding low offset, low drift, and high CMRR - targeting industrial process control, medical instrumentation, and test equipment.
FAQ
What is the gain-setting resistor value for G = 100 on the INA129UA/2K5E4?
The INA129UA/2K5E4 uses the gain equation G = 1 + 49.4 kΩ/RG. For G = 100, RG = 49.4 kΩ / 99 ≈ 499 Ω. A 1% metal-film resistor of 499 Ω achieves nominal gain with ≤0.25% error. The INA129UA/2K5E4 datasheet Table 8-1 lists 499 Ω as the nearest standard value for G = 100.
Does the INA129UA/2K5E4 support single-supply operation?
Yes, the INA129UA/2K5E4 supports single-supply operation from 4.5 V to 36 V. When operated from a single 5 V or 12 V rail, the input common-mode range extends from (V−)+2 V to (V+)-2 V, and the REF pin must be biased to mid-supply (e.g., 2.5 V) to center the output swing. The INA129UA/2K5E4 maintains full functionality including ±40 V input protection in this mode.
What is the maximum capacitive load the INA129UA/2K5E4 can drive stably?
The INA129UA/2K5E4 is specified for stable operation with up to 1000 pF load capacitance. Driving larger capacitive loads (e.g., long cables or ADC input capacitance >1 nF) may cause peaking or oscillation. For loads exceeding 1000 pF, a series isolation resistor (10–100 Ω) between VO and the load restores stability without degrading DC accuracy. This behavior is confirmed in the INA129UA/2K5E4 Electrical Characteristics table (Section 6.5).
How does chip site origin (CSO) affect the INA129UA/2K5E4 specifications?
The INA129UA/2K5E4 is manufactured across two qualified chip sites: SHE and FRE. CSO: FRE guarantees lower input bias current (0.7 nA max vs. 5 nA for SHE) and tighter output swing (±0.15 V from rails vs. ±1.4 V). All electrical specs in the official INA129UA/2K5E4 datasheet are guaranteed for CSO: FRE, which is the variant shipped under the /2K5E4 suffix. Designers should rely on FRE-labeled limits for worst-case analysis.
Can the INA129UA/2K5E4 replace the INA128UA/2K5 in an existing design?
The INA129UA/2K5E4 is pin-compatible with the INA128UA/2K5 and shares identical package, pinout, and absolute maximum ratings. However, its gain equation uses 49.4 kΩ instead of 50 kΩ, resulting in ~1.2% lower gain for the same RG. To maintain identical gain, reduce RG by 1.2% (e.g., 49.4 kΩ → 48.8 kΩ). The INA129UA/2K5E4 also offers improved CSO: FRE performance for bias current and output swing.
INA129UA/2K5E4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Amplifier Type:
- Instrumentation
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 4V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 1.3 MHz
- Current - Input Bias:
- 2 nA
- Voltage - Input Offset:
- 25 µV
- Current - Supply:
- 700µA
- Current - Output / Channel:
- 15 mA
- Voltage - Supply Span (Min):
- 4.5 V
- Voltage - Supply Span (Max):
- 36 V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
INA129UA/2K5E4 FAQ
1.How can I place an order for INA129UA/2K5E4 through Aetrix?
Please submit a Request for Quotation (RFQ) for INA129UA/2K5E4 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 INA129UA/2K5E4 reliable?
The price and inventory of INA129UA/2K5E4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA129UA/2K5E4 is usually 5 days.
3.What payment methods are accepted for INA129UA/2K5E4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA129UA/2K5E4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA129UA/2K5E4?
INA129UA/2K5E4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA129UA/2K5E4 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 INA129UA/2K5E4?
For technical support, including INA129UA/2K5E4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA129UA/2K5E4 requirements.
6.How does Aetrix verify that INA129UA/2K5E4 is sourced from the original manufacturer or authorized distributors?
All INA129UA/2K5E4 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 INA129UA/2K5E4 meets industry standards.
7.What is the process for return or replacement of INA129UA/2K5E4?
All INA129UA/2K5E4 units undergo pre-shipment inspection (PSI). If there is an issue with INA129UA/2K5E4, 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 INA129UA/2K5E4 part is unused and in its original packaging.
Return procedure for INA129UA/2K5E4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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