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Texas Instruments INA129UA/2K5G4
- Part No.:
- INA129UA/2K5G4
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
INA129UA/2K5G4.pdf
- Description:
- IC INST AMP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,335
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Product details
Overview
INA129UA/2K5G4 from Texas Instruments is a precision, low-power instrumentation amplifier designed for high-accuracy differential signal conditioning in noisy industrial and medical environments. It delivers 50 μV maximum offset voltage, 0.5 μV/°C maximum drift, 1.3 MHz bandwidth at G = 1, 120 dB minimum CMRR, and ±40 V input overvoltage protection - enabling robust front-end amplification in pressure transmitters and ECG systems.
For engineers reviewing the INA129UA/2K5G4 datasheet, INA129UA/2K5G4 pinout, INA129UA/2K5G4 application, or INA129UA/2K5G4 equivalent, key selection criteria include its 49.4 kΩ gain-setting resistor equation (enabling drop-in replacement of legacy devices), SOIC-8 package compatibility, ±2.25V to ±18V dual-supply operation, and confirmed performance across –40°C to +85°C.
Technical Context
The INA129UA/2K5G4 implements a three-op-amp topology with current-feedback input stages, delivering stable bandwidth up to 33 kHz at G = 1000 (CSO: FRE) and 20 kHz (CSO: SHE). Its laser-trimmed thin-film resistors ensure precise gain accuracy and low drift, while integrated overvoltage protection circuitry on both inputs sustains ±40 V common-mode excursions without damage.
It operates in a single functional mode requiring only dual supplies > ±2.25 V, with quiescent current fixed at ±700 μA. The reference (REF) pin enables output level shifting, and gain is set externally via RG between pins 1 and 8 - using the equation G = 1 + 49.4 kΩ/RG - distinguishing it from the INA128's 50 kΩ-based equation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Offset voltage | 50 μV max (RTI); ensures <0.05% error in 1 V full-scale measurements at room temperature |
| CMRR | 120 dB min at G = 100; rejects >99.9999% of 1 V common-mode interference |
| Bandwidth | 1.3 MHz at G = 1; supports fast transient capture in data acquisition systems |
| Input protection | ±40 V absolute max; eliminates need for external clamping diodes in sensor interfaces |
| Supply range | ±2.25V to ±18V; compatible with legacy ±5V, ±12V, and ±15V industrial rails |
| Quiescent current | 700 μA; enables battery-powered portable instrumentation with multi-year runtime |
| Gain equation | G = 1 + 49.4 kΩ/RG; matches pin-compatible alternatives like INA821 for seamless redesign |
Pinout & Package
INA129UA/2K5G4 is supplied in an 8-pin SOIC (D) package measuring 4.9 mm × 6 mm, optimized for surface-mount assembly and thermal performance (RθJA = 110°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 8 | RG (Gain resistor terminals) | Connect external resistor between these pins to set gain per G = 1 + 49.4 kΩ/RG |
| 2 | VIN– | Inverting input; high-impedance node (10 GΩ || 2 pF) for differential sensing |
| 3 | VIN+ | Non-inverting input; matched to VIN– for optimal CMRR and bias current cancellation |
| 4 | V– | Negative supply rail; must be connected to system ground or negative voltage source |
| 5 | REF | Output reference; sets DC level of VO; requires low-impedance connection to maintain CMRR |
| 6 | VO | Amplified output; swing limited to (V–) + 1.4 V / (V+) – 1.4 V (CSO: SHE) or tighter margins (CSO: FRE) |
| 7 | V+ | Positive supply rail; supports up to ±18 V; decoupling capacitor recommended near pin |
Key Features
| Feature | Design Value |
|---|---|
| Laser-trimmed gain network | Enables 0.025% gain error at G = 10 (CSO: FRE), reducing calibration burden in production test |
| Input overvoltage protection | Sustains ±40 V applied to VIN+ or VIN– without latch-up or parametric shift - critical for field-deployed sensors |
| Low 1/f noise | 0.2 μVPP (0.1–10 Hz); preserves signal integrity in slow-varying physiological and strain measurements |
| Wide common-mode range | Operates with inputs from (V–) + 2 V to (V+) – 2 V; accommodates large sensor offsets without clipping |
| Single-supply capability | Functions from 4.5 V to 36 V single supply; simplifies power architecture in isolated analog front-ends |
Applications
| Pressure Transmitter | ECG Monitoring System |
|---|---|
Use Scenario: Amplifying mV-level bridge output from piezoresistive pressure sensors in HVAC or process control. IC Role / Device Role / Timing Role: Precision instrumentation amplifier providing gain, common-mode rejection, and input protection before ADC sampling. Use Value: 120 dB CMRR suppresses power-line interference; ±40 V protection prevents damage from cable ESD events. |
Use Scenario: Conditioning differential biopotential signals from limb electrodes in portable ECG devices. IC Role / Device Role / Timing Role: Front-end IA rejecting 50/60 Hz mains noise while preserving sub-μV ST-segment morphology. Use Value: 0.2 μVPP low-frequency noise enables clean baseline stability; 700 μA IQ extends battery life. |
| Weigh Scale Load Cell Interface | Analog Input Module |
Use Scenario: Amplifying µV-level outputs from 350 Ω or 1 kΩ strain-gauge bridges in industrial weighing platforms. IC Role / Device Role / Timing Role: High-Z, low-drift IA establishing accurate zero and span calibration points for 24-bit ΣΔ ADCs. Use Value: 50 μV max VOS and 0.5 μV/°C drift minimize temperature-induced weight drift; SOIC-8 eases layout in dense modules. |
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: Configurable gain IA supporting multiple sensor types via software-selected RG values. Use Value: G = 1 to 10,000 programmability via single resistor; ±18 V supply headroom handles industrial transients. |
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 G = 1 + 50 kΩ/RG; 50 μV max VOS; identical pinout and SOIC-8 package | Preferred where legacy designs use 50 kΩ standard resistor values; no PCB change required | Select INA128UA/2K5 when maintaining existing 50 kΩ-based gain networks or qualifying against older reference designs |
| INA821IDGKR | Lower 0.4 μV/°C drift, 7 nV/√Hz noise, 49.4 kΩ gain equation; same SOIC-8 footprint | Better suited for high-precision, wide-temperature-range applications demanding <0.1 μV/°C drift | Choose INA821IDGKR when upgrading for improved long-term stability and lower noise in new designs |
Compared with INA129UA/2K5G4, INA128UA/2K5 offers identical form-factor compatibility but uses a different gain equation, while INA821IDGKR provides superior drift and noise specs at higher cost - making INA129UA/2K5G4 the optimal balance of legacy compatibility, protection robustness, and cost-sensitive precision.
Availability
INA129UA/2K5G4 is available at Aetrix Electronics and suitable for pressure transmitter design, ECG monitoring systems, and industrial analog input modules requiring stable component supply across extended temperature ranges and multi-year production cycles.
Supply support for INA129UA/2K5G4 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 INA12x family was engineered for high-accuracy, low-power instrumentation in industrial sensing and medical diagnostics - prioritizing robust input protection, laser-trimmed dc precision, and flexible gain configuration via external resistors.
FAQ
What is the gain equation for INA129UA/2K5G4, and how does it differ from INA128?
The INA129UA/2K5G4 uses the gain equation G = 1 + 49.4 kΩ/RG, where RG is connected between pins 1 and 8. This differs from the INA128's G = 1 + 50 kΩ/RG equation. The 49.4 kΩ coefficient enables direct replacement of certain legacy instrumentation amplifiers without recalculating RG values - a key feature confirmed in TI's SBOS051G datasheet for INA129UA/2K5G4.
Does INA129UA/2K5G4 support single-supply operation?
Yes, INA129UA/2K5G4 supports single-supply operation from 4.5 V to 36 V, as specified in Section 6.3 of the datasheet. When operated from a single supply, the input common-mode range extends from (V–) + 2 V to (V+) – 2 V, and the REF pin must be biased appropriately to center the output swing - ensuring full functionality in battery-powered or isolated analog front-ends using INA129UA/2K5G4.
What is the maximum input overvoltage rating for INA129UA/2K5G4?
The INA129UA/2K5G4 has guaranteed ±40 V absolute maximum input voltage rating on both VIN+ and VIN– pins, independent of supply voltage. This is enabled by internal overvoltage protection circuitry documented in Figures 6-16 and 6-17 of the SBOS051G datasheet - allowing direct connection to industrial sensors without external protection components, a verified specification for INA129UA/2K5G4.
How does the chip site origin (CSO) affect INA129UA/2K5G4 performance?
INA129UA/2K5G4 is qualified across two chip site origins: FRE and SHE. CSO: FRE delivers tighter input bias current (0.15–0.6 nA) and better bandwidth at high gain (33 kHz at G = 1000), while CSO: SHE offers higher short-circuit current (+6/–15 mA) and wider output swing margins. Both meet all datasheet limits, and TI recommends designing for worst-case parameters across both flows - a requirement explicitly stated for INA129UA/2K5G4 in Section 6.
Is INA129UA/2K5G4 RoHS-compliant and halogen-free?
Yes, INA129UA/2K5G4 is RoHS-compliant and halogen-free, as confirmed in Texas Instruments' official packaging information (SLAU273) and material content declarations. The SOIC-8 package (D) carries the "G4" suffix denoting green, lead-free, and halogen-free construction - meeting IPC/JEDEC J-STD-609A standards for environmentally compliant manufacturing using INA129UA/2K5G4.
INA129UA/2K5G4 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/2K5G4 FAQ
1.How can I place an order for INA129UA/2K5G4 through Aetrix?
Please submit a Request for Quotation (RFQ) for INA129UA/2K5G4 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/2K5G4 reliable?
The price and inventory of INA129UA/2K5G4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA129UA/2K5G4 is usually 5 days.
3.What payment methods are accepted for INA129UA/2K5G4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA129UA/2K5G4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA129UA/2K5G4?
INA129UA/2K5G4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA129UA/2K5G4 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/2K5G4?
For technical support, including INA129UA/2K5G4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA129UA/2K5G4 requirements.
6.How does Aetrix verify that INA129UA/2K5G4 is sourced from the original manufacturer or authorized distributors?
All INA129UA/2K5G4 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/2K5G4 meets industry standards.
7.What is the process for return or replacement of INA129UA/2K5G4?
All INA129UA/2K5G4 units undergo pre-shipment inspection (PSI). If there is an issue with INA129UA/2K5G4, 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/2K5G4 part is unused and in its original packaging.
Return procedure for INA129UA/2K5G4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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