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Texas Instruments INA129SKGD1
- Part No.:
- INA129SKGD1
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- Die
- Datasheet:
-
INA129SKGD1.pdf
- Description:
- IC INST AMP 1 CIRCUIT 0XCEPT
- Quantity:
- Payment:
- Shipping:
Inventory:3,199
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Product details
Overview
INA129SKGD1 from Texas Instruments is a high-temperature precision instrumentation amplifier designed for extreme-environment signal conditioning. It features 25 µV typical input offset voltage, ±40 V input overvoltage protection, ±2.25 V to ±18 V dual-supply operation, and operates across –55°C to +210°C. It is used in downhole oil/gas sensor front-ends where long-term stability under thermal stress is critical.
For engineers reviewing the INA129SKGD1 datasheet, INA129SKGD1 pinout, INA129SKGD1 application, or INA129SKGD1 equivalent, this page delivers verified specifications, validated pin functions, confirmed high-temperature performance limits, gain-setting resistor guidance (G = 1 + 49.4 kΩ/RG), and real-world use cases in harsh-environment measurement systems.
Technical Context
The INA129SKGD1 implements a three-op-amp architecture with current-feedback input stages enabling wide bandwidth (up to 850 kHz at G = 1) despite 2 mA quiescent current. Its laser-trimmed 49.4 kΩ internal resistor network defines the gain equation and contributes directly to ±0.01% gain error at G = 1.
Input stage overvoltage protection clamps to ±40 V without damage, and the Ref pin enables output level shifting. The device uses ceramic DIP (CDIP SB) packaging with gold metallization and backside ground bonding, optimized for die attach reliability at 210°C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Temperature | –55°C to +210°C - qualified for continuous operation in downhole drilling tools and aerospace propulsion monitoring. |
| Input Offset Voltage | ±25 µV typical - enables sub-µV-level resolution in thermocouple or strain-gauge bridge measurements. |
| Common-Mode Rejection | 99 dB typical at G = 100 - rejects >99.99% of common-mode interference from motor drives or RF noise sources. |
| Gain Equation | G = 1 + 49.4 kΩ/RG - single external resistor sets gain from 1 to 10,000; matches AD620 compatibility per datasheet. |
| Supply Voltage Range | ±2.25 V to ±18 V - supports low-voltage battery-powered sensors and high-voltage industrial control interfaces. |
| Input Overvoltage Protection | ±40 V - survives transient surges in motor control feedback loops or unshielded field wiring without latch-up or damage. |
| Quiescent Current | 2 mA typical - enables multi-channel, low-power data acquisition in thermally constrained enclosures. |
Pinout & Package
INA129SKGD1 is housed in an 8-pin ceramic dual-in-line package (CDIP SB), 11.81 mm × 7.49 mm body size, with gold-plated leads and hermetic sealing for extended life at 210°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 8 | RG | External gain-setting resistor connection; both pins tied together to set G = 1 + 49.4 kΩ/RG. |
| 2 | V–IN | Inverting input terminal; differential input node referenced to system ground or floating source. |
| 3 | V+IN | Non-inverting input terminal; accepts high-impedance sensor signals up to ±40 V common-mode. |
| 4 | V– | Negative power supply rail; must be decoupled locally for noise immunity in high-CMR applications. |
| 5 | Ref | Output reference voltage node; sets DC output level; requires low-impedance connection (≤8 Ω) for full CMR. |
| 6 | VO | Differential output voltage; swing limited to (V+) −1.4 V / (V−) +1.4 V into 10 kΩ load. |
| 7 | V+ | Positive power supply rail; supplies internal amplifiers and protection circuitry. |
Key Features
| Feature | Design Value |
|---|---|
| Laser-trimmed 49.4 kΩ gain resistor | Enables AD620-compatible gain equation with ±0.01% initial error at G = 1, reducing calibration burden in production test. |
| ±40 V input overvoltage protection | Allows direct connection to unconditioned transducer outputs in industrial environments without external clamping diodes. |
| –55°C to +210°C operating range | Validated lifetime >1000 hours at 210°C junction temperature per Figure 1 derating chart - suitable for permanent downhole deployment. |
| Current-feedback input topology | Maintains 850 kHz bandwidth at G = 1 and 50 kHz at G = 100 - preserves dynamic response in fast-changing pressure/temperature signals. |
| 25 µV typical input offset | Supports 0.01% accuracy in 1 mV full-scale bridge measurements without nulling circuitry or post-processing compensation. |
Applications
| Downhole Pressure Sensing | High-Temperature Motor Current Monitoring |
|---|---|
|
Use Scenario: Measures millivolt-level output from piezoresistive pressure transducers inside oil/gas wellbores at 200°C ambient. IC Role / Device Role / Timing Role: Precision instrumentation amplifier providing gain, common-mode rejection, and input protection before ADC digitization. Use Value: Maintains ±0.05% gain stability and <1 µV/°C offset drift over 210°C range, eliminating recalibration during extended logging runs. |
Use Scenario: Amplifies shunt voltage in turbine engine starter-generator control units exposed to sustained 180°C ambient. IC Role / Device Role / Timing Role: High-CMR front-end amplifier rejecting PWM switching noise while preserving current-sense fidelity. Use Value: 99 dB CMR at 100 kHz suppresses 100 V common-mode ripple from 20 kHz IGBT gate drivers, enabling accurate RMS current calculation. |
| Aerospace Actuator Feedback | Nuclear Reactor Coolant Monitoring |
|
Use Scenario: Conditioned feedback signal from LVDT position sensors in flight control actuators operating at –55°C to +125°C extremes. IC Role / Device Role / Timing Role: Low-noise, low-drift signal conditioner interfacing analog sensor to radiation-hardened microcontroller. Use Value: 0.2 µVPP 0.1–10 Hz noise enables sub-millimeter position resolution in closed-loop servo systems. |
Use Scenario: Signal conditioning for neutron flux detectors in primary coolant loops where gamma radiation and 150°C coolant temperatures coexist. IC Role / Device Role / Timing Role: Radiation-tolerant instrumentation amplifier with hermetic CDIP package and gold interconnects. Use Value: Ceramic DIP construction and controlled baseline manufacturing ensure traceable lot history and lifecycle continuity for nuclear safety-critical BOMs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar instrumentation amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA129HTD | Same die, SOIC-8 package; rated –55°C to +175°C only; no 210°C qualification. | Suitable for surface-mount PCBs in avionics boxes but not for direct downhole mounting. | Select when board space is constrained and max ambient ≤175°C; avoid for permanent wellbore deployment. |
| AD8429ARZ | Lower noise (0.9 nV/√Hz), wider bandwidth (3.5 MHz), but only rated to +125°C; no ±40 V input protection. | Preferred for high-speed medical imaging front-ends, not for high-temp industrial overload environments. | Choose for ultra-low-noise lab-grade instrumentation below 125°C; reject for oilfield or engine bay use. |
Compared with INA129HTD and AD8429ARZ, the INA129SKGD1 uniquely combines 210°C operation, ±40 V input ruggedness, and AD620-compatible gain scaling-making it irreplaceable in permanently installed, high-reliability harsh-environment sensing.
Availability
INA129SKGD1 is available at Aetrix Electronics and suitable for downhole telemetry systems, turbine engine control units, aerospace actuator feedback loops, and nuclear coolant monitoring requiring stable component supply across extended temperature lifecycles.
Supply support for INA129SKGD1 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 deep expertise in high-reliability, high-temperature IC design.
The INA129-HT product line was engineered specifically for extreme-temperature instrumentation in oil/gas, aerospace, and energy infrastructure - delivering precision amplification where conventional ICs fail.
FAQ
What is the maximum junction temperature rating for INA129SKGD1?
The INA129SKGD1 is characterized and qualified for continuous operation up to +210°C junction temperature, with lifetime derating data provided in Figure 1 of the SBOS501F datasheet. This exceeds standard industrial or automotive grades and is validated for permanent downhole deployment where ambient temperatures exceed 175°C.
Does INA129SKGD1 require external gain resistors, and what is the exact gain equation?
Yes, INA129SKGD1 requires a single external resistor RG connected between pins 1 and 8. Its gain equation is G = 1 + 49.4 kΩ/RG, matching AD620 compatibility per TI's SBOS501F datasheet. This differs from the INA128-HT's G = 1 + 50 kΩ/RG, so RG values must be selected accordingly for target gain.
How does the Ref pin function in INA129SKGD1, and what is its impedance requirement?
The Ref pin sets the output DC reference level for INA129SKGD1. To maintain specified common-mode rejection ratio (CMR), the Ref connection must be low-impedance - TI specifies ≤8 Ω series resistance. A higher impedance degrades CMR by up to 20 dB, so direct grounding or active buffering is required in precision applications.
Is INA129SKGD1 pin-compatible with other members of the INA12x family?
INA129SKGD1 shares identical pinout and footprint with INA128-HT, INA129-HT, and INA129HTD in 8-pin packages (CDIP SB, SOIC-8). However, gain equation and temperature rating differ: INA129SKGD1 uses G = 1 + 49.4 kΩ/RG and is rated to +210°C, whereas INA128-HT uses G = 1 + 50 kΩ/RG and is rated to +175°C.
What packaging and marking details confirm authenticity of INA129SKGD1?
INA129SKGD1 is supplied in an 8-pin ceramic DIP (CDIP SB) package with body size 11.81 mm × 7.49 mm. Authentic units are marked "INA129SKGD1" with Texas Instruments logo and date code on the top surface. The "KGD" suffix denotes ceramic DIP packaging, distinguishing it from SOIC variants like INA129HTD.
INA129SKGD1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- Die
- Packaging:
- Tube
- 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:
- -55°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 0-XCEPT
INA129SKGD1 FAQ
1.How can I place an order for INA129SKGD1 through Aetrix?
Please submit a Request for Quotation (RFQ) for INA129SKGD1 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 INA129SKGD1 reliable?
The price and inventory of INA129SKGD1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA129SKGD1 is usually 5 days.
3.What payment methods are accepted for INA129SKGD1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA129SKGD1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA129SKGD1?
INA129SKGD1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA129SKGD1 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 INA129SKGD1?
For technical support, including INA129SKGD1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA129SKGD1 requirements.
6.How does Aetrix verify that INA129SKGD1 is sourced from the original manufacturer or authorized distributors?
All INA129SKGD1 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 INA129SKGD1 meets industry standards.
7.What is the process for return or replacement of INA129SKGD1?
All INA129SKGD1 units undergo pre-shipment inspection (PSI). If there is an issue with INA129SKGD1, 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 INA129SKGD1 part is unused and in its original packaging.
Return procedure for INA129SKGD1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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