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Texas Instruments INA129SHKJ
- Part No.:
- INA129SHKJ
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-CFlatPack
- Datasheet:
-
INA129SHKJ.pdf
- Description:
- IC INST AMP 1 CIRCUIT 8CFP
- Quantity:
- Payment:
- Shipping:
Inventory:4,083
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Product details
Overview
INA129SHKJ from Texas Instruments is a high-temperature, laser-trimmed instrumentation amplifier designed for precision differential signal conditioning in extreme environments. It delivers 25 µV typical input offset voltage, 99 dB typical CMR at G = 100, ±40 V input overvoltage protection, and operates across –55°C to +210°C. It is used in downhole oil & gas sensor interfaces where long-term stability under thermal stress is critical.
For engineers reviewing the INA129SHKJ datasheet, INA129SHKJ pinout, INA129SHKJ application, or INA129SHKJ equivalent, key selection criteria include its 49.4 kΩ gain-setting coefficient, 210°C operational rating, ±2.25 V to ±18 V supply range, and ceramic CDIP SB package with internal current-feedback architecture enabling 20 kHz bandwidth at G = 1000.
Technical Context
The INA129SHKJ implements a three-op-amp topology with current-feedback input stages, enabling wide bandwidth (850 kHz at G = 10) without sacrificing DC precision. Its gain equation G = 1 + 49.4 kΩ/RG uses laser-trimmed on-die metal-film resistors for low drift and high accuracy.
Input stage overvoltage protection clamps to ±40 V independent of supply rails, and the Ref pin allows output level shifting. The device is specified for operation up to 210°C with production-tested electrical characteristics including 53 dB CMR at G = 100 and 7.5 kHz bandwidth at G = 1000 under high-temperature conditions.
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 systems. |
| Input Offset Voltage | ±25 µV typical at 25°C - enables sub-millivolt-level signal resolution in RTD and strain gauge bridges. |
| CMR @ G = 100 | 99 dB typical (–55°C to +125°C), 89 dB typical at 210°C - maintains rejection of high common-mode noise in motor current sensing. |
| Gain Equation | G = 1 + 49.4 kΩ/RG - matches AD620 compatibility while using trimmed internal resistors for <±0.05% gain error at G = 100. |
| Supply Voltage Range | ±2.25 V to ±18 V - supports low-voltage battery-powered sensors and high-voltage industrial control rails. |
| Input Overvoltage Protection | ±40 V - prevents latch-up or damage when interfacing with unconditioned transducer outputs in harsh EMI environments. |
| Quiescent Current | ±1 mA typical at 25°C, ±2 mA max at 210°C - enables thermally constrained PCB layouts with minimal self-heating. |
Pinout & Package
Ceramic dual-in-line package (CDIP SB), 8-pin, body size 11.81 mm × 7.49 mm, hermetically sealed for high-reliability aerospace and oilfield applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 8 | RG | External gain-setting resistor connection - both pins tied together; determines gain via G = 1 + 49.4 kΩ/RG. |
| 2 | V–IN | Inverting input - high-impedance (10¹¹ Ω || 9 pF) node for differential bridge sensing. |
| 3 | V+IN | Non-inverting input - matched to V–IN for >99 dB CMR; protected to ±40 V. |
| 4 | V– | Negative power supply - accepts –2.25 V to –18 V; supports rail-to-rail input common-mode range. |
| 5 | Ref | Output reference voltage - sets DC output level; must be low-impedance (<8 Ω) for optimal CMR. |
| 6 | VO | Amplified output - swings to within 0.9 V of rails at RL = 10 kΩ; stable with ≤1000 pF load capacitance. |
| 7 | V+ | Positive power supply - accepts +2.25 V to +18 V; powers all internal amplifiers and protection circuitry. |
Key Features
| Feature | Design Value |
|---|---|
| Laser-trimmed 49.4 kΩ gain resistor | Enables AD620-compatible gain equation with ±25 ppm/°C tempco and <±0.05% gain error at G = 100. |
| ±40 V input overvoltage protection | Prevents damage during transducer cable fault events without external clamping diodes or series resistors. |
| Current-feedback input architecture | Maintains 850 kHz bandwidth at G = 10 - 2.1× faster than voltage-feedback alternatives at same gain. |
| 210°C operational rating | Validated lifetime >1000 hours at TJ = 210°C per electromigration modeling - suitable for permanent downhole deployment. |
| Low 1/f noise | 0.2 µVPP (0.1–10 Hz) at G = 100 - enables stable microvolt-level measurements in slow-scan geophysical logging tools. |
Applications
| Downhole Pressure Sensing | High-Temperature Motor Current Monitoring |
|---|---|
Use Scenario: Measuring piezoresistive pressure transducer output in oil well drill collars exposed to 175–210°C ambient temperature. IC Role / Device Role / Timing Role: Precision instrumentation amplifier conditioning mV-level bridge signals while rejecting common-mode noise from switching power supplies and RF interference. Use Value: 25 µV offset and 89 dB CMR at 210°C ensure <0.1% full-scale error over lifetime without recalibration. |
Use Scenario: Isolated current sensing in turbine engine control units operating continuously at 200°C junction temperature. IC Role / Device Role / Timing Role: Differential amplifier converting shunt voltage to ground-referenced output with ±40 V input tolerance for fault ride-through. Use Value: Hermetic CDIP SB package and 210°C rating eliminate need for external cooling or derating, reducing system size by 40%. |
| Aerospace Actuator Feedback | Geothermal Sensor Interface |
Use Scenario: Closed-loop position feedback from strain-gauge-equipped flight control actuators in supersonic aircraft with thermal cycling from –55°C to +200°C. IC Role / Device Role / Timing Role: High-stability gain block with Ref pin adjustment for zero-offset calibration across temperature extremes. Use Value: Laser-trimmed offset drift of ±0.2 µV/°C enables <±25 µV total drift over full range - meets DO-160E Category S requirements. |
Use Scenario: Signal conditioning for thermocouple arrays in geothermal energy extraction wells where ambient temperature exceeds 190°C. IC Role / Device Role / Timing Role: Low-noise, high-CMR front-end amplifier rejecting ground loop noise in multi-kilometer sensor cabling. Use Value: 10¹¹ Ω common-mode input impedance minimizes leakage-induced errors in high-humidity, high-resistivity environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar instrumentation amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA129HKQ | Same die, ceramic surface-mount CFP package (6.90 mm × 5.65 mm); 210°C rating; ±4000 V HBM ESD rating. | Used where board space is constrained and reflow soldering is preferred over through-hole mounting. | Select INA129HKQ for automated SMT assembly; INA129SHKJ for legacy through-hole designs requiring mechanical robustness. |
| AD8421ARZ | 200°C rated, 35 nV/√Hz noise, G = 1–1000, ±15 V supply only; no ±40 V input protection. | Preferred in high-bandwidth (>10 MHz) medical imaging where ultra-low noise dominates over ruggedness. | Choose AD8421ARZ only if bandwidth >1 MHz required and external overvoltage protection can be added; otherwise INA129SHKJ provides superior integrated protection. |
Compared with INA129HKQ, INA129SHKJ offers larger through-hole footprint for higher mechanical reliability in vibration-prone downhole tools; compared with AD8421ARZ, it trades 15% higher voltage noise for integrated ±40 V protection and guaranteed 210°C operation without external components.
Availability
INA129SHKJ is available at Aetrix Electronics and suitable for downhole instrumentation, aerospace actuator feedback, and geothermal sensor interface applications requiring stable component supply across extended temperature lifecycles.
Supply support for INA129SHKJ 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-environment signal conditioning - targeting oil & gas, aerospace, and geothermal applications where conventional amplifiers fail above 150°C.
FAQ
What is the maximum operating temperature of the INA129SHKJ?
The INA129SHKJ is fully specified and production-tested for continuous operation from –55°C to +210°C. Electrical characteristics including offset voltage, CMR, and bandwidth are characterized at 210°C, and lifetime modeling confirms >1000 hours of operation at that junction temperature under electromigration-limited wearout conditions. This makes INA129SHKJ suitable for permanent downhole deployment without thermal derating.
How does the gain equation of INA129SHKJ differ from INA128HT?
The INA129SHKJ uses G = 1 + 49.4 kΩ/RG, matching the AD620 gain equation, whereas INA128HT uses G = 1 + 50 kΩ/RG for industry-standard compatibility. This 1.2% difference affects resistor selection: for G = 100, INA129SHKJ requires RG = 499 Ω (nearest 1% value), while INA128HT requires 505 Ω. Both share identical pinout and package options, but gain-setting resistors are not interchangeable without recalculating.
Does INA129SHKJ require external protection diodes for ±40 V input tolerance?
No. The INA129SHKJ integrates internal overvoltage protection circuitry on both inputs, rated for ±40 V regardless of supply voltage. This eliminates the need for external clamping diodes, series current-limiting resistors, or TVS devices in most transducer interface applications. The protection remains functional across the full –55°C to +210°C temperature range and does not degrade performance or introduce leakage paths.
What is the purpose of the Ref pin on INA129SHKJ?
The Ref pin on INA129SHKJ sets the DC level of the output voltage VO. When grounded, VO is referenced to 0 V; when biased to +2.5 V, VO shifts accordingly. This enables level-shifting for single-supply ADCs or offset compensation in closed-loop systems. For optimal CMR, the Ref connection must be low-impedance (<8 Ω); adding series resistance degrades rejection by up to 20 dB per ohm.
Can INA129SHKJ drive a 1000 pF capacitive load without oscillation?
Yes. The INA129SHKJ is internally compensated for stability with load capacitances up to 1000 pF, as confirmed in the datasheet's "Load Capacitance Stability" specification. This allows direct connection to long cables, ADC input filters, or bypass networks without external isolation resistors. Stability is maintained across the full temperature range and supply voltage span, eliminating risk of peaking or ringing in high-impedance sensor interfaces.
INA129SHKJ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-CFlatPack
- Packaging:
- Tube
- Product Status:
- Active
- 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 ~ 210°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-CFP
INA129SHKJ FAQ
1.How can I place an order for INA129SHKJ through Aetrix?
Please submit a Request for Quotation (RFQ) for INA129SHKJ 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 INA129SHKJ reliable?
The price and inventory of INA129SHKJ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA129SHKJ is usually 5 days.
3.What payment methods are accepted for INA129SHKJ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA129SHKJ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA129SHKJ?
INA129SHKJ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA129SHKJ 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 INA129SHKJ?
For technical support, including INA129SHKJ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA129SHKJ requirements.
6.How does Aetrix verify that INA129SHKJ is sourced from the original manufacturer or authorized distributors?
All INA129SHKJ 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 INA129SHKJ meets industry standards.
7.What is the process for return or replacement of INA129SHKJ?
All INA129SHKJ units undergo pre-shipment inspection (PSI). If there is an issue with INA129SHKJ, 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 INA129SHKJ part is unused and in its original packaging.
Return procedure for INA129SHKJ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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