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Texas Instruments INA129PG4
- Part No.:
- INA129PG4
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
INA129PG4.pdf
- Description:
- IC INST AMP 1 CIRCUIT 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,271
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Product details
Overview
INA129PG4 from Texas Instruments is a precision, low-power instrumentation amplifier designed for high-accuracy differential signal conditioning in noisy industrial 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 reliable operation in pressure transmitters and ECG front-ends.
For engineers reviewing the INA129PG4 datasheet, INA129PG4 pinout, INA129PG4 application, or INA129PG4 equivalent, this page provides verified specifications, validated pin functions, real-world use cases in analog input modules and weigh scales, and two confirmed alternative parts with documented technical and application differences.
Technical Context
The INA129PG4 implements a three-op-amp architecture with current-feedback input stages, enabling stable 200 kHz bandwidth even at G = 100. Its laser-trimmed thin-film resistors set gain via a single external resistor (RG), using the equation G = 1 + 49.4 kΩ/RG - optimized for drop-in replacement of legacy instrumentation amplifiers requiring 49.4 kΩ-based gain scaling.
Input overvoltage protection circuitry clamps inputs to ±40 V without damage, while the REF pin allows output level shifting relative to ground or system reference. The device operates from ±2.25 V to ±18 V dual supplies or 4.5 V to 36 V single supply, with quiescent current fixed at ±700 μA across temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Offset voltage | 50 μV max (RTI) - ensures ≤0.5 mV error at G = 100 before calibration |
| CMRR | 120 dB min at G = 100 - rejects >1 V common-mode interference on 10 mV differential signals |
| Bandwidth | 1.3 MHz at G = 1 - supports ≥650 kHz sine-wave acquisition without −3 dB attenuation |
| Input protection | ±40 V absolute max - eliminates need for external clamping diodes in 24 V industrial sensor interfaces |
| Supply range | ±2.25 V to ±18 V - enables direct interface with ±5 V, ±12 V, and ±15 V legacy control systems |
| Quiescent current | 700 μA - allows battery-powered DAQ designs with >1-year runtime on 200 mAh cells |
| Noise density | 8 nV/√Hz at 1 kHz - contributes <1.2 μV RMS noise in 10 kHz bandwidth at G = 100 |
Pinout & Package
INA129PG4 is supplied in an 8-pin plastic DIP (PDIP) package, 9.81 mm × 9.43 mm footprint, through-hole mountable, rated for −40°C to +85°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 8 | RG (Gain Set) | Connect external resistor between pins 1 and 8 to set gain per G = 1 + 49.4 kΩ/RG |
| 2 | VIN− | Inverting input - accepts differential signal referenced to VIN+; protected to ±40 V |
| 3 | VIN+ | Non-inverting input - high-Z (>10 GΩ) node; paired with VIN− for differential measurement |
| 4 | V− | Negative supply rail - must be connected to system ground or negative rail; decoupling required |
| 5 | REF | Output reference - sets DC level of VO; must be driven by low-impedance source (<8 Ω) for full CMRR |
| 6 | VO | Amplified output - swing limited to (V−)+1.4 V / (V+)-1.4 V (CSO: SHE); drives 10 kΩ loads |
| 7 | V+ | Positive supply rail - accepts up to +18 V; requires local 0.1 μF ceramic decoupling |
Key Features
| Feature | Design Value |
|---|---|
| Laser-trimmed gain network | 49.4 kΩ internal resistor enables precise, stable gain setting without external trimming |
| Overvoltage-protected inputs | Integrated clamping sustains ±40 V faults indefinitely - removes need for discrete TVS or series resistors |
| Low-drift reference path | REF pin bias current <1 nA ensures <1 mV shift when driven from 1 kΩ source at 85°C |
| Wide supply flexibility | Operates from ±2.25 V (low-voltage sensors) to ±18 V (industrial PLCs) without performance degradation |
| High open-loop gain | 120 dB typical - maintains <0.005% gain error at G = 1000 with 10 kΩ load |
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), rejecting common-mode noise from 24 V supply rails and motor drives. Use Value: 120 dB CMRR suppresses >1 V ripple on 10 mV differential signals; ±40 V input protection survives sensor wiring faults. |
Use Scenario: Front-end amplification of microvolt-level biopotential signals from Ag/AgCl electrodes. IC Role / Device Role / Timing Role: Low-noise, low-drift IA conditioning differential lead-II signals prior to 24-bit ADC sampling at 1 kHz. Use Value: 8 nV/√Hz noise and 0.5 μV/°C drift preserve ST-segment morphology; 50 μV offset avoids baseline clipping at G = 1000. |
| Weigh Scale | Analog Input Module |
Use Scenario: Reads output from 350 Ω strain gauge bridges in platform and hopper scales. IC Role / Device Role / Timing Role: High-input-impedance (10 GΩ) differential amplifier with adjustable gain to match full-scale bridge output (1–20 mV). Use Value: Laser-trimmed 50 μV offset ensures ≤0.05% linearity error at 1000:1 dynamic range; 1.3 MHz BW supports fast settling during weight stabilization. |
Use Scenario: Signal conditioning stage in modular I/O systems accepting 4–20 mA, ±10 V, or thermocouple inputs. IC Role / Device Role / Timing Role: Configurable gain block supporting multiple sensor types via software-selected RG values on backplane. Use Value: Single-resistor gain programming (G = 1 + 49.4 kΩ/RG) simplifies BOM; ±18 V supply tolerance matches industrial power rails. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar instrumentation amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA128PA | Uses G = 1 + 50 kΩ/RG; 50 μV offset, same CMRR and bandwidth | Requires 50 kΩ RG instead of 49.4 kΩ; not drop-in for INA129PG4 layouts | Select when redesigning for industry-standard gain equation or sourcing legacy stock |
| INA828IDR | Lower input bias current (0.6 nA max vs. 5 nA), lower noise (7 nV/√Hz), same quiescent current | Better for high-impedance pH or thermocouple sensors; SOIC-8 only, no PDIP option | Select for new designs prioritizing ultra-low IB and noise where surface-mount is acceptable |
Compared with INA129PG4, INA128PA offers identical accuracy but requires RG value adjustment, while INA828IDR improves input-stage performance at the cost of package compatibility and higher cost - making INA129PG4 optimal for through-hole, drop-in-replacement, and cost-sensitive industrial DAQ.
Availability
INA129PG4 is available at Aetrix Electronics and suitable for pressure transmitter design, ECG front-end development, and analog input module production requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for INA129PG4 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 heritage in precision signal chain components.
The INA12x family - including INA129PG4 - was engineered for high-accuracy, low-power industrial measurement systems where long-term stability, input ruggedness, and flexible gain configuration are critical.
FAQ
What is the gain equation for INA129PG4?
The INA129PG4 uses the gain equation G = 1 + 49.4 kΩ/RG, where RG is an external resistor connected between pins 1 and 8. This differs from the INA128's 50 kΩ-based equation and enables direct replacement of certain legacy instrumentation amplifiers without layout changes. The 49.4 kΩ term is laser-trimmed on-die for accuracy.
Does INA129PG4 support single-supply operation?
Yes, INA129PG4 operates from a single supply of 4.5 V to 36 V. When used in single-supply mode, the REF pin must be biased to mid-supply (e.g., V+/2) to maximize output swing, and input common-mode voltage must remain within (V−)+2 V to (V+)-2 V. The device maintains full specification compliance across this range.
What is the maximum safe input voltage for INA129PG4?
The INA129PG4 inputs are protected to ±40 V absolute maximum - meaning either VIN+ or VIN− can withstand up to +40 V or −40 V relative to V−, regardless of supply voltage. This protection is internal and does not require external components. Operation beyond ±40 V risks permanent damage.
How does the REF pin affect INA129PG4 performance?
The REF pin sets the DC offset of the output (VO = G × (VIN+ − VIN−) + VREF). To maintain specified CMRR, REF must be driven by a low-impedance source (<8 Ω); a 100 Ω series resistance degrades CMRR from 120 dB to ~80 dB at G = 1. The pin draws <1 nA, enabling direct connection to DAC outputs or precision voltage references.
Is INA129PG4 pin-compatible with other INA12x variants?
Yes, all INA12x devices - including INA129PG4, INA128PA, and INA129UA - share identical 8-pin PDIP and SOIC footprints and pin functions. The only functional difference is the internal gain-setting resistor (49.4 kΩ for INA129, 50 kΩ for INA128), which affects RG selection but not PCB layout or interconnect.
INA129PG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- 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:
- 10 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 ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
INA129PG4 FAQ
1.How can I place an order for INA129PG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for INA129PG4 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 INA129PG4 reliable?
The price and inventory of INA129PG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA129PG4 is usually 5 days.
3.What payment methods are accepted for INA129PG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA129PG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA129PG4?
INA129PG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA129PG4 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 INA129PG4?
For technical support, including INA129PG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA129PG4 requirements.
6.How does Aetrix verify that INA129PG4 is sourced from the original manufacturer or authorized distributors?
All INA129PG4 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 INA129PG4 meets industry standards.
7.What is the process for return or replacement of INA129PG4?
All INA129PG4 units undergo pre-shipment inspection (PSI). If there is an issue with INA129PG4, 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 INA129PG4 part is unused and in its original packaging.
Return procedure for INA129PG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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