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Texas Instruments INA128PG4
- Part No.:
- INA128PG4
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
INA128PG4.pdf
- Description:
- IC INST AMP 1 CIRCUIT 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,840
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Product details
Overview
INA128PG4 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, 120 dB minimum CMRR at G = 100, and 1.3 MHz bandwidth at unity gain - enabling accurate measurement of microvolt-level sensor outputs in pressure transmitters and ECG front-ends.
For engineers reviewing the INA128PG4 datasheet, INA128PG4 pinout, INA128PG4 application, or INA128PG4 equivalent, key selection criteria include its ±2.25V to ±18V dual-supply operation, 700 μA quiescent current, 8-pin PDIP package with input overvoltage protection to ±40 V, and laser-trimmed gain equation (G = 1 + 50 kΩ/RG) supporting gains from 1 to 10,000.
Technical Context
The INA128PG4 implements a three-op-amp architecture with current-feedback input stages, enabling stable 200 kHz bandwidth even at G = 100. Its input stage features integrated overvoltage protection diodes and high-impedance FET buffers (10 GΩ differential, 100 GΩ common-mode), eliminating external protection and matching networks.
Gain is set by a single external resistor between pins 1 and 8, with the INA128's industry-standard 50 kΩ term ensuring compatibility with legacy designs. The device operates across –40°C to +85°C and supports reference pin biasing for level-shifting output signals relative to ground or system rails.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Offset voltage | 50 μV max - ensures ≤0.5 mV error at G = 100 without trimming |
| CMRR | 120 dB min at G = 100 - rejects >1 V common-mode interference while amplifying 10 mV differential signals |
| Bandwidth | 1.3 MHz at G = 1 - supports fast step response in data acquisition systems sampling up to 200 kSPS |
| Input protection | ±40 V - allows direct connection to industrial sensors without external clamping |
| Quiescent current | 700 μA - enables battery-powered portable instrumentation with multi-year runtime |
| Supply range | ±2.25V to ±18V - interoperates with legacy ±15V analog rails and modern low-voltage mixed-signal systems |
| Noise density | 8 nV/√Hz - contributes <1.5 μVRMS integrated noise in 10 kHz bandwidth |
Pinout & Package
INA128PG4 uses an 8-pin plastic DIP (PDIP) package measuring 9.81 mm × 9.43 mm, with through-hole mounting and 0.3-inch row spacing. Pin 1 is marked with a notch or dot; pin numbering follows standard DIP convention (counterclockwise from top-left).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RG (Gain resistor terminal) | Connects to external gain-setting resistor; forms G = 1 + 50 kΩ/RG with pin 8 |
| 2 | VIN– | Inverting input; high-impedance node protected to ±40 V |
| 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; sets DC level of VO; requires low-impedance connection to maintain CMRR |
| 6 | VO | Differential output; swing limited to (V–)+1.4V to (V+)-1.4V (CSO: SHE) |
| 7 | V+ | Positive supply rail; accepts up to ±18V; decoupling capacitor required |
| 8 | RG (Gain resistor terminal) | Completes gain resistor path; open-circuit yields G = 1 |
Key Features
| Feature | Design Value |
|---|---|
| Laser-trimmed offset & drift | 50 μV max VOS, 0.5 μV/°C max drift - eliminates need for system-level calibration over temperature |
| Input overvoltage protection | ±40 V fault tolerance - removes external TVS diodes in 24V industrial sensor interfaces |
| Single-resistor programmable gain | G = 1 to 10,000 via RG - simplifies BOM and layout vs. multi-resistor or digital gain solutions |
| High input impedance | 10 GΩ || 2 pF differential - prevents loading of high-Z piezoresistive and thermocouple sources |
| Low quiescent power | 700 μA IQ - enables 16-bit DAQ modules to meet <1 mW per channel targets |
Applications
| Pressure transmitter | Temperature transmitter |
|---|---|
Use Scenario: Amplifying mV-level bridge output from strain-gauge-based pressure sensors in HVAC and process control systems. IC Role / Device Role / Timing Role: Precision instrumentation amplifier providing gain, common-mode rejection, and rail-to-rail output swing referenced to system ground. Use Value: 120 dB CMRR suppresses 4–20 mA loop-induced noise; ±40 V input protection withstands field wiring faults. | Use Scenario: Conditioning RTD or thermocouple signals in industrial temperature monitoring nodes with 0.1°C accuracy requirements. IC Role / Device Role / Timing Role: Low-drift, low-noise front-end amplifier rejecting thermal EMFs and power supply ripple. Use Value: 0.5 μV/°C drift limits temperature error to <0.01°C over 85°C span; 8 nV/√Hz noise preserves resolution in 24-bit ΣΔ ADCs. |
| Weigh scale | Electrocardiogram (ECG) |
Use Scenario: Reading microvolt-level outputs from load-cell bridges in commercial and medical weighing platforms. IC Role / Device Role / Timing Role: High-gain (G = 1000), low-noise amplifier with stable DC performance for static weight measurement. Use Value: 50 μV offset ensures <0.05% full-scale error at G = 1000; 1.3 MHz bandwidth supports fast settling after mechanical vibration. | Use Scenario: Biopotential signal amplification in portable ECG monitors requiring high CMRR against 50/60 Hz mains interference. IC Role / Device Role / Timing Role: Front-end instrumentation amplifier rejecting common-mode electrode offsets and electromagnetic pickup. Use Value: 120 dB CMRR at 60 Hz reduces 1 V interference to 1 μV residual; ±40 V protection guards against defibrillator discharge events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar instrumentation amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA128P | Same die, identical specifications, but in SOIC-8 package (4.9 mm × 6 mm) | Suitable for space-constrained PCBs; requires rework of footprint and thermal design | Select for surface-mount production; verify solder profile compatibility with PDIP-reflow processes |
| INA129PG4 | Uses 49.4 kΩ gain term (G = 1 + 49.4 kΩ/RG) for drop-in replacement of competing devices | Enables direct substitution where legacy designs specify 49.4 kΩ-based gain equations | Select when migrating from AD620-family or other 49.4 kΩ-reference amplifiers; same pinout and package |
Compared with INA128P and INA129PG4, the INA128PG4 provides identical electrical performance in a through-hole PDIP package optimized for prototyping, manual assembly, and high-reliability industrial modules - while INA128P offers miniaturization and INA129PG4 enables seamless migration from alternative gain-equation ecosystems.
Availability
INA128PG4 is available at Aetrix Electronics and suitable for pressure transmitter, ECG monitor, and weigh scale applications requiring stable component supply, long-term obsolescence management, and traceable sourcing for medical and industrial certifications.
Supply support for INA128PG4 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 product line was engineered for high-accuracy, low-power industrial and medical sensor signal conditioning - delivering laser-trimmed precision, robust input protection, and flexible gain architecture in compact packages.
FAQ
What is the maximum gain achievable with INA128PG4?
The INA128PG4 supports gains from 1 to 10,000 using a single external resistor (RG) between pins 1 and 8, per the equation G = 1 + 50 kΩ/RG. At G = 10,000, RG = 5 Ω; stability and noise performance must be verified at extreme gains. The INA128PG4 maintains usable bandwidth down to ~20 kHz at G = 1000.
Does INA128PG4 require external input protection circuitry?
No - the INA128PG4 integrates input overvoltage protection capable of withstanding ±40 V continuously without damage, as confirmed in the Absolute Maximum Ratings table. This eliminates the need for external TVS diodes or series resistors in most industrial sensor interface applications.
Can INA128PG4 operate from a single 5V supply?
Yes - the INA128PG4 supports single-supply operation from 4.5 V to 36 V. When using 5 V, the input common-mode range is approximately 2 V to 3 V, and output swing is limited to ~0.5 V to 4.5 V. Reference pin (pin 5) must be biased appropriately (e.g., to 2.5 V) to center the output.
How does the chip site origin (CSO) affect INA128PG4 performance?
The INA128PG4 is qualified across multiple fabrication flows (CSO: SHE and CSO: FRE). Key parameters like input bias current (5 nA max vs. 0.7 nA max) and noise (8 nV/√Hz vs. 6.9 nV/√Hz) vary by CSO. Designs requiring worst-case guarantees must use the more conservative SHE-spec values unless FRE-specific qualification is confirmed.
What is the recommended bypass capacitor for INA128PG4 power pins?
Texas Instruments recommends 0.1 μF ceramic capacitors placed as close as possible to pins 4 (V–) and 7 (V+), with short traces to ground. For noisy supplies, add a 10 μF tantalum or aluminum electrolytic in parallel. This ensures stable operation and preserves PSRR above 10 kHz, as validated in Figure 8-1 and Section 8.4 of the INA128PG4 datasheet.
INA128PG4 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
INA128PG4 FAQ
1.How can I place an order for INA128PG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for INA128PG4 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 INA128PG4 reliable?
The price and inventory of INA128PG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA128PG4 is usually 5 days.
3.What payment methods are accepted for INA128PG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA128PG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA128PG4?
INA128PG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA128PG4 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 INA128PG4?
For technical support, including INA128PG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA128PG4 requirements.
6.How does Aetrix verify that INA128PG4 is sourced from the original manufacturer or authorized distributors?
All INA128PG4 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 INA128PG4 meets industry standards.
7.What is the process for return or replacement of INA128PG4?
All INA128PG4 units undergo pre-shipment inspection (PSI). If there is an issue with INA128PG4, 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 INA128PG4 part is unused and in its original packaging.
Return procedure for INA128PG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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