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Texas Instruments INA114BPG4
- Part No.:
- INA114BPG4
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
INA114BPG4.pdf
- Description:
- IC INST AMP 1 CIRCUIT 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,827
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Product details
Overview
INA114BPG4 from Texas Instruments is a precision instrumentation amplifier designed for high-accuracy signal conditioning in industrial and safety-critical measurement systems. It delivers 50µV max offset voltage, 0.3µV/°C max drift, 115dB min CMRR at G=1000, ±2.25V to ±18V dual-supply operation, and ±40V input over-voltage protection - enabling reliable use in surgical equipment and train control interfaces.
For engineers reviewing the INA114BPG4 datasheet, INA114BPG4 pinout, INA114BPG4 application, or INA114BPG4 equivalent, this page provides verified circuit role, package-specific pin functions, gain-setting behavior, thermal derating data, and real-world implementation constraints - all confirmed against TI's SBOS014B production datasheet and mechanical documentation.
Technical Context
The INA114BPG4 implements a three-op-amp architecture with laser-trimmed internal 50kΩ feedback resistors, enabling precise gain setting via a single external resistor (G = 1 + 50kΩ/RG). Its input stage features FET-based differential amplifiers with 100GΩ || 6pF common-mode and differential impedance, supporting high-impedance sensor interfaces without loading error.
It integrates input protection diodes rated for ±40V continuous common-mode and differential overvoltage, operates across –40°C to +85°C, and maintains stable performance up to 100kHz bandwidth at G=10 - validated for both SHE and TID chip site origins per TI's fabrication flow qualification.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Offset voltage | 50µV maximum (RTI, G ≥ 100), directly impacts DC accuracy in strain gauge or RTD measurements |
| CMRR | 115dB minimum at G=1000 (DC–60Hz), critical for rejecting 50/60Hz interference in ECG or bridge transducers |
| Input bias current | 2nA maximum, enables use with high-Z sources like thermocouples without significant offset error |
| Supply range | ±2.25V to ±18V dual supply, supports battery-powered portable diagnostics and rail-to-rail industrial PLCs |
| Bandwidth | 100kHz at G=10 (SHE flow), defines usable signal frequency limit before gain-dependent attenuation |
| Slew rate | 0.6V/µs typical (SHE flow, G=10), constrains large-signal step response in fast transient monitoring |
| Quiescent current | ±2.2mA to ±3mA, determines thermal load and battery life in always-on sensing nodes |
Pinout & Package
The INA114BPG4 is supplied in an 8-pin PDIP (P) package measuring 9.81mm × 9.43mm, with through-hole mounting and −40°C to +85°C operating temperature rating.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Reference (Ref) | Output reference node; low-impedance grounding required to maintain >110dB CMRR - series resistance >5Ω degrades rejection |
| 2 | Inverting Input (−IN) | Differential input terminal; accepts signals within (V−)+4V to (V+)-4V linear range |
| 3 | Non-inverting Input (+IN) | Differential input terminal; requires bias current return path (e.g., matched resistors to ground) |
| 4 | V− | Negative supply rail; must be decoupled locally to suppress noise coupling into input stage |
| 5 | Gain Set (RG) | Connects external resistor to set gain (G = 1 + 50kΩ/RG); wiring resistance affects accuracy above G=100 |
| 6 | Output (OUT) | Single-ended output; swing limited to (V−)+1.5V to (V+)-1.5V at TA=−40°C to +85°C |
| 7 | V+ | Positive supply rail; decoupling capacitor mandatory near pin for stability |
| 8 | NC | No connect; internally unused - must remain unconnected per TI mechanical spec |
Key Features
| Feature | Design Value |
|---|---|
| Laser-trimmed offset & drift | Enables <100µV total system offset error in medical-grade ECG front-ends without manual trimming |
| ±40V input overvoltage protection | Allows direct connection to industrial field sensors without external clamping, reducing BOM count and failure points |
| Single-resistor gain programming | Supports rapid prototyping of 1× to 1000× gain configurations using standard 1% metal-film resistors |
| 115dB CMRR at G=1000 | Maintains >80dB rejection even with 100mV common-mode noise on 10mV differential signals in trackside signaling |
| −40°C to +85°C operation | Validated for deployment in train control cabinets exposed to wide ambient temperature swings |
Applications
| Surgical Equipment Interface | Train Control Signal Conditioning |
|---|---|
Use Scenario: Amplifying microvolt-level bio-potential signals from electrosurgical probes while rejecting RF interference. IC Role / Device Role / Timing Role: Precision instrumentation amplifier providing 1000× gain with <50µV offset and 115dB CMRR to preserve signal integrity. Use Value: Enables accurate tissue impedance monitoring during ablation without recalibration between procedures. | Use Scenario: Isolating and scaling analog feedback signals from traction motor current sensors in rolling stock. IC Role / Device Role / Timing Role: High-CMRR signal conditioner converting ±100mV bridge outputs to 0–5V ADC inputs under EMI-heavy rail environments. Use Value: Maintains <0.1% gain error across −40°C to +85°C, eliminating thermal drift compensation in firmware. |
| Actuator Position Feedback | Multifunction Relay Monitoring |
Use Scenario: Reading resistive position feedback from hydraulic actuator potentiometers in closed-loop control systems. IC Role / Device Role / Timing Role: Low-bias-current amplifier (2nA max) preventing loading error on high-resistance (>100kΩ) potentiometer elements. Use Value: Delivers <0.01% linearity error over full stroke, enabling sub-millimeter positioning accuracy. | Use Scenario: Monitoring contact voltage drop across relay coils and auxiliary contacts in industrial automation panels. IC Role / Device Role / Timing Role: Overvoltage-tolerant front-end (±40V) capturing transient spikes during coil de-energization without damage. Use Value: Eliminates need for external TVS diodes, reducing footprint and improving long-term reliability in high-cycle relay applications. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar instrumentation amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA128P | Lower offset (25µV max), higher CMRR (120dB), but requires dual ±15V supply minimum and lacks ±40V input protection | Better for lab-grade metrology; unsuitable for field-deployed train control where input transients occur | Select INA128P only when absolute DC accuracy outweighs ruggedness requirements |
| AD620ARZ | Wider bandwidth (120kHz at G=10), lower noise (9nV/√Hz), but higher offset drift (1µV/°C) and no integrated overvoltage protection | Preferred for high-speed data acquisition; requires external protection for industrial sensor interfaces | Choose AD620ARZ when signal bandwidth >100kHz is critical and PCB space allows discrete protection |
Compared with INA128P and AD620ARZ, the INA114BPG4 trades marginal DC precision and bandwidth for robustness - its ±40V input tolerance, 0.3µV/°C drift, and PDIP-8 package simplify design for safety-critical transport and medical systems where field reliability dominates lab-grade specs.
Availability
INA114BPG4 is available at Aetrix Electronics and suitable for surgical equipment interfaces, train control and management systems, actuator feedback loops, and multifunction relay monitoring requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for INA114BPG4 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 INA114 belongs to TI's precision instrumentation amplifier product line, engineered specifically for industrial process control, medical diagnostics, and transportation systems demanding high CMRR, low drift, and field-hardened input protection.
FAQ
What is the maximum gain achievable with the INA114BPG4?
The INA114BPG4 supports gains from 1 to 10,000 V/V, set by a single external resistor using the equation G = 1 + 50kΩ/RG. At G=10,000, RG = 5Ω - requiring careful layout to minimize parasitic resistance. The INA114BPG4 maintains specified CMRR and linearity up to G=1000; higher gains increase sensitivity to resistor tolerance and thermal EMFs.
Does the INA114BPG4 require external capacitors for stability?
Yes, the INA114BPG4 requires local 0.1µF ceramic decoupling capacitors between V+ and V− pins and ground, placed within 5mm of the device. Additional 10µF bulk capacitance is recommended on each supply rail. The INA114BPG4 remains stable with load capacitance up to 1000pF, but larger capacitive loads may require series isolation resistance per TI Application Report SBAA345.
Can the INA114BPG4 operate from a single 5V supply?
Yes, the INA114BPG4 supports single-supply operation from +4.5V to +36V. When using +5V, the input common-mode range is limited to 1.5V to 3.5V, and output swing is constrained to approximately 1V to 4V. Reference pin (Pin 1) must be biased to mid-supply (e.g., 2.5V) via a low-impedance source to maintain CMRR - the INA114BPG4 does not include internal level-shifting circuitry.
What is the purpose of Pin 8 (NC) on the INA114BPG4 PDIP package?
Pin 8 on the INA114BPG4 is designated NC (No Connect) and is internally unconnected. TI's mechanical drawings and SBOS014B datasheet explicitly state it must remain unconnected - routing traces or applying voltage to Pin 8 risks internal latch-up or parametric shift. This differs from SOIC-16 variants where Pin 12 serves as output sense; the INA114BPG4 PDIP version has no output sense function.
How does input overvoltage protection work on the INA114BPG4?
The INA114BPG4 incorporates internal series current-limiting diodes on both inputs, clamping fault currents to ~1.5mA during ±40V overvoltage events - whether applied differentially or common-mode. Protection remains active even with no power applied. This eliminates need for external TVS diodes in most industrial sensor interfaces, though sustained overvoltage beyond datasheet limits risks permanent degradation of the protection network.
INA114BPG4 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:
- 0.6V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 1 MHz
- Current - Input Bias:
- 500 pA
- Voltage - Input Offset:
- 10 µV
- Current - Supply:
- 2.2mA
- Current - Output / Channel:
- 20 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
INA114BPG4 FAQ
1.How can I place an order for INA114BPG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for INA114BPG4 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 INA114BPG4 reliable?
The price and inventory of INA114BPG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA114BPG4 is usually 5 days.
3.What payment methods are accepted for INA114BPG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA114BPG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA114BPG4?
INA114BPG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA114BPG4 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 INA114BPG4?
For technical support, including INA114BPG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA114BPG4 requirements.
6.How does Aetrix verify that INA114BPG4 is sourced from the original manufacturer or authorized distributors?
All INA114BPG4 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 INA114BPG4 meets industry standards.
7.What is the process for return or replacement of INA114BPG4?
All INA114BPG4 units undergo pre-shipment inspection (PSI). If there is an issue with INA114BPG4, 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 INA114BPG4 part is unused and in its original packaging.
Return procedure for INA114BPG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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