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Texas Instruments INA105KU/2K5G4
- Part No.:
- INA105KU/2K5G4
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
INA105KU/2K5G4.pdf
- Description:
- IC OPAMP DIFF 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,907
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Product details
Overview
INA105KU/2K5G4 from Texas Instruments is a precision unity-gain differential amplifier IC used for high-accuracy signal conditioning in measurement systems. It delivers 72dB minimum CMRR, ±0.025% maximum gain error, 1MHz bandwidth, and operates on ±5V to ±18V supplies - enabling accurate voltage difference extraction in battery test equipment and industrial sensor interfaces.
For engineers reviewing the INA105KU/2K5G4 datasheet, INA105KU/2K5G4 pinout, INA105KU/2K5G4 application, or INA105KU/2K5G4 equivalent, key selection criteria include guaranteed CMRR over temperature, laser-trimmed resistor matching, rail-to-rail common-mode input range (±20V at ±15V supply), and SOIC-8 packaging compatibility with automated assembly.
Technical Context
The INA105KU/2K5G4 integrates a precision bipolar op amp with four 25kΩ laser-trimmed thin-film resistors on a single die, forming a fixed G = 1 differential amplifier topology. Its internal resistor network ensures ratio-matched tracking (TCR-matched) to maintain CMRR and gain accuracy across –40°C to +85°C.
It supports single-supply (10–36V) and dual-supply (±5V to ±18V) operation, with input common-mode range extending beyond rails (±20V at ±15V supply). The Ref pin enables offset nulling, while Sense and Output pins support precision feedback configurations beyond basic differencing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Accuracy | ±0.025% max - ensures sub-0.1mV error in 1V differential input, critical for calibration-grade instrumentation. |
| CMRR | 72dB min (–40°C to +85°C) - rejects >99.9% of common-mode noise in noisy industrial environments. |
| Offset Voltage | 500μV max - eliminates need for external trimming in low-level sensor signal chains (e.g., strain gauges). |
| Bandwidth | 1MHz typical - supports fast transient capture in servo position feedback and battery cell voltage monitoring. |
| Input Voltage Range | ±20V common-mode at ±15V supply - accommodates signals exceeding supply rails without external attenuation. |
| Supply Range | ±5V to ±18V dual or 10–36V single - enables flexible power architecture in portable and industrial equipment. |
| Output Impedance | 0.01Ω - drives 10kΩ loads with negligible gain loss; stable with ≤1000pF capacitive load. |
Pinout & Package
INA105KU/2K5G4 is supplied in an 8-pin SOIC package (D package), measuring 4.90mm × 6.00mm, with standard JEDEC MS-012AC footprint and gull-wing leads compatible with reflow soldering.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| +In (Pin 3) | Noninverting input | 25kΩ laser-trimmed resistor to op amp noninverting terminal; defines positive leg of differential pair. |
| –In (Pin 2) | Inverting input | 25kΩ laser-trimmed resistor to op amp inverting terminal; defines negative leg of differential pair. |
| Output (Pin 6) | Main output | Amplified difference between +In and –In, referenced to Ref pin potential. |
| Ref (Pin 1) | Reference input | 25kΩ resistor to op amp noninverting terminal; sets output DC level (e.g., ground or bias voltage). |
| V+ (Pin 7) | Positive supply | Highest potential supply rail; supports up to +18V in dual-supply mode. |
| V– (Pin 4) | Negative supply | Lowest potential supply rail; supports down to –18V in dual-supply mode. |
| Sense (Pin 5) | Sense input | 25kΩ resistor to op amp inverting terminal; enables precision current sensing and feedback configurations. |
| NC (Pin 8) | No connection | Internally unconnected; must be left floating - not tied to ground or supply. |
Key Features
| Feature | Design Value |
|---|---|
| Laser-trimmed 25kΩ resistor network | Ensures <0.01% resistor ratio match, directly enabling 72dB CMRR without external calibration. |
| Rail-to-rail common-mode input range | Accepts inputs up to ±20V with ±15V supply - eliminates need for external level-shifting in high-voltage sensor interfaces. |
| Offset voltage adjustment via Ref pin | Allows precise nulling of system offset using <10Ω source impedance, maintaining CMRR integrity. |
| Stable with capacitive loads ≤1000pF | Enables direct driving of ADC input filters or long cables without external isolation components. |
| Bipolar process with low 1/f noise | Delivers 2.4µVPP (0.01Hz–10Hz) and 50–60nV/√Hz (10kHz), supporting high-resolution DC-coupled measurements. |
Applications
| Battery Cell Formation & Test Equipment | Sensor Tag & Data Logger |
|---|---|
Use Scenario: High-precision voltage monitoring during charge/discharge cycling of Li-ion cells under thermal stress. IC Role / Device Role / Timing Role: Differential amplifier extracting cell voltage while rejecting pack-level common-mode noise and ground shifts. Use Value: ±0.025% gain error and 72dB CMRR ensure <1mV absolute accuracy over temperature, meeting ISO 16750-4 test compliance. |
Use Scenario: Low-power analog front-end for environmental sensors (temperature, humidity, pressure) in wireless edge nodes. IC Role / Device Role / Timing Role: Signal conditioner converting bridge outputs to single-ended ADC inputs with minimal offset drift. Use Value: 20μV/°C offset drift and 5ppm/°C gain drift enable 1-year calibration-free operation in uncontrolled ambient conditions. |
| Servo Drive Position Feedback | Level Transmitter |
Use Scenario: Closed-loop control of motor position using resolver or encoder analog outputs in industrial automation. IC Role / Device Role / Timing Role: Precision difference amplifier isolating position signal from PWM noise and supply ripple. Use Value: 1MHz bandwidth captures fast position transients; ±20V input range accommodates full-scale resolver excitation signals. |
Use Scenario: Analog signal conditioning for 4–20mA loop-powered level sensors in chemical tanks and water treatment plants. IC Role / Device Role / Timing Role: Input stage converting differential sensor output to single-ended reference-grounded signal for current loop driver. Use Value: Ref pin enables programmable zero-point offset; 500μV max VOS ensures <0.01% FS error in 16-bit DAC-based transmitter designs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision differential amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA106KP | Higher grade: 80dB min CMRR, ±0.005% max gain error, –55°C to +125°C operating range. | Required for aerospace or extended-temperature industrial control where INA105KU/2K5G4's 85°C limit is insufficient. | Select INA106KP when full military-grade CMRR stability and wider temperature coverage are mandatory. |
| AD629ARZ | 500V common-mode range, 100dB CMRR, but lower bandwidth (500kHz) and higher quiescent current (1.2mA vs 2mA). | Suitable for high-voltage motor phase current sensing where INA105KU/2K5G4's ±20V input range is inadequate. | Choose AD629ARZ only when >100V common-mode rejection is required - not a drop-in replacement for INA105KU/2K5G4. |
Compared with INA105KU/2K5G4, INA106KP offers superior CMRR and temperature range at higher cost and same SOIC-8 footprint, while AD629ARZ trades bandwidth and power for extreme common-mode voltage capability - neither is pin-compatible, requiring layout revision.
Availability
INA105KU/2K5G4 is available at Aetrix Electronics and suitable for battery formation systems, industrial data loggers, servo feedback circuits, and 4–20mA level transmitters requiring stable component supply and long-term calibration consistency.
Supply support for INA105KU/2K5G4 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, embedded processing, and connectivity technologies, with decades of heritage in precision amplifiers and signal chain solutions.
The INA105KU/2K5G4 belongs to TI's precision differential amplifier product line, designed specifically for high-accuracy, low-drift measurement systems where laser-trimmed resistor matching replaces costly discrete networks.
FAQ
What is the maximum common-mode input voltage for INA105KU/2K5G4?
The INA105KU/2K5G4 supports a common-mode input voltage range of ±20V when operated with ±15V supplies. This rail-to-rail capability allows direct interfacing with high-voltage sensor outputs without external attenuation. At other supply voltages, the range scales proportionally - e.g., ±12V supplies support ±16V common-mode input. Exceeding these limits risks damage or degraded CMRR.
Can INA105KU/2K5G4 operate from a single supply?
Yes, INA105KU/2K5G4 supports single-supply operation from 10V to 36V. In this configuration, V– is connected to ground, V+ to the positive rail, and the Ref pin is biased to mid-supply (e.g., V+/2) to establish proper output swing. Performance parameters such as CMRR and offset remain within datasheet specifications, though full-scale output swing is reduced compared to dual-supply use.
How does the Sense pin (Pin 5) function in INA105KU/2K5G4?
The Sense pin (Pin 5) connects to a 25kΩ laser-trimmed resistor tied to the op amp's inverting input. It enables advanced configurations like precision current sensing, summing amplifiers, and gain-adjustable topologies. Unlike the standard –In pin, Sense provides an additional feedback path that preserves resistor matching integrity - critical for maintaining CMRR when modifying gain or adding external compensation.
Is INA105KU/2K5G4 RoHS compliant and lead-free?
Yes, INA105KU/2K5G4 is RoHS compliant and lead-free per TI's official packaging documentation. The SOIC-8 (D) package uses matte tin lead finish, meets JEDEC J-STD-020 moisture sensitivity level 3 (MSL-3), and is qualified for lead-free reflow soldering profiles up to 260°C peak temperature. Full compliance documentation is available in TI's PCN #SLYA052.
What is the purpose of the NC pin (Pin 8) on INA105KU/2K5G4?
Pin 8 is a true no-connect terminal with no internal bond wire or silicon connection. It must be left electrically floating - not tied to ground, supply, or any other node. Connecting Pin 8 may introduce parasitic coupling or mechanical stress affecting adjacent pins. TI explicitly states in the datasheet that NC pins "can be left floating," and PCB layout should avoid routing traces or copper pours near this pin.
INA105KU/2K5G4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Amplifier Type:
- Differential
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 3V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 1 MHz
- Current - Input Bias:
- -
- Voltage - Input Offset:
- 50 µV
- Current - Supply:
- 1.5mA
- Current - Output / Channel:
- 20 mA
- Voltage - Supply Span (Min):
- 10 V
- Voltage - Supply Span (Max):
- 36 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
INA105KU/2K5G4 FAQ
1.How can I place an order for INA105KU/2K5G4 through Aetrix?
Please submit a Request for Quotation (RFQ) for INA105KU/2K5G4 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 INA105KU/2K5G4 reliable?
The price and inventory of INA105KU/2K5G4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA105KU/2K5G4 is usually 5 days.
3.What payment methods are accepted for INA105KU/2K5G4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA105KU/2K5G4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA105KU/2K5G4?
INA105KU/2K5G4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA105KU/2K5G4 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 INA105KU/2K5G4?
For technical support, including INA105KU/2K5G4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA105KU/2K5G4 requirements.
6.How does Aetrix verify that INA105KU/2K5G4 is sourced from the original manufacturer or authorized distributors?
All INA105KU/2K5G4 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 INA105KU/2K5G4 meets industry standards.
7.What is the process for return or replacement of INA105KU/2K5G4?
All INA105KU/2K5G4 units undergo pre-shipment inspection (PSI). If there is an issue with INA105KU/2K5G4, 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 INA105KU/2K5G4 part is unused and in its original packaging.
Return procedure for INA105KU/2K5G4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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