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Texas Instruments INA143U/2K5
- Part No.:
- INA143U/2K5
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
INA143U/2K5.pdf
- Description:
- IC OPAMP DIFF 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,945
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Product details
Overview
INA143U/2K5 from Texas Instruments (originally Burr-Brown) is a precision, high-speed difference amplifier with fixed gain options of G = 10 V/V or G = 0.1 V/V. It features ±250 µV max input offset voltage, 5 V/µs slew rate, 9 µs settling time to 0.01%, ±2.25 V to ±18 V dual-supply operation, and SO-8 surface-mount packaging - used in differential line receivers, synchronous demodulators, and battery-powered instrumentation.
For engineers reviewing the INA143U/2K5 datasheet, INA143U/2K5 pinout, INA143U/2K5 application, or INA143U/2K5 equivalent, key selection criteria include guaranteed gain accuracy (±0.01% initial error), rail-to-rail input common-mode range beyond supplies, low quiescent current (950 µA), and stable operation with up to 1000 pF capacitive load - critical for precision analog front-ends in industrial sensing and automotive subsystems.
Technical Context
The INA143U/2K5 integrates a precision op amp with laser-trimmed on-chip resistor networks (10 kΩ / 100 kΩ ratios) to achieve accurate, temperature-stable gain and high common-mode rejection (96 dB typ). Its architecture supports both differential-input/differential-output and single-ended output configurations via the reference pin (Pin 1).
It operates across –40°C to +85°C with input common-mode voltage extending beyond supply rails (e.g., up to (V+)–1 V and (V–)+1 V), enabling direct interfacing with overvoltage-tolerant sensors and transducers without external level-shifting circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Options | G = 10 V/V or G = 0.1 V/V - fixed, laser-trimmed ratio ensures no external resistors needed for standard configurations. |
| Input Offset Voltage | ±250 µV max (initial, TA = +25°C) - enables sub-millivolt DC measurement accuracy without trimming. |
| Slew Rate | 5 V/µs - supports fast transient response in motor control feedback or pulse-amplification circuits. |
| Settling Time | 9 µs to 0.01% (10 V step, CL = 100 pF) - suitable for multiplexed data acquisition systems requiring rapid channel settling. |
| Supply Range | ±2.25 V to ±18 V dual or +4.5 V to +36 V single - accommodates wide-range industrial power rails and legacy ±15 V systems. |
| CMRR | 96 dB typical (VCM = –14.85 V to +14.85 V) - maintains signal integrity in noisy environments like motor drives or power converters. |
| Quiescent Current | 950 µA per amplifier - enables low-power portable instrumentation and always-on sensor interfaces. |
Pinout & Package
INA143U/2K5 is housed in an SO-8 (D) surface-mount package (JEDEC MS-012, variation AA), 3.91 mm × 4.90 mm footprint, 1.75 mm max height, with gull-wing leads and Pin 1 quadrant Q1 in tape-and-reel delivery.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Ref) | Output Reference | Bias point for output; applying voltage here sums directly with amplified differential signal - used for offset nulling or level-shifting. |
| 2 (–In) | Inverting Input | Negative input terminal of internal difference amplifier; matched impedance required at both inputs for optimal CMRR. |
| 3 (+In) | Non-inverting Input | Positive input terminal; combined with Pin 2 forms true differential input stage accepting signals beyond supply rails. |
| 4 (V–) | Negative Supply | Connects to negative rail; supports dual-supply operation down to ±2.25 V or single-supply ground reference. |
| 5 (Sense) | Internal Resistor Tap | No external connection - internal node for laser-trimmed resistor network; not user-accessible. |
| 6 (Output) | Differential Output | Single-ended output referenced to Pin 1; delivers G × (V+In – V–In) with rail-swing capability (V+ –1.5 V / V– +0.8 V). |
| 7 (V+) | Positive Supply | Connects to positive rail; enables operation up to ±18 V or +36 V single supply with full specified performance. |
| 8 (NC) | No Connection | Internally unconnected; must remain floating - no tie to ground or supply. |
Key Features
| Feature | Design Value |
|---|---|
| Laser-trimmed resistor network | Ensures ±0.01% gain error and <1 ppm/°C drift - eliminates need for external calibration in production test. |
| Rail-to-rail input common-mode range | Extends 1.1× beyond V+ and V– rails - allows direct interface with ±10 V industrial sensors without attenuators. |
| Stable with 1000 pF capacitive load | Enables direct driving of ADC input filters or long PCB traces without external isolation resistors. |
| Low 950 µA quiescent current | Supports battery life >1 year in 10 µA average-current portable data loggers using duty-cycled sampling. |
| Extended temperature operation | Specified from –40°C to +85°C, functional to –55°C/+125°C - suitable for under-hood automotive and outdoor industrial enclosures. |
Applications
| Industrial Sensor Signal Conditioning | Automotive Differential Line Receiver |
|---|---|
|
Use Scenario: Amplifying low-level bridge sensor outputs (e.g., strain gauges, pressure transducers) in PLC analog input modules. IC Role / Device Role / Timing Role: Precision difference amplifier converting mV-level differential signals into robust 0–10 V single-ended outputs for ADC digitization. Use Value: ±250 µV offset and 96 dB CMRR reject noise from 50/60 Hz mains and switching power supply ripple in factory-floor environments. |
Use Scenario: Receiving differential CAN or LIN bus signals in body control modules where EMI immunity is critical. IC Role / Device Role / Timing Role: High-CMRR differential receiver front-end rejecting common-mode transients induced by alternator noise or load-dump events. Use Value: Input common-mode range beyond supplies allows direct connection to bus lines without clamping diodes or level shifters. |
| Synchronous Demodulator for Lock-in Amplifiers | Battery-Powered Portable Instrumentation |
|
Use Scenario: Extracting weak AC signals buried in noise during precision material analysis or biomedical impedance measurements. IC Role / Device Role / Timing Role: G = 10 difference amplifier synchronized with reference oscillator to amplify modulated sensor outputs before phase-sensitive detection. Use Value: 9 µs settling time and 5 V/µs slew rate support demodulation bandwidths up to 100 kHz without phase distortion. |
Use Scenario: Signal conditioning in handheld multimeters, portable gas analyzers, or field-deployed environmental monitors. IC Role / Device Role / Timing Role: Low-power, rail-compatible amplifier enabling direct sensor interfacing from single 9 V or dual AA batteries. Use Value: 950 µA quiescent current and ±2.25 V minimum supply allow >500-hour operation on two alkaline cells in sleep-active cycling mode. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar difference amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA133UA/2K5 | G = 1 only; higher offset drift (±5 µV/°C vs ±3 µV/°C); same SO-8 package. | Requires external gain-setting resistors for non-unity gains; less suitable for fixed-G=10 signal chains. | Select when unity-gain buffering or programmable gain via external resistors is preferred over integrated precision ratio. |
| AD8271ARMZ | G = 0.2 to 10 (pin-selectable); higher bandwidth (13 MHz vs 0.15 MHz); 12-bit INL vs 16-bit-equivalent linearity. | Supports variable gain without redesign; better for multi-range instrumentation but higher power (1.2 mA vs 0.95 mA). | Choose when system requires reconfigurable gain or faster small-signal response, accepting trade-offs in DC precision and quiescent current. |
Compared with INA143U/2K5, INA133UA/2K5 offers unity gain only and looser drift specs, while AD8271ARMZ provides wider gain flexibility and bandwidth at the cost of lower DC accuracy and higher supply current - making INA143U/2K5 optimal for cost-sensitive, fixed-gain, low-power precision applications.
Availability
INA143U/2K5 is available at Aetrix Electronics and suitable for industrial sensor interfaces, automotive signal conditioning, and battery-powered instrumentation requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for INA143U/2K5 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 acquired Burr-Brown in 2000 and maintains its precision analog portfolio, emphasizing high-accuracy, low-drift, and robust industrial-grade signal conditioning ICs.
The INA143U/2K5 belongs to TI's legacy difference amplifier product line, designed specifically for cost-effective, high-CMRR analog front-ends in measurement, control, and sensor interface applications where laser-trimmed gain stability is essential.
FAQ
What is the maximum capacitive load the INA143U/2K5 can drive without instability?
The INA143U/2K5 is specified for stable operation with up to 1000 pF capacitive load, as confirmed in the datasheet's "Capacitive Load (stable operation)" parameter (1000 pF). This enables direct connection to anti-aliasing filters or long PCB traces without series isolation resistors - critical for maintaining signal fidelity in data acquisition systems using the INA143U/2K5.
Can the INA143U/2K5 operate from a single +5 V supply?
Yes, the INA143U/2K5 supports single-supply operation from +4.5 V to +36 V. At +5 V, it maintains full functionality including rail-to-rail input common-mode range (e.g., –0.5 V to +5.5 V), 950 µA quiescent current, and ±0.01% gain accuracy - verified in the VS = ±5 V specification table. This makes the INA143U/2K5 suitable for low-voltage portable designs.
How does the Ref pin (Pin 1) function in the INA143U/2K5?
The Ref pin (Pin 1) serves as the output reference node: the output voltage is defined as VOUT = G × (V+In – V–In) + VREF. Applying a voltage here (e.g., 2.5 V) level-shifts the entire output range - used for offset nulling or interfacing with ratiometric ADC references. Source impedance must be <10 Ω to preserve CMRR, as specified in the Applications Information section of the INA143U/2K5 datasheet.
Is the INA143U/2K5 pin-compatible with other members of the INA143 family?
Yes, all SO-8 variants - including INA143U, INA143UA, and INA143U/2K5 - share identical pinout, footprint, and electrical specifications. The "/2K5" suffix denotes tape-and-reel packaging (2500 units/reel), not a functional variant. Thus, INA143U/2K5 is a direct replacement for INA143U in existing designs with no layout or schematic changes required.
What is the guaranteed input offset voltage drift over temperature for the INA143U/2K5?
The INA143U/2K5 guarantees ±3 µV/°C maximum input offset voltage drift over the full –40°C to +85°C operating range, as stated in the "Offset Voltage vs Temperature" row of the ±15 V and ±5 V specification tables. Production distribution data shows most units exhibit ≤2 µV/°C drift, supporting high-accuracy DC measurements across temperature gradients without recalibration.
INA143U/2K5 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- Differential
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 5V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 150 kHz
- Current - Input Bias:
- -
- Voltage - Input Offset:
- 100 µV
- Current - Supply:
- 950µA
- Current - Output / Channel:
- 32 mA
- Voltage - Supply Span (Min):
- 4.5 V
- Voltage - Supply Span (Max):
- 36 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
INA143U/2K5 FAQ
1.How can I place an order for INA143U/2K5 through Aetrix?
Please submit a Request for Quotation (RFQ) for INA143U/2K5 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 INA143U/2K5 reliable?
The price and inventory of INA143U/2K5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA143U/2K5 is usually 5 days.
3.What payment methods are accepted for INA143U/2K5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA143U/2K5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA143U/2K5?
INA143U/2K5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA143U/2K5 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 INA143U/2K5?
For technical support, including INA143U/2K5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA143U/2K5 requirements.
6.How does Aetrix verify that INA143U/2K5 is sourced from the original manufacturer or authorized distributors?
All INA143U/2K5 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 INA143U/2K5 meets industry standards.
7.What is the process for return or replacement of INA143U/2K5?
All INA143U/2K5 units undergo pre-shipment inspection (PSI). If there is an issue with INA143U/2K5, 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 INA143U/2K5 part is unused and in its original packaging.
Return procedure for INA143U/2K5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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