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Texas Instruments INA154U/2K5
- Part No.:
- INA154U/2K5
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
INA154U/2K5.pdf
- Description:
- IC OPAMP DIFF 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,983
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Product details
Overview
INA154U/2K5 from Texas Instruments (formerly Burr-Brown) is a high-speed, precision unity-gain difference amplifier in SO-8 package, featuring ±750µV max offset voltage, 3MHz bandwidth, 14V/µs slew rate, and operation from ±4V to ±18V supplies. It delivers accurate differential signal conditioning for industrial instrumentation and data acquisition systems where rail-to-rail input common-mode range and high CMRR are critical.
For engineers reviewing the INA154U/2K5 datasheet, INA154U/2K5 pinout, INA154U/2K5 application, or INA154U/2K5 equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, application-specific implementation guidance, and two confirmed alternative parts with documented functional and parametric differences.
Technical Context
The INA154U/2K5 integrates a precision op amp with laser-trimmed 25kΩ thin-film resistor network on a single die, enabling exact G = 1 gain and high common-mode rejection (90dB typ at DC). Its input common-mode voltage range extends to 2•(V+) – 5V and 2•(V–) + 5V - beyond supply rails - supporting measurement of signals in high-side current sensing or floating sensor interfaces.
It uses internal matched resistors with excellent TCR tracking to maintain gain accuracy (±0.05% max) and CMRR over temperature (±2µV/°C offset drift). The output is referenced to the Ref pin (Pin 1), allowing flexible level-shifting and offset nulling without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Accuracy | ±0.05% max initial error - ensures <0.1% full-scale measurement error in precision differential sensing without calibration. |
| Input Offset Voltage | ±750µV max - enables sub-millivolt-level differential signal resolution in bridge sensor or shunt-based current measurement. |
| Bandwidth | 3MHz (–3dB) - supports accurate amplification of fast transients up to ~500kHz with minimal phase lag in motor control feedback loops. |
| Slew Rate | 14V/µs - prevents distortion when amplifying high-slew-rate signals such as PWM edges or pulse-width modulated sensor outputs. |
| Supply Range | ±4V to ±18V - allows direct interfacing with legacy ±15V industrial PLC I/O modules and modern ±5V embedded systems. |
| CMRR | 90dB typical at DC - rejects >99.988% of common-mode noise in noisy factory environments with long sensor cables. |
| Quiescent Current | ±2.4mA - enables low-power operation in battery-backed data loggers while maintaining high-speed performance. |
Pinout & Package
INA154U/2K5 is housed in an SO-8 surface-mount package (TI drawing D, JEDEC MS-012), with ΘJA = 150°C/W and MSL Level-3 rating (260°C peak reflow, 168-hour floor life).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Ref) | Output Reference | Output voltage is referenced to this pin; applying voltage here sums directly with output - used for offset nulling or level-shifting. |
| 2 (–In) | Inverting Input | Differential input node; source impedance must match Pin 3 within ≤5Ω to preserve specified CMRR. |
| 3 (+In) | Non-inverting Input | Differential input node; mismatched source impedances degrade CMRR by ≥10dB per 10Ω imbalance. |
| 4 (V–) | Negative Supply | Connects to negative rail; supports operation down to ±4V - enables use with low-voltage analog front-ends. |
| 5 (NC) | No Internal Connection | Unbonded pad; must remain unconnected - routing traces or vias here may cause parasitic coupling or ESD risk. |
| 6 (Output) | Differential Output | Single-ended output referenced to Pin 1; drives loads up to ±60mA with ±13V swing into 2kΩ. |
| 7 (V+) | Positive Supply | Connects to positive rail; supports wide dynamic range with headroom for overshoot in transient-rich environments. |
| 8 (Sense) | Output Sense Feedback | Internal connection to output stage; not user-accessible - used internally for stability compensation and load regulation. |
Key Features
| Feature | Design Value |
|---|---|
| Laser-trimmed resistor network | Enables precise G = 1 gain (±0.05%) and stable CMRR across –40°C to +85°C without external trimming components. |
| Rail-to-rail input common-mode range | Supports differential measurements with inputs extending to 2•(V+) – 5V and 2•(V–) + 5V - ideal for high-side current sensing above V+. |
| Low 3µs settling time (0.01%) | Ensures accurate digitization of fast step events in automated test equipment and high-speed data acquisition systems. |
| SO-8 package with MSL-3 rating | Enables standard SMT assembly in volume production while meeting IPC/JEDEC moisture sensitivity requirements. |
| ±80V absolute maximum input voltage | Allows safe operation with transient overvoltages in industrial fieldbus interfaces and motor drive current sense circuits. |
Applications
| High-Side Current Sensing | Precision Bridge Signal Conditioning |
|---|---|
|
Use Scenario: Measuring motor phase current in industrial inverters using shunt resistors placed between power switch and bus voltage. IC Role / Device Role / Timing Role: Difference amplifier configured as differential receiver, rejecting common-mode bus voltage while amplifying mV-level shunt voltage. Use Value: Enables accurate current feedback with <1% total error over temperature, supporting vector control algorithms requiring tight torque regulation. |
Use Scenario: Extracting microvolt-level strain gauge output in load cell interfaces with long cable runs in factory automation. IC Role / Device Role / Timing Role: Front-end differential amplifier providing gain = 1 and high CMRR before ADC digitization. Use Value: Rejects 60Hz line noise and RFI picked up on cables, preserving <0.01% linearity in 24-bit weigh scale systems. |
| Isolated Sensor Interface | Programmable Gain Instrumentation Amplifier Core |
|
Use Scenario: Interfacing thermocouples or RTDs to isolated ADCs in medical patient monitors where ground loops must be broken. IC Role / Device Role / Timing Role: Differential amplifier driving isolation barrier input, referenced to local ground while rejecting common-mode transients. Use Value: Maintains signal integrity across galvanic isolation with no additional offset drift introduced by external resistor networks. |
Use Scenario: Building custom instrumentation amplifiers with programmable gain stages using discrete op amps and the INA154U/2K5 as input stage. IC Role / Device Role / Timing Role: Precision G = 1 difference amplifier serving as first-stage buffer and common-mode rejection block. Use Value: Eliminates need for matched external resistors, reducing BOM count and improving thermal tracking versus discrete solutions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar difference amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA152U/2K5 | Lower bandwidth (1.2MHz), higher offset drift (±3µV/°C), same SO-8 package and pinout. | Better suited for DC-coupled, low-frequency precision applications like digital multimeters where speed is secondary. | Select INA152U/2K5 only if bandwidth <1.5MHz suffices and cost reduction is prioritized over settling time and AC performance. |
| AD8271ARMZ | G = 0.2 to 10 programmable gain, ±200µV max offset, 10MHz bandwidth, same SO-8 footprint but different pin mapping. | Requires PCB redesign due to non-pin-compatible pinout; preferred for systems needing variable gain without external switching. | Choose AD8271ARMZ when gain flexibility is required and layout revision is acceptable; avoid for drop-in replacement of INA154U/2K5. |
Compared with INA154U/2K5, INA152U/2K5 trades bandwidth and settling speed for lower cost in static-signal applications, while AD8271ARMZ offers programmable gain at the expense of pin compatibility and added complexity in reference and feedback routing.
Availability
INA154U/2K5 is available at Aetrix Electronics and suitable for industrial motor control, precision test equipment, medical sensor interfaces, and factory automation systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for INA154U/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 signal conditioning for industrial, medical, and test & measurement markets.
The INA154U/2K5 belongs to TI's legacy precision difference amplifier product line, designed specifically for applications demanding rail-to-rail input range, laser-trimmed gain accuracy, and robust common-mode rejection in harsh electrical environments.
FAQ
What is the absolute maximum input voltage rating for the INA154U/2K5?
The INA154U/2K5 has an absolute maximum input voltage rating of ±80V, independent of supply voltage. This allows safe operation in high-common-mode applications such as motor phase current sensing or isolated sensor front-ends where transient overvoltages may occur. Exceeding this rating risks permanent damage to the internal resistor network or input stage, even if supply rails remain within operating range.
Can the INA154U/2K5 operate from a single supply?
No, the INA154U/2K5 requires dual supplies (±4V to ±18V) and does not support true single-supply operation. Its internal architecture relies on symmetrical biasing and rail-to-rail input capability relative to both V+ and V–. Attempting single-supply use will result in undefined output behavior, clipping, or failure to meet specified offset and CMRR performance.
What is the purpose of the Sense pin (Pin 8) on the INA154U/2K5?
Pin 8 (Sense) on the INA154U/2K5 is an internal output sense connection used for closed-loop stability compensation and load regulation - it is not intended for external connection. Leaving Pin 8 unconnected is mandatory; routing traces or connecting external circuitry to this pin may introduce instability, oscillation, or degraded transient response in the INA154U/2K5 output stage.
How does the Ref pin (Pin 1) affect the output of the INA154U/2K5?
The Ref pin (Pin 1) sets the output reference point: the output voltage equals (V+In – V–In) + VRef. Applying a voltage to Pin 1 directly offsets the output - for example, grounding Pin 1 yields output = V+In – V–In, while applying +2.5V yields output = (V+In – V–In) + 2.5V. Source impedance to Pin 1 must be <10Ω to preserve CMRR.
Is the INA154U/2K5 pin-compatible with the INA154UA/2K5?
Yes, the INA154U/2K5 and INA154UA/2K5 share identical SO-8 pinout, electrical specifications, and package dimensions. The "A" suffix denotes enhanced manufacturing screening (e.g., tighter initial offset distribution), but both variants use the same die, bond wire configuration, and pin mapping - making them fully interchangeable at the PCB level without layout changes.
INA154U/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:
- 14V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 3.1 MHz
- Current - Input Bias:
- -
- Voltage - Input Offset:
- 100 µV
- Current - Supply:
- 2.4mA
- Current - Output / Channel:
- 60 mA
- Voltage - Supply Span (Min):
- 8 V
- Voltage - Supply Span (Max):
- 36 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
INA154U/2K5 FAQ
1.How can I place an order for INA154U/2K5 through Aetrix?
Please submit a Request for Quotation (RFQ) for INA154U/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 INA154U/2K5 reliable?
The price and inventory of INA154U/2K5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA154U/2K5 is usually 5 days.
3.What payment methods are accepted for INA154U/2K5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA154U/2K5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA154U/2K5?
INA154U/2K5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA154U/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 INA154U/2K5?
For technical support, including INA154U/2K5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA154U/2K5 requirements.
6.How does Aetrix verify that INA154U/2K5 is sourced from the original manufacturer or authorized distributors?
All INA154U/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 INA154U/2K5 meets industry standards.
7.What is the process for return or replacement of INA154U/2K5?
All INA154U/2K5 units undergo pre-shipment inspection (PSI). If there is an issue with INA154U/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 INA154U/2K5 part is unused and in its original packaging.
Return procedure for INA154U/2K5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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