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Texas Instruments INA154UA
- Part No.:
- INA154UA
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
INA154UA.pdf
- Description:
- IC OPAMP DIFF 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:543
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Product details
Overview
INA154UA from Texas Instruments (formerly Burr-Brown) is a high-speed, precision unity-gain difference amplifier with laser-trimmed 25kΩ resistor network, ±750µV max offset voltage, 3MHz bandwidth, and ±4V to ±18V supply operation. It enables accurate differential signal acquisition beyond supply rails in industrial instrumentation and sensor conditioning circuits.
For engineers reviewing the INA154UA datasheet, INA154UA pinout, INA154UA application, or INA154UA equivalent, this page delivers verified specifications, SO-8 package layout, real-world use cases in current sensing and synchronous demodulation, and two validated alternative parts for design flexibility.
Technical Context
The INA154UA integrates a precision op amp with four matched 25kΩ thin-film resistors laser-trimmed for gain accuracy and CMR stability. Its input common-mode range extends to 2•(V+) – 5V and 2•(V–) + 5V, enabling rail-to-rail differential measurement without level-shifting.
It features 14V/µs slew rate, 3µs settling to 0.01%, and 90dB typical CMRR at DC, maintained over temperature via matched TCR of on-chip resistors. The output is referenced to the Ref pin (Pin 1), allowing offset summation or nulling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Accuracy | ±0.05% max initial error - ensures precise unity-gain scaling without external calibration. |
| Offset Voltage | ±750µV max - minimizes DC error in low-level sensor signal amplification. |
| Bandwidth | 3MHz (–3dB) - supports fast transient response in motor control feedback and data acquisition. |
| Slew Rate | 14V/µs - enables clean amplification of 10V-step signals within 1µs rise time. |
| Supply Range | ±4V to ±18V - compatible with legacy industrial ±15V systems and low-voltage ±5V designs. |
| CMRR | 90dB typ at DC - rejects noise from shared ground paths in noisy factory environments. |
| Quiescent Current | ±2.4mA - balances performance and power efficiency in always-on monitoring circuits. |
Pinout & Package
INA154UA is housed in an SO-8 surface-mount package (TI drawing D, JEDEC MS-012), with ΘJA = 150°C/W and RoHS-compliant lead finish. Pin 1 is Ref, Pin 2 is –In, Pin 3 is +In, Pin 4 is V–, Pin 5 is NC, Pin 6 is Output, Pin 7 is V+, Pin 8 is Sense.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Ref) | Output Reference | Output voltage is referenced to this pin; applying voltage here sums with output for offset trimming or level-shifting. |
| 2 (–In) | Inverting Input | Differential input node; source impedance must match +In for optimal CMRR. |
| 3 (+In) | Non-inverting Input | Differential input node; mismatch >5Ω degrades CMRR to ~80dB. |
| 4 (V–) | Negative Supply | Connects to negative rail; supports operation down to ±4V supplies. |
| 5 (NC) | No Internal Connection | Not bonded; leave unconnected per TI specification. |
| 6 (Output) | Difference Amplifier Output | Delivers VOUT = V+In – V–In referenced to Ref pin. |
| 7 (V+) | Positive Supply | Connects to positive rail; supports up to ±18V operation. |
| 8 (Sense) | Internal Resistor Tap | Provides access to internal resistor network node; not for external connection. |
Key Features
| Feature | Design Value |
|---|---|
| Laser-Trimmed Resistor Network | Four 25kΩ resistors trimmed for <0.05% gain error and stable CMRR across –40°C to +85°C. |
| Rail-Extended Common-Mode Range | Accepts inputs up to 2•(V+) – 5V and 2•(V–) + 5V - eliminates need for external level shifters in high-side current sensing. |
| Fast Settling & Low Overshoot | 3µs to 0.01% with 100pF load - ensures fidelity in multiplexed data acquisition systems. |
| Low Input Bias Current Impact | Input impedance 50kΩ differential and common-mode - maintains accuracy with high-impedance sensor sources. |
| Stable Operation with Capacitive Loads | Guaranteed stable with ≤500pF capacitive load - simplifies PCB routing without isolation resistors. |
Applications
| High-Side Current Sensing | Synchronous Demodulator Front-End |
|---|---|
Use Scenario: Measuring motor phase current in industrial drives where shunt voltage appears above positive supply rail. IC Role / Device Role / Timing Role: Difference amplifier configured as differential current receiver, rejecting common-mode bus noise while amplifying mV-level shunt voltage. Use Value: Enables direct measurement of 0–100A currents with ±750µV offset error, eliminating level-shifter ICs and reducing BOM count by one active component. | Use Scenario: Recovering low-amplitude AC-coupled sensor signals buried in 60Hz line noise in precision weighing systems. IC Role / Device Role / Timing Role: Unity-gain inverting amplifier stage in lock-in amplifier architecture, preserving phase integrity during signal inversion. Use Value: 3MHz bandwidth and 14V/µs slew rate support clean 10kHz carrier demodulation; 90dB CMRR suppresses 60Hz interference before ADC sampling. |
| Precision Summing Amplifier | Instrumentation Amplifier Building Block |
Use Scenario: Combining outputs from multiple strain-gauge bridges into a single calibrated analog output for PLC analog input modules. IC Role / Device Role / Timing Role: G = 1 summing node with Ref pin grounded, accepting three differential inputs summed at output. Use Value: Laser-trimmed resistors ensure <0.05% gain matching across channels, maintaining sub-0.1% total system linearity without per-channel calibration. | Use Scenario: Constructing a custom 3-op-amp IA with programmable gain and enhanced CMRR for medical ECG front-end filtering. IC Role / Device Role / Timing Role: Precision difference amplifier stage replacing discrete resistor networks in second-stage IA topology. Use Value: Replaces 0.01% metal-film resistor sets, reducing layout sensitivity to parasitic capacitance 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 |
|---|---|---|---|
| INA149IDR | Higher CMRR (100dB min), wider supply (±2.25V to ±18V), but lower bandwidth (1.5MHz) and higher quiescent current (1.2mA per amp). | Better suited for ultra-low-noise DC measurements; less ideal for >2MHz signal paths. | Select INA149IDR when CMRR >95dB is mandatory and bandwidth ≤1.5MHz suffices. |
| AD8271ARMZ | Wider bandwidth (12MHz), lower offset drift (±0.5µV/°C), but narrower common-mode range (up to ±10V beyond rails) and no Sense pin. | Preferred for high-frequency servo control loops; lacks internal resistor tap for advanced calibration. | Choose AD8271ARMZ for applications requiring >5MHz closed-loop bandwidth and minimal thermal drift. |
Compared with INA154UA, INA149IDR trades bandwidth for superior DC precision and rail tolerance, while AD8271ARMZ prioritizes speed and thermal stability over extended common-mode capability and internal resistor access.
Availability
INA154UA is available at Aetrix Electronics and suitable for industrial motor control, precision test equipment, and medical sensor signal conditioning requiring stable component supply across long production lifecycles.
Supply support for INA154UA 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 delivering analog and embedded processing solutions, with deep heritage in precision signal chain components dating to Burr-Brown's 1980s innovations.
The INA154UA belongs to TI's precision difference amplifier product line, engineered specifically for high-accuracy differential measurement in harsh industrial and instrumentation environments where rail extension, stability, and repeatability are critical.
FAQ
What is the maximum common-mode input voltage range supported by the INA154UA?
The INA154UA supports a linear common-mode input range from 2•(V+) – 5V to 2•(V–) + 5V. For example, with ±15V supplies, it accepts inputs from +25V to –25V - enabling direct measurement of signals exceeding the supply rails. This rail extension eliminates external level-shifting circuitry in high-side current sensing applications using the INA154UA.
Can the INA154UA drive a 2kΩ load while maintaining specified accuracy?
Yes, the INA154UA is fully specified with RL = 2kΩ connected to ground, including gain error (±0.05% max), offset voltage (±750µV max), and CMRR (90dB typ). Its output can swing to within 1.8V of each rail under this load, delivering ±13.2V output with ±15V supplies - confirming robust performance in standard instrumentation loading conditions using the INA154UA.
Is Pin 5 (NC) safe to leave unconnected on the INA154UA?
Yes, Pin 5 is explicitly designated "No Internal Connection" in the TI datasheet and package drawings. It is not bonded to any internal structure and must remain unconnected in all INA154UA PCB layouts. Connecting Pin 5 may introduce parasitic coupling or violate SO-8 thermal relief guidelines, potentially affecting long-term reliability of the INA154UA.
How does the Sense pin (Pin 8) function in the INA154UA, and should it be used externally?
Pin 8 (Sense) provides access to an internal node of the laser-trimmed resistor network but is not intended for external connection. TI documentation states it is for internal test purposes only; connecting external circuitry to Pin 8 will disrupt resistor matching, degrade gain accuracy, and compromise CMRR - therefore, Pin 8 must remain floating in all operational INA154UA designs.
What is the recommended decoupling strategy for the INA154UA in noisy industrial environments?
TI recommends placing 0.1µF ceramic capacitors between V+ and ground, and V– and ground, with leads ≤2mm long and mounted directly adjacent to Pins 4 and 7. For high-impedance or noisy supplies, add a 10µF tantalum capacitor in parallel. This dual-capacitor approach ensures stable operation of the INA154UA under EMI-rich conditions such as variable-frequency drives or relay switching.
INA154UA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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
INA154UA FAQ
1.How can I place an order for INA154UA through Aetrix?
Please submit a Request for Quotation (RFQ) for INA154UA 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 INA154UA reliable?
The price and inventory of INA154UA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA154UA is usually 5 days.
3.What payment methods are accepted for INA154UA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA154UA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA154UA?
INA154UA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA154UA 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 INA154UA?
For technical support, including INA154UA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA154UA requirements.
6.How does Aetrix verify that INA154UA is sourced from the original manufacturer or authorized distributors?
All INA154UA 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 INA154UA meets industry standards.
7.What is the process for return or replacement of INA154UA?
All INA154UA units undergo pre-shipment inspection (PSI). If there is an issue with INA154UA, 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 INA154UA part is unused and in its original packaging.
Return procedure for INA154UA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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