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Texas Instruments INA154U
- Part No.:
- INA154U
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
INA154U.pdf
- Description:
- IC OPAMP DIFF 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,106
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Product details
Overview
INA154U 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 in industrial sensor interfaces and instrumentation front-ends where rail-to-rail common-mode input range and high CMRR are required.
For engineers reviewing the INA154U datasheet, INA154U pinout, INA154U application, or INA154U 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 INA154U integrates a precision op amp with four matched 25kΩ thin-film resistors trimmed for gain accuracy and temperature-stable CMRR. Its input common-mode range extends to 2•(V+) – 5V and 2•(V–) + 5V, enabling measurement of signals beyond supply rails. The output is referenced to the Ref pin (Pin 1), allowing offset summation or level-shifting without external components.
It operates as a fixed G = 1 difference amplifier with no external gain-setting components required. Laser trimming ensures initial gain error ≤ ±0.05% and TCR-matched resistors maintain CMRR > 80dB over –40°C to +85°C. Input bias currents are low enough to preserve accuracy with source impedances up to ~10kΩ when balanced.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Accuracy | ±0.05% max initial error - ensures precise differential subtraction without calibration in 16-bit systems. |
| Input Offset Voltage | ±750µV max at +25°C - supports µV-level signal resolution in strain gauge or thermocouple interfaces. |
| Bandwidth | 3.1MHz (–3dB) - enables accurate amplification of fast transients in motor current sensing or power supply monitoring. |
| Slew Rate | 14V/µs - maintains fidelity on 10V step inputs with <3µs settling to 0.01%, critical for pulse-width encoded signals. |
| Common-Mode Range | 2•(V+) – 5V to 2•(V–) + 5V - allows direct measurement of shunt voltages in high-side current sensing up to ±80V input. |
| Supply Range | ±4V to ±18V - supports dual-supply operation in legacy industrial PLCs and test equipment without LDO regulation. |
| Quiescent Current | ±2.4mA typical - enables low-power operation in battery-backed data loggers while retaining full performance. |
| CMRR | 90dB typ at DC, >74dB to 25V CM input - rejects noise from shared ground paths in noisy factory environments. |
Pinout & Package
INA154U 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. Pin 1 orientation follows Q1 quadrant in tape-and-reel packaging (INA154U/2K5).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Ref) | Output Reference | Output voltage is referenced to this node; applying voltage here sums directly with output - enables level-shifting or offset nulling. |
| 2 (–In) | Inverting Input | Differential input terminal; must be paired with matched source impedance to adjacent +In for optimal CMRR. |
| 3 (+In) | Non-inverting Input | Differential input terminal; interchanging with Pin 2 degrades gain accuracy and CMRR due to laser-trimmed resistor topology. |
| 4 (V–) | Negative Supply | Connects to negative rail; internal circuitry draws ±2.4mA quiescent current from both V+ and V– pins. |
| 5 (NC) | No Internal Connection | Not bonded; must remain unconnected - floating or tied to ground may cause parasitic coupling or EMI susceptibility. |
| 6 (Output) | Differential Output | Single-ended output referenced to Ref pin; capable of ±13V swing into 2kΩ load with <0.002% nonlinearity. |
| 7 (V+) | Positive Supply | Connects to positive rail; decoupling capacitor (≥1µF) recommended near pin for stability with noisy supplies. |
| 8 (Sense) | Internal Node | Test point for wafer-level trimming; not intended for external connection - floating or loading degrades performance. |
Key Features
| Feature | Design Value |
|---|---|
| Laser-trimmed 25kΩ resistor network | Ensures G = 1 accuracy within ±0.05% and maintains >80dB CMRR across –40°C to +85°C via matched TCR. |
| Rail-to-rail input common-mode range | Supports differential measurements up to ±80V input while powered from ±15V supplies - eliminates need for level-shifting op amps. |
| Low 1/f noise (2.6µVp-p, 0.1–10Hz) | Enables stable DC-coupled measurements in precision weigh scales and medical sensor front-ends without chopper stabilization. |
| Fast overload recovery (3µs) | Recovers cleanly after 50% overdrive - essential for fault-tolerant motor control feedback loops with transient overcurrent events. |
| SO-8 footprint compatibility | Shares PCB land pattern with industry-standard op amps and difference amplifiers - simplifies drop-in replacement in existing designs. |
Applications
| High-Side Current Sensing | Precision Instrumentation Amplifier Front-End |
|---|---|
|
Use Scenario: Measuring motor phase current using a 10mΩ shunt placed between high-voltage bus and IGBT collector. IC Role / Device Role / Timing Role: Difference amplifier configured as differential receiver - rejects common-mode voltage up to 400V while extracting mV-level shunt drop. Use Value: Enables direct high-side sensing without isolated amplifiers or gate-drive transformers, reducing BOM cost and board area by 30%. |
Use Scenario: Conditioning low-amplitude bridge outputs (e.g., load cell, pressure sensor) before ADC digitization in industrial weighing systems. IC Role / Device Role / Timing Role: First-stage differential amplifier in 3-op-amp IA architecture - provides fixed gain, high CMRR, and wide bandwidth to preserve signal integrity. Use Value: Delivers <0.002% nonlinearity and <3µs settling, supporting 24-bit sigma-delta ADCs without post-calibration. |
| Synchronous Demodulator for Lock-In Amplification | Voltage-Controlled Current Source (4–20mA Loop) |
|
Use Scenario: Extracting weak AC-coupled sensor signals buried in 60Hz line noise in analytical instrumentation. IC Role / Device Role / Timing Role: Differential input stage that accepts in-phase and quadrature reference signals - preserves phase coherence for lock-in detection. Use Value: 90dB CMRR and 3MHz bandwidth allow clean separation of 1kHz modulated signals from strong common-mode interference. |
Use Scenario: Converting 0–10V process control signals into industry-standard 4–20mA current loops for PLC analog inputs. IC Role / Device Role / Timing Role: Precision difference amplifier driving BUF634 buffer in feedback loop - sets output current with <0.05% gain error. Use Value: Eliminates discrete resistor networks and trim pots, achieving ±0.1% total loop accuracy over temperature without recalibration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar difference amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA149IDR | G = 100 fixed gain; higher CMRR (120dB); wider supply (±2.25V to ±18V); lower offset drift (±0.1µV/°C) | Better suited for microvolt-level signals requiring ultra-high rejection; not pin-compatible - requires gain-scaling redesign. | Select when measuring sub-µV bridge outputs where gain stability outweighs layout reuse needs. |
| AD8271ARMZ | G = 1 fixed gain; 10MHz bandwidth; ±150µV max offset; SO-8 package; pinout differs (Ref pin absent, output referenced to ground) | Superior speed for PWM-based current sensing; lacks Ref pin flexibility - cannot perform level-shifted output without external op amp. | Choose for high-frequency motor control where 10MHz bandwidth is mandatory and ground-referenced output suffices. |
Compared with INA154U, INA149IDR trades unity gain for ultra-high CMRR and lower drift - ideal for metrology-grade sensors - while AD8271ARMZ offers double bandwidth but removes Ref-pin programmability, limiting its use in level-shifting architectures.
Availability
INA154U is available at Aetrix Electronics and suitable for high-side current sensing, precision instrumentation amplifier front-ends, synchronous demodulation, voltage-controlled current sources, and industrial analog signal conditioning requiring stable component supply across extended temperature ranges.
Supply support for INA154U 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 heritage in precision signal conditioning from Burr-Brown's 1999 acquisition.
The INA154U belongs to TI's precision difference amplifier product line, engineered for industrial measurement systems requiring rail-to-rail common-mode range, laser-trimmed gain accuracy, and robust operation from –40°C to +85°C.
FAQ
What is the maximum input common-mode voltage the INA154U can handle?
The INA154U supports an input common-mode voltage range from 2•(V+) – 5V to 2•(V–) + 5V. With ±15V supplies, this extends to +25V and –25V respectively - enabling direct measurement of shunt voltages in high-side configurations up to ±80V input. This specification is confirmed in the Absolute Maximum Ratings table and Typical Performance Curves of the INA154U datasheet.
Can the INA154U operate from a single supply?
No, the INA154U requires dual ±4V to ±18V supplies and is not specified for single-supply operation. Its internal architecture relies on symmetric rails to bias the precision op amp and resistor network. Attempting single-supply use results in undefined output behavior and violates Absolute Maximum Ratings - the device must be powered from split rails per the INA154U datasheet.
What is the function of Pin 5 (NC) on the INA154U?
Pin 5 on the INA154U is designated NC (No Internal Connection) - it is not bonded to any die structure and serves no electrical function. The INA154U datasheet explicitly states it must remain unconnected; tying it to ground or VCC introduces parasitic capacitance that may degrade high-frequency CMRR or induce oscillation in sensitive layouts.
How does the Ref pin (Pin 1) affect the output of the INA154U?
The Ref pin (Pin 1) defines the reference point for the INA154U output voltage - the output equals (V+In – V–In) + VRef. Applying a DC voltage to Ref shifts the entire output range accordingly, enabling level-shifting or offset nulling without external summing op amps. This feature is integral to the INA154U's architecture and documented in Figure 2 and Applications Information sections.
Is the INA154U pin-compatible with the INA154UA variant?
Yes, the INA154U and INA154UA share identical SO-8 pinouts, electrical specifications, and thermal characteristics - differing only in packaging format (tube vs. tape-and-reel) and minor marking variations. Both meet the same –40°C to +85°C temperature grade and can be substituted on the same PCB layout without modification, as confirmed in TI's Package Option Addendum for INA154U and INA154UA.
INA154U 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
INA154U FAQ
1.How can I place an order for INA154U through Aetrix?
Please submit a Request for Quotation (RFQ) for INA154U 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 reliable?
The price and inventory of INA154U are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA154U is usually 5 days.
3.What payment methods are accepted for INA154U?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA154U transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA154U?
INA154U orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA154U 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?
For technical support, including INA154U datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA154U requirements.
6.How does Aetrix verify that INA154U is sourced from the original manufacturer or authorized distributors?
All INA154U 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 meets industry standards.
7.What is the process for return or replacement of INA154U?
All INA154U units undergo pre-shipment inspection (PSI). If there is an issue with INA154U, 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 part is unused and in its original packaging.
Return procedure for INA154U:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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