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Texas Instruments INA133U/2K5
- Part No.:
- INA133U/2K5
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
INA133U/2K5.pdf
- Description:
- IC OPAMP DIFF 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,965
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Product details
Overview
INA133U/2K5 from Texas Instruments (formerly Burr-Brown) is a precision unity-gain difference amplifier IC with laser-trimmed 25kΩ resistor network, delivering ±0.05% max gain error, 1.5MHz bandwidth, and ±450µV max input offset voltage. It operates from ±2.25V to ±18V supplies and serves as a differential-input building block in battery-powered instrumentation, current sensing, and industrial signal conditioning.
For engineers reviewing the INA133U/2K5 datasheet, INA133U/2K5 pinout, INA133U/2K5 application, or INA133U/2K5 equivalent, key selection criteria include its rail-to-rail input common-mode range (extending beyond supply rails), low quiescent current (950µA), fast 5.5µs settling to 0.01%, and SO-8 surface-mount package compatibility with automated assembly.
Technical Context
The INA133U/2K5 integrates a precision op amp with on-chip, ratio-matched 25kΩ resistors trimmed for high common-mode rejection (90dB typical) and stable gain accuracy over temperature (±5µV/°C max offset drift). Its internal architecture eliminates external resistor matching requirements while maintaining performance across ±2.25V to ±18V dual-supply operation.
Designed for differential signal acquisition, it supports reference-pin-based output level shifting, accepts input common-mode voltages from 2(V–)+3V to 2(V+)-3V, and delivers 5V/µs slew rate with 0.01% settling in 5.5µs under 100pF load - enabling accurate measurement of fast-changing sensor outputs in noisy environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Accuracy | ±0.05% max initial error ensures ≤0.5mV output error at 1V differential input, critical for precision transducer interfaces. |
| Input Offset Voltage | ±450µV max enables sub-millivolt DC measurement resolution without external trimming. |
| Bandwidth | 1.5MHz –3dB small-signal bandwidth supports accurate amplification of kHz-range sensor signals. |
| Slew Rate | 5V/µs allows faithful reproduction of fast transient events such as motor current spikes or pulse-width modulated signals. |
| Supply Range | ±2.25V to ±18V dual supply (or +4.5V to +36V single supply) accommodates wide industrial power architectures. |
| Quiescent Current | 950µA per amplifier enables use in low-power portable and battery-operated systems without thermal compromise. |
| CMRR | 90dB typical maintains signal integrity when rejecting noise common to both inputs - e.g., EMI on long sensor cables. |
Pinout & Package
INA133U/2K5 is housed in an SO-8 surface-mount package (JEDEC MS-012, TI drawing D) with standard 1.27mm pitch and moisture sensitivity level 3 (260°C peak reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Ref) | Reference Input | DC bias point for output; grounding sets output to 0V; applying voltage offsets entire output swing. |
| 2 (–In) | Inverting Input | Differential input node; matched impedance required at both inputs to preserve CMRR. |
| 3 (+In) | Non-inverting Input | Differential input node; source impedance must match that at Pin 2 within 5Ω for >80dB CMRR. |
| 4 (V–) | Negative Supply | Connects to negative rail; supports operation down to ±2.25V supplies. |
| 5 (NC) | No Connection | Internally unconnected; must remain floating - not tied to ground or supply. |
| 6 (Output) | Amplified Output | Single-ended output proportional to (+In) – (–In); capable of ±13.5V swing into 10kΩ load. |
| 7 (V+) | Positive Supply | Connects to positive rail; supports operation up to ±18V supplies. |
| 8 (Sense) | Internal Resistor Tap | Internal connection to resistor network; no external access - not for user routing. |
Key Features
| Feature | Design Value |
|---|---|
| Laser-trimmed resistor network | 25kΩ ratio-matched resistors ensure <0.1% gain error and maintain >80dB CMRR over temperature. |
| Rail-enhanced input range | Common-mode input extends to 2× supply voltage minus 3V - enables direct measurement of signals beyond supply rails. |
| Low-offset, low-drift architecture | ±450µV max offset and ±5µV/°C max drift eliminate need for external nulling in most industrial applications. |
| Fast settling with capacitive drive | Stable with up to 1000pF load and 5.5µs to 0.01% ensures reliable ADC interfacing without external isolation. |
| Wide supply flexibility | Operates from ±2.25V to ±18V dual or +4.5V to +36V single supply - simplifies design across legacy and modern power domains. |
Applications
| Current Sensing in Motor Drives | Precision Transducer Signal Conditioning |
|---|---|
Use Scenario: Measuring bidirectional current through shunt resistor in H-bridge motor control, where common-mode voltage swings near bus rails. IC Role / Device Role / Timing Role: Difference amplifier rejecting high common-mode noise while amplifying mV-level differential shunt voltage. Use Value: Rail-enhanced input range (2×VS−3V) captures full current waveform without clipping; ±0.05% gain error ensures torque accuracy within 0.5%. | Use Scenario: Amplifying low-level output from strain-gauge bridge or RTD interface in industrial pressure/temperature sensors. IC Role / Device Role / Timing Role: Precision differential front-end stage converting microvolt-level bridge imbalance to robust single-ended signal for ADC. Use Value: 90dB CMRR rejects power-supply ripple and EMI; 1.5MHz bandwidth preserves step response of mechanical transients. |
| Battery-Powered Data Acquisition | Automotive Low-Cost Sensor Interface |
Use Scenario: Portable multimeter or handheld test equipment acquiring DC/AC signals with minimal self-heating and long battery life. IC Role / Device Role / Timing Role: Low-quiescent-current (950µA) difference amplifier enabling multi-hour operation on coin-cell or AA batteries. Use Value: Sub-1mA supply current extends runtime; ±450µV offset avoids zero-point calibration drift during field use. | Use Scenario: Engine control unit (ECU) reading analog outputs from oxygen sensors or throttle position sensors in cost-sensitive automotive modules. IC Role / Device Role / Timing Role: High-reliability, AEC-Q200-compatible difference amplifier providing accurate analog signal translation in harsh environments. Use Value: Specified for −40°C to +85°C operation; 5V/µs slew rate handles fast transients from ignition noise without distortion. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar difference amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA105U | Higher gain error (±0.1%), lower bandwidth (1MHz), same SO-8 package and pinout. | Less suitable for high-speed current sensing but adequate for slower DC-coupled sensor interfaces. | Select when cost is primary constraint and 1MHz bandwidth suffices. |
| AD629ARZ | Higher common-mode range (±270V), higher quiescent current (1.2mA), SO-8 package with different pin assignment. | Targeted at high-voltage industrial monitoring; requires PCB redesign due to non-pin-compatible layout. | Select only when measuring >±100V common-mode signals - not drop-in replacement. |
Compared with INA105U and AD629ARZ, the INA133U/2K5 offers superior bandwidth and lower gain error in a pin-compatible SO-8 footprint, making it optimal for medium-speed precision differential acquisition where layout reuse and accuracy are prioritized over ultra-high common-mode voltage tolerance.
Availability
INA133U/2K5 is available at Aetrix Electronics and suitable for current sensing in motor drives, precision transducer signal conditioning, and battery-powered data acquisition requiring stable component supply and long-term production continuity.
Supply support for INA133U/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 (TI) is a global semiconductor leader specializing in analog and embedded processing technologies, with deep heritage in precision amplifiers dating to Burr-Brown's acquisition in 2000.
The INA133U/2K5 belongs to TI's precision difference amplifier product line, engineered for high-accuracy, low-cost signal acquisition in industrial, automotive, and portable instrumentation where laser-trimmed resistor networks eliminate external component matching.
FAQ
What is the maximum common-mode input voltage range for INA133U/2K5?
The INA133U/2K5 supports a common-mode input voltage range from 2(V–)+3V to 2(V+)-3V - for example, ±18V supplies enable input common-mode operation from −33V to +33V. This rail-enhanced range allows direct measurement of signals exceeding supply rails, critical for shunt-based current sensing and transducer interfaces where input offsets exceed V+ or fall below V–.
Does INA133U/2K5 require external resistors for gain setting?
No, the INA133U/2K5 does not require external resistors for gain setting. It integrates a laser-trimmed 25kΩ resistor network configured for precise unity gain (G = 1), with ±0.05% max gain error. The internal topology eliminates resistor matching concerns and ensures stable CMRR over temperature - all gain-related functions are fully self-contained within the INA133U/2K5 die.
Can INA133U/2K5 operate from a single supply?
Yes, the INA133U/2K5 operates from a single supply ranging from +4.5V to +36V. When used in single-supply mode, the reference pin (Pin 1) must be biased to a stable midpoint voltage (e.g., V+/2) to establish proper output swing. The device maintains its specified performance including 1.5MHz bandwidth and 5V/µs slew rate across this full single-supply range.
What is the purpose of the Sense pin (Pin 8) on INA133U/2K5?
The Sense pin (Pin 8) on INA133U/2K5 is an internal tap to the on-die 25kΩ resistor network and is not intended for external connection. It is left unconnected in normal operation and must remain floating - tying it to ground, supply, or any other node will disrupt internal resistor ratios and degrade gain accuracy and CMRR. Its presence reflects the monolithic construction but carries no user-accessible function.
Is INA133U/2K5 RoHS compliant and lead-free?
Yes, the INA133U/2K5 is RoHS compliant and lead-free, classified as "Green (RoHS & no Sb/Br)" per TI's packaging documentation. It features CU NIPDAU terminal finish and meets JEDEC MSL Level-3 moisture sensitivity requirements (260°C peak reflow, 168-hour floor life), supporting standard lead-free PCB assembly processes without special handling.
INA133U/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:
- 1.5 MHz
- Current - Input Bias:
- -
- Voltage - Input Offset:
- 150 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
INA133U/2K5 FAQ
1.How can I place an order for INA133U/2K5 through Aetrix?
Please submit a Request for Quotation (RFQ) for INA133U/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 INA133U/2K5 reliable?
The price and inventory of INA133U/2K5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA133U/2K5 is usually 5 days.
3.What payment methods are accepted for INA133U/2K5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA133U/2K5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA133U/2K5?
INA133U/2K5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA133U/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 INA133U/2K5?
For technical support, including INA133U/2K5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA133U/2K5 requirements.
6.How does Aetrix verify that INA133U/2K5 is sourced from the original manufacturer or authorized distributors?
All INA133U/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 INA133U/2K5 meets industry standards.
7.What is the process for return or replacement of INA133U/2K5?
All INA133U/2K5 units undergo pre-shipment inspection (PSI). If there is an issue with INA133U/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 INA133U/2K5 part is unused and in its original packaging.
Return procedure for INA133U/2K5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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