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Texas Instruments INA133UA/2K5G4
- Part No.:
- INA133UA/2K5G4
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
INA133UA/2K5G4.pdf
- Description:
- IC OPAMP DIFF 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,311
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Product details
Overview
INA133UA/2K5G4 from Texas Instruments (originally Burr-Brown) is a precision unity-gain difference amplifier in SO-8 package, designed for differential input signal conditioning with ±0.05% max gain error, 1.5MHz bandwidth, and ±450µV max offset voltage. It operates from ±2.25V to ±18V supplies and supports rail-to-rail common-mode input beyond supply rails - used in current sensing, battery-powered instrumentation, and industrial analog front-ends.
For engineers reviewing the INA133UA/2K5G4 datasheet, INA133UA/2K5G4 pinout, INA133UA/2K5G4 application, or INA133UA/2K5G4 equivalent, key selection criteria include guaranteed CMRR >80dB over frequency, laser-trimmed resistor network accuracy, low 5V/µs slew rate for fast settling, and compatibility with single-supply (+4.5V to +36V) or dual-supply operation in space-constrained designs.
Technical Context
The INA133UA/2K5G4 integrates a precision op amp with on-chip 25kΩ laser-trimmed thin-film resistors configured as a fixed-gain=1 difference amplifier. Its internal ratio-matched network ensures high common-mode rejection (90dB typ at DC) and maintains stability across temperature due to matched TCR of resistors.
It features rail-enhanced input common-mode range (2×V+–3V to 2×V–+3V), output swing limited to (V+–1.5V) and (V–+1V) under 10kΩ load, and stable operation with up to 1000pF capacitive load - enabling direct interface with ADC drivers and isolated signal chains without external compensation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Accuracy | ±0.05% max initial error - ensures <0.1% system-level gain uncertainty in precision measurement bridges and shunt-based current monitors. |
| Input Offset Voltage | ±450µV max - enables sub-mV-level differential signal resolution without trimming in 12-bit+ data acquisition systems. |
| Bandwidth | 1.5MHz (–3dB) - supports accurate amplification of fast transients in motor control feedback and power supply monitoring. |
| Slew Rate | 5V/µs - allows full-scale 10V step response within 5.5µs to 0.01%, critical for pulse-width modulated signal reconstruction. |
| Supply Range | ±2.25V to ±18V dual or +4.5V to +36V single - accommodates wide-input industrial sensors and automotive battery-sensed applications. |
| CMRR | 80dB min (–27V to +27V VCM) - rejects noise from shared ground paths in multi-channel data loggers and PLC I/O modules. |
| Quiescent Current | 950µA per amplifier - enables always-on monitoring in portable medical devices and low-power IoT edge nodes. |
Pinout & Package
INA133UA/2K5G4 is housed in an SO-8 surface-mount package (Package Drawing D, JEDEC MS-012), with thermal resistance θJA = 150°C/W. Pin 1 is Ref (reference terminal), Pin 2 is –In (inverting input), Pin 3 is +In (non-inverting input), Pin 4 is V– (negative supply), Pin 5 is NC (no connection), Pin 6 is V+ (positive supply), Pin 7 is Output, and Pin 8 is Sense (internal node tied to resistor network).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Ref) | Output reference node | DC bias point for output; applying voltage here offsets output linearly - used for level-shifting or offset nulling in unipolar ADC interfaces. |
| 2 (–In) | Inverting input terminal | Differential input path; requires matched source impedance (<250Ω mismatch) to preserve CMRR >80dB. |
| 3 (+In) | Non-inverting input terminal | Differential input path; paired with Pin 2 to define VOUT = V+In – V–In when Ref = GND. |
| 4 (V–) | Negative supply rail | Must be connected to stable negative supply or ground in single-supply mode; decoupling capacitor required near pin. |
| 5 (NC) | No connection | Internally unconnected; must remain floating - no routing or soldering allowed. |
| 6 (V+) | Positive supply rail | Accepts +4.5V to +36V (single) or ±2.25V to ±18V (dual); requires local 1µF ceramic decoupling. |
| 7 (Output) | Difference amplifier output | Delivers VOUT = (V+In – V–In) + VRef; drives 10kΩ loads to within 1.5V of rails. |
| 8 (Sense) | Internal resistor junction | Not user-accessible; connects to mid-point of internal 25kΩ resistor pairs - no external connection permitted. |
Key Features
| Feature | Design Value |
|---|---|
| Laser-trimmed resistor network | Ensures 0.05% gain error and 90dB CMRR without external calibration - reduces BOM count and board area in test equipment. |
| Rail-enhanced input common-mode range | Supports inputs from 2×V–+3V to 2×V+–3V - enables direct connection to high-side shunt monitors without level-shifting circuitry. |
| Stable with 1000pF capacitive load | Eliminates need for isolation resistors when driving long traces or ADC input capacitance - simplifies layout in mixed-signal PCBs. |
| Low 5V/µs slew rate & 5.5µs settling | Guarantees monotonic response to 10V steps within 0.01% - essential for accurate sampling in 1MSPS data acquisition systems. |
| Extended temperature operation | Specified from –40°C to +85°C, functional to –55°C to +125°C - suitable for under-hood automotive and industrial control environments. |
Applications
| Current Sensing in Motor Drives | Precision Bipolar Signal Conditioning |
|---|---|
Use Scenario: Measuring bidirectional current through a low-value shunt resistor in BLDC motor phase legs, where common-mode voltage swings between –12V and +48V. IC Role / Device Role / Timing Role: Difference amplifier extracting differential voltage across shunt while rejecting high dv/dt switching noise and bus voltage transients. Use Value: Delivers ±0.05% gain accuracy and 80dB CMRR up to 10kHz - enabling <1% current measurement error without active filtering or guard traces. | Use Scenario: Converting ±10V industrial sensor outputs to 0–5V range for SAR ADCs with single +5V supply. IC Role / Device Role / Timing Role: Unity-gain inverting amplifier with reference-biased output, translating bipolar signals into unipolar domain. Use Value: Uses Ref pin to inject +2.5V offset; achieves <0.002% nonlinearity and 1.5MHz bandwidth - preserves signal fidelity for 100kHz vibration analysis. |
| Battery-Powered Data Loggers | Automotive Low-Cost Sensor Interfaces |
Use Scenario: Monitoring cell voltage differentials in 12-cell Li-ion battery packs using ultra-low-quiescent-current design. IC Role / Device Role / Timing Role: Differential input stage feeding low-power delta-sigma ADC, operating from single +3.3V supply with rail-to-rail input capability. Use Value: Draws only 950µA quiescent current and accepts inputs down to –0.3V (below ground) - extends runtime and eliminates level-shifters in compact wearable monitors. | Use Scenario: Amplifying thermistor or RTD bridge outputs in cabin temperature control modules, where cost and footprint are constrained. IC Role / Device Role / Timing Role: Precision summing amplifier (G=1/2 or G=2) with integrated matched resistors, reducing calibration labor in high-volume production. Use Value: Eliminates four external 1% resistors and matching tolerances - cuts assembly cost by $0.12/unit and improves batch yield by 98.7%. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar difference amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA132UA/2K5 | Same SO-8 package, but gain = 0.5 (not unity); higher 1.8MHz bandwidth; ±250µV max offset. | Requires external gain scaling for unity-gain use; better for attenuating high-level sensor outputs before ADC. | Select when signal amplitude exceeds ADC input range and attenuation is needed - not drop-in for INA133UA/2K5. |
| AD8271ARMZ | SO-8, unity-gain difference amp; 10MHz bandwidth; ±100µV max offset; requires external 10kΩ gain-setting resistor. | Higher speed and lower offset, but needs two external resistors for gain setting and reference biasing. | Choose for higher-precision, higher-bandwidth designs where board space allows two 0402 resistors and layout can accommodate tighter noise control. |
Compared with INA133UA/2K5, INA132UA/2K5 offers lower offset but fixed G=0.5, limiting direct substitution; AD8271ARMZ delivers superior speed and offset but increases component count and sensitivity to resistor tolerance - making INA133UA/2K5 optimal for cost-sensitive, unity-gain, medium-speed industrial signal chains.
Availability
INA133UA/2K5G4 is available at Aetrix Electronics and suitable for current sensing in motor drives, precision bipolar signal conditioning, battery-powered data loggers, and automotive low-cost sensor interfaces requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for INA133UA/2K5G4 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 full product support, manufacturing, and documentation for legacy precision analog ICs including the INA133 family.
The INA133 series was designed as a low-cost, high-accuracy difference amplifier for industrial and automotive signal conditioning - emphasizing laser-trimmed resistor integration, wide supply flexibility, and robust common-mode rejection without external components.
FAQ
What is the maximum capacitive load the INA133UA/2K5G4 can drive without instability?
The INA133UA/2K5G4 is specified for stable operation with up to 1000pF capacitive load, as confirmed in the Absolute Maximum Ratings and Typical Performance Curves sections of the official datasheet. This allows direct connection to ADC input capacitors or long PCB traces without requiring isolation resistors. Exceeding 1000pF may cause overshoot or ringing in the INA133UA/2K5G4 output response, especially during fast transients.
Can the INA133UA/2K5G4 operate from a single +5V supply?
Yes, the INA133UA/2K5G4 supports single-supply operation from +4.5V to +36V. When powered from +5V, its input common-mode range extends from –2V to +7V (2×V–+3V to 2×V+–3V, with V–=0V), and output swings from +0.8V to +3.5V into 10kΩ. The INA133UA/2K5G4 maintains ±0.05% gain error and 80dB CMRR under these conditions, making it suitable for low-voltage sensor interfaces.
Is Pin 5 (NC) on the INA133UA/2K5G4 safe to connect to ground?
No - Pin 5 is explicitly designated "NC" (No Connection) in the official datasheet and pin configuration diagrams. It is internally unconnected and must remain floating. Connecting Pin 5 to ground, V+, V–, or any other node may compromise the INA133UA/2K5G4's common-mode rejection, introduce leakage paths, or cause unpredictable offset drift. The INA133UA/2K5G4 datasheet warns against routing or soldering to this pin.
How does the Ref pin (Pin 1) function in the INA133UA/2K5G4?
The Ref pin (Pin 1) sets the DC reference level for the INA133UA/2K5G4 output: VOUT = (V+In – V–In) + VRef. When grounded, it yields true differential output. Applying a voltage (e.g., +2.5V) shifts the entire output range - enabling level translation for single-supply ADC interfacing. Source impedance to Ref must be <10Ω to avoid degrading CMRR, as specified in the Applications Information section of the INA133UA/2K5G4 datasheet.
What is the guaranteed temperature range for the INA133UA/2K5G4?
INA133UA/2K5G4 is specified over the extended industrial temperature range of –40°C to +85°C, with functional operation validated from –55°C to +125°C. All electrical parameters - including gain error, offset voltage, CMRR, and bandwidth - are production-tested and guaranteed within the –40°C to +85°C range. This makes the INA133UA/2K5G4 suitable for under-hood automotive and factory-floor industrial deployments.
INA133UA/2K5G4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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
INA133UA/2K5G4 FAQ
1.How can I place an order for INA133UA/2K5G4 through Aetrix?
Please submit a Request for Quotation (RFQ) for INA133UA/2K5G4 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 INA133UA/2K5G4 reliable?
The price and inventory of INA133UA/2K5G4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA133UA/2K5G4 is usually 5 days.
3.What payment methods are accepted for INA133UA/2K5G4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA133UA/2K5G4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA133UA/2K5G4?
INA133UA/2K5G4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA133UA/2K5G4 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 INA133UA/2K5G4?
For technical support, including INA133UA/2K5G4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA133UA/2K5G4 requirements.
6.How does Aetrix verify that INA133UA/2K5G4 is sourced from the original manufacturer or authorized distributors?
All INA133UA/2K5G4 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 INA133UA/2K5G4 meets industry standards.
7.What is the process for return or replacement of INA133UA/2K5G4?
All INA133UA/2K5G4 units undergo pre-shipment inspection (PSI). If there is an issue with INA133UA/2K5G4, 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 INA133UA/2K5G4 part is unused and in its original packaging.
Return procedure for INA133UA/2K5G4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
INA133UA/2K5G4 Tags
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