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Texas Instruments INA132U/2K5G4
- Part No.:
- INA132U/2K5G4
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
INA132U/2K5G4.pdf
- Description:
- IC OPAMP DIFF 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,606
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Product details
Overview
INA132U/2K5G4 from Texas Instruments is a low-power, unity-gain precision difference amplifier optimized for single-supply operation (2.7V to 36V), delivering ±0.075% max gain error, 90dB typical CMRR, and 175µA quiescent current. It integrates laser-trimmed resistors and an internal op amp with rail-to-rail common-mode input range extending to the negative supply - enabling accurate differential signal conditioning in optical modules, PLC controllers, and lab instrumentation.
For engineers reviewing the INA132U/2K5G4 datasheet, INA132U/2K5G4 pinout, INA132U/2K5G4 application, or INA132U/2K5G4 equivalent, key selection criteria include guaranteed CMRR over temperature, output swing capability at low supply voltages, laser-trimmed resistor matching, and SOIC-8 compatibility with industrial temperature range (–40°C to +85°C).
Technical Context
The INA132U/2K5G4 implements a monolithic difference amplifier architecture with on-chip, laser-trimmed 40kΩ resistor network ensuring precise 1× gain and high common-mode rejection. Its internal op amp features extended common-mode input range down to V–, supporting true single-supply operation without level-shifting circuitry.
It operates across dual supplies (±1.35V to ±18V) or single supply (2.7V to 36V), with stable performance up to 10,000pF capacitive load and 300kHz small-signal bandwidth. Gain accuracy is maintained via matched TCR of integrated resistors, minimizing drift-induced CMRR degradation over –40°C to +85°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | Single supply: 2.7V to 36V - enables direct interface with 3.3V, 5V, 12V, and 24V industrial rails without external regulators. |
| Gain Error (max) | ±0.075% - ensures <1mV error in 1.33V full-scale differential measurement, critical for precision analog input modules. |
| CMRR (typ) | 90dB - rejects >31,600:1 common-mode interference, essential for noisy environments like building security gateways. |
| Quiescent Current | 175µA - supports battery-powered or energy-constrained applications such as portable field instrumentation. |
| Input Offset Voltage (max) | ±250µV (±15V supply) - maintains sub-millivolt DC accuracy without external trimming in mass spectrometer front-ends. |
| Small-Signal Bandwidth | 300kHz - sufficient for DC-coupled sensor signals and slow control loops in CPU/PLC analog I/O stages. |
| Output Swing (RL=10kΩ) | (V+) – 1.5V / (V–) + 0.25V - delivers usable dynamic range near supply rails in single-supply configurations. |
Pinout & Package
INA132U/2K5G4 is housed in an SOIC-8 (D package), 4.9mm × 6mm surface-mount outline, rated for industrial temperature range (–40°C to +85°C) and RoHS-compliant (per INA132U/2K5.B variant documentation).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Ref) | Reference Input | Low-impedance reference node; output is referenced to this pin - interchanging with Pin 3 degrades CMRR. |
| 2 (–In) | Negative Input | Inverting input terminal; source impedance must match Pin 3 to preserve specified CMRR. |
| 3 (+In) | Positive Input | Noninverting input terminal; mismatched source impedances reduce effective CMRR by >10dB. |
| 4 (V–) | Negative Supply | Ground or negative rail connection; op amp common-mode range extends to this pin. |
| 5 (Sense) | Sense Input | Low-impedance sense point; interchanging with Pin 2 degrades CMRR - not interchangeable despite nominal resistor equality. |
| 6 (Output) | Amplifier Output | Unity-gain buffered differential output; drives loads up to 10,000pF without instability. |
| 7 (V+) | Positive Supply | Primary power rail; supports up to 36V single supply or ±18V dual supply operation. |
| 8 (NC) | No Internal Connection | Unbonded die pad - must remain unconnected to avoid parasitic coupling or latch-up risk. |
Key Features
| Feature | Design Value |
|---|---|
| Laser-trimmed resistor network | Ensures 1× gain accuracy and 90dB CMRR without external precision resistors - reduces BOM count and layout sensitivity. |
| Extended common-mode input range | Operates with inputs down to V–, eliminating need for input biasing in single-supply systems like AC analog input modules. |
| Low quiescent current (175µA) | Enables always-on monitoring in battery-backed instrumentation without compromising runtime or thermal budget. |
| Stable with 10,000pF load | Eliminates need for output isolation resistors when driving long traces, ADC input capacitors, or multiplexer channels. |
| Industrial temperature range | Guaranteed performance from –40°C to +85°C - suitable for deployment in uncontrolled environments like factory-floor PLCs. |
Applications
| Optical Module Signal Conditioning | PLC Analog Input Stage |
|---|---|
|
Use Scenario: Amplifying low-level differential photocurrent signals from PIN photodiodes in fiber-optic transceivers while rejecting common-mode noise from switching power supplies. IC Role / Device Role / Timing Role: Precision difference amplifier providing unity-gain, high-CMRR signal extraction before ADC digitization. Use Value: 90dB CMRR suppresses >30dB of EMI from adjacent DC-DC converters, preserving SNR in 12-bit+ data acquisition. |
Use Scenario: Isolating and scaling ±10V industrial sensor outputs (e.g., 4–20mA loop receivers) into microcontroller-compatible 0–3.3V ranges. IC Role / Device Role / Timing Role: Single-supply difference amplifier converting bipolar field signals to unipolar logic-level inputs. Use Value: Rail-to-rail common-mode input allows direct interface with grounded sensors without external level shifters or bias networks. |
| Lab Instrumentation Front-End | Mass Spectrometer Detector Interface |
|
Use Scenario: Conditioning microvolt-level differential outputs from strain gauge bridges or thermopile sensors in portable analyzers. IC Role / Device Role / Timing Role: Low-drift, low-noise difference amplifier serving as first-stage signal conditioner before programmable gain amplification. Use Value: ±250µV max offset and ±5µV/°C drift ensure <10µV total error over 0–50°C ambient, meeting Class A calibration requirements. |
Use Scenario: Amplifying picoampere-range ion current signals from quadrupole mass filters where leakage and noise dominate measurement fidelity. IC Role / Device Role / Timing Role: High-input-impedance (80kΩ) differential amplifier rejecting ground-loop interference in vacuum chamber electronics. Use Value: Laser-trimmed resistor matching maintains CMRR >76dB even with 8Ω source impedance mismatch - critical for femtoampere resolution. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar difference amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA133UA/2K5 | Higher quiescent current (250µA), wider bandwidth (1MHz), but lower CMRR (80dB typ) and no laser-trimmed resistors. | Better for AC-coupled, higher-speed applications where DC precision is secondary to slew rate. | Select when bandwidth >300kHz is required and CMRR >85dB is not mandatory. |
| AD629ARZ | Higher supply voltage (±15V only), higher gain error (±0.1%), but includes built-in 20:1 attenuator for high-voltage differential sensing. | Designed for ±270V common-mode rejection in motor drive current sensing - not drop-in for low-voltage precision use cases. | Choose only for high-CMVR (>200V) applications; unsuitable for single-supply or sub-5V operation. |
Compared with INA132U/2K5G4, INA133UA/2K5 trades DC precision for speed, while AD629ARZ sacrifices low-voltage flexibility for high-CMVR robustness - neither offers identical laser-trimmed 1× gain accuracy or 175µA quiescent current in SOIC-8.
Availability
INA132U/2K5G4 is available at Aetrix Electronics and suitable for optical module manufacturing, PLC controller design, and lab instrumentation development requiring stable component supply, long-term lifecycle support, and industrial-grade reliability.
Supply support for INA132U/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 is a global semiconductor leader specializing in analog and embedded processing technologies, with decades of expertise in precision amplifiers and signal-conditioning ICs.
The INA132 product line was designed specifically for low-power, high-accuracy differential signal acquisition in space- and energy-constrained industrial and instrumentation systems - emphasizing laser-trimmed resistor integration and single-supply usability.
FAQ
What is the maximum common-mode input voltage range for INA132U/2K5G4?
The INA132U/2K5G4 supports a common-mode input voltage range from V– to 2(V+) – 2V. At ±15V supply, this extends from –15V to +28V; at +5V single supply, it spans 0V to +8V. This wide range enables direct interfacing with grounded sensors and high-side measurements without external level shifting - a key advantage of the internal op amp's single-supply architecture.
Does INA132U/2K5G4 require external precision resistors to achieve unity gain?
No. The INA132U/2K5G4 integrates a laser-trimmed 40kΩ resistor network that guarantees ±0.075% gain error and 90dB CMRR without external components. This eliminates resistor matching tolerances, thermal tracking errors, and PCB layout sensitivity - making INA132U/2K5G4 a complete, self-contained difference amplifier solution.
Can INA132U/2K5G4 operate from a 3.3V single supply?
Yes. INA132U/2K5G4 is fully specified down to 2.7V single supply. At 3.3V, it delivers usable output swing (V– + 0.25V to V+ – 1.5V), 90dB CMRR, and 175µA quiescent current - making it ideal for modern low-voltage industrial IoT nodes and portable test equipment where power efficiency and rail compatibility are critical.
What is the purpose of the Sense pin (Pin 5) on INA132U/2K5G4?
Pin 5 (Sense) is a dedicated low-impedance node for remote sensing of differential input signals - it must be driven with a low-impedance source. Interchanging Pin 5 with Pin 2 degrades CMRR because the internal laser-trimmed resistor ratios are optimized for specific terminal assignments. This pin enables accurate differential measurement without relying on PCB trace matching.
Is INA132U/2K5G4 pin-compatible with other Texas Instruments difference amplifiers?
INA132U/2K5G4 uses the standard SOIC-8 footprint shared by INA133, INA143, and INA146, but pin functions differ significantly. For example, INA133 lacks a dedicated Sense pin and uses different reference topology. Direct replacement requires schematic and layout revision - INA132U/2K5G4's Pin 1 (Ref), Pin 5 (Sense), and Pin 8 (NC) assignment is unique to its precision resistor architecture.
INA132U/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:
- 0.1V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 300 kHz
- Current - Input Bias:
- -
- Voltage - Input Offset:
- 75 µV
- Current - Supply:
- 160µA
- Current - Output / Channel:
- 12 mA
- Voltage - Supply Span (Min):
- 2.7 V
- Voltage - Supply Span (Max):
- 36 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
INA132U/2K5G4 FAQ
1.How can I place an order for INA132U/2K5G4 through Aetrix?
Please submit a Request for Quotation (RFQ) for INA132U/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 INA132U/2K5G4 reliable?
The price and inventory of INA132U/2K5G4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA132U/2K5G4 is usually 5 days.
3.What payment methods are accepted for INA132U/2K5G4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA132U/2K5G4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA132U/2K5G4?
INA132U/2K5G4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA132U/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 INA132U/2K5G4?
For technical support, including INA132U/2K5G4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA132U/2K5G4 requirements.
6.How does Aetrix verify that INA132U/2K5G4 is sourced from the original manufacturer or authorized distributors?
All INA132U/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 INA132U/2K5G4 meets industry standards.
7.What is the process for return or replacement of INA132U/2K5G4?
All INA132U/2K5G4 units undergo pre-shipment inspection (PSI). If there is an issue with INA132U/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 INA132U/2K5G4 part is unused and in its original packaging.
Return procedure for INA132U/2K5G4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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