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Texas Instruments OPA132UG4
- Part No.:
- OPA132UG4
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA132UG4.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,941
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Product details
Overview
OPA132UG4 from Texas Instruments is a single-channel, high-speed, FET-input operational amplifier designed for precision analog signal conditioning in high-impedance sensor interfaces and audio/data acquisition systems. It delivers 8 MHz gain-bandwidth, 20 V/µs slew rate, 8 nV/√Hz input voltage noise at 1 kHz, ±2.5 V to ±18 V supply operation, and 50 pA maximum input bias current.
For engineers reviewing the OPA132UG4 datasheet, OPA132UG4 pinout, OPA132UG4 application, or OPA132UG4 equivalent, key selection criteria include its unity-gain stability, low-noise JFET input stage, offset trim capability, wide common-mode range (±13 V), and robust capacitive load drive-critical for SAR ADC drivers, photodiode trans-impedance amplifiers, and active filter designs.
Technical Context
The OPA132UG4 employs a cascoded JFET input stage that maintains ultra-low input bias current (<50 pA) across its full ±13 V common-mode range while suppressing phase inversion-a known failure mode in legacy FET op amps. Its fully differential, high-slew-rate output stage enables fast settling (0.7 µs to 0.1%, 10 V step) into 100 pF loads without external compensation.
Internally compensated for unity-gain stability, the device achieves 130 dB open-loop gain into 600 Ω, 96 dB CMRR, and ±4 mA quiescent current per amplifier. Input offset voltage is laser-trimmed to ≤500 µV (max), with dedicated pins (1 and 8) enabling external nulling for sub-100 µV system-level accuracy.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-Bandwidth Product | 8 MHz - supports stable closed-loop gain ≥1 with bandwidth up to 8 MHz |
| Slew Rate | 20 V/µs - enables <1 µs settling for 10 V output steps, critical for fast data acquisition |
| Input Voltage Noise | 8 nV/√Hz @ 1 kHz - preserves SNR in low-level sensor amplification (e.g., piezoelectric, photodiode) |
| Input Bias Current | 50 pA max @ 25°C - minimizes voltage error in >100 MΩ source impedance circuits |
| Common-Mode Range | ±13 V @ ±15 V supply - allows rail-to-rail input operation in ±15 V systems |
| Open-Loop Gain | 130 dB @ 600 Ω load - ensures <0.0005% gain error in precision buffer configurations |
| Supply Voltage Range | ±2.5 V to ±18 V - supports industrial, audio, and high-voltage data acquisition rails |
Pinout & Package
OPA132UG4 is packaged in an 8-pin SOIC (D package), 4.90 mm × 3.91 mm body size, with surface-mount compatibility and standard JEDEC outline.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Offset Trim) | Input offset voltage adjust | Connects to potentiometer wiper for manual nulling of input offset; typical trim range ±4 mV |
| 2 (–In) | Inverting input | Differential input node; high-impedance JFET gate with 10¹³ Ω || 2 pF input impedance |
| 3 (+In) | Noninverting input | Differential input node; identical impedance and noise performance as –In |
| 4 (V–) | Negative power supply | Reference for internal biasing; must be connected to negative rail (e.g., –15 V) |
| 5 (NC) | No internal connection | Unbonded pad; electrically isolated and may be left floating or grounded for thermal stability |
| 6 (Output) | Amplifier output | Capable of ±2.5 V swing into 600 Ω; stable driving ≥100 pF without oscillation |
| 7 (V+) | Positive power supply | Reference for internal biasing; must be connected to positive rail (e.g., +15 V) |
| 8 (Offset Trim) | Input offset voltage adjust | Completes external trim circuit; used with Pin 1 to balance input stage mismatch |
Key Features
| Feature | Design Value |
|---|---|
| FET input stage with cascode topology | Maintains ≤50 pA input bias current across full ±13 V common-mode range, eliminating phase reversal |
| Unity-gain stable internal compensation | Enables direct use in voltage followers, integrators, and active filters without external components |
| Dedicated offset trim pins (1 & 8) | Supports external nulling to <100 µV system offset-essential for precision instrumentation front-ends |
| Low distortion (0.00008% THD+N) | Preserves signal fidelity in audio line drivers and high-resolution DAC output buffers |
| High capacitive load drive capability | Stable operation with ≥100 pF load capacitance-reduces need for isolation resistors in PCB layout |
Applications
| Photodiode Amplifier | SAR ADC Driver |
|---|---|
Use Scenario: Amplifying low-current signals from reverse-biased photodiodes in optical sensing, spectrometry, or medical pulse oximetry. IC Role / Device Role / Timing Role: Trans-impedance amplifier converting photocurrent to voltage with minimal added noise and bias-induced error. Use Value: 8 nV/√Hz voltage noise and 50 pA input bias current maximize dynamic range and SNR for sub-nA photocurrents. | Use Scenario: Driving the switched-capacitor input of 16-bit+ successive-approximation register (SAR) ADCs in data loggers and test equipment. IC Role / Device Role / Timing Role: Precision buffer delivering fast settling (<1 µs), low distortion, and low output impedance to charge ADC sampling capacitor. Use Value: 20 V/µs slew rate and 8 MHz bandwidth ensure full-scale step settling within ADC acquisition window, minimizing missing codes. |
| Voltage Reference Buffer | Active Filters |
Use Scenario: Isolating and buffering precision voltage references (e.g., REF5025) in high-accuracy DAC/ADC reference paths. IC Role / Device Role / Timing Role: Unity-gain voltage follower maintaining reference stability against load variations and PCB trace impedance. Use Value: 130 dB open-loop gain and ±13 V common-mode range prevent reference droop and maintain ppm-level accuracy under varying loads. | Use Scenario: Implementing 2nd-order low-pass, high-pass, or band-pass filters in audio processing, anti-aliasing, and sensor signal conditioning. IC Role / Device Role / Timing Role: Active gain stage in Sallen-Key or multiple-feedback topologies requiring low noise, low distortion, and stable frequency response. Use Value: 0.00008% THD+N and flat 8 MHz bandwidth enable clean filter responses up to 30 kHz without harmonic contamination. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed FET-input operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA132UA | Same silicon, SOIC-8 package but rated for 0°C to 70°C industrial temp range vs. –40°C to 85°C for OPA132UG4 | Not suitable for extended temperature environments such as outdoor industrial sensors or automotive under-hood modules | Select OPA132UG4 when operation over –40°C to 85°C is required; OPA132UA suffices for commercial-grade board-level applications |
| AD823ANZ | Single 16 MHz GBW rail-to-rail output op amp; higher supply current (7.5 mA), no offset trim pins, 12 nV/√Hz noise | Better for rail-to-rail output swing needs but lacks OPA132UG4's ultra-low input bias current and precision trim capability | Choose AD823ANZ where output swing to rails is mandatory and input impedance >1 GΩ is not critical |
Compared with OPA132UA and AD823ANZ, the OPA132UG4 uniquely combines extended temperature rating, dedicated offset trim, and sub-50 pA input bias current-making it the only option among the three qualified for high-precision, high-impedance, wide-temperature sensor signal chains.
Availability
OPA132UG4 is available at Aetrix Electronics and suitable for precision instrumentation, industrial data acquisition, and high-fidelity audio signal conditioning requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for OPA132UG4 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 leadership in precision op amp design and manufacturing.
The OPAx132 product line was engineered specifically for high-source-impedance, low-noise, wide-bandwidth applications-including photodiode amplification, reference buffering, and SAR ADC driving-where traditional bipolar op amps introduce unacceptable bias current errors.
FAQ
What is the operating temperature range for the OPA132UG4?
The OPA132UG4 is specified for continuous operation from –40°C to +85°C ambient temperature. This extended industrial temperature range is validated per TI's SBOS054B datasheet and applies to both PDIP and SOIC packages. The device maintains all key specifications-including input bias current, offset voltage, and gain-bandwidth-within this range, making it suitable for harsh-environment applications like factory automation and outdoor instrumentation where thermal cycling occurs.
Does the OPA132UG4 require external compensation for unity-gain stability?
No, the OPA132UG4 is internally compensated and unity-gain stable by design. Its compensation network ensures unconditional stability in voltage-follower, inverting, and non-inverting configurations with gains ≥1, even when driving capacitive loads up to 100 pF. This eliminates the need for external compensation components, simplifying layout and reducing bill-of-materials cost-confirmed in Section 7.3 and Figure 17 of the SBOS054B datasheet.
Can the OPA132UG4 drive a 600 Ω load effectively?
Yes, the OPA132UG4 delivers full-rated performance into 600 Ω loads, including 130 dB open-loop gain and ±2.5 V output swing (at ±15 V supplies). Its output stage is optimized for low-distortion operation into heavy loads, supporting 0.00008% THD+N at 1 kHz with 3.5 Vrms output. This makes the OPA132UG4 suitable for driving legacy test equipment inputs, transformer-coupled audio stages, and low-impedance filter networks without signal degradation.
How does the OPA132UG4 prevent phase inversion at the input?
The OPA132UG4 uses an input cascode circuitry architecture that maintains constant input bias current and avoids the phase-reversal behavior common in basic JFET op amps. Unlike conventional FET-input devices, it sustains stable operation even when the input common-mode voltage exceeds the supply rails by up to 0.7 V-verified in functional testing and documented in Section 8.1 of SBOS054B. This eliminates catastrophic output polarity flips in voltage-follower configurations used in control loops.
What is the purpose of Pins 1 and 8 on the OPA132UG4?
Pins 1 and 8 on the OPA132UG4 are dedicated offset voltage trim terminals. They allow external adjustment of input offset voltage using a 10 kΩ potentiometer connected between them, with the wiper tied to V–. This feature enables fine nulling down to <100 µV-critical for precision DC-coupled applications like strain gauge amplifiers or thermocouple signal conditioning-without degrading long-term drift, as detailed in Section 8.1.2 of the SBOS054B datasheet.
OPA132UG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 20V/µs
- Gain Bandwidth Product:
- 8 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 5 pA
- Voltage - Input Offset:
- 250 µV
- Current - Supply:
- 4mA
- Current - Output / Channel:
- -
- Voltage - Supply Span (Min):
- 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
OPA132UG4 FAQ
1.How can I place an order for OPA132UG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA132UG4 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 OPA132UG4 reliable?
The price and inventory of OPA132UG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA132UG4 is usually 5 days.
3.What payment methods are accepted for OPA132UG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA132UG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA132UG4?
OPA132UG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA132UG4 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 OPA132UG4?
For technical support, including OPA132UG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA132UG4 requirements.
6.How does Aetrix verify that OPA132UG4 is sourced from the original manufacturer or authorized distributors?
All OPA132UG4 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 OPA132UG4 meets industry standards.
7.What is the process for return or replacement of OPA132UG4?
All OPA132UG4 units undergo pre-shipment inspection (PSI). If there is an issue with OPA132UG4, 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 OPA132UG4 part is unused and in its original packaging.
Return procedure for OPA132UG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
OPA132UG4 Tags
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