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Texas Instruments OPA132UA/2K5G4
- Part No.:
- OPA132UA/2K5G4
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA132UA/2K5G4.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,228
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Product details
Overview
OPA132UA/2K5G4 from Texas Instruments is a single-channel, high-speed JFET-input operational amplifier designed for precision analog signal conditioning in high-impedance sensor interfaces and data acquisition systems. It delivers 8 MHz gain-bandwidth, ±20 V/µs slew rate, 8 nV/√Hz input voltage noise at 1 kHz, ±50 pA max input bias current, and operates from ±2.5 V to ±18 V supplies.
For engineers reviewing the OPA132UA/2K5G4 datasheet, OPA132UA/2K5G4 pinout, OPA132UA/2K5G4 application, or OPA132UA/2K5G4 equivalent, key selection criteria include its unity-gain stability, low-noise FET input architecture, offset trim capability, and SOIC-8 packaging suitable for space-constrained industrial and audio signal chains.
Technical Context
The OPA132UA/2K5G4 employs a cascoded JFET input stage that maintains ultra-low input bias current (≤50 pA) across its full common-mode range (±13 V), eliminating phase inversion issues common in legacy FET op amps. Its fully differential output stage drives capacitive loads up to 100 pF while maintaining 0.1% settling in 1 µs at G = –1.
Internally compensated for unity-gain stability, it achieves 130 dB open-loop gain into 600 Ω, 96 dB CMRR, and 100 dB PSRR - enabling high-accuracy DC-coupled amplification in SAR ADC drivers and photodiode transimpedance configurations without external compensation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-Bandwidth Product | 8 MHz - supports stable closed-loop operation up to 10× gain with <1° phase margin at unity gain. |
| Slew Rate | ±20 V/µs - enables accurate reproduction of fast 10-V step signals with ≤0.7 µs 0.1% settling time. |
| Input Voltage Noise | 8 nV/√Hz at 1 kHz - minimizes contribution to total system noise in 10–100 kHz bandwidth applications. |
| Input Bias Current | ±50 pA max at 25°C - preserves signal integrity in >100 MΩ source impedance circuits like piezoelectric sensors. |
| Supply Voltage Range | ±2.5 V to ±18 V - allows direct interfacing with ±5 V, ±12 V, and ±15 V industrial power rails without level-shifting. |
| Input Offset Voltage | ±500 µV max - ensures ≤0.5 mV DC error in unity-gain buffer applications over temperature. |
| Open-Loop Gain | 130 dB into 600 Ω - provides ≥1000 V/V loop gain for precise closed-loop gain accuracy and linearity. |
| THD + Noise | 0.00008% at 1 kHz - meets high-fidelity audio and metrology requirements with minimal harmonic distortion. |
Pinout & Package
OPA132UA/2K5G4 is housed in an 8-pin SOIC (SO-8) package measuring 4.90 mm × 3.91 mm, optimized for surface-mount assembly and thermal performance in compact PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Offset Trim) | Input offset voltage adjustment node | Connects to external 10-kΩ potentiometer wiper for manual nulling; typical trim range ±4 mV. |
| 2 (–In) | Inverting input | Differential input terminal; high-impedance JFET node with ≤50 pA bias current. |
| 3 (+In) | Noninverting input | Differential input terminal; matched to Pin 2 for optimal CMRR and input stage symmetry. |
| 4 (V–) | Negative supply rail | Connects to negative power supply; supports operation down to –2.5 V. |
| 5 (NC) | No internal connection | Unbonded die pad; must be left floating or tied to ground for mechanical stability only. |
| 6 (Output) | Amplifier output | Capable of ±1.5 V swing into 2 kΩ at ±15 V supplies; stable with ≥100 pF capacitive load. |
| 7 (V+) | Positive supply rail | Connects to positive power supply; supports operation up to +18 V. |
| 8 (Offset Trim) | Input offset voltage adjustment node | Second terminal of offset trim network; completes potentiometer connection for laser-trimmed nulling. |
Key Features
| Feature | Design Value |
|---|---|
| FET input architecture | Enables ≤50 pA input bias current and >10¹³ Ω input impedance for high-Z sensor interfacing. |
| Unity-gain stable design | Eliminates need for external compensation components in voltage-follower and gain-of-one configurations. |
| Phase-inversion immunity | Cascoded input stage prevents output polarity reversal when common-mode voltage exceeds rails. |
| Offset voltage trim pins | Pins 1 and 8 allow fine-tuning of input offset to <50 µV in critical DC-coupled measurement paths. |
| Wide supply range support | Operates from ±2.5 V to ±18 V, enabling use in both low-power portable and high-voltage industrial systems. |
| Low distortion performance | 0.00008% THD+N at 1 kHz ensures fidelity in audio preamplifiers and precision waveform generation. |
Applications
| SAR ADC Driver | Voltage Reference Buffer |
|---|---|
Use Scenario: Driving the switched-capacitor input of a 16-bit successive-approximation ADC with 100 kSPS sampling rate. IC Role / Device Role / Timing Role: Precision unity-gain buffer isolating reference voltage from dynamic ADC input current spikes. Use Value: 8 nV/√Hz noise and ±50 pA bias current prevent code-dependent errors and maintain effective resolution >15.5 bits. | Use Scenario: Stabilizing and distributing a precision 2.5 V bandgap reference to multiple analog subsystems. IC Role / Device Role / Timing Role: Low-drift, low-noise voltage follower with high PSRR to reject supply ripple and maintain reference accuracy. Use Value: 100 dB PSRR at 100 Hz and 130 dB open-loop gain ensure <1 µV output variation under ±100 mV supply fluctuation. |
| Trans-impedance Amplifier | Active Filters |
Use Scenario: Converting photocurrent from a 10 nA–10 µA silicon photodiode into a measurable voltage signal. IC Role / Device Role / Timing Role: High-gain, low-input-bias-current transimpedance amplifier with feedback resistor up to 100 MΩ. Use Value: ≤50 pA input bias current avoids dark-current-induced offset; 8 MHz bandwidth supports >100 kHz optical modulation detection. | Use Scenario: Implementing a 2nd-order 30 kHz low-pass filter in audio anti-aliasing or sensor signal conditioning. IC Role / Device Role / Timing Role: Active filter core providing precise frequency response shaping with minimal passband ripple. Use Value: 0.00008% THD+N and 8 MHz GBW enable flat group delay and <0.1 dB passband ripple up to 25 kHz. |
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 |
|---|---|---|---|
| OPA132U | Same SOIC-8 package and electrical specs; lacks tape-and-reel packaging (OPA132UA/2K5G4 is 2.5k/reel). | Identical functional behavior; differs only in packaging format and reel quantity. | Select OPA132U for prototype quantities or non-automated assembly; OPA132UA/2K5G4 for SMT production runs. |
| AD825ARZ | Higher 45 MHz GBW but higher 12 nV/√Hz noise; bipolar input (200 nA IB) vs JFET (50 pA IB). | Better for wideband AC-coupled gain stages; unsuitable for >1 MΩ source impedances due to input bias current. | Choose AD825ARZ when bandwidth >20 MHz is required and source impedance <100 kΩ; retain OPA132UA/2K5G4 for high-Z, low-noise DC precision. |
Compared with OPA132U, OPA132UA/2K5G4 offers identical performance in a production-optimized tape-and-reel format. Against AD825ARZ, it trades bandwidth for superior input impedance and voltage noise-making it the preferred choice for photodiode amplification, reference buffering, and high-resolution data acquisition where source impedance exceeds 1 MΩ.
Availability
OPA132UA/2K5G4 is available at Aetrix Electronics and suitable for industrial sensor interfaces, precision instrumentation, audio signal conditioning, and high-voltage data acquisition systems requiring stable component supply and long-term manufacturability.
Supply support for OPA132UA/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 delivering analog and embedded processing solutions, with over 90 years of innovation in precision analog ICs and broad industrial portfolio coverage.
The OPA132 series belongs to TI's precision op amp product line, engineered specifically for high-source-impedance, low-noise, wide-bandwidth applications including data acquisition, sensor signal conditioning, and audio front-ends.
FAQ
What is the maximum capacitive load the OPA132UA/2K5G4 can drive while remaining stable?
The OPA132UA/2K5G4 is specified to remain unity-gain stable with capacitive loads up to 100 pF, as verified in Figure 17 of the SBOS054B datasheet. For loads exceeding 100 pF, external isolation resistance (e.g., 10–50 Ω in series with the output) is recommended to maintain phase margin and prevent peaking or oscillation. This capability makes OPA132UA/2K5G4 suitable for driving ADC inputs and long PCB traces without added complexity.
Does the OPA132UA/2K5G4 require external offset voltage trimming in most applications?
No - the OPA132UA/2K5G4 features laser-trimmed input offset voltage (±500 µV max), so external trimming is unnecessary for most applications. Pins 1 and 8 are provided only for cases demanding sub-50 µV offset, such as high-gain DC measurement circuits. Improper use of the trim network may degrade offset drift performance, and TI recommends using it solely to null the amplifier's intrinsic offset, not system-level errors.
Can the OPA132UA/2K5G4 operate from a single +5 V supply?
Yes - the OPA132UA/2K5G4 supports single-supply operation from +5 V (with ground as V–), as its specified supply range is ±2.5 V to ±18 V. In single-supply mode, the input common-mode range extends from (V–) + 2.5 V to (V+) – 2.5 V, and output swing reaches within ~1.2 V of each rail. For rail-to-rail input/output performance, a different amplifier family would be required; OPA132UA/2K5G4 is optimized for dual-supply precision, not rail-sparing topologies.
How does the input bias current of the OPA132UA/2K5G4 behave over temperature?
The OPA132UA/2K5G4 exhibits a typical input bias current of 5 pA at –40°C, rising to ~100 pA at 125°C, per Figure 5 in the SBOS054B datasheet. At 25°C, it remains ≤50 pA max. This predictable, monotonic increase is due to JFET gate leakage and is significantly lower than bipolar-input op amps. For ultra-low-drift designs, minimizing junction temperature via proper layout and reduced supply voltage (e.g., ±3 V) helps maintain sub-10 pA bias current in thermally managed systems.
Is the OPA132UA/2K5G4 pin-compatible with other members of the OPAx132 family?
No - the OPA132UA/2K5G4 (single-channel, SOIC-8) is not pin-compatible with OPA2132 (dual, SOIC-8) or OPA4132 (quad, SOIC-14). While all share identical electrical specifications, their pinouts differ fundamentally: OPA132UA/2K5G4 uses dedicated offset trim pins (1 and 8), whereas dual/quad versions allocate those pins to additional channel I/O. Interchanging packages requires PCB redesign; however, schematic-level functional substitution is valid when channel count and pinout constraints permit.
OPA132UA/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:
- 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:
- 500 µV
- Current - Supply:
- 4mA
- Current - Output / Channel:
- 40 mA
- 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
OPA132UA/2K5G4 FAQ
1.How can I place an order for OPA132UA/2K5G4 through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA132UA/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 OPA132UA/2K5G4 reliable?
The price and inventory of OPA132UA/2K5G4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA132UA/2K5G4 is usually 5 days.
3.What payment methods are accepted for OPA132UA/2K5G4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA132UA/2K5G4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA132UA/2K5G4?
OPA132UA/2K5G4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA132UA/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 OPA132UA/2K5G4?
For technical support, including OPA132UA/2K5G4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA132UA/2K5G4 requirements.
6.How does Aetrix verify that OPA132UA/2K5G4 is sourced from the original manufacturer or authorized distributors?
All OPA132UA/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 OPA132UA/2K5G4 meets industry standards.
7.What is the process for return or replacement of OPA132UA/2K5G4?
All OPA132UA/2K5G4 units undergo pre-shipment inspection (PSI). If there is an issue with OPA132UA/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 OPA132UA/2K5G4 part is unused and in its original packaging.
Return procedure for OPA132UA/2K5G4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
OPA132UA/2K5G4 Tags
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