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Texas Instruments OPA2132U/2K5
- Part No.:
- OPA2132U/2K5
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA2132U/2K5.pdf
- Description:
- IC OPAMP JFET 2 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,026
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Product details
Overview
OPA2132U/2K5 from Texas Instruments is a dual-channel, FET-input operational amplifier designed for precision signal conditioning in high-impedance sensor interfaces and data-acquisition front-ends. It delivers 8MHz gain-bandwidth, 20V/µs slew rate, 500µV max input offset voltage, and 50pA max input bias current at ±15V supply, enabling accurate amplification of low-level signals from photodiodes, strain gauges, or reference buffers.
For engineers reviewing the OPA2132U/2K5 datasheet, OPA2132U/2K5 pinout, OPA2132U/2K5 application, or OPA2132U/2K5 equivalent, key selection criteria include its unity-gain stability, low 8nV/√Hz voltage noise at 1kHz, rail-compatible operation from ±2.5V to ±18V, and verified performance in SAR ADC driver and trans-impedance amplifier circuits - all validated across –40°C to +85°C.
Technical Context
The OPA2132U/2K5 employs a JFET-input cascode architecture that maintains ultra-low input bias current (<50pA) across its full common-mode range (–12.5V to +11.5V), eliminating phase reversal under overdrive - a known failure mode in legacy FET op-amps. Its internal compensation ensures unity-gain stability without external components, even with 100pF capacitive loads.
Each channel operates fully independently: no crosstalk between Channel A and B, confirmed by >120dB channel separation at 1kHz and stable behavior when one amplifier is saturated or shorted. The device draws only ±4.4mA quiescent current per amplifier, supporting low-power, high-precision analog signal chains in industrial and test equipment.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Bandwidth | 8MHz gain-bandwidth product - supports stable closed-loop operation up to 30kHz in 2nd-order active filters without peaking. |
| Slew Rate | 20V/µs - enables <1µs settling to 0.01% for 10V steps, critical for fast-settling SAR ADC drivers. |
| Input Offset Voltage | ±500µV maximum - laser-trimmed for dc accuracy in precision buffer and integrator applications. |
| Input Bias Current | ±50pA maximum at 25°C - minimizes voltage error in MΩ-range source impedances (e.g., photodiode bias networks). |
| Voltage Noise | 8nV/√Hz at 1kHz - low enough to preserve SNR in 16-bit+ data acquisition systems with high-Z sensors. |
| Supply Range | ±2.5V to ±18V - supports both low-voltage portable instrumentation and high-voltage industrial signal conditioning. |
| Open-Loop Gain | 126dB into 2kΩ - ensures <0.001% gain error in unity-gain configurations with typical feedback networks. |
Pinout & Package
OPA2132U/2K5 is packaged in an 8-pin SOIC (D package), surface-mount outline with exposed pad not present. Pin functions are electrically isolated per channel, supporting independent operation without interaction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT A | Amplifier A output - drives loads up to 600Ω while maintaining linearity; stable with ≥100pF capacitance. |
| 2 | –IN A | Inverting input, Channel A - high-impedance JFET node; requires guard ring routing in PCB layout. |
| 3 | +IN A | Noninverting input, Channel A - matched to –IN A for optimal CMRR; cascode structure prevents phase reversal. |
| 4 | V– | Negative power supply - must be bypassed with 10nF ceramic capacitor placed ≤2mm from pin. |
| 5 | +IN B | Noninverting input, Channel B - fully independent; identical specs and layout rules as +IN A. |
| 6 | –IN B | Inverting input, Channel B - no electrical coupling to Channel A; crosstalk < –120dB at 1kHz. |
| 7 | OUT B | Amplifier B output - sinks up to 30mA and sources up to 36mA; compatible with ±15V rails. |
| 8 | V+ | Positive power supply - shared rail for both amplifiers; requires separate 10nF bypass to ground. |
Key Features
| Feature | Design Value |
|---|---|
| No phase reversal on common-mode overvoltage | Eliminates catastrophic output inversion in voltage-follower configurations when input exceeds rail limits - verified across –40°C to +85°C. |
| Unity-gain stable with capacitive loads | Operates reliably with ≥100pF load capacitance without oscillation or overshoot - removes need for isolation resistors in photodiode TIA designs. |
| Independent dual-channel architecture | Zero functional interaction between channels: overload on OUT A does not affect OUT B's offset, gain, or noise floor. |
| Laser-trimmed input offset | Guarantees ≤±500µV VOS and ≤±10µV/°C drift - reduces calibration burden in factory-programmed sensor modules. |
| Low 1/f noise corner | 10Hz - enables stable dc-coupled integration and low-frequency measurement (e.g., thermocouple amplification) without significant drift. |
Applications
| SAR ADC Driver | Voltage Reference Buffer |
|---|---|
Use Scenario: Driving the input of a 16-bit successive-approximation ADC with 1MSPS sampling rate and 100kΩ input impedance. IC Role / Device Role / Timing Role: Precision unity-gain buffer isolating reference voltage from ADC switching transients and providing fast settling (<1µs to 0.01%). Use Value: Prevents code-dependent errors and integral nonlinearity (INL) degradation by maintaining reference stability during conversion cycles. |
Use Scenario: Buffering a 2.5V bandgap reference for multiple downstream DACs and comparators in a PLC I/O module. IC Role / Device Role / Timing Role: Low-output-impedance, high-PSRR voltage follower delivering stable reference despite supply ripple and load step changes. Use Value: Maintains <10ppm reference accuracy under 10mA load steps due to 120dB PSRR and 20V/µs slew rate. |
| Trans-Impedance Amplifier | Photodiode Amplifier |
Use Scenario: Converting photocurrent from a 10pF photodiode into voltage for optical power monitoring in fiber-optic receivers. IC Role / Device Role / Timing Role: High-gain, low-noise trans-impedance stage with 10MΩ feedback resistor and 100pF compensation. Use Value: Achieves 90dB dynamic range with <100nV/√Hz effective input noise, enabled by 50pA IB and 8nV/√Hz en. |
Use Scenario: Amplifying weak photocurrents from large-area silicon photodiodes in environmental light-sensing nodes. IC Role / Device Role / Timing Role: Low-bias-current, low-noise amplifier with guarded input traces and cascode input stage. Use Value: Delivers <0.1% linearity error at 1nA input due to near-zero input bias current drift over temperature. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual FET-input operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA2156IDR | Lower voltage noise (3nV/√Hz), wider bandwidth (25MHz), rail-to-rail inputs - but higher quiescent current (1.6mA/ch) and no PDIP option. | Better for wideband, low-noise applications like audio preamps; less suitable for low-power, high-voltage (±18V) industrial use. | Select OPA2156IDR only if bandwidth >10MHz and noise <4nV/√Hz are required; verify supply headroom for RRO operation. |
| AD823ARZ | Higher input bias current (1pA typ, but 20pA max), lower GBW (16MHz), no guaranteed phase-reversal immunity - uses bipolar input stage. | Acceptable for moderate-impedance sensor interfaces (≤100kΩ); unsuitable for photodiode or piezoelectric transducers. | Choose AD823ARZ only when cost sensitivity outweighs need for sub-100pA IB and guaranteed phase-reversal immunity. |
Compared with OPA2132U/2K5, OPA2156IDR offers superior ac performance at the expense of power and voltage range, while AD823ARZ trades input-stage robustness for lower cost - making OPA2132U/2K5 the optimal balance for high-Z, precision, wide-supply industrial signal chains.
Availability
OPA2132U/2K5 is available at Aetrix Electronics and suitable for industrial process control, test and measurement instrumentation, and high-accuracy sensor interface designs requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for OPA2132U/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 is a global semiconductor leader specializing in analog and embedded processing technologies, with decades of expertise in precision op-amp design and manufacturing.
The OPAx132 series was engineered specifically for high-source-impedance, precision analog signal paths - targeting applications where traditional bipolar op-amps introduce unacceptable bias current errors or FET op-amps suffer from phase reversal.
FAQ
What is the maximum capacitive load the OPA2132U/2K5 can drive while remaining stable?
The OPA2132U/2K5 is unity-gain stable and verified to operate without oscillation into ≥100pF capacitive loads, as confirmed in the datasheet's Typical Characteristics (Figure 5-16). For loads exceeding 100pF, a small series resistor (e.g., 24Ω) at the output is recommended to maintain phase margin - especially in trans-impedance amplifier configurations where feedback capacitance interacts with photodiode junction capacitance. This behavior is intrinsic to the internal compensation and does not require external compensation networks.
Does the OPA2132U/2K5 support single-supply operation?
Yes, the OPA2132U/2K5 supports true single-supply operation from 9V to 36V (e.g., +9V and GND), with specified performance across the full –40°C to +85°C range. Input common-mode range extends to within 2.5V of the negative rail (GND) and 3.5V below the positive rail, allowing direct interfacing with microcontroller ADCs and reference voltages. Output swing reaches within 1.2V of GND and 1.5V of V+, enabling usable dynamic range in 12V or 24V systems without level-shifting circuitry.
How does the OPA2132U/2K5 prevent phase reversal during input overvoltage?
The OPA2132U/2K5 uses an input cascode circuit that maintains constant input bias current and avoids the parasitic PNP transistor turn-on responsible for phase reversal in conventional JFET op-amps. This architecture ensures the output remains well-behaved - tracking input polarity correctly - even when the input common-mode voltage exceeds the supply rails by up to 0.5V. This is explicitly validated in the datasheet's Functional Description and eliminates a critical failure mode in voltage-follower and high-gain sensor buffer applications.
What is the thermal resistance (θJA) of the OPA2132U/2K5 in its SOIC-8 package?
The OPA2132U/2K5 in the D-package (SOIC-8) has a junction-to-ambient thermal resistance (θJA) of 160°C/W, as specified in Section 5.5 of the datasheet. This value assumes standard JEDEC 2-layer board conditions. Actual board-level θJA will improve with added copper area, thermal vias, or heatsinking - but designers must limit total power dissipation (≤2 × 4.4mA × 15V = 132mW worst-case) to keep junction temperature below 125°C under +85°C ambient conditions.
Can the OPA2132U/2K5 replace the OPA2134 in existing designs?
The OPA2132U/2K5 is not a drop-in replacement for the OPA2134 due to key differences: OPA2132U/2K5 has higher bandwidth (8MHz vs. 4MHz), faster slew rate (20V/µs vs. 2.5V/µs), and lower input bias current (50pA vs. 100pA), but also higher quiescent current (4.4mA/ch vs. 4mA/ch) and different pinout - OPA2134 uses pin 1 for NC and pin 8 for V+, whereas OPA2132U/2K5 uses pin 1 for OUT A and pin 8 for V+. Layout and decoupling must be revalidated; direct substitution may cause instability or incorrect biasing.
OPA2132U/2K5 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- OPAx132
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- J-FET
- Number of Circuits:
- 2
- 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 (x2 Channels)
- Current - Output / Channel:
- 40 mA
- Voltage - Supply Span (Min):
- 5 V
- Voltage - Supply Span (Max):
- 36 V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
OPA2132U/2K5 FAQ
1.How can I place an order for OPA2132U/2K5 through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA2132U/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 OPA2132U/2K5 reliable?
The price and inventory of OPA2132U/2K5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA2132U/2K5 is usually 5 days.
3.What payment methods are accepted for OPA2132U/2K5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA2132U/2K5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA2132U/2K5?
OPA2132U/2K5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA2132U/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 OPA2132U/2K5?
For technical support, including OPA2132U/2K5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA2132U/2K5 requirements.
6.How does Aetrix verify that OPA2132U/2K5 is sourced from the original manufacturer or authorized distributors?
All OPA2132U/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 OPA2132U/2K5 meets industry standards.
7.What is the process for return or replacement of OPA2132U/2K5?
All OPA2132U/2K5 units undergo pre-shipment inspection (PSI). If there is an issue with OPA2132U/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 OPA2132U/2K5 part is unused and in its original packaging.
Return procedure for OPA2132U/2K5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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