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Texas Instruments OPA2704UA/2K5
- Part No.:
- OPA2704UA/2K5
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA2704UA/2K5.pdf
- Description:
- IC CMOS 2 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,712
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Product details
Overview
OPA2704UA/2K5 from Texas Instruments is a dual-channel, rail-to-rail input/output CMOS operational amplifier optimized for non-inverting gains ≥5. It delivers 3MHz gain-bandwidth product, 3V/µs slew rate, 160µA quiescent current per amplifier, ±160µV input offset voltage, and operates from ±2V to ±6V dual supplies or 4V–12V single supply. It is used in precision sensor signal conditioning within automotive security systems and portable data acquisition front-ends.
For engineers reviewing the OPA2704UA/2K5 datasheet, OPA2704UA/2K5 pinout, OPA2704UA/2K5 application, or OPA2704UA/2K5 equivalent, key selection criteria include its gain-stability requirement (G ≥5), rail-to-rail output swing within 40mV of rails at light loads, low 1pA input bias current, and SOIC-8 packaging suitable for space-constrained industrial analog signal chains.
Technical Context
The OPA2704UA/2K5 employs a complementary differential input stage enabling rail-to-rail common-mode input range extending 300mV beyond supply rails, and a Class AB output stage achieving rail-to-rail output swing down to 40mV from V+ or V− under 100kΩ load. Its internal compensation is optimized for closed-loop gains of 5 or greater, ensuring stability without external compensation.
It features full-scale CMRR of 90dB at ±5V supply, PSRR of 100dB, and input voltage noise density of 45nV/√Hz at 1kHz. The device is specified over –40°C to +85°C and supports capacitive load drive up to 1000pF when operating at G ≥5.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-Bandwidth Product | 3MHz - Enables stable operation with ≥5× closed-loop gain while maintaining bandwidth for medium-speed signal conditioning (e.g., sensor amplification before 100ksps ADC). |
| Slew Rate | 3V/µs - Supports fast settling (18µs to 0.1%) for 5V step inputs at G = +5, critical for driving SAR ADC reference buffers or active filter transients. |
| Input Offset Voltage | ±160µV max - Ensures <0.01% gain error in precision 12-bit+ measurement paths without trimming, e.g., thermocouple or bridge sensor interfaces. |
| Quiescent Current | 160µA per amplifier - Allows dual-channel operation from coin-cell or energy-harvesting sources in portable instrumentation and battery-powered test equipment. |
| Rail-to-Rail Output Swing | 40mV from rail (RL = 100kΩ) - Maximizes dynamic range in low-voltage (e.g., +5V or ±2.5V) systems, preserving >99% of available signal swing for high-resolution digitization. |
| Input Bias Current | ±1pA max - Eliminates significant voltage drop across high-impedance sources (e.g., pH electrodes, photodiode TIA feedback networks), preserving accuracy. |
| Common-Mode Rejection | 90dB full-scale - Rejects power-supply ripple and shared-noise coupling in dual-supply configurations, essential for clean signal integrity in mixed-signal PCBs. |
Pinout & Package
OPA2704UA/2K5 is housed in an 8-pin SOIC (SO-8) surface-mount package with standard pinout compatible with industry-wide layout footprints. Thermal resistance θJA is 150°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Out A | Amplifier A output - Drives downstream stages (e.g., ADC input, filter network); rail-to-rail swing enables full utilization of supply headroom. |
| 2 | –In A | Inverting input of Amplifier A - Used in inverting configurations or as feedback node; high impedance (5TΩ || 4pF) minimizes loading on source. |
| 3 | +In A | Non-inverting input of Amplifier A - Accepts high-impedance sensor signals; rail-to-rail common-mode range allows direct connection to ground-referenced or biased sources. |
| 4 | V– | Negative supply pin - Must be bypassed with 1µF tantalum + 1000pF ceramic capacitor to suppress supply noise and ensure stability. |
| 5 | +In B | Non-inverting input of Amplifier B - Independent channel enables dual-path signal processing (e.g., differential pair, dual-sensor interface) without crosstalk. |
| 6 | –In B | Inverting input of Amplifier B - Matches Pin 2 electrically; supports matched gain-setting resistor networks for consistent channel performance. |
| 7 | Out B | Amplifier B output - Electrically identical to Pin 1; enables simultaneous buffering or amplification of two independent analog signals. |
| 8 | V+ | Positive supply pin - Accepts 4V–12V single or ±2V–±6V dual supply; quiescent current remains stable across this range, simplifying power design. |
Key Features
| Feature | Design Value |
|---|---|
| Gain-optimized stability | Internally compensated for stable operation only at closed-loop gains ≥5 - eliminates need for external compensation components while enabling higher bandwidth than unity-gain-stable alternatives. |
| Rail-to-rail I/O | Input common-mode range extends 300mV beyond V+ and V−; output swings to within 40mV of either rail at light loads - preserves maximum signal fidelity in low-voltage systems. |
| Ultra-low input bias current | 1pA typical - prevents error voltage buildup across high-value feedback or source impedances (>1MΩ), critical for precision integrators and electrometer-grade circuits. |
| Low quiescent power | 160µA per amplifier - enables dual-channel analog signal conditioning in always-on, battery-operated devices such as portable gas detectors or wearable health monitors. |
| High DC precision | ±160µV input offset and 90dB CMRR - reduces calibration burden in factory-trimmed systems and maintains accuracy over temperature without software correction. |
Applications
| Automotive Sensor Signal Conditioning | Portable Data Acquisition Front-End |
|---|---|
|
Use Scenario: Amplifying low-level outputs from MEMS accelerometers and pressure sensors in vehicle ADAS modules under 5V single-supply constraints. IC Role / Device Role / Timing Role: Dual-channel non-inverting amplifier (G = 5) providing gain, level-shifting, and drive capability for 16-bit SAR ADC inputs. Use Value: Rail-to-rail output ensures full 0–5V ADC input range utilization; 3MHz GBW supports anti-alias filtering up to ~300kHz without phase lag. |
Use Scenario: Buffering and scaling thermocouple and RTD signals in handheld multimeters and field calibrators powered by AA batteries. IC Role / Device Role / Timing Role: Precision dual op-amp implementing cold-junction compensation and programmable gain stages prior to sigma-delta ADC conversion. Use Value: 160µA per amplifier extends battery life beyond 100 hours; ±160µV offset avoids zero-point drift errors in sub-°C temperature resolution. |
| Industrial Active Filter Stage | Dual-Supply Reference Buffering |
|
Use Scenario: Implementing 2nd-order Sallen-Key low-pass filters in PLC analog I/O modules requiring EMI-resistant signal conditioning. IC Role / Device Role / Timing Role: Dual op-amp configured as unity-gain buffer (Channel A) and filter amplifier (Channel B) with G = 5, leveraging separate channels for isolation. Use Value: 3V/µs slew rate prevents distortion on filtered transients; rail-to-rail input accepts unipolar sensor outputs directly referenced to system ground. |
Use Scenario: Providing low-noise, high-impedance buffered references for quad DACs (e.g., DAC7644) in automated test equipment with bipolar ±2.5V supplies. IC Role / Device Role / Timing Role: Dual op-amp in split-supply follower configuration, one channel for positive reference (+2.5V), one for negative (–2.5V). Use Value: 1pA input bias current prevents reference voltage droop across high-value DAC reference resistors; 90dB CMRR rejects supply coupling into sensitive reference nodes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel rail-to-rail op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA2703UA/2K5 | Unity-gain stable; 1MHz GBW, 0.6V/µs SR - lower speed but usable at any gain including G = 1. | Preferred for unity-gain buffers, low-frequency integrators, or where gain flexibility <5 is required. | Select OPA2703UA/2K5 when circuit topology demands G = 1 or variable gain; avoid for G ≥5 high-speed signal paths where OPA2704UA/2K5's 3MHz bandwidth is needed. |
| MCP6022-E/SN | 2MHz GBW, 1.2V/µs SR, 100µA IQ, 3.5mV VOS - higher offset, lower speed, lower power, same SO-8 package. | Better suited for cost-sensitive, low-precision applications like basic sensor interfacing or LED drivers. | Choose MCP6022-E/SN only if offset and bandwidth requirements are relaxed; not recommended for precision data acquisition where OPA2704UA/2K5's 160µV VOS and 3MHz GBW are critical. |
Compared with OPA2703UA/2K5, the OPA2704UA/2K5 trades unity-gain stability for 3× higher bandwidth and slew rate at G ≥5 - making it superior for high-fidelity active filtering and fast-settling ADC driver stages. Against MCP6022-E/SN, it delivers 10× lower offset and 1.5× higher speed at modestly higher quiescent current, justifying use in metrology-grade designs.
Availability
OPA2704UA/2K5 is available at Aetrix Electronics and suitable for automotive sensor interfaces, portable data acquisition systems, and industrial active filter designs requiring stable component supply, long-term lifecycle support, and RoHS-compliant SOIC-8 packaging.
Supply support for OPA2704UA/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 reliability.
The OPA703/OPA704 family - including OPA2704UA/2K5 - was engineered for low-power, rail-to-rail signal conditioning in battery-operated and space-constrained systems where precision, speed, and supply flexibility are jointly critical.
FAQ
What is the minimum recommended gain for stable operation of the OPA2704UA/2K5?
The OPA2704UA/2K5 is internally compensated for stable operation only at closed-loop gains of 5 or greater. Using it at gains below 5 - including unity gain - risks instability, peaking, or oscillation due to insufficient phase margin. For G < 5 applications, TI specifies the OPA2703UA/2K5 as the appropriate alternative.
Can the OPA2704UA/2K5 operate from a single 5V supply?
Yes, the OPA2704UA/2K5 supports single-supply operation from 4V to 12V. At +5V, it maintains full rail-to-rail input and output swing, 3MHz gain-bandwidth, and 3V/µs slew rate when configured for G ≥5. Input common-mode range extends from –0.3V to +5.3V, allowing direct connection to ground-referenced sensors.
What is the maximum capacitive load the OPA2704UA/2K5 can drive reliably?
The OPA2704UA/2K5 can drive up to 1000pF of pure capacitive load when operating at closed-loop gains of 5 or higher. This capability is enhanced by its gain-optimized compensation - unlike unity-gain-stable amplifiers, its phase margin improves with increasing gain, supporting robust stability into heavy capacitive loads common in ADC input networks and cable-driven outputs.
Does the OPA2704UA/2K5 feature rail-to-rail input with no phase inversion?
Yes, the OPA2704UA/2K5 uses a complementary input stage that enables rail-to-rail common-mode input range (extending 300mV beyond both rails) and guarantees no phase inversion - even when input voltages exceed the supply rails - provided input current is limited to ≤10mA via series resistance, as specified in the absolute maximum ratings.
How does the OPA2704UA/2K5 compare to the OPA2703UA/2K5 in terms of quiescent current and precision?
The OPA2704UA/2K5 and OPA2703UA/2K5 share identical quiescent current (160µA per amplifier), input offset voltage (±160µV max), and input bias current (±1pA max). Their key distinction lies in frequency response and stability: OPA2704UA/2K5 offers 3MHz GBW and 3V/µs SR at G ≥5, whereas OPA2703UA/2K5 provides 1MHz GBW and 0.6V/µs SR with unity-gain stability.
OPA2704UA/2K5 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- CMOS
- Number of Circuits:
- 2
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 3V/µs
- Gain Bandwidth Product:
- 3 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 1 pA
- Voltage - Input Offset:
- 160 µV
- Current - Supply:
- 160µA (x2 Channels)
- Current - Output / Channel:
- 10 mA
- Voltage - Supply Span (Min):
- 4 V
- Voltage - Supply Span (Max):
- 12 V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
OPA2704UA/2K5 FAQ
1.How can I place an order for OPA2704UA/2K5 through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA2704UA/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 OPA2704UA/2K5 reliable?
The price and inventory of OPA2704UA/2K5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA2704UA/2K5 is usually 5 days.
3.What payment methods are accepted for OPA2704UA/2K5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA2704UA/2K5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA2704UA/2K5?
OPA2704UA/2K5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA2704UA/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 OPA2704UA/2K5?
For technical support, including OPA2704UA/2K5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA2704UA/2K5 requirements.
6.How does Aetrix verify that OPA2704UA/2K5 is sourced from the original manufacturer or authorized distributors?
All OPA2704UA/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 OPA2704UA/2K5 meets industry standards.
7.What is the process for return or replacement of OPA2704UA/2K5?
All OPA2704UA/2K5 units undergo pre-shipment inspection (PSI). If there is an issue with OPA2704UA/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 OPA2704UA/2K5 part is unused and in its original packaging.
Return procedure for OPA2704UA/2K5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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