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Texas Instruments OPA2704UA/2K5G4
- Part No.:
- OPA2704UA/2K5G4
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA2704UA/2K5G4.pdf
- Description:
- IC CMOS 2 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,384
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Product details
Overview
OPA2704UA/2K5G4 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 or 4V–12V single supply - enabling precision signal conditioning in portable sensor interfaces and low-power data acquisition systems.
For engineers reviewing the OPA2704UA/2K5G4 datasheet, OPA2704UA/2K5G4 pinout, OPA2704UA/2K5G4 application, or OPA2704UA/2K5G4 equivalent, key selection criteria include its gain-stability requirement (G ≥ 5), rail-to-rail output swing within 40mV of rails at light loads, ultra-low input bias current (1pA), and SOIC-8 packaging with industry-standard pinout for drop-in compatibility in dual-amplifier signal chains.
Technical Context
The OPA2704UA/2K5G4 employs a complementary 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 tailored for stable operation only at closed-loop gains of 5 or greater.
Unlike the unity-gain-stable OPA2703, the OPA2704 variant uses frequency compensation that trades low-gain stability for enhanced dynamic performance: 3× higher GBW and 5× higher slew rate at G = 5, with THD+N maintained at 0.025% at 1kHz. Input voltage noise is 45nV/√Hz and current noise is 2.5fA/√Hz - critical for high-impedance transducer amplification.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-Bandwidth Product | 3MHz at G ≥ 5 - enables stable 100kHz closed-loop bandwidth with gain of 30, suitable for anti-aliasing and active filter stages. |
| Slew Rate | 3V/µs at G = 5 - supports clean 10Vpp output at 100kHz without slewing distortion in sensor front-end buffering. |
| Input Offset Voltage | ±160µV max - ensures ≤0.0032% gain error in 5V full-scale instrumentation amplifier configurations. |
| Quiescent Current | 160µA per amplifier - allows dual-channel operation from coin-cell or energy-harvesting sources with <330µA total supply current. |
| Input Bias Current | 1pA typical - preserves signal integrity when amplifying outputs from high-impedance pH electrodes or piezoelectric sensors (>1GΩ source impedance). |
| Rail-to-Rail Output Swing | Within 40mV of V+ or V− at RL ≥ 100kΩ - maximizes dynamic range in 3.3V or 5V single-supply systems with limited headroom. |
| CMRR | 90dB full-scale - rejects >30k:1 common-mode interference in noisy industrial analog input modules. |
Pinout & Package
OPA2704UA/2K5G4 is housed in an 8-pin SOIC (SO-8) surface-mount package with standard dual-opamp pinout and JEDEC MS-012AC footprint. Thermal resistance θJA is 150°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Inverting Input B (–In B) | High-impedance differential input node for Channel B; accepts signals up to 300mV beyond supply rails. |
| 2 | Non-Inverting Input B (+In B) | High-Z input for Channel B; complements Pin 1 to form fully differential input pair with rail-to-rail common-mode range. |
| 3 | Output B (Out B) | Class-AB rail-to-rail output capable of sourcing/sinking ±10mA; swings to within 40mV of V+ or V− at light loads. |
| 4 | V– (Negative Supply) | Power supply connection for dual-supply operation; also serves as ground reference in single-supply configurations. |
| 5 | Output A (Out A) | Rail-to-rail output for Channel A; electrically isolated from Out B; supports independent loading up to 10mA. |
| 6 | Non-Inverting Input A (+In A) | High-Z input for Channel A; identical electrical characteristics to Pin 2; enables dual-channel synchronous signal processing. |
| 7 | Inverting Input A (–In A) | Differential input for Channel A; matched to Pin 1 for consistent CMRR and offset tracking across both channels. |
| 8 | V+ (Positive Supply) | Power supply connection supporting 4V–12V single or ±2V–±6V dual operation; requires local 1µF + 1000pF bypassing. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail I/O | Enables full utilization of 3.3V or 5V supply rails in single-supply data loggers - no level-shifting circuitry required. |
| G ≥ 5 optimized design | Delivers 3× higher bandwidth than OPA2703 at same gain, reducing settling time to 18µs (0.1%) in G = 5 DAC output buffers. |
| 1pA input bias current | Eliminates significant DC error in high-impedance photodiode transimpedance stages where IB × Rf would otherwise dominate offset. |
| 160µA per amplifier IQ | Supports always-on battery-powered condition monitoring nodes with multi-year runtime on CR2032 cells. |
| –40°C to +85°C guaranteed operation | Validated performance across industrial temperature range - no derating needed for outdoor sensor enclosures or automotive cabin modules. |
Applications
| Portable ECG Front-End | Industrial 4–20mA Loop Receiver |
|---|---|
|
Use Scenario: Amplifying microvolt-level biopotential signals from dry electrodes in handheld cardiac monitors with 3.3V single supply. IC Role / Device Role / Timing Role: Dual-channel OPA2704UA/2K5G4 serves as first-stage instrumentation amplifier gain block (G = 10) and right-leg drive buffer. Use Value: Rail-to-rail output swing preserves 3.0Vpp dynamic range; 1pA bias current prevents electrode polarization drift; 160µA IQ extends battery life. |
Use Scenario: Converting 4–20mA loop current to precise 0–5V analog signal in PLC analog input modules with ±5V supplies. IC Role / Device Role / Timing Role: One channel configures as precision I-to-V converter (Rshunt = 250Ω), second as rail-to-rail output buffer driving ADC reference input. Use Value: ±160µV offset ensures <0.0032% FSR error; 90dB CMRR rejects common-mode noise on long field wiring; SOIC-8 eases layout in dense I/O cards. |
| Low-Power Data Acquisition System | Automotive Cabin Temperature Sensor Interface |
|
Use Scenario: Buffering multiplexed thermistor and RTD bridges in battery-operated environmental data loggers with 16-bit SAR ADC. IC Role / Device Role / Timing Role: Dual OPA2704UA/2K5G4 channels provide G = 5 signal gain and drive 100kΩ ADC input capacitance without external isolation. Use Value: 3MHz GBW ensures <1µs settling to 0.1% for 100ksps sampling; 45nV/√Hz input noise maintains SNR > 90dB at 1kHz. |
Use Scenario: Conditioning NTC thermistor output in HVAC control units operating from 5V vehicle bus with ambient temperature range –40°C to +85°C. IC Role / Device Role / Timing Role: Single OPA2704UA/2K5G4 channel used in G = 5 non-inverting configuration to scale thermistor voltage for 12-bit microcontroller ADC. Use Value: Guaranteed specs over full temp range eliminate calibration drift; 160µA IQ minimizes thermal self-heating error in sealed sensor housings. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-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, same pinout and quiescent current. | Preferred for G = 1–4 circuits (e.g., unity-gain buffers, active filters below 100kHz). | Select OPA2703UA/2K5 when stability at G < 5 is required - not a drop-in replacement for OPA2704UA/2K5G4 in G ≥ 5 designs. |
| MCP6022-E/SN | 2MHz GBW, 1.2V/µs SR, 100µA IQ, 3mV max VOS, same SOIC-8 package. | Higher offset and lower speed limit use in precision DC-coupled paths or >200kHz signal chains. | Choose MCP6022-E/SN only if cost sensitivity outweighs need for sub-200µV offset and 3V/µs slew in battery-constrained designs. |
Compared with OPA2703UA/2K5 and MCP6022-E/SN, the OPA2704UA/2K5G4 uniquely balances ultra-low power (160µA), precision (±160µV VOS), and high-speed capability (3V/µs) specifically for gain ≥5 signal conditioning - making it irreplaceable in space- and energy-constrained 100kHz+ sensor interfaces.
Availability
OPA2704UA/2K5G4 is available at Aetrix Electronics and suitable for portable medical devices, industrial process transmitters, and automotive cabin sensor modules requiring stable component supply with guaranteed long-term manufacturability.
Supply support for OPA2704UA/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 emphasis on reliability, precision, and low-power innovation.
The OPA703/OPA704 family - including OPA2704UA/2K5G4 - was designed for rail-to-rail, micropower signal conditioning in battery-operated and space-constrained systems where dynamic range, accuracy, and supply flexibility are critical.
FAQ
Is OPA2704UA/2K5G4 unity-gain stable?
No, OPA2704UA/2K5G4 is not unity-gain stable. It is internally compensated for stable operation only at closed-loop gains of 5 or greater. Using it at G = 1 or G = 2 risks oscillation and instability. For unity-gain applications, select the pin-compatible OPA2703 series instead - both share identical SOIC-8 packaging and quiescent current but differ in compensation architecture.
What is the maximum capacitive load OPA2704UA/2K5G4 can drive reliably?
OPA2704UA/2K5G4 can drive up to 1000pF of pure capacitive load when configured at G ≥ 5. At G = 5, typical small-signal overshoot remains below 10% even with 1000pF load. For unity-gain configurations - which are not recommended - a series 10Ω–20Ω resistor inside the feedback loop is required to maintain stability with >100pF loads.
Does OPA2704UA/2K5G4 support single-supply operation?
Yes, OPA2704UA/2K5G4 supports true single-supply operation from 4V to 12V. Its rail-to-rail input extends 300mV beyond V– and V+, and rail-to-rail output swings to within 40mV of either rail under light loads - enabling full-scale signal handling in 3.3V or 5V systems without negative supply generation.
What is the meaning of the "G4" suffix in OPA2704UA/2K5G4?
The "G4" suffix in OPA2704UA/2K5G4 indicates TI's green packaging standard: lead-free (Pb-free), RoHS-compliant, and halogen-free construction. It denotes compliance with JEDEC J-STD-020 moisture sensitivity level 2 (260°C peak reflow, 1-year floor life) and confirms the device meets TI's environmental manufacturing requirements.
Can OPA2704UA/2K5G4 replace OPA2704UA/2K5 in existing designs?
Yes, OPA2704UA/2K5G4 is a direct replacement for OPA2704UA/2K5. Both share identical electrical specifications, SOIC-8 package, pinout, and temperature rating (–40°C to +85°C). The "G4" suffix adds RoHS/halogen-free compliance but does not alter performance, layout, or thermal behavior - making it a seamless drop-in upgrade for new production builds.
OPA2704UA/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:
- 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/2K5G4 FAQ
1.How can I place an order for OPA2704UA/2K5G4 through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA2704UA/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 OPA2704UA/2K5G4 reliable?
The price and inventory of OPA2704UA/2K5G4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA2704UA/2K5G4 is usually 5 days.
3.What payment methods are accepted for OPA2704UA/2K5G4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA2704UA/2K5G4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA2704UA/2K5G4?
OPA2704UA/2K5G4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA2704UA/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 OPA2704UA/2K5G4?
For technical support, including OPA2704UA/2K5G4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA2704UA/2K5G4 requirements.
6.How does Aetrix verify that OPA2704UA/2K5G4 is sourced from the original manufacturer or authorized distributors?
All OPA2704UA/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 OPA2704UA/2K5G4 meets industry standards.
7.What is the process for return or replacement of OPA2704UA/2K5G4?
All OPA2704UA/2K5G4 units undergo pre-shipment inspection (PSI). If there is an issue with OPA2704UA/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 OPA2704UA/2K5G4 part is unused and in its original packaging.
Return procedure for OPA2704UA/2K5G4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
OPA2704UA/2K5G4 Tags
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