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Texas Instruments OPA2704PA
- Part No.:
- OPA2704PA
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
OPA2704PA.pdf
- Description:
- IC CMOS 2 CIRCUIT 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,507
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Product details
Overview
OPA2704PA 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 and high-speed data acquisition front-ends where low power and stable high-gain performance are critical.
For engineers reviewing the OPA2704PA datasheet, OPA2704PA pinout, OPA2704PA application, or OPA2704PA equivalent, key selection considerations include its gain-stability requirement (G ≥ 5), rail-to-rail I/O swing within 40mV of rails under light load, 1pA input bias current, and MSOP-8/SO-8/DIP-8 package compatibility for legacy through-hole or space-constrained surface-mount designs.
Technical Context
The OPA2704PA 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 delivering rail-to-rail output swing down to 40mV from V+ or V− with 100kΩ load. Its internal compensation is tailored for closed-loop gains of 5 or greater, ensuring stability without external compensation while achieving 3MHz GBW and 3V/µs slew rate.
This dual op amp is fully specified over –40°C to +85°C and supports operation down to –55°C. Input protection diodes clamp signals exceeding rails by >300mV, requiring current limiting to ≤10mA - a design constraint critical for interfacing with unbuffered ADC sample-and-hold or transducer outputs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-Bandwidth Product | 3MHz at G ≥ 5 - enables stable amplification of 100kHz signals with 30° phase margin in non-inverting configurations. |
| Slew Rate | 3V/µs - supports 1Vpp full-scale output at 500kHz without slewing distortion in G = 5 circuits. |
| Input Offset Voltage | ±160µV max - contributes ≤0.008% error in 2V full-scale 16-bit DAC buffer applications. |
| Quiescent Current | 160µA per amplifier - allows dual-channel operation from coin-cell or energy-harvesting sources. |
| Rail-to-Rail Output Swing | Within 40mV of rails (RL = 100kΩ) - preserves >99% dynamic range in 3.3V or 5V systems. |
| Input Bias Current | 1pA typical - eliminates significant voltage drop across >10MΩ sensor bridge arms or photodiode feedback networks. |
| CMRR | 90dB full-scale - rejects 10mV common-mode noise as <10µV differential error in single-supply sensor interfaces. |
Pinout & Package
DIP-8 package: 0.3-inch wide, through-hole, industry-standard footprint compatible with legacy prototyping and industrial control PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Out A | Amplifier A output - drives loads up to ±10mA; requires local 1µF + 1000pF bypassing at V+ and V− pins. |
| 2 | –In A | Inverting input of Amp A - high-impedance node; sensitive to layout-induced leakage above 100MΩ. |
| 3 | +In A | Non-inverting input of Amp A - accepts common-mode voltages from (V−) − 0.3V to (V+) + 0.3V. |
| 4 | V− | Negative supply - must be decoupled; sinking path for both amplifiers' quiescent and output current. |
| 5 | +In B | Non-inverting input of Amp B - electrically isolated from Amp A; shares no internal substrate coupling. |
| 6 | –In B | Inverting input of Amp B - identical electrical specs to Pin 2; supports independent feedback networks. |
| 7 | Out B | Amplifier B output - independently buffered; channel separation >100dB at 1kHz prevents crosstalk in dual-sensor systems. |
| 8 | V+ | Positive supply - sourcing path for both amplifiers; thermal resistance θJA = 100°C/W in DIP-8. |
Key Features
| Feature | Design Value |
|---|---|
| Gain-optimized stability | Internally compensated for G ≥ 5 - eliminates need for external compensation capacitors in instrumentation amplifier gain stages. |
| Rail-to-rail input stage | Complementary N/P-channel input pairs - maintains CMRR >70dB across full (V−) − 0.3V to (V+) + 0.3V range, enabling direct single-supply sensor interfacing. |
| Ultra-low input bias current | 1pA typical - avoids gain error in high-Z pH electrode or piezoelectric transducer amplifiers without guard traces. |
| Low-noise precision | 45nV/√Hz input voltage noise at 1kHz - ensures <1µVrms integrated noise in 10kHz bandwidth sensor channels. |
| Robust ESD protection | Diode-clamped inputs rated for ±2kV HBM - survives handling in uncontrolled assembly environments without additional TVS. |
Applications
| Transducer Signal Conditioning | Data Acquisition Front-End |
|---|---|
Use Scenario: Amplifying low-level mV-output strain gauge or thermopile signals in battery-powered IoT sensors. IC Role / Device Role / Timing Role: Dual-channel instrumentation-grade buffer and gain stage, rejecting common-mode noise from long leads. Use Value: 1pA input bias prevents drift in 10MΩ bridge arms; rail-to-rail I/O maximizes ADC utilization in 3.3V systems. | Use Scenario: Driving SAR ADC inputs in portable test equipment requiring 16-bit accuracy at 100kSPS. IC Role / Device Role / Timing Role: Settling-critical driver with 18µs 0.01% settling time at G = 5, matching ADC aperture time. Use Value: 3V/µs slew rate and 3MHz GBW ensure full-scale step settles before next conversion cycle. |
| Portable Medical Instrumentation | Industrial Reference Buffering |
Use Scenario: Low-power ECG front-end amplifying ±5mV biopotentials with high common-mode rejection. IC Role / Device Role / Timing Role: Dual op amp implementing right-leg drive and lead-off detection circuitry. Use Value: 160µA per amplifier enables 24-hour operation on AA batteries; 90dB CMRR suppresses 50/60Hz interference. | Use Scenario: Buffering precision voltage references (e.g., REF5025) for multi-channel DACs in PLC analog output modules. IC Role / Device Role / Timing Role: Low-drift, low-noise unity-gain follower isolating reference from load variations. Use Value: ±160µV offset and 4µV/°C drift minimize reference error across –40°C to +85°C industrial temperature range. |
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 |
|---|---|---|---|
| OPA2704UA | SO-8 package, same electrical specs, 2500-piece tape-and-reel only - no tube option. | Surface-mount assembly only; not suitable for through-hole prototyping or repair. | Select OPA2704UA for automated SMT production; OPA2704PA remains optimal for breadboarding, DIP sockets, or legacy board rework. |
| AD8602ARZ | Unity-gain stable, 8MHz GBW, 5V/µs SR, but higher 500µA IQ and ±600µV VOS - not optimized for G ≥ 5. | Better for general-purpose G = 1–2 buffering; lacks OPA2704PA's low-IQ/high-G efficiency trade-off. | Choose AD8602ARZ when unity-gain stability or higher speed is required; avoid when minimizing supply current at G = 5 is critical. |
Compared with OPA2704UA, the OPA2704PA offers identical performance in a through-hole DIP-8 package enabling manual assembly and field serviceability, while AD8602ARZ trades 3× higher quiescent current for broader gain flexibility - making OPA2704PA the preferred choice for battery-powered, fixed-gain ≥5 signal chains.
Availability
OPA2704PA is available at Aetrix Electronics and suitable for portable medical instrumentation, industrial reference buffering, and transducer signal conditioning requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for OPA2704PA 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 heritage in precision op amp design and manufacturing.
The OPA703/704 family was engineered for ultra-low-power, rail-to-rail precision amplification in space- and energy-constrained systems - targeting sensor interfaces, portable instrumentation, and battery-operated data acquisition where GBW/IQ ratio and input/output swing are decisive.
FAQ
What is the minimum recommended gain for stable operation of the OPA2704PA?
The OPA2704PA is internally compensated for closed-loop gains of 5 or greater. Operating at gains below 5 may cause peaking or instability, especially with capacitive loads. For unity-gain or G = 2 applications, TI recommends the OPA2703PA instead. Always verify phase margin using SPICE models or bench testing when operating near the gain boundary.
Can the OPA2704PA operate from a single 5V supply?
Yes, the OPA2704PA supports single-supply operation from 4V to 12V. With a 5V supply, input common-mode range extends from –0.3V to +5.3V, and output swings to within 40mV of each rail under light load. Ensure input signals remain within absolute maximum ratings and use proper decoupling (1µF tantalum + 1000pF ceramic per supply pin).
What is the thermal resistance (θJA) of the OPA2704PA in its DIP-8 package?
The OPA2704PA in PDIP-8 package has a junction-to-ambient thermal resistance (θJA) of 100°C/W, as specified in the SBOS180A datasheet. This value assumes standard JEDEC 2-layer board conditions. Derate power dissipation accordingly - at 300µA max IQ per amplifier and ±5V supplies, total dissipation is ~3mW, resulting in negligible temperature rise under normal operation.
Does the OPA2704PA feature phase reversal when input voltages exceed the supply rails?
No, the OPA2704PA does not exhibit phase reversal when inputs exceed the supply rails, provided input current is limited to ≤10mA via series resistance. This behavior is confirmed in Figure 4 of the SBOS180A datasheet and stems from its robust ESD diode clamping architecture - a critical reliability feature for interfacing with unconditioned transducer outputs.
How does the OPA2704PA compare to the OPA2703PA in terms of bandwidth and slew rate?
The OPA2704PA provides 3MHz gain-bandwidth product and 3V/µs slew rate at G ≥ 5, whereas the OPA2703PA delivers 1MHz GBW and 0.6V/µs SR with unity-gain stability. The OPA2704PA achieves higher speed by optimizing compensation for higher gains, trading off low-gain flexibility for improved dynamic response - making it ideal for fixed-gain ≥5 signal chains where speed and power efficiency are prioritized.
OPA2704PA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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:
- Through Hole
- Supplier Device Package:
- 8-PDIP
OPA2704PA FAQ
1.How can I place an order for OPA2704PA through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA2704PA 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 OPA2704PA reliable?
The price and inventory of OPA2704PA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA2704PA is usually 5 days.
3.What payment methods are accepted for OPA2704PA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA2704PA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA2704PA?
OPA2704PA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA2704PA 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 OPA2704PA?
For technical support, including OPA2704PA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA2704PA requirements.
6.How does Aetrix verify that OPA2704PA is sourced from the original manufacturer or authorized distributors?
All OPA2704PA 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 OPA2704PA meets industry standards.
7.What is the process for return or replacement of OPA2704PA?
All OPA2704PA units undergo pre-shipment inspection (PSI). If there is an issue with OPA2704PA, 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 OPA2704PA part is unused and in its original packaging.
Return procedure for OPA2704PA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
OPA2704PA Tags
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