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Texas Instruments OPA2703UA
- Part No.:
- OPA2703UA
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA2703UA.pdf
- Description:
- IC CMOS 2 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:143
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Product details
Overview
OPA2703UA from Texas Instruments is a dual-channel, rail-to-rail input/output CMOS operational amplifier optimized for low-power, precision signal conditioning in single- or dual-supply systems. It delivers 1 MHz gain-bandwidth product, 0.6 V/µs slew rate, ±160 µV max input offset voltage, 160 µA quiescent current per amplifier, and operates from ±2 V to ±6 V (or 4 V to 12 V single supply). It is used in portable instrumentation front-ends where rail-swing headroom and battery efficiency are critical.
For engineers reviewing the OPA2703UA datasheet, OPA2703UA pinout, OPA2703UA application, or OPA2703UA equivalent, key selection criteria include its unity-gain stability, 90 dB full-scale CMRR, 1 pA input bias current, output swing within 40 mV of rails at light load, and SOIC-8 package compatibility with legacy board layouts requiring dual op-amp functionality at <200 µA per channel.
Technical Context
The OPA2703UA employs a complementary differential input stage enabling rail-to-rail common-mode input range extending 300 mV beyond both supply rails, and a class-AB output stage achieving rail-to-rail output swing down to 40 mV from V+ or V– under 100 kΩ load. Its unity-gain stable architecture supports stable operation in buffer, active filter, and transducer amplifier configurations without external compensation.
Specified over –40°C to +85°C, it maintains 100 dB open-loop gain (RL = 20 kΩ), 90 dB CMRR across full input range, and 45 nV/√Hz input voltage noise density at 1 kHz - all while drawing only 160 µA per amplifier from ±5 V supplies. Input protection diodes clamp signals exceeding rails by >300 mV, requiring ≤10 mA current limiting for safe overvoltage tolerance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-Bandwidth Product | 1 MHz - enables stable unity-gain buffering and first-order active filters up to ~100 kHz with predictable phase margin. |
| Slew Rate | 0.6 V/µs - supports 10 Vpp signals at ≤100 kHz without slew-induced distortion in sensor interface applications. |
| Input Offset Voltage | ±160 µV max - ensures ≤1.6 mV error in 10 V full-scale measurement systems without trimming. |
| Quiescent Current | 160 µA per amplifier - allows dual-channel precision amplification in battery-powered devices with multi-year runtime. |
| CMRR | 90 dB full-scale - rejects >30 kΩ unbalanced source impedance effects in bridge sensor readouts. |
| Rail-to-Rail I/O | VCM = (V–) – 0.3 V to (V+) + 0.3 V; VOUT = within 40 mV of rails (RL = 100 kΩ) - maximizes dynamic range in 3.3 V or 5 V systems. |
| Input Bias Current | ±1 pA typ - eliminates significant voltage drop across high-impedance pH or photodiode sources (>1 GΩ). |
Pinout & Package
OPA2703UA is housed in an 8-pin SOIC (SO-8) surface-mount package with standard pinout compatible with industry dual op-amp footprints. Thermal resistance θJA is 150°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Out A | Amplifier A output - drives loads up to ±10 mA; swings rail-to-rail with <40 mV headroom at high-Z. |
| 2 | –In A | Inverting input of Amp A - high-impedance node (5 TΩ || 4 pF); accepts inputs beyond rails if current-limited. |
| 3 | +In A | Non-inverting input of Amp A - identical impedance and rail extension capability as Pin 2. |
| 4 | V– | Negative supply terminal - connects to ground (single supply) or negative rail (dual supply); must be bypassed. |
| 5 | +In B | Non-inverting input of Amp B - electrically isolated from Amp A; shares same input stage architecture. |
| 6 | –In B | Inverting input of Amp B - matches Pin 2 performance; enables independent dual-channel configuration. |
| 7 | Out B | Amplifier B output - fully independent output stage; no crosstalk above –100 dB at DC. |
| 8 | V+ | Positive supply terminal - accepts 4 V to 12 V (single) or ±2 V to ±6 V (dual); requires local 1 µF + 1000 pF bypass. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input | Common-mode range extends 300 mV beyond both supply rails - preserves signal integrity in low-voltage data acquisition. |
| Rail-to-rail output | Swings to within 40 mV of V+ or V– with 100 kΩ load - recovers >99% of available voltage range in 3.3 V systems. |
| Ultra-low input bias current | 1 pA typical - avoids loading errors in high-Z sensor interfaces like piezoelectric accelerometers or ion-selective electrodes. |
| Low quiescent power | 160 µA per amplifier - enables always-on analog front-ends in energy-harvesting or coin-cell-powered IoT nodes. |
| Unity-gain stable | No external compensation required - simplifies PCB layout for buffers and gain-of-one signal conditioning stages. |
| High CMRR at full scale | 90 dB over entire input range - maintains accuracy in noisy industrial environments with long sensor cables. |
Applications
| Portable ECG Front-End | Automotive Cabin Temperature Sensor Interface |
|---|---|
|
Use Scenario: Amplifying microvolt-level biopotential signals from dry electrodes in battery-powered wearable ECG monitors. IC Role / Device Role / Timing Role: Dual-channel instrumentation amplifier front-end: one channel for lead-I differential gain, second for right-leg drive (RLD) feedback. Use Value: Rail-to-rail I/O preserves >98% of 3.3 V supply range; 1 pA input bias prevents electrode polarization drift; 160 µA/channel extends battery life beyond 7 days. |
Use Scenario: Conditioning resistance output from NTC thermistors in HVAC control modules across –40°C to +85°C automotive ambient. IC Role / Device Role / Timing Role: Precision voltage follower and ratiometric reference buffer driving ADC inputs in microcontroller-based climate controllers. Use Value: ±160 µV offset ensures <0.1°C measurement error over temperature; 90 dB CMRR rejects ignition noise coupling into cabin sensor wiring. |
| Handheld Multimeter Analog Back-End | Industrial 4–20 mA Loop-Powered Transmitter |
|
Use Scenario: Digitizing AC/DC voltage, current, and resistance with auto-ranging in compact handheld DMMs using single 9 V battery. IC Role / Device Role / Timing Role: Dual op-amp performing simultaneous signal scaling (channel A) and reference buffer (channel B) for 16-bit SAR ADC. Use Value: 1 MHz GBW supports fast settling (<15 µs) during range switching; rail-to-rail output drives ADC input directly without level-shifting. |
Use Scenario: Isolating and linearizing sensor outputs (e.g., pressure, humidity) before modulating 4–20 mA loop current in hazardous-area field instruments. IC Role / Device Role / Timing Role: Low-power signal conditioner interfacing MEMS sensors to loop driver ICs, operating from loop-derived 12–36 V supply. Use Value: 4 V to 12 V single-supply operation matches loop-powered constraints; 160 µA/channel minimizes burden on loop power budget. |
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 |
|---|---|---|---|
| OPA2333AIDR | Zero-drift architecture; 0.02 µV/°C offset drift vs. OPA2703UA's ±4 µV/°C; 35 µA IQ (lower power) but only 350 kHz GBW. | Better for DC-critical applications like precision weight scales; insufficient bandwidth for >10 kHz sensor signals. | Select OPA2333AIDR when ultra-low drift dominates over speed; choose OPA2703UA when 1 MHz GBW and rail-to-rail I/O are mandatory at moderate power. |
| MCP6022-E/SN | Higher IQ (250 µA), lower CMRR (70 dB), wider offset range (±3 mV), but same SOIC-8 footprint and 1 MHz GBW. | Acceptable for cost-sensitive consumer electronics where 160 µV offset and 90 dB CMRR are not required. | Choose MCP6022-E/SN for non-precision industrial controls; retain OPA2703UA for medical-grade or automotive-qualified designs demanding verified 90 dB CMRR and 1 pA IB. |
Compared with OPA2333AIDR and MCP6022-E/SN, the OPA2703UA uniquely balances 1 MHz bandwidth, 1 pA input bias, 90 dB CMRR, and 160 µA quiescent current in a production-qualified SOIC-8 package - making it optimal for portable test equipment and automotive sensor signal chains where all four parameters are simultaneously constrained.
Availability
OPA2703UA is available at Aetrix Electronics and suitable for portable instrumentation, automotive cabin sensing, and industrial loop-powered transmitters requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for OPA2703UA 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-amps and signal chain solutions.
The OPA703/2703/4703 family was designed specifically for low-power, rail-to-rail precision amplification in space-constrained, battery-operated, and automotive-qualified systems - emphasizing input/output swing, quiescent current, and robustness across temperature.
FAQ
What is the maximum capacitive load the OPA2703UA can drive without instability?
The OPA2703UA can drive up to 1000 pF of pure capacitive load while maintaining stability. For unity-gain configurations with >100 pF loads, inserting a 10 Ω to 20 Ω series resistor between the output and feedback network improves phase margin and reduces ringing - a technique validated in TI's SBOS180A datasheet Figure 5. This behavior is intrinsic to the OPA2703UA's internal compensation and applies across its full operating temperature range.
Does the OPA2703UA exhibit phase inversion when input voltages exceed the supply rails?
No, the OPA2703UA does not exhibit phase inversion when inputs exceed the supply rails, provided input current is limited to ≤10 mA - a condition easily met using a series current-limiting resistor as shown in SBOS180A Figure 3. This behavior is confirmed in the Applications Information section and distinguishes the OPA2703UA from older op-amp architectures that invert output polarity under overvoltage conditions.
Can the OPA2703UA operate from a single 3.3 V supply?
The OPA2703UA is specified for a minimum single-supply voltage of 4 V; operation at 3.3 V is outside its guaranteed specifications and may result in degraded parameters including reduced open-loop gain, increased offset voltage, and compromised rail-to-rail output swing. For 3.3 V systems, TI recommends the OPA333 or OPA376 families - the OPA2703UA requires ≥4 V to meet datasheet performance guarantees.
What is the thermal resistance (θJA) of the OPA2703UA in SOIC-8 package?
The junction-to-ambient thermal resistance (θJA) of the OPA2703UA in SOIC-8 (D) package is 150°C/W under standard JEDEC 2-layer board conditions. This value assumes proper PCB copper pour and thermal vias; actual board-level θJA will vary based on layout. At maximum rated quiescent current (300 µA per amplifier), junction temperature rise remains <45°C above ambient - well within the +150°C absolute maximum rating.
Is the OPA2703UA pin-compatible with other dual op-amps in SOIC-8 packages?
Yes, the OPA2703UA uses the industry-standard SOIC-8 pinout for dual op-amps (Pin 1 = Out A, Pin 2 = –In A, Pin 3 = +In A, Pin 4 = V–, Pin 5 = +In B, Pin 6 = –In B, Pin 7 = Out B, Pin 8 = V+), matching LM2904, TL072, and MCP6022 footprints. However, electrical characteristics - especially input bias current (1 pA vs. 45 nA for LM2904) and supply range - differ significantly; direct replacement requires validation of signal chain requirements.
OPA2703UA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- CMOS
- Number of Circuits:
- 2
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 0.6V/µs
- Gain Bandwidth Product:
- 1 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
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
OPA2703UA FAQ
1.How can I place an order for OPA2703UA through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA2703UA 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 OPA2703UA reliable?
The price and inventory of OPA2703UA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA2703UA is usually 5 days.
3.What payment methods are accepted for OPA2703UA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA2703UA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA2703UA?
OPA2703UA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA2703UA 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 OPA2703UA?
For technical support, including OPA2703UA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA2703UA requirements.
6.How does Aetrix verify that OPA2703UA is sourced from the original manufacturer or authorized distributors?
All OPA2703UA 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 OPA2703UA meets industry standards.
7.What is the process for return or replacement of OPA2703UA?
All OPA2703UA units undergo pre-shipment inspection (PSI). If there is an issue with OPA2703UA, 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 OPA2703UA part is unused and in its original packaging.
Return procedure for OPA2703UA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
OPA2703UA Tags
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