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Texas Instruments OPA703NA/250G4
- Part No.:
- OPA703NA/250G4
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SC-74A, SOT-753
- Datasheet:
-
OPA703NA/250G4.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,133
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Product details
Overview
OPA703NA/250G4 from Texas Instruments is a single-channel, rail-to-rail input/output CMOS operational amplifier optimized for low-power, medium-speed signal conditioning. It delivers 1 MHz gain-bandwidth, 0.6 V/µs slew rate, ±160 µV input offset voltage, 160 µA quiescent current per amplifier, and operates from 4 V to 12 V single supply (±2 V to ±6 V dual). It is widely used in portable sensor interfaces and data acquisition front-ends where supply headroom and precision are constrained.
For engineers reviewing the OPA703NA/250G4 datasheet, OPA703NA/250G4 pinout, OPA703NA/250G4 application, or OPA703NA/250G4 equivalent, key selection criteria include unity-gain stability, rail-to-rail swing at <200 µA IQ, input bias current ≤1 pA, output swing within 40 mV of rails under light load, and SOT23-5 packaging for space-constrained PCB layouts.
Technical Context
The OPA703NA/250G4 employs a complementary differential input stage enabling rail-to-rail common-mode input range extending 300 mV beyond both supply rails. Its class-AB output stage achieves rail-to-rail output swing-within 40 mV of V+ or V− with 100 kΩ load-while maintaining >100 dB open-loop gain and 90 dB full-scale CMRR.
It is unity-gain stable and specified over –40°C to +85°C. Unlike the higher-speed OPA704 variant, the OPA703NA/250G4 is optimized for G = 1 to 4 applications, offering superior capacitive load drive (up to 1000 pF) and no phase inversion when inputs exceed supplies (with current limiting).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-Bandwidth Product | 1 MHz - supports stable closed-loop operation up to ~800 kHz at G = 1 with adequate phase margin |
| Slew Rate | 0.6 V/µs - enables clean 100 kHz full-scale sine output with ≤0.1% THD+N into 20 kΩ |
| Input Offset Voltage | ±160 µV (max) - ensures ≤1.6 mV error in 10 V full-scale measurement systems |
| Quiescent Current | 160 µA - allows battery-powered operation >1 year on a 200 mAh coin cell in sleep-wake duty cycles |
| Input Bias Current | ±1 pA - preserves signal integrity in high-impedance pH, photodiode, or piezoelectric sensor interfaces |
| Output Swing (vs Rail) | 40 mV (min) into 100 kΩ - maintains >99% dynamic range with 5 V supply and 0–5 V ADC reference |
| CMRR | 90 dB (full scale) - rejects >30 mV of common-mode noise in single-supply transducer amplifiers |
Pinout & Package
SOT23-5 surface-mount package (5-pin, 2.9 mm × 1.6 mm footprint), RoHS-compliant, moisture sensitivity level (MSL) 2 (260°C peak reflow, 1-year floor life).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUT) | Amplifier output | Class-AB rail-to-rail driver capable of sourcing/sinking ±10 mA; connects directly to ADC input or filter network |
| 2 (–IN) | Inverting input | High-impedance node (5 TΩ || 4 pF); requires guarding in microvolt-level sensor applications |
| 3 (+IN) | Non-inverting input | Complementary input pair enables operation down to V– – 0.3 V and up to V+ + 0.3 V |
| 4 (V–) | Negative supply | Accepts ground (single supply) or negative rail (dual supply); must be bypassed with 1 µF tantalum + 1000 pF ceramic |
| 5 (V+) | Positive supply | Supports 4 V to 12 V; IQ remains stable across full range; PSRR = 100 µV/V typical |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail I/O | Enables full utilization of 3.3 V or 5 V ADC reference without level-shifting circuitry |
| 160 µA quiescent current | Permits integration into always-on sensor nodes while meeting <1 µA system sleep budgets via shutdown control |
| 1 pA input bias current | Eliminates guard-ring design complexity in 1 GΩ+ source impedance applications (e.g., ion-selective electrodes) |
| Unity-gain stability | Guarantees stable operation in buffer, active filter, and transimpedance configurations without external compensation |
| No phase inversion | Prevents catastrophic output latch-up during power sequencing or transient overvoltage events at inputs |
Applications
| Portable Sensor Interface | Transducer Signal Conditioning |
|---|---|
Use Scenario: Battery-powered wearable device measuring temperature, humidity, and motion using analog-output sensors. IC Role / Device Role / Timing Role: Single-supply rail-to-rail op amp buffering and amplifying low-level sensor outputs prior to SAR ADC sampling. Use Value: 160 µA IQ extends battery life; rail-to-rail I/O maximizes SNR with 3.3 V supply; 1 pA IB avoids sensor loading errors. | Use Scenario: Industrial pressure transmitter with millivolt-output strain gauge bridge. IC Role / Device Role / Timing Role: Precision instrumentation amplifier front-end stage providing gain and common-mode rejection before digitization. Use Value: 90 dB CMRR suppresses supply-induced noise; ±160 µV VOS minimizes zero-point calibration drift; 40 mV rail swing preserves full bridge dynamic range. |
| Data Acquisition Channel | Automotive Cabin Sensor Node |
Use Scenario: Multi-channel industrial DAQ system acquiring thermocouple, RTD, and voltage signals at ≤10 kSPS. IC Role / Device Role / Timing Role: Input buffer and anti-aliasing filter driver for successive-approximation ADC with switched-capacitor input. Use Value: Low 0.6 V/µs slew rate matches typical SAR ADC acquisition timing; unity-gain stability prevents oscillation during charge redistribution. | Use Scenario: In-cabin air quality monitor integrating CO₂, VOC, and humidity sensors in automotive infotainment module. IC Role / Device Role / Timing Role: Low-power signal conditioner for analog sensor outputs operating across –40°C to +85°C ambient range. Use Value: Specified performance over full automotive temperature range; 160 µA IQ reduces thermal load in sealed enclosure; ESD-hardened inputs withstand board handling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA333AIDBVR | Zero-drift architecture; 17 µV max VOS; 17 µA IQ; 350 kHz GBW | Better DC accuracy but lower bandwidth and slew rate; not unity-gain stable in all variants | Select for ultra-low offset-critical DC applications (e.g., precision weigh scales); avoid for AC-coupled or fast-settling uses |
| MCP6001T-E/OT | General-purpose CMOS op amp; 2.8 MHz GBW; 1.2 V/µs SR; 100 µA IQ; 1.6 mV VOS | Higher speed and lower cost, but 10× worse offset and no guaranteed rail-to-rail output swing near rails | Select for cost-sensitive, non-precision applications where 1.6 mV offset is acceptable and supply >2.7 V |
Compared with OPA333AIDBVR and MCP6001T-E/OT, the OPA703NA/250G4 uniquely balances ultra-low IQ, rail-to-rail I/O, unity-gain stability, and sub-microvolt offset-making it optimal for portable, battery-constrained, medium-bandwidth analog front-ends requiring both precision and efficiency.
Availability
OPA703NA/250G4 is available at Aetrix Electronics and suitable for portable sensor interfaces, transducer signal conditioning, and data acquisition systems requiring stable component supply, long-term manufacturability, and guaranteed parametric performance over –40°C to +85°C.
Supply support for OPA703NA/250G4 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 decades of expertise in precision op amps and low-power signal chain ICs.
The OPA703 series belongs to TI's precision, low-power CMOS op amp product line, designed specifically for battery-operated instrumentation, portable medical devices, and industrial sensing where rail-to-rail operation and microamp quiescent current are mandatory.
FAQ
What is the maximum capacitive load the OPA703NA/250G4 can drive without instability?
The OPA703NA/250G4 can drive up to 1000 pF of pure capacitive load while maintaining stability in unity-gain configuration. For loads >100 pF, adding a 10 Ω to 20 Ω series resistor inside the feedback loop (between output and inverting input) improves phase margin and reduces ringing-without degrading DC accuracy. This capability is confirmed in the SBOS180A datasheet Figure 5 and "Capacitive Load and Stability" section.
Does the OPA703NA/250G4 support true rail-to-rail output swing under all load conditions?
Yes-the OPA703NA/250G4 achieves rail-to-rail output swing within 40 mV of V+ or V− when driving ≥100 kΩ loads, and within 75 mV under 20 kΩ loads while maintaining >100 dB open-loop gain. Output swing degrades to 150 mV under 5 kΩ loads. These values are measured and guaranteed per the SBOS180A Electrical Characteristics table under "Voltage Output Swing from Rail" and validated across –40°C to +85°C.
Can the OPA703NA/250G4 operate from a 3.3 V single supply?
No-the OPA703NA/250G4 has a minimum specified single-supply voltage of 4 V. While it may function at 3.3 V in some lab conditions, TI does not guarantee performance (including GBW, SR, CMRR, or output swing) below 4 V. For 3.3 V systems, consider the OPA333 or TLV2461, which are explicitly characterized down to 1.8 V or 2.7 V respectively.
Is the OPA703NA/250G4 pin-compatible with other SOT23-5 op amps like the LMV321?
No-the OPA703NA/250G4 uses TI's standard SOT23-5 pinout (OUT, –IN, +IN, V–, V+), but LMV321 follows a different pin assignment (V+, OUT, –IN, +IN, V–). Swapping them without PCB revision will cause functional failure. Always verify pin mapping using the official package drawings: OPA703NA/250G4 uses DBV package drawing SLMS139, LMV321 uses DCK.
What is the thermal resistance (θJA) of the OPA703NA/250G4 in its SOT23-5 package?
The junction-to-ambient thermal resistance (θJA) for the OPA703NA/250G4 in the SOT23-5 (DBV) package is 200°C/W, as specified in the SBOS180A datasheet Absolute Maximum Ratings table. This value assumes standard JEDEC 2-layer board conditions (1 inch² copper pad per side). Actual board layout, copper area, and airflow significantly affect real-world thermal performance.
OPA703NA/250G4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 1
- 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
- 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:
- SOT-23-5
OPA703NA/250G4 FAQ
1.How can I place an order for OPA703NA/250G4 through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA703NA/250G4 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 OPA703NA/250G4 reliable?
The price and inventory of OPA703NA/250G4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA703NA/250G4 is usually 5 days.
3.What payment methods are accepted for OPA703NA/250G4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA703NA/250G4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA703NA/250G4?
OPA703NA/250G4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA703NA/250G4 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 OPA703NA/250G4?
For technical support, including OPA703NA/250G4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA703NA/250G4 requirements.
6.How does Aetrix verify that OPA703NA/250G4 is sourced from the original manufacturer or authorized distributors?
All OPA703NA/250G4 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 OPA703NA/250G4 meets industry standards.
7.What is the process for return or replacement of OPA703NA/250G4?
All OPA703NA/250G4 units undergo pre-shipment inspection (PSI). If there is an issue with OPA703NA/250G4, 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 OPA703NA/250G4 part is unused and in its original packaging.
Return procedure for OPA703NA/250G4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
OPA703NA/250G4 Tags
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