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Texas Instruments OPA703NA/3K
- Part No.:
- OPA703NA/3K
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SC-74A, SOT-753
- Datasheet:
-
OPA703NA/3K.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:6,808
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Product details
Overview
OPA703NA/3K 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 product, 0.6 V/µs slew rate, and 160 µA quiescent current per amplifier, operating from ±2 V to ±6 V or 4 V to 12 V supplies. It is used in portable sensor interfaces and transducer amplification where supply headroom is constrained.
For engineers reviewing the OPA703NA/3K datasheet, OPA703NA/3K pinout, OPA703NA/3K application, or OPA703NA/3K equivalent, this page provides verified package mapping (SOT23-5), confirmed rail-to-rail I/O swing (to within 40 mV of rails), exact GBW/slew performance at unity gain, temperature-stable offset (±160 µV max), and validated alternatives for low-quiescent-current precision amplification.
Technical Context
The OPA703NA/3K employs a complementary differential input stage enabling rail-to-rail common-mode input range extending 300 mV beyond both supply rails, with no phase inversion under overvoltage conditions when input current is limited. Its class-AB output stage achieves rail-to-rail output swing down to 40 mV from each rail into high-impedance loads.
It is unity-gain stable and specified across –40°C to +85°C with guaranteed open-loop gain ≥100 dB (RL = 20 kΩ), CMRR ≥90 dB full-scale, and PSRR ≥100 µV/V - all while maintaining 1 pA typical input bias current and 45 nV/√Hz input voltage noise density at 1 kHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-Bandwidth Product | 1 MHz - supports stable unity-gain buffer and low-gain signal conditioning up to ~100 kHz with minimal phase margin loss. |
| Slew Rate | 0.6 V/µs - enables clean 10 Vpp output at ≤10 kHz in unity-gain configuration without slewing distortion. |
| Input Offset Voltage | ±160 µV max - ensures ≤1.6 mV error in 10 V full-scale systems, critical for precision sensor front-ends. |
| Quiescent Current | 160 µA per amplifier - allows battery-powered operation >1 year on a single CR2032 cell in always-on sensor nodes. |
| Rail-to-Rail Output Swing | Within 40 mV of V+ and V– (RL = 100 kΩ) - preserves >99% dynamic range in 3.3 V or 5 V single-supply systems. |
| Input Bias Current | 1 pA typical - minimizes voltage error across high-impedance sources (e.g., pH electrodes, photodiodes). |
| Common-Mode Rejection | 90 dB full-scale - rejects >30 kV/V of power-supply ripple or shared-noise coupling in noisy industrial environments. |
Pinout & Package
SOT23-5 surface-mount package (5-pin, 0.95 mm pitch, 2.9 mm × 1.6 mm footprint), RoHS-compliant, MSL Level-2-260°C-1 year, marked "A03".
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUT) | Amplifier output | Class-AB rail-to-rail output capable of sourcing/sinking ±10 mA; connects directly to ADC input or filter network. |
| 2 (–IN) | Inverting input | Differential node with 1 pA bias current; requires matched trace impedance in high-precision inverting configurations. |
| 3 (V–) | Negative supply | Ground reference in single-supply use; must be bypassed with 1 µF tantalum + 1000 pF ceramic capacitor. |
| 4 (V+) | Positive supply | Accepts 4–12 V single or ±2–±6 V dual supply; decoupling required within 5 mm of pin for stability. |
| 5 (+IN) | Non-inverting input | High-impedance node (5 TΩ || 4 pF); supports direct connection to high-Z sensors without loading error. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input | Extends 300 mV beyond V+ and V– - enables accurate sensing of signals near supply rails (e.g., battery voltage monitoring). |
| Unity-gain stability | No external compensation required - simplifies PCB layout for buffers and gain-of-one signal isolation stages. |
| Low input bias current | 1 pA typical - eliminates significant offset drift in high-resistance feedback networks (>10 MΩ) used in integrators or charge amplifiers. |
| Low THD+N | 0.02% at 1 kHz, G = +1 - preserves signal fidelity in audio preamplifiers and data acquisition front-ends. |
| Wide supply range | 4 V to 12 V single or ±2 V to ±6 V dual - supports interoperability across legacy 5 V, modern 3.3 V, and industrial 12 V systems. |
Applications
| Portable Sensor Interface | Transducer Amplifier |
|---|---|
|
Use Scenario: Amplifying millivolt-level outputs from thermocouples, strain gauges, or MEMS accelerometers in handheld medical or IoT devices. IC Role / Device Role / Timing Role: Precision DC-coupled gain stage with rail-to-rail output driving SAR ADC reference inputs. Use Value: 160 µA quiescent current extends battery life; 1 pA input bias prevents offset drift in high-impedance Wheatstone bridge configurations. |
Use Scenario: Conditioning analog outputs from pressure transducers or load cells in industrial field instruments. IC Role / Device Role / Timing Role: Low-drift, low-noise instrumentation amplifier front-end with 90 dB CMRR rejecting common-mode noise on long cables. Use Value: ±160 µV max offset ensures <0.1% FSR error in 100 mV full-scale transducer outputs; rail-to-rail swing maximizes ADC utilization. |
| Active Filter Stage | Test Equipment Signal Buffer |
|
Use Scenario: Implementing 2nd-order Sallen-Key low-pass filters in portable oscilloscope front-ends or spectrum analyzers. IC Role / Device Role / Timing Role: Unity-gain stable op-amp providing precise pole placement with minimal phase shift up to 100 kHz. Use Value: 1 MHz GBW ensures filter response remains accurate within 1% up to 100 kHz; 0.6 V/µs slew avoids distortion on filtered step responses. |
Use Scenario: Isolating DUT signals from measurement equipment in automated test systems with variable load conditions. IC Role / Device Role / Timing Role: Low-output-impedance buffer preventing source loading and maintaining signal integrity during switching events. Use Value: ±10 mA output drive capability handles capacitive loads up to 1000 pF; rail-to-rail swing preserves full-scale test signal amplitude. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision rail-to-rail op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA333AIDBVR | Zero-drift architecture; 0.01 µV/°C offset drift vs. OPA703NA/3K's ±4 µV/°C; 350 µA IQ vs. 160 µA. | Better for DC-critical applications (e.g., weigh scales) but higher power limits battery life in always-on sensors. | Select OPA333AIDBVR only when sub-µV drift is mandatory; otherwise OPA703NA/3K offers superior power/performance balance. |
| MCP6001T-E/OT | Lower GBW (1 MHz same), but lower slew (0.6 V/µs same); 100% tested for rail-to-rail I/O, but CMRR = 70 dB (vs. 90 dB). | Cost-optimized for consumer-grade signal conditioning where moderate CMRR suffices (e.g., basic audio line drivers). | Choose MCP6001T-E/OT for cost-sensitive volume production where 20 dB lower CMRR is acceptable; retain OPA703NA/3K for industrial noise immunity. |
Compared with OPA333AIDBVR and MCP6001T-E/OT, the OPA703NA/3K uniquely balances ultra-low quiescent current (160 µA), high CMRR (90 dB), and guaranteed rail-to-rail I/O in a 5-pin SOT23 - making it optimal for space-constrained, battery-powered precision analog front-ends where noise rejection and supply efficiency are co-prioritized.
Availability
OPA703NA/3K is available at Aetrix Electronics and suitable for portable sensor interfaces, transducer amplification, and active filter design requiring stable component supply, consistent SOT23-5 packaging, and guaranteed –40°C to +85°C operation.
Supply support for OPA703NA/3K 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 series belongs to TI's precision rail-to-rail CMOS op amp product line, designed specifically for low-power, high-accuracy signal conditioning in portable, automotive, and industrial systems where supply voltage headroom is limited.
FAQ
What is the maximum capacitive load the OPA703NA/3K can drive stably?
The OPA703NA/3K can drive up to 1000 pF of pure capacitive load while maintaining stability in unity-gain configuration. For loads exceeding 100 pF, inserting a 10 Ω to 20 Ω series resistor inside the feedback loop (between output and inverting input) reduces ringing without affecting DC accuracy. This behavior is verified in TI's SBOS180A datasheet Figure 5 and typical performance curves.
Does the OPA703NA/3K support single-supply operation below 4 V?
No - the OPA703NA/3K is specified and guaranteed only from 4 V to 12 V for single-supply operation (or ±2 V to ±6 V dual). Operation below 4 V falls outside its qualified range; parameters like GBW, slew rate, and output swing degrade unpredictably, and the device may not meet its published specifications. The absolute minimum operating voltage is 3.6 V, but TI does not guarantee performance there.
Is the OPA703NA/3K pin-compatible with other members of the OPA703 family?
Yes - all SOT23-5 variants in the OPA703 family (e.g., OPA703NA/250, OPA703NA/3K) share identical pinout, package dimensions, and marking "A03". The /3K suffix denotes tape-and-reel packaging (3000 units per reel), not a functional variant. Electrical specs and thermal characteristics remain identical across these ordering variants.
How does the OPA703NA/3K handle input voltages beyond the supply rails?
The OPA703NA/3K features ESD diodes that conduct if inputs exceed V+ or fall below V– by more than ~300 mV. As long as input current is limited to ≤10 mA (e.g., via a series resistor), the device operates safely without phase inversion or latch-up - a key advantage confirmed in SBOS180A Figure 4. This enables robust interfacing with overvoltage-prone sensors.
What is the thermal resistance (θJA) of the OPA703NA/3K in its SOT23-5 package?
The junction-to-ambient thermal resistance (θJA) for the OPA703NA/3K in the SOT23-5 package is 200 °C/W, as specified in the SBOS180A datasheet. This value assumes standard JEDEC 2-layer board conditions (1 sq-in copper pad). Actual thermal performance improves with enhanced PCB copper area or thermal vias, critical for sustained operation near its 150 °C max junction temperature.
OPA703NA/3K Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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/3K FAQ
1.How can I place an order for OPA703NA/3K through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA703NA/3K 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/3K reliable?
The price and inventory of OPA703NA/3K are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA703NA/3K is usually 5 days.
3.What payment methods are accepted for OPA703NA/3K?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA703NA/3K transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA703NA/3K?
OPA703NA/3K orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA703NA/3K 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/3K?
For technical support, including OPA703NA/3K datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA703NA/3K requirements.
6.How does Aetrix verify that OPA703NA/3K is sourced from the original manufacturer or authorized distributors?
All OPA703NA/3K 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/3K meets industry standards.
7.What is the process for return or replacement of OPA703NA/3K?
All OPA703NA/3K units undergo pre-shipment inspection (PSI). If there is an issue with OPA703NA/3K, 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/3K part is unused and in its original packaging.
Return procedure for OPA703NA/3K:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
OPA703NA/3K Tags
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