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Texas Instruments OPA703NA/3KG4
- Part No.:
- OPA703NA/3KG4
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SC-74A, SOT-753
- Datasheet:
-
OPA703NA/3KG4.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,225
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Product details
Overview
OPA703NA/3KG4 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 max input offset voltage, and 160 µA quiescent current per amplifier, operating from 4 V to 12 V single supply or ±2 V to ±6 V dual supply. It is used in portable sensor interfaces and battery-powered data acquisition front-ends.
For engineers reviewing the OPA703NA/3KG4 datasheet, OPA703NA/3KG4 pinout, OPA703NA/3KG4 application, or OPA703NA/3KG4 equivalent, key selection criteria include rail-to-rail I/O swing at low supply voltage, ultra-low quiescent current with unity-gain stability, and guaranteed performance over –40°C to +85°C in SOT23-5 packaging.
Technical Context
The OPA703NA/3KG4 employs a complementary differential input stage enabling rail-to-rail common-mode input range (extending 300 mV beyond rails) and a class-AB output stage achieving 40 mV rail-to-rail output swing into 100 kΩ. Its unity-gain stable architecture supports buffer, gain-of-2, and active filter configurations without external compensation.
It features 90 dB full-scale CMRR, 120 dB open-loop gain (RL = 100 kΩ), and 1 pA typical input bias current - critical for high-impedance transducer amplification and precision DC-coupled measurement paths where leakage and offset drift must be minimized.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-Bandwidth Product | 1 MHz - supports stable unity-gain buffers and low-gain signal conditioning up to ~100 kHz with minimal phase margin loss. |
| Slew Rate | 0.6 V/µs - enables accurate reproduction of 100 kHz full-scale sine waves with ≤1% distortion at 1 VPP. |
| Input Offset Voltage | ±160 µV max - ensures ≤1.6 mV error in 10 V full-scale systems, suitable for 12-bit precision applications. |
| Quiescent Current | 160 µA - allows continuous operation for >1 year on a single CR2032 coin cell in always-on sensor nodes. |
| Rail-to-Rail I/O | Input extends (V–) – 0.3 V to (V+) + 0.3 V; output swings to within 40 mV of rails - preserves dynamic range in 3.3 V or 5 V systems. |
| CMRR | 90 dB full-scale - rejects >30 kΩ unbalanced source impedance common-mode noise in industrial sensor bridges. |
| Supply Range | Single: 4 V to 12 V; Dual: ±2 V to ±6 V - interoperable with Li-ion, USB, and legacy ±5 V rails without level-shifting. |
Pinout & Package
SOT23-5 surface-mount package (5-pin, 2.9 mm × 1.6 mm, 1.45 mm height), RoHS-compliant, moisture sensitivity level (MSL) 2–260°C/1 year.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUT) | Amplifier output | Drives loads ≥100 kΩ to within 40 mV of supply rails; requires local 1 µF + 1000 pF bypassing at V+ and V–. |
| 2 (–IN) | Inverting input | High-impedance node (5 TΩ || 4 pF); accepts signals from (V–) – 0.3 V to (V+) + 0.3 V without phase inversion. |
| 3 (V–) | Negative supply | Ground reference for single-supply operation; must be decoupled; ESD diodes clamp inputs to this rail. |
| 4 (V+) | Positive supply | Accepts 4–12 V; quiescent current varies <5% across this range; thermal resistance θJA = 200°C/W. |
| 5 (+IN) | Non-inverting input | Differential pair node with 1 pA bias current; enables high-Z sensor buffering and precision reference followers. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input stage | Complementary N/P-channel input pairs enable full supply-range common-mode operation - eliminates need for level-shifting in low-voltage microcontroller ADC front-ends. |
| Unity-gain stability | No external compensation required for G = +1 to +10 configurations - simplifies PCB layout and reduces BOM count in portable instrumentation. |
| Ultra-low input bias current | 1 pA typical - prevents >1 mV error across 1 GΩ source impedances, enabling direct connection to piezoelectric sensors and pH electrodes. |
| Low offset drift | ±4 µV/°C - maintains <1 LSB error over 0–70°C in 12-bit systems without calibration. |
| Specified over temperature | Guaranteed parameters from –40°C to +85°C - qualified for automotive cabin and industrial control environments without derating. |
Applications
| Portable Sensor Interface | Transducer Signal Conditioning |
|---|---|
Use Scenario: Battery-powered wearable health monitor measuring skin temperature and galvanic skin response using thermistors and bioimpedance electrodes. IC Role / Device Role / Timing Role: Single-supply rail-to-rail op-amp configured as precision non-inverting amplifier and DC-coupled buffer for analog front-end. Use Value: 160 µA quiescent current extends battery life; rail-to-rail I/O maximizes ADC utilization of 3.3 V supply; 1 pA bias current avoids electrode polarization errors. | Use Scenario: Industrial pressure transmitter with silicon piezoresistive bridge requiring low-drift, high-Z excitation and differential amplification. IC Role / Device Role / Timing Role: Instrumentation-grade amplifier in Wheatstone bridge completion and first-stage gain (G = 100). Use Value: ±160 µV offset and 90 dB CMRR reject bridge imbalance and EMI; 120 dB open-loop gain ensures linearity under varying load conditions. |
| Data Acquisition Channel | Automotive Cabin Sensor Node |
Use Scenario: 16-bit SAR ADC driver in modular test equipment capturing slow-varying process signals (e.g., thermocouple outputs). IC Role / Device Role / Timing Role: Unity-gain buffer isolating multiplexer output from ADC input capacitance and charge injection. Use Value: 1 MHz GBW and 0.6 V/µs slew rate settle 16-bit codes in <15 µs; rail-to-rail output ensures full-scale ADC utilization across 0–3.3 V range. | Use Scenario: Occupancy detection module using infrared PIR sensor and ambient light photodiode in vehicle cabin. IC Role / Device Role / Timing Role: Dual-purpose amplifier: one channel for PIR AC-coupled amplification, second for photodiode transimpedance conversion. Use Value: Specified –40°C to +85°C operation ensures reliability; low 1 pA bias current prevents photodiode dark-current errors; 4 V min supply supports start-stop battery profiles. |
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; 0.1 µV/°C offset drift vs. OPA703NA/3KG4's ±4 µV/°C; 350 µA IQ vs. 160 µA. | Better DC precision for <16-bit systems; higher power disqualifies use in multi-year battery applications. | Select OPA333AIDBVR when offset drift dominates error budget; choose OPA703NA/3KG4 when power and cost are primary constraints. |
| MCP6001T-E/OT | Lower bandwidth (1 MHz same), but higher input bias current (100 pA typ); 100 µA IQ; only specified to +70°C (not +85°C). | Not qualified for extended temperature industrial or automotive use; insufficient for high-Z sensor nodes above 10 MΩ. | Select MCP6001T-E/OT for consumer-grade cost-sensitive designs; OPA703NA/3KG4 remains preferred for industrial temperature range and ultra-low bias current. |
Compared with OPA333AIDBVR and MCP6001T-E/OT, the OPA703NA/3KG4 uniquely balances sub-200 µA quiescent current, 1 pA input bias, –40°C to +85°C qualification, and unity-gain stability - making it optimal for battery-powered precision sensing where zero-drift isn't mandatory but leakage and temperature range are critical.
Availability
OPA703NA/3KG4 is available at Aetrix Electronics and suitable for portable medical devices, industrial sensor transmitters, and automotive cabin monitoring systems requiring stable component supply with long-term manufacturability.
Supply support for OPA703NA/3KG4 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 energy efficiency.
The OPA703 series belongs to TI's precision rail-to-rail op-amp product line, designed specifically for low-power, high-impedance signal conditioning in space-constrained, battery-operated, and industrial measurement systems.
FAQ
What is the maximum capacitive load the OPA703NA/3KG4 can drive while maintaining stability?
The OPA703NA/3KG4 can drive up to 1000 pF pure capacitive load in unity-gain configuration. For loads >100 pF, inserting a 10 Ω to 20 Ω series resistor inside the feedback loop improves phase margin and reduces ringing without affecting DC accuracy. This capability makes the OPA703NA/3KG4 suitable for driving ADC input capacitors and long PCB traces in data acquisition systems.
Does the OPA703NA/3KG4 exhibit phase inversion when input voltages exceed the supply rails?
No, the OPA703NA/3KG4 does not exhibit phase inversion when inputs extend beyond the supply rails, provided input current is limited to ≤10 mA - a condition easily met using a series current-limiting resistor. This behavior is confirmed in Figure 4 of the SBOS180A datasheet and enables robust interfacing with overvoltage-tolerant sensors without additional protection circuitry.
What is the output voltage swing specification for the OPA703NA/3KG4 at 20 kΩ load?
At RL = 20 kΩ, the OPA703NA/3KG4 output swings to within 75 mV of each supply rail while maintaining >100 dB open-loop gain. This rail-to-rail performance ensures ≥95% of full-scale dynamic range is usable in 3.3 V or 5 V systems, directly improving effective resolution when driving 12-bit or 16-bit SAR ADCs.
Is the OPA703NA/3KG4 suitable for single-supply operation with a 3.3 V rail?
No - the OPA703NA/3KG4 has a minimum specified single-supply voltage of 4 V. Operation below 4 V is outside guaranteed specifications and may result in degraded GBW, increased offset, or reduced output swing. For 3.3 V systems, consider the OPA333 or TLV2461, which are explicitly characterized down to 2.7 V.
How is the OPA703NA/3KG4 marked on the SOT23-5 package?
The OPA703NA/3KG4 is laser-marked with "A03" on the top surface of the SOT23-5 package, per TI's standard marking convention for the OPA703 family in that package variant. This marking is visible under 20× magnification and aligns with TI's package option addendum for orderable part number OPA703NA/3KG4.
OPA703NA/3KG4 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/3KG4 FAQ
1.How can I place an order for OPA703NA/3KG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA703NA/3KG4 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/3KG4 reliable?
The price and inventory of OPA703NA/3KG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA703NA/3KG4 is usually 5 days.
3.What payment methods are accepted for OPA703NA/3KG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA703NA/3KG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA703NA/3KG4?
OPA703NA/3KG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA703NA/3KG4 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/3KG4?
For technical support, including OPA703NA/3KG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA703NA/3KG4 requirements.
6.How does Aetrix verify that OPA703NA/3KG4 is sourced from the original manufacturer or authorized distributors?
All OPA703NA/3KG4 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/3KG4 meets industry standards.
7.What is the process for return or replacement of OPA703NA/3KG4?
All OPA703NA/3KG4 units undergo pre-shipment inspection (PSI). If there is an issue with OPA703NA/3KG4, 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/3KG4 part is unused and in its original packaging.
Return procedure for OPA703NA/3KG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
OPA703NA/3KG4 Tags
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