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Texas Instruments OPA703PA
- Part No.:
- OPA703PA
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
OPA703PA.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,476
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Product details
Overview
OPA703PA from Texas Instruments is a single-channel, rail-to-rail input/output CMOS operational amplifier optimized for unity-gain stability, 1 MHz gain-bandwidth product, 0.6 V/µs slew rate, and ultra-low quiescent current (160 µA). It operates from ±2 V to ±6 V dual supplies or 4 V to 12 V single supply and delivers 40 mV rail-to-rail output swing into 100 kΩ - ideal for low-power sensor signal conditioning in automotive and portable instrumentation.
For engineers reviewing the OPA703PA datasheet, OPA703PA pinout, OPA703PA application, or OPA703PA equivalent, key selection criteria include its guaranteed rail-to-rail I/O performance across –40°C to +85°C, 1 pA input bias current, 90 dB full-scale CMRR, and DIP-8 package compatibility with legacy through-hole prototyping and industrial control boards.
Technical Context
The OPA703PA uses a complementary N/P-channel 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 40 mV output swing to rails at light loads while maintaining >80 dB open-loop gain.
Specified for unity-gain stability, it supports capacitive loads up to 1000 pF and includes internal ESD protection diodes on inputs. The device is fully characterized over ±2 V to ±6 V supply range and –40°C to +85°C temperature range, with offset voltage drift of ±4 µV/°C and PSRR of 100 µV/V typical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-Bandwidth Product | 1 MHz - enables stable unity-gain buffer and low-frequency active filtering up to ~100 kHz closed-loop bandwidth |
| Slew Rate | 0.6 V/µs - supports ≤100 kHz full-power sine wave output at 1 Vpp without distortion |
| Input Bias Current | 1 pA - preserves high-impedance sensor node accuracy (e.g., pH electrodes, photodiodes) |
| Input Offset Voltage | ±160 µV max - ensures <1 LSB error in 12-bit data acquisition systems with 2.5 V reference |
| CMRR | 90 dB full-scale - rejects common-mode noise in single-supply transducer interfaces with unbalanced grounds |
| Quiescent Current | 160 µA per amplifier - enables battery operation for >1 year in 10 µA sleep-cycle systems |
| Rail-to-Rail Output Swing | 40 mV from rail (100 kΩ load) - maximizes dynamic range in 3.3 V or 5 V microcontroller ADC front-ends |
Pinout & Package
DIP-8 package (PDIP), 0.3-inch body width, through-hole mounting, RoHS-compliant lead finish (NIPDAU), no moisture sensitivity level (MSL N/A).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Offset Null (not connected in OPA703PA) | No internal connection; left floating per TI datasheet - unused in this variant |
| 2 | Inverting Input (–In) | High-impedance node accepting differential feedback; supports rail-to-rail common-mode input down to V– – 0.3 V |
| 3 | Non-Inverting Input (+In) | High-impedance node for reference or signal source; same rail-to-rail common-mode range as Pin 2 |
| 4 | V– (Negative Supply) | Ground or negative rail connection; must be bypassed with 1 µF tantalum + 1000 pF ceramic |
| 5 | Output (Out) | Class-AB rail-to-rail output capable of ±10 mA drive into resistive loads; swings to within 40 mV of V– or V+ at light loads |
| 6 | V+ (Positive Supply) | Positive rail connection (4–12 V single or ±2–±6 V dual); requires same bypassing as Pin 4 |
| 7 | Offset Null (not connected in OPA703PA) | No internal connection; left floating - not used for offset trim in this package variant |
| 8 | NC (No Connect) | Internally unconnected; must remain unconnected on PCB |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input and output | Enables full dynamic range utilization in low-voltage (3.3 V/5 V) systems without level-shifting circuitry |
| 160 µA quiescent current | Reduces system power budget by >50% vs. comparable precision op amps, critical for always-on sensor nodes |
| 1 pA input bias current | Minimizes voltage error across high-value feedback networks (>10 MΩ), preserving gain accuracy |
| Unity-gain stable | Eliminates need for external compensation components in buffer, follower, and gain-of-one configurations |
| –40°C to +85°C operating range | Qualified for under-hood automotive and industrial control environments without derating |
Applications
| Automotive Sensor Signal Conditioning | Portable Medical Instrumentation |
|---|---|
|
Use Scenario: Amplifying low-level signals from thermistors, pressure sensors, or oxygen sensors in engine control units. IC Role / Device Role / Timing Role: Precision DC-coupled transducer amplifier with rail-to-rail I/O for direct interface to 12-bit ADCs. Use Value: 160 µA IQ extends battery life in portable diagnostic tools; 1 pA IB avoids loading high-impedance sensor elements. |
Use Scenario: Front-end amplification of ECG electrode signals in handheld patient monitors. IC Role / Device Role / Timing Role: Low-noise, low-drift instrumentation amplifier stage before analog filtering and digitization. Use Value: 90 dB CMRR rejects 50/60 Hz mains interference; rail-to-rail output maximizes SNR into 3.3 V ADCs. |
| Industrial Data Acquisition Systems | Test & Measurement Equipment |
|
Use Scenario: Buffering multiplexed sensor channels in programmable logic controller (PLC) analog input modules. IC Role / Device Role / Timing Role: Unity-gain buffer isolating high-impedance multiplexer outputs from ADC sampling capacitance. Use Value: 1 MHz GBW ensures <1 µs settling for 100 kSPS sampling; DIP-8 package simplifies field-replaceable module design. |
Use Scenario: Active filtering and signal scaling in benchtop multimeters and calibration sources. IC Role / Device Role / Timing Role: Precision gain stage in programmable attenuator/amplifier paths with minimal thermal drift. Use Value: ±160 µV VOS and ±4 µV/°C drift ensure stable calibration over ambient temperature shifts. |
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; 0.02 µV/°C offset drift vs. OPA703PA's ±4 µV/°C; 350 nA IQ vs. 160 µA | Better DC precision for <16-bit systems; higher cost and lower speed (350 kHz GBW) | Select OPA333AIDBVR only when sub-µV offset drift is mandatory; OPA703PA preferred for speed/power balance |
| LMV321DR | Higher IQ (80 µA typ. but 170 µA max); 1 MHz GBW; rail-to-rail I/O; no guaranteed 1 pA IB (typ. 10 pA) | Lower cost; less suitable for ultra-high-Z sensor interfaces due to higher input bias current | Choose LMV321DR for cost-sensitive, non-precision applications; OPA703PA remains superior for pA-level bias-critical designs |
Compared with OPA333AIDBVR and LMV321DR, the OPA703PA uniquely balances 1 pA input bias current, 1 MHz bandwidth, and 160 µA quiescent current in a DIP-8 package - making it optimal for legacy-compatible, low-power, high-impedance analog signal chains where zero-drift isn't required.
Availability
OPA703PA is available at Aetrix Electronics and suitable for automotive sensor interfaces, portable medical devices, and industrial data acquisition systems requiring stable component supply with long-term DIP-8 availability.
Supply support for OPA703PA 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 solutions, with decades of expertise in precision op amp design and manufacturing.
The OPA703PA belongs to TI's OPA703/OPA704 series - engineered for rail-to-rail I/O performance in low-power, wide-supply-range applications including automotive, industrial, and portable instrumentation.
FAQ
What is the maximum capacitive load the OPA703PA can drive while remaining stable?
The OPA703PA is specified to drive up to 1000 pF of pure capacitive load while maintaining stability. For unity-gain configurations with heavy capacitive loads, adding a 10 Ω to 20 Ω series resistor inside the feedback loop (between output and inverting input) reduces ringing without compromising DC accuracy. This behavior is confirmed in the SBOS180A datasheet Figure 5 and Typical Characteristics section.
Does the OPA703PA have phase inversion when input voltages exceed the supply rails?
No, the OPA703PA does not exhibit phase inversion when inputs exceed the supply rails - provided input current is limited to ≤10 mA using an external series resistor. This is explicitly documented in the Applications Information section of the SBOS180A datasheet (Figure 4), confirming robust behavior for overvoltage-tolerant front-end designs.
Is the OPA703PA pin-compatible with other op amps in the OPA703 family?
Yes - the OPA703PA shares identical pinout and electrical characteristics with other single-channel OPA703 variants (e.g., OPA703NA, OPA703UA) in DIP-8, SO-8, and SOT-23-5 packages. All OPA703 variants deliver 1 MHz GBW, 0.6 V/µs slew rate, and rail-to-rail I/O; only package and marking differ.
What is the thermal resistance (θJA) of the OPA703PA in its DIP-8 package?
The OPA703PA in PDIP-8 package has a junction-to-ambient thermal resistance (θJA) of 100 °C/W, as specified in the Thermal Resistance table on page 4 of the SBOS180A datasheet. This value assumes standard JEDEC 2-layer board conditions and enables reliable operation up to +85°C ambient without forced airflow.
Can the OPA703PA operate from a single 3.3 V supply?
No - the OPA703PA has a minimum specified single-supply voltage of 4 V (per Absolute Maximum Ratings and Electrical Characteristics tables). Operation below 4 V is not guaranteed and may result in degraded rail-to-rail output swing, reduced open-loop gain, or instability. For 3.3 V systems, consider TI's OPA333 or OPA320 families instead.
OPA703PA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Bulk
- 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:
- Through Hole
- Supplier Device Package:
- 8-PDIP
OPA703PA FAQ
1.How can I place an order for OPA703PA through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA703PA 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 OPA703PA reliable?
The price and inventory of OPA703PA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA703PA is usually 5 days.
3.What payment methods are accepted for OPA703PA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA703PA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA703PA?
OPA703PA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA703PA 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 OPA703PA?
For technical support, including OPA703PA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA703PA requirements.
6.How does Aetrix verify that OPA703PA is sourced from the original manufacturer or authorized distributors?
All OPA703PA 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 OPA703PA meets industry standards.
7.What is the process for return or replacement of OPA703PA?
All OPA703PA units undergo pre-shipment inspection (PSI). If there is an issue with OPA703PA, 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 OPA703PA part is unused and in its original packaging.
Return procedure for OPA703PA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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