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Texas Instruments OPA743PA
- Part No.:
- OPA743PA
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
OPA743PA.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,100
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Product details
Overview
OPA743PA from Texas Instruments is a single-channel, rail-to-rail input/output CMOS operational amplifier optimized for 12V operation in LCD gamma correction buffers and portable equipment. It delivers 7MHz gain-bandwidth, 10V/µs slew rate, 1.1mA quiescent current, and full rail-to-rail swing (within 100mV of rails at 100kΩ load) on supplies from 3.5V to 12V (±1.75V to ±6V).
For engineers reviewing the OPA743PA datasheet, OPA743PA pinout, OPA743PA application, or OPA743PA equivalent, this page provides verified package mapping (DIP-8), confirmed pin functions, real-world use cases in LCD reference buffering and transducer amplification, and two validated alternative op-amps with documented functional trade-offs.
Technical Context
The OPA743PA employs a complementary N/P-channel input stage enabling rail-to-rail common-mode range extending 100mV beyond both supply rails, with a defined transition region between (V+)–2.1V and (V+)–1.4V where both pairs conduct. Its class AB output stage drives 1kΩ loads while maintaining ≥86dB open-loop gain and supports stable unity-gain operation.
Designed for low-noise, low-distortion signal conditioning, it achieves 0.0008% THD+N at 6kHz and features 30nV/√Hz input voltage noise density, 2.5fA/√Hz current noise density, and 1pA typical input bias current-enabling high-impedance sensor interfacing without significant error.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-Bandwidth Product | 7MHz - enables stable closed-loop operation up to ~5MHz in G=+2 configuration for anti-aliasing or active filtering. |
| Slew Rate | 10V/µs - supports clean 1Vpp signals up to ~1.6MHz without slew-induced distortion. |
| Input Bias Current | 1pA (typ) - allows direct connection to >1GΩ source impedances (e.g., piezoelectric sensors) with <1mV offset error. |
| Output Swing | Within 100mV of rails (RL = 100kΩ) - preserves full dynamic range in 3.3V or 5V single-supply systems. |
| Quiescent Current | 1.1mA per amplifier - enables battery-powered operation for >100 hours with 100mAh cells. |
| CMRR | 84dB (min) - rejects 6300:1 common-mode interference, critical in noisy automotive sensor front-ends. |
| THD+N | 0.0008% at 6kHz - meets audio-grade fidelity requirements for portable media device line drivers. |
Pinout & Package
DIP-8 package: 0.3-inch wide dual in-line package with through-hole mounting, rated for –40°C to +85°C operation and compatible with standard PCB wave-soldering processes.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Offset Null (NC) | No internal connection; left unconnected per TI design-no offset trim required due to low VOS drift (±8µV/°C). |
| 2 | Inverting Input (–In) | Differential input node; accepts signals from (V–)–0.1V to (V+)+0.1V, enabling true rail-to-rail input operation. |
| 3 | Non-Inverting Input (+In) | Differential input node; same common-mode range as Pin 2, supporting single-supply sensor biasing at mid-rail. |
| 4 | V– (Negative Supply) | Ground or negative rail connection; supports dual-supply (±1.75V to ±6V) or single-supply (3.5V to 12V) configurations. |
| 5 | Output (Out) | Class AB buffered output; delivers ±20mA into resistive loads and swings to within 100mV of V–/V+ under light load. |
| 6 | V+ (Positive Supply) | Positive rail connection; operates up to 12V, enabling direct interface with LCD panel 10V supplies. |
| 7 | Offset Null (NC) | No internal connection; unused-TI specifies no external trimming needed for production-grade performance. |
| 8 | NC | No internal connection; DIP-8 variant uses Pins 1 and 7 for offset null but leaves them unconnected in OPA743PA. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail I/O | Input common-mode extends 100mV beyond rails; output swings to within 100mV of V+/V– at 100kΩ-maximizes signal headroom in 3.3V/5V systems. |
| Low input bias current | 1pA typical enables direct coupling to high-Z sources (e.g., pH electrodes, photodiodes) without guard rings or T-network compensation. |
| 12V operation capability | Rated for 3.5V–12V single supply or ±1.75V–±6V dual supply-supports LCD gamma buffer applications requiring 10V reference drive. |
| Unity-gain stability | Stable with G=+1 configuration and 15pF capacitive load-eliminates need for external compensation in voltage-follower designs. |
| Low THD+N | 0.0008% at 6kHz ensures minimal harmonic contamination in audio line drivers and precision DAC output buffers. |
Applications
| LCD Gamma Correction Reference Buffer | Portable Equipment Signal Conditioning |
|---|---|
|
Use Scenario: Driving 6–8 parallel LCD source driver ICs requiring precise, low-drift analog reference voltages (e.g., GMA1–GMA10) from a 10V supply. IC Role / Device Role / Timing Role: High-current, rail-to-rail output buffer isolating resistive ladder networks from DAC switching transients. Use Value: Delivers ±20mA output current and 325mV rail swing at 1kΩ load-maintains <0.1% gamma error across full grayscale range. |
Use Scenario: Amplifying low-level sensor outputs (e.g., thermopiles, accelerometers) in battery-powered handheld test meters. IC Role / Device Role / Timing Role: Low-power, high-input-impedance transducer amplifier with DC-coupled signal path. Use Value: 1.1mA quiescent current extends 100mAh battery life to >90 hours; 1pA input bias avoids >10mV error with 10MΩ sensor impedance. |
| Automotive Sensor Interface | Active Filter for Data Acquisition |
|
Use Scenario: Front-end amplification of oxygen sensor or knock sensor signals in engine control units operating from 5V–12V vehicle power. IC Role / Device Role / Timing Role: Rail-to-rail input amplifier rejecting battery ripple and alternator noise via high CMRR (84dB). Use Value: 84dB CMRR suppresses 6300:1 common-mode interference; wide supply range accommodates cold-crank (5V) to running (14V) conditions. |
Use Scenario: Implementing 2nd-order Sallen-Key low-pass filters in 16-bit data acquisition systems sampling at 100ksps. IC Role / Device Role / Timing Role: Unity-gain stable, low-noise op-amp providing precise pole placement and minimal phase shift. Use Value: 30nV/√Hz input voltage noise ensures <1LSB noise contribution in 16-bit ADC systems with 10V full-scale range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA340PA | Lower GBW (5.5MHz), higher IQ (1.6mA), same rail-to-rail I/O and DIP-8 package. | Better DC precision (0.25mV VOS max) but reduced bandwidth limits use in >3MHz filter stages. | Select when ultra-low offset dominates over speed; not suitable for 7MHz signal paths. |
| LMV721N | Higher GBW (10MHz), lower IQ (0.65mA), SO-8 only-no DIP-8 variant available. | Superior speed/noise ratio (12nV/√Hz) but lacks 12V rating (max 5.5V); incompatible with LCD 10V supplies. | Choose for 3.3V/5V portable systems needing faster settling; requires PCB redesign for SO-8 footprint. |
Compared with OPA743PA, OPA340PA trades bandwidth for better DC accuracy and higher quiescent current, while LMV721N offers higher speed and lower power but cannot operate above 5.5V-making OPA743PA uniquely suited for 12V LCD gamma correction and automotive 12V sensor interfaces.
Availability
OPA743PA is available at Aetrix Electronics and suitable for LCD gamma correction, portable instrumentation, automotive sensor signal conditioning, and active filter design requiring stable component supply and long-term industrial availability.
Supply support for OPA743PA 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-amp design and manufacturing.
The OPA743PA belongs to TI's high-speed, rail-to-rail CMOS op-amp product line, engineered specifically for 12V-capable, low-power signal conditioning in display systems, portable electronics, and automotive sensor interfaces.
FAQ
What is the maximum supply voltage for OPA743PA?
The OPA743PA supports a maximum total supply voltage of 13.2V (V+ to V–), with absolute maximum ratings allowing operation from 3.5V to 12V single supply or ±1.75V to ±6V dual supply. Exceeding 12V in normal operation risks violating the specified electrical characteristics and may reduce reliability over time. The OPA743PA is explicitly characterized and guaranteed across this full 3.5V–12V range.
Does OPA743PA require external offset nulling components?
No, the OPA743PA does not require external offset nulling. Pins 1 and 7 are labeled "Offset Null" in the DIP-8 package drawing but are internally unconnected (NC) for this device variant. TI specifies no external trimming is needed due to its low input offset voltage (±7mV max) and low drift (±8µV/°C), making the OPA743PA suitable for production systems without calibration steps.
Can OPA743PA drive a 1kΩ load while maintaining rail-to-rail output swing?
Yes, the OPA743PA can drive a 1kΩ load with rail-to-rail output capability, though swing is specified as within 325mV of each rail under those conditions while maintaining ≥86dB open-loop gain. This performance is confirmed in the Electrical Characteristics table and Typical Characteristics curve "Output Voltage Swing vs Output Current", making it suitable for driving medium-impedance LCD reference strings and sensor signal chains.
Is OPA743PA unity-gain stable?
Yes, the OPA743PA is unity-gain stable and fully characterized for G=+1 operation. Its internal compensation ensures stability with capacitive loads up to 15pF, and Figure 4 in the datasheet demonstrates stable step response using a 20Ω series resistor inside the feedback loop for heavier capacitive loads. No external compensation network is required for basic unity-gain follower applications.
What is the thermal resistance (θJA) of the OPA743PA DIP-8 package?
The thermal resistance θJA for the OPA743PA in the DIP-8 package is 100°C/W, as specified in the Electrical Characteristics table under "Thermal Resistance". This value assumes standard JEDEC 2-layer board conditions and enables reliable operation up to +85°C ambient when dissipating ≤350mW (e.g., at ±6V supply with 1.1mA IQ and moderate output loading).
OPA743PA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 1
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 10V/µs
- Gain Bandwidth Product:
- 7 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 1 pA
- Voltage - Input Offset:
- 1.5 mV
- Current - Supply:
- 1.1mA
- Current - Output / Channel:
- 20 mA
- Voltage - Supply Span (Min):
- 3.5 V
- Voltage - Supply Span (Max):
- 12 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
OPA743PA FAQ
1.How can I place an order for OPA743PA through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA743PA 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 OPA743PA reliable?
The price and inventory of OPA743PA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA743PA is usually 5 days.
3.What payment methods are accepted for OPA743PA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA743PA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA743PA?
OPA743PA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA743PA 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 OPA743PA?
For technical support, including OPA743PA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA743PA requirements.
6.How does Aetrix verify that OPA743PA is sourced from the original manufacturer or authorized distributors?
All OPA743PA 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 OPA743PA meets industry standards.
7.What is the process for return or replacement of OPA743PA?
All OPA743PA units undergo pre-shipment inspection (PSI). If there is an issue with OPA743PA, 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 OPA743PA part is unused and in its original packaging.
Return procedure for OPA743PA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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