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Texas Instruments OPA743NA/3KG4
- Part No.:
- OPA743NA/3KG4
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SC-74A, SOT-753
- Datasheet:
-
OPA743NA/3KG4.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,924
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Product details
Overview
OPA743NA/3KG4 from Texas Instruments is a single-channel, rail-to-rail input/output CMOS operational amplifier optimized for 12V operation, delivering 7MHz gain-bandwidth, 10V/µs slew rate, and 1.1mA quiescent current. It features ±1pA input bias current, 84dB CMRR, and 100mV rail-to-rail output swing into 100kΩ - enabling precision buffering in LCD gamma correction and portable instrumentation.
For engineers reviewing the OPA743NA/3KG4 datasheet, OPA743NA/3KG4 pinout, OPA743NA/3KG4 application, or OPA743NA/3KG4 equivalent, key selection criteria include its SOT23-5 package compatibility, 3.5V–12V single-supply range, low-noise (30nV/√Hz) performance, and verified rail-to-rail behavior across –40°C to +85°C industrial temperature range.
Technical Context
The OPA743NA/3KG4 employs a complementary CMOS input stage enabling rail-to-rail input common-mode range extending 100mV beyond supply rails, with a defined transition region between (V+)–2.1V and (V+)–1.4V where both N- and P-channel pairs operate. Its class AB output stage delivers ±20mA output current and supports 1kΩ loads while maintaining >86dB open-loop gain.
Designed for unity-gain stability, it achieves 9µs 0.1% settling time on 5V steps and drives up to 1000pF capacitive loads. Input protection diodes clamp signals exceeding supplies by >300mV, requiring external current limiting to ≤10mA - confirmed in Figure 2 of SBOS201.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-Bandwidth Product | 7MHz - enables stable closed-loop operation up to 100kHz at G=70, suitable for anti-aliasing and active filter stages. |
| Slew Rate | 10V/µs - supports 1Vpp signals up to ~1.6MHz without distortion, critical for fast-settling data acquisition front-ends. |
| Input Bias Current | ±1pA max - minimizes voltage error in high-impedance sensor interfaces (e.g., photodiode transimpedance amps). |
| Output Swing (100kΩ) | Within 100mV of rails - preserves full dynamic range in 3.3V/5V/12V systems, essential for LCD reference buffering. |
| Quiescent Current | 1.1mA per amplifier - enables battery-powered operation >100 hours with typical 100µA sleep-mode microcontrollers. |
| CMRR | 84dB typ - rejects power supply ripple and common-mode noise in single-supply signal conditioning paths. |
| THD+N | 0.0008% at 6kHz - meets audio-grade fidelity requirements for automotive infotainment preamps. |
Pinout & Package
SOT23-5 surface-mount package (DBV), 5-pin, moisture sensitivity level 2 (260°C peak reflow, 1-year floor life), 3.0mm × 1.7mm footprint, thermal resistance θJA = 200°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (V−) | Negative supply rail | Reference for internal biasing; must be bypassed with 1µF tantalum + 1000pF ceramic near pin. |
| 2 (−In) | Inverting input | Differential node accepting signals from (V−)–0.1V to (V+)+0.1V; protected by ESD diodes. |
| 3 (Out) | Amplifier output | Class AB stage capable of ±20mA drive; swings to within 100mV of V+ or V− under light load. |
| 4 (V+) | Positive supply rail | Accepts 3.5V–12V single supply or ±1.75V–±6V dual supply; requires local decoupling. |
| 5 (+In) | Non-inverting input | High-impedance node (5TΩ || 4pF); enables precision voltage follower configurations with minimal loading. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input | Common-mode range extends 100mV beyond V+ and V−, enabling direct interfacing with ADC references and DAC outputs. |
| 12V operation | Specified up to 12V single supply - supports industrial and automotive 12V bus systems without level-shifting. |
| Low THD+N | 0.0008% at 6kHz ensures minimal harmonic contamination in audio and test equipment signal chains. |
| Capacitive load drive | Stable with up to 1000pF load - eliminates need for external isolation resistors in many LCD gamma buffer layouts. |
| No phase inversion | Maintains correct polarity even when inputs exceed supply rails (with current limiting), preventing latch-up in overvoltage sensing. |
Applications
| LCD Gamma Correction | Portable Instrumentation |
|---|---|
Use Scenario: Driving reference voltages for 6-bit grayscale DACs in TFT-LCD source drivers requiring precise 0–10V analog levels. IC Role / Device Role / Timing Role: Precision voltage buffer with rail-to-rail output swing and low output impedance to maintain linearity across 6–8 parallel driver ICs. Use Value: Enables full 10V dynamic range utilization on 12V supplies while sourcing >10mA per channel without gain error. | Use Scenario: Signal conditioning front-end for handheld multimeters and portable oscilloscopes operating from coin-cell or Li-ion batteries. IC Role / Device Role / Timing Role: Low-power, high-input-impedance amplifier for attenuator/attenuator-divider networks feeding SAR ADCs. Use Value: 1.1mA quiescent current extends battery life; ±1pA input bias prevents offset drift in high-Z probe circuits. |
| Automotive Sensor Interface | Active Filter Stage |
Use Scenario: Amplifying low-level outputs from pressure, temperature, or position sensors in engine control units (ECUs) and ADAS modules. IC Role / Device Role / Timing Role: First-stage gain block with high CMRR to reject ignition noise and alternator ripple on 12V vehicle buses. Use Value: 84dB CMRR and 12V operation ensure stable DC accuracy despite ±2V supply transients during cold-crank events. | Use Scenario: Implementing 2nd-order Sallen-Key or MFB low-pass filters in medical ECG monitors and audio codecs. IC Role / Device Role / Timing Role: Unity-gain stable op-amp providing precise pole placement with minimal phase shift up to 70% of GBW. Use Value: 7MHz GBW allows filter cutoff frequencies up to 1MHz with <0.1dB passband ripple and monotonic step response. |
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; 17µV max VOS, 0.02µV/°C drift vs. OPA743NA/3KG4's ±7mV and ±8µV/°C. | Better DC precision but lower 350kHz GBW and 0.16V/µs slew rate - unsuitable for >10kHz AC-coupled signal paths. | Select OPA333AIDBVR only when µV-level offset stability dominates over speed and output drive. |
| LMV721IDBVR | Lower 10V/µs slew rate retained, but 10MHz GBW, higher 1.25mA IQ, and 1.5pA IB; not specified for 12V operation (max VS = 5.5V). | Compatible for 3.3V portable gear but cannot replace OPA743NA/3KG4 in 12V LCD or automotive designs. | Choose LMV721IDBVR only for cost-sensitive 3.3V systems where 12V capability is unnecessary. |
Compared with OPA333AIDBVR and LMV721IDBVR, the OPA743NA/3KG4 uniquely balances 7MHz bandwidth, 12V tolerance, rail-to-rail I/O, and 1.1mA quiescent current - making it irreplaceable in medium-speed, wide-supply industrial and display applications where all four attributes are simultaneously required.
Availability
OPA743NA/3KG4 is available at Aetrix Electronics and suitable for LCD gamma correction, portable instrumentation, automotive sensor interfaces, and active filter design requiring stable component supply across industrial temperature ranges and long production lifecycles.
Supply support for OPA743NA/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 specializing in analog and embedded processing technologies, with decades of expertise in precision amplifiers and high-reliability signal chain solutions.
The OPA743 series belongs to TI's precision op-amp product line, engineered specifically for applications demanding rail-to-rail performance, wide supply flexibility, and robustness in 12V industrial and automotive environments.
FAQ
What is the maximum supply voltage rating for the OPA743NA/3KG4?
The OPA743NA/3KG4 has an absolute maximum supply voltage of 13.2V (V+ to V−), with recommended operating range from 3.5V to 12V for single-supply use. Exceeding 12V may degrade long-term reliability, and operation above 13.2V risks permanent damage per SBOS201 Absolute Maximum Ratings.
Does the OPA743NA/3KG4 support true rail-to-rail input when powered from a 3.5V single supply?
Yes - the OPA743NA/3KG4 input common-mode range extends from (V−)–0.1V to (V+)+0.1V, meaning it accepts signals from –0.1V to 3.6V on a 3.5V supply. This is confirmed in the Electrical Characteristics table under "Common-Mode Voltage Range" and validated in Figure 1 of SBOS201.
Can the OPA743NA/3KG4 drive a 1kΩ load while maintaining rail-to-rail output swing?
At 1kΩ load, the OPA743NA/3KG4 output swings to within 325mV of each rail (per Electrical Characteristics table), not full rail-to-rail. For 100mV swing, load must be ≥100kΩ. This trade-off is explicitly documented in the "Voltage Output Swing from Rail" parameter row.
Is the OPA743NA/3KG4 pin-compatible with other SOT23-5 op-amps like the OPA340 or TLV2461?
No - the OPA743NA/3KG4 uses standard SOT23-5 pinout (V−, −In, Out, V+, +In), but functional compatibility requires verification of supply range, input stage topology, and output drive. The OPA340 (rail-to-rail, 1MHz) and TLV2461 (1.5MHz, 1.2mA IQ) differ significantly in bandwidth and quiescent current, so direct substitution is not assured without circuit validation.
What is the thermal resistance (θJA) of the OPA743NA/3KG4 in its SOT23-5 package?
The OPA743NA/3KG4 in SOT23-5 (DBV) package has a junction-to-ambient thermal resistance of 200°C/W, as specified in the Electrical Characteristics table under "Thermal Resistance". This value assumes JEDEC-standard PCB layout with 1in² copper pad.
OPA743NA/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:
- 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:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
OPA743NA/3KG4 FAQ
1.How can I place an order for OPA743NA/3KG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA743NA/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 OPA743NA/3KG4 reliable?
The price and inventory of OPA743NA/3KG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA743NA/3KG4 is usually 5 days.
3.What payment methods are accepted for OPA743NA/3KG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA743NA/3KG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA743NA/3KG4?
OPA743NA/3KG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA743NA/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 OPA743NA/3KG4?
For technical support, including OPA743NA/3KG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA743NA/3KG4 requirements.
6.How does Aetrix verify that OPA743NA/3KG4 is sourced from the original manufacturer or authorized distributors?
All OPA743NA/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 OPA743NA/3KG4 meets industry standards.
7.What is the process for return or replacement of OPA743NA/3KG4?
All OPA743NA/3KG4 units undergo pre-shipment inspection (PSI). If there is an issue with OPA743NA/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 OPA743NA/3KG4 part is unused and in its original packaging.
Return procedure for OPA743NA/3KG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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