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Texas Instruments OPA743UA
- Part No.:
- OPA743UA
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA743UA.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,946
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Product details
Overview
OPA743UA from Texas Instruments is a single-channel, rail-to-rail input/output CMOS operational amplifier optimized for 3.5V–12V single-supply or ±1.75V–±6V dual-supply operation. It delivers 7MHz gain-bandwidth, 10V/µs slew rate, 1.1mA quiescent current, and 100mV rail-to-rail output swing into 100kΩ - enabling high-fidelity signal conditioning in LCD gamma correction buffers and portable instrumentation.
For engineers reviewing the OPA743UA datasheet, OPA743UA pinout, OPA743UA application, or OPA743UA equivalent, key selection criteria include its 1pA input bias current, 84dB CMRR at full scale, 0.0008% THD+N at 6kHz, SO-8 package compatibility, and verified performance across –40°C to +85°C industrial temperature range.
Technical Context
The OPA743UA employs a complementary input stage (N- and P-channel differential pairs) to achieve rail-to-rail input common-mode range extending 100mV beyond supply rails. Its class AB output stage supports 20mA continuous output current and drives 1kΩ loads while maintaining ≥86dB open-loop gain.
It is unity-gain stable and features no phase inversion when inputs exceed supply rails-provided input current is limited to ≤10mA via series resistance. The device is fully specified over ±1.75V to ±6V dual supply or 3.5V–12V single supply, with guaranteed AC performance including 9µs 0.1% settling time on a 5V step.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-Bandwidth Product | 7MHz - enables stable closed-loop operation up to ~5MHz in G=+2 configuration with adequate phase margin. |
| Slew Rate | 10V/µs - supports clean 1Vpp signals up to ~1.6MHz without slew-induced distortion. |
| Input Bias Current | 1pA typical - minimizes voltage error in high-impedance sensor interfaces and precision integrators. |
| Output Swing (100kΩ) | Within 100mV of rails - preserves >98% dynamic range in 3.3V or 5V systems with rail-referenced references. |
| Quiescent Current | 1.1mA per amplifier - allows battery-powered operation for >100 hours with 100mAh coin cell. |
| CMRR (full scale) | 84dB - rejects >100× common-mode noise in single-ended front-end stages driving ADCs. |
| THD+N @ 6kHz | 0.0008% - meets audio-grade fidelity requirements for active filters and transducer amplifiers. |
Pinout & Package
OPA743UA is housed in an 8-pin SOIC (SO-8) surface-mount package with standard D-body outline (Package Drawing D), JEDEC MS-012AC, and RoHS-compliant NiPdAu lead finish. Thermal resistance θJA = 150°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (NC) | No-connect terminal | Internally unconnected; must be left floating or tied to ground per layout best practice. |
| 2 (–In) | Inverting input | Differential node accepting feedback or signal; 1pA bias current enables high-Z source interfacing. |
| 3 (+In) | Non-inverting input | Reference or signal input; rail-to-rail common-mode range (V– –0.1V to V+ +0.1V) supports direct sensor connection. |
| 4 (V–) | Negative supply | Accepts ground (single-supply) or negative rail (dual-supply); bypass with 1µF tantalum + 1000pF ceramic. |
| 5 (Out) | Amplifier output | Capable of sourcing/sinking ±20mA; swings to within 100mV of rails into 100kΩ, 325mV into 1kΩ. |
| 6 (NC) | No-connect terminal | Internally unconnected; no routing or termination required. |
| 7 (NC) | No-connect terminal | Internally unconnected; leave unconnected. |
| 8 (V+) | Positive supply | Accepts 3.5–12V (single) or +1.75–+6V (dual); requires local decoupling as specified in datasheet Figure 4. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input and output | Enables full-scale signal handling in low-voltage systems (e.g., 3.3V logic rails) without level-shifting circuitry. |
| 12V analog CMOS process | Delivers 7MHz GBW and 10V/µs slew rate while maintaining ultra-low 1pA input bias current. |
| No phase inversion on overvoltage inputs | Allows safe operation with inputs exceeding supply rails when current-limited to ≤10mA - critical for sensor fault tolerance. |
| Optimized for gamma reference buffering | Drives heavy parallel DAC loads in LCD panels (e.g., 6–8 source drivers) with <325mV output headroom at 1kΩ. |
| Specified from –40°C to +85°C | Guarantees 1.1mA IQ, 84dB CMRR, and 7MHz GBW across full industrial temperature range. |
Applications
| LCD Gamma Correction Reference Buffer | Portable Instrumentation Signal Conditioning |
|---|---|
Use Scenario: Driving parallel strings of internal DACs in TFT-LCD source drivers requiring precise, stable voltage references across 6–8 channels. IC Role / Device Role / Timing Role: High-current, rail-to-rail output buffer for gamma voltage ladder networks operating from 10V supply. Use Value: Delivers 20mA output current and 325mV rail headroom into 1kΩ loads - eliminating need for discrete emitter followers or charge-pump boosters. | Use Scenario: Amplifying low-level sensor outputs (e.g., thermopile, strain gauge) in handheld test equipment powered by single Li-ion cell (3.0–4.2V). IC Role / Device Role / Timing Role: Precision DC-coupled gain stage with ultra-low input bias current and minimal power consumption. Use Value: 1pA IB prevents offset drift in high-impedance bridges; 1.1mA IQ extends battery life without sacrificing 7MHz bandwidth for anti-alias filtering. |
| Automotive Audio Pre-amplifier | Data Acquisition Front-End Driver |
Use Scenario: Low-noise pre-amplification of microphone or line-level signals in automotive infotainment head units with 5V or 12V supply rails. IC Role / Device Role / Timing Role: Unity-gain stable, low-THD+N buffer preceding ADC or digital signal processor. Use Value: 0.0008% THD+N at 6kHz and 30nV/√Hz input voltage noise preserve audio fidelity; rail-to-rail I/O maximizes dynamic range. | Use Scenario: Driving SAR or sigma-delta ADC inputs in industrial data loggers where multiplexed sensors require fast settling and low charge injection. IC Role / Device Role / Timing Role: Track-and-hold buffer with 9µs 0.1% settling time and high capacitive load drive capability. Use Value: 10V/µs slew rate and 7MHz GBW ensure sub-10µs settling for 16-bit conversions; 1000pF capacitive load drive simplifies anti-alias filter integration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA374AIDR | Lower 6.5MHz GBW, 1.6mA IQ, same SO-8 package and rail-to-rail I/O. | Higher power consumption; less suitable for battery-constrained designs requiring 7MHz bandwidth. | Select OPA374AIDR only if 6.5MHz suffices and TI's enhanced ESD protection (4kV HBM) is prioritized over quiescent current. |
| LMV721IDBVR | 3MHz GBW, 1.25mA IQ, 1.2pA IB, SOT-23-5 package - not pin-compatible. | Lower speed limits use in active filters above ~1MHz; smaller footprint trades off thermal performance (θJA = 200°C/W). | Choose LMV721IDBVR for space-constrained PCBs where 3MHz bandwidth and ultra-small size outweigh need for SO-8 layout reuse. |
Compared with OPA374AIDR and LMV721IDBVR, the OPA743UA provides superior bandwidth-efficiency trade-off (7MHz at 1.1mA), verified SO-8 pinout compatibility for drop-in replacement in existing layouts, and tighter production distribution on input offset voltage (±1.5mV max vs ±2.5mV).
Availability
OPA743UA is available at Aetrix Electronics and suitable for LCD panel manufacturing, portable medical instrumentation, automotive infotainment systems, and industrial data acquisition requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for OPA743UA 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 company headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, personal electronics, and communications markets.
The OPA743UA belongs to TI's precision op-amp portfolio designed specifically for high-speed, low-power, rail-to-rail signal conditioning in space- and energy-constrained applications - especially LCD gamma correction, portable test gear, and automotive sensor interfaces.
FAQ
What is the maximum supply voltage rating for the OPA743UA?
The OPA743UA has an absolute maximum supply voltage rating of 13.2V (V+ to V–). Its recommended operating range is 3.5V to 12V for single-supply configurations or ±1.75V to ±6V for dual supplies. Exceeding 13.2V risks permanent damage per the Absolute Maximum Ratings table in SBOS201.
Does the OPA743UA support true rail-to-rail input common-mode range?
Yes - the OPA743UA's input common-mode voltage range extends from (V–) – 0.1V to (V+) + 0.1V at room temperature, achieved via complementary N- and P-channel input stages. This enables direct interfacing with sensors or references referenced to ground or supply rails without external level shifting.
Can the OPA743UA drive a 1000pF capacitive load stably?
Yes, the OPA743UA is characterized to drive up to 1000pF pure capacitive load while maintaining stability. For unity-gain configurations with heavy capacitive loads, TI recommends inserting a 10Ω–20Ω series resistor inside the feedback loop (as shown in Figure 4 of SBOS201) to suppress ringing without degrading DC accuracy.
What is the output voltage swing specification for the OPA743UA into a 1kΩ load?
Into a 1kΩ load, the OPA743UA delivers a minimum output voltage swing of 300mV from each rail (i.e., V– + 0.3V to V+ – 0.3V) at room temperature, with 425–450mV degradation over the full –40°C to +85°C range. This is verified under conditions where open-loop gain remains ≥96dB.
Is the OPA743UA pin-compatible with other op-amps in the SO-8 package?
No - the OPA743UA uses a nonstandard SO-8 pinout with three no-connect (NC) pins (pins 1, 6, and 7). It is not pin-compatible with generic SO-8 op-amps like LM358 or TL072. Layout reuse requires verification against the exact pin mapping shown in the SBOS201 datasheet diagram for SO-8.
OPA743UA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- 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:
- 8-SOIC
OPA743UA FAQ
1.How can I place an order for OPA743UA through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA743UA 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 OPA743UA reliable?
The price and inventory of OPA743UA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA743UA is usually 5 days.
3.What payment methods are accepted for OPA743UA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA743UA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA743UA?
OPA743UA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA743UA 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 OPA743UA?
For technical support, including OPA743UA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA743UA requirements.
6.How does Aetrix verify that OPA743UA is sourced from the original manufacturer or authorized distributors?
All OPA743UA 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 OPA743UA meets industry standards.
7.What is the process for return or replacement of OPA743UA?
All OPA743UA units undergo pre-shipment inspection (PSI). If there is an issue with OPA743UA, 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 OPA743UA part is unused and in its original packaging.
Return procedure for OPA743UA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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