Texas Instruments OPA743UAG4

Overview

OPA743UAG4 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 precision analog signal conditioning. It delivers 7MHz gain-bandwidth, 10V/µs slew rate, 1.1mA quiescent current, ±1.5mV input offset voltage (typ), and full rail-to-rail swing within 100mV of supply rails under light load - enabling high-dynamic-range buffering in portable and automotive sensor front-ends.

For engineers reviewing the OPA743UAG4 datasheet, OPA743UAG4 pinout, OPA743UAG4 application, or OPA743UAG4 equivalent, key selection criteria include its 3.5V–12V single-supply range, 1pA input bias current, 84dB CMRR at DC, 100mV output swing to rail (RL = 100kΩ), and SOIC-14 package compatibility with industrial temperature range (–40°C to +85°C).

Technical Context

The OPA743UAG4 employs a complementary CMOS input stage enabling rail-to-rail input common-mode range extending 100mV beyond both 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 supports rail-to-rail output swing down to 100mV from rails into 100kΩ loads and maintains >86dB open-loop gain even with 1kΩ loads.

Designed for unity-gain stability, the device features low THD+N (0.0008% at 6kHz), 30nV/√Hz input voltage noise density at 10kHz, and robust capacitive load drive up to 1000pF - making it suitable for driving DAC reference inputs and active filter stages without external compensation.

Key Specifications

Pinout & Package

OPA743UAG4 is housed in a 14-pin SOIC (D) surface-mount package with standard JEDEC outline, 1.27mm pitch, and RoHS-compliant NiPdAu lead finish. Thermal resistance θ_JA is 150°C/W.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar operational amplifier applications.

Compared with OPA4340UA and LMC6484IMX, the OPA743UAG4 offers 7× higher bandwidth and 13× faster slew rate at only 1.5× higher quiescent current - making it uniquely suitable for medium-speed, high-dynamic-range LCD reference buffering where both speed and rail compliance are mandatory.

Availability

OPA743UAG4 is available at Aetrix Electronics and suitable for LCD display manufacturing, automotive sensor module production, and portable test equipment requiring stable component supply with guaranteed long-term availability and traceable sourcing.

Supply support for OPA743UAG4 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-amps and high-reliability automotive-grade components.

The OPA743UAG4 belongs to TI's precision CMOS op-amp product line, engineered specifically for high-voltage, rail-to-rail performance in display timing and industrial signal conditioning applications demanding low distortion and wide supply flexibility.

FAQ

What is the maximum supply voltage rating for the OPA743UAG4?

The OPA743UAG4 has an absolute maximum supply voltage rating of 13.2V across V+ to V–. Its specified operating range is 3.5V to 12V for single-supply use and ±1.75V to ±6V for dual-supply configurations. Operation at 12V is fully characterized and supported over the full –40°C to +85°C temperature range, making it ideal for 12V LCD panel applications where the OPA743UAG4 delivers rail-to-rail output swing and 7MHz bandwidth.

Does the OPA743UAG4 support true rail-to-rail input and output operation?

Yes, the OPA743UAG4 supports true rail-to-rail input and output operation. Its input common-mode voltage range extends 100mV beyond both supply rails, and its output swings to within 100mV of each rail under 100kΩ load conditions. This is achieved via a complementary CMOS input stage and class AB output stage. The OPA743UAG4 maintains these specifications across its full operating temperature range (–40°C to +85°C), enabling direct interfacing with 0–12V DAC outputs in LCD gamma correction circuits without level-shifting components.

What is the input bias current specification for the OPA743UAG4, and why does it matter?

The OPA743UAG4 specifies a maximum input bias current of ±10pA at +25°C and ±1pA typical, with drift under ±10pA over temperature. This ultra-low bias current prevents loading errors in high-impedance circuits such as resistive gamma voltage ladders (often >100kΩ per tap) or thermistor networks. In LCD reference buffering, this ensures <10µV error across a 1MΩ source impedance - critical for maintaining grayscale fidelity. The OPA743UAG4 achieves this using precision CMOS input transistors, distinguishing it from bipolar-input alternatives that would introduce mV-level errors.

Can the OPA743UAG4 drive capacitive loads, and what is the recommended approach?

Yes, the OPA743UAG4 can drive up to 1000pF of pure capacitive load while maintaining stability. For unity-gain configurations driving large capacitive loads (e.g., >100pF), TI recommends inserting a 10Ω–20Ω series resistor inside the feedback loop - as shown in Figure 4 of the SBOS201 datasheet - to isolate the op-amp output from the capacitance and suppress ringing. This technique preserves DC accuracy while improving settling time. The OPA743UAG4's 10V/µs slew rate and 7MHz GBW ensure fast response even with this added resistance, making it effective in LCD reference buffering where 100nF local decoupling capacitors are common.

Is the OPA743UAG4 pin-compatible with other members of the OPA743 family?

No, the OPA743UAG4 is not pin-compatible with the single-channel OPA743 or dual-channel OPA2743. As a quad-channel device in SOIC-14 packaging, the OPA743UAG4 follows the standard OPA4743 pinout (Out A, –In A, +In A, V–, +In B, –In B, Out B, V+, Out C, –In C, +In C, +In D, –In D, Out D). This differs fundamentally from the 5-pin SOT23-5 (OPA743NA) and 8-pin SOIC-8 (OPA743UA, OPA2743UA) variants. Designers must use the correct layout for SOIC-14 and cannot substitute OPA743UAG4 into boards designed for smaller packages without schematic and PCB revision.