Texas Instruments OPA4743UA/2K5G4

Overview

OPA4743UA/2K5G4 from Texas Instruments is a quad rail-to-rail input/output CMOS operational amplifier optimized for 12V single-supply or ±6V dual-supply operation, delivering 7MHz gain-bandwidth, 10V/µs slew rate, and 1.1mA quiescent current per amplifier - enabling high-fidelity gamma reference buffering in LCD source drivers.

For engineers reviewing the OPA4743UA/2K5G4 datasheet, OPA4743UA/2K5G4 pinout, OPA4743UA/2K5G4 application, or OPA4743UA/2K5G4 equivalent, key selection criteria include rail-to-rail I/O swing (≤100mV from rails at light load), ultra-low input bias current (1pA), CMRR of 84dB, 12V absolute max supply rating, and SO-14 package compatibility with industrial temperature range (–40°C to +85°C).

Technical Context

The OPA4743UA/2K5G4 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 are active. Its class AB output stage supports rail-to-rail output swing down to 100mV at 100kΩ load and 325mV at 1kΩ load while maintaining >86dB open-loop gain.

It is unity-gain stable, specified over ±1.75V to ±6V dual supplies or 3.5V to 12V single supply, and features low THD+N (0.0008% at 6kHz), 30nV/√Hz input voltage noise density, and full-spectrum ESD protection with diode-clamped inputs rated for ±0.3V beyond rails (10mA max input current).

Key Specifications

Pinout & Package

OPA4743UA/2K5G4 is packaged in SOIC-14 (SO-14) surface-mount format, 8.65mm × 3.91mm body, 1.27mm pitch, RoHS-compliant NiPdAu lead finish, MSL Level-1 (unlimited floor life), and marked "OPA4743UA".

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad rail-to-rail operational amplifier applications.

Compared with OPA4743EA/250, OPA4743UA/2K5G4 offers identical AC/DC performance but in a larger SO-14 package with higher thermal resistance (150°C/W vs 100°C/W), making it preferable for prototyping or legacy board compatibility; TLV2474IDR trades 7MHz bandwidth and 12V operation for lower quiescent current in 3.3V/5V domains.

Availability

OPA4743UA/2K5G4 is available at Aetrix Electronics and suitable for LCD display manufacturing, automotive sensor modules, and portable medical instrumentation requiring stable component supply with guaranteed long-term availability.

Supply support for OPA4743UA/2K5G4 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, embedded processing, and connectivity technologies, with decades of expertise in high-performance op-amps and precision signal chain solutions.

The OPA743 family - including OPA4743UA/2K5G4 - was designed specifically for high-voltage, rail-to-rail I/O applications in LCD gamma correction, portable instrumentation, and industrial sensing where 12V operation, low bias current, and wide supply flexibility are critical.

FAQ

What is the maximum supply voltage rating for OPA4743UA/2K5G4?

The OPA4743UA/2K5G4 has an absolute maximum supply voltage rating of 13.2V across V+ to V– terminals. It is fully specified and guaranteed for operation from 3.5V to 12V single supply or ±1.75V to ±6V dual supply. Exceeding 13.2V may cause permanent damage, and operation above 12V voids parametric guarantees per the SBOS201 datasheet.

Does OPA4743UA/2K5G4 support true rail-to-rail input common-mode range?

Yes, the OPA4743UA/2K5G4 supports rail-to-rail input with a common-mode voltage range from (V–) – 0.1V to (V+) + 0.1V at room temperature. This is achieved via a complementary input stage (N- and P-channel pairs), enabling direct interfacing with signals that swing beyond the supply rails - provided input current is limited to ≤10mA using series resistors as shown in Figure 2 of SBOS201.

Can OPA4743UA/2K5G4 drive capacitive loads commonly found in LCD gamma reference circuits?

Yes, the OPA4743UA/2K5G4 can drive up to 1000pF pure capacitive load while maintaining stability. For unity-gain configurations driving large capacitors (e.g., 100nF charge reservoirs in LCD gamma buffers), inserting a 20Ω series resistor inside the feedback loop - as shown in Figure 4 of SBOS201 - improves phase margin and reduces ringing without degrading DC accuracy.

What is the guaranteed operating temperature range for OPA4743UA/2K5G4?

The OPA4743UA/2K5G4 is specified and tested over the industrial temperature range of –40°C to +85°C. While its absolute maximum operating temperature extends to +125°C, parametric performance (e.g., offset voltage, CMRR, GBW) is only guaranteed within the –40°C to +85°C range per the Electrical Characteristics table in SBOS201.

How does the channel separation specification impact multi-channel gamma correction designs using OPA4743UA/2K5G4?

The OPA4743UA/2K5G4 provides ≥110dB channel separation at DC and ≥70dB at 1MHz, ensuring minimal crosstalk between independently buffered gamma reference strings. This prevents unintended voltage coupling between grayscale segments - critical for maintaining color fidelity and avoiding vertical banding artifacts in high-resolution TFT-LCD panels.