Texas Instruments OPA4310IDR

Overview

OPA4310IDR from Texas Instruments is a quad-channel, rail-to-rail input/output operational amplifier optimized for low-voltage (1.5V to 5.5V) operation with ±150mA typical short-circuit output current, 3MHz gain-bandwidth product at 5.5V, and 0.9µs fast enable time from shutdown - enabling high-current buffering in optical modules and LED drivers.

For engineers reviewing the OPA4310IDR datasheet, OPA4310IDR pinout, OPA4310IDR application, or OPA4310IDR equivalent, key selection criteria include its 165µA/ch quiescent current, ±250µV typical input offset voltage, –40°C to 125°C operating temperature range, fail-safe inputs (no diodes to V+), and ability to drive up to 250pF capacitive loads without sustained oscillations.

Technical Context

The OPA4310IDR implements a unity-gain-stable, internally compensated CMOS op-amp architecture with integrated RFI/EMI filtering on input pins and no phase reversal under input overdrive. Its robust ESD structure (±8kV HBM) eliminates input-to-V+ diodes, supporting fail-safe operation in high-noise industrial environments.

Each of the four independent amplifiers features rail-to-rail input common-mode range extending 0.1V beyond rails and rail-to-rail output swing within 7mV of rails (at 5.5V, RL = 10kΩ), with thermal shutdown and internal current limiting ensuring safe operation during overload or parallel configuration.

Key Specifications

Pinout & Package

OPA4310IDR is packaged in a 14-pin SOIC (D package), 8.65mm × 6mm body with exposed pad option (not electrically connected in standard D variant). Pin 11 is V– (ground or negative supply), pin 4 is V+, and channels are arranged with dedicated IN+/IN–/OUT per amplifier.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad op-amp applications.

Compared with OPA4322IDR and LMV324DR, the OPA4310IDR uniquely combines high output current, fast shutdown, fail-safe inputs, and 250pF capacitive drive - making it the only option among the three qualified for optical module biasing and high-fidelity LED driver designs.

Availability

OPA4310IDR is available at Aetrix Electronics and suitable for optical transceiver design, industrial 4–20mA loop systems, and LED lighting control requiring stable component supply across extended temperature ranges and high-reliability production cycles.

Supply support for OPA4310IDR 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, and communications markets.

The OPAx310 family was designed specifically for high-current, low-voltage signal conditioning in optical interconnects, programmable current sources, and precision analog front-ends where rail-to-rail operation and EMI resilience are mandatory.

FAQ

What is the maximum capacitive load the OPA4310IDR can drive without oscillation?

The OPA4310IDR can drive up to 250pF of capacitive load without sustained oscillations under unity-gain conditions with a 10kΩ load to mid-supply. This capability eliminates the need for external isolation resistors in LCD column drivers or long-trace sensor interfaces. The OPA4310IDR achieves this via internal compensation and robust phase margin (>60°) across its operating voltage range.

Does the OPA4310IDR have built-in EMI filtering, and how does it affect system-level EMC?

Yes, the OPA4310IDR integrates RFI and EMI rejection filtering on all input pins, providing 75dB rejection at 1.8GHz. This reduces susceptibility to cellular and Wi-Fi interference in optical modules and industrial sensors, allowing designers to meet CISPR-22 Class B emissions without adding external RC filters or ferrite beads - simplifying layout and lowering BOM cost.

Can the OPA4310IDR operate from a single 1.8V supply, and what are the output swing limitations?

Yes, the OPA4310IDR operates from a single 1.8V supply (V+ = 1.8V, V– = GND). At 1.8V and RL = 10kΩ, its output swings within 2mV of GND and 11mV of V+, delivering >98% of rail-to-rail range. This enables accurate low-voltage sensor buffering and reference scaling in battery-powered IoT edge devices.

What is the thermal performance of the OPA4310IDR in SOIC (D) package at full output current?

In the 14-pin SOIC (D) package, the OPA4310IDR has a junction-to-ambient thermal resistance (RθJA) of 101.5°C/W. When sourcing ±150mA continuously at 5.5V, power dissipation per channel reaches ~170mW; with four channels active, total die temperature rise above ambient is ~69°C - remaining within the –40°C to 125°C operating range if ambient stays below 56°C.

How does the fail-safe input structure of the OPA4310IDR improve reliability in industrial applications?

The OPA4310IDR's fail-safe inputs omit diodes from IN+ and IN– to V+, preventing latch-up when input signals exceed V+ (e.g., during hot-plug events or sensor cable faults). This eliminates destructive current paths and enables reliable operation in noisy factory-floor environments where transient overvoltages up to 6V beyond V+ are possible - a feature absent in standard CMOS op-amps like LMV324.