Texas Instruments OPA2314AIDR

Overview

OPA2314AIDR from Texas Instruments is a dual-channel, rail-to-rail input/output CMOS operational amplifier optimized for low-voltage, low-power applications. It delivers 3 MHz gain-bandwidth, 1.5 V/µs slew rate, and 14 nV/√Hz input voltage noise at 1 kHz - all while consuming only 150 µA per channel at 5 V. It operates from 1.8 V to 5.5 V and supports precision signal conditioning in battery-powered instrumentation and photodiode amplifiers.

For engineers reviewing the OPA2314AIDR datasheet, OPA2314AIDR pinout, OPA2314AIDR application, or OPA2314AIDR equivalent, key selection criteria include its 0.5 mV typical input offset voltage, 0.2 pA input bias current, integrated RF/EMI filter, unity-gain stability with up to 300 pF capacitive load, and extended –40°C to +125°C temperature range.

Technical Context

The OPA2314AIDR employs a complementary differential input stage enabling rail-to-rail common-mode input range (extending 200 mV beyond both supply rails), paired with a Class AB output stage capable of driving ≥10 kΩ loads across the full supply range. Its internal architecture includes an integrated RF/EMI rejection filter and robust electrostatic discharge protection (4-kV HBM).

It achieves unity-gain stability without external compensation, supports single-supply operation down to 1.8 V (±0.9 V), and maintains DC precision via low offset drift (1 µV/°C) and high open-loop gain (≥100 dB at 5.5 V). No phase reversal occurs under overdrive conditions.

Key Specifications

Pinout & Package

OPA2314AIDR is housed in an SOIC-8 (D) package measuring 4.90 mm × 3.91 mm, with exposed pad not present. Thermal resistance R_θJA is 138.4°C/W.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual low-power op-amp applications.

Compared with MCP6022-I/SN and AD8602ARZ, the OPA2314AIDR uniquely balances ultra-low power (150 µA), rail-to-rail input capability, and integrated EMI filtering - making it optimal for space-constrained, battery-operated, and electrically noisy embedded systems requiring precision at minimal current draw.

Availability

OPA2314AIDR is available at Aetrix Electronics and suitable for battery-powered instruments, photodiode amplifiers, and active filters requiring stable component supply across industrial temperature ranges and long production lifecycles.

Supply support for OPA2314AIDR 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 delivering analog and embedded processing solutions, with deep expertise in precision amplifiers and low-power design.

The OPA314 family - including OPA2314AIDR - was engineered specifically for cost-sensitive, battery-powered applications demanding rail-to-rail operation, low IQ, and robust EMC performance without sacrificing DC accuracy.

FAQ

What is the maximum capacitive load the OPA2314AIDR can drive while remaining stable?

The OPA2314AIDR is unity-gain stable with capacitive loads up to 300 pF, as confirmed in the datasheet's Small-Signal Overshoot vs Load Capacitance plot (Figure 20) and Functional Block Diagram section. This eliminates the need for external isolation resistors in most sensor interface and ADC driver applications, simplifying PCB layout and reducing component count. Stability holds across the full –40°C to +125°C temperature range and 1.8 V to 5.5 V supply.

Does the OPA2314AIDR support true rail-to-rail input operation?

Yes, the OPA2314AIDR supports rail-to-rail input with a common-mode voltage range extending 200 mV beyond both V– and V+ rails - verified in Electrical Characteristics (V_CM range specification) and Feature Description (Section 7.3.2). This allows direct interfacing with sensors whose output swings near ground or supply, critical for single-supply systems like portable medical devices. The complementary N/P-channel input stage ensures consistent bias current and offset behavior across the full range.

What is the typical input offset voltage drift of the OPA2314AIDR over temperature?

The OPA2314AIDR exhibits a typical input offset voltage drift of 1 µV/°C, as specified in the Electrical Characteristics table under "dV_OS/dT vs Temperature." This low drift ensures minimal calibration drift in precision measurement systems operating across –40°C to +125°C. Measured offset voltage remains within ±2.5 mV over the full temperature range, supporting high-accuracy applications such as strain gauge amplification and thermocouple conditioning without frequent recalibration.

Can the OPA2314AIDR be used in photodiode transimpedance amplifier (TIA) circuits?

Yes, the OPA2314AIDR is well-suited for photodiode TIA applications due to its 0.2 pA typical input bias current, 14 nV/√Hz input voltage noise at 1 kHz, and rail-to-rail output swing. Its low input capacitance (1 pF differential) minimizes noise gain peaking, and unity-gain stability allows direct connection to high-value feedback resistors (e.g., 1–100 MΩ) without compensation. The integrated RF/EMI filter further suppresses ambient noise that commonly corrupts low-level photocurrent measurements.

Is the OPA2314AIDR pin-compatible with other dual op-amps in SOIC-8 packages?

No, the OPA2314AIDR uses a standard dual op-amp pinout (V–, OUT A, –IN A, +IN A, +IN B, –IN B, OUT B, V+) defined in TI's datasheet Pin Functions table - which matches industry-standard SOIC-8 dual op-amp layouts (e.g., LM358, TL072). However, electrical characteristics (IQ, noise, offset, EMI filtering) differ significantly; direct substitution requires validation of quiescent current, noise, and stability margins in the target circuit. Always verify layout compatibility and performance against the specific design requirements before replacement.