Texas Instruments OPA2347UA

Overview

OPA2347UA from Texas Instruments is a dual, microPower, rail-to-rail input and output operational amplifier in SOIC-8 package, specified for operation from –55°C to +125°C, with 20 µA quiescent current per channel, 350 kHz gain-bandwidth product, and 2.3 V to 5.5 V single-supply operation - ideal for battery-powered smoke detectors and portable instrumentation.

For engineers reviewing the OPA2347UA datasheet, OPA2347UA pinout, OPA2347UA application, or OPA2347UA equivalent, key selection criteria include ultra-low IQ, rail-to-rail I/O swing within 5 mV of rails at light loads, input common-mode range extending 200 mV beyond supply rails, and guaranteed performance across industrial temperature extremes.

Technical Context

The OPA2347UA employs complementary N-channel and P-channel input differential pairs to achieve rail-to-rail input operation, with a 400 mV transition region where both stages are active - causing potential degradation in PSRR, CMRR, and offset drift. Its class AB output stage delivers rail-to-rail output swing, maintaining >100 dB open-loop gain into 100 kΩ loads.

It is unity-gain stable and optimized for driving medium-speed SAR ADCs like the ADS7822, supporting low-noise signal conditioning in 2-wire transmitters and electret microphone front-ends with <250 µA total system quiescent current at 2.7–5 V supply.

Key Specifications

Pinout & Package

OPA2347UA is housed in an 8-pin SOIC (Small Outline Integrated Circuit) package with standard JEDEC MS-012AC footprint, 1.27 mm pitch, and RoHS-compliant NiPdAu lead finish (Level-2 moisture sensitivity).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP6022-I/SN and TLV2462IDR, the OPA2347UA uniquely balances ultra-low quiescent current (20 µA), full industrial temperature qualification (–55°C to +125°C), and rail-to-rail I/O in a dual SOIC-8 - making it irreplaceable for long-life, wide-temperature, battery-constrained sensing applications.

Availability

OPA2347UA is available at Aetrix Electronics and suitable for portable instrumentation, battery-powered gas detection, and 2-wire transmitter designs requiring stable component supply across extended temperature ranges and multi-year production cycles.

Supply support for OPA2347UA 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 low-power signal conditioning.

The OPA2347UA belongs to TI's OPA347 family of microPower rail-to-rail op-amps, designed specifically for space- and energy-constrained applications including portable medical devices, environmental sensors, and industrial safety systems.

FAQ

What is the maximum operating supply voltage for the OPA2347UA?

The OPA2347UA has an absolute maximum supply voltage of 7.5 V between V+ and V− pins. However, its specified operating range is 2.3 V to 5.5 V. Operation above 5.5 V voids parametric guarantees and risks reliability degradation. The OPA2347UA datasheet explicitly defines electrical characteristics only within the 2.3–5.5 V range, and all thermal and lifetime ratings assume compliance with this limit.

Does the OPA2347UA support true rail-to-rail input beyond the supply rails?

Yes - the OPA2347UA's input common-mode voltage range extends from (V−) − 0.2 V to (V+) + 0.2 V, enabling inputs 200 mV beyond both rails. This is achieved via complementary N- and P-channel input stages. However, operation in the 400 mV transition region (typically ~1.3 V below V+) may degrade PSRR, CMRR, and offset drift; the OPA2347UA datasheet recommends avoiding this region for precision applications.

Can the OPA2347UA drive a 100 kΩ load to within 5 mV of the supply rails?

Yes - the OPA2347UA delivers rail-to-rail output swing within 5 mV of V+ or V− when sourcing/sinking ≤100 µA into a 100 kΩ load referenced to VS/2. This specification is verified at TA = +25°C with AOL > 100 dB and is maintained across the full –55°C to +125°C temperature range per the OPA2347UA datasheet's "Output Voltage Swing from Rail" table.

Is the OPA2347UA pin-compatible with other dual op-amps in SOIC-8 packages?

No - the OPA2347UA uses a non-standard SOIC-8 pinout: Pin 1 = Out A, Pin 2 = −In A, Pin 3 = +In A, Pin 4 = V−, Pin 5 = +In B, Pin 6 = −In B, Pin 7 = Out B, Pin 8 = V+. This differs from industry-standard dual op-amps (e.g., LM358, TL072) where Pin 1 is often NC or offset null. Substituting the OPA2347UA requires PCB layout revision to match its unique pin mapping.

What is the photosensitivity concern associated with OPA2347UA variants?

The OPA2347UA itself (SOIC-8) is not photosensitive - that concern applies only to the WCSP-8 variants (OPA2347YED/YZDR), which lack molding compound and expose the die surface. Ambient light can increase input bias current up to 100 pA in those packages. The OPA2347UA uses standard plastic encapsulation and exhibits no measurable photosensitivity; its input bias current remains ±0.5 pA typical across its full temperature range.