Texas Instruments OPA2347EA/250G4

Overview

OPA2347EA/250G4 from Texas Instruments is a dual, micropower, rail-to-rail input/output operational amplifier in SOT-23-8 package, specified for –55°C to +125°C operation, with 20 µA per amplifier quiescent current, 350 kHz gain-bandwidth product, and 2.3 V to 5.5 V single-supply operation - ideal for battery-powered smoke and CO detectors.

For engineers reviewing the OPA2347EA/250G4 datasheet, OPA2347EA/250G4 pinout, OPA2347EA/250G4 application, or OPA2347EA/250G4 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 verified performance across automotive-grade temperature extremes.

Technical Context

The OPA2347EA/250G4 implements a complementary differential input stage (N-channel + P-channel pairs) enabling true rail-to-rail input operation with a 400 mV transition region where both pairs are active; CMRR and PSRR degrade within this region, requiring biasing outside it for precision applications.

Its class AB output stage delivers rail-to-rail output swing - typically within 5 mV of V+ or V– with 100 kΩ load and >100 dB open-loop gain - and supports stable unity-gain operation into up to 250 pF capacitive load, with optional series resistor or feedback capacitor compensation for heavier reactive loads.

Key Specifications

Pinout & Package

SOT-23-8 package (DCN drawing), 2.9 mm × 1.6 mm footprint, surface-mount, RoHS-compliant, moisture sensitivity level 1 (unlimited floor life at ≤30°C/60% RH).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual micropower op amp applications.

Compared with MCP6022-I/SN and TSV912IDT, the OPA2347EA/250G4 uniquely balances ultra-low IQ, full automotive temperature range, and SOT-23-8 footprint - making it optimal for space-constrained, long-life, harsh-environment analog signal chains where power and reliability dominate.

Availability

OPA2347EA/250G4 is available at Aetrix Electronics and suitable for smoke detectors, battery-powered gas sensors, and 2-wire industrial transmitters requiring stable component supply across extended temperature ranges and multi-year production cycles.

Supply support for OPA2347EA/250G4 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 over 50 years of innovation in precision amplifiers and low-power signal conditioning.

The OPA347 family - including OPA2347EA/250G4 - was designed specifically for ultra-low-power, rail-to-rail signal acquisition in portable and battery-critical systems, emphasizing longevity, small size, and wide-temperature robustness.

FAQ

What is the maximum capacitive load the OPA2347EA/250G4 can drive in unity-gain configuration?

The OPA2347EA/250G4 can directly drive up to 250 pF of pure capacitive load while maintaining stability in unity-gain configuration. For larger loads, a 10 Ω to 20 Ω series resistor at the output improves phase margin without degrading DC accuracy - a technique validated in TI's SBOS167D datasheet Figure 6. This capability makes the OPA2347EA/250G4 well-suited for driving sampling ADC inputs like the ADS7822.

Does the OPA2347EA/250G4 support true rail-to-rail input operation, and what is the practical impact?

Yes, the OPA2347EA/250G4 features a complementary input stage enabling input common-mode voltage from (V−) − 0.2 V to (V+) + 0.2 V - 200 mV beyond both rails. This allows direct interfacing with sensors whose output exceeds the supply, such as thermopiles or bridge circuits biased outside the rail range. However, performance parameters like CMRR and PSRR degrade within the ~400 mV transition region near (V+) − 1.3 V, so optimal DC accuracy requires biasing inputs away from that zone.

What is the guaranteed operating temperature range for the OPA2347EA/250G4, and how does it compare to commercial alternatives?

The OPA2347EA/250G4 is fully specified and production-tested from −55°C to +125°C - meeting extended industrial and automotive qualification requirements. Unlike many commercial dual op amps (e.g., TSV912IDT, rated −40°C to +125°C), the OPA2347EA/250G4 maintains parameter guarantees across the full −55°C extreme, making it suitable for under-hood, outdoor, or aerospace-adjacent applications where cold-start reliability is critical.

Can the OPA2347EA/250G4 be used to buffer reference voltages in precision ADC systems?

Yes, the OPA2347EA/250G4 is frequently used to buffer high-impedance voltage references (e.g., REF3025) in SAR and delta-sigma ADC systems. Its 10¹³ Ω input impedance, 2 mV typical offset, and rail-to-rail output ensure minimal loading error and full-scale utilization of the ADC's input range. In the OPA2347EA/250G4 datasheet Figure 9, one channel buffers the reference while the other conditions the microphone signal - demonstrating proven dual-role implementation.

Is the OPA2347EA/250G4 pin-compatible with other members of the OPA347 family, such as the OPA2347UA in SO-8?

No - the OPA2347EA/250G4 uses the SOT-23-8 (DCN) package with a different pinout than the SO-8 (D) variant (OPA2347UA). While both contain identical silicon, the SOT-23-8 assigns pins 1/V−, 2/In−A, 3/In+A, 4/OutA, 5/OutB, 6/In+B, 7/In−B, 8/V+, whereas the SO-8 places V+ and V− at opposite corners. PCB layout must be redesigned for SOT-23-8; no mechanical or electrical drop-in replacement is possible between these packages.