Texas Instruments OPA2342UA

Overview

OPA2342UA from Texas Instruments is a dual, rail-to-rail input/output CMOS operational amplifier optimized for low-cost, low-power, single-supply operation down to 2.7V. It delivers 1MHz gain-bandwidth, 1V/µs slew rate, and 150µA typical quiescent current per channel, with output swing within 1mV of rails under light load - ideal for driving sampling ADCs in portable data acquisition systems.

For engineers reviewing the OPA2342UA datasheet, OPA2342UA pinout, OPA2342UA application, or OPA2342UA equivalent, key selection criteria include its rail-to-rail I/O capability at 2.7–5.5V supply, ±6mV max input offset voltage, 0.006% THD+N at 1kHz, 30nV/√Hz input voltage noise density, and SO-8 package compatibility with standard PCB layouts for dual op-amp signal conditioning.

Technical Context

The OPA2342UA employs complementary N-channel and P-channel input differential pairs to achieve rail-to-rail input common-mode range extending 300mV beyond both supply rails. Its class AB output stage enables rail-to-rail output swing, maintaining ≥96dB open-loop gain into 100kΩ loads.

It is unity-gain stable and specified across –40°C to +85°C, with PSRR >250µV/V and CMRR ≥74dB over full temperature range at 5.5V supply. Input bias current remains ultra-low (±10pA max), enabling high-impedance sensor interfacing without significant error.

Key Specifications

Pinout & Package

OPA2342UA is housed in an 8-pin SOIC (SO-8) surface-mount package (Package Drawing D), with thermal resistance θ_JA = 150°C/W. Pin assignments are fully compatible with industry-standard dual op-amp footprints.

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 OPA2342UA uniquely balances 1MHz bandwidth, 150µA quiescent current, and rail-to-rail I/O in a cost-optimized SO-8 package - making it optimal for portable data loggers and consumer audio where power, precision, and footprint are co-constrained.

Availability

OPA2342UA is available at Aetrix Electronics and suitable for audio processing, data acquisition, active filtering, and process control applications requiring stable component supply, long-term manufacturability, and RoHS-compliant sourcing.

Supply support for OPA2342UA 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 op-amp design heritage and broad manufacturing scale.

The OPA2342UA belongs to TI's MicroAmplifier™ series - engineered specifically for low-cost, low-power, miniature applications demanding rail-to-rail performance on single supplies as low as 2.7V.

FAQ

What is the maximum operating supply voltage for the OPA2342UA?

The OPA2342UA has an absolute maximum supply voltage rating of 7.5V between V+ and V– pins. However, its specified operating range is 2.7V to 5.5V - performance parameters including gain-bandwidth, offset voltage, and quiescent current are guaranteed only within this range. Exceeding 5.5V may cause parametric shift or reliability risk.

Does the OPA2342UA support true rail-to-rail input at 2.7V supply?

Yes - the OPA2342UA's input common-mode voltage range extends 300mV beyond both supply rails across its full 2.7V–5.5V operating range. At 2.7V supply, inputs can swing from –0.3V to +3.0V, enabling direct connection to 0–2.7V DAC outputs or grounded-sensor bridges without level-shifting circuitry.

Can the OPA2342UA drive a 1000pF capacitive load in unity-gain configuration?

No - the OPA2342UA is specified to directly drive up to 250pF in unity-gain configuration. Driving 1000pF will cause instability and ringing. To stabilize larger capacitive loads, insert a 10Ω–20Ω series resistor between the OPA2342UA output and the load capacitance, as documented in TI's SBOS106A datasheet Figure 5.

What is the typical input bias current of the OPA2342UA at +85°C?

The OPA2342UA exhibits ultra-low input bias current: ±0.2pA typical at +25°C, rising to ≤±10pA maximum across –40°C to +85°C. This is confirmed in the "INPUT BIAS CURRENT vs TEMPERATURE" curve on page 5 of SBOS106A - ensuring negligible voltage error even with MΩ-level source impedances at elevated temperatures.

Is the OPA2342UA pin-compatible with other dual op-amps in SO-8 packages like the LM358?

No - the OPA2342UA uses standard dual op-amp SO-8 pinout (V+, Out B, –In B, +In B, +In A, –In A, Out A, V–), which differs from LM358 (V–, Out A, –In A, +In A, +In B, –In B, Out B, V+). Direct replacement would require PCB layout revision. Always verify pin mapping using the "PIN CONFIGURATIONS" diagram on page 3 of SBOS106A before substitution.