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Home > Products > Integrated Circuits (ICs) > Linear > Instrumentation, Op Amps, Buffer Amps

Texas Instruments OPA2344UA

Name: OPA2344UA
Brand: Texas Instruments
SKU: OPA2344UA
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: OPA2344UA

Manufacturer:: Texas Instruments

Category:: Instrumentation, Op Amps, Buffer Amps

Package:: 8-SOIC (0.154", 3.90mm Width)

Datasheet:: OPA2344UA.pdf

Description:: IC CMOS 2 CIRCUIT 8SOIC

Quantity:: RFQ Add To RFQ list

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Product details

Overview

OPA2344UA from Texas Instruments is a dual, rail-to-rail input/output CMOS operational amplifier optimized for low-power, single-supply precision applications. It delivers 1 MHz gain-bandwidth, 0.8 V/µs slew rate, ±1 mV max input offset voltage, 150 µA typical quiescent current per amplifier, and operates from 2.7 V to 5.5 V - enabling high dynamic range signal conditioning in space-constrained data acquisition systems.

For engineers reviewing the OPA2344UA datasheet, OPA2344UA pinout, OPA2344UA application, or OPA2344UA equivalent, this page provides verified specifications, SOIC-8 package terminal mapping, real-world use cases in audio and sensor interfaces, and validated alternative options for design flexibility and supply continuity.

Technical Context

The OPA2344UA employs a complementary CMOS input stage enabling rail-to-rail input common-mode range extending 300 mV beyond both supply rails, with a 400 mV transition region where both N- and P-channel pairs are active. Its unity-gain stable architecture supports G = 1 configurations without external compensation.

It features a class AB rail-to-rail output stage capable of swinging within 1 mV of either rail under light loads (100 kΩ), maintaining ≥96 dB open-loop gain. Input bias current is ultra-low (±10 pA max), and THD+N is 0.006% at 1 kHz, making it suitable for high-fidelity analog front-ends driving SAR ADCs.

Key Specifications

Parameter	Value and Actual Design Meaning
Gain-Bandwidth Product	1 MHz - enables stable unity-gain buffering and low-frequency filtering up to ~100 kHz with <1 dB gain error.
Slew Rate	0.8 V/µs - supports 100 kHz full-scale sine output at 5 Vpp without distortion in G = 1 configuration.
Input Offset Voltage	±1 mV max - ensures ≤0.02% gain error in 50× instrumentation amplifier topologies at room temperature.
Quiescent Current	150 µA per amplifier typ - allows dual-channel operation at <300 µA total, ideal for battery-powered DAQ nodes.
Input Common-Mode Range	–0.3 V to (V+) + 0.3 V - permits direct interfacing with 0–5 V sensors and microcontroller ADC references without level-shifting.
Output Voltage Swing	Within 1 mV of rails (RL = 100 kΩ) - maximizes usable dynamic range in 3.3 V or 5 V single-supply systems.
THD + Noise	0.006% at 1 kHz - meets audio-grade signal integrity requirements for microphone preamplifiers and voice-band filters.

Pinout & Package

OPA2344UA is housed in an 8-pin SOIC (SO-8) package (Package Drawing D), RoHS-compliant, with moisture sensitivity level (MSL) 2–260°C–1 year. Thermal resistance θ_JA is 150°C/W.

Pin	Circuit Role	Design Meaning
1	Out A	Amplifier A output - drives ADC input or next-stage filter; rail-to-rail swing supports full-scale signal delivery.
2	–In A	Inverting input of Amp A - used in transimpedance or inverting gain configurations; high-impedance CMOS node.
3	+In A	Non-inverting input of Amp A - accepts rail-to-rail common-mode signals; critical for unity-gain buffer stability.
4	V–	Negative supply / ground reference - must be bypassed with 0.01 µF ceramic capacitor near pin for PSRR optimization.
5	Out B	Amplifier B output - independent channel for dual-path signal processing (e.g., differential driver or dual-sensor interface).
6	–In B	Inverting input of Amp B - electrically isolated from Amp A; enables simultaneous dual-channel closed-loop control.
7	+In B	Non-inverting input of Amp B - identical input characteristics to Pin 3; supports matched dual-channel gain stages.
8	V+	Positive supply - accepts 2.7 V to 5.5 V; internal ESD clamps require input signals to stay within (V–) –0.5 V to (V+) +0.5 V.

Key Features

Feature	Design Value
Rail-to-rail input	Common-mode range extends 300 mV beyond supplies - eliminates need for level-shifting when interfacing with 0–V_CC sensors or DAC outputs.
Rail-to-rail output	Swings within 1 mV of rails at light loads - preserves >99.9% of available voltage headroom in 3.3 V systems.
Low quiescent current	150 µA per amplifier typ - enables dual-channel operation below 300 µA, supporting >1-year battery life in portable DAQ devices.
Unity-gain stable	No external compensation required - simplifies layout and reduces BOM count in buffer and follower applications.
Ultra-low input bias current	±10 pA max - prevents significant DC error in high-impedance source applications (e.g., piezoelectric sensors, pH electrodes).
Low THD+N	0.006% at 1 kHz - maintains signal fidelity in audio preprocessing and communication channel conditioning.

Applications

PCMCIA Data Acquisition Card	Speech Bandpass Filter System
Use Scenario: Compact PCMCIA card acquires analog sensor data (e.g., temperature, pressure) using a 12-bit SAR ADC with switched-capacitor input. IC Role / Device Role / Timing Role: OPA2344UA buffers and conditions sensor signals while driving the ADC's dynamic input capacitance; dual channel enables simultaneous differential sensing. Use Value: Rail-to-rail I/O and 1 MHz GBW ensure full-scale signal capture without clipping or settling error; 150 µA per amp minimizes card-level power draw.	Use Scenario: Electret microphone signal is amplified and filtered (300 Hz–3 kHz) for voice recording in handheld devices operating from 2.7–5 V. IC Role / Device Role / Timing Role: One amplifier provides fixed-gain preamplification; the second implements bandpass filtering - both operate from same low-noise rail. Use Value: 0.006% THD+N preserves speech intelligibility; dual-channel integration reduces PCB area by 40% vs. discrete op-amp solutions.
Industrial Process Monitoring Node	Portable Test Equipment Front-End
Use Scenario: Battery-powered field transmitter conditions 4–20 mA loop signals and digitizes them via integrated ADC for wireless telemetry. IC Role / Device Role / Timing Role: OPA2344UA performs I/V conversion and anti-alias filtering; rail-to-rail input accommodates wide common-mode range of loop receivers. Use Value: ±1 mV offset and 150 µA IQ enable accurate 12-bit measurement with sub-0.1% system error and multi-year battery operation.	Use Scenario: Handheld multimeter or oscilloscope probe amplifier requires precision, low-noise gain with minimal power consumption. IC Role / Device Role / Timing Role: Dual amplifier configures as programmable gain stage and reference buffer - sharing supply and layout resources. Use Value: 10¹³ Ω input impedance and 30 nV/√Hz noise density preserve signal integrity; SOIC-8 footprint supports compact, serviceable design.

PCMCIA Data Acquisition Card

Speech Bandpass Filter System

Use Scenario: Compact PCMCIA card acquires analog sensor data (e.g., temperature, pressure) using a 12-bit SAR ADC with switched-capacitor input.

IC Role / Device Role / Timing Role: OPA2344UA buffers and conditions sensor signals while driving the ADC's dynamic input capacitance; dual channel enables simultaneous differential sensing.

Use Value: Rail-to-rail I/O and 1 MHz GBW ensure full-scale signal capture without clipping or settling error; 150 µA per amp minimizes card-level power draw.

Use Scenario: Electret microphone signal is amplified and filtered (300 Hz–3 kHz) for voice recording in handheld devices operating from 2.7–5 V.

IC Role / Device Role / Timing Role: One amplifier provides fixed-gain preamplification; the second implements bandpass filtering - both operate from same low-noise rail.

Use Value: 0.006% THD+N preserves speech intelligibility; dual-channel integration reduces PCB area by 40% vs. discrete op-amp solutions.

Industrial Process Monitoring Node

Portable Test Equipment Front-End

Use Scenario: Battery-powered field transmitter conditions 4–20 mA loop signals and digitizes them via integrated ADC for wireless telemetry.

IC Role / Device Role / Timing Role: OPA2344UA performs I/V conversion and anti-alias filtering; rail-to-rail input accommodates wide common-mode range of loop receivers.

Use Value: ±1 mV offset and 150 µA IQ enable accurate 12-bit measurement with sub-0.1% system error and multi-year battery operation.

Use Scenario: Handheld multimeter or oscilloscope probe amplifier requires precision, low-noise gain with minimal power consumption.

IC Role / Device Role / Timing Role: Dual amplifier configures as programmable gain stage and reference buffer - sharing supply and layout resources.

Use Value: 10¹³ Ω input impedance and 30 nV/√Hz noise density preserve signal integrity; SOIC-8 footprint supports compact, serviceable design.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
OPA2343UA	Lower quiescent current (85 µA typ), reduced GBW (0.55 MHz), same SOIC-8 package and pinout.	Better suited for ultra-low-power (<200 µA total) applications where bandwidth ≤50 kHz is sufficient.	Select OPA2343UA when battery life is prioritized over speed; verify stability with capacitive loads due to lower phase margin.
MCP6022-I/SN	Higher GBW (10 MHz), higher IQ (1 mA typ), same SOIC-8 pinout but different input offset (2.5 mV max) and no guaranteed rail-to-rail input.	Preferred for higher-speed signal chains (e.g., active filters above 100 kHz) where power budget allows.	Choose MCP6022-I/SN only if bandwidth >1 MHz is required and supply current >1 mA is acceptable; confirm input common-mode range compatibility.

Compared with OPA2344UA, OPA2343UA offers deeper power savings at reduced speed, while MCP6022-I/SN trades 6.7× higher current for 10× bandwidth - making OPA2344UA the optimal balance for precision, low-power, dual-channel signal conditioning in 2.7–5.5 V systems.

Availability

OPA2344UA is available at Aetrix Electronics and suitable for PCMCIA cards, speech processing systems, industrial process monitors, and portable test equipment requiring stable component supply across extended temperature ranges (–40°C to +85°C) and long production lifecycles.

Supply support for OPA2344UA 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 chain solutions.

The OPA2344UA belongs to TI's MicroAmplifier™ series, designed specifically for miniature, battery-operated, single-supply applications demanding rail-to-rail performance, low IQ, and high accuracy - including portable instrumentation and sensor interfaces.

FAQ

What is the maximum operating supply voltage for the OPA2344UA?

The OPA2344UA has an absolute maximum supply voltage of 7.5 V between V+ and V– pins. However, its specified operating range is 2.7 V to 5.5 V. Operating outside this range may cause parametric degradation or reliability issues. The device is fully characterized and guaranteed across –40°C to +85°C only within the 2.7–5.5 V window, and all published specs (e.g., GBW, IQ, offset) apply strictly within this range. Always observe the 0.5 V input voltage limit beyond rails.

Is the OPA2344UA unity-gain stable?

Yes, the OPA2344UA is explicitly unity-gain stable, as confirmed in the official TI SBOS107A datasheet. It requires no external compensation for G = 1 configurations, including voltage followers and non-inverting buffers. This stability is achieved through internal frequency compensation optimized for the OPA344/2344/4344 family. The OPA2344UA maintains phase margin >60° at unity gain, enabling robust performance with capacitive loads up to 250 pF when combined with proper PCB layout and supply decoupling.

Does the OPA2344UA support rail-to-rail input and output simultaneously?

Yes, the OPA2344UA supports true rail-to-rail input and output operation. Its input common-mode voltage range extends from (V–) –0.3 V to (V+) + 0.3 V, and its output can swing within 1 mV of either rail under light loads (100 kΩ). This dual rail-to-rail capability allows full utilization of the supply range in single-supply systems - for example, accepting a 0–5 V sensor signal and delivering a clean 0–5 V output to an ADC without level-shifting circuitry. Performance remains specified across –40°C to +85°C.

What is the thermal resistance (θ_JA) of the OPA2344UA in SOIC-8 package?

The OPA2344UA in SOIC-8 (Package Drawing D) has a junction-to-ambient thermal resistance (θ_JA) of 150°C/W, as documented in the TI SBOS107A datasheet. This value assumes standard JEDEC 2-layer board conditions. With a maximum junction temperature of 150°C and ambient temperature up to +85°C, the device can dissipate up to 433 mW continuously (ΔT/θ_JA). At typical operation (5.5 V, 300 µA total IQ), power dissipation is ~1.65 mW - well within safe limits even in enclosed environments.

Can the OPA2344UA drive ADC inputs directly?

Yes, the OPA2344UA is specifically optimized for driving sampling ADC inputs, as highlighted in TI's Applications Information section. Its rail-to-rail output, low output impedance, and fast settling time (5 µs to 0.1%) allow it to settle a 2 V step into the ADC's dynamic input capacitance without introducing acquisition errors. Figure 6 and Figure 7 in the SBOS107A datasheet demonstrate direct interfacing with the ADS7822 12-bit SAR ADC - confirming reliable performance in real-world data acquisition systems using the OPA2344UA.

OPA2344UA Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: MicroAmplifier™

Package/Case:: 8-SOIC (0.154", 3.90mm Width)

Packaging:: Tube

Product Status:: Active

Amplifier Type:: CMOS

Number of Circuits:: 2

Output Type:: Rail-to-Rail

Slew Rate:: 0.8V/µs

Gain Bandwidth Product:: 1 MHz

-3db Bandwidth:: -

Current - Input Bias:: 0.2 pA

Voltage - Input Offset:: 200 µV

Current - Supply:: 150µA (x2 Channels)

Current - Output / Channel:: 15 mA

Voltage - Supply Span (Min):: 2.5 V

Voltage - Supply Span (Max):: 5.5 V

Operating Temperature:: -40°C ~ 85°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 8-SOIC

OPA2344UA FAQ

1.How can I place an order for OPA2344UA through Aetrix?

Please submit a Request for Quotation (RFQ) for OPA2344UA on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for OPA2344UA reliable?

The price and inventory of OPA2344UA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA2344UA is usually 5 days.

3.What payment methods are accepted for OPA2344UA?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA2344UA transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for OPA2344UA?

OPA2344UA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your OPA2344UA order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for OPA2344UA?

For technical support, including OPA2344UA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA2344UA requirements.

6.How does Aetrix verify that OPA2344UA is sourced from the original manufacturer or authorized distributors?

All OPA2344UA products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that OPA2344UA meets industry standards.

7.What is the process for return or replacement of OPA2344UA?

All OPA2344UA units undergo pre-shipment inspection (PSI). If there is an issue with OPA2344UA, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The OPA2344UA part is unused and in its original packaging.

Return procedure for OPA2344UA:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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