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Texas Instruments OPA344PA
- Part No.:
- OPA344PA
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
OPA344PA.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:736
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Product details
Overview
OPA344PA from Texas Instruments is a single, rail-to-rail input/output CMOS operational amplifier optimized for unity-gain stability, low-power (150 µA typ), and precision operation on 2.7V–5.5V single supplies. It delivers 1 MHz gain-bandwidth, 0.8 V/µs slew rate, and 0.006% THD+N at 1 kHz - ideal for driving sampling ADCs like ADS7822 in portable data acquisition systems.
For engineers reviewing the OPA344PA datasheet, OPA344PA pinout, OPA344PA application, or OPA344PA equivalent, key selection considerations include its rail-to-rail input common-mode range extending 300 mV beyond rails, output swing within 1 mV of supply rails (RL = 100 kΩ), ±1 mV max input offset voltage, and compatibility with space-constrained industrial and audio signal conditioning designs.
Technical Context
The OPA344PA employs a complementary differential input stage (N- and P-channel pairs) enabling rail-to-rail input operation with a 400 mV transition region where both pairs are active - requiring careful biasing to avoid discontinuities in PSRR, CMRR, and THD. Its class AB output stage supports rail-to-rail output swing down to 1 mV from rails under light loads.
Designed for unity-gain stability, it features a 1 MHz gain-bandwidth product and 0.8 V/µs slew rate, with quiescent current tightly specified at 150 µA (typ) and 250 µA (max) across –40°C to +85°C - making it suitable for battery-powered micro-power applications without sacrificing precision.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-Bandwidth Product | 1 MHz - ensures stable unity-gain operation with adequate phase margin for sensor buffering and filter stages. |
| Slew Rate | 0.8 V/µs - supports clean 1 kHz sine-wave amplification with ≤0.006% THD+N and enables fast settling (5 µs to 0.1%) in data acquisition front-ends. |
| Input Offset Voltage | ±1 mV max - minimizes DC error in precision I/V conversion and low-level signal conditioning (e.g., electret microphone preamps). |
| Rail-to-Rail Output Swing | Within 1 mV of rails (RL = 100 kΩ) - maximizes dynamic range in 3.3V or 5V single-supply systems, critical for ADC driver headroom. |
| Quiescent Current | 150 µA typ / 250 µA max - enables multi-day battery life in portable instrumentation while maintaining 122 dB open-loop gain (AOL). |
| Common-Mode Input Range | –0.3 V to (V+) + 0.3 V - allows direct interfacing with signals near ground or V+ in single-supply configurations without level-shifting. |
| THD + Noise | 0.006% at 1 kHz - meets fidelity requirements for audio processing and high-resolution (12-bit) ADC driving applications. |
Pinout & Package
OPA344PA is housed in an 8-pin plastic dual in-line package (PDIP), through-hole mountable, with industry-standard pinout compatible with legacy op amp footprints. Thermal resistance θJA is 100°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | NC | No connect - unused terminal; must remain unconnected per datasheet. |
| 2 | –In | Inverting input - accepts feedback network for closed-loop gain configuration; high-impedance CMOS node (1013 Ω). |
| 3 | +In | Non-inverting input - reference point for buffer or non-inverting amplifier; rail-to-rail common-mode range support enables full-supply signal handling. |
| 4 | V– | Negative supply - connected to ground in single-supply operation; input clamped to –0.5 V minimum. |
| 5 | Out | Amplifier output - rail-to-rail capable, drives 600 Ω loads, swings within 1 mV of rails at light loads. |
| 6 | NC | No connect - unused terminal; must remain unconnected per datasheet. |
| 7 | NC | No connect - unused terminal; must remain unconnected per datasheet. |
| 8 | V+ | Positive supply - operates from 2.7 V to 5.5 V; bypass with 0.01 µF ceramic capacitor recommended. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input | Extends 300 mV beyond supply rails - eliminates need for level-shifting in single-supply sensor interfaces and microphone preamps. |
| Rail-to-rail output | Swings within 1 mV of V+ and V– (RL = 100 kΩ) - preserves maximum ADC input range and improves SNR in low-voltage systems. |
| Unity-gain stable | Guaranteed stable at G = 1 - simplifies design of buffers, active filters, and I/V converters without external compensation. |
| Low quiescent current | 150 µA typical - enables >1-year battery life in always-on portable test equipment and remote monitoring nodes. |
| High open-loop gain | 122 dB (typ) - ensures <0.01% gain error in precision gain stages with 100 kΩ feedback resistors. |
Applications
| PCMCIA Card Signal Conditioning | Data Acquisition Front-End |
|---|---|
Use Scenario: Amplifying and filtering analog sensor outputs (e.g., thermocouple, strain gauge) on compact PCMCIA cards for laptop-based measurement. IC Role / Device Role / Timing Role: Precision unity-gain buffer and anti-aliasing filter driver with rail-to-rail swing to maximize 12-bit ADC utilization. Use Value: Enables full-scale input range capture at 3.3V supply while consuming only 150 µA - extending card battery life without sacrificing resolution. | Use Scenario: Driving the input of ADS7822 12-bit sampling ADC in handheld test meters and environmental monitors. IC Role / Device Role / Timing Role: Charge-injection compensating buffer with 5 µs 0.1% settling time - synchronizes cleanly with ADC sample clock. Use Value: Eliminates external RC snubbing networks due to inherent capacitive load drive capability up to 250 pF at unity gain. |
| Audio Processing Preamp | Process Control Loop Amplifier |
Use Scenario: Electret microphone preamplifier in voice-recording modules operating from 2.7V–5V batteries. IC Role / Device Role / Timing Role: Low-noise (30 nV/√Hz), low-THD+N (0.006%) gain stage with rail-to-rail output for line-level signal generation. Use Value: Delivers full 3Vp-p output swing into 10 kΩ load without clipping - preserving speech band fidelity (300 Hz–3 kHz). | Use Scenario: Transducer signal conditioning in 4–20 mA loop-powered industrial sensors with tight power budgets. IC Role / Device Role / Timing Role: Precision I/V converter and offset-adjustable amplifier with ±1 mV max VOS for <0.1% span error. Use Value: Maintains accuracy over –40°C to +85°C with only ±3 µV/°C drift - reducing calibration frequency in field-deployed units. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA344UA | Same electrical specs; SOIC-8 package instead of PDIP - surface-mount, smaller footprint, higher thermal resistance (150°C/W vs 100°C/W). | Preferred for automated PCB assembly and space-constrained boards; not suitable for hand-soldered prototyping or breadboarding. | Select OPA344UA when volume production, reflow compatibility, or board density are priorities over manual assembly flexibility. |
| MCP6001T-I/OT | Lower GBW (1 MHz same), but higher input bias current (1 pA vs 0.2 pA typ), wider supply range (1.8–6.0 V), and lower quiescent current (9 µA vs 150 µA). | Better for ultra-low-power (<10 µA) applications; less suitable for precision DC-coupled signal chains requiring sub-mV offset and low drift. | Select MCP6001T-I/OT only when micro-power dominates over DC precision - e.g., wake-up sensor amplifiers, not main signal path. |
Compared with OPA344UA and MCP6001T-I/OT, the OPA344PA offers through-hole PDIP compatibility for rapid prototyping and legacy system upgrades, maintains superior DC precision (±1 mV VOS, ±3 µV/°C drift), and delivers proven rail-to-rail performance in single-supply industrial and audio signal paths where layout flexibility and testability are critical.
Availability
OPA344PA is available at Aetrix Electronics and suitable for PCMCIA card design, portable data acquisition systems, and industrial process control instrumentation requiring stable component supply, long-term lifecycle support, and RoHS-compliant through-hole op amps.
Supply support for OPA344PA 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 company specializing in analog and embedded processing technologies, with leadership in precision amplifiers, data converters, and power management ICs.
The OPA344PA belongs to TI's MicroAmplifier™ series - designed specifically for low-power, miniature, rail-to-rail op amp applications in portable instrumentation, sensor interfaces, and battery-operated signal conditioning systems.
FAQ
What is the maximum supply voltage rating for the OPA344PA?
The OPA344PA has an absolute maximum supply voltage rating of 7.5 V across V+ to V–. However, its specified operating range is 2.7 V to 5.5 V. Operating outside this range may cause parametric degradation or permanent damage. The device is fully characterized and guaranteed over the 2.7–5.5 V range at temperatures from –40°C to +85°C, and the OPA344PA datasheet confirms that all key specifications - including gain-bandwidth, offset voltage, and quiescent current - apply within this window.
Does the OPA344PA require external compensation for unity-gain stability?
No, the OPA344PA is internally compensated and unity-gain stable by design. The datasheet explicitly states "OPA344 series op amps are unity gain stable" and provides no recommendation for external compensation components. This allows direct use in buffer, follower, and non-inverting amplifier configurations without risk of oscillation - a key advantage over the OPA345, which requires G ≥ 5 for stability. The OPA344PA's 1 MHz gain-bandwidth and phase margin are validated across temperature and supply conditions.
Can the OPA344PA drive capacitive loads, and what is the limit?
Yes, the OPA344PA can directly drive up to 250 pF of pure capacitive load in unity-gain configuration while maintaining stability. This capability is confirmed in the Applications Information section of the OPA344PA datasheet. For loads exceeding 250 pF, a small series resistor (10–20 Ω) between the output and capacitive load is recommended to suppress ringing - though this introduces a minor DC error if a parallel resistive load exists. The OPA344PA's ability to drive such loads simplifies anti-aliasing filter design in ADC interface circuits.
What is the input common-mode voltage range of the OPA344PA, and why does it matter?
The OPA344PA features a rail-to-rail input common-mode voltage range from –0.3 V to (V+) + 0.3 V - meaning it accepts signals 300 mV below ground or above V+ in single-supply operation. This is enabled by its complementary N/P-channel input stage. It matters because it eliminates the need for input biasing networks in low-voltage systems (e.g., 3.3 V), allowing direct connection of sensors, microphones, or DAC outputs without level-shifting - preserving signal integrity and reducing component count in the OPA344PA signal path.
Is the OPA344PA suitable for audio applications, and what performance metrics support that?
Yes, the OPA344PA is suitable for audio applications, particularly low-power preamplification and line-driving. Key supporting metrics include 0.006% THD+N at 1 kHz, 30 nV/√Hz input voltage noise density, rail-to-rail output swing (enabling full 3 Vp-p output at 5 V supply), and unity-gain stability for simple buffer configurations. The OPA344PA datasheet cites "audio processing" as a primary application and demonstrates its use in a speech bandpass-filtered electret microphone circuit operating from 2.7 V–5 V with <500 µA total system current.
OPA344PA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- MicroAmplifier™
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 1
- 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
- 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:
- Through Hole
- Supplier Device Package:
- 8-PDIP
OPA344PA FAQ
1.How can I place an order for OPA344PA through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA344PA 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 OPA344PA reliable?
The price and inventory of OPA344PA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA344PA is usually 5 days.
3.What payment methods are accepted for OPA344PA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA344PA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA344PA?
OPA344PA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA344PA 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 OPA344PA?
For technical support, including OPA344PA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA344PA requirements.
6.How does Aetrix verify that OPA344PA is sourced from the original manufacturer or authorized distributors?
All OPA344PA 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 OPA344PA meets industry standards.
7.What is the process for return or replacement of OPA344PA?
All OPA344PA units undergo pre-shipment inspection (PSI). If there is an issue with OPA344PA, 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 OPA344PA part is unused and in its original packaging.
Return procedure for OPA344PA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
OPA344PA Tags
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