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Texas Instruments OPA343NA/3K
- Part No.:
- OPA343NA/3K
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SC-74A, SOT-753
- Datasheet:
-
OPA343NA/3K.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:8,785
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Product details
Overview
OPA343NA/3K from Texas Instruments is a single-channel, rail-to-rail input/output CMOS operational amplifier in SOT-23-5 package, optimized for low-voltage (2.5V–5.5V), single-supply operation. It delivers 5.5MHz gain-bandwidth, 6V/µs slew rate, 850µA quiescent current per channel, and output swing within 1mV of rails under 100kΩ load - ideal for driving sampling A/D converters in space-constrained portable instrumentation.
For engineers reviewing the OPA343NA/3K datasheet, OPA343NA/3K pinout, OPA343NA/3K application, or OPA343NA/3K equivalent, key selection criteria include rail-to-rail dynamic range at 2.7V supply, THD+N of 0.0007% at 1kHz, input bias current ≤10pA, and verified stability with ≥100pF capacitive loads in unity-gain configuration.
Technical Context
The OPA343NA/3K employs a complementary differential input stage (N- and P-channel pairs) enabling input common-mode voltage range extending 500mV beyond both supply rails. Its class AB output stage achieves rail-to-rail swing with <5mV headroom into 100kΩ at TA = +25°C.
It is unity-gain stable and features a double-folded cascode architecture that combines signals from both input pairs while maintaining low noise (25nV/√Hz) and high open-loop gain (120dB typical). Channel separation exceeds 100dB up to 100kHz, confirming suitability for multi-channel signal conditioning without crosstalk.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-Bandwidth Product | 5.5MHz - supports closed-loop bandwidth >1MHz at G=5, sufficient for 12-bit ADC driver settling in <1µs. |
| Slew Rate | 6V/µs - enables full-scale 3Vp-p output transitions in <0.5µs, critical for fast-settling data acquisition front-ends. |
| Input Offset Voltage | ±2mV (max) - ensures <0.1% gain error in precision I/V conversion at 2.5V full-scale. |
| Quiescent Current | 0.85mA per amplifier - allows battery-powered designs to sustain >100-hour operation on a 100mAh coin cell. |
| THD+N @ 1kHz | 0.0007% - meets audio-grade linearity requirements for microphone preamp or DAC output buffering. |
| Input Bias Current | ±0.2pA (typ) - minimizes voltage error across high-impedance sensor interfaces (>1GΩ source impedance). |
| Output Swing (100kΩ) | Within 1mV of V+ and V− - preserves >99.9% of available dynamic range in 3.3V systems. |
Pinout & Package
SOT-23-5 surface-mount package (DBV drawing), 1.6mm × 2.9mm footprint, 1.1mm height, moisture sensitivity level (MSL) 1 - suitable for reflow soldering without dry-pack requirements.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUT) | Amplifier output | Class AB rail-to-rail output capable of sourcing/sinking ±50mA; requires 0.01µF bypass capacitor at V+ for stability. |
| 2 (–IN) | Inverting input | High-impedance node (10¹³Ω || 6pF); clamped to rails via internal diodes - limit input overvoltage to ±0.5V beyond supplies. |
| 3 (+IN) | Non-inverting input | Complementary input pair enables operation down to V– – 0.3V and up to V+ + 0.3V; transition region near V+ – 1.3V may degrade PSRR. |
| 4 (V–) | Negative supply | Ground reference for single-supply operation; must be decoupled with 0.01µF ceramic capacitor placed ≤2mm from pin. |
| 5 (V+) | Positive supply | Accepts 2.5V–5.5V; quiescent current varies <5% across this range - enables direct Li-ion or USB-powered operation. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input/output | Extends usable input range to –0.3V to V+ + 0.3V and output swing to within 1mV of rails - maximizes SNR in low-voltage ADC drivers. |
| Low THD+N (0.0007%) | Enables clean audio signal paths without post-filtering; verified at 3Vp-p, 1kHz, G=1 - suitable for headphone amp buffer stages. |
| Ultra-low input bias current (0.2pA) | Permits direct connection to piezoelectric sensors or photodiode transimpedance nodes without guard rings or T-network compensation. |
| Unity-gain stability | Operates stably with no external compensation in G=1 configurations - simplifies PCB layout for anti-aliasing filters and voltage followers. |
| Wide supply range (2.5V–5.5V) | Eliminates need for LDO regulation in mixed-voltage systems; performance remains specified from 2.7V - compatible with 3.3V and 5V rails. |
Applications
| Driving Sampling A/D Converters | PCMCIA Card Signal Conditioning |
|---|---|
Use Scenario: Buffering analog inputs to 12-bit ADS7816 sampling ADC in handheld meter with 3.3V supply and space-limited MSOP-8 layout. IC Role / Device Role / Timing Role: Unity-gain voltage follower isolating ADC input capacitance (20pF) and absorbing charge injection spikes during sample/hold switching. Use Value: Settles to 0.1% in 1µs with 100pF load, preserving 12-bit accuracy without external RC filtering or gain-stage recalibration. |
Use Scenario: Signal amplification and level-shifting for audio codec interface in legacy PCMCIA modem card operating from 5V bus power. IC Role / Device Role / Timing Role: Non-inverting amplifier (G=2) converting ±1V line-level signals to 0–5V range compatible with 8-bit microcontroller ADC. Use Value: Rail-to-rail output delivers full 5V swing into 10kΩ load; 5.5MHz bandwidth prevents phase distortion in 20kHz audio band. |
| Portable Data Acquisition Front-End | Low-Power Active Filter Stage |
Use Scenario: Battery-powered environmental sensor node measuring thermistor and humidity bridge outputs with 10-bit SAR ADC. IC Role / Device Role / Timing Role: Precision I/V converter and gain stage for 100µA sensor current, referenced to mid-supply (1.65V) for bipolar signal handling. Use Value: 850µA quiescent current extends 2-year battery life; ±2mV offset ensures <0.05°C temperature error in 10kΩ/10kΩ bridge. |
Use Scenario: Second-order Sallen-Key low-pass filter (fc = 10kHz) in wearable ECG monitor requiring DC-coupled biopotential amplification. IC Role / Device Role / Timing Role: Active filter integrator with rail-to-rail input accepting ±1.5V electrode signals and rejecting common-mode interference. Use Value: Input CMVR extends to V– – 0.3V enables true DC coupling; 25nV/√Hz input noise maintains >80dB SNR at 10Hz. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA340UA/2K5 | Lower input offset (±125µV max), higher GBW (8MHz), but higher IQ (1.6mA) and narrower supply range (2.7V–5.5V only). | Better suited for high-accuracy 16-bit data acquisition where offset drift dominates error budget. | Select OPA340UA/2K5 when offset voltage <0.5mV and 0.1ppm/°C drift are mandatory; accept 88% higher power consumption. |
| MCP6001T-E/OT | Lower cost, same SOT-23-5 package, but lower GBW (1MHz), slower slew rate (0.6V/µs), and higher THD+N (0.01%). | Targeted at non-critical consumer sensor interfaces where bandwidth <100kHz suffices. | Choose MCP6001T-E/OT for cost-sensitive volume production where 5.5MHz bandwidth and 6V/µs slew are unnecessary. |
Compared with OPA343NA/3K, OPA340UA/2K5 improves DC precision at the expense of power efficiency, while MCP6001T-E/OT reduces system cost but sacrifices AC performance - making OPA343NA/3K the optimal balance for portable 12-bit data acquisition requiring rail-to-rail dynamics and sub-1µs settling.
Availability
OPA343NA/3K is available at Aetrix Electronics and suitable for portable instrumentation, battery-powered data loggers, and space-constrained PCMCIA peripherals requiring stable component supply with guaranteed long-term availability.
Supply support for OPA343NA/3K 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 OPA343 series belongs to TI's microAmplifier™ portfolio, designed specifically for miniature, single-supply applications demanding rail-to-rail performance, low quiescent current, and robust stability in compact layouts.
FAQ
What supply voltage range is supported by the OPA343NA/3K?
The OPA343NA/3K operates from 2.5V to 5.5V, with full specifications guaranteed from 2.7V to 5.0V across –40°C to +85°C. Its ability to function at 2.5V enables direct integration with single-cell Li-ion or alkaline battery systems without voltage regulation, while maintaining 5.5MHz bandwidth and rail-to-rail output swing.
Can the OPA343NA/3K drive capacitive loads without oscillation?
Yes - the OPA343NA/3K is unity-gain stable and drives up to 1000pF with minimal overshoot in G=1 configuration. For loads >100pF, adding a 10Ω–20Ω series resistor at the output improves phase margin without significant DC error (e.g., 0.2% with 10kΩ load), as confirmed in TI SBOS090A Figure 4.
How does the rail-to-rail input stage of the OPA343NA/3K behave near the positive supply rail?
The OPA343NA/3K uses parallel N- and P-channel input pairs, creating a 400mV transition region near V+ – 1.3V where both stages conduct. Within this zone, PSRR, CMRR, and THD may degrade; TI recommends avoiding sustained operation here. Input common-mode range is fully specified from –0.3V to V+ + 0.3V outside this region.
What is the thermal resistance (θJA) of the OPA343NA/3K in its SOT-23-5 package?
The OPA343NA/3K in SOT-23-5 (DBV) package has a junction-to-ambient thermal resistance of 200°C/W, measured on a standard 2-layer JEDEC test board. This value assumes minimal copper pour; adding thermal vias and 1-inch² copper pad reduces θJA to ~120°C/W, allowing continuous 850µA operation at +85°C ambient.
Is the OPA343NA/3K suitable for audio line-driver applications?
Yes - the OPA343NA/3K delivers 0.0007% THD+N at 1kHz and 3Vp-p output, 25nV/√Hz input voltage noise, and rail-to-rail swing into 10kΩ, meeting requirements for line-level headphone buffer and DAC output stages. Its 5.5MHz bandwidth ensures flat response through 20kHz with margin for filter roll-off.
OPA343NA/3K Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- MicroAmplifier™
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 1
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 6V/µs
- Gain Bandwidth Product:
- 5.5 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 0.2 pA
- Voltage - Input Offset:
- 2 mV
- Current - Supply:
- 850µA
- Current - Output / Channel:
- 50 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:
- SOT-23-5
OPA343NA/3K FAQ
1.How can I place an order for OPA343NA/3K through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA343NA/3K 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 OPA343NA/3K reliable?
The price and inventory of OPA343NA/3K are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA343NA/3K is usually 5 days.
3.What payment methods are accepted for OPA343NA/3K?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA343NA/3K transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA343NA/3K?
OPA343NA/3K orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA343NA/3K 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 OPA343NA/3K?
For technical support, including OPA343NA/3K datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA343NA/3K requirements.
6.How does Aetrix verify that OPA343NA/3K is sourced from the original manufacturer or authorized distributors?
All OPA343NA/3K 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 OPA343NA/3K meets industry standards.
7.What is the process for return or replacement of OPA343NA/3K?
All OPA343NA/3K units undergo pre-shipment inspection (PSI). If there is an issue with OPA343NA/3K, 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 OPA343NA/3K part is unused and in its original packaging.
Return procedure for OPA343NA/3K:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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