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Texas Instruments OPA343NA/250
- Part No.:
- OPA343NA/250
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SC-74A, SOT-753
- Datasheet:
-
OPA343NA/250.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,715
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Product details
Overview
OPA343NA/250 from Texas Instruments is a single-channel, rail-to-rail input/output CMOS operational amplifier optimized for low-voltage, single-supply operation (2.5V to 5.5V). It delivers 5.5MHz gain-bandwidth, 6V/µs slew rate, and 850µA quiescent current per channel, enabling high-fidelity signal conditioning in space-constrained, battery-powered systems such as portable data acquisition front-ends.
For engineers reviewing the OPA343NA/250 datasheet, OPA343NA/250 pinout, OPA343NA/250 application, or OPA343NA/250 equivalent, key selection criteria include rail-to-rail swing with ≤5mV from rails under 100kΩ load, input common-mode range extending 500mV beyond supply rails, ultra-low 0.2pA typical input bias current, and verified stability driving up to 1000pF capacitive loads in unity-gain configuration.
Technical Context
The OPA343NA/250 employs a complementary N/P-channel input stage to achieve rail-to-rail input operation, with a 400mV transition region where both pairs are active-causing potential degradation in PSRR, CMRR, and THD. Its class AB output stage enables true rail-to-rail output swing, maintaining >100dB open-loop gain at light loads (100kΩ) and supporting ±50mA short-circuit current.
Designed on a 0.6µm CMOS process, it is unity-gain stable and features low 25nV/√Hz input voltage noise and 8µVrms integrated noise (0.1–50kHz), making it suitable for precision analog signal paths where dynamic range and low distortion are critical, including A/D driver and audio line-level stages.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-Bandwidth Product | 5.5MHz - supports stable closed-loop operation up to 100kHz with gain ≥1, sufficient for medium-speed ADC buffering. |
| Slew Rate | 6V/µs - enables clean 2V-step response in ≤1µs (0.1% settling), critical for fast transient fidelity in sampling systems. |
| Input Bias Current | ±0.2pA (typ) - minimizes offset error in high-impedance sensor interfaces and transimpedance amplifiers. |
| Output Swing (vs Rail) | 1mV (typ) at 100kΩ load - preserves full dynamic range in 3.3V or 5V single-supply systems without headroom loss. |
| Quiescent Current | 0.85mA per amplifier - allows integration into always-on, low-power IoT sensor nodes without compromising speed. |
| THD+N | 0.0007% at 1kHz - meets high-fidelity audio and precision measurement requirements where harmonic purity is essential. |
| Input Voltage Range | –0.3V to (V+) + 0.3V - accepts signals beyond supply rails by 500mV, simplifying level-shifting in mixed-supply systems. |
Pinout & Package
SOT-23-5 surface-mount package (DBV drawing), 2.9mm × 1.6mm footprint, 1.1mm height, moisture sensitivity level (MSL) 1 - suitable for reflow assembly 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 on V+ for stability. |
| 2 (–IN) | Inverting input | High-impedance CMOS node; input protection diodes clamp to rails-limit external current to ≤10mA if driven beyond rails. |
| 3 (+IN) | Non-inverting input | Complementary differential pair input; operates down to –0.3V and up to V+ + 0.3V, enabling true single-supply signal acquisition. |
| 4 (V–) | Negative supply | Ground reference for single-supply operation; must be connected directly to system ground plane with low-inductance path. |
| 5 (V+) | Positive supply | Accepts 2.5V–5.5V; internal regulation ensures consistent performance across voltage range-no external regulation needed. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input and output | Enables full-scale signal utilization in 3.3V systems-no level-shifting circuitry required for 0–3.3V sensor outputs or DAC buffers. |
| Ultra-low input bias current | 0.2pA typical eliminates significant offset drift in high-Z pH electrodes, photodiode transimpedance, or piezoelectric sensor interfaces. |
| Unity-gain stable with 1000pF load | Eliminates need for external isolation resistors when driving ADC sample-and-hold capacitors or long PCB traces. |
| Low 25nV/√Hz voltage noise | Preserves SNR in microphone preamps and medical ECG front-ends where signal amplitudes are sub-millivolt. |
| Specified from –40°C to +85°C | Validated performance across industrial temperature range-no derating required for embedded control or automotive cabin modules. |
Applications
| Driving Sampling A/D Converters | Portable Audio Line-Level Processing |
|---|---|
Use Scenario: Buffering and gain-setting stage before a 12-bit SAR ADC (e.g., ADS7816) in a handheld multimeter or sensor logger. IC Role / Device Role / Timing Role: High-speed, low-distortion voltage follower or non-inverting amplifier providing charge injection immunity and rail-to-rail swing to maximize ADC effective resolution. Use Value: 0.0007% THD+N and 1µs 0.1% settling ensure accurate digitization of fast transients without harmonic aliasing or settling errors. | Use Scenario: Output buffer and headphone driver in a Bluetooth audio dongle operating from a single 3.3V Li-ion cell. IC Role / Device Role / Timing Role: Low-noise, rail-to-rail output stage delivering clean 1VRMS line-level signal to codec inputs while driving 10kΩ loads. Use Value: 25nV/√Hz noise density and 6V/µs slew rate prevent audible hiss or slew-induced distortion in 20Hz–20kHz audio band. |
| Low-Power Data Acquisition Front-End | Single-Supply Transimpedance Amplifier |
Use Scenario: Signal conditioning for thermistor or RTD bridges in battery-powered environmental monitoring nodes. IC Role / Device Role / Timing Role: Precision gain stage with rail-to-rail input accepting 0–3.3V bridge outputs and rejecting common-mode noise via high CMRR (>74dB). Use Value: 850µA quiescent current enables multi-year operation on coin-cell batteries while maintaining 5.5MHz bandwidth for fast calibration sweeps. | Use Scenario: Converting photocurrent from a silicon photodiode (e.g., 100pA–10µA range) into measurable voltage in optical smoke detectors. IC Role / Device Role / Timing Role: Ultra-low-input-bias-current transimpedance amplifier with 10MΩ feedback resistor and rail-to-rail output swing. Use Value: 0.2pA input bias current prevents significant DC error-critical for detecting weak photocurrents without baseline drift. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA333AIDBVR | Zero-drift architecture; 0.1µV/°C max offset drift vs. OPA343NA/250's ±3µV/°C; higher 300nA quiescent current. | Better for DC-precision applications (e.g., weigh scales); less optimal for AC-coupled audio or fast-settling ADC drivers. | Select OPA333AIDBVR only when microvolt-level offset stability over temperature is mandatory-and power budget allows +300% IQ increase. |
| MCP6001T-E/OT | Lower 1MHz GBW and 0.6V/µs slew rate; 100pA input bias current; identical SOT-23-5 package and 1.8–6.0V supply range. | Suitable for slower sensor interfaces (e.g., temperature, humidity) but cannot replace OPA343NA/250 in 100kHz+ signal paths or low-distortion audio. | Choose MCP6001T-E/OT for cost-sensitive, low-bandwidth designs where 5.5MHz bandwidth and 6V/µs slew are unnecessary. |
Compared with OPA343NA/250, OPA333AIDBVR trades bandwidth and power efficiency for superior DC accuracy, while MCP6001T-E/OT offers lower cost and voltage flexibility at the expense of speed and distortion performance-making OPA343NA/250 the optimal balance for high-fidelity, low-power, wideband analog signal chains.
Availability
OPA343NA/250 is available at Aetrix Electronics and suitable for portable instrumentation, battery-powered data loggers, and compact audio interfaces requiring stable component supply with guaranteed long-term manufacturability and RoHS-compliant green packaging.
Supply support for OPA343NA/250 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 signal chain solutions.
The OPA343NA/250 belongs to TI's microAmplifier™ series, designed specifically for miniature, low-cost, single-supply applications demanding rail-to-rail performance, low power, and high speed-targeting portable test equipment, PCMCIA peripherals, and consumer audio.
FAQ
What supply voltage range is supported by the OPA343NA/250?
The OPA343NA/250 operates from a single supply of 2.5V to 5.5V, with full specifications guaranteed from 2.7V to 5.0V across –40°C to +85°C. This allows direct use with common 3.3V and 5V rails without external regulators. The OPA343NA/250 maintains rail-to-rail input/output functionality and 5.5MHz bandwidth across this entire range, making it ideal for mixed-voltage portable systems.
Does the OPA343NA/250 require external compensation for unity-gain stability?
No, the OPA343NA/250 is internally compensated and unity-gain stable. It drives up to 1000pF capacitive loads in unity-gain configuration without oscillation, as confirmed in the SBOS090A datasheet's "Small-Signal Overshoot vs Capacitive Load" curve. For heavier loads, a 10Ω–20Ω series resistor at the output (as shown in Figure 4 of the datasheet) restores phase margin without degrading DC accuracy significantly.
What is the maximum input voltage allowed beyond the supply rails for the OPA343NA/250?
The OPA343NA/250 input terminals are diode-clamped to the supply rails. Input signals may swing up to 0.5V beyond V+ or below V–, provided input current is limited to ≤10mA using an external series resistor. Exceeding this violates Absolute Maximum Ratings and risks permanent damage. The OPA343NA/250's specified common-mode range is –0.3V to (V+) + 0.3V, ensuring safe linear operation within those bounds.
How does the OPA343NA/250 perform in transimpedance amplifier configurations?
The OPA343NA/250 excels in transimpedance applications due to its 0.2pA typical input bias current, 25nV/√Hz input voltage noise, and rail-to-rail output swing. With a 10MΩ feedback resistor, it achieves ~10V/µA gain while maintaining <1mV output offset error. Its low input capacitance and high GBW minimize peaking-especially when paired with a small feedback capacitor (e.g., 0.2–2pF) for stability, as validated in TI's Application Note SBAA227.
Is the OPA343NA/250 pin-compatible with other members of the OPA343 family?
The OPA343NA/250 in SOT-23-5 is not pin-compatible with SO-8 variants (e.g., OPA343UA), which have different pinouts (V– and V+ swapped, NC pins present). However, all OPA343 variants share identical electrical specifications-allowing drop-in functional replacement in new designs when layout permits SOT-23-5 placement. Always verify pin mapping against the specific package drawing (DBV for OPA343NA/250) before PCB layout.
OPA343NA/250 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/250 FAQ
1.How can I place an order for OPA343NA/250 through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA343NA/250 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/250 reliable?
The price and inventory of OPA343NA/250 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA343NA/250 is usually 5 days.
3.What payment methods are accepted for OPA343NA/250?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA343NA/250 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA343NA/250?
OPA343NA/250 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA343NA/250 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/250?
For technical support, including OPA343NA/250 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA343NA/250 requirements.
6.How does Aetrix verify that OPA343NA/250 is sourced from the original manufacturer or authorized distributors?
All OPA343NA/250 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/250 meets industry standards.
7.What is the process for return or replacement of OPA343NA/250?
All OPA343NA/250 units undergo pre-shipment inspection (PSI). If there is an issue with OPA343NA/250, 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/250 part is unused and in its original packaging.
Return procedure for OPA343NA/250:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
OPA343NA/250 Tags
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STMicroelectronics
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LM358DR
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LM358P
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