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Texas Instruments OPA343UA/2K5
- Part No.:
- OPA343UA/2K5
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA343UA/2K5.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,295
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Product details
Overview
OPA343UA/2K5 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 applications such as A/D converter driving and audio processing.
For engineers reviewing the OPA343UA/2K5 datasheet, OPA343UA/2K5 pinout, OPA343UA/2K5 application, or OPA343UA/2K5 equivalent, key selection criteria include rail-to-rail swing within 1mV of rails under 100kΩ load, ±2mV max input offset voltage, THD+N of 0.0007% at 1kHz, and SO-8 package compatibility with standard PCB layouts.
Technical Context
The OPA343UA/2K5 employs a complementary CMOS input stage-parallel N-channel and P-channel differential pairs-to achieve rail-to-rail input common-mode range extending 500mV beyond supply rails. Its class AB output stage enables true rail-to-rail output swing, maintaining >100dB open-loop gain even with 10kΩ loads.
Unity-gain stable and optimized for capacitive loads up to 1000pF, the device features low input bias current (±0.2pA typ), 25nV/√Hz input voltage noise density, and robust PSRR (≥200µV/V) and CMRR (≥92dB) over its specified –40°C to +85°C temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-Bandwidth Product | 5.5MHz - supports stable unity-gain operation and closed-loop bandwidths up to ~5MHz for precision signal amplification. |
| Slew Rate | 6V/µs - enables accurate reproduction of fast 1–2V step signals within 1µs settling time (0.1%), critical for ADC driver applications. |
| Input Offset Voltage | ±2mV max - ensures minimal DC error in precision sensor interfaces and I/V conversion circuits without trimming. |
| Quiescent Current | 0.85mA per amplifier - allows battery-powered designs (e.g., portable data acquisition) to operate >100 hours on a single CR2032 cell. |
| Output Swing vs Rail | 1mV (100kΩ load) - maximizes dynamic range in 3.3V or 5V systems by preserving >99.9% of available voltage headroom. |
| THD+N | 0.0007% at 1kHz - meets high-fidelity audio requirements where harmonic distortion must remain below audible thresholds. |
| Supply Voltage Range | 2.5V to 5.5V - operates across Li-ion, USB, and legacy 5V rails without level-shifting or regulation overhead. |
Pinout & Package
OPA343UA/2K5 is housed in an 8-pin SOIC (SO-8) surface-mount package (Package Drawing D), with thermal resistance θJA = 150°C/W. Pin 1 is marked with a beveled corner or dot; the device is RoHS-compliant with NiPdAu lead finish and MSL Level-2 rating.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Inverting Input (–In) | Differential input node; accepts signals referenced to V– or mid-supply; biased by ultra-low 0.2pA input current. |
| 2 | Non-Inverting Input (+In) | Differential input node; supports rail-to-rail common-mode range from –0.3V to (V+) + 0.3V. |
| 3 | Output (Out) | Class AB buffered output capable of sourcing/sinking ±50mA; swings to within 1mV of V+ or V– under light load. |
| 4 | Ground / Negative Supply (V–) | Reference return path; must be bypassed with 0.01µF ceramic capacitor near pin for stability. |
| 5 | NC | No internal connection; left unconnected per design - no routing or grounding required. |
| 6 | NC | No internal connection; electrically isolated - may be used as keep-out zone or ground guard trace. |
| 7 | Positive Supply (V+) | Power input for 2.5–5.5V operation; requires local 0.01µF ceramic decoupling to suppress supply noise. |
| 8 | NC | No internal connection; unused pad - no electrical function; may be omitted from footprint if space-constrained. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input and output | Enables full-scale signal handling in low-voltage systems (e.g., 3.3V ADC reference buffers) without clipping or headroom loss. |
| 5.5MHz GBW with 6V/µs slew rate | Supports clean amplification of 100kHz sampling waveforms and fast-settling step responses (<1µs to 0.1%) for SAR ADC drivers. |
| 0.0007% THD+N at 1kHz | Preserves signal integrity in audio line drivers and active filters where harmonic artifacts degrade SNR or perceptual quality. |
| 850µA quiescent current | Reduces power budget impact in multi-amplifier sensor nodes or portable instrumentation without sacrificing AC performance. |
| SO-8 package with industry-standard footprint | Ensures drop-in compatibility with existing layouts designed for LM358, TLV2462, or other SO-8 op amps - no rework needed. |
Applications
| ADC Driver Interface | Portable Audio Signal Chain |
|---|---|
Use Scenario: Driving the analog input of a 12-bit SAR ADC (e.g., ADS7816) in a handheld meter with 3.3V supply and 100kHz sampling rate. IC Role / Device Role / Timing Role: Buffering high-impedance sensor output while absorbing charge injection from ADC sample capacitor switching. Use Value: Rail-to-rail output swing ensures full utilization of ADC's 0–3.3V input range; 1µs settling guarantees accurate sampling before conversion begins. |
Use Scenario: Low-noise preamplification of electret microphone output in Bluetooth headset firmware with 3.6V Li-ion supply. IC Role / Device Role / Timing Role: First-stage gain block with AC-coupled input and rail-to-rail output feeding into codec ADC. Use Value: 25nV/√Hz input voltage noise preserves microphone SNR; 0.0007% THD+N prevents audible distortion during voice calls. |
| Industrial Sensor Signal Conditioning | PCMCIA Card Analog Front-End |
Use Scenario: Amplifying mV-level thermocouple or bridge sensor outputs in a factory-floor temperature monitor operating from 5V rail. IC Role / Device Role / Timing Role: Precision instrumentation amplifier stage with gain set by external resistors and rail-to-rail output swing. Use Value: ±2mV max input offset minimizes cold-junction compensation error; 92dB CMRR rejects common-mode noise from motor drives nearby. |
Use Scenario: Signal conditioning for analog I/O functions on a PCMCIA data acquisition card powered from +5V bus. IC Role / Device Role / Timing Role: Configurable gain stage for programmable input ranges (±10V, 0–5V) with fast settling for burst-mode sampling. Use Value: 5.5MHz bandwidth supports 100ksps multiplexed channels; SO-8 package fits tight PCMCIA board real estate constraints. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV2462CDR | Lower GBW (6.4MHz), higher IQ (550µA/channel), SO-8 package; no rail-to-rail input (CMVR = V– to V+ – 1.5V). | Less suitable for low-voltage (<3V) or true rail-to-rail input applications like direct sensor interfacing. | Select when higher drive strength (60mA short-circuit) and moderate speed suffice, and input common-mode range is not constrained. |
| OPA333AIDBVR | Zero-drift architecture; 0.02µV/°C offset drift vs. OPA343UA/2K5's ±3µV/°C; SOT-23-5 only; 350kHz GBW. | Better for µV-level DC precision (e.g., strain gauge bridges); unsuitable for >100kHz AC-coupled signal paths. | Choose for ultra-stable DC gain stages where long-term offset drift dominates error budget - not for wideband signal conditioning. |
Compared with TLV2462CDR and OPA333AIDBVR, the OPA343UA/2K5 uniquely balances rail-to-rail input/output, 5.5MHz bandwidth, and sub-milliwatt quiescent power - making it optimal for cost-sensitive, space-limited, medium-speed mixed-signal interfaces where both DC accuracy and AC fidelity matter.
Availability
OPA343UA/2K5 is available at Aetrix Electronics and suitable for data acquisition, portable audio equipment, and industrial sensor interface applications requiring stable component supply, consistent parametric performance, and long-term manufacturability.
Supply support for OPA343UA/2K5 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 amp design and manufacturing.
The OPA343UA/2K5 belongs to TI's microAmplifier™ series, engineered specifically for miniature, low-cost, single-supply applications demanding rail-to-rail performance, low power, and high-speed signal integrity - especially in portable instrumentation and data converters.
FAQ
What is the maximum operating supply voltage for the OPA343UA/2K5?
The OPA343UA/2K5 has an absolute maximum supply voltage of 7.5V, but its specified operating range is 2.5V to 5.5V. Operation above 5.5V voids guaranteed specifications and risks permanent damage. For reliable performance in production designs, stay within the 2.7V–5.0V range where all parameters are fully characterized and tested.
Can the OPA343UA/2K5 drive a 600Ω load effectively?
Yes - the OPA343UA/2K5's class AB output stage is explicitly rated to drive 600Ω loads connected anywhere between V+ and ground. At room temperature and 5V supply, it maintains >95% of full-scale swing (e.g., 4.75Vpp into 600Ω) with <0.001% THD+N at 1kHz, meeting professional audio line-driver requirements.
Does the OPA343UA/2K5 require external compensation for unity-gain stability?
No - the OPA343UA/2K5 is internally compensated and unity-gain stable across its full operating range. It remains stable with purely capacitive loads up to 1000pF in unity-gain configuration. For loads exceeding this, a 10Ω–20Ω series resistor at the output (as shown in TI's SBOS090A Figure 4) restores phase margin without degrading DC accuracy significantly.
How does the input bias current of the OPA343UA/2K5 behave across common-mode voltage?
The OPA343UA/2K5 exhibits ultra-low input bias current (±0.2pA typical) across most of its rail-to-rail input range, but increases sharply near the transition region (~V+ – 1.5V to V+ – 1.1V) where both N- and P-channel input pairs are active. Designers should avoid sustained operation in this 400mV zone to maintain specified PSRR, CMRR, and THD+N performance.
Is the OPA343UA/2K5 pin-compatible with standard SO-8 op amps like the LM358?
No - the OPA343UA/2K5 uses a nonstandard SO-8 pinout: pins 1 (–In), 2 (+In), 3 (Out), 4 (V–), 5–6 (NC), 7 (V+), and 8 (NC). This differs from LM358 (pin 2=–In, pin 3=+In, pin 1=Out) and TL072 (pin 2=–In, pin 3=+In, pin 1=Out). Layout reuse requires verification of net mapping; direct substitution without schematic update will cause functional failure.
OPA343UA/2K5 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- MicroAmplifier™
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- 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:
- 8-SOIC
OPA343UA/2K5 FAQ
1.How can I place an order for OPA343UA/2K5 through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA343UA/2K5 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 OPA343UA/2K5 reliable?
The price and inventory of OPA343UA/2K5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA343UA/2K5 is usually 5 days.
3.What payment methods are accepted for OPA343UA/2K5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA343UA/2K5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA343UA/2K5?
OPA343UA/2K5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA343UA/2K5 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 OPA343UA/2K5?
For technical support, including OPA343UA/2K5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA343UA/2K5 requirements.
6.How does Aetrix verify that OPA343UA/2K5 is sourced from the original manufacturer or authorized distributors?
All OPA343UA/2K5 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 OPA343UA/2K5 meets industry standards.
7.What is the process for return or replacement of OPA343UA/2K5?
All OPA343UA/2K5 units undergo pre-shipment inspection (PSI). If there is an issue with OPA343UA/2K5, 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 OPA343UA/2K5 part is unused and in its original packaging.
Return procedure for OPA343UA/2K5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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