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Texas Instruments OPA343UA/2K5G4
- Part No.:
- OPA343UA/2K5G4
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA343UA/2K5G4.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,596
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Product details
Overview
OPA343UA/2K5G4 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, with output swing within 1mV of rails under 100kΩ load - ideal for driving sampling A/D converters in space-constrained, low-power systems.
For engineers reviewing the OPA343UA/2K5G4 datasheet, OPA343UA/2K5G4 pinout, OPA343UA/2K5G4 application, or OPA343UA/2K5G4 equivalent, key selection criteria include rail-to-rail I/O performance at 2.7V–5V supply, THD+N of 0.0007% at 1kHz, input bias current ≤10pA, and SO-8 package compatibility with standard PCB layouts for signal conditioning and data acquisition front-ends.
Technical Context
The OPA343UA/2K5G4 employs a complementary CMOS input stage enabling rail-to-rail common-mode input range extending 500mV beyond supply rails, and a class AB output stage delivering true rail-to-rail voltage swing. Its unity-gain stability and 5.5MHz bandwidth support high-fidelity signal buffering without external compensation.
Designed for single-supply systems, it maintains specified performance from –40°C to +85°C, with input offset voltage ±2mV (typ), CMRR ≥74dB, and PSRR ≥40µV/V - critical for precision DC-coupled interfaces and low-noise analog signal chains where supply rejection and common-mode immunity directly impact measurement accuracy.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-Bandwidth Product | 5.5MHz - supports stable unity-gain buffering of signals up to ~500kHz with minimal phase lag in A/D driver applications. |
| Slew Rate | 6V/µs - enables accurate reproduction of fast 2V-step signals within 1µs settling time (0.1%), suitable for medium-speed sampling systems. |
| Input Offset Voltage | ±2mV (typ) - ensures <10mV total error in 12-bit systems with 5V full-scale, minimizing calibration burden in precision sensor interfaces. |
| Quiescent Current | 0.85mA per amplifier - allows battery-powered designs (e.g., portable data loggers) to operate >100 hours on a 200mAh cell at 3.3V. |
| THD+N | 0.0007% at 1kHz - preserves audio and communication signal integrity, meeting requirements for 16-bit+ dynamic range in active filters and line drivers. |
| Rail-to-Rail Output Swing | Within 1mV of rails (100kΩ load) - maximizes usable dynamic range in low-voltage systems (e.g., 3.3V ADC reference buffers), reducing headroom loss. |
| Input Bias Current | ±0.2pA (typ) - prevents significant voltage error across high-impedance sources (>1MΩ), essential for photodiode transimpedance and pH sensor amplifiers. |
Pinout & Package
OPA343UA/2K5G4 is packaged in an 8-pin SOIC (SO-8) surface-mount package with standard JEDEC MS-012AC footprint and 1.27mm lead pitch. Thermal resistance θJA = 150°C/W enables reliable operation at ambient temperatures up to +85°C with minimal heatsinking.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | +In | Non-inverting input terminal; accepts common-mode voltages from –0.3V to V+ + 0.3V, enabling direct interfacing with sensors operating near supply rails. |
| 2 | –In | Inverting input terminal; differential pair node with ultra-low bias current (<10pA) minimizes error in high-Z feedback networks. |
| 3 | Out | Amplifier output; delivers rail-to-rail swing (1mV from rails, 100kΩ load) and drives capacitive loads up to 1000pF without instability in unity-gain configuration. |
| 4 | V– | Negative supply pin; tied to ground in single-supply operation; must be bypassed with 0.01µF ceramic capacitor for high-frequency PSRR optimization. |
| 5 | NC | No-connect pin; electrically isolated and unused - no routing or thermal connection required on PCB layout. |
| 6 | NC | No-connect pin; electrically isolated and unused - no routing or thermal connection required on PCB layout. |
| 7 | V+ | Positive supply pin; operates from 2.5V to 5.5V; quiescent current remains stable across this range, simplifying multi-rail system power design. |
| 8 | NC | No-connect pin; electrically isolated and unused - no routing or thermal connection required on PCB layout. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input and output | Enables full utilization of 2.5V–5.5V supply range: input accepts signals 500mV beyond rails; output swings to within 1mV of rails (100kΩ), maximizing SNR in low-voltage data acquisition. |
| Low quiescent current (0.85mA) | Reduces power dissipation to <2.8mW at 3.3V, supporting always-on sensor nodes and energy-harvesting systems without compromising bandwidth or precision. |
| High-speed performance (5.5MHz GBW, 6V/µs SR) | Supports clean buffering of 100kHz sampling waveforms with <1µs 0.1% settling, eliminating distortion in ADC front-end drive stages for 12-bit+ converters. |
| Ultra-low THD+N (0.0007%) | Preserves harmonic fidelity in audio paths and communication channels, meeting requirements for Class D amplifier inputs and RF IF-stage filtering. |
| CMOS input stage (≤10pA IB) | Eliminates loading errors in high-impedance source applications (e.g., piezoelectric sensors, pH electrodes), avoiding drift and gain inaccuracies in precision measurement circuits. |
Applications
| Driving A/D Converters | PCMCIA Card Signal Conditioning |
|---|---|
Use Scenario: Buffering analog sensor outputs before sampling by a 12-bit, 100kHz ADS7816 ADC in a compact industrial data logger. IC Role / Device Role / Timing Role: Single-supply rail-to-rail op amp configured as unity-gain buffer to isolate ADC input capacitance and suppress charge injection artifacts. Use Value: Maintains 0.0007% THD+N and settles within 1µs, ensuring accurate digitization of fast transients without requiring external RC filtering or calibration. |
Use Scenario: Level-shifting and amplifying audio line-level signals in a PCMCIA sound card operating from +3.3V only. IC Role / Device Role / Timing Role: Low-noise, rail-to-rail I/O amplifier providing gain and DC blocking in the analog input path prior to CODEC interface. Use Value: Delivers 5.5MHz bandwidth and 6V/µs slew rate to preserve transient response, while 850µA quiescent current extends battery life in portable host systems. |
| Active Filter Design | Audio Processing Front-End |
Use Scenario: Implementing a 2.4kHz bandpass filter for speech processing in a VoIP endpoint using dual OPA2343, with OPA343UA/2K5G4 as reference design variant. IC Role / Device Role / Timing Role: Precision op amp in Sallen-Key topology providing programmable cutoff frequency and low-pass/high-pass roll-off control. Use Value: Rail-to-rail output swing ensures full dynamic range utilization across 3.3V supply; low input bias current prevents Q-factor drift in high-Z feedback networks. |
Use Scenario: Pre-amplifying microphone signals in a USB headset with integrated DAC, powered from 3.3V USB bus. IC Role / Device Role / Timing Role: Low-noise, low-distortion op amp serving as first-stage gain block with adjustable gain via external resistors. Use Value: 0.0007% THD+N at 1kHz and 25nV/√Hz input voltage noise preserve voice clarity; rail-to-rail I/O accommodates wide input signal excursions without clipping. |
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 | Higher precision: ±0.5mV max offset voltage vs. ±8mV for OPA343UA/2K5G4; lower noise (12nV/√Hz); same SO-8 package and pinout. | Better suited for high-accuracy 16-bit+ data acquisition where offset drift and noise dominate error budget. | Select OPA340UA/2K5 when absolute DC accuracy and sub-10nV/√Hz noise are required; OPA343UA/2K5G4 remains optimal for cost-sensitive, medium-precision applications with tighter power constraints. |
| MCP6001T-I/OT | Lower bandwidth (1MHz vs. 5.5MHz); higher quiescent current (100µA vs. 850µA); SOT-23-5 package (5-pin, different pinout). | Targeted at ultra-low-power, low-frequency sensor interfaces (e.g., temperature monitoring), not high-speed A/D driving. | Choose MCP6001T-I/OT only for sub-100kHz applications where 100µA supply current is critical; OPA343UA/2K5G4 is superior for bandwidth-demanding roles like active filtering or audio. |
Compared with OPA340UA/2K5, OPA343UA/2K5G4 trades minor DC precision for significantly higher speed and lower cost; versus MCP6001T-I/OT, it delivers 5.5× more bandwidth and rail-to-rail output swing at only ~8.5× higher quiescent current - making it the balanced choice for general-purpose, single-supply signal conditioning where speed, dynamic range, and supply flexibility matter most.
Availability
OPA343UA/2K5G4 is available at Aetrix Electronics and suitable for data acquisition, audio processing, and A/D converter driving applications requiring stable component supply, RoHS-compliant packaging, and guaranteed -40°C to +85°C operation.
Supply support for OPA343UA/2K5G4 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 innovation in precision amplifiers, data converters, and power management ICs.
The OPA343 series belongs to TI's microAmplifier™ portfolio, designed specifically for miniature, low-cost, single-supply applications demanding rail-to-rail I/O, low power, and high-speed performance in portable and space-constrained systems.
FAQ
What is the operating supply voltage range for OPA343UA/2K5G4?
The OPA343UA/2K5G4 operates from a single supply of 2.5V to 5.5V, with full specifications guaranteed over 2.7V to 5V. This wide range allows direct integration into 3.3V and 5V systems without level-shifting, and supports battery-powered designs down to two alkaline cells. The OPA343UA/2K5G4 maintains rail-to-rail input/output functionality across this entire voltage span.
Does OPA343UA/2K5G4 support rail-to-rail input and output simultaneously?
Yes, the OPA343UA/2K5G4 features true rail-to-rail input and output operation. Its complementary CMOS input stage accepts common-mode voltages from –0.3V to V+ + 0.3V, while the class AB output delivers swing within 1mV of both supply rails under 100kΩ load. This capability is fully characterized and guaranteed in the OPA343UA/2K5G4 datasheet across –40°C to +85°C.
What is the maximum capacitive load OPA343UA/2K5G4 can drive stably in unity-gain configuration?
The OPA343UA/2K5G4 remains stable with capacitive loads up to 1000pF in unity-gain configuration, as confirmed by TI's typical performance curves and application notes. For loads exceeding this, a 10Ω–20Ω series resistor at the output (as shown in Figure 4 of SBOS090A) restores phase margin without degrading DC accuracy significantly when used with moderate resistive loads.
How does the input bias current of OPA343UA/2K5G4 affect high-impedance sensor interfaces?
With a typical input bias current of ±0.2pA and maximum of ±10pA, the OPA343UA/2K5G4 introduces negligible voltage error across feedback or source impedances up to 100MΩ - making it suitable for photodiode transimpedance amplifiers, pH electrode buffers, and other high-Z sensor front-ends. This performance is intrinsic to its CMOS input architecture and is validated across temperature in the OPA343UA/2K5G4 specification table.
Is OPA343UA/2K5G4 pin-compatible with other members of the OPA343 family?
Yes, the OPA343UA/2K5G4 in SO-8 package shares identical pinout with all other SO-8 variants of the OPA343 family, including OPA343NA and OPA343UA variants. Pin 1 is +In, Pin 2 is –In, Pin 3 is Out, Pin 4 is V–, Pins 5–6 are NC, Pin 7 is V+, and Pin 8 is NC - enabling drop-in replacement within the same package footprint without PCB redesign.
OPA343UA/2K5G4 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:
- Discontinued at Digi-Key
- 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/2K5G4 FAQ
1.How can I place an order for OPA343UA/2K5G4 through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA343UA/2K5G4 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/2K5G4 reliable?
The price and inventory of OPA343UA/2K5G4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA343UA/2K5G4 is usually 5 days.
3.What payment methods are accepted for OPA343UA/2K5G4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA343UA/2K5G4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA343UA/2K5G4?
OPA343UA/2K5G4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA343UA/2K5G4 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/2K5G4?
For technical support, including OPA343UA/2K5G4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA343UA/2K5G4 requirements.
6.How does Aetrix verify that OPA343UA/2K5G4 is sourced from the original manufacturer or authorized distributors?
All OPA343UA/2K5G4 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/2K5G4 meets industry standards.
7.What is the process for return or replacement of OPA343UA/2K5G4?
All OPA343UA/2K5G4 units undergo pre-shipment inspection (PSI). If there is an issue with OPA343UA/2K5G4, 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/2K5G4 part is unused and in its original packaging.
Return procedure for OPA343UA/2K5G4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
OPA343UA/2K5G4 Tags
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