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Texas Instruments OPA343UA
- Part No.:
- OPA343UA
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA343UA.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,765
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Product details
Overview
OPA343UA 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, 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, battery-powered data acquisition systems.
For engineers reviewing the OPA343UA datasheet, OPA343UA pinout, OPA343UA application, or OPA343UA 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 legacy PCB layouts.
Technical Context
The OPA343UA employs a complementary CMOS input stage enabling ±0.5V beyond supply rail common-mode range, with a transition region near (V+) – 1.3V where both N- and P-channel pairs operate. Its class AB output stage supports rail-to-rail swing into loads ≥2kΩ while maintaining >100dB open-loop gain at 100kΩ load.
Designed for unity-gain stability, it drives up to 1000pF capacitive loads without external compensation. Input voltage noise is 25nV/√Hz at 1kHz, and channel separation exceeds 100dB at 1kHz - critical for precision signal conditioning in multi-channel sensor interfaces.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-Bandwidth Product | 5.5MHz - supports stable closed-loop gain ≥10 at 500kHz for anti-aliasing filter design. |
| Slew Rate | 6V/µs - enables full-scale settling of 2V step in ≤1µs (0.1%), suitable for 100kHz sampling ADC drivers. |
| Input Offset Voltage | ±2mV (typ) - ensures ≤0.04% gain error in 5V-range instrumentation amplifiers. |
| Quiescent Current | 0.85mA per amplifier - allows dual-channel operation below 2mA total, ideal for portable medical sensors. |
| Output Swing | Within 1mV of rails (100kΩ load) - maximizes dynamic range in 3.3V or 5V single-supply systems. |
| THD+N | 0.0007% at 1kHz - meets audio-grade line driver requirements without post-filtering. |
| Input Bias Current | ±0.2pA (typ) - minimizes voltage error across high-impedance sources like piezoelectric sensors. |
Pinout & Package
OPA343UA is housed in an SO-8 surface-mount package (Package Drawing D, JEDEC MS-012), with thermal resistance θJA = 150°C/W. Pin 1 is marked by a beveled corner or dot; device marking reads "OPA343UA".
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | +In | Non-inverting input terminal; accepts common-mode voltages from –0.3V to (V+) + 0.3V. |
| 2 | –In | Inverting input terminal; differential pair node with <10pA bias current. |
| 3 | Out | Amplified output; swings rail-to-rail into ≥100kΩ load with <5mV headroom. |
| 4 | V– | Negative supply rail (typically ground in single-supply configs); bypass with 0.01µF ceramic. |
| 5 | NC | No connect - internal die pad not bonded; must remain unconnected on PCB. |
| 6 | NC | No connect - internal test structure; floating or grounded per layout best practice. |
| 7 | V+ | Positive supply rail (2.5V–5.5V); requires local 0.01µF ceramic decoupling. |
| 8 | NC | No connect - unused bond wire; no electrical function; leave unconnected. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input/output | Extends usable input range 500mV beyond supply rails and output swing to within 1mV of rails - preserves full-scale resolution in low-voltage ADC front-ends. |
| Low quiescent current | 850µA per amplifier at 5V - enables always-on sensor signal conditioning in energy-harvesting IoT nodes. |
| High-speed precision | 5.5MHz GBW + 6V/µs SR with 0.0007% THD+N - supports clean 12-bit+ data acquisition at 100ksps without distortion artifacts. |
| Ultra-low input bias current | 0.2pA typical - eliminates significant offset drift in high-Z pH or photodiode transimpedance circuits. |
| Unity-gain stable | Drives ≥1000pF capacitive loads without oscillation - simplifies interface to long traces or ADC input capacitance without isolation resistors. |
Applications
| Driving Sampling A/D Converters | PCMCIA Card Signal Conditioning |
|---|---|
Use Scenario: Buffering and gain-setting for 12-bit ADS7816 sampling ADC in portable data loggers. IC Role / Device Role / Timing Role: Single-supply op amp providing rail-to-rail drive, charge injection immunity, and 1µs 0.1% settling for 100kHz sample clock. Use Value: Eliminates external level-shifting; maintains full 0–5V input range with <0.01% gain error and no missing codes. | Use Scenario: Analog front-end for audio codec in PCMCIA modem cards with tight board area constraints. IC Role / Device Role / Timing Role: Low-noise, low-power line driver with 25nV/√Hz input noise and 850µA IQ for battery-backed operation. Use Value: Enables 16-bit audio fidelity at 48ksps using only 3.3V supply; SO-8 footprint matches legacy card layouts. |
| Active Low-Pass Filtering | Transimpedance Amplification |
Use Scenario: 2nd-order Sallen-Key filter in handheld medical ECG monitors requiring DC–150Hz bandwidth. IC Role / Device Role / Timing Role: Unity-gain stable amplifier implementing filter poles with <0.1dB passband ripple. Use Value: Achieves 92dB CMRR and 74dB PSRR at 60Hz - rejects mains interference without trimming. | Use Scenario: Photodiode current-to-voltage conversion in optical smoke detectors with 100MΩ feedback. IC Role / Device Role / Timing Role: Ultra-low-input-bias amplifier minimizing dark-current-induced offset drift over temperature. Use Value: Maintains <10µV offset drift over –40°C to +85°C - extends calibration interval to 2 years. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA340UA | Higher precision: 125µV max VOS, 0.25µV/°C drift vs. OPA343UA's ±2mV / ±3µV/°C | Better suited for 16-bit+ precision measurement where offset stability dominates speed | Select OPA340UA when VOS drift <0.5µV/°C required; OPA343UA preferred for cost-sensitive 12-bit systems needing 6V/µs SR |
| MCP6001T-I/OT | Lower speed: 1MHz GBW, 0.6V/µs SR; higher IQ: 100µA vs. OPA343UA's 850µA | Targeted at ultra-low-power sensor nodes where bandwidth <100kHz suffices | Choose MCP6001T-I/OT for sub-100µA systems; OPA343UA when 5.5MHz GBW and rail-to-rail I/O are mandatory |
Compared with OPA340UA and MCP6001T-I/OT, OPA343UA uniquely balances 5.5MHz bandwidth, rail-to-rail I/O, and 850µA quiescent current in SO-8 - making it optimal for 12-bit data acquisition where speed, dynamic range, and board space are co-constrained.
Availability
OPA343UA is available at Aetrix Electronics and suitable for data acquisition, portable medical devices, and industrial sensor interfaces requiring stable component supply, RoHS-compliant packaging, and guaranteed -40°C to +85°C operation.
Supply support for OPA343UA 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 amplifiers and signal chain solutions.
The OPA343 series belongs to TI's microAmplifier™ portfolio, designed specifically for miniature, low-voltage, rail-to-rail operational amplifier applications in portable instrumentation, sensor interfaces, and power-constrained data acquisition systems.
FAQ
What supply voltage range does the OPA343UA support?
The OPA343UA 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 extended range allows reliable use in Li-ion (3.0–4.2V) and USB-powered (4.75–5.25V) systems without derating. The OPA343UA maintains rail-to-rail input/output functionality and 5.5MHz bandwidth across this entire voltage window.
Does the OPA343UA require external compensation for unity-gain stability?
No, the OPA343UA is internally compensated for unity-gain stability and drives up to 1000pF capacitive loads without external components. Its phase margin remains >60° at G = 1 with CL ≤ 1000pF, as verified in the SBOS090A datasheet Figure 11. For loads exceeding 1000pF, a 10Ω–20Ω series resistor between output and load restores stability without compromising DC accuracy in most configurations.
What is the maximum output current capability of the OPA343UA?
The OPA343UA provides ±50mA short-circuit output current per the absolute maximum ratings, but its useful linear output current is limited by voltage swing degradation. At room temperature with 5V supply, it delivers ±40mA while maintaining output swing within 50mV of rails (RL = 2kΩ). Continuous operation above ±20mA requires attention to thermal dissipation due to θJA = 150°C/W in SO-8.
How does the OPA343UA's rail-to-rail input stage handle signals beyond the supply rails?
The OPA343UA input stage includes diode clamps that allow safe operation with input voltages up to ±0.5V beyond V+ or V–, provided input current is limited to ≤10mA. Exceeding this current risks latch-up or permanent damage. For overvoltage protection, TI recommends a series resistor (e.g., 1kΩ) when inputs may swing >500mV beyond rails - as detailed in SBOS090A Figure 3.
Is the OPA343UA pin-compatible with other members of the OPA343 family?
Yes, the OPA343UA (SO-8) shares identical pinout with the OPA2343UA (dual, SO-8) for channels A and B, enabling drop-in replacement in single-amplifier positions. However, it is not pin-compatible with the SOT-23-5 variant (OPA343NA), which has different pin numbering and lacks NC pins. Always verify PCB footprint and schematic symbol against the specific ordering option.
OPA343UA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- MicroAmplifier™
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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 FAQ
1.How can I place an order for OPA343UA through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA343UA 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 reliable?
The price and inventory of OPA343UA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA343UA is usually 5 days.
3.What payment methods are accepted for OPA343UA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA343UA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA343UA?
OPA343UA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA343UA 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?
For technical support, including OPA343UA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA343UA requirements.
6.How does Aetrix verify that OPA343UA is sourced from the original manufacturer or authorized distributors?
All OPA343UA 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 meets industry standards.
7.What is the process for return or replacement of OPA343UA?
All OPA343UA units undergo pre-shipment inspection (PSI). If there is an issue with OPA343UA, 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 part is unused and in its original packaging.
Return procedure for OPA343UA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
OPA343UA Tags
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