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Texas Instruments OPA4343UA/2K5
- Part No.:
- OPA4343UA/2K5
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA4343UA/2K5.pdf
- Description:
- IC CMOS 4 CIRCUIT 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,800
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Product details
Overview
OPA4343UA/2K5 from Texas Instruments is a quad 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 per channel quiescent current, and output swing within 1mV of rails under 100kΩ load - enabling high-fidelity signal conditioning in space-constrained data acquisition and A/D driver applications.
For engineers reviewing the OPA4343UA/2K5 datasheet, OPA4343UA/2K5 pinout, OPA4343UA/2K5 application, or OPA4343UA/2K5 equivalent, key selection criteria include rail-to-rail dynamic range at 2.7V supply, THD+N of 0.0007% at 1kHz, channel separation >100dB, microamp-level input bias current (±0.2pA typ), and SSOP-16 thermal resistance of 100°C/W.
Technical Context
The OPA4343UA/2K5 employs a complementary CMOS input stage enabling rail-to-rail input common-mode range extending 500mV beyond supply rails, paired with a class AB output stage delivering true rail-to-rail output swing. Its unity-gain stability supports direct use in buffer and gain configurations without external compensation.
Each of the four amplifiers operates with fully independent circuitry - eliminating crosstalk and interaction - and shares identical AC/DC specifications across temperature (–40°C to +85°C) and supply (2.7V to 5.5V), ensuring predictable performance in multi-channel systems like sensor front-ends and active filter banks.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-Bandwidth Product | 5.5MHz - supports stable closed-loop gain up to 100× at 55kHz or unity-gain buffering of signals ≤5.5MHz. |
| Slew Rate | 6V/µs - enables clean 2V-step response in ≤1µs (0.1% settling), critical for driving sampling ADC inputs without distortion. |
| Input Offset Voltage | ±2mV (max) - ensures <10mV total error in precision DC-coupled gain stages with gain ≤5. |
| THD+N @ 1kHz | 0.0007% - preserves audio and communication signal integrity with minimal harmonic contamination. |
| Quiescent Current / Chan | 0.85mA (typ) - allows four-channel operation at <3.4mA total, suitable for battery-powered portable instrumentation. |
| Input Bias Current | ±0.2pA (typ) - minimizes voltage error across high-impedance sources (e.g., pH electrodes, photodiode transimpedance). |
| Output Swing (100kΩ) | Within 1mV of V+ and V− - maximizes usable dynamic range in 3.3V or 5V single-supply systems. |
Pinout & Package
OPA4343UA/2K5 is packaged in a 14-pin SOIC (Small Outline Integrated Circuit) with exposed pad not present; package drawing D, thermal resistance θJA = 100°C/W. Pin numbering follows standard SOIC convention (pin 1 = top-left corner, counterclockwise).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Out A | Amplifier A output - drives loads up to 100kΩ while maintaining rail-to-rail swing and low distortion. |
| 2 | –In A | Inverting input of Amp A - high-impedance node (1013Ω || 6pF) compatible with high-Z sensors. |
| 3 | +In A | Non-inverting input of Amp A - accepts common-mode voltages from –0.3V to V+ +0.3V. |
| 4 | V– | Negative supply rail - connects to ground in single-supply configurations; must be bypassed with 0.01µF ceramic capacitor. |
| 5 | +In B | Non-inverting input of Amp B - electrically isolated from other channels; no crosstalk. |
| 6 | –In B | Inverting input of Amp B - matched offset and bias characteristics to Amp A for differential pair use. |
| 7 | Out B | Amplifier B output - identical AC/DC specs to Out A; supports independent signal paths. |
| 8 | V+ | Positive supply rail - operates from 2.5V to 5.5V; PSRR ≥74dB up to 100kHz. |
| 9 | Out C | Amplifier C output - fully independent; enables 4-channel simultaneous sampling or multi-stage filtering. |
| 10 | –In C | Inverting input of Amp C - same input voltage range and impedance as pins 2 and 6. |
| 11 | +In C | Non-inverting input of Amp C - supports rail-to-rail input even at 2.7V supply. |
| 12 | V– | Shared negative rail - all four amplifiers reference same V–; requires low-impedance grounding. |
| 13 | +In D | Non-inverting input of Amp D - enables fourth independent channel for quad-sensor interfaces. |
| 14 | –In D | Inverting input of Amp D - matched performance to other inputs; supports precision differential measurement. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input and output | Enables full-scale signal utilization in 3.3V systems - e.g., 0–3.3V ADC input drive with <10mV headroom loss. |
| Low quiescent current (850µA/chan) | Permits four-channel operation at <3.4mA total - extends battery life in portable DAQ and handheld test equipment. |
| Ultra-low input bias current (0.2pA typ) | Reduces voltage error to <1µV in 10MΩ source impedance circuits - essential for electrochemical and piezoelectric sensors. |
| High channel separation (>100dB) | Prevents signal leakage between channels in multi-signal acquisition - critical for simultaneous analog front-end sampling. |
| Specified from –40°C to +85°C | Guarantees consistent offset, bandwidth, and noise performance across industrial temperature range without derating. |
Applications
| Driving A/D Converters | PCMCIA Data Acquisition |
|---|---|
Use Scenario: Buffering and gain-setting stage before a 12-bit sampling ADC (e.g., ADS7816) in a portable data logger. IC Role / Device Role / Timing Role: OPA4343UA/2K5 provides low-noise, rail-to-rail input/output signal conditioning with fast settling (1µs to 0.1%) to prevent conversion errors from charge injection. Use Value: Eliminates need for external level-shifting; maintains THD+N <0.001% at 1kHz while operating from 3.3V supply. | Use Scenario: Signal conditioning for four independent analog inputs on a PCMCIA card used in field-deployable environmental monitoring. IC Role / Device Role / Timing Role: OPA4343UA/2K5 serves as quad-channel front-end amplifier - each channel independently buffers thermistor, humidity, pressure, and gas sensor outputs. Use Value: Independent circuitry ensures <–100dB channel separation; 850µA/channel current enables full-card operation within 100mA PCMCIA power budget. |
| Active Audio Filters | Test Equipment Signal Paths |
Use Scenario: 2nd-order Sallen-Key low-pass filter in a battery-powered audio analyzer targeting 20Hz–20kHz bandwidth. IC Role / Device Role / Timing Role: OPA4343UA/2K5 implements dual-filter sections (LPF + HPF) with rail-to-rail output swing preserving full dynamic range at 3.3V. Use Value: 5.5MHz GBW ensures flat frequency response to 20kHz; 0.0007% THD+N prevents audible distortion in critical listening applications. | Use Scenario: Precision voltage follower and gain stage in automated test equipment (ATE) switching matrix for calibrating multimeters and oscilloscopes. IC Role / Device Role / Timing Role: OPA4343UA/2K5 acts as low-drift, low-noise buffer isolating DUT from switching transients while maintaining DC accuracy. Use Value: ±2mV max offset and 0.2pA input bias enable µV-level DC measurements; 6V/µs slew rate handles fast calibration pulses without overshoot. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad rail-to-rail op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA4340UA/2K5 | Higher precision: ±0.5mV max offset, 0.1µV/°C drift; lower GBW (1MHz); higher IQ (1.2mA/chan) | Better for DC-critical applications (e.g., strain gauge bridges); unsuitable for >1MHz signal buffering | Select OPA4340UA/2K5 when offset drift and long-term stability outweigh speed/power needs. |
| TLV2464CDR | Lower cost; 6.4MHz GBW; 1.5mA/chan IQ; ±3mV offset; not specified below –40°C | Acceptable for commercial-temp consumer devices; lacks guaranteed performance over full industrial range | Choose TLV2464CDR only for cost-sensitive, non-industrial designs where 85°C upper limit is sufficient. |
Compared with OPA4343UA/2K5, OPA4340UA/2K5 trades bandwidth and power efficiency for superior DC accuracy, while TLV2464CDR offers marginal speed gain at higher quiescent current and reduced temperature coverage - making OPA4343UA/2K5 the balanced choice for industrial data acquisition requiring both speed and low-power rail-to-rail operation.
Availability
OPA4343UA/2K5 is available at Aetrix Electronics and suitable for data acquisition, portable instrumentation, and sensor interface applications requiring stable component supply, consistent parametric performance across temperature, and long-term manufacturing continuity.
Supply support for OPA4343UA/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 amps and signal chain solutions.
The OPA4343UA/2K5 belongs to TI's microAmplifier™ series - designed specifically for miniature, low-voltage, single-supply applications demanding rail-to-rail I/O, low power, and high-speed performance in space-constrained systems.
FAQ
What supply voltage range does the OPA4343UA/2K5 support?
The OPA4343UA/2K5 operates from a single supply of 2.5V to 5.5V, with full specifications guaranteed from 2.7V to 5.5V across –40°C to +85°C. This allows reliable use in 3.3V and 5V systems, including battery-powered devices where voltage may sag below nominal levels. The OPA4343UA/2K5 maintains rail-to-rail input/output functionality across this entire range.
Does the OPA4343UA/2K5 require external compensation for unity-gain stability?
No, the OPA4343UA/2K5 is internally compensated and unity-gain stable. It can be used directly in voltage-follower, non-inverting, or inverting configurations without added phase-compensation components. Stability is maintained with capacitive loads up to 1000pF in unity-gain mode, though a 10Ω–20Ω series resistor at the output is recommended for loads >100pF to minimize ringing.
How does the rail-to-rail input stage of the OPA4343UA/2K5 function?
The OPA4343UA/2K5 uses a complementary CMOS input stage - parallel N-channel and P-channel differential pairs - enabling input common-mode voltage from –0.3V to V+ + 0.3V. Within a ~400mV transition region near V+ – 1.3V, both pairs operate simultaneously, causing slight degradation in PSRR, CMRR, and THD; outside this region, performance meets full specifications.
What is the maximum capacitive load the OPA4343UA/2K5 can drive reliably?
The OPA4343UA/2K5 drives up to 1000pF in unity-gain configuration while maintaining stability and low overshoot. For heavier loads, adding a 10Ω–20Ω series resistor at the output isolates the amplifier from the capacitance, improving phase margin. Performance curves confirm <5% overshoot with 1000pF load and <1% with 100pF - critical for driving ADC input capacitance without settling errors.
Is the OPA4343UA/2K5 pin-compatible with other packages in the OPA343 family?
No - the OPA4343UA/2K5 uses a 14-pin SOIC package (drawing D), while the quad OPA4343EA/2K5 uses 16-pin SSOP (DBQ) and OPA4343NA/2K5 uses 14-pin TSSOP (PW). Pinouts differ across packages; the SOIC variant has shared V– on pins 4 and 12, whereas SSOP places V– only on pin 4. PCB layout must match the specific package ordering suffix.
OPA4343UA/2K5 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- MicroAmplifier™
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- CMOS
- Number of Circuits:
- 4
- 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 (x4 Channels)
- 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:
- 14-SOIC
OPA4343UA/2K5 FAQ
1.How can I place an order for OPA4343UA/2K5 through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA4343UA/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 OPA4343UA/2K5 reliable?
The price and inventory of OPA4343UA/2K5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA4343UA/2K5 is usually 5 days.
3.What payment methods are accepted for OPA4343UA/2K5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA4343UA/2K5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA4343UA/2K5?
OPA4343UA/2K5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA4343UA/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 OPA4343UA/2K5?
For technical support, including OPA4343UA/2K5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA4343UA/2K5 requirements.
6.How does Aetrix verify that OPA4343UA/2K5 is sourced from the original manufacturer or authorized distributors?
All OPA4343UA/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 OPA4343UA/2K5 meets industry standards.
7.What is the process for return or replacement of OPA4343UA/2K5?
All OPA4343UA/2K5 units undergo pre-shipment inspection (PSI). If there is an issue with OPA4343UA/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 OPA4343UA/2K5 part is unused and in its original packaging.
Return procedure for OPA4343UA/2K5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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