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Texas Instruments OPA343NA/3KG4
- Part No.:
- OPA343NA/3KG4
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SC-74A, SOT-753
- Datasheet:
-
OPA343NA/3KG4.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,776
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Product details
Overview
OPA343NA/3KG4 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 systems.
For engineers reviewing the OPA343NA/3KG4 datasheet, OPA343NA/3KG4 pinout, OPA343NA/3KG4 application, or OPA343NA/3KG4 equivalent, key selection criteria include rail-to-rail I/O performance at 2.5V supply, ultra-low input bias current (±0.2pA typ), THD+N of 0.0007% at 1kHz, and SOT-23-5 package compatibility with high-density PCB layouts.
Technical Context
The OPA343NA/3KG4 employs a complementary N/P-channel input stage enabling rail-to-rail common-mode input range extending 500mV beyond supply rails. Its class AB output stage supports true rail-to-rail output swing with <5mV headroom into 100kΩ, maintaining ≥100dB open-loop gain across temperature and supply variations.
Designed on a 0.6µm CMOS process, it achieves unity-gain stability while driving capacitive loads up to 1000pF. Input voltage noise is 25nV/√Hz at 1kHz, and input offset voltage is ±2mV (max ±8mV) over –40°C to +85°C - critical for precision signal conditioning in low-power data acquisition.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.5V to 5.5V - enables direct interface with 3.3V and 2.5V logic, eliminating level-shifting circuitry |
| Gain-Bandwidth Product | 5.5MHz - supports stable closed-loop gain up to 100× at 55kHz for anti-aliasing filter design |
| Slew Rate | 6V/µs - ensures <1µs settling to 0.1% for 2V step, suitable for 100kHz sampling ADC drivers |
| Input Bias Current | ±0.2pA (typ) - minimizes voltage error in high-impedance sensor interfaces (e.g., photodiode transimpedance) |
| THD+N | 0.0007% at 1kHz - preserves audio fidelity and measurement accuracy in analog front-ends |
| Quiescent Current | 0.85mA per amplifier - extends battery life in portable instrumentation and IoT edge nodes |
| Input Offset Voltage | ±2mV (max ±8mV) - maintains DC accuracy in uncalibrated 12-bit data acquisition systems |
Pinout & Package
SOT-23-5 surface-mount package (DBV drawing), 2.9mm × 1.6mm footprint, 1.0mm height, moisture sensitivity level (MSL) 1 - suitable for reflow soldering without dry-pack requirements.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUT) | Amplifier output | Delivers rail-to-rail voltage swing; drives 100kΩ load to within 1mV of V+ or V– |
| 2 (–IN) | Inverting input | High-impedance node (10¹³Ω || 6pF); accepts signals from –0.3V to (V+) + 0.3V |
| 3 (+IN) | Non-inverting input | Same common-mode range as –IN; enables true single-supply sensor buffering |
| 4 (V–) | Negative supply | Ground reference for single-supply operation; must be bypassed with 0.01µF ceramic capacitor |
| 5 (V+) | Positive supply | Accepts 2.5V–5.5V; PSRR >40µV/V ensures immunity to supply ripple in noisy environments |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input and output | Enables full dynamic range utilization in 2.5V systems - e.g., 0–2.5V signal chain without headroom loss |
| Ultra-low input bias current | ±0.2pA typical allows direct connection to high-Z sources (e.g., pH electrodes, piezoelectric sensors) without guard traces |
| Low THD+N (0.0007%) | Maintains signal integrity in audio processing and precision DAC output buffers where harmonic distortion degrades SNR |
| Unity-gain stable | Eliminates need for external compensation in voltage-follower configurations used for impedance isolation |
| Wide temperature range | Specified from –40°C to +85°C; operates continuously from –55°C to +125°C - suitable for industrial control enclosures |
Applications
| Driving A/D Converters | PCMCIA Cards |
|---|---|
Use Scenario: Buffering and driving the input capacitance of 12-bit sampling ADCs like ADS7816 in portable data loggers. IC Role / Device Role / Timing Role: High-speed voltage follower providing charge injection immunity and fast settling (<1µs to 0.1%) before sample-and-hold. Use Value: Prevents missing codes and integral nonlinearity errors caused by op-amp settling delay in medium-speed (≤100kHz) conversion cycles. | Use Scenario: Signal conditioning in PCMCIA peripheral cards requiring compact, low-power analog front-ends. IC Role / Device Role / Timing Role: Single-supply amplifier for sensor interface or audio line-level amplification within tight card-edge constraints. Use Value: SOT-23-5 footprint saves board area vs SO-8; 850µA IQ extends host system battery life during card standby. |
| Data Acquisition | Audio Processing |
Use Scenario: Front-end amplification for multi-channel industrial DAQ modules measuring thermocouples or strain gauges. IC Role / Device Role / Timing Role: Precision buffer with rail-to-rail I/O enabling full-scale use of 16-bit ADC input range from 0V to VREF. Use Value: ±2mV offset and 25nV/√Hz noise preserve resolution in sub-10µV measurement applications. | Use Scenario: Line driver and active filter stage in portable audio codecs and headset amplifiers. IC Role / Device Role / Timing Role: Low-distortion gain stage (G=1 to 10) with bandwidth sufficient for 20kHz audio passband. Use Value: 0.0007% THD+N at 1kHz ensures >100dB SFDR, meeting consumer audio SNR requirements without post-processing. |
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, 0.00008% THD+N; 1.8MHz GBW; 500µA IQ | Better suited for high-accuracy 16-bit+ data acquisition where offset drift dominates error budget | Select OPA340UA when DC accuracy and ultra-low distortion outweigh bandwidth needs |
| MCP6001T-E/OT | Lower cost; 1MHz GBW; 1V/µs slew rate; 100µA IQ; rail-to-rail I/O but 10mV output swing min | Targeted at cost-sensitive, low-speed applications (e.g., simple sensor biasing) where speed and noise are secondary | Choose MCP6001T-E/OT only if bandwidth <1MHz and THD+N >0.01% are acceptable |
Compared with OPA343NA/3KG4, OPA340UA offers superior DC precision and audio performance at reduced bandwidth, while MCP6001T-E/OT trades speed and noise for ultra-low power and cost - making OPA343NA/3KG4 the optimal balance for 5.5MHz, low-noise, rail-to-rail signal conditioning in space-constrained designs.
Availability
OPA343NA/3KG4 is available at Aetrix Electronics and suitable for data acquisition, portable instrumentation, and audio signal conditioning requiring stable component supply and long-term manufacturability.
Supply support for OPA343NA/3KG4 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, single-supply applications demanding rail-to-rail performance, low power, and high-speed operation in portable and space-constrained systems.
FAQ
What is the maximum operating supply voltage for OPA343NA/3KG4?
The OPA343NA/3KG4 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 parametric guarantees; for reliable performance across temperature, TI specifies parameters only within 2.7V–5.0V at –40°C to +85°C. The OPA343NA/3KG4 remains functional up to 5.5V with degraded PSRR and increased quiescent current.
Does OPA343NA/3KG4 support rail-to-rail input at 2.5V supply?
Yes, the OPA343NA/3KG4 supports rail-to-rail input with common-mode voltage range from –0.3V to (V+) + 0.3V - meaning at 2.5V supply, inputs can swing from –0.3V to +2.8V. This is enabled by its complementary N/P-channel input stage. The OPA343NA/3KG4 maintains CMRR ≥74dB across this range, ensuring accurate signal capture even near supply rails.
Can OPA343NA/3KG4 drive a 600Ω load?
Yes, the OPA343NA/3KG4 class AB output stage is explicitly rated to drive 600Ω loads connected between V+ and ground. Output voltage swing remains within 40mV of rails at ±20mA output current (per datasheet Figure "Output Voltage Swing vs Output Current"). For sustained 600Ω operation, thermal considerations require limiting ambient temperature to ≤85°C due to θJA = 200°C/W in SOT-23-5.
What is the recommended bypassing for OPA343NA/3KG4 power pins?
Texas Instruments recommends bypassing both V+ and V– pins of the OPA343NA/3KG4 with 0.01µF ceramic capacitors placed as close as possible to the device. These capacitors suppress high-frequency supply noise and prevent oscillation, especially critical given the OPA343NA/3KG4's 5.5MHz bandwidth and unity-gain stability. Larger bulk capacitance (e.g., 1µF) may be added in parallel for low-frequency ripple suppression.
Is OPA343NA/3KG4 pin-compatible with other OPA343 variants?
Yes, all OPA343 variants - including OPA343NA/3KG4 (SOT-23-5), OPA343UA (SO-8), and OPA343NA/250 - share identical pinout and electrical specifications. The SOT-23-5 version uses pins 1–5 for OUT, –IN, +IN, V–, V+, matching the SO-8 variant's pin 1–5 mapping. This allows drop-in replacement in existing designs when board space or thermal requirements dictate package change.
OPA343NA/3KG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- MicroAmplifier™
- Package/Case:
- SC-74A, SOT-753
- 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:
- SOT-23-5
OPA343NA/3KG4 FAQ
1.How can I place an order for OPA343NA/3KG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA343NA/3KG4 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/3KG4 reliable?
The price and inventory of OPA343NA/3KG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA343NA/3KG4 is usually 5 days.
3.What payment methods are accepted for OPA343NA/3KG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA343NA/3KG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA343NA/3KG4?
OPA343NA/3KG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA343NA/3KG4 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/3KG4?
For technical support, including OPA343NA/3KG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA343NA/3KG4 requirements.
6.How does Aetrix verify that OPA343NA/3KG4 is sourced from the original manufacturer or authorized distributors?
All OPA343NA/3KG4 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/3KG4 meets industry standards.
7.What is the process for return or replacement of OPA343NA/3KG4?
All OPA343NA/3KG4 units undergo pre-shipment inspection (PSI). If there is an issue with OPA343NA/3KG4, 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/3KG4 part is unused and in its original packaging.
Return procedure for OPA343NA/3KG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
OPA343NA/3KG4 Tags
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