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Texas Instruments OPA345NA/3K
- Part No.:
- OPA345NA/3K
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SC-74A, SOT-753
- Datasheet:
-
OPA345NA/3K.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,484
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Product details
Overview
OPA345NA/3K from Texas Instruments is a single, rail-to-rail input/output CMOS operational amplifier optimized for gains ≥5 and high-precision, low-power, single-supply applications. It delivers 3MHz gain-bandwidth, 2V/µs slew rate, 150µA typical quiescent current, <1mV output swing from rail (RL = 100kΩ), and 0.006% THD+N at 1kHz - enabling high-fidelity signal conditioning in space-constrained data acquisition and audio front-ends.
For engineers reviewing the OPA345NA/3K datasheet, OPA345NA/3K pinout, OPA345NA/3K application, or OPA345NA/3K equivalent, key selection criteria include its minimum stable gain of 5, SOT23-5 package footprint, –40°C to +85°C temperature rating, rail-to-rail operation down to 2.5V supply, and compatibility with sampling ADC drivers requiring fast settling and low distortion.
Technical Context
The OPA345NA/3K employs a complementary differential input stage enabling rail-to-rail common-mode range (–0.3V to V+ + 0.3V) and a class AB output stage delivering 1mV rail-to-rail swing under light loads. Its internal compensation ensures stability only at gains ≥5, distinguishing it from the unity-gain-stable OPA344.
It operates from 2.5V to 5.5V single supply, draws ≤250µA quiescent current over temperature, and maintains >96dB open-loop gain (RL = 100kΩ) across –40°C to +85°C - making it suitable for battery-powered instrumentation where dynamic range and power efficiency are co-constrained.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-Bandwidth Product | 3MHz - supports closed-loop bandwidth up to ~600kHz at G = 5, sufficient for 12-bit ADC buffering and anti-alias filtering. |
| Slew Rate | 2V/µs - enables full-scale 2V output step settling in ≤1.6µs (0.01%), critical for driving sampling ADC inputs without distortion. |
| Input Offset Voltage | ±1mV max (–40°C to +85°C) - ensures ≤1LSB error when interfacing with 12-bit ADCs referenced to 5V full scale. |
| THD + Noise | 0.006% at 1kHz, G = 5 - preserves signal fidelity in audio pre-amplification and sensor signal chains requiring low harmonic contamination. |
| Quiescent Current | 150µA typ / 250µA max - allows continuous operation in micro-power systems (e.g., portable data loggers) with multi-year battery life. |
| Rail-to-Rail Output Swing | 1mV from rail (RL = 100kΩ) - maximizes usable dynamic range in low-voltage (2.7V–5.5V) single-supply systems. |
| Common-Mode Range | –0.3V to V+ + 0.3V - accepts input signals extending beyond supply rails, simplifying level-shifting in mixed-signal interfaces. |
Pinout & Package
SOT23-5 surface-mount package (DBV drawing), 5-pin, moisture sensitivity level 2, RoHS-compliant, thermal resistance θJA = 200°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - V– | Negative supply / ground reference | Connect to system ground or negative rail; supports single-supply operation from 2.5V. |
| 2 - –In | Inverting input | Differential input node; high-impedance CMOS input (1013Ω || 6pF) minimizes loading on sensor sources. |
| 3 - Out | Amplifier output | Capable of sourcing/sinking ±15mA; drives 600Ω loads while maintaining rail-to-rail swing. |
| 4 - +In | Non-inverting input | Differential input node; shares same rail-to-rail common-mode range as –In (–0.3V to V+ + 0.3V). |
| 5 - V+ | Positive supply | Accepts 2.5V to 5.5V; bypass with 0.01µF ceramic capacitor to ground for stability. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input and output | Enables full utilization of supply voltage headroom in 2.7V–5.5V systems, increasing effective ADC resolution by up to 1.5 bits. |
| Optimized for G ≥ 5 | Internally compensated for minimum gain of 5 - prevents oscillation in non-inverting amplifier configurations with gain-setting resistors. |
| Low 150µA quiescent current | Reduces self-heating and extends battery life in always-on sensor nodes without sacrificing AC performance (3MHz GBW, 2V/µs SR). |
| 0.006% THD+N at 1kHz | Meets audio-grade signal integrity requirements for microphone preamps and communication channel conditioning. |
| –40°C to +85°C operation | Qualified for industrial environments; parameters guaranteed across full range, including offset drift (±3µV/°C) and PSRR (≥30µV/V). |
Applications
| PCMCIA Cards | Data Acquisition |
|---|---|
Use Scenario: Signal conditioning in compact PCMCIA-based measurement cards for field-deployable test equipment. IC Role / Device Role: Single-supply buffer and gain stage preceding 12-bit SAR ADCs (e.g., ADS7822), rejecting supply noise and preserving small-signal integrity. Use Value: Rail-to-rail I/O and 2V/µs slew rate enable accurate capture of fast transients within tight 5V supply constraints and minimal board area (SOT23-5). | Use Scenario: Front-end amplification in portable data loggers acquiring thermocouple, strain gauge, or pH sensor outputs. IC Role / Device Role: Precision, low-power instrumentation amplifier driver with programmable gain ≥5, interfacing to sigma-delta or SAR ADCs. Use Value: ±1mV max offset and 0.006% THD+N ensure <12-bit linearity; 150µA IQ supports multi-year coin-cell operation. |
| Audio Processing | Active Filters |
Use Scenario: Low-noise preamplification of electret microphone outputs in voice-enabled IoT edge devices. IC Role / Device Role: High-input-impedance, low-distortion gain block in bandpass-filtered speech acquisition circuits (300Hz–3kHz). Use Value: 30nV/√Hz input voltage noise and rail-to-rail swing preserve SNR across 2.7V–5V supply variations; SOT23-5 eases integration into space-limited modules. | Use Scenario: Second-order active filter stages in battery-powered medical sensors (e.g., ECG front-ends) requiring precise cutoff and phase response. IC Role / Device Role: Gain-setting and buffering element in MFB or Sallen-Key topologies operating at G = 5–10. Use Value: 3MHz GBW supports filter corner frequencies up to ~300kHz; internal gain ≥5 compensation eliminates need for external compensation components. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision, low-power, rail-to-rail op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA344NA/3K | Unity-gain stable; 1MHz GBW; 0.8V/µs slew rate; identical SOT23-5 package and pinout. | Preferred for G = 1 buffers, voltage followers, or low-bandwidth sensor interfaces where stability at unity gain is required. | Select OPA344NA/3K only when gain < 5 is needed; not a drop-in replacement due to different compensation. |
| MCP6001T-E/OT | Unity-gain stable; 1MHz GBW; 0.6V/µs SR; 100µA IQ; SOT23-5; rail-to-rail I/O; 1.8V–6.0V supply. | Better suited for ultra-low-voltage (1.8V) or cost-sensitive consumer applications; lower drive capability (±8mA). | Choose MCP6001T-E/OT for sub-2.5V operation or tighter budget constraints; verify stability with capacitive loads. |
Compared with OPA344NA/3K and MCP6001T-E/OT, the OPA345NA/3K uniquely balances higher speed (3MHz, 2V/µs) and precision (0.006% THD+N) at minimal quiescent current (150µA) - making it optimal for gain ≥5 signal chains where bandwidth and fidelity outweigh unity-gain flexibility.
Availability
OPA345NA/3K is available at Aetrix Electronics and suitable for data acquisition, portable instrumentation, audio front-ends, and active filter designs requiring stable component supply, consistent parametric performance, and long-term industrial availability.
Supply support for OPA345NA/3K 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 OPA345NA/3K belongs to TI's MicroAmplifier™ series, designed specifically for miniature, low-power, single-supply applications demanding rail-to-rail performance, high accuracy, and robust operation across industrial temperature ranges.
FAQ
What is the minimum stable gain for the OPA345NA/3K?
The OPA345NA/3K is internally compensated for minimum closed-loop gain of 5. It is not unity-gain stable; using it at G < 5 may cause instability or ringing. For unity-gain applications, the pin-compatible OPA344NA/3K is recommended. This gain constraint is explicitly defined in the datasheet's frequency response and stability sections.
Does the OPA345NA/3K support true rail-to-rail input and output?
Yes, the OPA345NA/3K provides rail-to-rail input common-mode range (–0.3V to V+ + 0.3V) and rail-to-rail output swing (within 1mV of either rail with RL = 100kΩ). This is achieved via complementary input pairs and a class AB output stage, enabling full dynamic range utilization in 2.5V–5.5V single-supply systems.
What package type and marking does the OPA345NA/3K use?
The OPA345NA/3K is supplied in the SOT23-5 surface-mount package (TI package drawing DBV) with device marking "A45". It ships in tape-and-reel format with 3,000 units per reel, moisture sensitivity level 2, and RoHS-compliant lead finish (NiPdAu).
Can the OPA345NA/3K drive capacitive loads directly?
The OPA345NA/3K can directly drive up to 250pF of pure capacitive load when configured for gain ≥5. At unity gain, it requires external compensation (e.g., a 10Ω–20Ω series resistor at the output) to maintain stability. This behavior is confirmed in the "Capacitive Load and Stability" section of the SBOS107A datasheet.
What is the maximum supply voltage and absolute input voltage range for the OPA345NA/3K?
The OPA345NA/3K has a specified supply voltage range of 2.7V to 5.5V, with functional operation supported from 2.5V to 5.5V. Absolute maximum supply is 7.5V. Input terminals tolerate voltages from (V–) –0.5V to (V+) +0.5V, but sustained input beyond (V–) –0.3V risks output lockup - requiring Schottky clamping per Figure 4 in the datasheet.
OPA345NA/3K Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- MicroAmplifier™
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 1
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 2V/µs
- Gain Bandwidth Product:
- 3 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 0.2 pA
- Voltage - Input Offset:
- 200 µV
- Current - Supply:
- 150µA
- Current - Output / Channel:
- 15 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
OPA345NA/3K FAQ
1.How can I place an order for OPA345NA/3K through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA345NA/3K 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 OPA345NA/3K reliable?
The price and inventory of OPA345NA/3K are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA345NA/3K is usually 5 days.
3.What payment methods are accepted for OPA345NA/3K?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA345NA/3K transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA345NA/3K?
OPA345NA/3K orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA345NA/3K 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 OPA345NA/3K?
For technical support, including OPA345NA/3K datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA345NA/3K requirements.
6.How does Aetrix verify that OPA345NA/3K is sourced from the original manufacturer or authorized distributors?
All OPA345NA/3K 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 OPA345NA/3K meets industry standards.
7.What is the process for return or replacement of OPA345NA/3K?
All OPA345NA/3K units undergo pre-shipment inspection (PSI). If there is an issue with OPA345NA/3K, 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 OPA345NA/3K part is unused and in its original packaging.
Return procedure for OPA345NA/3K:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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