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Texas Instruments OPA349NA/3K
- Part No.:
- OPA349NA/3K
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SC-74A, SOT-753
- Datasheet:
-
OPA349NA/3K.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:5,692
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Product details
Overview
OPA349NA/3K from Texas Instruments is a single-channel, rail-to-rail input/output CMOS operational amplifier optimized for ultra-low-power battery-operated systems. It delivers 70kHz gain-bandwidth, 1µA quiescent current, 90dB open-loop gain, and operates from 1.8V to 5.5V supply - enabling precision signal conditioning in smoke detectors and portable medical sensors.
For engineers reviewing the OPA349NA/3K datasheet, OPA349NA/3K pinout, OPA349NA/3K application, or OPA349NA/3K equivalent, key selection criteria include micropower operation under 1µA, rail-to-rail I/O swing within 350mV of rails, unity-gain stability without external compensation, and SOT23-5 package compatibility with high-density PCB layouts.
Technical Context
The OPA349NA/3K employs a complementary differential input stage (N- and P-channel pairs) enabling 200mV beyond-rail common-mode input range and consistent performance across 1.8V–5.5V supplies. Its fully differential architecture supports stable unity-gain configuration without phase-compensation networks.
Internal biasing maintains 1µA quiescent current across temperature (0°C to +70°C), while output drive capability of ±8mA into 10kΩ loads ensures robust interfacing with ADC drivers and low-power filters - critical for solar-powered remote sensors and PCMCIA card analog front-ends.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.8V to 5.5V - enables direct interface with Li-ion, alkaline, and coin-cell batteries without regulation. |
| Quiescent Current | 1µA (typ) - extends battery life in always-on smoke detection and wearable health monitors. |
| Gain-Bandwidth Product | 70kHz - sufficient for DC-coupled sensor amplification and anti-aliasing filter stages. |
| Input Bias Current | 10pA (max) - permits use of >10MΩ feedback/source resistors without significant offset error. |
| Output Swing | Within 350mV of rails at 10kΩ load - preserves dynamic range in single-supply 3.3V or 5V systems. |
| Open-Loop Gain | 90dB - ensures <0.1% gain error in precision instrumentation amplifier configurations. |
| Input Common-Mode Range | (V−) − 0.2V to (V+) + 0.2V - supports direct sensing of signals below ground or above V+ in industrial transducers. |
Pinout & Package
SOT23-5 surface-mount package (DBV), 1.6mm × 2.9mm footprint, 1.1mm max height, moisture sensitivity level 2-260°C-1 year.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - V+ | Positive supply rail | Accepts 1.8V–5.5V; requires local 0.01µF ceramic bypass to minimize noise coupling. |
| 2 - −In | Inverting input | Differential node for feedback networks; high-impedance (10¹³Ω || 4pF) minimizes loading on high-Z sources. |
| 3 - Out | Amplifier output | Drives up to ±8mA; rail-to-rail swing enables full-scale ADC utilization without level-shifting. |
| 4 - V− | Negative supply rail / ground reference | Supports single-supply operation; output can swing to within 350mV of this rail. |
| 5 - +In | Non-inverting input | High-impedance input for sensor biasing or reference voltage buffering in low-power data acquisition. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input range | Extends 200mV beyond supply rails - eliminates need for level-shifting in single-supply sensor interfaces. |
| Unity-gain stability | No external compensation required - simplifies layout and reduces BOM count in buffer and gain-stage designs. |
| Ultra-low input bias current | ≤10pA (max) - enables accurate amplification of signals from high-impedance pH electrodes or piezoelectric sensors. |
| Wide supply voltage range | 1.8V to 5.5V - accommodates aging battery discharge curves without performance degradation. |
| Low input voltage noise | 300nV/√Hz at 1kHz - preserves SNR in low-level thermistor or strain gauge signal chains. |
Applications
| Battery-Powered Smoke Detection | Portable Medical Sensor Interface |
|---|---|
Use Scenario: Continuous monitoring of ionization chamber current in battery-backed residential smoke alarms. IC Role / Device Role / Timing Role: Precision current-to-voltage converter and low-pass filter driver for ADC sampling. Use Value: 1µA quiescent current extends 10-year battery life; rail-to-rail output maximizes 12-bit ADC resolution. |
Use Scenario: Amplifying microvolt-level ECG or pulse oximetry signals in wearable patches. IC Role / Device Role / Timing Role: First-stage instrumentation amplifier with high CMRR and low noise. Use Value: 10pA input bias avoids electrode polarization errors; 70kHz GBW supports 100Hz physiological bandwidth. |
| Solar-Powered Remote Environmental Sensor | PCMCIA Card Analog Front-End |
Use Scenario: Signal conditioning for temperature/humidity sensors powered by intermittent solar harvesting. IC Role / Device Role / Timing Role: Low-power sensor excitation and buffered output driver for SPI ADC. Use Value: Operation down to 1.8V ensures functionality during low-light battery recovery; SOT23-5 footprint saves board space. |
Use Scenario: Analog signal routing and level adaptation in legacy PCMCIA data acquisition cards. IC Role / Device Role / Timing Role: Rail-to-rail buffer isolating ADC inputs from noisy host bus signals. Use Value: 90dB open-loop gain ensures <0.01% gain drift over temperature; SC70/SOT23-5 variants support ultra-thin card profiles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar micropower rail-to-rail op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV2401IDBVR | 5.5kHz GBW, 1µA IQ, same SOT23-5 package but lower bandwidth and higher input offset (±1.5mV vs ±2mV typ). | Best suited for DC-coupled, low-frequency sensor buffers where bandwidth is secondary to cost. | Select TLV2401IDBVR only when <10kHz signal content suffices and offset budget allows ±1.5mV. |
| OPA347UA/2K5 | 350kHz GBW, 20µA IQ, SO-8 package - higher speed and power, not pin-compatible with OPA349NA/3K. | Applicable in higher-speed micropower filters or active anti-aliasing stages requiring >100kHz response. | Choose OPA347UA/2K5 only when system demands >10× bandwidth and layout allows SO-8 footprint. |
Compared with TLV2401IDBVR and OPA347UA/2K5, the OPA349NA/3K uniquely balances 70kHz bandwidth, 1µA quiescent current, and SOT23-5 compatibility - making it optimal for space-constrained, long-life battery systems where moderate speed and ultra-low power are co-required.
Availability
OPA349NA/3K is available at Aetrix Electronics and suitable for battery packs, smoke/fire detection systems, and portable medical devices requiring stable component supply with guaranteed long-term manufacturability.
Supply support for OPA349NA/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 low-power signal chain solutions.
The OPA349 series belongs to TI's micropower operational amplifier product line, engineered specifically for battery-powered instrumentation, portable safety systems, and energy-harvesting sensor nodes where sub-µA quiescent current and rail-to-rail performance are mandatory.
FAQ
What is the operating temperature range for the OPA349NA/3K?
The OPA349NA/3K is specified for 0°C to +70°C ambient operation, with extended functionality up to +85°C. Its quiescent current remains stable at 1µA across this range, and electrical parameters such as input offset voltage and open-loop gain are guaranteed per the SBOS121B datasheet. This makes the OPA349NA/3K suitable for indoor consumer and industrial environments where thermal extremes are limited.
Is the OPA349NA/3K unity-gain stable without external compensation?
Yes, the OPA349NA/3K is explicitly designed for unity-gain stability and requires no external compensation components. Its internal compensation ensures phase margin >45° at unity gain across all supply voltages (1.8V–5.5V) and load conditions up to 100pF. This eliminates the need for feedback capacitors in buffer configurations, reducing design complexity and PCB area - a key advantage over many competing micropower op amps.
What package type does the OPA349NA/3K use, and what are its key mechanical dimensions?
The OPA349NA/3K uses the SOT23-5 (DBV) package: 1.6mm × 2.9mm body size, 1.1mm maximum height, and 0.95mm pitch between pins. Pin 1 is located in quadrant Q3 per tape-and-reel orientation standards. The package features gull-wing leads compatible with standard reflow profiles (MSL Level-2, peak 260°C), and its compact footprint supports high-density layouts in space-constrained applications like wearable sensors and PCMCIA cards.
Can the OPA349NA/3K drive ADC inputs directly?
Yes, the OPA349NA/3K is frequently used to drive SAR and delta-sigma ADC inputs due to its rail-to-rail output swing (within 350mV of rails at 10kΩ), low output impedance, and 70kHz bandwidth - sufficient for settling 12-bit conversions in ≤10µs. Its 10pA input bias current prevents loading of high-impedance ADC sample-and-hold networks, and its 1µA quiescent current aligns with ultra-low-power data acquisition requirements.
How does the rail-to-rail input stage of the OPA349NA/3K function, and what design considerations apply?
The OPA349NA/3K uses parallel N- and P-channel input differential pairs to achieve rail-to-rail input range extending 200mV beyond both supply rails. Within the ~400mV transition region near (V+) − 1.3V, CMRR and PSRR degrade slightly. To avoid this, designers should bias the common-mode input outside that zone - e.g., using a resistor divider to set +In at V+/2 - ensuring optimal precision in applications like thermistor bridges or current-sense amplifiers.
OPA349NA/3K Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- 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:
- 0.02V/µs
- Gain Bandwidth Product:
- 70 kHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 0.5 pA
- Voltage - Input Offset:
- 2 mV
- Current - Supply:
- 1µA
- Current - Output / Channel:
- 8 mA
- Voltage - Supply Span (Min):
- 1.8 V
- Voltage - Supply Span (Max):
- 5.5 V
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
OPA349NA/3K FAQ
1.How can I place an order for OPA349NA/3K through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA349NA/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 OPA349NA/3K reliable?
The price and inventory of OPA349NA/3K are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA349NA/3K is usually 5 days.
3.What payment methods are accepted for OPA349NA/3K?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA349NA/3K transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA349NA/3K?
OPA349NA/3K orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA349NA/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 OPA349NA/3K?
For technical support, including OPA349NA/3K datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA349NA/3K requirements.
6.How does Aetrix verify that OPA349NA/3K is sourced from the original manufacturer or authorized distributors?
All OPA349NA/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 OPA349NA/3K meets industry standards.
7.What is the process for return or replacement of OPA349NA/3K?
All OPA349NA/3K units undergo pre-shipment inspection (PSI). If there is an issue with OPA349NA/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 OPA349NA/3K part is unused and in its original packaging.
Return procedure for OPA349NA/3K:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
OPA349NA/3K Tags
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