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Texas Instruments OPA349NA/250
- Part No.:
- OPA349NA/250
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SC-74A, SOT-753
- Datasheet:
-
OPA349NA/250.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,289
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Product details
Overview
OPA349NA/250 from Texas Instruments is a single ultra-low-power rail-to-rail input/output CMOS operational amplifier designed for battery-powered signal conditioning. It delivers 70kHz gain-bandwidth, 1µA quiescent current, 90dB open-loop gain, and operates from 1.8V to 5.5V supply - enabling precision sensing in energy-constrained portable instrumentation.
For engineers reviewing the OPA349NA/250 datasheet, OPA349NA/250 pinout, OPA349NA/250 application, or OPA349NA/250 equivalent, key selection criteria include micropower operation (<2µA max), rail-to-rail I/O swing (±350mV of rails), low input bias current (≤10pA), and SOT23-5 package compatibility with high-density PCB layouts.
Technical Context
The OPA349NA/250 employs a complementary differential input stage enabling 200mV beyond-rail common-mode range and stable unity-gain operation without external compensation. Its CMOS architecture achieves 10pA max input bias current and 300nV/√Hz input voltage noise density at 1kHz.
It supports single-supply operation from 1.8V to 5.5V with output drive capability of ±8mA, 350mV rail-to-rail swing at 10kΩ load, and thermal performance rated for 0°C to +70°C ambient - optimized for analog front-end stages in remote sensors and low-voltage A/D driver circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.8V to 5.5V - enables direct interface with Li-ion, coin-cell, and solar-harvested power sources without regulation. |
| Quiescent Current | 1µA typical - extends battery life in always-on sensor nodes and smoke detectors. |
| Gain-Bandwidth Product | 70kHz - sufficient for DC-coupled thermistor, RTD, and gas sensor signal amplification. |
| Input Bias Current | ≤10pA max - permits use of >10MΩ feedback/source resistors without significant offset error. |
| Input Common-Mode Range | (V−) − 0.2V to (V+) + 0.2V - supports direct sensing of signals near supply rails in single-supply systems. |
| Output Swing | Within 350mV of rails at 10kΩ load - preserves dynamic range for 12-bit ADCs operating at 3.3V or lower. |
| Open-Loop Gain | 90dB - ensures <0.1% gain error in unity-gain buffer configurations driving high-impedance loads. |
Pinout & Package
SOT23-5 surface-mount package (DBV), 2.9mm × 1.6mm footprint, 1.1mm max height, moisture sensitivity level 2-260°C-1 year.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (V−) | Negative supply / ground reference | Connects to system ground or negative rail; supports single-supply operation down to 1.8V. |
| 2 (+In) | Non-inverting input | High-impedance CMOS node; accepts signals up to 200mV beyond V− or V+ without damage. |
| 3 (−In) | Inverting input | Differential input terminal; matched to +In for <13mV max input offset over temperature. |
| 4 (Out) | Amplifier output | Capable of sourcing/sinking ±8mA; swings to within 350mV of rails under 10kΩ load. |
| 5 (V+) | Positive supply | Accepts 1.8V–5.5V; bypassing with 0.01µF ceramic capacitor required for stability. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input and output | Enables full-scale signal utilization in single-supply systems without level-shifting circuitry. |
| Unity-gain stable | Eliminates need for external compensation components in buffer, filter, and gain-stage designs. |
| 1µA quiescent current | Reduces average power to <5.5µW at 5.5V - critical for multi-year battery operation. |
| 10pA max input bias current | Minimizes voltage drop across high-value sensor resistors (e.g., photodiode, thermistor networks). |
| 70kHz bandwidth | Supports accurate amplification of slow-varying industrial and environmental sensor outputs. |
Applications
| Battery-Powered Sensor Front-End | Low-Voltage A/D Driver |
|---|---|
Use Scenario: Amplifying microamp-level current from CO gas sensors in portable safety monitors. IC Role / Device Role / Timing Role: Precision transimpedance amplifier with rail-to-rail output swing into 12-bit SAR ADC reference voltage. Use Value: 10pA input bias avoids loading high-impedance sensor elements; 1µA IQ extends 2xAA battery life to >3 years. | Use Scenario: Driving the analog input of an MSP430-based data logger powered by a 3.0V coin cell. IC Role / Device Role / Timing Role: Unity-gain buffer isolating high-impedance voltage divider from ADC sample-and-hold capacitance. Use Value: Rail-to-rail I/O maintains full 0–3.0V input range; 350mV rail margin ensures reliable settling before conversion. |
| Solar-Harvested Energy Monitoring | Smoke Detector Analog Conditioning |
Use Scenario: Scaling photovoltaic panel voltage for MPPT controller input in off-grid IoT gateways. IC Role / Device Role / Timing Role: Low-drift, low-power difference amplifier measuring shunt voltage across charging path. Use Value: 1.8V minimum supply allows operation during dawn/dusk low-light conditions; 90dB AOL minimizes gain error. | Use Scenario: Amplifying ionization chamber current in battery-backed residential smoke alarms. IC Role / Device Role / Timing Role: High-input-impedance current-to-voltage converter feeding comparator threshold detection. Use Value: 1µA IQ contributes <0.1% to total standby current; rail-to-rail output ensures clean logic-level transitions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar micropower op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV2401IDBVR | Same 1µA IQ and rail-to-rail I/O, but 5.5kHz GBW (vs 70kHz); 10x lower bandwidth limits sensor response. | Not suitable for >5kHz signal paths (e.g., fast gas transient detection); acceptable for DC/low-frequency thermistors. | Select TLV2401IDBVR only when bandwidth demand is ≤5kHz and cost sensitivity outweighs speed requirement. |
| OPA347UA/2K5 | 20µA IQ (20× higher), 350kHz GBW, same 1.8–5.5V supply; higher power enables faster settling (6µs vs 65µs). | Preferred for battery-powered systems requiring sub-10µs step response (e.g., pulse oximetry front-end), not ultra-low-power longevity. | Choose OPA347UA/2K5 when system prioritizes speed over battery life; avoid where <2µA total quiescent budget is mandatory. |
Compared with TLV2401IDBVR and OPA347UA/2K5, the OPA349NA/250 uniquely balances 70kHz bandwidth and 1µA IQ in SOT23-5 - making it optimal for precision, long-life sensor interfaces where both speed and micropower are non-negotiable.
Availability
OPA349NA/250 is available at Aetrix Electronics and suitable for battery packs, portable medical devices, and remote environmental sensors requiring stable component supply with guaranteed traceability and lifecycle management.
Supply support for OPA349NA/250 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 company delivering analog and embedded processing solutions for industrial, automotive, and personal electronics markets.
The OPA349 series belongs to TI's precision micropower op amp product line, engineered specifically for ultra-low-quiescent-current signal conditioning in battery- and energy-harvesting–powered systems.
FAQ
What is the operating temperature range specified for the OPA349NA/250?
The OPA349NA/250 is specified for operation from 0°C to +70°C ambient temperature. Its electrical characteristics - including quiescent current, input offset voltage, and open-loop gain - are guaranteed across this range per the SBOS121B datasheet. The device may function outside this range, but performance is not assured.
Can the OPA349NA/250 drive capacitive loads without oscillation?
The OPA349NA/250 can drive up to 20pF capacitive load stably in unity-gain configuration, as verified in typical characteristics. For loads exceeding 20pF - such as ADC input capacitance or long PCB traces - a small series resistor (10–50Ω) or feedback capacitor is recommended to maintain phase margin and prevent peaking or overshoot.
Does the OPA349NA/250 require external compensation for unity-gain stability?
No, the OPA349NA/250 is internally compensated and unity-gain stable. The datasheet explicitly states "unity-gain stable" and confirms no external compensation is needed. This simplifies design in buffer, active filter, and sensor interface applications where minimal external components are critical.
What is the maximum output current capability of the OPA349NA/250?
The OPA349NA/250 provides ±8mA continuous output current into resistive loads, with ±10mA short-circuit current capability. At 10kΩ load and 5.5V supply, it delivers full rail-to-rail swing (within 350mV of V+ and V−). Output current decreases linearly as output voltage approaches either rail due to internal headroom limitations.
How does the rail-to-rail input stage of the OPA349NA/250 affect common-mode rejection?
The OPA349NA/250 uses complementary N-channel and P-channel input pairs to achieve rail-to-rail input range. Within the 400mV transition region near (V+) – 1.3V, CMRR degrades - dropping to ~46dB versus 60dB outside that zone. For best CMRR, keep common-mode voltage below (V+) – 1.5V or above (V−) + 1.5V in precision applications.
OPA349NA/250 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/250 FAQ
1.How can I place an order for OPA349NA/250 through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA349NA/250 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/250 reliable?
The price and inventory of OPA349NA/250 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA349NA/250 is usually 5 days.
3.What payment methods are accepted for OPA349NA/250?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA349NA/250 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA349NA/250?
OPA349NA/250 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA349NA/250 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/250?
For technical support, including OPA349NA/250 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA349NA/250 requirements.
6.How does Aetrix verify that OPA349NA/250 is sourced from the original manufacturer or authorized distributors?
All OPA349NA/250 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/250 meets industry standards.
7.What is the process for return or replacement of OPA349NA/250?
All OPA349NA/250 units undergo pre-shipment inspection (PSI). If there is an issue with OPA349NA/250, 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/250 part is unused and in its original packaging.
Return procedure for OPA349NA/250:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
OPA349NA/250 Tags
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