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Texas Instruments OPA349UA/2K5G4
- Part No.:
- OPA349UA/2K5G4
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA349UA/2K5G4.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,223
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Product details
Overview
OPA349UA/2K5G4 from Texas Instruments is a single, 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 OPA349UA/2K5G4 datasheet, OPA349UA/2K5G4 pinout, OPA349UA/2K5G4 application, or OPA349UA/2K5G4 equivalent, key selection criteria include micropower operation below 2µA, rail-to-rail I/O swing within 350mV of rails, unity-gain stability without external compensation, and SO-8 package compatibility with high-density PCB layouts.
Technical Context
The OPA349UA/2K5G4 uses a complementary differential input stage (N-channel + P-channel pairs) to achieve rail-to-rail input common-mode range extending 200mV beyond both supply rails. Its unity-gain stable architecture eliminates need for external phase compensation, supporting direct use in buffers and filters.
Output stage delivers ±8mA drive into 10kΩ loads while swinging to within 350mV of V– and V+ rails at 5.5V supply. Input bias current remains ≤10pA (max), enabling high-impedance sensor interfacing with feedback resistors up to 10MΩ without significant offset error.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.8V to 5.5V - supports operation across full Li-ion discharge curve (4.2V → 2.7V) and single-cell alkaline (1.5V with boost or 3.0V nominal). |
| Quiescent Current | 1µA (typ) - enables multi-year battery life in always-on remote sensors and low-duty-cycle smoke detectors. |
| Gain-Bandwidth Product | 70kHz - sufficient for anti-aliasing filtering before 10-bit ADCs sampling at ≤10ksps in portable instrumentation. |
| Input Common-Mode Range | (V–) – 0.2V to (V+) + 0.2V - allows direct sensing of signals referenced to ground or V+ in single-supply systems. |
| Output Swing (RL = 10kΩ) | Within 350mV of rails - preserves >90% dynamic range at 3.3V supply for 12-bit ADC interfaces. |
| Open-Loop Gain | 90dB (min 74dB) - ensures <0.1% gain error with 10kΩ/10kΩ feedback network at room temperature. |
| Input Bias Current | ±10pA (max) - permits use of 10MΩ source resistors with <100µV input offset contribution. |
Pinout & Package
OPA349UA/2K5G4 is housed in an 8-pin SOIC (D) surface-mount package measuring 4.9mm × 3.9mm × 1.75mm, RoHS-compliant with NiPdAu lead finish and MSL Level-2 moisture sensitivity rating.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | NC | No internal connection - must be left floating or grounded per layout best practices; not used for signal or power. |
| 2 | V+ | Positive supply pin - requires local 0.01µF ceramic bypass capacitor to ground for stability in micropower operation. |
| 3 | Out | Amplifier output - capable of sourcing/sinking ±8mA; output swing limited to ≥350mV from rails under 10kΩ load. |
| 4 | NC | No internal connection - electrically isolated; no routing or thermal relief required. |
| 5 | NC | No internal connection - unused pin; avoid solder bridging or unintended coupling in high-impedance circuits. |
| 6 | –In | Inverting input - high-impedance node (10¹³Ω || 4pF); sensitive to PCB leakage and ESD; guard ring recommended. |
| 7 | +In | Non-inverting input - same impedance as –In; common-mode range extends 200mV beyond rails for true single-supply operation. |
| 8 | V– | Negative supply pin - typically ground in single-supply configurations; must be decoupled identically to V+. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input and output | Enables full utilization of 1.8V–5.5V supply range: input accepts signals from –0.2V to V+ + 0.2V; output drives to within 350mV of either rail. |
| 1µA quiescent current | Reduces average system power by >50% vs. comparable 5µA op amps - critical for coin-cell-powered fire sensors with 10-year shelf life. |
| Unity-gain stable | Operates reliably as buffer or gain-of-one amplifier without external compensation components, simplifying layout and BOM. |
| Low input bias current (10pA max) | Supports high-Z transducer interfaces (e.g., pH electrodes, piezoresistive strain gauges) without requiring guard traces or active guarding. |
| Wide temperature specification | Rated for 0°C to +85°C operating range - validated for use in automotive cabin modules and industrial handheld test equipment. |
Applications
| Battery-Powered Smoke Detection | Portable Medical Sensor Interface |
|---|---|
|
Use Scenario: Amplifying weak ionization chamber current (pA–nA range) in UL-listed residential smoke alarms powered by 9V alkaline batteries. IC Role / Device Role / Timing Role: Transimpedance amplifier converting chamber current to voltage for ADC sampling every 30 seconds. Use Value: 10pA input bias ensures <1mV offset error with 100MΩ feedback resistor; 1µA IQ extends battery life beyond 10 years. |
Use Scenario: Signal conditioning front-end for disposable glucose strip readers using electrochemical amperometry. IC Role / Device Role / Timing Role: Precision current-to-voltage converter and level-shifter driving 12-bit SAR ADC in battery-operated handheld device. Use Value: Rail-to-rail I/O enables full 0–3.3V ADC input range from 1.8V supply; 70kHz GBW supports 10ksps sampling with <0.1% settling. |
| Solar-Powered Environmental Monitoring | PCMCIA Card Analog Front-End |
|
Use Scenario: Low-power signal chain in wireless soil moisture and temperature nodes powered by 2.5V solar-charged supercapacitors. IC Role / Device Role / Timing Role: Buffer and filter driver for thermistor and capacitive humidity sensor outputs prior to multiplexed ADC acquisition. Use Value: 1.8V minimum supply allows operation during dawn/dusk low-light periods; 200mV rail extension accommodates sensor biasing schemes. |
Use Scenario: Analog signal conditioning in legacy PCMCIA data acquisition cards requiring compact, low-heat-generation op amps. IC Role / Device Role / Timing Role: Single-supply active filter and ADC driver in space-constrained 54mm × 42mm card form factor. Use Value: SO-8 package fits standard PCMCIA keep-out zones; 150°C/W θJA enables thermal management without heatsinks at 1µA dissipation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ultra-low-power operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV2401CDR | Same 1µA IQ and rail-to-rail I/O, but 5.5kHz GBW (vs. 70kHz) and 0°C to +70°C temp range only. | Limited to DC–low-frequency applications (e.g., thermocouple cold-junction compensation), not suitable for 10ksps ADC buffering. | Select TLV2401CDR only when bandwidth <10kHz suffices and extended temperature range is unnecessary. |
| OPA347UA/2K5 | 20µA IQ (20× higher), 350kHz GBW, same SO-8 package and 1.8V–5.5V supply, but not specified below 0°C. | Better for higher-speed microcontroller-based systems where power budget allows; unsuitable for 10-year battery life targets. | Choose OPA347UA/2K5 when 350kHz bandwidth and faster settling (2.5µs) are required, accepting 20× higher quiescent current. |
Compared with TLV2401CDR and OPA347UA/2K5, the OPA349UA/2K5G4 uniquely balances 70kHz bandwidth, 1µA quiescent current, and 0°C to +85°C operation in SO-8 - making it the only option for long-life, single-supply, medium-bandwidth sensor interfaces requiring guaranteed performance across industrial temperatures.
Availability
OPA349UA/2K5G4 is available at Aetrix Electronics and suitable for battery packs, portable medical devices, and environmental monitoring systems requiring stable component supply with full traceability and lifecycle support.
Supply support for OPA349UA/2K5G4 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 specializing in analog and embedded processing solutions, with leadership in precision amplifiers, data converters, and low-power signal chains.
The OPA349 series belongs to TI's precision micropower op amp product line, designed specifically for energy-constrained applications including smoke detectors, portable instrumentation, and solar-harvested IoT endpoints.
FAQ
What is the operating temperature range for the OPA349UA/2K5G4?
The OPA349UA/2K5G4 is specified for operation from 0°C to +85°C, with storage range from –65°C to +150°C. While the OPA2349 dual variant supports –40°C, the single OPA349UA/2K5G4 is not characterized below 0°C - design validation below this threshold requires customer testing.
Does the OPA349UA/2K5G4 require external compensation for unity-gain stability?
No, the OPA349UA/2K5G4 is internally compensated for unity-gain stability. It can be used directly as a voltage follower or in gain-of-one configurations without external capacitors or resistors - a key advantage over many micropower op amps that require external phase compensation.
What is the maximum output current capability of the OPA349UA/2K5G4?
The OPA349UA/2K5G4 delivers ±8mA continuous output current into resistive loads. Short-circuit current is ±10mA, and capacitive load drive is characterized up to 500pF with appropriate layout techniques - exceeding typical requirements for driving 12-bit ADC inputs or LED bias networks.
Can the OPA349UA/2K5G4 operate from a 1.8V supply while maintaining rail-to-rail output swing?
Yes, the OPA349UA/2K5G4 maintains rail-to-rail input and output functionality down to 1.8V supply. At 1.8V, output swing is specified to within 350mV of each rail under 10kΩ load, preserving usable dynamic range for low-voltage ADC interfaces in energy-harvesting systems.
How does the OPA349UA/2K5G4 handle input signals beyond the supply rails?
The OPA349UA/2K5G4 input stage includes diode clamps to the supply rails. Input signals exceeding (V–) – 0.5V or (V+) + 0.5V must be current-limited to ≤10mA to prevent damage. The specified 200mV rail extension applies only within absolute maximum ratings - external protection is required for overvoltage conditions.
OPA349UA/2K5G4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- 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:
- 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:
- 8-SOIC
OPA349UA/2K5G4 FAQ
1.How can I place an order for OPA349UA/2K5G4 through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA349UA/2K5G4 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 OPA349UA/2K5G4 reliable?
The price and inventory of OPA349UA/2K5G4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA349UA/2K5G4 is usually 5 days.
3.What payment methods are accepted for OPA349UA/2K5G4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA349UA/2K5G4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA349UA/2K5G4?
OPA349UA/2K5G4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA349UA/2K5G4 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 OPA349UA/2K5G4?
For technical support, including OPA349UA/2K5G4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA349UA/2K5G4 requirements.
6.How does Aetrix verify that OPA349UA/2K5G4 is sourced from the original manufacturer or authorized distributors?
All OPA349UA/2K5G4 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 OPA349UA/2K5G4 meets industry standards.
7.What is the process for return or replacement of OPA349UA/2K5G4?
All OPA349UA/2K5G4 units undergo pre-shipment inspection (PSI). If there is an issue with OPA349UA/2K5G4, 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 OPA349UA/2K5G4 part is unused and in its original packaging.
Return procedure for OPA349UA/2K5G4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
OPA349UA/2K5G4 Tags
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