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Texas Instruments OPA349UA/2K5
- Part No.:
- OPA349UA/2K5
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA349UA/2K5.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,916
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Product details
Overview
OPA349UA/2K5 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 OPA349UA/2K5 datasheet, OPA349UA/2K5 pinout, OPA349UA/2K5 application, or OPA349UA/2K5 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 legacy analog layouts.
Technical Context
The OPA349UA/2K5 employs a complementary differential input stage enabling 200mV beyond-rail common-mode range and stable operation across its full 1.8V–5.5V supply range. Its CMOS architecture achieves 10pA max input bias current and 300nV/√Hz input voltage noise density at 1kHz.
This device uses internal class-AB output stage design to deliver ±8mA drive capability while maintaining rail-to-rail output swing (300mV from rails at 1MΩ load). It is fully specified over 0°C to +85°C operating temperature and requires no external compensation for unity-gain stability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.8V to 5.5V - supports direct connection to single-cell Li-ion or two-cell alkaline batteries without regulation. |
| Quiescent Current | 1µA typical - enables multi-year operation in always-on remote sensor nodes powered by coin cells. |
| Gain-Bandwidth Product | 70kHz - sufficient for anti-aliasing filters, low-speed transducer amplification, and A/D driver applications. |
| Input Offset Voltage | ±10mV max - ensures <0.2% error in 5V full-scale measurement circuits with high-impedance sources. |
| Output Swing | Within 300mV of rails (RL = 1MΩ) - preserves >90% dynamic range in 1.8V-supply systems. |
| Open-Loop Gain | 90dB - provides ≥1000 V/V loop gain at DC for stable closed-loop configurations with 1% accuracy. |
| Input Bias Current | 10pA max - permits use of >10MΩ feedback and source resistors without significant offset drift. |
Pinout & Package
OPA349UA/2K5 is housed in an industry-standard SOIC-8 (D) surface-mount package with 1.27mm lead pitch and 150°C/W thermal resistance. Pin 1 is located at the index corner per JEDEC MO-153.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (NC) | No internal connection | Unused pad; must remain unconnected to avoid parasitic coupling or ESD path disruption. |
| 2 (V+) | Positive power supply | Accepts 1.8V–5.5V; requires local 0.01µF ceramic bypass capacitor to ground for stability. |
| 3 (Out) | Amplifier output | Drives loads up to ±8mA; rail-to-rail swing enables full utilization of ADC input range. |
| 4 (NC) | No internal connection | Unused pad; electrically isolated - no routing or grounding required. |
| 5 (NC) | No internal connection | Unused pad; maintains symmetry and mechanical integrity of SOIC-8 body. |
| 6 (–In) | Inverting input | Differential node with 10pA max bias current; compatible with high-impedance sensor bridges. |
| 7 (+In) | Non-inverting input | Common-mode range extends 200mV beyond rails - supports direct sensing of grounded signals. |
| 8 (V–) | Negative power supply / Ground | Reference node for single-supply operation; must be low-impedance to minimize PSRR degradation. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input range | Extends 200mV beyond supply rails - eliminates level-shifting circuitry when interfacing with grounded sensors. |
| Unity-gain stable | No external compensation required - reduces BOM count and layout area in buffer and gain-of-one configurations. |
| Ultra-low quiescent current | 1µA typical - enables continuous monitoring in energy-harvesting systems with µW-level power budgets. |
| Wide supply range | 1.8V to 5.5V - accommodates aging battery discharge curves without performance degradation. |
| Low input bias current | 10pA max - supports precision amplification of high-impedance pH electrodes, thermopiles, and piezoresistive elements. |
Applications
| Battery-Powered Smoke Detection | Portable Medical Sensor Interface |
|---|---|
|
Use Scenario: Amplifying low-level ionization chamber current in battery-operated residential smoke alarms. IC Role / Device Role / Timing Role: Precision transimpedance amplifier converting pA-level chamber current into measurable voltage. Use Value: 10pA input bias current prevents signal corruption; 1µA quiescent current extends 10-year battery life. |
Use Scenario: Conditioning thermistor and ECG electrode signals in handheld pulse oximeters. IC Role / Device Role / Timing Role: Rail-to-rail input buffer driving 12-bit SAR ADC inputs with minimal headroom loss. Use Value: 300mV output swing from rails preserves >94% dynamic range on 3.3V supply, improving SNR. |
| Solar-Powered Environmental Monitoring | PCMCIA Card Signal Conditioning |
|
Use Scenario: Amplifying photodiode and gas sensor outputs in off-grid air quality loggers. IC Role / Device Role / Timing Role: Micropower front-end amplifier with high-impedance input for low-leakage sensor interfaces. Use Value: 1.8V minimum supply allows direct operation from supercapacitor storage, eliminating LDO losses. |
Use Scenario: Level-shifting and filtering analog signals in legacy PCMCIA data acquisition cards. IC Role / Device Role / Timing Role: Unity-gain stable buffer isolating ADC reference from noisy digital bus coupling. Use Value: SOIC-8 footprint ensures drop-in replacement for obsolete op amps in space-constrained card layouts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 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); 10x lower bandwidth limits filter and A/D driver use. | Targeted at ultra-low-frequency sensor conditioning only - unsuitable for 10kHz+ signal paths or fast-settling ADC drivers. | Select TLV2401CDR only when bandwidth demand is <10kHz and cost sensitivity outweighs speed requirements. |
| OPA347UA/2K5 | 20µA IQ (20× higher), 350kHz GBW, same SO-8 package; higher power enables faster settling and better noise performance. | Preferred for battery-powered instruments requiring sub-µs settling or lower 1/f noise - trades 20× current for 5× bandwidth. | Choose OPA347UA/2K5 when system budget allows >10µA per channel and response time <100µs is critical. |
Compared with TLV2401CDR and OPA347UA/2K5, the OPA349UA/2K5 uniquely balances sub-2µA operation with 70kHz bandwidth - making it the only option for long-life, medium-speed sensor interfaces where both micropower and usable AC response are mandatory.
Availability
OPA349UA/2K5 is available at Aetrix Electronics and suitable for battery packs, portable medical devices, and solar-powered environmental monitors requiring stable component supply across extended production lifecycles.
Supply support for OPA349UA/2K5 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 over 50 years of innovation in precision amplifiers and low-power signal chains.
The OPA349 series belongs to TI's micropower operational amplifier product line, engineered specifically for energy-constrained applications including wireless sensors, portable instrumentation, and battery-backed safety systems.
FAQ
What is the operating temperature range for the OPA349UA/2K5?
The OPA349UA/2K5 is specified for operation from 0°C to +85°C ambient temperature. Its electrical characteristics - including quiescent current, input offset voltage, and open-loop gain - are guaranteed across this full range. The device is rated for storage between –65°C and +150°C, and junction temperature must not exceed 150°C during operation.
Can the OPA349UA/2K5 drive capacitive loads without oscillation?
The OPA349UA/2K5 can drive up to 500pF capacitive loads with minimal overshoot when configured as a unity-gain buffer, as verified in TI's SBOS121B typical characteristics. For loads exceeding 500pF or in inverting configurations, a small series resistor (10–50Ω) at the output is recommended to isolate capacitance and maintain phase margin.
Does the OPA349UA/2K5 require external compensation for unity-gain stability?
No, the OPA349UA/2K5 is internally compensated and unity-gain stable by design. No external capacitors or resistors are needed for stable operation at gain = +1 or –1. This simplifies layout and eliminates tuning steps in low-speed buffer and follower applications.
What is the maximum output current capability of the OPA349UA/2K5?
The OPA349UA/2K5 delivers ±8mA continuous output current into resistive loads. Short-circuit current is ±10mA, and the device includes thermal shutdown protection. Output current capability remains consistent across the 1.8V–5.5V supply range, supporting robust interfacing with ADC references and LED indicators.
How does the rail-to-rail input stage of the OPA349UA/2K5 behave near the supply rails?
The OPA349UA/2K5 uses complementary N- and P-channel input pairs, creating a 400mV transition region near (V+) – 1.3V where both stages conduct. Within this region, CMRR, PSRR, and THD degrade - so designs should bias common-mode voltage outside this zone using a stable reference or resistor divider for best precision performance.
OPA349UA/2K5 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- 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:
- 8-SOIC
OPA349UA/2K5 FAQ
1.How can I place an order for OPA349UA/2K5 through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA349UA/2K5 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/2K5 reliable?
The price and inventory of OPA349UA/2K5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA349UA/2K5 is usually 5 days.
3.What payment methods are accepted for OPA349UA/2K5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA349UA/2K5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA349UA/2K5?
OPA349UA/2K5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA349UA/2K5 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/2K5?
For technical support, including OPA349UA/2K5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA349UA/2K5 requirements.
6.How does Aetrix verify that OPA349UA/2K5 is sourced from the original manufacturer or authorized distributors?
All OPA349UA/2K5 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/2K5 meets industry standards.
7.What is the process for return or replacement of OPA349UA/2K5?
All OPA349UA/2K5 units undergo pre-shipment inspection (PSI). If there is an issue with OPA349UA/2K5, 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/2K5 part is unused and in its original packaging.
Return procedure for OPA349UA/2K5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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