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Texas Instruments OPA2349UA
- Part No.:
- OPA2349UA
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA2349UA.pdf
- Description:
- IC CMOS 2 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,894
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Product details
Overview
OPA2349UA from Texas Instruments is a dual ultra-low-power rail-to-rail input/output CMOS operational amplifier designed for battery-powered systems. It delivers 70kHz gain-bandwidth, 1µA quiescent current per amplifier, 90dB open-loop gain, and operates from 1.8V to 5.5V supply - enabling precision signal conditioning in space-constrained, energy-sensitive applications such as smoke detectors and portable medical sensors.
For engineers reviewing the OPA2349UA datasheet, OPA2349UA pinout, OPA2349UA application, or OPA2349UA equivalent, key selection criteria include its –40°C to +70°C temperature rating, SO-8 package compatibility, rail-to-rail I/O swing (within 350mV of rails), 10pA max input bias current, and unity-gain stability without external compensation.
Technical Context
The OPA2349UA integrates two independent amplifiers in a single SO-8 package, each featuring a complementary N-channel/P-channel input stage enabling rail-to-rail common-mode input range extending 200mV beyond supply rails. Its 70kHz GBW and 0.02V/µs slew rate support low-frequency sensor buffering and filtering with minimal power penalty.
Designed for single-supply operation, it maintains stable performance across 1.8V–5.5V while delivering ±8mA output drive and 350mV rail-to-rail output swing at 10kΩ load. The device is specified over –40°C to +70°C and exhibits <10µA max quiescent current over temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.8V to 5.5V - supports direct connection to single Li-ion, alkaline, or coin-cell batteries without regulation. |
| Quiescent Current (per amp) | 1µA typical - enables multi-year battery life in always-on remote sensors and wearables. |
| Gain-Bandwidth Product | 70kHz - sufficient for DC-coupled ECG front-ends, thermistor signal conditioning, and slow-settling A/D driver stages. |
| Input Bias Current | ±10pA max - allows use of >10MΩ feedback/source resistors without significant offset error. |
| Open-Loop Gain | 90dB - ensures <0.1% gain error in unity-gain buffers driving high-impedance ADC inputs. |
| Rail-to-Rail Output Swing | Within 350mV of rails at 10kΩ load - maximizes dynamic range in 3.3V or lower supply systems. |
| Input Common-Mode Range | (V–) – 0.2V to (V+) + 0.2V - enables direct sensing of signals below ground or above V+ in single-supply configurations. |
Pinout & Package
OPA2349UA is housed in an SO-8 (D) surface-mount package with standard 1.27mm pitch, 5.0mm × 6.2mm footprint, and 1.75mm max height - compatible with automated assembly and IPC-7351 land patterns.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | +In A | Non-inverting input of Amplifier A - accepts signals up to 200mV beyond V+ or below V–. |
| 2 | –In A | Inverting input of Amplifier A - used for feedback configuration or differential sensing. |
| 3 | Out A | Output of Amplifier A - drives loads down to 10kΩ while maintaining rail-to-rail swing. |
| 4 | V– | Negative supply pin - connects to ground or negative rail; shared by both amplifiers. |
| 5 | V+ | Positive supply pin - supplies both amplifiers; bypassing with 0.01µF ceramic recommended. |
| 6 | –In B | Inverting input of Amplifier B - electrically isolated from Amplifier A; supports dual-channel signal paths. |
| 7 | +In B | Non-inverting input of Amplifier B - identical rail-to-rail input capability as Pin 1. |
| 8 | Out B | Output of Amplifier B - independently buffered; channel separation >66dB at 1kHz minimizes crosstalk. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low quiescent current | 1µA per amplifier - reduces system standby power to sub-microwatt levels in battery-backed monitoring circuits. |
| Rail-to-rail input and output | Input extends 200mV beyond rails; output swings to within 350mV - preserves full signal range in low-voltage systems. |
| Unity-gain stable | No external compensation required - simplifies layout and eliminates risk of instability in buffer or gain-of-one configurations. |
| Wide supply range | 1.8V to 5.5V operation - accommodates aging battery voltage drop without performance degradation or shutdown. |
| Low input bias current | 10pA max - enables high-impedance sensor interfaces (e.g., pH electrodes, photodiodes) without leakage-induced offset. |
Applications
| Battery-Powered Smoke Detection | Portable Medical Sensor Interface |
|---|---|
|
Use Scenario: Continuous analog signal conditioning of ionization chamber or photoelectric sensor outputs in battery-operated smoke alarms. IC Role / Device Role / Timing Role: Dual op-amp configured as precision transimpedance amplifier (Channel A) and reference buffer (Channel B) for ADC input scaling. Use Value: 1µA quiescent current extends 10-year battery life; rail-to-rail I/O captures full sensor dynamic range under 3V supply. |
Use Scenario: Signal amplification and level-shifting for wearable ECG or pulse oximetry front-ends powered by coin cells. IC Role / Device Role / Timing Role: Dual amplifier implementing DC-coupled instrumentation gain stage and anti-aliasing filter driver. Use Value: 10pA input bias avoids electrode polarization errors; 70kHz GBW supports 50Hz biopotential bandwidth with margin. |
| Solar-Powered Remote Environmental Monitor | PCMCIA Card Analog Front-End |
|
Use Scenario: Low-power signal conditioning for thermistor, humidity, and gas sensor arrays in off-grid solar IoT nodes. IC Role / Device Role / Timing Role: Dual op-amp used for ratiometric sensor excitation and bridge amplifier with integrated reference buffering. Use Value: Operation down to 1.8V enables direct connection to partially discharged LiFePO₄ cells; SO-8 package fits dense PCB layouts. |
Use Scenario: Analog signal routing and buffering on PCMCIA cards for data acquisition or industrial fieldbus interface modules. IC Role / Device Role / Timing Role: Dual amplifier providing gain control, offset adjustment, and ADC input drive in compact peripheral form factor. Use Value: 2.5mm × 5.0mm SO-8 footprint meets PCMCIA mechanical constraints; 1.8V–5.5V range supports host-supplied 3.3V or 5V rails. |
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 |
|---|---|---|---|
| TLV2402IDR | 1µA IQ, 5.5kHz GBW, SO-8 - significantly lower bandwidth than OPA2349UA's 70kHz. | Best suited for ultra-slow DC applications (e.g., strain gauge bridges); insufficient for 50Hz+ sensor signals. | Select TLV2402IDR only when bandwidth demand is <10kHz and cost sensitivity outweighs speed requirements. |
| OPA2347UA | 20µA IQ, 350kHz GBW, SO-8 - 20× higher supply current but 5× greater bandwidth and better noise performance. | Preferred for higher-speed filtering or driving capacitive loads >100pF where OPA2349UA may exhibit overshoot. | Choose OPA2347UA when system power budget allows >10µA per channel and signal bandwidth exceeds 20kHz. |
Compared with TLV2402IDR and OPA2347UA, the OPA2349UA uniquely balances sub-µA quiescent current with usable 70kHz bandwidth - making it optimal for battery-powered sensor nodes requiring both longevity and 50Hz–1kHz signal fidelity without layout complexity.
Availability
OPA2349UA is available at Aetrix Electronics and suitable for battery packs, portable medical devices, and solar-powered environmental monitors requiring stable component supply with long-term lifecycle assurance.
Supply support for OPA2349UA 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 OPA2349UA belongs to TI's OPA349 family of micropower rail-to-rail op-amps, engineered specifically for energy-constrained applications where extended battery life and wide supply flexibility are critical design requirements.
FAQ
What is the operating temperature range for the OPA2349UA?
The OPA2349UA is specified for operation from –40°C to +70°C, with extended storage range from –65°C to +150°C. This industrial-grade temperature rating makes it suitable for outdoor environmental sensors and automotive cabin modules where ambient conditions vary widely. The OPA2349UA maintains its 1µA quiescent current and 70kHz bandwidth across this full range, ensuring consistent performance without derating.
Does the OPA2349UA require external compensation for unity-gain stability?
No, the OPA2349UA is internally compensated and unity-gain stable - no external capacitors or resistors are needed for stable operation in buffer or gain-of-one configurations. This eliminates layout sensitivity and reduces bill-of-materials count. The device achieves this via optimized internal pole placement, verified across 1.8V–5.5V supply and –40°C to +70°C temperature ranges per the SBOS121B datasheet.
Can the OPA2349UA drive ADC inputs directly?
Yes, the OPA2349UA is commonly used to drive SAR and delta-sigma ADC inputs. Its rail-to-rail output swing (within 350mV of rails at 10kΩ), 90dB open-loop gain, and low 10pA input bias current minimize gain error and settling time. For optimal performance, pair with a 0.01µF supply bypass capacitor and ensure source impedance remains <10kΩ to avoid bandwidth reduction from parasitic capacitance.
What package options are available for the OPA2349UA?
The OPA2349UA is offered exclusively in the SO-8 (D) package - an industry-standard 8-pin small-outline IC with 1.27mm pitch, 5.0mm × 6.2mm body size, and 1.75mm max height. This package supports automated pick-and-place, reflow soldering per JEDEC Level-2-260C-1 YEAR MSL rating, and is compatible with IPC-7351 land patterns. Other variants like OPA2349EA use SOT23-8, but OPA2349UA refers only to the SO-8 version.
How does the rail-to-rail input stage of the OPA2349UA function?
The OPA2349UA uses a complementary N-channel/P-channel input stage that allows the common-mode input voltage to extend 200mV beyond both supply rails. The N-channel pair operates near V+, the P-channel pair near V–, with a 400mV transition region where both conduct. Within this region, parameters like CMRR and PSRR degrade slightly - so for highest precision, keep input signals outside (V+) – 1.5V to (V+) – 1.1V when possible.
OPA2349UA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- CMOS
- Number of Circuits:
- 2
- 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 (x2 Channels)
- Current - Output / Channel:
- 8 mA
- Voltage - Supply Span (Min):
- 1.8 V
- Voltage - Supply Span (Max):
- 5.5 V
- Operating Temperature:
- -40°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
OPA2349UA FAQ
1.How can I place an order for OPA2349UA through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA2349UA 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 OPA2349UA reliable?
The price and inventory of OPA2349UA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA2349UA is usually 5 days.
3.What payment methods are accepted for OPA2349UA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA2349UA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA2349UA?
OPA2349UA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA2349UA 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 OPA2349UA?
For technical support, including OPA2349UA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA2349UA requirements.
6.How does Aetrix verify that OPA2349UA is sourced from the original manufacturer or authorized distributors?
All OPA2349UA 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 OPA2349UA meets industry standards.
7.What is the process for return or replacement of OPA2349UA?
All OPA2349UA units undergo pre-shipment inspection (PSI). If there is an issue with OPA2349UA, 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 OPA2349UA part is unused and in its original packaging.
Return procedure for OPA2349UA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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