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Texas Instruments OPA2349EA/250
- Part No.:
- OPA2349EA/250
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SOT-23-8
- Datasheet:
-
OPA2349EA/250.pdf
- Description:
- IC CMOS 2 CIRCUIT SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:1,695
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Product details
Overview
OPA2349EA/250 from Texas Instruments is a dual ultra-low-power rail-to-rail input/output CMOS operational amplifier designed for battery-powered sensor signal conditioning and precision analog front-ends. It delivers 70kHz gain-bandwidth, 1µA quiescent current per amplifier, 90dB open-loop gain, and operates from 1.8V to 5.5V supply - enabling multi-year operation in smoke detectors and solar-powered remote sensors.
For engineers reviewing the OPA2349EA/250 datasheet, OPA2349EA/250 pinout, OPA2349EA/250 application, or OPA2349EA/250 equivalent, key selection criteria include micropower consumption under 2µA total, rail-to-rail I/O swing within 350mV of rails at 10kΩ load, unity-gain stability without external compensation, and guaranteed –40°C to +70°C operation in SOT23-8 packaging.
Technical Context
The OPA2349EA/250 integrates two independent amplifiers sharing only power rails, with complementary N-channel/P-channel input stages enabling rail-to-rail common-mode input range extending 200mV beyond V– and V+. Its unity-gain stable architecture eliminates need for external phase compensation, while low 10pA max input bias current supports high-impedance sensor interfaces using MΩ-level feedback networks.
Each amplifier features 70kHz GBW, 0.02V/µs slew rate, and output drive capability of ±8mA into 10kΩ loads. Input voltage noise is 300nV/√Hz at 1kHz, and channel separation exceeds 66dB at 1kHz - critical for dual-channel applications like differential sensor readout or active filtering where crosstalk must be minimized.
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 3.3V/5V systems without regulation |
| Quiescent Current (per amp) | 1µA typical - ensures sub-2µA total device current, essential for decade-scale battery life |
| Gain-Bandwidth Product | 70kHz - supports low-frequency sensor signal amplification (e.g., thermistors, gas sensors) with stable unity-gain configuration |
| Input Bias Current | ±10pA max - allows use of >1MΩ source impedances without significant offset error |
| Input Common-Mode Range | (V–) – 0.2V to (V+) + 0.2V - enables true rail-to-rail sensing including signals below ground or above supply in single-supply systems |
| Output Swing (10kΩ load) | Within 350mV of rails - preserves dynamic range in low-voltage ADC driver applications (e.g., 12-bit SAR with 3.3V reference) |
| Open-Loop Gain | 90dB typical - provides ≥0.01% gain accuracy for precision DC-coupled amplification |
Pinout & Package
SOT23-8 package (DCN), 1.8mm × 2.9mm footprint, 1.1mm max height, moisture sensitivity level 2, lead-free NiPdAu finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | V+ | Positive supply rail for both amplifiers - bypass with 0.01µF ceramic capacitor near pin |
| 2 | Out B | Output of second amplifier - drives loads up to ±8mA with rail-to-rail swing |
| 3 | –In B | Inverting input of second amplifier - high-impedance node sensitive to PCB leakage |
| 4 | +In B | Non-inverting input of second amplifier - accepts signals from V– – 0.2V to V+ + 0.2V |
| 5 | Out A | Output of first amplifier - electrically isolated from Out B; shares only V+/V– rails |
| 6 | –In A | Inverting input of first amplifier - matched to –In B for dual-channel differential configurations |
| 7 | +In A | Non-inverting input of first amplifier - used for single-ended or instrumentation amplifier topologies |
| 8 | V– | Negative supply rail (typically ground in single-supply systems) - return path for both amplifiers |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input stage | Complementary N/P-channel pair extends common-mode range 200mV beyond rails - enables direct interfacing with transducers operating near supply limits |
| Unity-gain stable | No external compensation required - simplifies layout and reduces BOM count in buffer and gain-of-one configurations |
| Ultra-low quiescent current | 1µA per amplifier - achieves <2µA total IDDQ, critical for energy harvesting and long-life battery systems |
| Wide supply range | 1.8V to 5.5V operation - maintains performance across full discharge curve of alkaline, Li-ion, and NiMH cells |
| Low input bias current | 10pA max - minimizes voltage drop across high-value sensor resistors (e.g., 10MΩ photoresistors) |
Applications
| Battery-Powered Smoke Detectors | Solar-Powered Remote Environmental Sensors |
|---|---|
Use Scenario: Amplifying weak ionization chamber currents (pA–nA range) in low-power smoke alarms with 10-year coin-cell operation. IC Role / Device Role / Timing Role: Precision transimpedance amplifier converting chamber current to measurable voltage while consuming <2µA total. Use Value: Enables 10-year battery life by minimizing quiescent current, while rail-to-rail input accommodates varying chamber bias voltages across temperature. |
Use Scenario: Signal conditioning for photodiode or thermistor outputs in unattended solar-charged field nodes monitoring air quality or soil moisture. IC Role / Device Role / Timing Role: Dual-channel sensor front-end: one amp buffers reference voltage, the other amplifies sensor output with programmable gain. Use Value: Dual configuration reduces component count; 70kHz bandwidth supports fast transient detection (e.g., rapid CO₂ spikes); 1.8V operation matches solar panel minimum output. |
| Portable Medical Pulse Oximeters | PCMCIA Card Analog Interfaces |
Use Scenario: Driving red/IR LED current sources and amplifying photodiode signals in battery-operated pulse oximetry modules. IC Role / Device Role / Timing Role: Dual op-amp performing synchronous LED drive (via current sink) and transimpedance amplification of photodiode current. Use Value: Rail-to-rail output swing ensures full LED on/off control from 3.3V supply; low input bias prevents signal corruption from high-impedance photodiodes. |
Use Scenario: Providing analog signal routing, level-shifting, and anti-aliasing filtering in PCMCIA cards for data acquisition or industrial I/O expansion. IC Role / Device Role / Timing Role: Dual amplifier implementing programmable-gain stage and 70kHz low-pass filter before ADC sampling. Use Value: SOT23-8 footprint fits tight PCMCIA board spacing; unity-gain stability avoids oscillation in compact layouts; 1µA current extends host system battery runtime. |
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 only - 12× lower bandwidth than OPA2349EA/250 | Targeted at ultra-low-speed DC applications (e.g., pH meters); unsuitable for 70kHz sensor excitation or filtering | Select TLV2402IDR only when bandwidth <10kHz suffices and SO-8 package is preferred over SOT23-8 |
| OPA2347UA | 20µA IQ, 350kHz GBW, SO-8/SOT23-8 - 20× higher supply current, 5× higher bandwidth | Designed for higher-speed portable audio or active filters where power budget allows >40µA total | Choose OPA2347UA when 350kHz bandwidth is required and 20µA per amp is acceptable; not a drop-in replacement due to current mismatch |
Compared with TLV2402IDR and OPA2347UA, the OPA2349EA/250 uniquely balances 70kHz bandwidth with 1µA per amplifier consumption in SOT23-8, making it optimal for battery-critical sensor front-ends requiring moderate speed and maximum runtime.
Availability
OPA2349EA/250 is available at Aetrix Electronics and suitable for battery packs, smoke/fire detection systems, and solar-powered remote sensors requiring stable component supply with long-term lifecycle support.
Supply support for OPA2349EA/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 leader specializing in analog and embedded processing technologies, with decades of expertise in precision op amps and low-power signal chain solutions.
The OPA2349EA/250 belongs to TI's OPA349/2349 family - engineered specifically for ultra-low-power, rail-to-rail sensor signal conditioning in space-constrained, battery-dependent applications.
FAQ
What is the operating temperature range specified for the OPA2349EA/250?
The OPA2349EA/250 is specified for operation from –40°C to +70°C, with extended operating range up to +85°C. This makes it suitable for industrial and automotive cabin environments where ambient temperatures vary widely, unlike the single-channel OPA349 which is rated only from 0°C to +70°C.
Does the OPA2349EA/250 require external compensation for unity-gain stability?
No, the OPA2349EA/250 is internally compensated and unity-gain stable. Unlike some micropower op amps, it does not require external capacitors or resistor networks to prevent oscillation in buffer or gain-of-one configurations - simplifying design and reducing bill-of-materials cost.
What is the maximum output current drive capability of each amplifier in the OPA2349EA/250?
Each amplifier in the OPA2349EA/250 can source or sink ±8mA into a 10kΩ load while maintaining rail-to-rail output swing within 350mV of the supply rails. Short-circuit current is ±10mA, but continuous operation at full short-circuit is not recommended due to thermal limitations.
Can the OPA2349EA/250 operate from a 1.8V supply while maintaining full specifications?
Yes, the OPA2349EA/250 is fully specified and tested from 1.8V to 5.5V. At 1.8V, it retains 70kHz gain-bandwidth, 1µA quiescent current, rail-to-rail input/output swing, and 90dB open-loop gain - ensuring consistent performance across the entire battery discharge curve of lithium primary or alkaline cells.
What package type is used for the OPA2349EA/250, and what are its key mechanical dimensions?
The OPA2349EA/250 uses the SOT23-8 (DCN) package: 2.9mm × 1.8mm body size, 1.1mm maximum height, 0.65mm pin pitch. It is RoHS-compliant with NiPdAu lead finish and moisture sensitivity level 2 (260°C peak reflow, 1-year floor life).
OPA2349EA/250 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SOT-23-8
- Packaging:
- Tape & Reel (TR)
- 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:
- -55°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-8
OPA2349EA/250 FAQ
1.How can I place an order for OPA2349EA/250 through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA2349EA/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 OPA2349EA/250 reliable?
The price and inventory of OPA2349EA/250 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA2349EA/250 is usually 5 days.
3.What payment methods are accepted for OPA2349EA/250?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA2349EA/250 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA2349EA/250?
OPA2349EA/250 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA2349EA/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 OPA2349EA/250?
For technical support, including OPA2349EA/250 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA2349EA/250 requirements.
6.How does Aetrix verify that OPA2349EA/250 is sourced from the original manufacturer or authorized distributors?
All OPA2349EA/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 OPA2349EA/250 meets industry standards.
7.What is the process for return or replacement of OPA2349EA/250?
All OPA2349EA/250 units undergo pre-shipment inspection (PSI). If there is an issue with OPA2349EA/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 OPA2349EA/250 part is unused and in its original packaging.
Return procedure for OPA2349EA/250:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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