My Inquiry
My Account
Texas Instruments OPA2349UA/2K5
- Part No.:
- OPA2349UA/2K5
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA2349UA/2K5.pdf
- Description:
- IC CMOS 2 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:5,910
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
OPA2349UA/2K5 from Texas Instruments is a dual ultra-low-power rail-to-rail input/output CMOS operational amplifier designed for battery-powered signal conditioning in space-constrained 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 sensing in portable smoke detectors and solar-powered remote sensors.
For engineers reviewing the OPA2349UA/2K5 datasheet, OPA2349UA/2K5 pinout, OPA2349UA/2K5 application, or OPA2349UA/2K5 equivalent, key selection criteria include micropower operation at sub-2V supply, rail-to-rail I/O swing within 350mV of rails, low 10pA input bias current, and SOIC-8 packaging suitable for high-density PCB layouts in PCMCIA cards and battery packs.
Technical Context
The OPA2349UA/2K5 integrates two independent amplifiers in a single SOIC-8 package, each featuring complementary N-channel/P-channel input stages enabling rail-to-rail common-mode input range extending 200mV beyond supply rails. Its unity-gain stability eliminates need for external compensation.
It supports single-supply operation down to 1.8V with guaranteed performance across –40°C to +70°C ambient temperature, and maintains output drive capability of ±8mA while delivering 300mV rail swing under 1MΩ load and 350mV under 10kΩ load - critical for driving ADC reference buffers and low-voltage sensor interfaces.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.8V to 5.5V - enables direct interface with Li-ion, NiMH, and single-cell alkaline batteries without regulation. |
| Quiescent Current (per amp) | 1µA - reduces system standby power by >90% vs. standard rail-to-rail op amps, extending battery life in always-on sensors. |
| Gain-Bandwidth Product | 70kHz - sufficient for DC-coupled thermistor, gas sensor, and photodiode signal conditioning with <1% error at 10kHz. |
| Input Bias Current | 10pA max - permits use of >10MΩ feedback/source resistors without significant offset drift in high-impedance sensor front-ends. |
| Input Common-Mode Range | (V–) – 0.2V to (V+) + 0.2V - allows direct sensing of signals below ground or above V+ in single-supply configurations. |
| Output Swing (10kΩ load) | Within 350mV of rails - preserves >93% dynamic range when operating from 1.8V supply, maximizing ADC utilization. |
| Open-Loop Gain | 90dB - ensures <0.1% gain error with 10kΩ/10kΩ feedback network at room temperature. |
Pinout & Package
OPA2349UA/2K5 is housed in an 8-pin SOIC (D) surface-mount package measuring 4.9mm × 3.9mm × 1.75mm, optimized for automated assembly and thermal dissipation in compact industrial and portable designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | +In A | Non-inverting input of Amplifier A - accepts signals up to 0.2V beyond V– or V+, enabling true rail-to-rail input operation. |
| 2 | –In A | Inverting input of Amplifier A - used for feedback configuration; matched impedance critical for CMRR preservation. |
| 3 | Out A | Output of Amplifier A - drives loads up to ±8mA; swings to within 350mV of rails under 10kΩ load. |
| 4 | V– | Negative supply pin - connects to ground or negative rail; must be bypassed with 0.01µF ceramic capacitor near pin. |
| 5 | Out B | Output of Amplifier B - electrically isolated from Out A; supports dual-channel signal processing without crosstalk degradation. |
| 6 | –In B | Inverting input of Amplifier B - shares same electrical characteristics as Pin 2; supports independent gain-setting networks. |
| 7 | +In B | Non-inverting input of Amplifier B - identical rail-to-rail input behavior as Pin 1; enables dual-sensor buffering in one package. |
| 8 | V+ | Positive supply pin - accepts 1.8V–5.5V; PSRR of 1000µV/V minimizes supply noise coupling into output. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input stage | Complementary N/P-channel differential pair extends common-mode range 200mV beyond rails - eliminates level-shifting circuitry in single-supply sensor interfaces. |
| Unity-gain stable architecture | No external compensation required - simplifies layout and reduces bill-of-materials for gain-of-1 buffer and filter applications. |
| Ultra-low input bias current | 10pA maximum - prevents voltage drop across high-value source resistors (>10MΩ), preserving accuracy in pH, thermocouple, and piezoelectric sensor circuits. |
| Wide supply voltage range | 1.8V to 5.5V operation - maintains full specification compliance across depleted battery states (e.g., 1.8V cutoff for LiFePO₄ cells). |
| Low-noise design | 300nV/√Hz input voltage noise density at 1kHz - supports high-resolution measurements in low-frequency sensor applications without added filtering overhead. |
Applications
| Battery-Powered Smoke Detectors | Solar-Powered Remote Sensors |
|---|---|
Use Scenario: Amplifying weak ionization chamber current (pA–nA range) in low-power smoke alarms with multi-year battery life. IC Role / Device Role / Timing Role: Precision transimpedance amplifier converting chamber current to measurable voltage while consuming <2µA total quiescent current. Use Value: Enables 10-year coin-cell operation via 1µA per amplifier supply current and 10pA input bias - minimizing signal loss across megaohm feedback resistors. | Use Scenario: Signal conditioning for photovoltaic irradiance and temperature sensors in off-grid environmental monitoring nodes. IC Role / Device Role / Timing Role: Dual-channel rail-to-rail buffer and level shifter interfacing analog sensors to 12-bit SAR ADCs powered directly from solar harvester outputs. Use Value: 1.8V minimum supply operation allows direct connection to buck-boost converters stepping down from variable PV panel voltages, eliminating LDO overhead. |
| Portable Medical Pulse Oximeters | PCMCIA Card Analog Front-Ends |
Use Scenario: Low-noise amplification of red/IR photodiode signals in battery-operated wearable oximeters requiring continuous 24/7 monitoring. IC Role / Device Role / Timing Role: Dual-channel transimpedance amplifier with matched gain paths for synchronous LED drive and photodiode readout. Use Value: 90dB open-loop gain and 70kHz GBW ensure <0.1% gain error and minimal phase lag across 0.5–10Hz physiological bandwidth. | Use Scenario: Signal conditioning and anti-aliasing filtering in legacy PCMCIA data acquisition cards with strict board area constraints. IC Role / Device Role / Timing Role: Dual op amp providing programmable gain and rail-to-rail output drive for 16-bit DAC outputs and sensor inputs. Use Value: SOIC-8 footprint provides dual functionality in same area as single SOT23-5 op amp - doubling channel count without increasing PCB real estate. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual micropower op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV2242IDR | Same 1µA IQ and rail-to-rail I/O, but 5.5kHz GBW (vs. 70kHz); lower 70dB open-loop gain. | Not suitable for >1kHz sensor signal chains or fast-settling ADC drivers due to limited bandwidth. | Select TLV2242IDR only when bandwidth demand is <5kHz and cost sensitivity outweighs performance needs. |
| OPA2347UA | 20µA IQ (20× higher), 350kHz GBW, wider 2.1V–5.5V supply range, but no extended rail-to-rail input (only to V– + 0.1V). | Acceptable for higher-speed applications where micropower is secondary, but incompatible with sub-2V supplies or signals near V–. | Choose OPA2347UA when system requires faster settling (<10µs) and can tolerate higher quiescent current. |
Compared with TLV2242IDR and OPA2347UA, the OPA2349UA/2K5 uniquely balances ultra-low 1µA supply current, 70kHz bandwidth, and true rail-to-rail input operation down to 1.8V - making it the only option among the three for precision, low-voltage, battery-critical sensor front-ends.
Availability
OPA2349UA/2K5 is available at Aetrix Electronics and suitable for battery packs, portable medical devices, and solar-powered remote sensors requiring stable component supply with long-term production continuity.
Supply support for OPA2349UA/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 chain solutions.
The OPA2349 belongs to TI's OPAx349 micropower op amp family, engineered specifically for ultra-low-power, single-supply sensor signal conditioning in portable, energy-harvesting, and battery-constrained applications.
FAQ
What is the operating temperature range specified for the OPA2349UA/2K5?
The OPA2349UA/2K5 is specified for operation from –40°C to +70°C ambient temperature, with extended storage range from –65°C to +150°C. This industrial-grade temperature rating ensures reliable performance in outdoor environmental sensors and automotive cabin modules where thermal cycling occurs.
Does the OPA2349UA/2K5 support true rail-to-rail input operation?
Yes, the OPA2349UA/2K5 supports true rail-to-rail input operation with a common-mode voltage range extending 200mV beyond both supply rails (V– – 0.2V to V+ + 0.2V). This is achieved using a complementary N/P-channel input stage, enabling direct interfacing with sensors whose output spans the full supply range.
What is the maximum output current capability of the OPA2349UA/2K5?
The OPA2349UA/2K5 delivers ±8mA output current per amplifier under typical conditions, with short-circuit current rated at ±10mA. This allows direct driving of 10kΩ ADC input networks or LED bias circuits without external buffers, reducing component count in compact designs.
Can the OPA2349UA/2K5 drive capacitive loads without oscillation?
The OPA2349UA/2K5 is stable with capacitive loads up to 500pF when configured as a unity-gain buffer, as verified in TI's typical characteristics. For loads exceeding 500pF, a small series resistor (e.g., 10–50Ω) between amplifier output and capacitance is recommended to maintain phase margin and prevent peaking.
Is the OPA2349UA/2K5 RoHS compliant and what is its moisture sensitivity level?
Yes, the OPA2349UA/2K5 is RoHS compliant and carries a Moisture Sensitivity Level (MSL) rating of Level-2-260C-1 YEAR per JEDEC J-STD-020. This means it may be stored for up to one year at ≤30°C/60% RH and requires reflow soldering at peak temperature ≤260°C within 1 year of dry pack opening.
OPA2349UA/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:
- 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/2K5 FAQ
1.How can I place an order for OPA2349UA/2K5 through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA2349UA/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 OPA2349UA/2K5 reliable?
The price and inventory of OPA2349UA/2K5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA2349UA/2K5 is usually 5 days.
3.What payment methods are accepted for OPA2349UA/2K5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA2349UA/2K5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA2349UA/2K5?
OPA2349UA/2K5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA2349UA/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 OPA2349UA/2K5?
For technical support, including OPA2349UA/2K5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA2349UA/2K5 requirements.
6.How does Aetrix verify that OPA2349UA/2K5 is sourced from the original manufacturer or authorized distributors?
All OPA2349UA/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 OPA2349UA/2K5 meets industry standards.
7.What is the process for return or replacement of OPA2349UA/2K5?
All OPA2349UA/2K5 units undergo pre-shipment inspection (PSI). If there is an issue with OPA2349UA/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 OPA2349UA/2K5 part is unused and in its original packaging.
Return procedure for OPA2349UA/2K5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
OPA2349UA/2K5 Tags
-
LM358DT
STMicroelectronics
-
LM358DR
Texas Instruments
-
LM2904DR
Texas Instruments
-
LM358ADR
Texas Instruments
-
LM2904DGKR
Texas Instruments
-
LM324DR
Texas Instruments
-
MCP6006T-E/OT
Microchip Technology
-
MCP6006UT-E/OT
Microchip Technology
-
LM324PWR
Texas Instruments
-
LM2902PWR
Texas Instruments
-
LM2902DR
Texas Instruments
-
LM358P
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
