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Texas Instruments OPA2349EA/3K
- Part No.:
- OPA2349EA/3K
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SOT-23-8
- Datasheet:
-
OPA2349EA/3K.pdf
- Description:
- IC CMOS 2 CIRCUIT SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:4,823
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Product details
Overview
OPA2349EA/3K 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, and operates from 1.8V to 5.5V supply rails - enabling long-life operation in portable smoke detectors and solar-powered remote sensors.
For engineers reviewing the OPA2349EA/3K datasheet, OPA2349EA/3K pinout, OPA2349EA/3K application, or OPA2349EA/3K equivalent, key selection criteria include its –40°C to +70°C temperature rating, SOT23-8 package footprint, 10pA max input bias current, rail-to-rail output swing within 350mV of rails, and unity-gain stability without external compensation.
Technical Context
The OPA2349EA/3K employs complementary N-channel and P-channel input differential pairs to achieve rail-to-rail input common-mode range extending 200mV beyond both supply rails. Its fully differential output stage supports rail-to-rail swing with 8mA drive capability into 10kΩ loads.
It features a single-pole dominant-pole compensation architecture ensuring unity-gain stability across 1.8V–5.5V supplies and –40°C to +70°C operating range. Open-loop gain remains ≥74dB (RL = 1MΩ) over temperature, supporting precision DC-coupled sensing applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.8V to 5.5V - enables direct interface with Li-ion, alkaline, and single-cell solar harvesters without LDO. |
| Quiescent Current (per amp) | 1µA typical - extends battery life in always-on sensor nodes exceeding 10 years on CR2032. |
| Gain-Bandwidth Product | 70kHz - sufficient for anti-aliasing filters, thermistor signal conditioning, and low-speed A/D driver stages. |
| Input Bias Current | ±10pA max - permits use of >10MΩ feedback/source resistors without significant offset error. |
| Output Swing (vs rails) | 350mV - preserves >93% dynamic range at 5.5V supply, critical for 10-bit+ ADC interfacing. |
| Open-Loop Gain | 90dB - ensures <0.1% gain error in unity-gain buffer configurations with 10kΩ load. |
| Input Common-Mode Range | (V–) – 0.2V to (V+) + 0.2V - supports direct sensing of signals below ground or above V+ in single-supply systems. |
Pinout & Package
SOT23-8 surface-mount 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 | +In A | Non-inverting input of amplifier A - accepts signals from 0.2V below V– to 0.2V above V+. |
| 2 | –In A | Inverting input of amplifier A - used for feedback or differential sensing configurations. |
| 3 | Out A | Amplifier A output - drives capacitive loads up to 500pF with stable step response. |
| 4 | V– | Negative supply rail - must be bypassed with 0.01µF ceramic capacitor near pin. |
| 5 | V+ | Positive supply rail - shared by both amplifiers; requires local 0.01µF ceramic decoupling. |
| 6 | –In B | Inverting input of amplifier B - electrically isolated from amplifier A; no internal crosstalk. |
| 7 | +In B | Non-inverting input of amplifier B - identical input voltage range and bias current as Pin 1. |
| 8 | Out B | Amplifier B output - independent output stage; supports simultaneous dual-sensor conditioning. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail I/O | Enables full-scale signal utilization in 1.8V–5.5V single-supply systems without level-shifting circuitry. |
| Unity-gain stable | Eliminates need for external compensation components, reducing BOM count and PCB area in filter/buffer designs. |
| 10pA max input bias current | Supports high-impedance sensor interfaces (e.g., pH electrodes, photodiodes) with minimal input loading error. |
| –40°C to +70°C specified range | Validated performance for industrial-grade portable equipment operating across extended ambient conditions. |
| SC70/SOT23-8/SO-8 package options | Facilitates migration between density-constrained (SOT23-8) and test-friendly (SO-8) layouts without circuit redesign. |
Applications
| Battery-Powered Smoke Detectors | Solar-Harvested Remote Sensors |
|---|---|
Use Scenario: Continuous monitoring of ionization chamber current in low-power smoke alarms powered by 9V alkaline batteries. IC Role / Device Role / Timing Role: Dual op-amp configured as transimpedance amplifier (A) and reference buffer (B) for analog front-end signal conditioning. Use Value: 1µA quiescent current per amplifier extends battery life beyond 5 years while maintaining 70kHz bandwidth for fast alarm response. | Use Scenario: Signal amplification of thermistor and humidity sensor outputs in off-grid environmental monitoring nodes powered by micro-solar panels. IC Role / Device Role / Timing Role: Dual amplifier used for ratiometric sensor excitation and low-drift differential amplification prior to 12-bit SAR ADC sampling. Use Value: Rail-to-rail input allows direct connection to sensor bridges; 10pA input bias prevents measurement drift in high-resistance sensor networks. |
| PCMCIA Card Analog Interfaces | Portable Medical Pulse Oximeters |
Use Scenario: Space-constrained PCMCIA card requiring dual-channel analog signal routing and level-shifting for legacy industrial I/O modules. IC Role / Device Role / Timing Role: Dual op-amp implementing programmable gain stage and output clamp protection for ±10V analog I/O conversion. Use Value: SOT23-8 footprint fits within tight PCMCIA Type II mechanical envelope; 350mV rail swing ensures compatibility with 3.3V ADC references. | Use Scenario: Low-noise amplification of weak red/IR photodiode currents in battery-operated pulse oximetry probes. IC Role / Device Role / Timing Role: Dual amplifier used for synchronous demodulation (A) and DC offset cancellation (B) in analog front-end. Use Value: 8mA output drive supports driving 10kΩ ADC input impedance; 300nV/√Hz noise density preserves SNR in sub-µA photocurrent detection. |
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 | 1µA IQ, 5.5kHz GBW, SO-8 only - 12× lower bandwidth than OPA2349EA/3K. | Not suitable for >5kHz sensor filtering or A/D driver applications requiring 70kHz settling. | Select when ultra-low frequency (<1kHz) DC amplification suffices and SO-8 layout is fixed. |
| OPA2347UA | 20µA IQ, 350kHz GBW, SO-8/SOT23-8 - 20× higher supply current, 5× higher bandwidth. | Acceptable where higher speed is needed and battery life >2 years is still achievable. | Select when system requires faster step response or higher closed-loop gain stability margin. |
Compared with TLV2242IDR and OPA2347UA, the OPA2349EA/3K uniquely balances 70kHz bandwidth with 1µA power consumption in SOT23-8, making it optimal for long-life, medium-bandwidth sensor signal chains where board space and energy budget are tightly constrained.
Availability
OPA2349EA/3K is available at Aetrix Electronics and suitable for battery packs, portable medical devices, and solar-powered remote sensors requiring stable component supply with guaranteed long-term sourcing.
Supply support for OPA2349EA/3K 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 headquartered in Dallas, Texas, delivering analog and embedded processing solutions since 1930.
The OPA2349EA/3K belongs to TI's precision micropower op-amp product line, engineered specifically for energy-constrained, space-sensitive applications including portable instrumentation, wireless sensor nodes, and battery-backed safety systems.
FAQ
What is the operating temperature range specified for the OPA2349EA/3K?
The OPA2349EA/3K is specified for operation from –40°C to +70°C, with extended operating range up to +85°C. This rating is validated per TI's production test flow and applies to the SOT23-8 packaged device under standard JEDEC conditions. The OPA2349EA/3K maintains 1µA quiescent current and 70kHz bandwidth across this full industrial temperature span.
Does the OPA2349EA/3K require external compensation for unity-gain stability?
No, the OPA2349EA/3K is internally compensated for unity-gain stability and requires no external components to maintain phase margin across its full supply (1.8V–5.5V) and temperature (–40°C to +70°C) ranges. This is confirmed in the datasheet's "FEATURES" section and verified in Figure 1 of the SBOS121B revision.
What is the maximum output current drive capability of the OPA2349EA/3K?
The OPA2349EA/3K delivers ±8mA output current into resistive loads, with short-circuit current rated at ±10mA. This is measured at VS = +5.5V and TA = +25°C per Electrical Characteristics table on page 4 of SBOS121B. Output swing degrades to within 350mV of rails at 8mA load, preserving usable dynamic range.
Can the OPA2349EA/3K be used with a 1.8V single supply?
Yes, the OPA2349EA/3K is fully specified and tested from 1.8V to 5.5V. At 1.8V, it maintains 1µA quiescent current, 70kHz gain-bandwidth, and rail-to-rail input/output operation - enabling direct integration with energy-harvesting circuits and low-voltage microcontrollers without level-shifting.
What package type is used for the OPA2349EA/3K orderable part?
The OPA2349EA/3K uses the SOT23-8 (DCN) package: 8-pin, 1.8mm × 2.9mm body size, 1.1mm max height, lead-free NiPdAu finish, and moisture sensitivity level 2 per JEDEC J-STD-020. Pin 1 orientation follows quadrant Q3 tape-and-reel configuration per TI's packaging addendum.
OPA2349EA/3K 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/3K FAQ
1.How can I place an order for OPA2349EA/3K through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA2349EA/3K 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/3K reliable?
The price and inventory of OPA2349EA/3K are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA2349EA/3K is usually 5 days.
3.What payment methods are accepted for OPA2349EA/3K?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA2349EA/3K transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA2349EA/3K?
OPA2349EA/3K orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA2349EA/3K 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/3K?
For technical support, including OPA2349EA/3K datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA2349EA/3K requirements.
6.How does Aetrix verify that OPA2349EA/3K is sourced from the original manufacturer or authorized distributors?
All OPA2349EA/3K 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/3K meets industry standards.
7.What is the process for return or replacement of OPA2349EA/3K?
All OPA2349EA/3K units undergo pre-shipment inspection (PSI). If there is an issue with OPA2349EA/3K, 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/3K part is unused and in its original packaging.
Return procedure for OPA2349EA/3K:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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