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Texas Instruments OPA2349UAG4
- Part No.:
- OPA2349UAG4
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA2349UAG4.pdf
- Description:
- IC CMOS 2 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,794
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Product details
Overview
OPA2349UAG4 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, ±8mA output drive, and operates from 1.8V to 5.5V - enabling multi-year operation in smoke detectors and solar-powered remote sensors.
For engineers reviewing the OPA2349UAG4 datasheet, OPA2349UAG4 pinout, OPA2349UAG4 application, or OPA2349UAG4 equivalent, key selection criteria include micropower supply current stability across temperature, rail-to-rail input common-mode range extending 200mV beyond rails, output swing within 350mV of rails at 10kΩ load, unity-gain stability without external compensation, and SO-8 package compatibility with high-density portable instrumentation layouts.
Technical Context
The OPA2349UAG4 employs a complementary differential input stage (N-channel + P-channel pairs) to achieve rail-to-rail input operation, with a 400mV transition region where both pairs are active - requiring careful common-mode voltage planning to avoid CMRR/THD degradation. Its unity-gain stable architecture eliminates need for external phase compensation, supporting direct use in buffer and gain-of-one configurations.
Designed specifically for single-supply battery systems, the device maintains consistent 1µA quiescent current (typical) from –40°C to +70°C operating range and supports full 1.8V–5.5V supply scaling - ensuring reliable performance as battery voltage decays from fresh to end-of-life in portable medical monitors and wireless sensor nodes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.8V to 5.5V - enables direct interface with Li-ion, alkaline, and coin-cell batteries without regulation. |
| Quiescent Current (per amp) | 1µA (typ) - allows continuous operation for >10 years on a CR2032 coin cell in low-duty-cycle sensor nodes. |
| Gain-Bandwidth Product | 70kHz - sufficient for anti-aliasing filtering, thermistor amplification, and slow-settling A/D driver applications. |
| Input Bias Current | ±10pA (max) - permits use of >10MΩ feedback/source resistors without significant offset error in high-impedance pH or gas sensor interfaces. |
| Input Common-Mode Range | (V–) – 0.2V to (V+) + 0.2V - supports direct sensing of signals below ground or above supply in single-supply systems. |
| Output Swing (10kΩ load) | Within 350mV of rails - preserves >2.8V dynamic range at 3.3V supply for 12-bit ADC interfacing. |
| Open-Loop Gain | 90dB (min 74dB) - ensures <0.1% gain error in unity-gain buffers driving 1MΩ loads. |
Pinout & Package
OPA2349UAG4 is housed in an SO-8 surface-mount package (Package Drawing D), 4.9mm × 3.9mm × 1.75mm, RoHS-compliant, MSL Level-2-260°C-1 year, with NIPDAU lead finish. Pin 1 marked by index area; tape-and-reel packaging (2500 units/reel).
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | +In A | Non-inverting input of amplifier A - accepts rail-to-rail common-mode signals including below V– and above V+. |
| 2 | –In A | Inverting input of amplifier A - used for feedback in inverting configurations or reference in non-inverting setups. |
| 3 | Out A | Amplifier A output - drives capacitive loads up to 500pF with controlled overshoot; swings to within 350mV of rails. |
| 4 | V– | Negative supply pin - connects to ground or negative rail; all inputs/outputs referenced to this node. |
| 5 | Out B | Amplifier B output - independent channel for dual-signal paths (e.g., differential sensor pair amplification). |
| 6 | –In B | Inverting input of amplifier B - supports separate feedback network for second channel. |
| 7 | +In B | Non-inverting input of amplifier B - enables simultaneous processing of two analog channels with identical micropower performance. |
| 8 | V+ | Positive supply pin - accepts 1.8V–5.5V; requires 0.01µF ceramic bypass capacitor to ground per TI application guidance. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input with 200mV beyond rails | Enables direct measurement of transducer outputs near supply extremes without level-shifting circuitry. |
| Unity-gain stable, no external compensation | Reduces BOM count and PCB area in buffer, filter, and sensor interface designs - no stability tuning required. |
| 1µA quiescent current per amplifier | Extends battery life in always-on smoke/fire detection systems where standby current dominates lifetime energy budget. |
| 70kHz GBW with 0.02V/µs slew rate | Supports accurate amplification of DC–10kHz physiological signals (e.g., ECG leads) while rejecting high-frequency noise. |
| Specified –40°C to +70°C operating range | Validates performance across automotive cabin, industrial field, and outdoor environmental monitoring deployments. |
Applications
| Battery-Powered Smoke Detection | Solar-Powered Remote Sensor Node |
|---|---|
Use Scenario: Continuous monitoring of ionization chamber current in residential smoke alarms powered by 9V alkaline batteries. IC Role / Device Role / Timing Role: Precision current-to-voltage conversion and low-pass filtering of ultra-low-level chamber current (sub-pA). Use Value: 10pA max input bias current prevents signal corruption; 1µA quiescent current extends alarm battery life beyond 10 years. | Use Scenario: Signal conditioning for temperature/humidity sensors in off-grid agricultural telemetry units powered by 3.7V LiPo + solar charge management. IC Role / Device Role / Timing Role: Dual-channel rail-to-rail amplification of RTD and capacitive humidity sensor outputs prior to 12-bit SAR ADC sampling. Use Value: Dual configuration reduces component count; 1.8V minimum supply allows operation during low-light solar charging cycles. |
| Portable Medical Pulse Oximeter | PCMCIA Card Analog Interface |
Use Scenario: Front-end amplification of red/IR photodiode currents in handheld pulse oximeters using AAA batteries. IC Role / Device Role / Timing Role: Low-noise transimpedance amplification and DC offset removal for synchronized LED drive and photodiode readout. Use Value: 300nV/√Hz input voltage noise density preserves SNR; rail-to-rail output swing maximizes ADC utilization at 3.3V supply. | Use Scenario: Analog signal routing and level adaptation in legacy PCMCIA cards for data acquisition in industrial laptops. IC Role / Device Role / Timing Role: Dual op-amp providing programmable gain and output buffering between card-edge connector and onboard ADC/DAC. Use Value: SO-8 footprint matches standard PCMCIA layout constraints; 70kHz bandwidth supports 10ksps sampling with anti-aliasing. |
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 | Same 1µA IQ, but 5.5kHz GBW (vs 70kHz); lower 70dB open-loop gain; 100pA IB (vs 10pA). | Not suitable for A/D driver or filter applications requiring >10kHz bandwidth or high-precision gain accuracy. | Select TLV2402IDR only when bandwidth demand is ≤5kHz and cost sensitivity outweighs precision requirements. |
| OPA2347UA | 20µA IQ (20× higher), 350kHz GBW, same SO-8 package; 10pA IB retained; wider 1.8V–5.5V supply. | Acceptable where higher speed or faster settling is needed, but incompatible with multi-year battery life targets. | Choose OPA2347UA when system requires faster response (e.g., active filters) and can tolerate 20× higher quiescent current. |
Compared with TLV2402IDR and OPA2347UA, the OPA2349UAG4 uniquely balances ultra-low power (1µA), usable bandwidth (70kHz), and precision (10pA IB, 90dB AOL) in a single SO-8 solution - making it optimal for long-life, space-constrained, single-supply sensor interfaces where every nanoamp counts.
Availability
OPA2349UAG4 is available at Aetrix Electronics and suitable for battery packs, portable medical devices, and remote environmental sensors requiring stable component supply with guaranteed long-term manufacturability and traceable sourcing.
Supply support for OPA2349UAG4 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 for industrial, automotive, personal electronics, and communications markets.
The OPA2349UAG4 belongs to TI's precision micropower op amp product line, engineered specifically for ultra-low-power signal conditioning in battery-operated and energy-harvesting systems where extended operational lifetime and rail-to-rail functionality are critical design requirements.
FAQ
What is the maximum operating temperature range specified for the OPA2349UAG4?
The OPA2349UAG4 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 ensures reliable performance in automotive cabin modules, outdoor environmental sensors, and factory-floor instrumentation where ambient conditions vary widely. The device maintains its 1µA quiescent current and 70kHz gain-bandwidth across this full range, as verified in TI's SBOS121B datasheet electrical characteristics tables.
Does the OPA2349UAG4 require external compensation for unity-gain stability?
No, the OPA2349UAG4 is internally compensated and unity-gain stable - no external capacitors or resistors are needed for stable operation at gain = 1. This is confirmed in the device's "FEATURES" list and "APPLICATIONS INFORMATION" section, which explicitly states "unity-gain stable and require no external compensation." Engineers can directly implement voltage followers, active filters, or sensor buffers without stability analysis or layout iteration, reducing design cycle time for portable instrumentation.
What is the input common-mode voltage range of the OPA2349UAG4, and why does it matter?
The OPA2349UAG4 features a rail-to-rail input stage with a common-mode range from (V–) – 0.2V to (V+) + 0.2V - extending 200mV beyond both supply rails. This allows direct amplification of sensor signals that swing below ground or above V+, such as piezoelectric transducers or bridge circuits in single-supply systems. However, TI documentation notes a 400mV transition region where both N- and P-channel input pairs are active, potentially degrading CMRR and THD; thus, optimal performance is achieved when the common-mode voltage remains outside this region.
Can the OPA2349UAG4 drive capacitive loads, and what is the recommended layout practice?
Yes, the OPA2349UAG4 can drive capacitive loads up to 500pF with controlled overshoot, as shown in typical characteristic curves for SOT23/SO-8 packages. TI recommends using a 0.01µF ceramic bypass capacitor between V+ and V– pins, placed as close as possible to the device. For loads >100pF, adding a small series resistor (10–50Ω) between the output and capacitive load helps isolate the amplifier from reactive feedback and improves stability - a technique validated in the "APPLICATIONS INFORMATION" section of the SBOS121B datasheet.
Is the OPA2349UAG4 pin-compatible with other dual op amps in SO-8 packages like the LM358 or TL072?
No, the OPA2349UAG4 is not pin-compatible with LM358 or TL072. Its SO-8 pinout is: Pin 1 = +In A, Pin 2 = –In A, Pin 3 = Out A, Pin 4 = V–, Pin 5 = Out B, Pin 6 = –In B, Pin 7 = +In B, Pin 8 = V+. In contrast, LM358 uses Pin 2 = –In A, Pin 3 = +In A, Pin 1 = Out A - a reversed input assignment. Substituting without PCB revision would cause functional failure. Always verify pin mapping using TI's official OPA2349UAG4 datasheet before board layout or replacement.
OPA2349UAG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Discontinued at Digi-Key
- 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
OPA2349UAG4 FAQ
1.How can I place an order for OPA2349UAG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA2349UAG4 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 OPA2349UAG4 reliable?
The price and inventory of OPA2349UAG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA2349UAG4 is usually 5 days.
3.What payment methods are accepted for OPA2349UAG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA2349UAG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA2349UAG4?
OPA2349UAG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA2349UAG4 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 OPA2349UAG4?
For technical support, including OPA2349UAG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA2349UAG4 requirements.
6.How does Aetrix verify that OPA2349UAG4 is sourced from the original manufacturer or authorized distributors?
All OPA2349UAG4 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 OPA2349UAG4 meets industry standards.
7.What is the process for return or replacement of OPA2349UAG4?
All OPA2349UAG4 units undergo pre-shipment inspection (PSI). If there is an issue with OPA2349UAG4, 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 OPA2349UAG4 part is unused and in its original packaging.
Return procedure for OPA2349UAG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
OPA2349UAG4 Tags
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