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Texas Instruments OPA347NA/3K
- Part No.:
- OPA347NA/3K
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SC-74A, SOT-753
- Datasheet:
-
OPA347NA/3K.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,347
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Product details
Overview
OPA347NA/3K from Texas Instruments is a single-channel, microPower rail-to-rail input/output operational amplifier in SOT-23-5 package. It delivers 350kHz gain-bandwidth, 20µA quiescent current, and operates from 2.3V to 5.5V single supply - optimized for battery-powered smoke detectors and 2-wire transmitters.
For engineers reviewing the OPA347NA/3K datasheet, OPA347NA/3K pinout, OPA347NA/3K application, or OPA347NA/3K equivalent, key selection criteria include ultra-low IQ, rail-to-rail I/O swing within 5mV of rails at light loads, –55°C to +125°C operation, and verified performance in portable sensor signal conditioning.
Technical Context
The OPA347NA/3K uses a complementary differential input stage enabling rail-to-rail common-mode input range extending 200mV beyond both supply rails. Its class AB output stage achieves rail-to-rail output swing - typically within 5mV of V+ or V– with 100kΩ load and >100dB open-loop gain.
It is unity-gain stable and specified across full industrial temperature range (–55°C to +125°C) with guaranteed performance at 2.5V to 5.5V supply. Input bias current is ±0.5pA typical, and PSRR/CMRR remain ≥70dB over most of the input voltage range excluding the 400mV transition region near V+.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.3V to 5.5V single supply - supports direct integration into 3V and 5V battery-powered systems without level-shifting. |
| Quiescent Current | 20µA typical per amplifier - enables multi-year operation on coin-cell batteries in low-duty-cycle sensors. |
| Gain-Bandwidth Product | 350kHz - sufficient for buffering 12-bit ADCs like ADS7822 and anti-aliasing filtering in sub-100kHz sensor front-ends. |
| Input Common-Mode Range | (V–) – 0.2V to (V+) + 0.2V - allows direct sensing of signals near ground or rail, critical for single-supply transducer interfaces. |
| Output Voltage Swing | Within 5mV of rails (RL = 100kΩ) - maximizes dynamic range in low-voltage systems, e.g., 0–5V output from 5V supply. |
| Input Offset Voltage | 2mV typical (max 6mV) - ensures <0.1% error in 2-wire transmitter current-loop amplification stages. |
| Operating Temperature | –55°C to +125°C - qualified for under-hood automotive, industrial fire detection, and outdoor environmental monitoring. |
Pinout & Package
SOT-23-5 surface-mount package (DBV drawing), 2.9mm × 1.6mm footprint, moisture sensitivity level (MSL) Level-2 (260°C peak reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUT) | Amplifier output | Class AB rail-to-rail driver capable of sourcing/sinking ±17mA; requires 0.01µF bypass capacitor on V+ for stability. |
| 2 (–IN) | Inverting input | High-impedance node (10¹³ Ω || 6pF); accepts inputs up to 0.5V beyond rails if current-limited to ≤10mA. |
| 3 (+IN) | Non-inverting input | Same high-Z specification as –IN; common-mode range extends 200mV beyond rails - enables true single-supply DC-coupled sensing. |
| 4 (V–) | Negative supply / ground reference | Must be connected directly to system ground or negative rail; not internally tied to substrate - supports dual-supply operation. |
| 5 (V+) | Positive supply | Accepts 2.3V–5.5V; bypassing with 0.01µF ceramic capacitor is mandatory to suppress supply noise and ensure stability. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input and output | Enables full-scale signal utilization in 2.3V–5.5V systems - eliminates need for level-shifting or dual supplies in portable gas detectors. |
| 20µA quiescent current | Reduces average power to <100µW at 5V - extends battery life in intermittent-sampling smoke alarms beyond 5 years. |
| 350kHz bandwidth at ultra-low power | Supports fast settling (21µs to 0.1%) for 12-bit ADC driving - meets timing requirements of ADS7822 without external compensation. |
| Specified from –55°C to +125°C | Validates performance in harsh environments - e.g., HVAC duct-mounted CO sensors or industrial 2-wire loop transmitters. |
| Input bias current ≤10pA | Minimizes voltage error across high-impedance sensor bridges (e.g., thermopiles, electrochemical cells) without requiring guard traces. |
Applications
| Smoke Detectors | 2-Wire Transmitters |
|---|---|
Use Scenario: Amplifying ionization chamber current (pA–nA range) in battery-powered residential smoke alarms. IC Role / Device Role / Timing Role: Low-noise, rail-to-rail transimpedance amplifier with 20µA IQ, converting chamber current to measurable voltage while preserving DC accuracy. Use Value: Enables >5-year coin-cell operation and reliable detection down to 0.5% obscuration due to ultra-low input bias (±0.5pA) and offset drift (3µV/°C). | Use Scenario: Conditioning sensor output and driving 4–20mA loop in industrial pressure/temperature transmitters. IC Role / Device Role / Timing Role: Precision buffer and gain stage operating from loop-derived 24V (regulated to 5V), interfacing with DAC and current-sense resistor. Use Value: Rail-to-rail I/O and 2mV max offset ensure full 4–20mA span utilization; 350kHz GBW supports fast loop response (<100µs settling) during fault conditions. |
| Battery-Powered Equipment | Portable Gas Sensors |
Use Scenario: Signal conditioning for handheld multimeters, portable data loggers, and wearable health monitors. IC Role / Device Role / Timing Role: General-purpose rail-to-rail op amp for sensor buffering, filtering, and level-shifting in space-constrained PCBs. Use Value: SOT-23-5 footprint and 20µA IQ reduce board area and power budget - critical for AA/AAA-powered devices with 10+ year shelf life. | Use Scenario: Amplifying low-level output from electrochemical CO or NO₂ sensors in portable air quality meters. IC Role / Device Role / Timing Role: Ultra-low-input-current amplifier for high-impedance sensor electrodes, rejecting common-mode interference in noisy environments. Use Value: ±0.5pA input bias prevents polarization of sensor electrodes; CMRR ≥70dB rejects EMI from Bluetooth/WiFi modules co-located on same PCB. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV2461IDBVR | Higher IQ (230µA), 6.4MHz GBW, same SOT-23-5 package | Better speed but 11× higher power - unsuitable for multi-year battery life; preferred for active filters or higher-bandwidth sensor interfaces. | Select TLV2461IDBVR only when bandwidth >1MHz is required and power budget allows ≥200µA per channel. |
| LPV821DBVR | Lower IQ (650nA), 10kHz GBW, same SOT-23-5 package | Ultra-low-power but insufficient bandwidth for ADC driving or fast transients - best for nanoampere leakage measurement or ultra-long-life IoT endpoints. | Choose LPV821DBVR when quiescent current is the dominant constraint and signal bandwidth is <1kHz. |
Compared with TLV2461IDBVR and LPV821DBVR, the OPA347NA/3K uniquely balances 350kHz bandwidth and 20µA IQ in SOT-23-5 - making it optimal for 12-bit sensor interfaces where both speed and multi-year battery life are required.
Availability
OPA347NA/3K is available at Aetrix Electronics and suitable for smoke detectors, 2-wire transmitters, and portable gas sensors requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for OPA347NA/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 leader specializing in analog and embedded processing technologies, with decades of expertise in precision op amps and low-power signal chains.
The OPA347NA/3K belongs to TI's microPower rail-to-rail op amp family, designed specifically for energy-constrained sensor signal conditioning in safety-critical and industrial monitoring applications.
FAQ
What is the maximum operating temperature range for the OPA347NA/3K?
The OPA347NA/3K is fully specified from –55°C to +125°C and rated for operation up to +150°C. This extended range ensures reliability in under-hood automotive sensors, industrial furnace controllers, and outdoor fire detection systems where ambient temperatures exceed standard commercial limits. The OPA347NA/3K maintains its 20µA quiescent current and 350kHz bandwidth across this full range.
Can the OPA347NA/3K drive a capacitive load without oscillation?
Yes, the OPA347NA/3K is unity-gain stable and can directly drive up to 250pF of pure capacitive load. For larger loads or improved phase margin, add a 10Ω–20Ω series resistor between the output and capacitive node. This preserves DC accuracy while eliminating ringing - a proven technique validated in TI's SBOS167D datasheet Figure 6 for OPA347NA/3K-based ADC drivers.
Does the OPA347NA/3K support single-supply operation below 2.5V?
Yes, the OPA347NA/3K operates down to 2.3V supply voltage, making it compatible with single-cell Li-ion (3.0–4.2V) and two-cell alkaline (2.4–3.2V) systems. The minimum operating voltage is explicitly guaranteed in the datasheet, and rail-to-rail I/O ensures usable dynamic range even at 2.3V - critical for brown-out tolerant smoke detector designs.
What is the input common-mode voltage range of the OPA347NA/3K?
The OPA347NA/3K features a rail-to-rail input stage with common-mode range from (V–) – 0.2V to (V+) + 0.2V. This allows direct interface with sensors whose output swings below ground or above V+, provided input current is limited to ≤10mA. The extended range eliminates level-shifting circuitry in battery-powered CO detectors and 2-wire transmitter front-ends.
How does the OPA347NA/3K compare to the OPA347SA variant?
The OPA347NA/3K (SOT-23-5, DBV) and OPA347SA (SC-70-5, DCK) share identical electrical specifications but differ in package thermal and mechanical properties. The OPA347NA/3K has θJA = 200°C/W and MSL Level-2, while OPA347SA has θJA = 250°C/W and MSL Level-1. Choose OPA347NA/3K for higher power dissipation tolerance and standard reflow compatibility; choose OPA347SA only when board space is extremely constrained.
OPA347NA/3K Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 1
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 0.17V/µs
- Gain Bandwidth Product:
- 350 kHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 0.5 pA
- Voltage - Input Offset:
- 2 mV
- Current - Supply:
- 20µA
- Current - Output / Channel:
- -
- Voltage - Supply Span (Min):
- 2.3 V
- Voltage - Supply Span (Max):
- 5.5 V
- Operating Temperature:
- -55°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
OPA347NA/3K FAQ
1.How can I place an order for OPA347NA/3K through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA347NA/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 OPA347NA/3K reliable?
The price and inventory of OPA347NA/3K are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA347NA/3K is usually 5 days.
3.What payment methods are accepted for OPA347NA/3K?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA347NA/3K transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA347NA/3K?
OPA347NA/3K orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA347NA/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 OPA347NA/3K?
For technical support, including OPA347NA/3K datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA347NA/3K requirements.
6.How does Aetrix verify that OPA347NA/3K is sourced from the original manufacturer or authorized distributors?
All OPA347NA/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 OPA347NA/3K meets industry standards.
7.What is the process for return or replacement of OPA347NA/3K?
All OPA347NA/3K units undergo pre-shipment inspection (PSI). If there is an issue with OPA347NA/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 OPA347NA/3K part is unused and in its original packaging.
Return procedure for OPA347NA/3K:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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