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Texas Instruments OPA347SA/3K
- Part No.:
- OPA347SA/3K
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
OPA347SA/3K.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT SC70-5
- Quantity:
- Payment:
- Shipping:
Inventory:58,390
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Product details
Overview
OPA347SA/3K from Texas Instruments is a single-channel, microPower rail-to-rail input/output operational amplifier in SC-70-5 package. It delivers 350kHz bandwidth, 20µA quiescent current, and operates from 2.4V to 5.5V supply - optimized for battery-powered smoke detectors and 2-wire transmitters.
For engineers reviewing the OPA347SA/3K datasheet, OPA347SA/3K pinout, OPA347SA/3K application, or OPA347SA/3K equivalent, key selection criteria include ultra-low IQ, rail-to-rail swing within 5mV of rails at light loads, input common-mode range extending 200mV beyond supplies, and guaranteed operation from –55°C to +125°C.
Technical Context
The OPA347SA/3K uses a complementary differential input stage (N- and P-channel pairs) enabling rail-to-rail input operation with a 400mV transition region where both pairs conduct. Its class AB output stage supports rail-to-rail output swing down to 5mV from rails under 100kΩ load.
It is unity-gain stable and specified for single-supply operation; input bias current is ±0.5pA typical, open-loop gain is ≥100dB at 5.5V with 100kΩ load, and PSRR/CMRR are characterized across voltage and temperature for precision low-voltage signal conditioning.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Quiescent Current | 20µA per amplifier - enables multi-year battery life in portable CO/smoke detectors. |
| Supply Voltage Range | 2.4V to 5.5V - supports direct operation from single Li-ion or two alkaline cells. |
| Gain-Bandwidth Product | 350kHz - sufficient for sensor buffering and 12-bit ADC driving up to ~10ksps sampling. |
| Input Common-Mode Range | (V–) – 0.2V to (V+) + 0.2V - allows sensing signals below ground or above V+ in single-supply systems. |
| Output Voltage Swing | Within 5mV of rails (RL = 100kΩ) - maximizes dynamic range in low-voltage data acquisition. |
| Input Offset Voltage | 2mV (typ), 6mV (max) - suitable for DC-coupled sensor interfaces without trimming. |
| Operating Temperature | –55°C to +125°C - qualified for industrial and automotive under-hood sensor modules. |
Pinout & Package
OPA347SA/3K is packaged in SC-70-5 (DCK), a 1.25mm × 2.0mm surface-mount package with 0.65mm pitch, optimized for space-constrained portable designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (V–) | Negative supply / ground reference | Connects to system ground or negative rail; supports single-supply operation down to 2.4V. |
| 2 (+In) | Non-inverting input | Differential input node with ±0.5pA bias current; accepts signals from (V–) – 0.2V to (V+) + 0.2V. |
| 3 (–In) | Inverting input | Differential input node; used in inverting configurations or feedback networks with matched impedance. |
| 4 (Out) | Amplifier output | Class AB rail-to-rail output capable of sourcing/sinking ±17mA; swings to within 5mV of rails at light loads. |
| 5 (V+) | Positive supply | Accepts 2.4V–5.5V; requires 0.01µF ceramic bypass capacitor to ground for stability. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input and output | Enables full-scale signal utilization in 2.4V–5.5V single-supply systems, critical for maximizing SNR in low-voltage sensor front-ends. |
| 20µA quiescent current | Reduces average power to <100µW at 5V, extending battery life in always-on smoke/CO detectors. |
| Unity-gain stable | Eliminates need for external compensation in buffer, follower, or gain-of-one configurations - simplifies PCB layout. |
| Specified from –55°C to +125°C | Validated performance across extended industrial temperature range, supporting deployment in harsh environments. |
| SC-70-5 package | 1.25mm × 2.0mm footprint saves >50% board area vs SO-8; compatible with standard reflow assembly. |
Applications
| Smoke Detectors | 2-Wire Transmitters |
|---|---|
Use Scenario: Amplifying ionization chamber or photoelectric sensor output in battery-powered residential/commercial smoke alarms. IC Role / Device Role / Timing Role: Precision DC-coupled transimpedance or differential amplifier conditioning weak sensor currents. Use Value: 20µA IQ enables >5-year battery life; rail-to-rail I/O captures full sensor dynamic range at 3V supply. | Use Scenario: Signal conditioning and loop-driver interface in 4–20mA industrial process transmitters powered from 2-wire loop. IC Role / Device Role / Timing Role: Low-power sensor front-end amplifier and voltage-to-current converter input stage. Use Value: 2.4V min operating voltage allows operation during loop voltage sag; 350kHz GBW supports fast step response in control loops. |
| Battery-Powered Equipment | Portable Medical Sensors |
Use Scenario: Front-end amplification in handheld glucose meters, pulse oximeters, or portable gas analyzers. IC Role / Device Role / Timing Role: Rail-to-rail input buffer for electrochemical or optical sensor outputs prior to ADC sampling. Use Value: Input extends 200mV beyond rails - accommodates sensor offset drift without clipping; SC-70-5 enables miniaturized PCBs. | Use Scenario: Biopotential signal amplification (e.g., ECG lead-off detection, respiration monitoring) in wearable diagnostic patches. IC Role / Device Role / Timing Role: Ultra-low-power instrumentation amplifier input stage or reference buffer. Use Value: 0.5pA input bias current minimizes electrode polarization error; 125°C rating supports sterilization cycle compatibility. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA348SA/3K | Higher 450kHz GBW, same 20µA IQ and SC-70-5 package; improved CMRR (90dB typ). | Better suited for higher-frequency sensor signals (e.g., ultrasonic transducers) requiring tighter common-mode rejection. | Select OPA348SA/3K when bandwidth >350kHz or CMRR >80dB is required; otherwise OPA347SA/3K offers cost-optimized performance. |
| MCP6001T-E/OT | 25µA IQ, 1MHz GBW, SC-70-5; wider 1.8V–6.0V supply range but lower temp grade (–40°C to +125°C). | Preferred for consumer-grade portable devices where extended temp range is not mandatory and higher speed is beneficial. | Choose MCP6001T-E/OT for cost-sensitive, non-industrial designs needing faster settling; OPA347SA/3K remains superior for extended temperature and ultra-low IQ. |
Compared with OPA348SA/3K and MCP6001T-E/OT, the OPA347SA/3K uniquely balances ultra-low 20µA quiescent current, rail-to-rail operation down to 2.4V, and full –55°C to +125°C qualification - making it the optimal choice for safety-critical, long-life battery-powered industrial sensors.
Availability
OPA347SA/3K is available at Aetrix Electronics and suitable for smoke detectors, 2-wire transmitters, and portable medical sensors requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for OPA347SA/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 OPA347 series belongs to TI's microPower rail-to-rail op amp product line, designed specifically for energy-constrained, space-limited sensor signal conditioning in industrial safety, portable instrumentation, and battery-operated IoT endpoints.
FAQ
What is the minimum operating voltage for OPA347SA/3K?
The OPA347SA/3K has a minimum operating voltage of 2.4V, as explicitly specified in the Electrical Characteristics table for the SC-70 package variant. This allows reliable operation from partially discharged lithium coin cells or two-series alkaline batteries, making it ideal for long-life portable safety devices like smoke detectors.
Does OPA347SA/3K support rail-to-rail input and output simultaneously?
Yes, the OPA347SA/3K supports true rail-to-rail input (from V– – 0.2V to V+ + 0.2V) and rail-to-rail output (within 5mV of rails at 100kΩ load). Its complementary input stage and class AB output stage enable full dynamic range utilization in single-supply systems - a key requirement for precision sensor interfaces in OPA347SA/3K-based designs.
What is the thermal resistance (θJA) of the OPA347SA/3K SC-70-5 package?
The OPA347SA/3K in SC-70-5 (DCK) package has a junction-to-ambient thermal resistance (θJA) of 250°C/W, as documented in the Thermal Resistance table. This value assumes standard JEDEC 2-layer board conditions; designers should verify PCB copper pour and airflow in high-temperature environments to maintain junction temperature ≤150°C.
Can OPA347SA/3K drive capacitive loads directly?
The OPA347SA/3K can directly drive up to 250pF of pure capacitive load in unity-gain configuration without instability. For larger loads or inverting configurations, a small series resistor (10Ω–20Ω) at the output or feedback capacitor (4pF–6pF) is recommended - guidance confirmed in the Applications Information section of the OPA347SA/3K datasheet.
Is OPA347SA/3K qualified for automotive applications?
The OPA347SA/3K is not AEC-Q200 qualified, but it is fully specified and tested from –55°C to +125°C - exceeding the temperature range of many automotive cabin and under-hood applications. While not certified for safety-critical automotive subsystems, its extended temp rating makes it suitable for non-safety automotive sensors where OPA347SA/3K's ultra-low IQ and rail-to-rail performance are advantageous.
OPA347SA/3K Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 5-TSSOP, SC-70-5, SOT-353
- 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:
- 17 mA
- Voltage - Supply Span (Min):
- 2.4 V
- Voltage - Supply Span (Max):
- 5.5 V
- Operating Temperature:
- -55°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-5
OPA347SA/3K FAQ
1.How can I place an order for OPA347SA/3K through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA347SA/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 OPA347SA/3K reliable?
The price and inventory of OPA347SA/3K are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA347SA/3K is usually 5 days.
3.What payment methods are accepted for OPA347SA/3K?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA347SA/3K transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA347SA/3K?
OPA347SA/3K orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA347SA/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 OPA347SA/3K?
For technical support, including OPA347SA/3K datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA347SA/3K requirements.
6.How does Aetrix verify that OPA347SA/3K is sourced from the original manufacturer or authorized distributors?
All OPA347SA/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 OPA347SA/3K meets industry standards.
7.What is the process for return or replacement of OPA347SA/3K?
All OPA347SA/3K units undergo pre-shipment inspection (PSI). If there is an issue with OPA347SA/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 OPA347SA/3K part is unused and in its original packaging.
Return procedure for OPA347SA/3K:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
OPA347SA/3K Tags
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LM358DT
STMicroelectronics
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LM358DR
Texas Instruments
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LM2904DR
Texas Instruments
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LM358ADR
Texas Instruments
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LM2904DGKR
Texas Instruments
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LM324DR
Texas Instruments
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MCP6006T-E/OT
Microchip Technology
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MCP6006UT-E/OT
Microchip Technology
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LM324PWR
Texas Instruments
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LM2902PWR
Texas Instruments
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LM2902DR
Texas Instruments
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LM358P
Texas Instruments
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