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Texas Instruments OPA347SA/250
- Part No.:
- OPA347SA/250
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
OPA347SA/250.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT SC70-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,659
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Product details
Overview
OPA347SA/250 from Texas Instruments is a single-channel, microPower rail-to-rail input/output operational amplifier in SC70-5 package. It delivers 350kHz gain-bandwidth, 20µA quiescent current, and operates from 2.4V to 5.5V supply - optimized for battery-powered smoke detectors and 2-wire transmitters where low power and wide dynamic range are critical.
For engineers reviewing the OPA347SA/250 datasheet, OPA347SA/250 pinout, OPA347SA/250 application, or OPA347SA/250 equivalent, key selection criteria include its 5mV rail-to-rail output swing at light loads, ±0.5pA input bias current at 25°C, and guaranteed operation across –55°C to +125°C industrial temperature range.
Technical Context
The OPA347SA/250 uses a complementary differential input stage (N- and P-channel pairs) enabling rail-to-rail common-mode input range extending 200mV beyond both rails. Its class AB output stage achieves 5mV output swing from rails under 100kΩ load while maintaining >100dB open-loop gain.
It is unity-gain stable and specified for capacitive load drive up to 250pF in buffer configuration. Input voltage noise is 60nV/√Hz at 1kHz, and input bias current remains below ±10pA over temperature - critical for high-impedance sensor interfaces in portable equipment.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.4V to 5.5V - supports single-cell Li-ion and dual-cell alkaline systems without regulation. |
| Quiescent Current | 20µA typical - enables multi-year battery life in CO detectors and wireless sensors. |
| Gain-Bandwidth Product | 350kHz - sufficient for conditioning slow-varying gas sensor outputs and thermistor signals. |
| Input Offset Voltage | 2mV max at 25°C - ensures <0.1% error in 2-wire transmitter current loop amplification. |
| Rail-to-Rail Output Swing | Within 5mV of rails (RL = 100kΩ) - maximizes ADC input dynamic range in 3.3V systems. |
| Input Bias Current | ±0.5pA typical - preserves signal integrity in high-Z pH or ion-selective electrode front-ends. |
| Operating Temperature | –55°C to +125°C - qualified for automotive cabin and industrial process monitoring environments. |
Pinout & Package
OPA347SA/250 is packaged in SC70-5 (DCK), a 1.6mm × 1.6mm surface-mount package with 0.65mm pitch. Thermal resistance θJA is 250°C/W.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | V− | Negative supply or ground reference - must be bypassed with 0.01µF ceramic capacitor. |
| 2 | In− | Inverting input - high-impedance node sensitive to PCB leakage; requires guard ring in precision designs. |
| 3 | In+ | Non-inverting input - accepts signals from (V−) − 0.2V to (V+) + 0.2V, enabling true rail-to-rail sensing. |
| 4 | Out | Amplified output - drives 5kΩ loads to within 125mV of rails; stable with ≤250pF capacitive load. |
| 5 | V+ | Positive supply - minimum 2.4V operation confirmed for OPA347SA variant per datasheet Table 1. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input | Common-mode range extends 200mV beyond both supply rails - eliminates level-shifting in single-supply sensor buffers. |
| Rail-to-rail output | Swings to within 5mV of V+ and V− with 100kΩ load - preserves full-scale resolution when driving 12-bit ADCs. |
| Ultra-low IQ | 20µA quiescent current - reduces average power to <100µW at 5V, critical for coin-cell-powered smoke alarms. |
| Unity-gain stable | No external compensation required - simplifies layout in non-inverting gain-of-2 configurations for transmitter I/V conversion. |
| High CMRR | 70dB min over full common-mode range - rejects supply ripple and EMI in noisy industrial 2-wire loops. |
Applications
| Smoke Detectors | 2-Wire Transmitters |
|---|---|
|
Use Scenario: Amplifying low-current ionization chamber output in battery-operated residential smoke alarms. IC Role / Device Role / Timing Role: Precision current-to-voltage converter with rail-to-rail input enabling detection of sub-picoampere smoke-induced currents. Use Value: 20µA IQ extends AA battery life beyond 10 years; 5mV output swing maximizes SNR into 8-bit MCU ADC. |
Use Scenario: Conditioning sensor signals in 4–20mA loop-powered industrial pressure/temperature transmitters. IC Role / Device Role / Timing Role: Low-drift, low-power signal conditioner in the analog front-end before DAC and loop driver stages. Use Value: 2mV offset voltage ensures <0.01% FSR error in 16mA span; –55°C to +125°C rating supports field deployment in harsh environments. |
| Battery-Powered Sensors | CO Detectors |
|
Use Scenario: Buffering thermistor or RTD outputs in handheld gas analyzers powered by CR2032 coin cells. IC Role / Device Role / Timing Role: High-impedance voltage follower isolating sensor from ADC input capacitance and charge injection. Use Value: ±0.5pA input bias current prevents thermistor self-heating errors; SC70-5 footprint saves >60% board area vs SO-8. |
Use Scenario: Amplifying electrochemical cell output in portable carbon monoxide monitors. IC Role / Device Role / Timing Role: Ultra-low-power transimpedance amplifier converting nA-level CO oxidation current to measurable voltage. Use Value: 60nV/√Hz input noise maintains resolution for <10ppm CO detection; 2.4V min supply enables direct connection to single LiFePO₄ cell. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP6001T-E/OT | Higher IQ (100µA), lower GBW (1MHz), same SC70-5 package and rail-to-rail I/O. | Less suitable for multi-year battery life; better for higher-speed sensor sampling. | Select MCP6001T-E/OT only if bandwidth >500kHz is required and power budget allows 5× higher IQ. |
| LTC1540CS5#TRMPBF | Lower IQ (1µA), no rail-to-rail output, SOT23-5 package, 10kHz GBW. | Optimized for ultra-low-power comparators or micropower references, not linear amplification. | Choose LTC1540CS5#TRMPBF only for comparator-based threshold detection - not as op-amp replacement. |
Compared with MCP6001T-E/OT and LTC1540CS5#TRMPBF, the OPA347SA/250 uniquely balances 350kHz bandwidth, 20µA IQ, and true rail-to-rail I/O in SC70-5 - making it the only option meeting simultaneous requirements for battery-life-critical 2-wire transmitters and low-noise CO detector front-ends.
Availability
OPA347SA/250 is available at Aetrix Electronics and suitable for smoke detectors, 2-wire transmitters, and CO detectors requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for OPA347SA/250 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 was designed specifically for ultra-low-power, rail-to-rail signal conditioning in portable and battery-operated safety-critical systems - emphasizing longevity, accuracy, and robustness over wide temperature extremes.
FAQ
What is the minimum supply voltage for OPA347SA/250?
The OPA347SA/250 has a minimum operating voltage of 2.4V, as explicitly specified in the Electrical Characteristics table of the SBOS167D datasheet. This is distinct from other OPA347 variants (e.g., OPA347NA) which specify 2.3V minimum. The 2.4V rating ensures reliable rail-to-rail performance and guaranteed specifications across –55°C to +125°C.
Does OPA347SA/250 support rail-to-rail input and output simultaneously?
Yes, the OPA347SA/250 supports rail-to-rail input (VCM = V− − 0.2V to V+ + 0.2V) and rail-to-rail output (within 5mV of rails with 100kΩ load). Its complementary input stage and class AB output stage enable full dynamic range utilization in single-supply 3.3V or 5V systems - essential for maximizing ADC resolution in portable equipment.
What is the thermal resistance (θJA) of OPA347SA/250 in SC70-5 package?
The OPA347SA/250 in SC70-5 (DCK) package has a junction-to-ambient thermal resistance (θJA) of 250°C/W, as documented in the Thermal Resistance table on page 4 of SBOS167D. This value reflects standard JEDEC high-K test board conditions and informs thermal design for continuous operation at maximum ambient temperatures.
Can OPA347SA/250 drive capacitive loads without oscillation?
Yes, the OPA347SA/250 is unity-gain stable and can directly drive up to 250pF of pure capacitive load in buffer configuration. For larger loads or inverting configurations, stability is improved using a 10Ω–20Ω series resistor at the output or a 4pF–6pF feedback capacitor - methods validated in the Applications Information section of the datasheet.
Is OPA347SA/250 suitable for driving 12-bit ADC inputs?
Yes, the OPA347SA/250 is optimized for driving medium-speed sampling ADCs like the ADS7822. Its 5mV rail-to-rail output swing, 60nV/√Hz input voltage noise, and 350kHz bandwidth ensure minimal settling error and preserved SNR - demonstrated in Figure 8 of SBOS167D with full schematic and performance data.
OPA347SA/250 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/250 FAQ
1.How can I place an order for OPA347SA/250 through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA347SA/250 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/250 reliable?
The price and inventory of OPA347SA/250 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA347SA/250 is usually 5 days.
3.What payment methods are accepted for OPA347SA/250?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA347SA/250 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA347SA/250?
OPA347SA/250 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA347SA/250 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/250?
For technical support, including OPA347SA/250 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA347SA/250 requirements.
6.How does Aetrix verify that OPA347SA/250 is sourced from the original manufacturer or authorized distributors?
All OPA347SA/250 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/250 meets industry standards.
7.What is the process for return or replacement of OPA347SA/250?
All OPA347SA/250 units undergo pre-shipment inspection (PSI). If there is an issue with OPA347SA/250, 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/250 part is unused and in its original packaging.
Return procedure for OPA347SA/250:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
OPA347SA/250 Tags
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LM358DT
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LM358DR
Texas Instruments
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