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Texas Instruments OPA347SA/3KG4
- Part No.:
- OPA347SA/3KG4
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
OPA347SA/3KG4.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT SC70-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,515
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Product details
Overview
OPA347SA/3KG4 from Texas Instruments is a single-channel, microPower rail-to-rail input/output operational amplifier in SC-70-5 package. It delivers 350kHz gain-bandwidth, 20µA quiescent current, and operates from 2.4V to 5.5V supply - optimized for battery-powered smoke and CO detectors requiring ultra-low power and full rail utilization.
For engineers reviewing the OPA347SA/3KG4 datasheet, OPA347SA/3KG4 pinout, OPA347SA/3KG4 application, or OPA347SA/3KG4 equivalent, key selection criteria include guaranteed operation down to 2.4V, input voltage range extending 200mV beyond rails, output swing within 5mV of rails at light loads, and –55°C to +125°C temperature rating for harsh-environment sensing.
Technical Context
The OPA347SA/3KG4 uses a complementary differential input stage (N-channel + P-channel pairs) enabling rail-to-rail common-mode input from (V–) – 0.2V to (V+) + 0.2V. Its class AB output stage supports rail-to-rail swing into ≥100kΩ loads with <5mV headroom.
It is unity-gain stable and specified for capacitive load drive up to 250pF in buffer configuration. Input bias current is ±0.5pA typical, and PSRR/CMRR are maintained above 70dB across most of the input range except the 400mV transition region near (V+) – 1.3V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.4V to 5.5V - enables direct use with single Li-ion or two alkaline cells without regulation. |
| Quiescent Current | 20µA typ., 34µA max - ensures multi-year battery life in portable gas sensors. |
| Gain-Bandwidth Product | 350kHz - supports signal conditioning for DC–300Hz smoke/CO detector analog front-ends. |
| Input Common-Mode Range | (V–) – 0.2V to (V+) + 0.2V - allows direct interfacing to transducer outputs biased near supply rails. |
| Output Voltage Swing | Within 5mV of rails (RL ≥ 100kΩ) - maximizes dynamic range in low-voltage ADC driver applications. |
| Input Offset Voltage | 2mV max (–55°C to +125°C) - maintains accuracy in uncalibrated, wide-temperature industrial detectors. |
| Operating Temperature | –55°C to +125°C - qualified for under-hood, HVAC, and building safety systems. |
Pinout & Package
OPA347SA/3KG4 is packaged in SC-70-5 (DCK), a 1.25mm × 1.65mm surface-mount package with 0.65mm pitch. Pin 1 is marked by a dot or beveled edge.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | V– | Negative supply or ground reference - must be bypassed with 0.01µF ceramic capacitor. |
| 2 | V+ | Positive supply - supports single-supply operation from 2.4V; decoupling critical for noise immunity. |
| 3 | +In | Non-inverting input - high-impedance (10¹³ Ω || 6pF) node for sensor interface or reference buffering. |
| 4 | –In | Inverting input - matched to +In for precision differential gain; sensitive to PCB leakage at pA-level bias currents. |
| 5 | Out | Amplifier output - drives ADC inputs or transducer excitation circuits with rail-to-rail swing capability. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input and output | Enables full utilization of 2.4V–5.5V supply range - eliminates level-shifting circuitry in low-voltage sensor interfaces. |
| 20µA quiescent current | Reduces average system power to sub-100µW - extends battery life in wireless smoke alarms beyond 5 years. |
| 350kHz bandwidth at 20µA | Delivers best-in-class speed/power ratio - sufficient for filtering and amplifying electrochemical sensor outputs without compromising efficiency. |
| Specified from –55°C to +125°C | Guarantees parametric performance across automotive, industrial, and building safety operating environments. |
| SC-70-5 package (1.25mm × 1.65mm) | Minimizes PCB area in space-constrained detector modules - compatible with standard 0.65mm-pitch reflow processes. |
Applications
| Smoke Detectors | CO Detectors |
|---|---|
Use Scenario: Amplifying weak current signals from ionization or photoelectric chambers in battery-powered residential alarms. IC Role / Device Role / Timing Role: Precision transimpedance amplifier and buffer driving low-power 10–12-bit SAR ADCs. Use Value: 20µA IQ and rail-to-rail swing preserve signal fidelity while maximizing battery runtime and detection sensitivity at low VDD. | Use Scenario: Conditioning analog output of electrochemical CO sensors operating at 2.5V–5V with ambient temperature variation. IC Role / Device Role / Timing Role: Low-drift, low-noise signal conditioner with extended common-mode range for sensor biasing flexibility. Use Value: ±0.5pA input bias and 2mV offset drift ensure stable baseline over temperature - critical for false-alarm prevention. |
| 2-Wire Transmitters | Portable Medical Sensors |
Use Scenario: Signal conditioning stage in loop-powered 4–20mA transmitters where supply headroom is limited to <3V. IC Role / Device Role / Timing Role: Rail-to-rail I/V converter and output buffer operating from 2.4V minimum supply. Use Value: Guaranteed 2.4V operation and 5mV output swing enable full-scale 4–20mA compliance even at lowest loop voltage. | Use Scenario: Front-end amplifier for wearable pulse oximetry or glucose monitor analog channels powered by coin cells. IC Role / Device Role / Timing Role: Ultra-low-power sensor interface with high input impedance and minimal self-heating. Use Value: Sub-100nA input bias prevents loading of high-impedance biopotential electrodes - preserving signal integrity. |
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, identical SC-70-5 package and pinout. | Better suited for higher-frequency sensor signals (e.g., ultrasonic proximity) but not required for DC–300Hz gas detection. | Select OPA348SA/3K only if >350kHz bandwidth is needed; otherwise OPA347SA/3KG4 offers optimal cost/performance balance. |
| MCP6001UT-E/OT | 25µA IQ, 1MHz GBW, SC-70-5, but only specified from –40°C to +125°C and lacks extended rail-to-rail input (V– – 0.3V to V+ – 0.1V). | Acceptable for commercial-grade portable equipment but not qualified for extended industrial temperature range or true rail-to-rail input. | Choose MCP6001UT-E/OT for cost-sensitive consumer designs; avoid where –55°C operation or input beyond rails is required. |
Compared with OPA347SA/3KG4, OPA348SA/3K provides higher bandwidth at identical power and package, while MCP6001UT-E/OT trades temperature range and input range for lower unit cost - making OPA347SA/3KG4 the optimal choice for safety-critical, wide-temperature, ultra-low-power sensing.
Availability
OPA347SA/3KG4 is available at Aetrix Electronics and suitable for smoke detectors, CO detectors, and 2-wire transmitters requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for OPA347SA/3KG4 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 battery-operated safety and environmental monitoring systems demanding guaranteed performance from –55°C to +125°C.
FAQ
What is the minimum operating voltage for OPA347SA/3KG4?
The OPA347SA/3KG4 has a minimum operating voltage of 2.4V, as explicitly specified in the Electrical Characteristics table. This is distinct from the general OPA347 family minimum of 2.3V and reflects characterization and guarantee for the SC-70-5 (DCK) package variant. Operation below 2.4V is not assured and may result in degraded parameters including open-loop gain and output swing.
Does OPA347SA/3KG4 support rail-to-rail input beyond the supply rails?
Yes, the OPA347SA/3KG4 supports rail-to-rail input with a common-mode voltage range from (V–) – 0.2V to (V+) + 0.2V. This 400mV total extension beyond the rails enables direct connection to sensors or references biased outside the supply domain, provided input current is limited to ≤10mA using series resistors per the Absolute Maximum Ratings.
What is the guaranteed output voltage swing for OPA347SA/3KG4 at 5kΩ load?
At a 5kΩ load, the OPA347SA/3KG4 guarantees an output voltage swing of 90mV to 125mV from each rail (i.e., V– + 90mV to V+ – 90mV) while maintaining open-loop gain > 88dB. This is documented in the Electrical Characteristics table under "Voltage Output Swing from Rail" with condition RL = 5kΩ and AOL > 88dB.
Is OPA347SA/3KG4 pin-compatible with other OPA347 variants in SC-70-5?
Yes, all OPA347 variants in SC-70-5 package (including OPA347SA/250, OPA347SA/3K, and OPA347SA/3KG4) share identical pinout, marking (S47), and mechanical footprint. The suffix "G4" denotes green (RoHS-compliant, no Sb/Br) packaging, with no electrical or pinout differences from non-G4 versions.
What thermal resistance does the SC-70-5 package of OPA347SA/3KG4 have?
The SC-70-5 package used for OPA347SA/3KG4 has a junction-to-ambient thermal resistance (θJA) of 250°C/W, as specified in the Thermal Resistance table. This value assumes standard JEDEC 2-layer board conditions and informs thermal design for continuous operation at maximum ambient temperature.
OPA347SA/3KG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 5-TSSOP, SC-70-5, SOT-353
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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/3KG4 FAQ
1.How can I place an order for OPA347SA/3KG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA347SA/3KG4 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/3KG4 reliable?
The price and inventory of OPA347SA/3KG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA347SA/3KG4 is usually 5 days.
3.What payment methods are accepted for OPA347SA/3KG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA347SA/3KG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA347SA/3KG4?
OPA347SA/3KG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA347SA/3KG4 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/3KG4?
For technical support, including OPA347SA/3KG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA347SA/3KG4 requirements.
6.How does Aetrix verify that OPA347SA/3KG4 is sourced from the original manufacturer or authorized distributors?
All OPA347SA/3KG4 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/3KG4 meets industry standards.
7.What is the process for return or replacement of OPA347SA/3KG4?
All OPA347SA/3KG4 units undergo pre-shipment inspection (PSI). If there is an issue with OPA347SA/3KG4, 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/3KG4 part is unused and in its original packaging.
Return procedure for OPA347SA/3KG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
OPA347SA/3KG4 Tags
-
LM358DT
STMicroelectronics
-
LM358DR
Texas Instruments
-
LM2904DR
Texas Instruments
-
LM358ADR
Texas Instruments
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LM2904DGKR
Texas Instruments
-
LM324DR
Texas Instruments
-
MCP6006T-E/OT
Microchip Technology
-
MCP6006UT-E/OT
Microchip Technology
-
LM324PWR
Texas Instruments
-
LM2902PWR
Texas Instruments
-
LM2902DR
Texas Instruments
-
LM358P
Texas Instruments
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