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Texas Instruments OPA347UA/2K5G4
- Part No.:
- OPA347UA/2K5G4
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA347UA/2K5G4.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,798
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Product details
Overview
OPA347UA/2K5G4 from Texas Instruments is a single-channel, rail-to-rail input/output microPower operational amplifier in SOIC-8 package. It delivers 350kHz gain-bandwidth, 20µA quiescent current per channel, and operates from 2.3V to 5.5V single supply - enabling precision signal conditioning in space-constrained, battery-powered smoke detectors and 2-wire transmitters.
For engineers reviewing the OPA347UA/2K5G4 datasheet, OPA347UA/2K5G4 pinout, OPA347UA/2K5G4 application, or OPA347UA/2K5G4 equivalent, key selection criteria include rail-to-rail I/O swing (within 5mV of rails at light load), ultra-low IQ for multi-year battery life, input common-mode range extending 200mV beyond rails, and guaranteed operation from –55°C to +125°C.
Technical Context
The OPA347UA/2K5G4 uses a complementary differential input stage (N- and P-channel pairs) to achieve rail-to-rail input operation, with a 400mV transition region where both pairs conduct - causing measurable degradation in PSRR, CMRR, and offset drift within that zone. Its class AB output stage enables rail-to-rail output swing down to 5mV from supply rails under 100kΩ load.
It is unity-gain stable and optimized for driving medium-speed ADCs like the ADS7822, supporting anti-aliasing RC networks while maintaining low 0.17V/µs slew rate and 21µs 0.1% settling time. Input bias current is ±0.5pA typical, with 10¹³Ω || 3pF differential impedance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.3V to 5.5V single supply - supports direct integration into 3.3V and 5V systems without level-shifting. |
| Quiescent Current | 20µA typical per amplifier - enables >10-year battery life in CO/smoke detectors using coin cells. |
| Gain-Bandwidth Product | 350kHz - sufficient for sensor amplification, 2-wire transmitter loop filtering, and ADC buffering up to ~10ksps. |
| Input Common-Mode Range | (V–) – 0.2V to (V+) + 0.2V - allows sensing signals below ground or above V+ in single-supply configurations. |
| Output Voltage Swing | Within 5mV of rails (RL = 100kΩ) - maximizes dynamic range in low-voltage systems (e.g., 2.5V supply yields >2.49Vpp output). |
| Input Offset Voltage | 2mV max at +25°C - ensures <0.1% error in 2mV-level gas sensor outputs without trimming. |
| Operating Temperature | –55°C to +125°C - qualified for automotive cabin, industrial field transmitter, and outdoor safety equipment environments. |
Pinout & Package
OPA347UA/2K5G4 is packaged in SOIC-8 (Package Drawing D), with standard dual-opamp pinout adapted for single-amplifier use: pins 1–4 and 5–8 form two independent sections, but only one amplifier is implemented. Pin 1 is NC, pin 2 is –In, pin 3 is +In, pin 4 is V–, pin 5 is V+, pin 6 is Out, pins 7–8 are NC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | No Connect | Unused terminal; must be left floating or tied to ground per layout best practice - no internal connection. |
| 2 | Inverting Input | Differential input node with ±0.5pA bias current; accepts signals from (V–) – 0.2V to (V+) + 0.2V. |
| 3 | Noninverting Input | Differential input node matched to Pin 2; used for unity-gain buffers and noninverting amplifiers. |
| 4 | Negative Supply | Ground reference for single-supply operation; must be bypassed with 0.01µF ceramic capacitor. |
| 5 | Positive Supply | 2.3V–5.5V input; supplies internal bias and output stage - requires local 0.01µF ceramic decoupling. |
| 6 | Output | Rail-to-rail voltage source capable of sourcing/sinking ±17mA; drives 5kΩ loads to within 125mV of rails. |
| 7 | No Connect | Unused terminal; electrically isolated - no routing or thermal pad connection required. |
| 8 | No Connect | Unused terminal; identical isolation as Pin 7 - avoid PCB copper fill beneath this pad. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input | Extends 200mV beyond supply rails - enables direct interfacing with sensors whose output exceeds V+ or falls below V–. |
| Rail-to-rail output | Swings to within 5mV of V+ and V– under 100kΩ load - preserves full ADC input range in 2.5V–3.3V systems. |
| MicroPower operation | 20µA IQ at +25°C - reduces average system current by >90% vs. standard op amps, critical for 10+ year battery life. |
| Unity-gain stability | Stable with gain ≥ 1 and CL ≤ 250pF - eliminates need for external compensation in buffer and filter applications. |
| Wide temperature range | Specified from –55°C to +125°C - supports deployment in unheated industrial enclosures and automotive under-hood locations. |
Applications
| Smoke Detector Signal Conditioning | 2-Wire Current Loop Transmitter |
|---|---|
|
Use Scenario: Amplifying weak ionization chamber current (pA–nA) into clean voltage for ADC sampling in residential smoke alarms. IC Role / Device Role / Timing Role: Precision transimpedance amplifier with rail-to-rail input to capture sub-millivolt signals near ground, and rail-to-rail output to maximize ADC utilization. Use Value: 20µA IQ extends lithium thionyl chloride battery life beyond 10 years; 2mV VOS avoids calibration in mass-produced units. |
Use Scenario: Converting 4–20mA loop voltage drop into conditioned signal for microcontroller ADC in industrial process sensors. IC Role / Device Role / Timing Role: Low-drift, low-noise buffer isolating loop-powered sensor front-end from noisy digital circuitry. Use Value: 350kHz GBW supports fast loop response; rail-to-rail I/O accommodates 0–5V ADC inputs without external level shifters. |
| Portable Gas Sensor Interface | Battery-Powered Environmental Monitor |
|
Use Scenario: Amplifying electrochemical CO sensor output (±10mV full scale) in handheld air quality meters. IC Role / Device Role / Timing Role: Single-supply instrumentation amplifier stage with high CMRR (>70dB) rejecting power rail noise in compact PCB layouts. Use Value: 0.5pA input bias prevents loading of high-impedance sensor electrodes; –55°C to +125°C rating covers outdoor storage and operation. |
Use Scenario: Buffering thermistor and humidity sensor outputs in solar-charged environmental loggers deployed in remote locations. IC Role / Device Role / Timing Role: Ultra-low-power signal conditioner enabling continuous sampling at <10µA average system current. Use Value: SOIC-8 package allows automated assembly; 2.3V min supply permits operation down to depleted Li-ion cell voltage (~2.4V). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA347SA/3KG4 | SC70-5 package (2.0 × 1.25mm), 2.4V minimum supply, same electrical specs. | Used where board space is constrained (e.g., wearable gas sensors); lacks NC pins, reducing layout complexity. | Select when footprint reduction outweighs SOIC-8's handling and thermal advantages. |
| MCP6001T-E/OT | 2.7V–5.5V supply, 1µA IQ, 1MHz GBW, SC70-5 - lower power but higher bandwidth and narrower supply range. | Better for ultra-low-power always-on wake-up circuits; unsuitable for 2.3V–2.7V battery chemistries or 350kHz+ signal paths. | Choose only if supply is ≥2.7V and bandwidth >350kHz is required - not a drop-in replacement. |
Compared with OPA347UA/2K5G4, the OPA347SA/3KG4 offers identical performance in a 60% smaller footprint but sacrifices thermal dissipation margin and manual reworkability; the MCP6001T-E/OT trades 20× lower IQ for 3× higher GBW and incompatible 2.7V+ supply - making it viable only in narrow voltage, high-efficiency edge cases.
Availability
OPA347UA/2K5G4 is available at Aetrix Electronics and suitable for smoke detector manufacturing, 2-wire industrial transmitter design, and portable environmental sensor development requiring stable component supply across extended product lifecycles.
Supply support for OPA347UA/2K5G4 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 over 50 years of op amp innovation and broad industrial qualification expertise.
The OPA347 series belongs to TI's precision microPower op amp portfolio, designed specifically for battery-critical, space-constrained applications including safety sensors, portable instrumentation, and loop-powered transmitters.
FAQ
What is the maximum capacitive load the OPA347UA/2K5G4 can drive in unity-gain configuration?
The OPA347UA/2K5G4 can directly drive up to 250pF of pure capacitive load in unity-gain configuration while maintaining stability. For larger loads, a 10Ω–20Ω series resistor between the output and load improves phase margin without degrading DC accuracy - verified in TI's SBOS167D datasheet Figure 6 and Typical Characteristics section.
Does the OPA347UA/2K5G4 support true rail-to-rail input beyond the supply rails?
Yes - the OPA347UA/2K5G4 input common-mode range extends from (V–) – 0.2V to (V+) + 0.2V, allowing valid operation 200mV beyond both rails. Inputs up to 500mV beyond rails are safe if current-limited to ≤10mA, as confirmed in Absolute Maximum Ratings and Applications Information sections of the datasheet.
What is the function of Pins 1, 7, and 8 on the OPA347UA/2K5G4 SOIC-8 package?
Pins 1, 7, and 8 on the OPA347UA/2K5G4 are No Connect (NC) terminals with no internal bond wire or silicon connection. They must remain unconnected on the PCB - neither tied to ground nor routed - to prevent parasitic coupling or thermal stress effects documented in TI's package drawings and layout guidelines.
Can the OPA347UA/2K5G4 operate from a 2.3V supply while meeting all specifications?
Yes - the OPA347UA/2K5G4 is fully specified and tested from 2.3V to 5.5V single supply. Electrical Characteristics tables explicitly list 2.3V as the minimum operating voltage, and all parameters (including GBW, VOS, and output swing) are guaranteed across this range at temperatures from –55°C to +125°C.
How does the OPA347UA/2K5G4 handle input signals crossing the rail-to-rail transition region?
The OPA347UA/2K5G4 uses complementary N- and P-channel input stages with a 400mV transition region near (V+) – 1.3V where both pairs conduct. Within this zone, PSRR, CMRR, and offset drift degrade - so designs should bias noninverting inputs away from this region or use inverting configurations with fixed common-mode voltage to avoid discontinuities.
OPA347UA/2K5G4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- 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):
- 2.3 V
- Voltage - Supply Span (Max):
- 5.5 V
- Operating Temperature:
- -55°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
OPA347UA/2K5G4 FAQ
1.How can I place an order for OPA347UA/2K5G4 through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA347UA/2K5G4 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 OPA347UA/2K5G4 reliable?
The price and inventory of OPA347UA/2K5G4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA347UA/2K5G4 is usually 5 days.
3.What payment methods are accepted for OPA347UA/2K5G4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA347UA/2K5G4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA347UA/2K5G4?
OPA347UA/2K5G4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA347UA/2K5G4 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 OPA347UA/2K5G4?
For technical support, including OPA347UA/2K5G4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA347UA/2K5G4 requirements.
6.How does Aetrix verify that OPA347UA/2K5G4 is sourced from the original manufacturer or authorized distributors?
All OPA347UA/2K5G4 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 OPA347UA/2K5G4 meets industry standards.
7.What is the process for return or replacement of OPA347UA/2K5G4?
All OPA347UA/2K5G4 units undergo pre-shipment inspection (PSI). If there is an issue with OPA347UA/2K5G4, 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 OPA347UA/2K5G4 part is unused and in its original packaging.
Return procedure for OPA347UA/2K5G4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
OPA347UA/2K5G4 Tags
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LM358DT
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LM358DR
Texas Instruments
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LM2904DR
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MCP6006T-E/OT
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MCP6006UT-E/OT
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LM358P
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