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Texas Instruments OPA347UA
- Part No.:
- OPA347UA
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA347UA.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:500
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Product details
Overview
OPA347UA from Texas Instruments is a single-channel, microPower, rail-to-rail input/output 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 battery-powered smoke detectors and 2-wire transmitters.
For engineers reviewing the OPA347UA datasheet, OPA347UA pinout, OPA347UA application, or OPA347UA equivalent, key selection criteria include its rail-to-rail I/O swing (within 5mV of rails at light load), ultra-low IQ for multi-year battery life, −55°C to +125°C temperature rating, and verified stability driving ADC input capacitance without external compensation.
Technical Context
The OPA347UA employs a complementary differential input stage enabling rail-to-rail common-mode input range extending 200mV beyond both supply rails. Its class AB output stage supports rail-to-rail output swing down to 5mV from V+ or V− under 100kΩ load while maintaining >100dB open-loop gain.
It is unity-gain stable and optimized for low-noise, low-distortion operation in single-supply configurations. Input bias current is ±0.5pA typical, with input voltage noise density of 60nV/√Hz at 1kHz and 12µVPP integrated over 0.1Hz–10Hz - critical for high-impedance sensor interfaces.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.3V to 5.5V single supply - enables direct integration into 3V and 5V battery or energy-harvesting systems without LDO overhead. |
| Quiescent Current | 20µA typical per channel - supports >10-year operation on coin-cell batteries in portable safety sensors. |
| Gain-Bandwidth Product | 350kHz - sufficient for buffering 12-bit SAR ADCs (e.g., ADS7822) with <27µs 0.01% settling time. |
| Input Common-Mode Range | (V−) − 0.2V to (V+) + 0.2V - allows direct sensing of signals near ground or supply rails without level-shifting. |
| Output Voltage Swing | Within 5mV of rails (RL = 100kΩ) - maximizes dynamic range in low-voltage systems like CO detectors. |
| Input Offset Voltage | 2mV max at 25°C - ensures sub-1% error in 2-wire transmitter current-loop output stages. |
| Operating Temperature | −55°C to +125°C - qualified for automotive cabin and industrial process monitoring environments. |
Pinout & Package
OPA347UA is packaged in an 8-pin SOIC (SO-8) surface-mount package with standard JEDEC MS-012AC footprint and 1.27mm pitch. Thermal resistance θJA is 150°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Out A | Amplifier output - drives ADC input or transducer load; rail-to-rail swing supports full-scale analog interface. |
| 2 | −In A | Inverting input - accepts feedback network; high impedance (1013Ω) minimizes loading on sensor sources. |
| 3 | +In A | Non-inverting input - connects to reference or sensor; common-mode range extends beyond rails for flexible biasing. |
| 4 | V− | Negative supply - tied to ground in single-supply use; must be bypassed with 0.01µF ceramic capacitor. |
| 5 | NC | No connect - internal die pad; left unconnected per TI design guidelines. |
| 6 | NC | No connect - internal die pad; left unconnected per TI design guidelines. |
| 7 | +In B | Not applicable - OPA347UA is single-channel; pins 5–8 are unused in this variant. |
| 8 | V+ | Positive supply - accepts 2.3V–5.5V; low IQ enables operation directly from Li-ion or alkaline cells. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input and output | Enables full utilization of supply voltage headroom in 3V systems - e.g., preserves 4.995VPP output swing from 5V supply. |
| 20µA quiescent current | Reduces average power to <100µW at 5V - extends battery life in portable smoke detectors beyond 5 years. |
| 350kHz bandwidth with 0.17V/µs slew rate | Supports accurate buffering of 12-bit ADC sampling waveforms up to ~35kHz without distortion. |
| Unity-gain stable, no external compensation | Eliminates need for feedback capacitor in non-inverting buffer designs - simplifies layout for space-constrained PCBs. |
| Specified from −55°C to +125°C | Validates performance across automotive under-hood and industrial ambient conditions without derating. |
Applications
| Smoke Detectors | 2-Wire Transmitters |
|---|---|
Use Scenario: Ionization or photoelectric smoke sensor signal amplification feeding a low-power MCU ADC. IC Role / Device Role / Timing Role: Precision DC-coupled buffer and gain stage converting picoamp-level ion current to 0–5V range. Use Value: Rail-to-rail I/O and 20µA IQ enable direct 3V battery operation with >10-year shelf life and full-scale dynamic range. | Use Scenario: 4–20mA loop transmitter front-end conditioning thermocouple or RTD signals. IC Role / Device Role / Timing Role: Low-drift, low-noise instrumentation amplifier input stage with programmable gain. Use Value: 2mV max offset and 60nV/√Hz noise ensure <0.1% total error in 16-bit loop calibration over temperature. |
| Battery-Powered Gas Sensors | Portable Medical Monitors |
Use Scenario: Electrochemical CO or NO₂ sensor output amplification in handheld air quality meters. IC Role / Device Role / Timing Role: Ultra-low-power transimpedance amplifier converting nanoamp sensor current to voltage. Use Value: Sub-picoamp input bias and rail-to-rail input allow direct connection to high-impedance electrochemical cells without guard traces. | Use Scenario: ECG/EEG front-end signal conditioning in wearable patient monitors. IC Role / Device Role / Timing Role: High-input-impedance, low-noise buffer isolating electrode signals before filtering and digitization. Use Value: 12µVPP 0.1Hz–10Hz noise and 10¹³Ω input impedance preserve microvolt-level biopotential integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA344UA | Higher IQ (65µA), same SOIC-8 package, 1MHz GBW, but only rail-to-rail output (not input). | Less suitable for ultra-low-power smoke detectors; better for higher-speed sensor interfaces where input rail-to-rail not required. | Select OPA344UA only when bandwidth >350kHz is needed and battery life is secondary to speed. |
| MCP6001T-I/OT | Lower IQ (9µA), SOT23-5 package, 1MHz GBW, rail-to-rail I/O, but only specified to +125°C (not −55°C). | Not qualified for extended temperature industrial or automotive use; limited to commercial-grade portable equipment. | Choose MCP6001T-I/OT for cost-sensitive consumer devices operating 0°C–70°C with minimal board space. |
Compared with OPA347UA, OPA344UA trades ultra-low power for higher speed and lacks rail-to-rail input, while MCP6001T-I/OT reduces IQ further but sacrifices −55°C qualification and SOIC-8 compatibility - making OPA347UA the only option meeting full industrial temp, rail-to-rail I/O, and <25µA IQ in SOIC-8.
Availability
OPA347UA is available at Aetrix Electronics and suitable for smoke detectors, 2-wire transmitters, and portable medical monitors requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for OPA347UA 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 battery-operated safety and industrial sensing applications - emphasizing longevity, accuracy, and robustness over wide temperature extremes.
FAQ
What is the maximum operating supply voltage for the OPA347UA?
The absolute maximum supply voltage for OPA347UA is 7.5V between V+ and V− pins. However, the recommended operating range is 2.3V to 5.5V. Exceeding 5.5V may degrade long-term reliability and is not characterized per the datasheet. For 5V systems, OPA347UA provides optimal performance with 20µA IQ and full rail-to-rail operation - confirmed in SBOS167D Rev D.
Does the OPA347UA support true rail-to-rail input operation?
Yes, the OPA347UA features true rail-to-rail input operation with a common-mode voltage range from (V−) − 0.2V to (V+) + 0.2V. This is achieved via a complementary N-channel/P-channel input stage. Operation within the 400mV transition region near (V+) − 1.3V may slightly degrade PSRR and CMRR, but full specification compliance is maintained outside that zone per SBOS167D Section 7.
Can the OPA347UA drive capacitive loads without oscillation?
Yes, the OPA347UA is unity-gain stable and can directly drive up to 250pF purely capacitive loads. For larger loads or inverting configurations, adding a 10Ω–20Ω series resistor at the output or a 4pF–6pF feedback capacitor restores stability without compromising DC accuracy - as validated in Figure 6 and Figure 7 of SBOS167D.
What is the input bias current specification for OPA347UA at 25°C?
The input bias current for OPA347UA is ±0.5pA typical and ±10pA maximum at 25°C, per Electrical Characteristics table in SBOS167D. This ultra-low value enables high-impedance sensor interfacing (e.g., pH electrodes or photodiodes) without significant offset error - critical for precision gas detection circuits using OPA347UA.
Is the OPA347UA pin-compatible with other members of the OPA347 family?
No - OPA347UA (SOIC-8) is not pin-compatible with OPA347NA (SOT23-5) or OPA347SA (SC70-5), as each uses different pinouts and channel counts. The SOIC-8 package contains two unused pins (5 and 6) and repurposes pins 7–8 for dual-channel variants; OPA347UA uses only pins 1–4 and 8, with pins 5–7 NC. Always verify pin mapping against SBOS167D Figure 1 and Package Drawing D.
OPA347UA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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):
- 2.3 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 FAQ
1.How can I place an order for OPA347UA through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA347UA 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 reliable?
The price and inventory of OPA347UA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA347UA is usually 5 days.
3.What payment methods are accepted for OPA347UA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA347UA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA347UA?
OPA347UA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA347UA 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?
For technical support, including OPA347UA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA347UA requirements.
6.How does Aetrix verify that OPA347UA is sourced from the original manufacturer or authorized distributors?
All OPA347UA 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 meets industry standards.
7.What is the process for return or replacement of OPA347UA?
All OPA347UA units undergo pre-shipment inspection (PSI). If there is an issue with OPA347UA, 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 part is unused and in its original packaging.
Return procedure for OPA347UA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
OPA347UA Tags
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LM358DT
STMicroelectronics
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LM358DR
Texas Instruments
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LM2904DGKR
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MCP6006T-E/OT
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MCP6006UT-E/OT
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LM324PWR
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LM2902DR
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LM358P
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