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Texas Instruments OPA2347EA/250
- Part No.:
- OPA2347EA/250
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SOT-23-8
- Datasheet:
-
OPA2347EA/250.pdf
- Description:
- IC OPAMP GP 2 CIRCUIT SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:1,495
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Product details
Overview
OPA2347EA/250 from Texas Instruments is a dual, rail-to-rail input/output microPower operational amplifier in an 8-pin SOT-23 package. It delivers 350kHz gain-bandwidth, 20µA per amplifier quiescent current, ±10pA input bias current, and operates from 2.3V to 5.5V single supply - enabling ultra-low-power sensor signal conditioning in space-constrained portable systems.
For engineers reviewing the OPA2347EA/250 datasheet, OPA2347EA/250 pinout, OPA2347EA/250 application, or OPA2347EA/250 equivalent, key selection criteria include rail-to-rail I/O swing within 5mV of rails at light loads, 2.3V minimum operating voltage, –55°C to +125°C temperature rating, and verified performance in battery-powered smoke/CO detector front-ends.
Technical Context
The OPA2347EA/250 uses a complementary differential input stage (N-channel + P-channel pairs) enabling rail-to-rail common-mode input range extending 200mV beyond V– and V+, with a 400mV transition region where both stages operate. Its class AB output stage supports rail-to-rail output swing down to 5mV from rails into 100kΩ loads.
It is unity-gain stable and optimized for driving capacitive loads up to 250pF directly; stability under capacitive loading is enhanced by internal compensation and validated across –55°C to +125°C. Input voltage noise is 60nV/√Hz at 1kHz, and input bias current remains below ±10pA over temperature.
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-powered systems without level-shifting. |
| Quiescent Current | 20µA per amplifier (typical) - allows continuous operation for years on coin-cell batteries in always-on sensing nodes. |
| Gain-Bandwidth Product | 350kHz - sufficient for DC-coupled sensor amplification and anti-aliasing filtering before medium-speed ADCs (e.g., ADS7822). |
| Input Offset Voltage | 2mV (min), 6mV (max) - supports accurate low-level signal amplification in precision analog front-ends. |
| Input Bias Current | ±0.5pA (typical), ±10pA (max) - minimizes voltage error across high-impedance sources like electret microphones or gas sensor bridges. |
| Output Swing | Within 5mV of rails (RL ≥ 100kΩ) - maximizes dynamic range in low-voltage systems, preserving >99% of available signal headroom. |
| Operating Temperature | –55°C to +125°C - qualified for automotive cabin modules, industrial smoke detectors, and outdoor environmental sensors. |
Pinout & Package
SOT-23-8 (DCN) package: 2.9mm × 2.8mm surface-mount, lead-free NiPdAu finish, MSL Level-1 (260°C, unlimited reflow), thermal resistance θJA = 150°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | V– (Ground / Negative Supply) | Common reference for both amplifiers; must be bypassed with 0.01µF ceramic capacitor near pin. |
| 2 | +In A (Noninverting Input, Amplifier A) | High-impedance input accepting signals from V– – 0.2V to V+ + 0.2V; compatible with electret mic bias networks. |
| 3 | –In A (Inverting Input, Amplifier A) | Used for feedback configuration; input common-mode range matches +In A; sensitive to PCB parasitic capacitance. |
| 4 | Out A (Output, Amplifier A) | Rail-to-rail capable output; drives ADC inputs or RC anti-aliasing filters directly; limited to ±17mA short-circuit current. |
| 5 | Out B (Output, Amplifier B) | Independent output identical in capability to Out A; enables dual-path signal conditioning (e.g., bandpass + gain stages). |
| 6 | –In B (Inverting Input, Amplifier B) | Matches –In A electrical behavior; used for second channel feedback; shares same input impedance and noise profile. |
| 7 | +In B (Noninverting Input, Amplifier B) | Matches +In A; supports independent sensor interface (e.g., CO sensor bridge + reference buffer). |
| 8 | V+ (Positive Supply) | Single-supply input; accepts 2.3V–5.5V; requires local 0.01µF ceramic decoupling to ground. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input and output | Enables full-scale signal utilization in 2.3V–5.5V systems - e.g., 0–2.3V output from 0–2.3V sensor input without clipping. |
| 20µA per amplifier quiescent current | Supports multi-year battery life in wireless smoke detectors using CR2032 cells (220mAh) with 10-second wake-up intervals. |
| 350kHz bandwidth with unity-gain stability | Allows clean amplification of speech-band (300Hz–3kHz) signals while rejecting RF interference via inherent roll-off. |
| ±10pA max input bias current | Prevents significant offset error when interfacing with high-Z sources like 1MΩ electret microphone bias resistors. |
| –55°C to +125°C operating range | Validated for under-hood automotive sensors and industrial fire alarm control panels exposed to wide ambient extremes. |
Applications
| Portable Medical Sensors | Battery-Powered Gas Detectors |
|---|---|
Use Scenario: Signal conditioning for wearable pulse oximeter photodiode current outputs. IC Role / Device Role / Timing Role: Dual-channel transimpedance amplifier and DC offset removal stage before 12-bit ADC sampling. Use Value: Rail-to-rail I/O preserves >99% dynamic range at 3V supply; 20µA IQ extends coin-cell lifetime beyond 18 months. | Use Scenario: Front-end amplification for electrochemical CO sensor bridge outputs. IC Role / Device Role / Timing Role: Low-drift, low-noise instrumentation amplifier stage with programmable gain for ppm-level detection. Use Value: 2mV max input offset ensures <1% error at 200mV full-scale sensor output; 60nV/√Hz noise floor resolves sub-ppm variations. |
| 2-Wire Loop-Powered Transmitters | Smoke Detector Analog Front-Ends |
Use Scenario: Conditioning thermocouple or RTD signals in 4–20mA loop-powered field instruments. IC Role / Device Role / Timing Role: Precision buffer and cold-junction compensation amplifier operating from loop-derived 3.3V. Use Value: 2.3V minimum supply allows operation during brown-out conditions; rail-to-rail output drives DAC reference rails directly. | Use Scenario: Amplifying ionization chamber current pulses in residential smoke alarms. IC Role / Device Role / Timing Role: High-input-impedance current-to-voltage converter followed by comparator interface. Use Value: ±0.5pA typical input bias prevents false triggering from leakage; 125°C rating supports enclosed plastic housing environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual rail-to-rail op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP6022-I/SN | Higher IQ (100µA), wider GBW (1MHz), but only rated to +85°C; no –55°C spec. | Not suitable for automotive or industrial extended-temperature deployments; better for cost-sensitive consumer devices. | Select MCP6022-I/SN only if ambient temperature stays ≤85°C and higher speed justifies 5× higher power draw. |
| LMV358IDR | Lower IQ (80µA), narrower GBW (1MHz), rail-to-rail output only (not input); CMRR degrades below 1V from rails. | Limited common-mode range restricts use with low-voltage sensor bridges; unsuitable for smoke detector ion chamber biasing. | Choose LMV358IDR only for non-critical, room-temperature applications where input rail-to-rail is not required. |
Compared with MCP6022-I/SN and LMV358IDR, the OPA2347EA/250 uniquely combines –55°C to +125°C operation, true rail-to-rail I/O, and 20µA IQ - making it the only viable option for battery-powered safety-critical sensors requiring long-term reliability across extreme temperatures.
Availability
OPA2347EA/250 is available at Aetrix Electronics and suitable for portable medical sensors, battery-powered gas detectors, and smoke detector analog front-ends requiring stable component supply with guaranteed long-term availability.
Supply support for OPA2347EA/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 OPA2347EA/250 belongs to TI's OPA347 family - designed specifically for ultra-low-power, rail-to-rail signal conditioning in battery-operated safety and environmental monitoring systems.
FAQ
What is the minimum supply voltage for reliable operation of the OPA2347EA/250?
The OPA2347EA/250 is fully specified and ensured to operate reliably from 2.3V to 5.5V single supply. At 2.3V, it maintains rail-to-rail input/output swing, 350kHz bandwidth, and 20µA quiescent current - enabling direct use with partially discharged lithium coin cells or 2-cell alkaline batteries. The datasheet confirms functionality down to 2.3V across the full –55°C to +125°C temperature range.
Does the OPA2347EA/250 support rail-to-rail input, and what is the practical impact?
Yes, the OPA2347EA/250 supports rail-to-rail input with common-mode range from (V–) – 0.2V to (V+) + 0.2V. This allows direct interfacing with sensors whose output spans the full supply range - such as electret microphones biased at V+/2 or CO sensor bridges referenced to ground. The dual-input-stage architecture ensures continuity across the full range, though PSRR and CMRR degrade slightly in the 400mV transition region near V+ – 1.3V.
Can the OPA2347EA/250 drive capacitive loads, and what is the maximum supported value?
The OPA2347EA/250 can directly drive up to 250pF of pure capacitive load in unity-gain configuration while maintaining stability. For larger loads or inverting configurations, external compensation (e.g., 4–6pF feedback capacitor or 10–20Ω series resistor) is recommended. This capability is critical for driving ADC input capacitance (e.g., ADS7822's 20pF) without external buffers, reducing component count in compact smoke detector PCBs.
What is the input bias current specification for the OPA2347EA/250, and why does it matter in sensor applications?
The OPA2347EA/250 has a typical input bias current of ±0.5pA and a maximum of ±10pA over temperature. This ultra-low value prevents significant voltage errors when amplifying signals from high-impedance sources - such as 1MΩ electret microphone bias networks or electrochemical gas sensor bridges. In a 1MΩ source, ±10pA introduces only ±10µV offset, preserving measurement accuracy in ppm-level CO detection.
Is the OPA2347EA/250 qualified for automotive or industrial temperature ranges?
Yes, the OPA2347EA/250 is fully specified and tested over –55°C to +125°C, meeting requirements for under-dash automotive modules, industrial fire alarm control units, and outdoor environmental sensors. Its parametric performance - including input offset drift (3µV/°C), CMRR (70dB min), and quiescent current (38µA max at 125°C) - is guaranteed across this full range, unlike commercial-grade alternatives limited to 0°C–70°C or –40°C–85°C.
OPA2347EA/250 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- microPOWER™
- Package/Case:
- SOT-23-8
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 2
- 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 (x2 Channels)
- 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:
- SOT-23-8
OPA2347EA/250 FAQ
1.How can I place an order for OPA2347EA/250 through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA2347EA/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 OPA2347EA/250 reliable?
The price and inventory of OPA2347EA/250 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA2347EA/250 is usually 5 days.
3.What payment methods are accepted for OPA2347EA/250?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA2347EA/250 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA2347EA/250?
OPA2347EA/250 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA2347EA/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 OPA2347EA/250?
For technical support, including OPA2347EA/250 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA2347EA/250 requirements.
6.How does Aetrix verify that OPA2347EA/250 is sourced from the original manufacturer or authorized distributors?
All OPA2347EA/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 OPA2347EA/250 meets industry standards.
7.What is the process for return or replacement of OPA2347EA/250?
All OPA2347EA/250 units undergo pre-shipment inspection (PSI). If there is an issue with OPA2347EA/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 OPA2347EA/250 part is unused and in its original packaging.
Return procedure for OPA2347EA/250:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
OPA2347EA/250 Tags
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LM358DT
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MCP6006UT-E/OT
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