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Texas Instruments OPA2347EA/3KG4
- Part No.:
- OPA2347EA/3KG4
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SOT-23-8
- Datasheet:
-
OPA2347EA/3KG4.pdf
- Description:
- IC OPAMP GP 2 CIRCUIT SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:4,917
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Product details
Overview
OPA2347EA/3KG4 from Texas Instruments is a dual, microPower, rail-to-rail input/output operational amplifier in SOT-23-8 package, specified for –55°C to +125°C operation. It delivers 350kHz gain-bandwidth, 20µA per amplifier quiescent current, and output swing within 15mV of rails (RL = 100kΩ), enabling precision signal conditioning in ultra-low-power battery-powered smoke detectors and 2-wire transmitters.
For engineers reviewing the OPA2347EA/3KG4 datasheet, OPA2347EA/3KG4 pinout, OPA2347EA/3KG4 application, or OPA2347EA/3KG4 equivalent, key selection criteria include its 2.3V to 5.5V single-supply range, ±0.5pA typical input bias current, rail-to-rail input extending 200mV beyond rails, and guaranteed performance across automotive-grade temperature extremes.
Technical Context
The OPA2347EA/3KG4 employs complementary differential input pairs (N-channel and P-channel) to achieve rail-to-rail input operation, with a 400mV transition region where both stages conduct-causing potential degradation in PSRR, CMRR, and offset drift. Its class AB output stage supports rail-to-rail output swing down to 5mV from rails under light loads.
It is unity-gain stable and optimized for driving medium-speed ADCs like the ADS7822, with low 60nV/√Hz input voltage noise density at 1kHz and 12µVPP 0.1Hz–10Hz integrated noise. Input common-mode range spans (V–) – 0.2V to (V+) + 0.2V, and absolute maximum input voltage is (V–) – 0.5V to (V+) + 0.5V.
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 (per amp) | 20µA typ, 34µA max - allows continuous operation for years on coin-cell batteries in portable safety sensors. |
| Gain-Bandwidth Product | 350kHz - supports bandwidth-critical functions such as 3kHz speech bandpass filtering in electret microphone interfaces. |
| Input Offset Voltage | 2mV min, 6mV max at +25°C - ensures <0.1% error in 2-wire transmitter current-loop output scaling. |
| Output Voltage Swing | Within 15mV of rails (RL = 100kΩ) - maximizes dynamic range in low-voltage CO detector analog front-ends. |
| Input Bias Current | ±0.5pA typ - preserves high-impedance sensor node integrity in smoke detector ionization chamber circuits. |
| Operating Temperature | –55°C to +125°C - meets extended industrial and automotive under-hood environmental requirements. |
Pinout & Package
OPA2347EA/3KG4 is packaged in an 8-pin SOT-23 surface-mount package (package drawing DCN), with exposed pad not electrically connected. Thermal resistance θJA is 150°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | V– | Negative supply rail connection - must be tied to ground or negative reference in single/dual supply configurations. |
| 2 | +In A | Non-inverting input of Amplifier A - accepts signals up to (V–) – 0.2V and (V+) + 0.2V without damage. |
| 3 | –In A | Inverting input of Amplifier A - forms feedback node in standard op-amp configurations; high-impedance (1013Ω || 6pF). |
| 4 | Out A | Output of Amplifier A - drives capacitive loads ≤250pF directly in unity-gain buffer mode. |
| 5 | Out B | Output of Amplifier B - independent output with same rail-to-rail swing and drive capability as Out A. |
| 6 | –In B | Inverting input of Amplifier B - electrically isolated from Amplifier A; no crosstalk below –60dB at DC. |
| 7 | +In B | Non-inverting input of Amplifier B - identical input voltage range and bias current spec as +In A. |
| 8 | V+ | Positive supply rail connection - accepts 2.3V–5.5V; requires 0.01µF ceramic bypass capacitor to ground. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input with 200mV beyond rails | Enables full-scale signal acquisition from 0V to V+ in single-supply sensor interfaces without external level-shifting circuitry. |
| 20µA per amplifier quiescent current | Reduces total system standby power to <50µA for dual-amplifier configurations - critical for multi-year battery life in wireless smoke alarms. |
| 350kHz GBW with 0.17V/µs slew rate | Supports accurate amplification of 3kHz audio-band signals in speech-bandpass data acquisition systems using OPA2347 with ADS7822. |
| Specified from –55°C to +125°C | Validates parametric performance across full automotive under-hood and industrial control ambient conditions without derating. |
| Input bias current ±0.5pA typ | Maintains accuracy in high-Z pH sensor buffers and electrochemical gas sensor front-ends where leakage currents dominate error budgets. |
Applications
| Smoke Detectors | 2-Wire Transmitters |
|---|---|
Use Scenario: Ionization chamber current amplification and threshold comparison in residential/commercial smoke alarms. IC Role / Device Role / Timing Role: Dual op-amp configured as transimpedance amplifier (A) and comparator hysteresis generator (B) for reliable nuisance-alarm immunity. Use Value: Ultra-low IQ extends CR123A battery life beyond 10 years; rail-to-rail input captures full chamber current range (fA to nA) without clipping. | Use Scenario: 4–20mA loop transmitter signal conditioning and voltage-to-current conversion in process automation field devices. IC Role / Device Role / Timing Role: Precision instrumentation amplifier front-end (A) and loop driver buffer (B) operating from 24V loop supply with local 3.3V LDO. Use Value: 2mV max input offset ensures <0.01% FSR error in 16-bit DAC-driven transmitters; 2.3V min supply supports brownout-safe operation during loop dips. |
| CO Detectors | Portable Medical Sensors |
Use Scenario: Electrochemical carbon monoxide sensor signal amplification and temperature-compensated baseline correction. IC Role / Device Role / Timing Role: Low-noise transimpedance stage (A) and reference buffer (B) for ratiometric ADC measurement against internal bandgap. Use Value: 12µVPP 0.1Hz–10Hz noise prevents false CO alarms; ±0.5pA input bias avoids polarization errors in µA-level sensor currents. | Use Scenario: Electret microphone preamplification and bandpass filtering in handheld patient monitors and pulse oximeters. IC Role / Device Role / Timing Role: First-stage gain (A) and active bandpass filter (B) in 300Hz–3kHz speech band acquisition chain driving ADS7822 ADC. Use Value: 350kHz GBW enables flat group delay across audio band; 20µA IQ keeps total system current <250µA at 2.7V supply. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual rail-to-rail operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP6022-I/SN | Higher IQ (100µA), lower GBW (1MHz), wider supply (2.7–6V), same SOT-23-8 package | Better speed but 5× higher power - unsuitable for >5-year battery life; requires ≥2.7V supply | Select only when >350kHz bandwidth is required and battery life >3 years is not mandatory. |
| TLV2462IDR | Higher IQ (550µA), higher GBW (6.4MHz), rail-to-rail I/O, SO-8 only (no SOT-23-8 option) | Not pin-compatible; incompatible with space-constrained PCB layouts requiring SOT-23-8 footprint | Choose only if board redesign accommodates SO-8 and system power budget permits >1mA dual-amp quiescent draw. |
Compared with MCP6022-I/SN and TLV2462IDR, the OPA2347EA/3KG4 uniquely balances sub-35µA quiescent current, 350kHz bandwidth, –55°C to +125°C operation, and SOT-23-8 packaging - making it the sole option meeting simultaneous requirements for long-life, wide-temperature, space-constrained industrial safety sensors.
Availability
OPA2347EA/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 multi-year production cycles.
Supply support for OPA2347EA/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, embedded processing, and digital signal technologies, with decades of expertise in precision op-amps and industrial-grade signal chains.
The OPA347 family-including OPA2347EA/3KG4-is designed specifically for ultra-low-power, rail-to-rail signal conditioning in battery-operated safety and environmental monitoring systems demanding extended temperature reliability.
FAQ
What is the maximum operating temperature range for the OPA2347EA/3KG4?
The OPA2347EA/3KG4 is fully specified and tested from –55°C to +125°C, with absolute maximum ratings extending to –65°C to +150°C for storage and junction temperature. This makes OPA2347EA/3KG4 suitable for under-hood automotive and industrial control environments where thermal stress exceeds commercial-grade limits.
Does the OPA2347EA/3KG4 support true rail-to-rail input and output operation?
Yes, the OPA2347EA/3KG4 supports rail-to-rail input with common-mode range from (V–) – 0.2V to (V+) + 0.2V, and rail-to-rail output swing within 15mV of rails (RL = 100kΩ). Its complementary input stage enables operation 200mV beyond supply rails, while the class AB output stage maintains high open-loop gain even near saturation - confirmed in OPA2347EA/3KG4 electrical characteristics tables.
What is the quiescent current consumption of the OPA2347EA/3KG4 per amplifier?
The OPA2347EA/3KG4 draws 20µA typical and 34µA maximum quiescent current per amplifier at +25°C, rising to 38µA maximum over full temperature range. This ultra-low IQ enables dual-amplifier operation at <70µA total - essential for multi-year battery life in portable safety equipment where OPA2347EA/3KG4 is commonly deployed.
Is the OPA2347EA/3KG4 pin-compatible with other dual op-amps in SOT-23-8 packages?
No - the OPA2347EA/3KG4 uses a non-standard SOT-23-8 pinout (V–, +In A, –In A, Out A, Out B, –In B, +In B, V+), differing from industry conventions like the LMV358 or MCP6022. Engineers must verify layout compatibility; direct replacement requires schematic and PCB revision. This pin assignment is explicitly defined in TI's SBOS167D datasheet for OPA2347EA/3KG4.
Can the OPA2347EA/3KG4 drive capacitive loads without external compensation?
Yes, the OPA2347EA/3KG4 is unity-gain stable and can directly drive up to 250pF pure capacitive load in unity-gain buffer configuration. For larger loads or inverting configurations, a 10Ω–20Ω series resistor at the output or 4pF–6pF feedback capacitor (CFB) is recommended - design guidance for OPA2347EA/3KG4 is provided in TI's Application Information section of SBOS167D.
OPA2347EA/3KG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- microPOWER™
- Package/Case:
- SOT-23-8
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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/3KG4 FAQ
1.How can I place an order for OPA2347EA/3KG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA2347EA/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 OPA2347EA/3KG4 reliable?
The price and inventory of OPA2347EA/3KG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA2347EA/3KG4 is usually 5 days.
3.What payment methods are accepted for OPA2347EA/3KG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA2347EA/3KG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA2347EA/3KG4?
OPA2347EA/3KG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA2347EA/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 OPA2347EA/3KG4?
For technical support, including OPA2347EA/3KG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA2347EA/3KG4 requirements.
6.How does Aetrix verify that OPA2347EA/3KG4 is sourced from the original manufacturer or authorized distributors?
All OPA2347EA/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 OPA2347EA/3KG4 meets industry standards.
7.What is the process for return or replacement of OPA2347EA/3KG4?
All OPA2347EA/3KG4 units undergo pre-shipment inspection (PSI). If there is an issue with OPA2347EA/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 OPA2347EA/3KG4 part is unused and in its original packaging.
Return procedure for OPA2347EA/3KG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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