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Texas Instruments OPA2347UA/2K5G4
- Part No.:
- OPA2347UA/2K5G4
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA2347UA/2K5G4.pdf
- Description:
- IC OPAMP GP 2 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,730
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Product details
Overview
OPA2347UA/2K5G4 from Texas Instruments is a dual, rail-to-rail input/output microPower operational amplifier in SOIC-8 package, specified for –55°C to +125°C operation, with 350kHz gain-bandwidth, 20µA per amplifier quiescent current, and 2.3V to 5.5V single-supply operation - ideal for battery-powered smoke detectors and 2-wire industrial transmitters.
For engineers reviewing the OPA2347UA/2K5G4 datasheet, OPA2347UA/2K5G4 pinout, OPA2347UA/2K5G4 application, or OPA2347UA/2K5G4 equivalent, key selection criteria include rail-to-rail I/O swing (within 5mV of rails at light load), ultra-low IQ (20µA typ), input common-mode range extending 200mV beyond rails, and guaranteed operation across extended temperature.
Technical Context
The OPA2347UA/2K5G4 employs complementary N-channel and P-channel input differential pairs 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 within (V+) – 1.65V to (V+) – 0.95V. Its class AB output stage delivers rail-to-rail output swing, maintaining >100dB open-loop gain into 100kΩ loads.
It is unity-gain stable and optimized for driving medium-speed SAR ADCs like the ADS7822, supporting low-noise signal conditioning in portable instrumentation. Input bias current is ±0.5pA typ at 25°C, and input voltage noise is 60nV/√Hz at 1kHz - enabling high-impedance sensor interfacing without significant Johnson or bias-current noise contribution.
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 battery-powered systems without level-shifting. |
| Quiescent Current (per amp) | 20µA typical - enables multi-year operation on coin-cell batteries in CO/smoke detectors. |
| Gain-Bandwidth Product | 350kHz - sufficient for anti-aliasing filtering and buffering of <100kHz sensor signals in portable data acquisition. |
| Input Offset Voltage | 2mV max at 25°C - ensures ≤0.04% error in 50mV full-scale gas sensor outputs without trimming. |
| Output Swing (RL = 100kΩ) | Within 5mV of rails - maximizes dynamic range in low-voltage (2.3V) supply applications such as handheld meters. |
| Input Common-Mode Range | (V–) – 0.2V to (V+) + 0.2V - allows direct sensing of signals below ground or above V+ in 2-wire transmitter front-ends. |
| Operating Temperature | –55°C to +125°C - qualified for under-hood automotive and industrial process monitoring environments. |
Pinout & Package
OPA2347UA/2K5G4 is housed in an 8-pin SOIC (Small Outline Integrated Circuit) package with standard JEDEC MS-012AC footprint (5.3mm × 6.2mm), RoHS-compliant NiPdAu lead finish, and Moisture Sensitivity Level 2 (260°C peak reflow).
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Out A | Amplifier A output - drives ADC input or transducer load; rail-to-rail swing supports full-scale utilization of 12-bit converters. |
| 2 | –In A | Inverting input of Amp A - accepts feedback network or sensor bridge output; high impedance (10¹³ Ω) minimizes loading. |
| 3 | +In A | Non-inverting input of Amp A - connects to reference or high-Z sensor node; common-mode range extends beyond rails for ground-referenced inputs. |
| 4 | V– | Negative supply pin - tied to GND in single-supply configurations; must be bypassed with 0.01µF ceramic capacitor. |
| 5 | +In B | Non-inverting input of Amp B - used for second channel in dual-sensor systems (e.g., differential gas detection). |
| 6 | –In B | Inverting input of Amp B - configured for precision current-to-voltage conversion in 4–20mA loop receivers. |
| 7 | Out B | Amplifier B output - provides independent signal path for auxiliary functions (e.g., temperature compensation or status monitoring). |
| 8 | V+ | Positive supply pin - accepts 2.3–5.5V; internal ESD protection clamps inputs to rails ±0.5V. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input | Common-mode range extends 200mV beyond V+ and V– - enables direct interface to 0–V+ sensor outputs without external level shifters. |
| Rail-to-rail output | Swings to within 5mV of rails into 100kΩ - preserves >99.5% of available voltage headroom in 3.3V systems. |
| Ultra-low quiescent current | 20µA per amplifier - reduces total system standby power to <50µA for dual-channel battery-operated devices. |
| Unity-gain stable | No external compensation required - simplifies layout in space-constrained portable PCBs and eliminates stability tuning effort. |
| Extended temperature range | Specified from –55°C to +125°C - meets industrial and automotive under-hood requirements without derating. |
| Low input bias current | ±0.5pA typical - prevents significant voltage drop across >10MΩ sensor elements (e.g., electrochemical gas cells). |
Applications
| Smoke Detector Front-End | 2-Wire 4–20mA Transmitter |
|---|---|
|
Use Scenario: Amplifying weak ionization chamber current (pA–nA range) in residential smoke alarms powered by 9V alkaline batteries. IC Role / Device Role / Timing Role: Dual op-amp configured as transimpedance amplifier (Amp A) and reference buffer (Amp B) for analog signal conditioning. Use Value: 20µA IQ enables >5-year battery life; rail-to-rail I/O captures full dynamic range of smoke-induced current pulses without clipping. |
Use Scenario: Converting 4–20mA loop current to 0.5–2.5V for microcontroller ADC input in industrial pressure sensors. IC Role / Device Role / Timing Role: Precision current-to-voltage converter with matched dual amplifiers for loop power management and signal isolation. Use Value: Input offset voltage ≤2mV ensures ≤0.1% full-scale error; extended temperature rating maintains accuracy in factory-floor environments. |
| Portable CO Detector | Electret Microphone Preamp |
|
Use Scenario: Signal conditioning for electrochemical carbon monoxide sensors operating on AAA batteries in handheld safety instruments. IC Role / Device Role / Timing Role: Low-noise, low-power dual amplifier providing sensor biasing, amplification, and ADC drive in compact form factor. Use Value: 60nV/√Hz input noise density preserves SNR of µV-level CO sensor outputs; 2.3V min supply supports aging battery operation. |
Use Scenario: High-gain, low-noise preamplification of electret microphone output in voice-enabled IoT devices with 3.3V supply. IC Role / Device Role / Timing Role: First-stage gain block (G = 100) with rail-to-rail output driving ADS7822 12-bit ADC sampling at 50ksps. Use Value: 350kHz GBW supports flat frequency response up to 3kHz speech band; 20µA IQ keeps total system current <250µA. |
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), wider GBW (1MHz), same SOIC-8 package and rail-to-rail I/O. | Better for higher-frequency sensor interfaces (>100kHz), but reduces battery life by 5× vs OPA2347UA/2K5G4. | Select when bandwidth >500kHz is required and power budget allows ≥100µA per amp. |
| TSV912IDT | Lower IQ (38µA), lower VOS (1.5mV max), same SOIC-8, but only rated to +125°C (not –55°C). | Suitable for commercial-grade portable equipment, but not qualified for extended industrial temperature range. | Select for cost-sensitive consumer applications where –55°C operation is unnecessary. |
Compared with MCP6022-I/SN and TSV912IDT, the OPA2347UA/2K5G4 uniquely balances ultra-low power (20µA), extended temperature (–55°C to +125°C), and adequate bandwidth (350kHz) for long-life, ruggedized industrial sensing - making it optimal for battery-powered safety-critical systems where reliability trumps raw speed.
Availability
OPA2347UA/2K5G4 is available at Aetrix Electronics and suitable for smoke detectors, 2-wire transmitters, portable CO monitors, and electret microphone preamps requiring stable component supply across automotive, industrial, and medical OEM programs.
Supply support for OPA2347UA/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 solutions, with over 50 years of innovation in precision amplifiers and low-power signal chains.
The OPA2347UA/2K5G4 belongs to TI's OPA347 family of microPower rail-to-rail op amps, designed specifically for battery-operated safety and environmental monitoring systems demanding ultra-low IQ, wide temperature operation, and robust rail-to-rail performance.
FAQ
What is the maximum operating supply voltage for OPA2347UA/2K5G4?
The absolute maximum supply voltage (V+ to V–) for OPA2347UA/2K5G4 is 7.5V. However, the recommended operating range is 2.3V to 5.5V. Exceeding 5.5V may cause parametric degradation or reliability risk, and operation above 7.5V risks permanent damage per TI's Absolute Maximum Ratings table in SBOS167D.
Does OPA2347UA/2K5G4 support true rail-to-rail input and output simultaneously?
Yes, OPA2347UA/2K5G4 supports rail-to-rail input (common-mode range from V– – 0.2V to V+ + 0.2V) and rail-to-rail output (swing within 5mV of rails into 100kΩ). However, input performance (CMRR, PSRR, offset) degrades in the 400mV transition region near V+ – 1.3V, so simultaneous full-rail operation requires careful biasing outside that zone.
Can OPA2347UA/2K5G4 drive capacitive loads directly?
OPA2347UA/2K5G4 can directly drive up to 250pF in unity-gain configuration. For larger capacitive loads (e.g., ADC input capacitance + PCB parasitics >250pF), TI recommends adding a 10Ω–20Ω series resistor at the output or using a small feedback capacitor (4–6pF) in inverting configurations to maintain phase margin and prevent overshoot.
Is OPA2347UA/2K5G4 pin-compatible with other dual op-amps in SOIC-8?
OPA2347UA/2K5G4 uses the industry-standard SOIC-8 pinout (pin 1 = Out A, pin 2 = –In A, pin 3 = +In A, pin 4 = V–, pin 5 = +In B, pin 6 = –In B, pin 7 = Out B, pin 8 = V+), matching LM358, TLV2372, and MCP6022. However, electrical characteristics (IQ, VOS, GBW) differ - verify design margins before substitution.
What is the thermal resistance (θJA) of OPA2347UA/2K5G4 in SOIC-8 package?
The junction-to-ambient thermal resistance (θJA) for OPA2347UA/2K5G4 in SOIC-8 package is 150°C/W, as specified in the Electrical Characteristics table of SBOS167D. This value assumes standard JEDEC 2-layer board conditions; actual θJA improves with added copper pour and thermal vias.
OPA2347UA/2K5G4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- microPOWER™
- 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:
- 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:
- 8-SOIC
OPA2347UA/2K5G4 FAQ
1.How can I place an order for OPA2347UA/2K5G4 through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA2347UA/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 OPA2347UA/2K5G4 reliable?
The price and inventory of OPA2347UA/2K5G4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA2347UA/2K5G4 is usually 5 days.
3.What payment methods are accepted for OPA2347UA/2K5G4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA2347UA/2K5G4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA2347UA/2K5G4?
OPA2347UA/2K5G4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA2347UA/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 OPA2347UA/2K5G4?
For technical support, including OPA2347UA/2K5G4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA2347UA/2K5G4 requirements.
6.How does Aetrix verify that OPA2347UA/2K5G4 is sourced from the original manufacturer or authorized distributors?
All OPA2347UA/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 OPA2347UA/2K5G4 meets industry standards.
7.What is the process for return or replacement of OPA2347UA/2K5G4?
All OPA2347UA/2K5G4 units undergo pre-shipment inspection (PSI). If there is an issue with OPA2347UA/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 OPA2347UA/2K5G4 part is unused and in its original packaging.
Return procedure for OPA2347UA/2K5G4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
OPA2347UA/2K5G4 Tags
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