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Texas Instruments OPA2347UA/2K5
- Part No.:
- OPA2347UA/2K5
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA2347UA/2K5.pdf
- Description:
- IC OPAMP GP 2 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:43,615
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Product details
Overview
OPA2347UA/2K5 from Texas Instruments is a dual, rail-to-rail input/output, microPower operational amplifier in SOIC-8 package, delivering 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/2K5 datasheet, OPA2347UA/2K5 pinout, OPA2347UA/2K5 application, or OPA2347UA/2K5 equivalent, key selection criteria include ultra-low IQ, rail-to-rail swing at sub-3V operation, input voltage range extending 200mV beyond rails, and guaranteed –55°C to +125°C performance across SOIC-8 packaging.
Technical Context
The OPA2347UA/2K5 implements a complementary differential input stage (N- and P-channel pairs) enabling rail-to-rail common-mode input range from (V–) – 0.2V to (V+) + 0.2V, with transition region behavior documented between (V+) – 1.65V and (V+) – 0.95V. Its class AB output stage achieves 5mV rail-to-rail swing into 100kΩ loads.
It is unity-gain stable and specified for capacitive load drive up to 250pF in buffer configuration. Input bias current remains ≤ ±10pA at 25°C, and open-loop gain exceeds 100dB (RL = 100kΩ) across its full operating temperature range.
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 typical - supports >1-year operation on coin-cell batteries in portable safety sensors. |
| Gain-Bandwidth Product | 350kHz - sufficient for conditioning low-frequency sensor signals (e.g., CO detector electrochemical cells, smoke chamber ion currents). |
| Input Offset Voltage | 2mV max at 25°C - ensures <0.1% error in 2-wire transmitter current-loop output stages. |
| Output Swing (vs Rail) | 5mV into 100kΩ - preserves >99% dynamic range in 2.5V-supplied ADC front-ends like ADS7822. |
| Common-Mode Rejection | 70dB min (VCM < V+ – 1.7V) - maintains accuracy in noisy industrial 2-wire loop environments. |
| Operating Temperature | –55°C to +125°C - qualified for under-hood automotive and industrial control cabinet deployment. |
Pinout & Package
OPA2347UA/2K5 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 MSL Level-2 moisture sensitivity rating.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Out A | Amplifier A output - drives external load or ADC input; rail-to-rail capable with <15mV drop at 1mA sink/source. |
| 2 | –In A | Inverting input of Amp A - high-impedance node (10¹³ Ω || 6pF); accepts signals down to V– – 0.2V. |
| 3 | +In A | Non-inverting input of Amp A - same impedance and rail extension as Pin 2; used for unity-gain buffers or sensor reference paths. |
| 4 | V– | Negative supply terminal - connects to ground or negative rail; supports single-supply operation when tied to GND. |
| 5 | +In B | Non-inverting input of Amp B - electrically isolated from Amp A; enables dual-channel signal conditioning on one die. |
| 6 | –In B | Inverting input of Amp B - identical specs to Pin 2; allows independent feedback networks per channel. |
| 7 | Out B | Amplifier B output - fully independent output stage; shares no internal nodes with Out A. |
| 8 | V+ | Positive supply terminal - accepts 2.3V–5.5V; bypassing with 0.01µF ceramic capacitor is mandatory for stability. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input range | Extends 200mV beyond V– and V+, enabling direct interfacing with sensors whose outputs exceed supply rails - critical for smoke chamber ion current monitoring. |
| Ultra-low quiescent current | 20µA per amplifier at 25°C - reduces total system standby power to <50µA in dual-sensor configurations, extending battery life by >3× vs legacy op amps. |
| Unity-gain stability | Guaranteed stable with CL ≤ 250pF in buffer mode - eliminates need for external compensation in ADC driver or sensor filter applications. |
| High CMRR at low VCM | 70dB minimum when VCM < V+ – 1.7V - rejects common-mode noise in 4–20mA loop receivers where reference and signal share return path. |
| Specified over extended temp | Full electrical performance validated from –55°C to +125°C - removes derating uncertainty in automotive cabin or industrial enclosure deployments. |
Applications
| Smoke Detectors | 2-Wire Transmitters |
|---|---|
|
Use Scenario: Amplifying ultra-low current (pA–nA) ionization chamber signals in residential/commercial smoke alarms. IC Role / Device Role / Timing Role: Dual-channel transimpedance amplifier - Amp A conditions chamber current; Amp B buffers reference voltage for comparator threshold. Use Value: 20µA IQ enables multi-year CR123A battery life; rail-to-rail input captures full ion current swing even at 2.4V end-of-life battery voltage. |
Use Scenario: Signal conditioning and loop-current regulation in industrial 4–20mA field transmitters for pressure/temperature sensors. IC Role / Device Role / Timing Role: Dual op amp implementing precision I/V conversion and voltage-controlled current source (VCCS) with HART modulation support. Use Value: 2.3V minimum supply allows operation directly from loop-powered 12V–36V sources; 70dB CMRR suppresses EMI-induced errors in factory floor wiring. |
| Battery-Powered Gas Sensors | Portable Medical Instrumentation |
|
Use Scenario: Front-end amplification for electrochemical CO or NO₂ sensors in handheld air quality monitors. IC Role / Device Role / Timing Role: Low-noise, low-drift amplifier driving 12-bit SAR ADCs (e.g., ADS7822); second amp used for reference buffering and offset trimming. Use Value: 12µVPP 0.1Hz–10Hz input noise prevents signal burial beneath sensor baseline drift; 3µV/°C offset drift minimizes calibration frequency. |
Use Scenario: Biopotential signal acquisition (ECG, EMG) in wearable diagnostic patches powered by Li-ion coin cells. IC Role / Device Role / Timing Role: Dual instrumentation-grade amplifier - first stage provides high-Z electrode interface and gain; second stage filters and level-shifts for ADC input. Use Value: Input bias current ≤ ±10pA avoids electrode polarization errors; rail-to-rail output maximizes SNR into 2.5V ADCs without external level-shifting circuitry. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual, rail-to-rail, micropower operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP6022-I/SN | Higher IQ (100µA), wider GBW (1MHz), but only specified to +85°C; SOIC-8 pinout matches OPA2347UA/2K5. | Not suitable for –55°C or +125°C deployments; better for higher-speed portable test equipment where temperature range is less extreme. | Select when bandwidth >500kHz is required and extended temperature qualification is unnecessary. |
| AD8602ARZ | Lower offset (250µV max), lower noise (12nV/√Hz), but IQ = 350µA and min supply = 2.7V - incompatible with 2.3V operation. | Preferred for precision medical front-ends where offset and noise dominate; not viable for low-voltage battery cutoff scenarios. | Choose when µV-level DC accuracy outweighs battery life - e.g., clinical-grade glucose meters requiring <0.05% linearity. |
Compared with MCP6022-I/SN and AD8602ARZ, the OPA2347UA/2K5 uniquely balances ultra-low IQ (20µA), 2.3V operation, and full –55°C to +125°C qualification - making it irreplaceable in long-life, wide-temperature industrial safety systems where power and ruggedness are co-primary constraints.
Availability
OPA2347UA/2K5 is available at Aetrix Electronics and suitable for smoke detectors, 2-wire transmitters, and portable gas sensors requiring stable component supply across automotive, industrial, and building safety markets.
Supply support for OPA2347UA/2K5 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 heritage in precision op amp design and industrial-grade reliability validation.
The OPA347 family - including OPA2347UA/2K5 - was engineered specifically for ultra-low-power, rail-to-rail signal conditioning in battery-constrained safety-critical systems such as fire and gas detection hardware.
FAQ
What is the maximum capacitive load the OPA2347UA/2K5 can drive in unity-gain buffer configuration?
The OPA2347UA/2K5 is specified to drive up to 250pF of pure capacitive load while maintaining stability in unity-gain buffer configuration. For loads exceeding this value, a 10Ω–20Ω series resistor between the output and capacitive load is recommended to suppress ringing without degrading DC accuracy - a technique validated in TI's SBOS167D datasheet Figure 6. This capability makes OPA2347UA/2K5 suitable for direct connection to sampling ADC inputs like the ADS7822.
Does the OPA2347UA/2K5 support true rail-to-rail input when operating from a 2.3V supply?
Yes - the OPA2347UA/2K5 maintains rail-to-rail input operation down to 2.3V supply, with common-mode range extending from (V–) – 0.2V to (V+) + 0.2V. At 2.3V, this means usable input range spans –0.2V to +2.5V, enabling accurate sensing of signals that swing below ground or above V+ in low-voltage battery systems. This behavior is confirmed across –55°C to +125°C in the Electrical Characteristics table of SBOS167D.
What is the thermal resistance (θJA) of the OPA2347UA/2K5 in SOIC-8 package?
The OPA2347UA/2K5 in SOIC-8 package has a junction-to-ambient thermal resistance (θJA) of 150°C/W, as specified in the Thermal Resistance table of SBOS167D. This value assumes standard JEDEC 2-layer board layout (1-inch² copper pad). Under worst-case 5.5V/34µA operation (187µW per amplifier), self-heating remains <0.03°C - confirming negligible thermal impact in typical low-power applications.
Is the OPA2347UA/2K5 pin-compatible with other dual op amps in SOIC-8 package?
The OPA2347UA/2K5 follows the industry-standard SOIC-8 dual op amp pinout (V+, Out B, –In B, +In B, +In A, –In A, Out A, V–), matching devices like LM2904, TL072, and MCP6022. However, functional compatibility requires verification of supply range, rail-to-rail capability, and quiescent current - as non-rail-to-rail or higher-IQ alternatives may fail to meet system-level battery life or dynamic range requirements despite physical pin alignment.
How does photosensitivity affect the OPA2347UA/2K5, and is it relevant to this part?
Photosensitivity applies only to the WCSP-8 variants (OPA2347YED/YZDR), which use bump-on-pad construction exposing the silicon die. The OPA2347UA/2K5 is in SOIC-8 plastic package with full light shielding - its input bias current (±10pA max) is unaffected by ambient light. TI explicitly excludes photosensitivity concerns for D-package devices in SBOS167D Section "PHOTOSENSITIVITY", confirming OPA2347UA/2K5 is safe for unshielded PCB layouts.
OPA2347UA/2K5 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:
- 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:
- 8-SOIC
OPA2347UA/2K5 FAQ
1.How can I place an order for OPA2347UA/2K5 through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA2347UA/2K5 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/2K5 reliable?
The price and inventory of OPA2347UA/2K5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA2347UA/2K5 is usually 5 days.
3.What payment methods are accepted for OPA2347UA/2K5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA2347UA/2K5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA2347UA/2K5?
OPA2347UA/2K5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA2347UA/2K5 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/2K5?
For technical support, including OPA2347UA/2K5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA2347UA/2K5 requirements.
6.How does Aetrix verify that OPA2347UA/2K5 is sourced from the original manufacturer or authorized distributors?
All OPA2347UA/2K5 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/2K5 meets industry standards.
7.What is the process for return or replacement of OPA2347UA/2K5?
All OPA2347UA/2K5 units undergo pre-shipment inspection (PSI). If there is an issue with OPA2347UA/2K5, 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/2K5 part is unused and in its original packaging.
Return procedure for OPA2347UA/2K5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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