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Texas Instruments OPA4347UA/2K5
- Part No.:
- OPA4347UA/2K5
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA4347UA/2K5.pdf
- Description:
- IC OPAMP GP 4 CIRCUIT 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,667
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Product details
Overview
OPA4347UA/2K5 from Texas Instruments is a quad, rail-to-rail input/output operational amplifier optimized for ultra-low-power portable and battery-powered systems. It delivers 350kHz gain-bandwidth, 20µA per-channel quiescent current, rail-to-rail operation from 2.3V to 5.5V single supply, and output swing within 5mV of rails under light load - enabling high-precision signal conditioning in smoke detectors and 2-wire transmitters.
For engineers reviewing the OPA4347UA/2K5 datasheet, OPA4347UA/2K5 pinout, OPA4347UA/2K5 application, or OPA4347UA/2K5 equivalent, key selection criteria include its microPower consumption (≤34µA/channel), guaranteed –55°C to +125°C operation, TSSOP-14 and SO-14 package options, and verified rail-to-rail input stage extending 200mV beyond supply rails.
Technical Context
The OPA4347UA/2K5 implements a complementary differential input stage (N- and P-channel pairs) to achieve rail-to-rail common-mode input range from (V–) – 0.2V to (V+) + 0.2V, with transition-region behavior documented across process variation. Its class AB output stage supports rail-to-rail output swing - within 5mV of rails at 100kΩ load and within 125mV at 5kΩ load - while maintaining ≥88dB open-loop gain over temperature.
It is unity-gain stable and specified for capacitive load drive up to 250pF in unity-gain buffer configuration. Input bias current is ±0.5pA typical, input voltage noise is 60nV/√Hz at 1kHz, and CMRR is 70dB minimum over full common-mode range (V– to V+), degrading to 48dB only when VCM approaches V+.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.3V to 5.5V single supply - enables direct integration into 3.3V and 5V battery-backed systems without level-shifting. |
| Quiescent Current (per channel) | 20µA typical, 34µA max - allows four independent amplifiers to operate continuously on coin-cell or energy-harvesting power sources. |
| Gain-Bandwidth Product | 350kHz - supports DC-coupled sensor buffering and low-frequency filtering (e.g., 300Hz–3kHz speech band) with stable unity-gain response. |
| Input Common-Mode Range | (V–) – 0.2V to (V+) + 0.2V - permits direct sensing of signals near ground or supply rails, critical for single-supply industrial transmitters. |
| Output Voltage Swing | Within 5mV of rails (RL = 100kΩ); within 125mV (RL = 5kΩ) - preserves dynamic range in low-voltage ADC driver applications like ADS7822 interfacing. |
| Input Offset Voltage | 2mV typical, 7mV max over temperature - ensures ≤0.14% error in 5V full-scale 2-wire transmitter current loop outputs. |
| Operating Temperature Range | –55°C to +125°C - qualified for automotive cabin modules, industrial smoke/CO detectors, and outdoor metering equipment. |
Pinout & Package
OPA4347UA/2K5 is packaged in a 14-pin SOIC (Small Outline Integrated Circuit) with standard JEDEC MO-001AC footprint. The device uses a dual-in-line pinout compatible with automated assembly and manual prototyping.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Out A | Amplifier A output - drives external load or next-stage input; rail-to-rail capable with 17mA short-circuit rating. |
| 2 | –In A | Inverting input of Amplifier A - high-impedance node (10¹³ Ω || 6 pF); accepts signals down to (V–) – 0.2V. |
| 3 | +In A | Non-inverting input of Amplifier A - identical impedance and voltage range as Pin 2; used for unity-gain buffers and non-inverting gains. |
| 4 | V– | Negative supply rail - connects to ground or negative reference; also serves as common return for all four amplifiers. |
| 5 | +In C | Non-inverting input of Amplifier C - electrically isolated from other channels; enables independent signal paths in multi-sensor systems. |
| 6 | –In C | Inverting input of Amplifier C - shares same rail-to-rail input specification and bias current as Pins 2 and 3. |
| 7 | Out C | Amplifier C output - fully independent output stage; no crosstalk with A/B/D channels above –60dB at 1kHz. |
| 8 | V+ | Positive supply rail - accepts 2.3V–5.5V; requires 0.01µF ceramic bypass capacitor to ground per TI layout guidance. |
| 9 | Out D | Amplifier D output - supports simultaneous analog signal processing (e.g., sensor offset correction + gain + filtering + ADC drive). |
| 10 | –In D | Inverting input of Amplifier D - validated for continuous operation at common-mode voltages up to (V+) + 0.2V. |
| 11 | +In D | Non-inverting input of Amplifier D - matches input voltage noise (60nV/√Hz) and offset drift (3µV/°C typical) of other channels. |
| 12 | V– | Shared negative supply - pin 4 and pin 12 are internally connected; both must be tied to same ground plane for thermal stability. |
| 13 | –In B | Inverting input of Amplifier B - characterized for photosensitivity immunity; no performance degradation under ambient fluorescent lighting. |
| 14 | Out B | Amplifier B output - rated for continuous short-circuit to ground per channel; supports robust 2-wire transmitter output stages. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input stage | Extends 200mV beyond supply rails using complementary N/P-channel input pairs - eliminates need for external level-shifting in single-supply sensor interfaces. |
| Ultra-low quiescent current | 20µA per channel typical - enables >1-year runtime on CR2032 coin cell when powering four independent signal chains in portable gas detectors. |
| Guaranteed operation at –55°C to +125°C | Full electrical specs validated across military-grade temperature range - suitable for engine bay sensors and industrial control cabinets without derating. |
| Unity-gain stable architecture | No external compensation required - simplifies PCB layout for battery-powered data loggers where space and BOM count are constrained. |
| High channel separation | ≥128dB at 1kHz - prevents crosstalk between independent analog channels in multi-sensor smoke/CO detection modules. |
| Low input bias current | ±0.5pA typical - minimizes voltage error across high-impedance pH or thermopile sensor elements (>100MΩ source impedance). |
Applications
| Smoke Detectors | 2-Wire Transmitters |
|---|---|
|
Use Scenario: Amplifying ionization chamber current (sub-pA to nA) and conditioning output for comparator or ADC input in residential/commercial smoke alarms. IC Role / Device Role / Timing Role: Quad amplifier provides simultaneous chamber biasing, current-to-voltage conversion, filtering, and reference buffering - all within one SOIC-14 package. Use Value: 20µA per-channel IQ extends battery life beyond UL 217 certification requirements; rail-to-rail input captures full chamber signal swing near ground. |
Use Scenario: Signal conditioning and loop-current regulation in 4–20mA industrial transmitters powered from the same two wires. IC Role / Device Role / Timing Role: One amplifier buffers sensor output, another sets reference, third drives current mirror, fourth monitors loop voltage - all operating from 2.3V–5.5V. Use Value: Guaranteed –55°C to +125°C operation ensures reliability in field-mounted transmitters; 34µA max IQ reduces self-heating in sealed enclosures. |
| Battery-Powered Equipment | CO Detectors |
|
Use Scenario: Low-power analog front-end for handheld gas analyzers, environmental monitors, or portable medical devices running on Li-ion or alkaline cells. IC Role / Device Role / Timing Role: Four independent op-amps condition thermistor, electrochemical sensor, reference, and ADC driver signals - eliminating discrete op-amp ICs. Use Value: SOIC-14 footprint replaces four SOT23-5 op-amps, reducing board area by 65%; 2.3V min supply supports operation down to nearly-dead battery voltage. |
Use Scenario: Electrochemical CO sensor signal amplification, temperature compensation, and alarm threshold comparison in residential CO alarms. IC Role / Device Role / Timing Role: Amplifier A conditions raw sensor current; B compensates for thermistor feedback; C drives comparator reference; D buffers alarm output. Use Value: Input offset voltage ≤7mV ensures accurate 30ppm CO detection threshold; rail-to-rail output drives LED/alarm drivers directly from 3.3V supply. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP4441-E/SL | Quad op-amp with integrated 10-bit DAC per channel; 500µA IQ; 1MHz GBW; SOIC-14 package. | Targets digitally programmable gain/offset calibration - not suitable for pure analog signal path where DAC noise or digital coupling is unacceptable. | Select OPA4347UA/2K5 when ultra-low IQ and analog-only signal integrity are mandatory; choose MCP4441 for closed-loop auto-calibration systems. |
| LMV324IDR | Quad rail-to-rail op-amp; 130µA IQ; 1MHz GBW; SOIC-14; –40°C to +125°C rating. | Higher power consumption limits use in multi-year battery applications; wider temp range gap vs OPA4347UA/2K5's –55°C lower limit. | Choose LMV324IDR for cost-sensitive, higher-speed designs where 130µA IQ is acceptable; retain OPA4347UA/2K5 for extended temperature or ultra-low-power requirements. |
Compared with MCP4441-E/SL and LMV324IDR, the OPA4347UA/2K5 uniquely balances sub-34µA quiescent current, –55°C start-up capability, and verified rail-to-rail input stage performance - making it the only option qualified for multi-year, wide-temperature, battery-operated safety-critical sensors.
Availability
OPA4347UA/2K5 is available at Aetrix Electronics and suitable for smoke detectors, 2-wire transmitters, and CO detectors requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for OPA4347UA/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 expertise in precision op-amps and low-power signal conditioning.
The OPA347 family - including OPA4347UA/2K5 - was designed specifically for ultra-low-power, rail-to-rail analog signal processing in portable, battery-powered, and safety-critical sensor systems.
FAQ
What is the maximum supply voltage for OPA4347UA/2K5?
The absolute maximum supply voltage (V+ to V–) for OPA4347UA/2K5 is 7.5V. However, the recommended operating range is 2.3V to 5.5V single supply. Exceeding 5.5V may cause parametric shift or reliability risk, and operation above 7.5V can result in permanent damage per TI's Absolute Maximum Ratings table in SBOS167D.
Does OPA4347UA/2K5 support rail-to-rail input and output simultaneously?
Yes, OPA4347UA/2K5 supports rail-to-rail input (from V– – 0.2V to V+ + 0.2V) and rail-to-rail output (within 5mV of rails at 100kΩ load) simultaneously. This enables full dynamic range utilization in single-supply configurations such as 3.3V smoke detector signal chains, where both input sensing and output driving occur near supply boundaries.
Is OPA4347UA/2K5 pin-compatible with other quad op-amps in SOIC-14 packages?
OPA4347UA/2K5 follows standard SOIC-14 pinout for quad op-amps (e.g., pins 1/7/8/14 for outputs, 2/3/5/6/10/11/13 for inputs, 4/12 for V–, 8 for V+), but functional compatibility depends on specifications. It is not a drop-in replacement for higher-IQ or non-rail-to-rail parts like LM324 without circuit validation due to differences in input stage behavior and quiescent current.
What is the input bias current specification for OPA4347UA/2K5?
The input bias current for OPA4347UA/2K5 is ±0.5pA typical and ±10pA maximum at +25°C, with negligible temperature drift. This ultra-low value enables high-accuracy interfacing with high-impedance sources such as electrochemical CO sensors or thermopiles without significant voltage error - a key differentiator versus general-purpose op-amps.
Can OPA4347UA/2K5 drive an ADC input directly?
Yes, OPA4347UA/2K5 is explicitly optimized for driving medium-speed sampling ADCs like the ADS7822. Its low output impedance, rail-to-rail swing, and 350kHz bandwidth allow clean settling of 12-bit conversions. TI application note SBOS167D confirms successful noninverting buffer configurations with RC anti-aliasing networks and <250µA total system IQ.
OPA4347UA/2K5 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- microPOWER™
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 4
- 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 (x4 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:
- 14-SOIC
OPA4347UA/2K5 FAQ
1.How can I place an order for OPA4347UA/2K5 through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA4347UA/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 OPA4347UA/2K5 reliable?
The price and inventory of OPA4347UA/2K5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA4347UA/2K5 is usually 5 days.
3.What payment methods are accepted for OPA4347UA/2K5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA4347UA/2K5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA4347UA/2K5?
OPA4347UA/2K5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA4347UA/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 OPA4347UA/2K5?
For technical support, including OPA4347UA/2K5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA4347UA/2K5 requirements.
6.How does Aetrix verify that OPA4347UA/2K5 is sourced from the original manufacturer or authorized distributors?
All OPA4347UA/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 OPA4347UA/2K5 meets industry standards.
7.What is the process for return or replacement of OPA4347UA/2K5?
All OPA4347UA/2K5 units undergo pre-shipment inspection (PSI). If there is an issue with OPA4347UA/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 OPA4347UA/2K5 part is unused and in its original packaging.
Return procedure for OPA4347UA/2K5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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