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Texas Instruments OPA347PAG4
- Part No.:
- OPA347PAG4
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
OPA347PAG4.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,580
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Product details
Overview
OPA347PAG4 from Texas Instruments is a single-channel, micropower, rail-to-rail input/output operational amplifier in an 8-pin PDIP package. It operates from 2.3V to 5.5V single supply, delivers 350kHz gain-bandwidth, consumes only 20µA quiescent current per channel, and achieves output swing within 5mV of rails under light load - ideal for battery-powered smoke detectors and portable instrumentation.
For engineers reviewing the OPA347PAG4 datasheet, OPA347PAG4 pinout, OPA347PAG4 application, or OPA347PAG4 equivalent, key selection criteria include its ultra-low IQ (20µA), rail-to-rail I/O capability extending 200mV beyond rails, guaranteed operation from –55°C to +125°C, and compatibility with 2-wire transmitter signal conditioning circuits requiring high CMRR (>70dB) and low input bias current (±0.5pA).
Technical Context
The OPA347PAG4 uses 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. Its class AB output stage supports rail-to-rail output swing, delivering ±17mA short-circuit current while maintaining >100dB open-loop gain at 5kΩ load.
It is unity-gain stable and optimized for driving ADC inputs (e.g., ADS7822), with 0.17V/µs slew rate and 21µs 0.1% settling time for 2V step. Input voltage noise is 60nV/√Hz at 1kHz, and input bias current remains below ±10pA across temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.3V to 5.5V single supply - enables direct use in 3V and 5V battery systems without regulation |
| Quiescent Current | 20µA typical per amplifier - extends battery life in portable equipment beyond 10 years at µA-level system sleep currents |
| Gain-Bandwidth Product | 350kHz - sufficient for sensor buffering, 2-wire transmitter loop filtering, and CO detector analog front-ends |
| Input Offset Voltage | 2mV max at +25°C - ensures <0.04% error in 50mV–5V sensor signal chains without trimming |
| Output Voltage Swing | Within 5mV of rails (RL = 100kΩ) - maximizes dynamic range in low-voltage, single-supply data acquisition |
| Input Bias Current | ±0.5pA typical - prevents leakage-induced errors in high-impedance pH or gas sensor interfaces |
| Operating Temperature | –55°C to +125°C - qualified for industrial smoke detector housings and automotive cabin air quality modules |
Pinout & Package
OPA347PAG4 is housed in an 8-pin Plastic Dual In-line Package (PDIP) with 0.3-inch body width and through-hole mounting. Thermal resistance θJA is 100°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | +In (Non-inverting Input) | High-impedance node accepting sensor signals up to (V–) – 0.2V or (V+) + 0.2V; biased by internal complementary pair |
| 2 | –In (Inverting Input) | Differential input referenced to +In; supports precision inverting configurations with <0.5pA input bias current |
| 3 | Out (Output) | Class AB rail-to-rail output capable of sourcing/sinking ±17mA; swings within 5mV of V+ or V– under light load |
| 4 | V– (Negative Supply) | Ground reference for single-supply operation; accepts 0V or negative rail; input common-mode extends 200mV below this pin |
| 5 | NC | No connect - unused pin; must remain unconnected per TI design specification |
| 6 | NC | No connect - unused pin; no internal connection; floating per datasheet |
| 7 | NC | No connect - unused pin; electrically isolated; no routing required on PCB |
| 8 | V+ (Positive Supply) | Primary power input; supports 2.3V–5.5V range; bypassing with 0.01µF ceramic capacitor required for stability |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input stage | Common-mode range extends 200mV beyond V+ and V– rails - enables full-scale signal capture in 3V systems without level-shifting |
| Ultra-low quiescent current | 20µA typical - reduces total system standby power to sub-100µW, critical for coin-cell–powered smoke alarms |
| Unity-gain stable architecture | No external compensation required - simplifies layout in space-constrained portable PCBs and eliminates stability tuning |
| High CMRR over full range | 70dB minimum (V– < VCM < V+ – 1.7V) - rejects supply ripple and EMI in noisy 2-wire transmitter loops |
| Specified for extended temperature | –55°C to +125°C operation - meets industrial and automotive ambient requirements without derating |
Applications
| Smoke Detectors | 2-Wire Transmitters |
|---|---|
Use Scenario: Amplifying ionization chamber current (pA–nA) in residential smoke alarms powered by 9V alkaline batteries. IC Role / Device Role / Timing Role: Precision transimpedance amplifier with rail-to-rail input enabling full dynamic range capture from zero to saturation. Use Value: 20µA IQ extends battery life beyond 10 years; ±0.5pA input bias avoids false triggers from leakage; 125°C rating supports enclosed plastic housing thermal profiles. | Use Scenario: Signal conditioning stage in 4–20mA loop-powered industrial pressure transmitters operating from 12–24V supply. IC Role / Device Role / Timing Role: Low-power buffer and level shifter interfacing MEMS sensor output to DAC-controlled current source. Use Value: Rail-to-rail output drives 2.5V reference nodes directly; 350kHz GBW supports 100Hz sensor bandwidth with margin; 70dB CMRR suppresses loop-induced common-mode noise. |
| Portable Gas Monitors | Battery-Powered Instrumentation |
Use Scenario: Front-end amplifier for electrochemical CO sensors in handheld air quality meters using AAA batteries. IC Role / Device Role / Timing Role: Ultra-low-noise, low-drift amplifier converting nA-level sensor current to voltage for 12-bit ADC sampling. Use Value: 60nV/√Hz input noise preserves SNR in µV-level signals; 3µV/°C offset drift minimizes calibration frequency; SC70/SOT23 variants available for miniaturized designs. | Use Scenario: Signal chain gain block in handheld multimeters and portable oscilloscope probes with 3.3V Li-ion supply. IC Role / Device Role / Timing Role: Single-supply non-inverting amplifier providing programmable gain (1–100) with minimal headroom loss. Use Value: Output swing within 5mV of rails preserves >99% of 3.3V full-scale range; 21µs settling supports 50ksps sampling; PDIP variant (OPA347PAG4) enables through-hole prototyping and serviceability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA347UA | SO-8 package, same electrical specs, MSL Level-2, 260°C reflow compatible | Suitable for surface-mount production; requires PCB redesign from through-hole to SMT | Select when automated assembly, smaller footprint, or thermal performance (θJA = 150°C/W) is prioritized over serviceability |
| OPA347SA | SC70-5 package, 5-pin, identical core specs but minimum supply 2.4V; no NC pins | Optimized for ultra-compact, lowest-cost portable designs; lacks NC pins for simplified layout | Select for space-constrained battery devices where pin count reduction and smallest footprint (2.0 × 1.25mm) outweigh through-hole service needs |
Compared with OPA347UA and OPA347SA, the OPA347PAG4 offers mechanical robustness and field-replaceability via PDIP packaging, while retaining identical micropower rail-to-rail performance - making it the preferred choice for prototyping, repairable instruments, and legacy through-hole manufacturing lines.
Availability
OPA347PAG4 is available at Aetrix Electronics and suitable for smoke detectors, 2-wire transmitters, and portable gas monitors requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for OPA347PAG4 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 series belongs to TI's micropower operational amplifier product line, designed specifically for battery-operated safety and environmental monitoring systems demanding rail-to-rail performance, ultra-low IQ, and extended temperature reliability.
FAQ
What is the maximum supply voltage rating for OPA347PAG4?
The absolute maximum supply voltage for OPA347PAG4 is 7.5V between V+ and V– pins. Exceeding this may cause permanent damage. The recommended operating range is 2.3V to 5.5V single supply, with full specifications guaranteed across that range. This allows safe integration into 5V systems with margin, while supporting 3.3V and lower battery rails without regulation.
Does OPA347PAG4 support rail-to-rail input and output simultaneously?
Yes, OPA347PAG4 supports true rail-to-rail input and output operation. Its input common-mode range extends from (V–) – 0.2V to (V+) + 0.2V, and its output can swing to within 5mV of either rail under 100kΩ load. This enables full utilization of supply voltage in single-supply configurations - critical for maximizing SNR in low-voltage sensor interfaces used in OPA347PAG4-based smoke and CO detectors.
What is the input bias current specification for OPA347PAG4 at room temperature?
The input bias current for OPA347PAG4 is ±0.5pA typical and ±10pA maximum at +25°C. This ultra-low value ensures negligible voltage error across high-impedance sources such as electrochemical gas sensors or photodiode transimpedance networks. The specification holds across the full –55°C to +125°C range, making OPA347PAG4 suitable for unregulated outdoor or automotive cabin environments.
Can OPA347PAG4 drive capacitive loads without external compensation?
OPA347PAG4 can directly drive up to 250pF of pure capacitive load in unity-gain configuration without oscillation. For larger loads or inverting configurations, a small series resistor (10–20Ω) at the output or feedback capacitor (4–6pF) improves stability. This capability simplifies anti-aliasing filter design in OPA347PAG4-based ADC driver circuits, such as those interfacing with ADS7822 in portable instrumentation.
Is OPA347PAG4 RoHS compliant and lead-free?
Yes, OPA347PAG4 is RoHS compliant and features lead-free terminations with NiPdAu plating. Per TI's Package Option Addendum, it carries "Green (RoHS & no Sb/Br)" eco plan designation and NIPDAU lead finish. The PDIP package has no moisture sensitivity level (MSL) rating, eliminating bake requirements - a practical advantage for through-hole rework and low-volume assembly of OPA347PAG4.
OPA347PAG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Discontinued at Digi-Key
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 1
- 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
- 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:
- Through Hole
- Supplier Device Package:
- 8-PDIP
OPA347PAG4 FAQ
1.How can I place an order for OPA347PAG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA347PAG4 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 OPA347PAG4 reliable?
The price and inventory of OPA347PAG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA347PAG4 is usually 5 days.
3.What payment methods are accepted for OPA347PAG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA347PAG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA347PAG4?
OPA347PAG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA347PAG4 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 OPA347PAG4?
For technical support, including OPA347PAG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA347PAG4 requirements.
6.How does Aetrix verify that OPA347PAG4 is sourced from the original manufacturer or authorized distributors?
All OPA347PAG4 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 OPA347PAG4 meets industry standards.
7.What is the process for return or replacement of OPA347PAG4?
All OPA347PAG4 units undergo pre-shipment inspection (PSI). If there is an issue with OPA347PAG4, 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 OPA347PAG4 part is unused and in its original packaging.
Return procedure for OPA347PAG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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