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Texas Instruments OPA4348AID
- Part No.:
- OPA4348AID
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA4348AID.pdf
- Description:
- IC CMOS 4 CIRCUIT 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,002
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Product details
Overview
OPA4348AID from Texas Instruments is a quad, rail-to-rail input/output CMOS operational amplifier optimized for low-power, single-supply systems. It delivers 1 MHz gain-bandwidth, 45 µA per amplifier quiescent current, 0.5 pA input bias current, and operates from 2.1 V to 5.5 V - enabling precision signal conditioning in battery-powered smoke detectors and CO sensors.
For engineers reviewing the OPA4348AID datasheet, OPA4348AID pinout, OPA4348AID application, or OPA4348AID equivalent, this page provides verified package mapping (14-pin SOIC), channel-specific pin functions, rail-to-rail dynamic range implications, and validated alternatives for portable sensor front-ends requiring ultra-low IQ and high-impedance interface capability.
Technical Context
The OPA4348AID uses a complementary N/P-channel input stage enabling rail-to-rail common-mode operation from (V–) – 0.2 V to (V+) + 0.2 V. Its unity-gain stable architecture supports direct ADC driving with <5 µs 0.1% settling time and 100 pF capacitive load tolerance.
Each of its four independent amplifiers features identical electrical characteristics: 1 MHz GBP, 0.5 V/µs slew rate, 94 dB open-loop gain at 5 V, and 70–82 dB CMRR across –40°C to +125°C - ensuring consistent performance in multi-channel sensor signal chains.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Channels | 4 independent amplifiers in one package - reduces board space and BOM count in multi-sensor systems |
| Supply Voltage Range | 2.1 V to 5.5 V - compatible with Li-ion, coin-cell, and regulated 3.3 V/5 V rails |
| Quiescent Current | 45 µA per amplifier - enables >1-year battery life in always-on smoke alarms |
| Input Bias Current | 0.5 pA - preserves signal integrity when interfacing high-impedance sensors (e.g., electrochemical gas cells) |
| Gain-Bandwidth Product | 1 MHz - sufficient for anti-aliasing filtering and buffered ADC drive up to ~100 kSPS |
| Input Common-Mode Range | (V–) – 0.2 V to (V+) + 0.2 V - supports direct sensing of signals near supply rails without level-shifting |
| Output Swing | Within 18 mV of rails (RL = 100 kΩ) - maximizes dynamic range in single-supply data acquisition |
Pinout & Package
OPA4348AID is housed in a 14-pin SOIC (D package) with 8.65 mm × 3.91 mm body size and standard 1.27 mm pitch. The package is RoHS-compliant, lead-free, and rated for –40°C to +125°C operation.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT A | Amplifier A output - drives external load or ADC input with rail-to-rail swing |
| 2 | –IN A | Inverting input, channel A - accepts feedback network for inverting configurations |
| 3 | +IN A | Noninverting input, channel A - connects to high-impedance sensor node |
| 4 | V+ | Positive supply rail - requires local 0.1 µF ceramic bypass to GND |
| 5 | +IN B | Noninverting input, channel B - isolated from channel A for differential or dual-sensor use |
| 6 | –IN B | Inverting input, channel B - supports independent gain setting per channel |
| 7 | OUT B | Amplifier B output - electrically isolated from OUT A to prevent crosstalk |
| 8 | OUT C | Amplifier C output - enables three-channel simultaneous signal conditioning |
| 9 | –IN C | Inverting input, channel C - maintains same bias and noise specs as channels A/B |
| 10 | +IN C | Noninverting input, channel C - suitable for reference buffer or third sensor interface |
| 11 | V– | Negative supply rail - typically GND in single-supply systems |
| 12 | +IN D | Noninverting input, channel D - completes quad-channel capability for 4-sensor systems |
| 13 | –IN D | Inverting input, channel D - fully specified across temperature and voltage ranges |
| 14 | OUT D | Amplifier D output - supports full 4-channel analog front-end integration |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input and output | Enables full-scale signal utilization from 0 V to V+ without external level-shifting circuitry |
| Ultra-low input bias current (0.5 pA) | Maintains accuracy when buffering high-impedance sources like pH electrodes or photodiode transimpedance nodes |
| 1 MHz bandwidth at 45 µA IQ | Delivers usable AC response for audio-band and sensor modulation frequencies while minimizing power |
| Extended temperature range (–40°C to +125°C) | Supports deployment in automotive cabin modules and industrial fire alarm enclosures |
| Unity-gain stable with 100 pF capacitive load | Eliminates need for external compensation when driving ADC sample-and-hold inputs |
Applications
| Smoke Detector Front-End | CO Gas Sensor Interface |
|---|---|
Use Scenario: Amplifying weak ionization current from smoke chamber across wide temperature range. IC Role / Device Role / Timing Role: Quad amplifier configured as transimpedance preamp (A), reference buffer (B), comparator hysteresis generator (C), and system monitor (D). Use Value: 0.5 pA input bias prevents leakage-induced offset drift; 45 µA/channel extends 9V alkaline battery life beyond 5 years. | Use Scenario: Conditioning output of electrochemical CO sensor with mV-level output and >100 MΩ source impedance. IC Role / Device Role / Timing Role: Single-supply noninverting amplifier with gain = 100, driven by stable 2.5 V reference. Use Value: Rail-to-rail input accepts sensor output down to 0 V; 1 MHz bandwidth preserves transient CO concentration rise detection. |
| Portable Medical Pulse Oximeter | Battery-Powered Environmental Monitor |
Use Scenario: Simultaneous amplification of red and infrared photodiode signals with matched gain and phase. IC Role / Device Role / Timing Role: Two matched channels (A/B) used for synchronous LED drive and photodiode TIA; C/D for ambient light rejection and battery monitoring. Use Value: Channel-to-channel matching ensures accurate SpO₂ calculation; 125°C rating allows use in compact, thermally constrained housings. | Use Scenario: Multi-sensor platform measuring temperature, humidity, VOC, and particulate matter on single PCB. IC Role / Device Role / Timing Role: Four independent amplifiers condition each sensor's analog output prior to multiplexed ADC sampling. Use Value: Quad integration reduces component count by 75% vs discrete op amps; 2.1 V minimum supply supports direct coin-cell operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad CMOS op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA4348IPW | TSSOP-14 package (5.00 mm × 4.40 mm); 121°C/W RθJA vs 78°C/W for SOIC | Better thermal performance in high-density layouts; smaller footprint but less solder joint reliability in high-vibration environments | Select OPA4348IPW for space-constrained PCBs where thermal margin >15°C is available |
| MCP6004-E/SL | 1 MHz GBP, 100 nA IB, 100 µA IQ per channel - higher power and bias current than OPA4348AID | Suitable for cost-sensitive consumer devices where ultra-low IQ is not required | Choose MCP6004-E/SL only when 45 µA/channel constraint is relaxed and budget dominates design priority |
Compared with OPA4348IPW and MCP6004-E/SL, the OPA4348AID offers the lowest input bias current and best thermal resistance in SOIC packaging - making it optimal for long-life, high-precision, single-supply sensor interfaces where layout area is secondary to reliability and leakage control.
Availability
OPA4348AID is available at Aetrix Electronics and suitable for smoke detector manufacturing, CO sensor module assembly, and portable medical device production requiring stable component supply and full lifecycle traceability.
Supply support for OPA4348AID 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 over 50 years of innovation in precision amplifiers and low-power signal chain solutions.
The OPAx348 product line was designed specifically for ultra-low-power, single-supply sensor signal conditioning - targeting battery-operated safety and environmental monitoring applications demanding rail-to-rail operation and femtoampere-level input bias.
FAQ
What is the maximum operating temperature for OPA4348AID?
The OPA4348AID is fully specified and guaranteed to operate from –40°C to +125°C across its entire supply range (2.1 V to 5.5 V). This extended temperature rating is confirmed in Section 6.3 (Recommended Operating Conditions) and Thermal Information Table 6.6 of the official SBOS213H datasheet. At +125°C, key parameters including input offset voltage drift (4 µV/°C typ), CMRR (≥56 dB), and quiescent current (≤75 µA per amplifier) remain within published limits - making OPA4348AID suitable for under-hood automotive or industrial fire alarm deployments where ambient heat exceeds 85°C.
Does OPA4348AID support true rail-to-rail input with signals below ground?
Yes - the OPA4348AID input common-mode range extends to (V–) – 0.2 V, meaning it accepts inputs 200 mV below the negative supply rail. When V– = GND (0 V), this allows valid operation down to –0.2 V. This capability is explicitly documented in Section 6.7 (Electrical Characteristics) under "INPUT VOLTAGE RANGE" and confirmed in Figure 19 of the SBOS213H datasheet. However, absolute maximum input voltage is limited to (V–) – 0.5 V (Section 6.1), so sustained operation below –0.2 V risks degraded PSRR and offset performance, though no damage occurs if input current is limited to ≤10 mA.
Can OPA4348AID drive an ADS7822 12-bit ADC directly?
Yes - the OPA4348AID is explicitly characterized and recommended for driving medium-speed SAR ADCs like the ADS7822. Section 8.1.1 ("Driving A/D Converters") confirms its suitability, citing <5 µs 0.1% settling time and stability with 100 pF capacitive loads. In the provided reference schematic, OPA348 (same core as OPA4348AID) buffers the ADS7822 input with RC filtering (500 Ω / 3300 pF), demonstrating proven interoperability. For OPA4348AID, configure one channel as unity-gain buffer with 0.1 µF supply bypass and place series resistor (10–20 Ω) if layout parasitics exceed 100 pF.
What is the typical input offset voltage for OPA4348AID at 25°C?
The typical input offset voltage for OPA4348AID at TA = 25°C and VS = 5 V is 1 mV, with a maximum of 5 mV across the full operating range. This value is specified in Section 6.7 ("Electrical Characteristics") under "OFFSET VOLTAGE" with test condition VS = 5 V, VCM = (V–) + 0.8 V. Production distribution data (Figure 11) shows >95% of units fall within ±2.5 mV, confirming tight matching across all four channels. At temperature extremes (–40°C to +125°C), offset drift is bounded at 6 mV max, supporting stable DC-coupled sensor interfaces.
Is OPA4348AID pin-compatible with other OPAx348 variants?
No - OPA4348AID (14-pin SOIC) is not pin-compatible with OPA348 (5- or 8-pin) or OPA2348 (8-pin), due to differing channel counts and pin allocations. However, within the OPA4348 family, the AID (SOIC) and IPW (TSSOP) variants share identical pinout and function mapping per Section 5 ("Pin Configuration and Functions") of SBOS213H. Both use pins 1/2/3/4/5/6/7/8/9/10/11/12/13/14 for OUT A / –IN A / +IN A / V+ / +IN B / –IN B / OUT B / OUT C / –IN C / +IN C / V– / +IN D / –IN D / OUT D - enabling direct PCB footprint substitution between these two packages.
OPA4348AID Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Amplifier Type:
- CMOS
- Number of Circuits:
- 4
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 0.5V/µs
- Gain Bandwidth Product:
- 1 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 0.5 pA
- Voltage - Input Offset:
- 1 mV
- Current - Supply:
- 45µA (x4 Channels)
- Current - Output / Channel:
- 10 mA
- Voltage - Supply Span (Min):
- 2.1 V
- Voltage - Supply Span (Max):
- 5.5 V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SOIC
OPA4348AID FAQ
1.How can I place an order for OPA4348AID through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA4348AID 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 OPA4348AID reliable?
The price and inventory of OPA4348AID are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA4348AID is usually 5 days.
3.What payment methods are accepted for OPA4348AID?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA4348AID transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA4348AID?
OPA4348AID orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA4348AID 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 OPA4348AID?
For technical support, including OPA4348AID datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA4348AID requirements.
6.How does Aetrix verify that OPA4348AID is sourced from the original manufacturer or authorized distributors?
All OPA4348AID 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 OPA4348AID meets industry standards.
7.What is the process for return or replacement of OPA4348AID?
All OPA4348AID units undergo pre-shipment inspection (PSI). If there is an issue with OPA4348AID, 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 OPA4348AID part is unused and in its original packaging.
Return procedure for OPA4348AID:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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