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Texas Instruments OPA2348AIDG4
- Part No.:
- OPA2348AIDG4
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA2348AIDG4.pdf
- Description:
- IC CMOS 2 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:484
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Product details
Overview
OPA2348AIDG4 from Texas Instruments is a dual-channel, rail-to-rail input/output CMOS operational amplifier optimized for low-power, single-supply operation across 2.1 V to 5.5 V. It delivers 1 MHz gain-bandwidth, 45 µA per amplifier quiescent current, 0.5 pA input bias current, and output swing within 18 mV of rails under light load - enabling precision signal conditioning in battery-powered smoke alarms and CO detectors.
For engineers reviewing the OPA2348AIDG4 datasheet, OPA2348AIDG4 pinout, OPA2348AIDG4 application, or OPA2348AIDG4 equivalent, key selection criteria include its dual-channel SOIC-8 package, rail-to-rail I/O performance at sub-50 µA supply current, extended –40°C to +125°C temperature range, and suitability as an ADC input driver or high-impedance sensor interface in space-constrained industrial and portable systems.
Technical Context
The OPA2348AIDG4 implements a complementary N/P-channel input stage enabling rail-to-rail common-mode input range from (V–) – 0.2 V to (V+) + 0.2 V. Its class AB output stage supports rail-to-rail output swing - typically within 18 mV of supply rails with 100 kΩ load and >94 dB open-loop gain.
It is unity-gain stable and specified for capacitive load drive up to 250 pF in unity-gain buffer configuration. Input offset voltage is 1–5 mV (typ/max), drift is 4 µV/°C, and PSRR/CMRR exceed 60 dB over DC to 1 kHz - supporting accurate DC-coupled sensing in noisy single-supply environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Channels | Dual - enables independent signal paths for differential sensing or multi-sensor interfaces without board-level duplication. |
| Supply Voltage Range | 2.1 V to 5.5 V - supports direct operation from Li-ion, 3.3 V, or 5 V rails without LDOs in portable equipment. |
| Quiescent Current | 45 µA per amplifier - allows continuous operation for years on coin-cell batteries in smoke/CO detectors. |
| Input Bias Current | ±0.5 pA - preserves signal integrity when interfacing with high-impedance sources like pH electrodes or piezoresistive sensors. |
| Gain-Bandwidth Product | 1 MHz - sufficient for anti-aliasing filtering and driving 12-bit ADCs such as ADS7822 with <5 µs settling time. |
| Output Swing (RL = 100 kΩ) | Within 18 mV of rails - maximizes dynamic range in single-supply data acquisition with 0–VREF input compliance. |
| Operating Temperature | –40°C to +125°C - qualified for under-hood automotive, industrial control, and harsh-environment monitoring. |
Pinout & Package
OPA2348AIDG4 is housed in an 8-pin SOIC (D) package measuring 4.90 mm × 3.91 mm, with exposed pad not present and RoHS-compliant lead finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT A | Amplifier A output - drives downstream ADC input or filter network; requires local 0.01 µF bypass to GND. |
| 2 | –IN A | Inverting input, channel A - connects to feedback network or sensor reference point in inverting configurations. |
| 3 | +IN A | Noninverting input, channel A - accepts high-impedance sensor signals; must remain within (V–) – 0.2 V to (V+) + 0.2 V. |
| 4 | V– | Negative supply terminal - tied to system GND in single-supply use; serves as current return path for both amplifiers. |
| 5 | V+ | Positive supply terminal - accepts 2.1–5.5 V; requires dedicated 0.1 µF ceramic decoupling capacitor adjacent to pin. |
| 6 | –IN B | Inverting input, channel B - electrically isolated from channel A; supports dual-sensor or differential pair implementation. |
| 7 | OUT B | Amplifier B output - independently buffers second signal path; shares no internal nodes with OUT A. |
| 8 | +IN B | Noninverting input, channel B - identical electrical characteristics to +IN A; enables matched dual-channel front-end design. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input | Common-mode range extends 200 mV beyond supply rails - eliminates level-shifting circuitry for sensors operating near V+ or GND. |
| Ultra-low input bias current | 0.5 pA typical - prevents loading errors in megohm-range sensor interfaces (e.g., electrochemical gas sensors). |
| Low quiescent power | 45 µA per amplifier - reduces thermal drift and enables always-on monitoring in safety-critical applications. |
| Unity-gain stability | Stable with gain ≥ 1 - simplifies design of buffers, active filters, and ADC drivers without external compensation. |
| Extended temperature range | –40°C to +125°C operation - ensures parametric performance retention in automotive cabin or industrial enclosure environments. |
Applications
| Smoke Detector Front-End | Portable Gas Sensor Interface |
|---|---|
Use Scenario: Amplifying weak ionization current from smoke chamber into clean, rail-to-rail voltage for 12-bit ADC sampling. IC Role / Device Role / Timing Role: Dual-channel transimpedance amplifier and buffer - channel A conditions chamber signal, channel B monitors reference baseline. Use Value: 0.5 pA input bias minimizes offset drift over 10-year product lifetime; 45 µA per channel enables >5-year battery life on CR123A cells. | Use Scenario: Conditioning analog output from electrochemical CO sensor with high source impedance (>100 MΩ) and microamp-level output. IC Role / Device Role / Timing Role: High-impedance noninverting amplifier with rail-to-rail output - preserves full sensor dynamic range into 3.3 V ADC reference. Use Value: Rail-to-rail input accepts sensor zero-point near GND; 1 MHz bandwidth supports fast response to gas concentration changes. |
| Medical Pulse Oximetry Analog Front-End | Industrial RTD Signal Conditioning |
Use Scenario: Amplifying red/IR photodiode currents in wearable pulse oximeter, rejecting ambient light via synchronous detection. IC Role / Device Role / Timing Role: Dual-channel instrumentation-grade buffer - isolates photodiode TIA outputs before multiplexing into shared ADC. Use Value: Matched dual channels ensure consistent gain/phase between red and IR paths; 4 µV/°C offset drift maintains SpO₂ accuracy across body temperature range. | Use Scenario: Amplifying low-level voltage from 3-wire Pt100 RTD bridge in programmable logic controller I/O module. IC Role / Device Role / Timing Role: Precision gain stage with rail-to-rail output - scales 0–100 mV RTD signal to 0–3.3 V ADC input range. Use Value: 1–5 mV input offset is trimmed out in calibration; 125°C rating supports operation in hot industrial cabinets without derating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel, low-power op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA2333AIDR | Zero-drift architecture; 0.02 µV/°C offset drift vs. 4 µV/°C; higher IQ (17 µA per amp); same SOIC-8 package. | Better DC accuracy for long-term sensor drift compensation; less suitable for ultra-low-power wake-on-event designs. | Select OPA2333AIDR when offset drift dominates error budget; choose OPA2348AIDG4 when sub-50 µA total supply current is mandatory. |
| MCP6022-I/SN | Higher IQ (100 µA per amp); wider supply range (2.7–6.0 V); lower GBW (10 MHz); same SOIC-8 footprint. | Supports faster signal chains but increases battery load; less optimal for decade-long battery life requirements. | Select MCP6022-I/SN when higher speed or wider supply margin is needed; retain OPA2348AIDG4 for strict energy-constrained deployments. |
Compared with OPA2333AIDR and MCP6022-I/SN, OPA2348AIDG4 uniquely balances ultra-low quiescent current (45 µA), rail-to-rail I/O, and 1 MHz bandwidth in a standard SOIC-8 - making it the preferred choice for cost-sensitive, battery-operated safety devices where runtime and simplicity outweigh extreme DC precision or speed.
Availability
OPA2348AIDG4 is available at Aetrix Electronics and suitable for smoke detector manufacturing, portable gas sensor integration, and medical wearable development requiring stable component supply and long-lifecycle support.
Supply support for OPA2348AIDG4 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 company headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and personal electronics markets.
The OPAx348 series was designed specifically for ultra-low-power, single-supply signal conditioning in safety-critical portable equipment - emphasizing rail-to-rail operation, nanoampere input bias, and extended temperature reliability.
FAQ
What is the maximum capacitive load the OPA2348AIDG4 can drive in unity-gain configuration?
The OPA2348AIDG4 can directly drive up to 250 pF of pure capacitive load while maintaining stability in unity-gain buffer configuration. For loads exceeding this value, a small series resistor (10–20 Ω) between the output and capacitive node restores phase margin without degrading DC accuracy - a technique validated in TI's SBOS213H datasheet Figure 22. This capability makes OPA2348AIDG4 suitable for driving ADC input capacitance and PCB trace capacitance in compact layouts.
Does the OPA2348AIDG4 support true rail-to-rail input when powered from a 2.1 V supply?
Yes, the OPA2348AIDG4 maintains rail-to-rail input operation down to 2.1 V supply - its common-mode input range extends from (V–) – 0.2 V to (V+) + 0.2 V across the full 2.1–5.5 V range. At 2.1 V, this means inputs can be accepted from –0.2 V to +2.3 V. This behavior is confirmed in Section 6.3 (Recommended Operating Conditions) and Figure 19 of the SBOS213H datasheet, enabling direct interfacing with low-voltage sensors without external level shifting.
Can both amplifiers in the OPA2348AIDG4 operate independently with different gain configurations?
Yes, the two amplifiers in OPA2348AIDG4 are fully independent - each has separate input and output pins with no shared internal nodes. Channel A (pins 1, 2, 3, 4, 5) and Channel B (pins 5, 6, 7, 8, 4) share only V+ and V– supply connections. This allows simultaneous use in distinct signal paths - for example, one configured as a transimpedance amplifier for a photodiode and the other as a noninverting buffer for a thermistor - without crosstalk or interaction.
What is the typical input offset voltage drift of the OPA2348AIDG4 over temperature?
The typical input offset voltage drift of the OPA2348AIDG4 is 4 µV/°C across the full –40°C to +125°C operating range, as specified in Section 6.7 (Electrical Characteristics) of the SBOS213H datasheet. This low drift - combined with initial offset of 1–5 mV - ensures minimal calibration burden in systems requiring stable DC gain over wide ambient temperatures, such as industrial sensor transmitters or battery-powered environmental monitors using OPA2348AIDG4.
Is the OPA2348AIDG4 pin-compatible with other members of the OPAx348 family?
No, the OPA2348AIDG4 is not pin-compatible with OPA348 (5-pin SC70/SOT-23) or OPA4348 (14-pin TSSOP/SOIC). However, within the dual-channel variants, OPA2348AIDG4 (SOIC-8) shares identical pinout with OPA2348AIDR (tape-and-reel SOIC-8) and OPA2348AIDCNR (SOT-23-8), though package dimensions differ. Pin compatibility is explicitly confirmed in Section 5 (Pin Configuration and Functions) of SBOS213H, where all OPA2348 packages map –IN A, +IN A, OUT A, V–, V+, –IN B, OUT B, +IN B to pins 2, 3, 1, 4, 5, 6, 7, 8 respectively.
OPA2348AIDG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Discontinued at Digi-Key
- Amplifier Type:
- CMOS
- Number of Circuits:
- 2
- 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 (x2 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:
- 8-SOIC
OPA2348AIDG4 FAQ
1.How can I place an order for OPA2348AIDG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA2348AIDG4 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 OPA2348AIDG4 reliable?
The price and inventory of OPA2348AIDG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA2348AIDG4 is usually 5 days.
3.What payment methods are accepted for OPA2348AIDG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA2348AIDG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA2348AIDG4?
OPA2348AIDG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA2348AIDG4 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 OPA2348AIDG4?
For technical support, including OPA2348AIDG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA2348AIDG4 requirements.
6.How does Aetrix verify that OPA2348AIDG4 is sourced from the original manufacturer or authorized distributors?
All OPA2348AIDG4 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 OPA2348AIDG4 meets industry standards.
7.What is the process for return or replacement of OPA2348AIDG4?
All OPA2348AIDG4 units undergo pre-shipment inspection (PSI). If there is an issue with OPA2348AIDG4, 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 OPA2348AIDG4 part is unused and in its original packaging.
Return procedure for OPA2348AIDG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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