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Texas Instruments OPA2348AIDCNTG4
- Part No.:
- OPA2348AIDCNTG4
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SOT-23-8
- Datasheet:
-
OPA2348AIDCNTG4.pdf
- Description:
- IC CMOS 2 CIRCUIT SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:4,178
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Product details
Overview
OPA2348AIDCNTG4 from Texas Instruments is a dual-channel, rail-to-rail input/output CMOS operational amplifier optimized for low-power, single-supply operation (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 operates across –40°C to +125°C - enabling use in battery-powered smoke alarms and CO detectors where high-impedance sensor interfacing and extended temperature reliability are critical.
For engineers reviewing the OPA2348AIDCNTG4 datasheet, OPA2348AIDCNTG4 pinout, OPA2348AIDCNTG4 application, or OPA2348AIDCNTG4 equivalent, key selection criteria include its dual-channel configuration in 8-pin SOT-23 package, rail-to-rail I/O swing within 25 mV of rails, ultra-low input bias current for high-Z sensor buffering, and verified performance driving 12-bit ADCs like ADS7822 in portable safety systems.
Technical Context
The OPA2348AIDCNTG4 employs 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 rails under light load - while maintaining >94 dB open-loop gain at 5 V supply.
It is unity-gain stable and specified for capacitive loads up to 250 pF in unity-gain buffer configuration. Input offset voltage is 1–5 mV (typ/max), with drift of 4 µV/°C over –40°C to +125°C, and PSRR/CMRR exceed 60 dB across dc to 1 kHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Channels | Dual amplifier - enables compact two-signal conditioning paths (e.g., differential sensor pair or signal + reference) |
| GBW | 1 MHz - sufficient for settling 12-bit ADC inputs (e.g., ADS7822) within 5 µs for 0.1% accuracy |
| IQ per channel | 45 µA typical - allows continuous operation for >1 year on a single CR2032 coin cell in smoke alarm standby mode |
| Input bias current | 0.5 pA typical - preserves signal integrity from high-impedance sources (e.g., electrochemical CO sensors & electret mics) |
| Rail-to-rail I/O | Input extends 200 mV beyond rails; output swings to within 18 mV of V+ and V– - maximizes dynamic range on 3.3 V or 5 V single supply |
| Operating temp | –40°C to +125°C - qualified for automotive cabin, industrial enclosure, and residential fire alarm mounting environments |
| Supply voltage | 2.1 V to 5.5 V - compatible with Li-ion, alkaline, and regulated 3.3 V/5 V rails without level-shifting |
Pinout & Package
OPA2348AIDCNTG4 is housed in an 8-pin SOT-23 (DCN) package measuring 2.90 mm × 1.63 mm × 1.10 mm, optimized for space-constrained portable safety devices.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT A | Amplifier A output - drives ADC input or sensor load; rail-to-rail swing supports full-scale 0–VREF conversion |
| 2 | –IN A | Inverting input, channel A - used in transimpedance or inverting gain configurations for current-output sensors |
| 3 | +IN A | Noninverting input, channel A - connects directly to high-Z voltage sources (e.g., thermistor divider, pH probe) |
| 4 | V– | Negative supply - tied to ground in single-supply systems; establishes reference for rail-to-rail input common-mode range |
| 5 | +IN B | Noninverting input, channel B - enables independent second signal path (e.g., temperature compensation reference) |
| 6 | –IN B | Inverting input, channel B - supports differential sensing or dual-stage filtering |
| 7 | OUT B | Amplifier B output - can buffer reference voltage or drive secondary ADC channel |
| 8 | V+ | Positive supply - accepts 2.1–5.5 V; bypassing with 0.01 µF ceramic capacitor required for stability |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low input bias current | 0.5 pA typical - prevents loading errors in >1 GΩ sensor circuits (e.g., ionization chamber smoke detectors) |
| Rail-to-rail input range | Extends 200 mV beyond V+ and V– - accommodates signals near supply rails without clipping in single-supply 3.3 V systems |
| Low quiescent current | 45 µA per amplifier - reduces average system power to <100 µA in duty-cycled smoke alarm wake/sleep cycles |
| Unity-gain stability | Stable with CL ≤ 250 pF - eliminates need for external compensation when driving ADC sample-and-hold capacitance |
| Extended temperature range | –40°C to +125°C operation - ensures reliable performance in attic-mounted alarms or vehicle cabin sensors |
Applications
| Smoke Detector Signal Conditioning | CO Gas Sensor Interface |
|---|---|
Use Scenario: Amplifying weak current from ionization chamber in battery-powered residential smoke alarms. IC Role / Device Role / Timing Role: Dual-channel OPA2348AIDCNTG4 buffers and amplifies chamber current (pA–nA range) while rejecting supply noise via high PSRR. Use Value: 0.5 pA input bias current prevents signal loss across MΩ-level feedback resistors; rail-to-rail output ensures full utilization of 12-bit ADC range. | Use Scenario: Interfacing electrochemical CO sensor output (µV–mV) to ADS7822 12-bit ADC in portable gas monitor. IC Role / Device Role / Timing Role: OPA2348AIDCNTG4 channel A conditions sensor signal; channel B buffers reference voltage for ratiometric ADC measurement. Use Value: Dual amplifiers in one 8-pin SOT-23 reduce PCB area by 40% vs discrete solutions; 45 µA/channel enables multi-year battery life. |
| Portable Medical Pulse Oximetry | Industrial Temperature Monitoring |
Use Scenario: Amplifying photodiode current from red/IR LEDs in wearable pulse oximeter with CR2032 power source. IC Role / Device Role / Timing Role: OPA2348AIDCNTG4 provides transimpedance gain and DC offset removal before ADC sampling at 100 Hz. Use Value: 1 MHz GBW settles 2-V step in 5 µs (0.1%), meeting 12-bit ADC timing; rail-to-rail I/O maximizes SNR on 3.3 V supply. | Use Scenario: Conditioning output of RTD or thermistor bridge in factory-floor temperature controller operating at 85°C ambient. IC Role / Device Role / Timing Role: OPA2348AIDCNTG4 performs precision instrumentation amplification (with external resistors) and reference buffering. Use Value: –40°C to +125°C rating ensures calibration stability; 4 µV/°C offset drift minimizes temperature-induced measurement error. |
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 |
|---|---|---|---|
| MCP6022-I/SN | Higher IQ (100 µA/channel), lower GBW (10 MHz), same 8-pin SOIC package but larger footprint (4.9 × 3.9 mm) | Less suitable for ultra-low-power battery systems; better for higher-speed signal chains requiring >1 MHz bandwidth | Select MCP6022-I/SN only if higher speed or SOIC assembly compatibility outweighs 2.2× higher supply current. |
| LMV358IDR | Higher IQ (80 µA/channel), wider supply range (2.7–5.5 V), no extended temp rating (–40°C to +85°C only) | Not rated for automotive or industrial high-temp environments; lacks sub-pA input bias for ultra-high-Z sensors | Choose LMV358IDR only for cost-sensitive consumer applications where 125°C operation and pA-level bias are not required. |
Compared with MCP6022-I/SN and LMV358IDR, OPA2348AIDCNTG4 uniquely combines 45 µA/channel quiescent current, 0.5 pA input bias, and –40°C to +125°C operation in an 8-pin SOT-23 - making it the only option qualified for long-life, high-reliability safety-critical sensor interfaces.
Availability
OPA2348AIDCNTG4 is available at Aetrix Electronics and suitable for smoke detection systems, portable gas monitors, and medical wearables requiring stable component supply, extended temperature qualification, and long-term lifecycle support.
Supply support for OPA2348AIDCNTG4 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 amplifiers and sensor interface ICs.
The OPAx348 product line was designed specifically for ultra-low-power, single-supply sensor signal conditioning in safety-critical portable equipment - emphasizing rail-to-rail operation, sub-pA input bias, and extended temperature reliability.
FAQ
What is the maximum capacitive load the OPA2348AIDCNTG4 can drive in unity-gain configuration?
The OPA2348AIDCNTG4 can directly drive up to 250 pF of pure capacitive load in unity-gain buffer configuration while maintaining stability. For loads exceeding this, a small series resistor (10–20 Ω) between the output and capacitive node improves phase margin without degrading DC accuracy - a technique validated in TI's SBOS213H datasheet Figure 22. This capability is essential when driving the input capacitance of 12-bit ADCs like ADS7822.
Does the OPA2348AIDCNTG4 support true rail-to-rail input when powered from a 3.3 V supply?
Yes. The OPA2348AIDCNTG4 features a complementary N/P-channel input stage that extends the common-mode input range to (V–) – 0.2 V and (V+) + 0.2 V. At 3.3 V supply, this means inputs from –0.2 V to +3.5 V are fully linear - accommodating signals that swing near or slightly beyond the rails, such as those from electret microphones or biased thermistors. This behavior is confirmed in Section 7.3.3 of the SBOS213H datasheet.
What is the typical input offset voltage drift of the OPA2348AIDCNTG4 over temperature?
The OPA2348AIDCNTG4 has a typical input offset voltage drift of 4 µV/°C across the full operating temperature range of –40°C to +125°C. This low drift ensures minimal calibration drift in precision sensor applications like CO detectors or medical instrumentation, where measurement accuracy must be maintained across environmental extremes. The value is specified in Table 6.7 of the SBOS213H datasheet under "dVOS/dT".
Can the OPA2348AIDCNTG4 operate from a 2.1 V supply while maintaining rail-to-rail output swing?
Yes. The OPA2348AIDCNTG4 is fully specified down to 2.1 V supply voltage and maintains rail-to-rail output swing - typically within 25 mV of both rails under 100 kΩ load at 2.1 V. This enables operation from single-cell lithium or alkaline batteries without voltage boosting. The datasheet confirms functionality across the entire 2.1–5.5 V range in Section 6.3 (Recommended Operating Conditions) and Figure 6 (Output Voltage Swing vs Output Current).
Is the OPA2348AIDCNTG4 pin-compatible with other dual op amps in SOT-23 packages?
No. The OPA2348AIDCNTG4 uses a standard 8-pin SOT-23 pinout defined in TI's SBOS213H datasheet (Page 4): pins 1/7 = OUT A/B, 2/6 = –IN A/B, 3/5 = +IN A/B, 4 = V–, 8 = V+. While physically compatible with generic 8-pin SOT-23 footprints, electrical pin assignments differ from industry alternatives like LMV358 or MCP6022 - which use non-mirrored layouts. Direct replacement requires schematic and layout review.
OPA2348AIDCNTG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SOT-23-8
- Packaging:
- Tape & Reel (TR)
- 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:
- SOT-23-8
OPA2348AIDCNTG4 FAQ
1.How can I place an order for OPA2348AIDCNTG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA2348AIDCNTG4 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 OPA2348AIDCNTG4 reliable?
The price and inventory of OPA2348AIDCNTG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA2348AIDCNTG4 is usually 5 days.
3.What payment methods are accepted for OPA2348AIDCNTG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA2348AIDCNTG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA2348AIDCNTG4?
OPA2348AIDCNTG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA2348AIDCNTG4 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 OPA2348AIDCNTG4?
For technical support, including OPA2348AIDCNTG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA2348AIDCNTG4 requirements.
6.How does Aetrix verify that OPA2348AIDCNTG4 is sourced from the original manufacturer or authorized distributors?
All OPA2348AIDCNTG4 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 OPA2348AIDCNTG4 meets industry standards.
7.What is the process for return or replacement of OPA2348AIDCNTG4?
All OPA2348AIDCNTG4 units undergo pre-shipment inspection (PSI). If there is an issue with OPA2348AIDCNTG4, 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 OPA2348AIDCNTG4 part is unused and in its original packaging.
Return procedure for OPA2348AIDCNTG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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