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Texas Instruments OPA2348AIDCNT
- Part No.:
- OPA2348AIDCNT
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SOT-23-8
- Datasheet:
-
OPA2348AIDCNT.pdf
- Description:
- IC CMOS 2 CIRCUIT SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:2,329
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Product details
Overview
OPA2348AIDCNT from Texas Instruments is a dual-channel, rail-to-rail input/output CMOS operational amplifier optimized for low-power, single-supply sensor signal conditioning and ADC driver applications. 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 use in battery-powered smoke alarms, CO detectors, and portable medical instrumentation.
For engineers reviewing the OPA2348AIDCNT datasheet, OPA2348AIDCNT pinout, OPA2348AIDCNT application, or OPA2348AIDCNT equivalent, key selection criteria include its ultra-low IQ, rail-to-rail I/O swing within 25 mV of rails, extended common-mode range (V– –0.2 V to V+ +0.2 V), and validated performance driving 12-bit SAR ADCs like ADS7822 in space-constrained SOT-23-8 layouts.
Technical Context
The OPA2348AIDCNT uses a complementary N/P-channel input stage enabling rail-to-rail input operation with no phase inversion beyond supply rails when input current is limited to ≤10 mA. Its class AB output stage supports rail-to-rail output swing - typically within 18 mV of rails at light loads (100 kΩ) and 100 mV at 5 kΩ - while maintaining >90 dB open-loop gain.
It is unity-gain stable and capable of directly driving up to 250 pF capacitive loads; stability under heavier capacitive loading is enhanced by series output resistance or feedback capacitance compensation. The device is fully specified across –40°C to +125°C and 2.1 V to 5.5 V supply range, with offset voltage drift of 4 µV/°C and PSRR of 175 µV/V (typ) at 25°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Channels | Dual - enables compact two-signal paths (e.g., differential sensor pairs or dual ADC channels) without doubling board area. |
| Gain-bandwidth product | 1 MHz - sufficient for settling 12-bit ADC inputs (e.g., ADS7822) within 5 µs for 0.1% accuracy at 5.5 V supply. |
| Quiescent current per channel | 45 µA (typ) - allows continuous operation for >1 year on a single CR2032 coin cell in smoke alarm standby mode. |
| Input bias current | 0.5 pA (typ) - preserves signal integrity from high-impedance sources (e.g., electret microphones, pH electrodes). |
| Rail-to-rail input range | V– –0.2 V to V+ +0.2 V - accepts signals beyond supply rails, simplifying level-shifting in single-supply systems. |
| Output voltage swing | Within 18 mV of rails (100 kΩ load) - maximizes dynamic range into 0–VREF ADC inputs without external level translation. |
| Operating supply voltage | 2.1 V to 5.5 V - supports direct connection to Li-ion, 3.3 V logic, or 5 V legacy rails without LDO overhead. |
Pinout & Package
OPA2348AIDCNT is housed in an 8-pin SOT-23 (DCN) package measuring 2.90 mm × 1.63 mm × 1.10 mm, optimized for high-density PCB layouts in portable and safety-critical equipment.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - OUT A | Amplifier A output | Drives downstream load (e.g., ADC input); requires local 0.01 µF bypass capacitor to GND for stability. |
| 2 - –IN A | Inverting input, channel A | Accepts inverted signal path; matched impedance to +IN A minimizes common-mode error in differential configurations. |
| 3 - +IN A | Noninverting input, channel A | High-impedance node (10¹³ Ω || 3 pF); sensitive to PCB leakage - keep trace short and guard-ring routed. |
| 4 - V– | Negative supply | Ground reference for single-supply operation; must be low-impedance return path shared with ADC and bypass caps. |
| 5 - +IN B | Noninverting input, channel B | Independent high-Z input for second sensor or reference path; electrically isolated from channel A except via shared V–/V+. |
| 6 - –IN B | Inverting input, channel B | Supports dual-channel instrumentation (e.g., active filter + buffer) without cross-talk above 134 dB at DC. |
| 7 - OUT B | Amplifier B output | Provides second buffered output; layout symmetry with OUT A reduces thermal mismatch in precision applications. |
| 8 - V+ | Positive supply | Primary power entry; decouple with 0.01 µF ceramic cap placed <1 mm from pin to minimize supply-induced noise coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low quiescent current | 45 µA per amplifier enables multi-year battery life in always-on safety sensors without duty cycling. |
| Rail-to-rail input with no phase inversion | Inputs tolerate up to 0.5 V beyond supplies when current-limited - eliminates need for external clamping diodes in overvoltage-prone environments. |
| Extended temperature range | Specified from –40°C to +125°C - qualified for under-hood automotive, industrial control, and fire alarm enclosures. |
| Low input offset voltage drift | 4 µV/°C max ensures <±60 µV total drift over full temperature range - critical for uncalibrated analog front-ends. |
| Unity-gain stable with capacitive load drive | Drives 250 pF directly; supports RC anti-aliasing filters and long traces to remote ADCs without external compensation. |
Applications
| Smoke Detector Signal Conditioning | CO Gas Sensor Amplification |
|---|---|
Use Scenario: Amplifies weak ionization current (pA–nA) from smoke chamber electrodes into clean voltage for 12-bit ADC sampling. IC Role / Device Role / Timing Role: Dual-channel OPA2348AIDCNT buffers and filters two independent sensing elements while rejecting common-mode EMI. Use Value: 0.5 pA input bias current prevents signal loss across megaohm chamber resistances; rail-to-rail output ensures full ADC code utilization. | Use Scenario: Conditions electrochemical CO sensor output (low-level mV signal with high source impedance) before digitization. IC Role / Device Role / Timing Role: Channel A serves as transimpedance amplifier; Channel B provides reference voltage buffering for ratiometric ADC measurement. Use Value: 45 µA per channel enables continuous monitoring on coin-cell power; 1 MHz bandwidth supports fast gas concentration response detection. |
| Portable ECG Front-End | ADC Input Driver for ADS7822 |
Use Scenario: First-stage amplification and filtering of biopotential signals (0.5–100 Hz) in handheld diagnostic devices. IC Role / Device Role / Timing Role: Configured as low-noise, high-input-impedance noninverting amplifier with 300 Hz low-pass filtering. Use Value: 10 µVPP input-referred noise (0.1–10 Hz) preserves microvolt-level cardiac waveforms; 2.1 V minimum supply allows direct LiPo integration. | Use Scenario: Drives the analog input of TI's 12-bit ADS7822 serial ADC in battery-powered data loggers. IC Role / Device Role / Timing Role: Provides low-impedance, charge-injection-immune source for the ADC's sampling capacitor (10 pF typical). Use Value: 5 µs 0.1% settling time meets ADS7822's 100 kSPS requirement; rail-to-rail output ensures 0–VREF full-scale utilization. |
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 (180 µA/channel), lower GBW (10 MHz), same SOT-23-8 package; input bias current 1 pA (vs. 0.5 pA). | Better for higher-speed filtering but increases battery drain 4×; less suitable for multi-year coin-cell operation. | Select MCP6022-I/SN only if >1 MHz bandwidth or faster settling is required and power budget permits. |
| TLV2462IDR | Higher IQ (550 µA/channel), rail-to-rail I/O, SOIC-8 only (no SOT-23-8); offset drift 10 µV/°C (vs. 4 µV/°C). | Not suitable for ultra-low-power designs; larger footprint limits portable use; higher drift impacts uncalibrated sensors. | Choose TLV2462IDR only for legacy SOIC-8 compatibility or where higher drive strength justifies power penalty. |
Compared with MCP6022-I/SN and TLV2462IDR, OPA2348AIDCNT offers the lowest quiescent current among SOT-23-8 dual op amps with verified 12-bit ADC driver performance, making it optimal for space- and energy-constrained safety and portable instrumentation.
Availability
OPA2348AIDCNT 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 long-term lifecycle support.
Supply support for OPA2348AIDCNT 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 solutions.
The OPAx348 family was designed specifically for ultra-low-power, single-supply signal conditioning in safety-critical and battery-operated applications - emphasizing rail-to-rail operation, sub-100 nA input bias, and extended temperature reliability.
FAQ
What is the maximum capacitive load the OPA2348AIDCNT can drive in unity-gain configuration?
The OPA2348AIDCNT can directly drive up to 250 pF of pure capacitive load while maintaining stability in unity-gain 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 OPA2348AIDCNT suitable for driving ADC input capacitors and long PCB traces in compact sensor modules.
Does the OPA2348AIDCNT support true rail-to-rail input operation beyond the supply rails?
Yes - the OPA2348AIDCNT 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. Inputs may safely exceed supply rails by up to 0.5 V provided input current is limited to ≤10 mA (e.g., using a series resistor), with no phase inversion or latch-up. This behavior is explicitly confirmed in Section 7.3.3 of the SBOS213H datasheet and enables simplified interfacing with overvoltage-tolerant sensors without external protection diodes.
What is the guaranteed operating temperature range for the OPA2348AIDCNT?
The OPA2348AIDCNT is fully specified and tested across –40°C to +125°C ambient temperature, with all electrical parameters (including offset voltage, GBW, and IQ) guaranteed over this range at supply voltages from 2.1 V to 5.5 V. This extended qualification supports deployment in harsh environments such as automotive engine compartments, industrial control cabinets, and fire alarm housings - a key differentiator versus commercial-grade op amps rated only to +85°C.
Can the OPA2348AIDCNT be used to drive the ADS7822 12-bit ADC?
Yes - the OPA2348AIDCNT is explicitly referenced in TI's application circuit for the ADS7822 (see datasheet page 16, Figure 24), where it conditions electret microphone signals prior to ADC conversion. Its 1 MHz bandwidth, 5 µs 0.1% settling time, rail-to-rail output swing, and low output impedance ensure accurate charging of the ADS7822's internal sampling capacitor without missing codes or distortion - making OPA2348AIDCNT a proven, production-ready ADC driver.
What package type is used for the OPA2348AIDCNT and what are its key mechanical dimensions?
The OPA2348AIDCNT uses the 8-pin SOT-23 (DCN) package, with nominal body dimensions of 2.90 mm × 1.63 mm × 1.10 mm and lead pitch of 0.65 mm. This micro-size footprint enables high-density placement in portable and safety-critical equipment where board space is constrained - such as smoke alarm PCBs and wearable medical sensors - while maintaining standard reflow compatibility and hand-solderability.
OPA2348AIDCNT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SOT-23-8
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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
OPA2348AIDCNT FAQ
1.How can I place an order for OPA2348AIDCNT through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA2348AIDCNT 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 OPA2348AIDCNT reliable?
The price and inventory of OPA2348AIDCNT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA2348AIDCNT is usually 5 days.
3.What payment methods are accepted for OPA2348AIDCNT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA2348AIDCNT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA2348AIDCNT?
OPA2348AIDCNT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA2348AIDCNT 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 OPA2348AIDCNT?
For technical support, including OPA2348AIDCNT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA2348AIDCNT requirements.
6.How does Aetrix verify that OPA2348AIDCNT is sourced from the original manufacturer or authorized distributors?
All OPA2348AIDCNT 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 OPA2348AIDCNT meets industry standards.
7.What is the process for return or replacement of OPA2348AIDCNT?
All OPA2348AIDCNT units undergo pre-shipment inspection (PSI). If there is an issue with OPA2348AIDCNT, 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 OPA2348AIDCNT part is unused and in its original packaging.
Return procedure for OPA2348AIDCNT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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