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Texas Instruments OPA348AIDCKTG4
- Part No.:
- OPA348AIDCKTG4
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
OPA348AIDCKTG4.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT SC70-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,450
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Product details
Overview
OPA348AIDCKTG4 from Texas Instruments is a single-channel, rail-to-rail input/output CMOS operational amplifier optimized for low-power, single-supply systems. It delivers 1 MHz gain-bandwidth, 45 µA 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 alarms and CO detectors.
For engineers reviewing the OPA348AIDCKTG4 datasheet, OPA348AIDCKTG4 pinout, OPA348AIDCKTG4 application, or OPA348AIDCKTG4 equivalent, key selection criteria include its extended common-mode range (V– – 0.2 V to V+ + 0.2 V), 18 mV output swing from rail (RL = 100 kΩ), and SC70-5 package compatibility with space-constrained sensor front-ends.
Technical Context
The OPA348AIDCKTG4 uses a complementary N/P-channel input stage enabling rail-to-rail input operation across –40°C to +125°C, with common-mode voltage tolerance extending 200 mV beyond supply rails. Its unity-gain stable architecture supports direct driving of ADC input capacitance up to 250 pF without external compensation.
It features a class-AB output stage delivering rail-to-rail output swing, maintaining >94 dB open-loop gain at 100 kΩ load while sinking/sourcing ±10 mA short-circuit current. Input offset voltage is specified at 1–5 mV (typ/max) with 4 µV/°C drift over temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-bandwidth product | 1 MHz - enables stable unity-gain buffering of audio-band and sensor signals up to ~100 kHz with minimal phase lag. |
| Quiescent current | 45 µA (typ) - allows continuous operation for years on coin-cell batteries in portable safety devices. |
| Input bias current | 0.5 pA (typ) - preserves signal integrity in high-impedance sensor interfaces (e.g., electret mics, gas sensors). |
| Input common-mode range | V– – 0.2 V to V+ + 0.2 V - supports direct sensing of signals near supply rails without level-shifting circuitry. |
| Output voltage swing | Within 18 mV of rails (RL = 100 kΩ) - maximizes dynamic range in 3.3 V or 5 V single-supply data acquisition systems. |
| Supply voltage range | 2.1 V to 5.5 V - ensures compatibility with Li-ion, alkaline, and regulated 3.3 V/5 V rails across industrial and consumer designs. |
| Operating temperature | –40°C to +125°C - qualified for under-hood automotive, industrial control, and harsh-environment safety equipment. |
Pinout & Package
The OPA348AIDCKTG4 is housed in a 5-pin SC70 (DCK) package measuring 2.00 mm × 1.25 mm, optimized for ultra-compact PCB layouts in portable and wearable electronics.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Output | Amplified signal output; capable of sourcing/sinking ±10 mA and driving ≥100 kΩ loads to within 18 mV of supply rails. |
| 2 | Inverting input (–IN) | Differential input node; accepts signals from V– – 0.2 V to V+ + 0.2 V with 0.5 pA bias current. |
| 3 | Non-inverting input (+IN) | Differential input node; identical voltage range and bias current as –IN; used for unity-gain buffer or non-inverting gain configurations. |
| 4 | Negative supply (V–) | Ground or lowest potential rail; must be bypassed with 0.01 µF ceramic capacitor close to pin. |
| 5 | Positive supply (V+) | Highest supply rail (2.1–5.5 V); requires local 0.01 µF ceramic decoupling for stability. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input and output | Enables full-scale signal utilization in single-supply systems without external level-shifting components. |
| Ultra-low input bias current (0.5 pA) | Maintains accuracy in high-Z sensor interfaces (e.g., pH electrodes, photodiode transimpedance stages). |
| 1 MHz bandwidth at 45 µA IQ | Delivers usable AC response for audio, medical, and industrial sensor signals while minimizing power consumption. |
| Extended temperature range (–40°C to +125°C) | Supports deployment in automotive cabin modules, industrial PLC I/O, and fire alarm control panels. |
| SC70-5 micro package | Reduces board area by >50% vs SOIC-8, critical for wearables and miniaturized safety devices. |
Applications
| Smoke Detector Front-End | CO Gas Sensor Amplifier |
|---|---|
Use Scenario: Amplifying weak ionization chamber current in residential smoke alarms powered by 9 V alkaline batteries. IC Role / Device Role / Timing Role: Transimpedance amplifier converting pA-level chamber current into measurable voltage for ADC sampling. Use Value: 0.5 pA input bias current prevents signal loss; 45 µA quiescent current extends battery life to >5 years in standby mode. | Use Scenario: Conditioning electrochemical CO sensor output in portable personal safety monitors. IC Role / Device Role / Timing Role: Low-drift, rail-to-rail buffer isolating sensor from ADC input capacitance during sampling. Use Value: 1 MHz bandwidth settles within 5 µs (0.1%) after step inputs, ensuring accurate 12-bit ADC conversion at 100 kSPS. |
| Portable Medical Pulse Oximeter | Industrial Temperature Transmitter |
Use Scenario: Amplifying photodiode current from red/IR LEDs in battery-operated pulse oximeters. IC Role / Device Role / Timing Role: Precision DC-coupled amplifier with rail-to-rail output driving SAR ADC reference input. Use Value: Output swing within 18 mV of rails preserves >99% of 3.3 V ADC full-scale range, improving SpO₂ measurement resolution. | Use Scenario: Signal conditioning for 4–20 mA loop-powered RTD or thermocouple transmitters in factory automation. IC Role / Device Role / Timing Role: Low-power instrumentation amplifier front-end operating from 3.3 V supply with ESD-hardened inputs. Use Value: ±2000 V HBM ESD rating and –40°C to +125°C operation ensure reliability in uncontrolled industrial environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA348AIDBVR | Same electrical specs; packaged in 5-pin SOT-23 (2.90 mm × 1.60 mm) instead of SC70-5. | Slightly larger footprint; better thermal dissipation (RθJA = 229°C/W vs 267°C/W) but less space-efficient. | Select when board layout allows marginally larger package and thermal performance is prioritized over miniaturization. |
| MCP6001T-E/OT | Lower bandwidth (1 MHz same), higher IQ (100 µA), wider supply range (1.8–6.0 V), but only 100 mV output swing from rail (RL = 6 kΩ). | Not suitable for rail-to-rail output-critical applications; lacks extended common-mode range beyond rails. | Choose only if supply voltage <2.1 V is required and output swing margin >100 mV is acceptable. |
Compared with OPA348AIDCKTG4, the OPA348AIDBVR offers identical performance in a slightly larger SOT-23 package with improved thermal resistance, while the MCP6001T-E/OT trades rail-to-rail output and ultra-low bias current for lower minimum supply voltage - making the OPA348AIDCKTG4 uniquely suited for space-constrained, high-precision, ultra-low-power sensor interfaces.
Availability
OPA348AIDCKTG4 is available at Aetrix Electronics and suitable for smoke detection systems, portable gas monitors, medical wearables, and industrial temperature transmitters requiring stable component supply across long-lifecycle deployments.
Supply support for OPA348AIDCKTG4 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 low-power signal chain solutions.
The OPA348 series belongs to TI's precision CMOS op amp portfolio, designed specifically for ultra-low-power, single-supply sensor signal conditioning in safety-critical and battery-operated applications.
FAQ
What is the maximum capacitive load the OPA348AIDCKTG4 can drive in unity-gain configuration?
The OPA348AIDCKTG4 can directly drive up to 250 pF of pure capacitive load in unity-gain configuration while maintaining stability. For loads exceeding this value, a small series resistor (10–20 Ω) between the output and capacitive load improves phase margin without degrading DC accuracy - a technique validated in TI's SBOS213H datasheet Figure 22. This capability makes the OPA348AIDCKTG4 well-suited for driving ADC input capacitance in systems like ADS7822-based data loggers.
Does the OPA348AIDCKTG4 support input voltages beyond the supply rails?
Yes - the OPA348AIDCKTG4 features a rail-to-rail input stage that operates linearly from V– – 0.2 V to V+ + 0.2 V. Inputs may extend up to 0.5 V beyond the rails without damage, provided input current is limited to ≤10 mA using a series resistor (as shown in Figure 21 of SBOS213H). This behavior avoids phase inversion and enables robust interfacing with overvoltage-prone sensors. The OPA348AIDCKTG4 maintains functionality even when inputs exceed supplies, unlike many legacy op amps.
What is the typical output voltage swing of the OPA348AIDCKTG4 at 3.3 V supply?
At a 3.3 V supply with a 100 kΩ load to V+/2, the OPA348AIDCKTG4 delivers an output voltage swing within 18 mV of each rail - i.e., from ~18 mV to ~3.282 V. This rail-to-rail performance is confirmed across –40°C to +125°C and enables full utilization of 12-bit ADCs like the ADS7822 without signal clipping. The OPA348AIDCKTG4 achieves this while consuming only 45 µA, making it ideal for low-voltage portable instrumentation.
How does the OPA348AIDCKTG4 handle ESD events in end-equipment?
The OPA348AIDCKTG4 is rated for ±2000 V HBM and ±500 V CDM per JEDEC standards, providing robust protection against handling and system-level ESD events. Its inputs are not diode-clamped to the rails, so external current limiting (≤10 mA) is required for inputs exceeding V±0.5 V - a design consideration explicitly documented in Section 6.1 and Figure 21 of the SBOS213H datasheet. This ESD resilience supports reliable deployment in field-deployed safety devices such as CO detectors and fire alarm sensors.
Is the OPA348AIDCKTG4 pin-compatible with other members of the OPAx348 family?
No - the OPA348AIDCKTG4 (single-channel, SC70-5) is not pin-compatible with dual-channel OPA2348 or quad-channel OPA4348 variants, which use 8-pin and 14-pin packages respectively. Even among single-channel versions, the SC70-5 (OPA348AIDCKTG4), SOT-23-5 (OPA348AIDBVR), and SOIC-8 (OPA348AIDR) variants have different pinouts and footprints. Pin mapping must be verified per package drawing: SC70-5 assigns V+ to pin 5, V– to pin 4, +IN to pin 3, –IN to pin 2, and OUT to pin 1 - a layout unique to the DCK variant.
OPA348AIDCKTG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 5-TSSOP, SC-70-5, SOT-353
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 1
- 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
- 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:
- SC-70-5
OPA348AIDCKTG4 FAQ
1.How can I place an order for OPA348AIDCKTG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA348AIDCKTG4 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 OPA348AIDCKTG4 reliable?
The price and inventory of OPA348AIDCKTG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA348AIDCKTG4 is usually 5 days.
3.What payment methods are accepted for OPA348AIDCKTG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA348AIDCKTG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA348AIDCKTG4?
OPA348AIDCKTG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA348AIDCKTG4 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 OPA348AIDCKTG4?
For technical support, including OPA348AIDCKTG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA348AIDCKTG4 requirements.
6.How does Aetrix verify that OPA348AIDCKTG4 is sourced from the original manufacturer or authorized distributors?
All OPA348AIDCKTG4 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 OPA348AIDCKTG4 meets industry standards.
7.What is the process for return or replacement of OPA348AIDCKTG4?
All OPA348AIDCKTG4 units undergo pre-shipment inspection (PSI). If there is an issue with OPA348AIDCKTG4, 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 OPA348AIDCKTG4 part is unused and in its original packaging.
Return procedure for OPA348AIDCKTG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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