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Texas Instruments OPA349SA/250
- Part No.:
- OPA349SA/250
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
OPA349SA/250.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT SC70-5
- Quantity:
- Payment:
- Shipping:
Inventory:749
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Product details
Overview
OPA349SA/250 from Texas Instruments is a single-channel, ultra-low-power, rail-to-rail input/output CMOS operational amplifier optimized for battery-powered systems. It delivers 70kHz gain-bandwidth, 1µA quiescent current, 90dB open-loop gain, and operates from 1.8V to 5.5V supply - enabling precision signal conditioning in solar-powered sensors and smoke detectors where microamp-level power budgeting is critical.
For engineers reviewing the OPA349SA/250 datasheet, OPA349SA/250 pinout, OPA349SA/250 application, or OPA349SA/250 equivalent, key selection criteria include guaranteed rail-to-rail input range (200mV beyond rails), output swing within 350mV of rails at 10kΩ load, unity-gain stability without external compensation, and SC70-5 package compatibility with high-density portable PCB layouts.
Technical Context
The OPA349SA/250 employs a complementary differential input stage (N- and P-channel pairs) to achieve rail-to-rail common-mode input range extending 200mV beyond V– and V+, with a defined 400mV transition region where both pairs operate. Its fully differential output stage supports rail-to-rail swing while maintaining 8mA drive capability into resistive loads.
Designed for single-supply operation, it features internal biasing that ensures stable 1µA quiescent current across 1.8V–5.5V and 0°C to +85°C operating temperature. The device is unity-gain stable with no required external compensation, and its 70kHz GBW enables low-frequency filtering and sensor buffering without phase-margin degradation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.8V to 5.5V - supports direct connection to single Li-ion, alkaline, or solar-cell sources without regulation. |
| Quiescent Current | 1µA (typ) - enables multi-year battery life in always-on remote sensors and fire detection nodes. |
| Gain-Bandwidth Product | 70kHz - sufficient for anti-aliasing, sensor amplification, and A/D driver stages up to ~10kHz signals. |
| Input Bias Current | 10pA (max) - permits use of >10MΩ feedback/source resistors without significant offset error. |
| Input Common-Mode Range | (V–) – 0.2V to (V+) + 0.2V - allows direct sensing of signals near ground or supply rails in single-supply systems. |
| Output Swing (10kΩ) | Within 350mV of rails - preserves >90% dynamic range when driving ADCs referenced to same supply. |
| Open-Loop Gain | 90dB (min 74dB) - ensures <0.1% gain error in unity-gain buffers with 1MΩ load. |
Pinout & Package
OPA349SA/250 is housed in a 5-pin SC70 (DCK) surface-mount package measuring 2.0mm × 2.0mm × 1.1mm, optimized for space-constrained portable electronics and PCMCIA cards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - V+ | Positive Supply | Accepts 1.8V–5.5V; requires local 0.01µF ceramic bypass to minimize supply noise coupling. |
| 2 - Out | Amplifier Output | Capable of ±8mA drive; swings to within 350mV of V+ or V– under 10kΩ load. |
| 3 - +In | Non-Inverting Input | High-impedance node (10¹³Ω || 4pF); accepts signals up to 200mV beyond V+ or V–. |
| 4 - V– | Negative Supply / Ground | Reference for single-supply operation; must be tied to system ground or negative rail. |
| 5 - –In | Inverting Input | Differential input paired with +In; matched bias current enables precision transimpedance designs. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input range | Extends 200mV beyond both supply rails - eliminates level-shifting circuitry for ground-referenced sensor outputs. |
| Unity-gain stable | No external compensation required - reduces BOM count and layout complexity in buffer and gain-of-one configurations. |
| Ultra-low input bias current | ≤10pA max - enables high-impedance pH, thermopile, or photodiode front-ends without guard traces or leakage mitigation. |
| Wide supply voltage range | 1.8V to 5.5V - maintains performance across full discharge curve of 2-cell alkaline or single Li-ion batteries. |
| SC70-5 package | 2.0mm × 2.0mm footprint - fits within tight spacing constraints of wearable medical monitors and compact smoke alarms. |
Applications
| Battery-Powered Smoke Detection | Solar-Powered Remote Sensor Node |
|---|---|
|
Use Scenario: Amplifying low-level ionization chamber current in battery-operated smoke alarms with 10-year shelf life. IC Role / Device Role / Timing Role: Transimpedance amplifier converting pA-level chamber current to measurable voltage, operating continuously at 1µA quiescent current. Use Value: Enables decade-long battery life without compromising sensitivity, leveraging 10pA input bias and rail-to-rail input to capture full chamber signal swing. |
Use Scenario: Signal conditioning for thermistor and CO₂ sensor outputs in off-grid environmental monitoring stations powered by small solar panels. IC Role / Device Role / Timing Role: Precision buffer and filter driver preceding 12-bit SAR ADC, operating from unregulated 2.2V–5.0V solar harvest voltage. Use Value: Maintains accuracy across wide supply range and temperature (0°C to +85°C), with 70kHz bandwidth supporting 10Hz sensor update rates and anti-aliasing. |
| Portable Medical Pulse Oximeter | PCMCIA Card Analog Front-End |
|
Use Scenario: Amplifying weak red/IR photodiode signals in handheld pulse oximeters powered by coin-cell batteries. IC Role / Device Role / Timing Role: Low-noise, rail-to-rail I/O amplifier in correlated double sampling path, rejecting LED switching transients. Use Value: 300nV/√Hz input voltage noise and 8mA output drive ensure clean signal delivery to ADC despite aggressive power gating. |
Use Scenario: Signal conditioning for analog I/O on legacy PCMCIA data acquisition cards with strict board area limits. IC Role / Device Role / Timing Role: Unity-gain buffer isolating high-impedance sensor inputs from multiplexer switch capacitance and trace parasitics. Use Value: SC70-5 package (2.0mm²) and 1µA IQ allow integration of multiple channels per card without thermal or power density penalties. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ultra-low-power op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV2401IDBVR | 1µA IQ, 5.5kHz GBW, rail-to-rail I/O - lower bandwidth and higher input offset (±1.5mV typ) than OPA349SA/250. | Best suited for DC-coupled sensor offsets and low-speed threshold detection, not AC-coupled signal chains requiring >10kHz fidelity. | Select TLV2401IDBVR only when bandwidth demand is ≤5kHz and cost sensitivity outweighs precision requirements. |
| OPA347UA/2K5 | 20µA IQ, 350kHz GBW, rail-to-rail I/O - 20× higher supply current but 5× wider bandwidth and lower input noise (25nV/√Hz). | Appropriate for higher-speed portable instrumentation (e.g., handheld multimeters) where microamp savings are secondary to settling time and SNR. | Choose OPA347UA/2K5 when system-level power budget allows >10µA per channel and signal bandwidth exceeds 20kHz. |
Compared with TLV2401IDBVR and OPA347UA/2K5, the OPA349SA/250 uniquely balances sub-µA quiescent current with 70kHz bandwidth and rail-to-rail operation in a 2mm² SC70 package - making it the only option for long-life, space-constrained, medium-bandwidth sensor interfaces.
Availability
OPA349SA/250 is available at Aetrix Electronics and suitable for battery packs, smoke/fire detection systems, and solar-powered remote sensors requiring stable component supply with guaranteed long-term manufacturability and consistent parametric performance.
Supply support for OPA349SA/250 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 OPA349 series belongs to TI's precision micropower op amp product line, engineered specifically for energy-constrained applications including portable medical devices, wireless sensor networks, and battery-backed safety systems.
FAQ
What is the operating temperature range for the OPA349SA/250?
The OPA349SA/250 is specified for operation from 0°C to +85°C, with storage temperature rated from –65°C to +150°C. Its electrical characteristics-including 1µA quiescent current and 70kHz gain-bandwidth-are guaranteed over the full 0°C to +70°C range, making it suitable for indoor consumer and industrial environments where ambient extremes are limited.
Does the OPA349SA/250 require external compensation for unity-gain stability?
No, the OPA349SA/250 is internally compensated and unity-gain stable without any external components. This eliminates the need for feedback capacitors or complex compensation networks, simplifying design in buffer, voltage-follower, and gain-of-one configurations-critical for minimizing bill-of-materials in portable equipment.
What is the maximum output current capability of the OPA349SA/250?
The OPA349SA/250 delivers ±8mA output current into resistive loads, with short-circuit current rated at ±10mA. This enables direct driving of 12-bit SAR ADC reference inputs, LED indicators, or moderate-impedance filters without external buffers-while maintaining rail-to-rail swing down to 350mV from each supply rail at 10kΩ load.
Can the OPA349SA/250 operate from a 1.8V supply while maintaining full specifications?
Yes, the OPA349SA/250 is fully specified and tested from 1.8V to 5.5V. At 1.8V, it retains 70kHz gain-bandwidth, 1µA quiescent current, rail-to-rail input/output swing, and 90dB open-loop gain - ensuring consistent performance across the entire battery discharge curve of two alkaline cells or single LiFePO₄ cells.
What package type is used for the OPA349SA/250, and what are its key mechanical dimensions?
The OPA349SA/250 uses the SC70-5 (DCK) package: a 5-pin, leadless surface-mount outline measuring 2.0mm × 2.0mm × 1.1mm height, with 0.65mm pin pitch. Its compact footprint and exposed pad-compatible land pattern support high-density routing in wearables, smoke detectors, and PCMCIA cards where board area is at a premium.
OPA349SA/250 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 5-TSSOP, SC-70-5, SOT-353
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 1
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 0.02V/µs
- Gain Bandwidth Product:
- 70 kHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 0.5 pA
- Voltage - Input Offset:
- 2 mV
- Current - Supply:
- 1µA
- Current - Output / Channel:
- 8 mA
- Voltage - Supply Span (Min):
- 1.8 V
- Voltage - Supply Span (Max):
- 5.5 V
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-5
OPA349SA/250 FAQ
1.How can I place an order for OPA349SA/250 through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA349SA/250 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 OPA349SA/250 reliable?
The price and inventory of OPA349SA/250 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA349SA/250 is usually 5 days.
3.What payment methods are accepted for OPA349SA/250?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA349SA/250 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA349SA/250?
OPA349SA/250 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA349SA/250 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 OPA349SA/250?
For technical support, including OPA349SA/250 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA349SA/250 requirements.
6.How does Aetrix verify that OPA349SA/250 is sourced from the original manufacturer or authorized distributors?
All OPA349SA/250 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 OPA349SA/250 meets industry standards.
7.What is the process for return or replacement of OPA349SA/250?
All OPA349SA/250 units undergo pre-shipment inspection (PSI). If there is an issue with OPA349SA/250, 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 OPA349SA/250 part is unused and in its original packaging.
Return procedure for OPA349SA/250:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
OPA349SA/250 Tags
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LM358DT
STMicroelectronics
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LM358DR
Texas Instruments
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LM2904DR
Texas Instruments
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LM358ADR
Texas Instruments
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LM2904DGKR
Texas Instruments
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LM324DR
Texas Instruments
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MCP6006T-E/OT
Microchip Technology
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MCP6006UT-E/OT
Microchip Technology
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LM324PWR
Texas Instruments
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LM2902PWR
Texas Instruments
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LM2902DR
Texas Instruments
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LM358P
Texas Instruments
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