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Texas Instruments OPA349SA/3K
- Part No.:
- OPA349SA/3K
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
OPA349SA/3K.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT SC70-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,029
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Product details
Overview
OPA349SA/3K from Texas Instruments is a single-channel, rail-to-rail input/output CMOS operational amplifier optimized for ultra-low-power battery-operated systems. It delivers 70kHz gain-bandwidth, 1µA quiescent current, and operates from 1.8V to 5.5V supply, with input extending 200mV beyond rails and output swinging within 350mV of rails - enabling high dynamic range in space-constrained portable instrumentation.
For engineers reviewing the OPA349SA/3K datasheet, OPA349SA/3K pinout, OPA349SA/3K application, or OPA349SA/3K equivalent, key selection criteria include micropower operation under 1µA, rail-to-rail I/O capability at sub-2V supply, SC70-5 package footprint, unity-gain stability without external compensation, and verified performance across 0°C to +70°C ambient.
Technical Context
The OPA349SA/3K employs a complementary differential input stage (N-channel + P-channel pairs) to achieve rail-to-rail common-mode input range, with a 400mV transition region where both pairs conduct - requiring design awareness for CMRR and THD degradation in that zone. Its unity-gain stable architecture eliminates need for external phase compensation.
It uses a Class AB output stage delivering ±8mA drive into 10kΩ loads while maintaining rail-to-rail swing, and features internal reference current generation enabling stable operation down to 1.8V with minimal supply sensitivity across temperature and voltage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.8V to 5.5V - supports direct connection to single-cell Li-ion (3.0–4.2V), NiMH (1.2V×2), or coin-cell (3V) without regulation. |
| Quiescent Current | 1µA typical - enables >1-year battery life in always-on sensor nodes powered by CR2032 (225mAh). |
| Gain-Bandwidth Product | 70kHz - sufficient for anti-aliasing filters, sensor signal conditioning, and low-speed A/D driver applications. |
| Input Common-Mode Range | (V−) − 0.2V to (V+) + 0.2V - allows direct sensing of signals below ground or above supply in single-supply systems. |
| Output Swing | Within 350mV of rails (RL = 10kΩ) - preserves >90% of full-scale dynamic range at 1.8V supply. |
| Open-Loop Gain | 90dB typical - ensures <0.1% gain error in unity-gain buffer configurations with 10kΩ feedback. |
| Input Bias Current | 10pA max - permits use of >10MΩ source resistors without significant offset drift or signal attenuation. |
Pinout & Package
OPA349SA/3K is packaged in SC70-5 (DCK), a 1.25mm × 2.0mm surface-mount package with 0.65mm pitch, optimized for high-density portable PCBs. Thermal resistance θJA is 250°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (V−) | Negative supply / ground reference | Return path for bias current and output stage; must be low-impedance for rail-to-rail output fidelity. |
| 2 (+In) | Non-inverting input | Differential input node with 10pA max bias current; accepts signals up to 200mV beyond V− or V+. |
| 3 (−In) | Inverting input | Differential input node; used for feedback in standard configurations; matched to +In for CMRR optimization. |
| 4 (Out) | Amplifier output | Class AB stage capable of ±8mA drive; swings to within 350mV of V− or V+ under 10kΩ load. |
| 5 (V+) | Positive supply | Primary power rail; bypassing with 0.01µF ceramic capacitor near pin is mandatory for stability. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input with 200mV beyond rails | Enables direct interface to unbuffered sensors or ADC references without level-shifting circuitry. |
| Unity-gain stable, no external compensation | Reduces BOM count and layout area; eliminates risk of instability due to incorrect capacitor selection. |
| 1µA quiescent current at 1.8V–5.5V | Permits continuous operation in energy-harvesting nodes (e.g., solar-powered remote sensors) with µW-level budgets. |
| SC70-5 package (1.25 × 2.0 mm) | Supports miniaturized designs such as wearable health monitors and compact smoke detector modules. |
| Specified from 0°C to +70°C ambient | Validated for consumer electronics and industrial control panels operating in non-extended temperature environments. |
Applications
| Battery-Powered Sensor Interfaces | Low-Voltage A/D Converter Drivers |
|---|---|
Use Scenario: Signal conditioning for thermistor, photodiode, or gas sensor outputs in wireless IoT nodes powered by CR2032 or single Li-ion cells. IC Role / Device Role / Timing Role: Precision buffer and gain stage ensuring full-scale utilization of 10–12-bit SAR ADCs with minimal power overhead. Use Value: 1µA IQ extends node lifetime >2 years; rail-to-rail I/O avoids external bias networks, reducing component count by 3–4 passives per channel. | Use Scenario: Driving the analog input of microcontroller-integrated ADCs (e.g., MSP430, STM32L0) in portable medical devices. IC Role / Device Role / Timing Role: Low-noise, low-output-impedance interface between high-impedance sensor sources and sampling capacitors. Use Value: 300nV/√Hz input noise and 350mV rail swing preserve SNR >60dB at 1.8V supply; unity-gain stability prevents sampling distortion. |
| Solar-Powered Environmental Monitors | Smoke/Gas Detection Front-Ends |
Use Scenario: Amplifying weak signals from pyroelectric motion sensors or CO₂ NDIR detectors in off-grid environmental stations. IC Role / Device Role / Timing Role: Micropower transimpedance amplifier and filter stage operating directly from supercapacitor storage. Use Value: 10pA input bias enables >100MΩ feedback resistors for pA-level current detection; 70kHz GBW supports 10Hz–1kHz signal bandwidths. | Use Scenario: Signal amplification and threshold comparison in UL-certified residential smoke alarms using photoelectric or ionization chambers. IC Role / Device Role / Timing Role: Low-drift, rail-to-rail comparator preamp ensuring reliable detection across battery discharge (1.8V–3.3V). Use Value: Input range extending 200mV beyond rails accommodates chamber bias offsets; 90dB open-loop gain ensures <1mV hysteresis control accuracy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar micropower rail-to-rail op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV2401IDBVR | Same 1µA IQ and rail-to-rail I/O, but 5.5kHz GBW (vs 70kHz); higher input offset (±1.5mV typ vs ±2mV max). | Lower bandwidth limits use in >1kHz sensor filtering; better PSRR (100dB) suits noisy supply environments. | Select TLV2401IDBVR when supply rejection >90dB is critical and bandwidth ≤5kHz suffices. |
| OPA347UA/2K5 | 20µA IQ, 350kHz GBW, SO-8 package; wider supply range (1.8V–5.5V), same rail-to-rail I/O. | Higher drive strength (±20mA) and speed support active filters and faster settling; larger SO-8 footprint increases board area. | Select OPA347UA/2K5 when system requires >100kHz signal chain bandwidth and can accommodate SO-8 layout. |
Compared with TLV2401IDBVR and OPA347UA/2K5, the OPA349SA/3K uniquely balances ultra-low 1µA quiescent current with 70kHz bandwidth and SC70-5 size - making it optimal for space- and energy-constrained applications where neither extreme micropower nor high speed dominates.
Availability
OPA349SA/3K is available at Aetrix Electronics and suitable for battery packs, portable instrumentation, and solar-powered environmental sensors requiring stable component supply with guaranteed long-term sourcing.
Supply support for OPA349SA/3K 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, embedded processing, and connectivity technologies with over 50 years of innovation in precision amplifiers and low-power design.
The OPA349 series belongs to TI's precision micropower op amp product line, engineered specifically for battery longevity and rail-to-rail signal integrity in portable and energy-harvesting systems.
FAQ
What is the operating temperature range specified for the OPA349SA/3K?
The OPA349SA/3K is specified for operation from 0°C to +70°C ambient temperature. While the device may function outside this range, electrical parameters including input offset voltage, CMRR, and quiescent current are only guaranteed within this interval per the SBOS121B datasheet. The SC70-5 package variant (OPA349SA/3K) shares the same temperature specification as the SOT23-5 version.
Does the OPA349SA/3K require external compensation for unity-gain stability?
No, the OPA349SA/3K is internally compensated and unity-gain stable. It does not require external capacitors or resistor networks to maintain stability in buffer, follower, or gain-of-one configurations - a key differentiator from many other micropower op amps that demand careful external phase compensation.
What is the maximum output current drive capability of the OPA349SA/3K?
The OPA349SA/3K delivers ±8mA output current into a 10kΩ load while maintaining rail-to-rail swing. Short-circuit current is ±10mA. This drive strength supports direct interfacing with ADC input capacitors, LED indicators, or moderate-impedance sensor bridges without external buffering.
Can the OPA349SA/3K operate from a 1.8V supply while maintaining rail-to-rail input and output performance?
Yes, the OPA349SA/3K is fully specified and tested from 1.8V to 5.5V. At 1.8V, it retains rail-to-rail input (extending 200mV beyond rails) and output swing (within 350mV of rails at 10kΩ), with only minor reduction in open-loop gain and bandwidth - enabling robust operation across full battery discharge profiles.
What package type and marking code correspond to the OPA349SA/3K orderable part?
The OPA349SA/3K is supplied in the SC70-5 (DCK) package with 5 terminals and a body size of 1.25mm × 2.0mm. Its top-side marking is "S49", as confirmed in TI's PACKAGE OPTION ADDENDUM and ordering information tables.
OPA349SA/3K 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/3K FAQ
1.How can I place an order for OPA349SA/3K through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA349SA/3K 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/3K reliable?
The price and inventory of OPA349SA/3K are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA349SA/3K is usually 5 days.
3.What payment methods are accepted for OPA349SA/3K?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA349SA/3K transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA349SA/3K?
OPA349SA/3K orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA349SA/3K 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/3K?
For technical support, including OPA349SA/3K datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA349SA/3K requirements.
6.How does Aetrix verify that OPA349SA/3K is sourced from the original manufacturer or authorized distributors?
All OPA349SA/3K 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/3K meets industry standards.
7.What is the process for return or replacement of OPA349SA/3K?
All OPA349SA/3K units undergo pre-shipment inspection (PSI). If there is an issue with OPA349SA/3K, 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/3K part is unused and in its original packaging.
Return procedure for OPA349SA/3K:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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