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Texas Instruments OPA349SA/3KG4
- Part No.:
- OPA349SA/3KG4
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
OPA349SA/3KG4.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT SC70-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,668
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Product details
Overview
OPA349SA/3KG4 from Texas Instruments is an ultra-low-power, rail-to-rail input/output CMOS operational amplifier optimized for battery-powered systems. It delivers 70kHz gain-bandwidth with only 1µA quiescent current, supports 1.8V–5.5V supply, and features 10pA max input bias current - enabling high-impedance sensor interfacing in portable smoke detectors and solar-powered remote sensors.
For engineers reviewing the OPA349SA/3KG4 datasheet, OPA349SA/3KG4 pinout, OPA349SA/3KG4 application, or OPA349SA/3KG4 equivalent, key selection criteria include micropower operation under 1.8V, rail-to-rail I/O swing within 350mV of rails, unity-gain stability without external compensation, and SC70-5 package compatibility with high-density PCB layouts.
Technical Context
The OPA349SA/3KG4 employs a complementary differential input stage (N-channel + P-channel pairs) to achieve rail-to-rail common-mode input range extending 200mV beyond both supply rails. Its internal class-AB output stage enables 8mA drive capability while maintaining low distortion across the full output swing.
It operates as a single-supply, unity-gain stable amplifier with no need for external phase compensation. The open-loop gain of 90dB and 70kHz GBW are maintained across the full 1.8V–5.5V supply range and 0°C to +70°C temperature range, ensuring consistent performance in low-battery conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Quiescent Current | 1 µA - enables multi-year battery life in always-on remote sensors and smoke detectors |
| Gain-Bandwidth Product | 70 kHz - sufficient for anti-aliasing filters and slow-signal conditioning in gas detection circuits |
| Input Bias Current | 10 pA (max) - allows use of >10MΩ feedback/source resistors without significant offset error |
| Rail-to-Rail Input Range | Extends 200 mV beyond rails - supports direct sensing of signals near ground or VCC in single-supply systems |
| Output Swing | Within 350 mV of rails at 10kΩ load - preserves dynamic range for ADC driving in 1.8V–5.5V systems |
| Open-Loop Gain | 90 dB - ensures <0.1% gain error in precision buffer and instrumentation amplifier configurations |
| Supply Voltage Range | 1.8 V to 5.5 V - operates across full lithium coin-cell (2.0–3.0V) and alkaline (1.8–5.5V) discharge curves |
Pinout & Package
OPA349SA/3KG4 is packaged in a 5-pin SC70 (DCK) surface-mount package measuring 2.0 mm × 2.0 mm × 0.9 mm, optimized for space-constrained portable electronics and PCMCIA cards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (V−) | Negative supply / ground reference | Connects to system ground or negative rail; supports single-supply operation down to 1.8V |
| 2 (+In) | Non-inverting input | High-impedance node (10¹³ Ω || 4 pF); accepts signals up to 200 mV beyond V− or V+ |
| 3 (Out) | Amplifier output | Drives loads up to 8 mA; swings to within 350 mV of V− or V+ under 10kΩ load |
| 4 (V+) | Positive supply | Accepts 1.8V–5.5V; bypass with 0.01 µF ceramic capacitor for stability |
| 5 (−In) | Inverting input | Matches +In in impedance and rail-to-rail common-mode range; used in transimpedance or difference amplifiers |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low quiescent current | 1 µA enables >10-year battery life in coin-cell–powered smoke detectors with periodic wake-up sampling |
| Rail-to-rail input and output | 200 mV beyond rails input + 350 mV to rails output maximizes usable signal range in 1.8V systems |
| Unity-gain stable | No external compensation required - simplifies layout and reduces BOM count in filter and buffer designs |
| Wide supply range | 1.8V–5.5V operation maintains performance across full battery discharge, eliminating brown-out resets |
| Low input bias current | 10 pA max allows >100 MΩ source impedances in thermistor or photodiode front-ends without gain error |
Applications
| Battery-Powered Smoke Detection | Solar-Powered Remote Sensor Node |
|---|---|
Use Scenario: Continuous monitoring of ionization chamber current in battery-operated residential smoke alarms. IC Role / Device Role / Timing Role: Precision current-to-voltage converter and low-drift buffer feeding 12-bit ADC. Use Value: 1 µA quiescent current extends AA/AAA battery life to >5 years; rail-to-rail I/O captures full chamber signal swing near ground. | Use Scenario: Signal conditioning for soil moisture and temperature sensors in off-grid agricultural telemetry units powered by small solar panels. IC Role / Device Role / Timing Role: Low-power sensor interface amplifier with programmable gain for analog sensor outputs. Use Value: 1.8V minimum supply allows operation during low-light battery voltage sag; 10 pA input bias prevents leakage-induced drift in high-Z resistive sensors. |
| Portable Medical Pulse Oximeter | PCMCIA Card Analog Front-End |
Use Scenario: Amplifying weak red/IR photodiode currents in handheld pulse oximeters powered by rechargeable Li-ion cells. IC Role / Device Role / Timing Role: Transimpedance amplifier with selectable gain for optical signal acquisition. Use Value: Rail-to-rail output swing ensures full-scale ADC utilization even at 2.5V supply; 70kHz GBW supports pulse waveform fidelity. | Use Scenario: Signal buffering and level-shifting for analog I/O on legacy PCMCIA expansion cards used in industrial data loggers. IC Role / Device Role / Timing Role: Input protection and drive-strengthening buffer between card-edge connector and on-board ADC/DAC. Use Value: SC70-5 footprint minimizes board area in tight PCMCIA Type II form factor; 8mA output drives long traces without external drivers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV2401IDBVR | Same 1µA IQ and rail-to-rail I/O, but lower 5.5kHz GBW and higher 250nV/√Hz input noise | Less suitable for bandwidth-critical sensor filtering; better for ultra-low-IQ DC-coupled references | Select TLV2401IDBVR only when GBW <10kHz suffices and lowest possible noise floor is secondary |
| OPA347UA/2K5 | 20µA IQ, 350kHz GBW, same SC70-5 package; higher drive (25mA), wider temp range (–40°C to +125°C) | Requires more power but supports faster settling and harsher environments like automotive cabin sensors | Choose OPA347UA/2K5 when system demands >100kHz signal bandwidth or extended temperature operation |
Compared with TLV2401IDBVR and OPA347UA/2K5, the OPA349SA/3KG4 uniquely balances sub-µA quiescent current with 70kHz bandwidth and rail-to-rail operation in SC70 - making it optimal for long-life, space-constrained, single-supply sensor nodes where moderate speed and minimal power dominate design priorities.
Availability
OPA349SA/3KG4 is available at Aetrix Electronics and suitable for battery packs, portable medical devices, and solar-powered remote sensors requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for OPA349SA/3KG4 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 op amps and low-power signal chain solutions.
The OPA349 series belongs to TI's micropower precision op amp product line, engineered specifically for energy-constrained applications such as portable instrumentation, battery-backed safety systems, and wireless sensor nodes where every nanoamp counts.
FAQ
What is the operating temperature range for the OPA349SA/3KG4?
The OPA349SA/3KG4 is specified for 0°C to +70°C ambient operation, with storage range from –65°C to +150°C. Its SC70 package has a thermal resistance (θJA) of 250°C/W. Performance parameters including quiescent current, input bias current, and open-loop gain are guaranteed across this range per the SBOS121B datasheet. The OPA349SA/3KG4 is not rated for operation below 0°C.
Does the OPA349SA/3KG4 require external compensation for unity-gain stability?
No, the OPA349SA/3KG4 is internally compensated and unity-gain stable without external components. Its architecture eliminates the need for feedback capacitors or gain-setting networks to ensure stability - a key advantage over many micropower op amps. This simplifies design in buffer, follower, and low-gain filter configurations. The OPA349SA/3KG4 remains stable across its full 1.8V–5.5V supply range and 0°C to +70°C temperature range.
What is the maximum output current capability of the OPA349SA/3KG4?
The OPA349SA/3KG4 delivers ±8 mA continuous output current into resistive loads, with ±10 mA short-circuit current capability. Output voltage swing degrades to within 350 mV of the rails at 10 kΩ load, and to within 300 mV at 1 MΩ load. For sustained 8 mA output, ensure adequate PCB copper area and thermal relief to manage self-heating, especially in the SC70 package where θJA = 250°C/W.
Can the OPA349SA/3KG4 be used with a 1.8V single supply?
Yes, the OPA349SA/3KG4 is fully specified and tested for operation from 1.8V to 5.5V single supply. At 1.8V, it maintains 1 µA quiescent current, 70 kHz gain-bandwidth, rail-to-rail input (extending 200 mV beyond rails), and output swing to within 350 mV of both rails under 10 kΩ load. This makes the OPA349SA/3KG4 ideal for coin-cell and low-voltage alkaline systems where headroom is constrained.
What package type does the OPA349SA/3KG4 use, and what are its dimensions?
The OPA349SA/3KG4 uses the SC70-5 (DCK) package: a 5-pin, surface-mount, leadless plastic package measuring 2.0 mm × 2.0 mm × 0.9 mm (body), with 0.65 mm pin pitch. Pin 1 marking is a dot; orientation follows JEDEC standard Q3 quadrant in tape-and-reel. Land pattern and stencil design guidelines are provided in TI's DCK0005A package outline - critical for reliable reflow soldering in high-density layouts.
OPA349SA/3KG4 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:
- 0.02V/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/3KG4 FAQ
1.How can I place an order for OPA349SA/3KG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA349SA/3KG4 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/3KG4 reliable?
The price and inventory of OPA349SA/3KG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA349SA/3KG4 is usually 5 days.
3.What payment methods are accepted for OPA349SA/3KG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA349SA/3KG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA349SA/3KG4?
OPA349SA/3KG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA349SA/3KG4 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/3KG4?
For technical support, including OPA349SA/3KG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA349SA/3KG4 requirements.
6.How does Aetrix verify that OPA349SA/3KG4 is sourced from the original manufacturer or authorized distributors?
All OPA349SA/3KG4 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/3KG4 meets industry standards.
7.What is the process for return or replacement of OPA349SA/3KG4?
All OPA349SA/3KG4 units undergo pre-shipment inspection (PSI). If there is an issue with OPA349SA/3KG4, 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/3KG4 part is unused and in its original packaging.
Return procedure for OPA349SA/3KG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
OPA349SA/3KG4 Tags
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