My Inquiry
My Account
Texas Instruments OPA349UAG4
- Part No.:
- OPA349UAG4
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA349UAG4.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,046
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
OPA349UAG4 from Texas Instruments is a single, 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 - enabling precision signal conditioning in space-constrained, energy-sensitive applications such as smoke detectors and portable medical sensors.
For engineers reviewing the OPA349UAG4 datasheet, OPA349UAG4 pinout, OPA349UAG4 application, or OPA349UAG4 equivalent, key selection criteria include its 10pA max input bias current, 350mV rail-to-rail output swing at 10kΩ load, unity-gain stability without external compensation, and SC70-5/SOT23-5/SO-8 package compatibility across temperature grades.
Technical Context
The OPA349UAG4 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 control circuitry enables stable operation with capacitive loads up to 500pF while maintaining 70kHz bandwidth at unity gain.
It features a low-noise architecture (300nV/√Hz at 1kHz), high open-loop gain (90dB), and robust PSRR/CMRR performance across 1.8V–5.5V supplies - all verified over 0°C to +85°C operating temperature per SO-8 packaging specifications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.8V to 5.5V - supports direct operation from single-cell Li-ion or alkaline batteries without regulation. |
| Quiescent Current | 1µA - enables multi-year battery life in always-on remote sensor nodes. |
| Gain-Bandwidth Product | 70kHz - sufficient for DC-coupled sensor interfaces and anti-aliasing filters below 10kHz. |
| Input Bias Current | 10pA (max) - permits use of >10MΩ feedback/source resistors without significant offset error. |
| Rail-to-Rail Output Swing | 350mV from rails at 10kΩ load - preserves dynamic range in low-voltage ADC driver stages. |
| Open-Loop Gain | 90dB - ensures <0.1% gain error in precision buffer configurations with 10kΩ load. |
| Input Common-Mode Range | (V−) − 0.2V to (V+) + 0.2V - allows direct sensing of signals near ground or supply in single-supply systems. |
Pinout & Package
OPA349UAG4 is packaged in an SO-8 surface-mount package (Package Drawing D), with thermal resistance θJA = 150°C/W. Pin 1 is located at the top-left corner adjacent to the index area, with pin 1 quadrant Q1 in tape-and-reel orientation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (NC) | No internal connection | Unused pad; must be left floating or grounded per layout guidelines - no electrical function. |
| 2 (V+) | Positive supply | Accepts 1.8V–5.5V; requires 0.01µF ceramic bypass capacitor to ground for stability. |
| 3 (Out) | Amplifier output | Drives up to ±8mA; swings within 350mV of rails into 10kΩ - suitable for driving SAR ADC reference buffers. |
| 4 (NC) | No internal connection | Unused pad; electrically isolated - no routing or soldering required. |
| 5 (NC) | No internal connection | Unused pad; no internal bond wire - may be omitted in PCB layout. |
| 6 (−In) | Inverting input | Differential node with 10pA max bias current; sensitive to ESD - requires guard ring in high-impedance designs. |
| 7 (+In) | Non-inverting input | High-impedance node (10¹³Ω || 4pF); supports rail-to-rail common-mode input down to V− − 0.2V. |
| 8 (V−) | Negative supply / Ground | Reference node for single-supply operation; connects to system ground or negative rail. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input stage | Complementary N/P-channel pair extends common-mode range 200mV beyond rails - eliminates level-shifting in low-voltage sensor front-ends. |
| Unity-gain stable | No external compensation required - simplifies design of gain-of-1 buffers for ADC inputs or reference voltage followers. |
| Ultra-low power consumption | 1µA quiescent current enables continuous monitoring in battery-powered fire detection systems with >5-year shelf life. |
| Wide supply voltage range | Operates from 1.8V to 5.5V with minimal parameter shift - maintains accuracy across full battery discharge curve. |
| Low input bias current | 10pA max enables high-impedance pH electrode or thermopile signal conditioning without guard traces. |
Applications
| Battery-Powered Smoke Detectors | Portable Medical Sensors |
|---|---|
Use Scenario: Continuous analog signal amplification from ionization chamber or photoelectric sensor in mains-independent residential alarm units. IC Role / Device Role / Timing Role: Precision DC-coupled transimpedance amplifier converting picoamp-level current pulses into measurable voltage. Use Value: 10pA input bias current prevents signal loss across high-value feedback resistors; 1µA IQ extends battery life beyond 7 years at 10-second sampling intervals. | Use Scenario: Signal conditioning for wearable ECG or pulse oximetry front-ends powered by coin-cell batteries. IC Role / Device Role / Timing Role: Rail-to-rail input buffer isolating electrode interface from ADC input, preserving signal integrity near ground and supply rails. Use Value: 350mV output swing at 10kΩ load maximizes usable dynamic range for 12-bit ADCs operating on 3.3V supplies. |
| Solar-Powered Environmental Monitors | PCMCIA Card Analog Interfaces |
Use Scenario: Low-power signal chain in remote soil moisture or air quality sensors powered by small photovoltaic cells. IC Role / Device Role / Timing Role: Micropower filter amplifier driving SAR ADC input with minimal loading on energy-harvesting storage capacitors. Use Value: 70kHz GBW supports anti-aliasing filtering up to 10kHz; 1.8V minimum supply enables operation during low-light conditions. | Use Scenario: Analog signal routing and level adaptation in legacy PCMCIA peripheral cards with tight board area constraints. IC Role / Device Role / Timing Role: Compact SO-8 op amp providing gain, offset adjustment, and drive capability for card-edge I/O interfaces. Use Value: SO-8 footprint ensures mechanical compatibility with existing PCMCIA layouts while delivering rail-to-rail performance unattainable with older µPower op amps. |
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 lower 5.5kHz GBW and 70dB open-loop gain. | Less suitable for precision ADC buffering above 1kHz due to reduced bandwidth and gain. | Select TLV2401IDBVR only when bandwidth demand is ≤5kHz and cost sensitivity outweighs precision requirements. |
| OPA347UA | 20µA IQ, 500kHz GBW, wider 1.8V–5.5V supply, but not unity-gain stable without compensation. | Requires external compensation capacitor for unity-gain use - increases BOM count and layout complexity. | Choose OPA347UA when higher speed and drive strength justify 20× higher quiescent current and added design overhead. |
Compared with TLV2401IDBVR and OPA347UA, the OPA349UAG4 uniquely balances ultra-low power (1µA), unity-gain stability, and 70kHz bandwidth in a standard SO-8 package - making it optimal for precision, battery-limited signal chains where simplicity and longevity are critical.
Availability
OPA349UAG4 is available at Aetrix Electronics and suitable for battery packs, portable medical devices, and solar-powered environmental monitors requiring stable component supply with long-term lifecycle support.
Supply support for OPA349UAG4 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 amp design and low-power signal conditioning.
The OPA349UAG4 belongs to TI's OPA349 family of micropower rail-to-rail op amps, engineered specifically for extended-life battery applications demanding sub-µA quiescent current without sacrificing DC precision or AC performance.
FAQ
What is the operating temperature range for the OPA349UAG4?
The OPA349UAG4 is specified for operation from 0°C to +85°C, with full electrical performance guaranteed over 0°C to +70°C. Its SO-8 package supports reliable thermal dissipation up to 150°C junction temperature, making it suitable for consumer and industrial environments where ambient temperatures remain within this range.
Does the OPA349UAG4 require external compensation for unity-gain stability?
No, the OPA349UAG4 is internally compensated and unity-gain stable without any external components. This eliminates the need for compensation capacitors in buffer or gain-of-one configurations - reducing bill-of-materials count and improving layout simplicity in space-constrained designs.
What is the maximum output current drive capability of the OPA349UAG4?
The OPA349UAG4 provides ±8mA output current into resistive loads, with short-circuit current rated at ±10mA. This enables direct driving of moderate-impedance loads such as ADC reference inputs, LED bias networks, or low-power transducers without external buffering.
Can the OPA349UAG4 operate from a 1.8V supply while maintaining full specification?
Yes, the OPA349UAG4 is fully characterized and tested from 1.8V to 5.5V. Key parameters including quiescent current (1µA), input bias current (≤10pA), and rail-to-rail input/output behavior remain valid across this entire supply range - ensuring consistent performance as battery voltage declines.
Is the OPA349UAG4 pin-compatible with other members of the OPA349 family?
The OPA349UAG4 uses the SO-8 package (D) with NC pins at positions 1, 4, and 5. It is not pin-compatible with SOT23-5 or SC70-5 variants (e.g., OPA349NA, OPA349SA), which have different pin counts and assignments. Always verify pin mapping against the specific package drawing before PCB layout.
OPA349UAG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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:
- 8-SOIC
OPA349UAG4 FAQ
1.How can I place an order for OPA349UAG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA349UAG4 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 OPA349UAG4 reliable?
The price and inventory of OPA349UAG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA349UAG4 is usually 5 days.
3.What payment methods are accepted for OPA349UAG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA349UAG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA349UAG4?
OPA349UAG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA349UAG4 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 OPA349UAG4?
For technical support, including OPA349UAG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA349UAG4 requirements.
6.How does Aetrix verify that OPA349UAG4 is sourced from the original manufacturer or authorized distributors?
All OPA349UAG4 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 OPA349UAG4 meets industry standards.
7.What is the process for return or replacement of OPA349UAG4?
All OPA349UAG4 units undergo pre-shipment inspection (PSI). If there is an issue with OPA349UAG4, 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 OPA349UAG4 part is unused and in its original packaging.
Return procedure for OPA349UAG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
OPA349UAG4 Tags
-
LM358DT
STMicroelectronics
-
LM358DR
Texas Instruments
-
LM2904DR
Texas Instruments
-
LM358ADR
Texas Instruments
-
LM2904DGKR
Texas Instruments
-
LM324DR
Texas Instruments
-
MCP6006T-E/OT
Microchip Technology
-
MCP6006UT-E/OT
Microchip Technology
-
LM324PWR
Texas Instruments
-
LM2902PWR
Texas Instruments
-
LM2902DR
Texas Instruments
-
LM358P
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
