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Texas Instruments OPA344NA/3KG4
- Part No.:
- OPA344NA/3KG4
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SC-74A, SOT-753
- Datasheet:
-
OPA344NA/3KG4.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,358
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Product details
Overview
OPA344NA/3KG4 from Texas Instruments is a single, rail-to-rail input/output CMOS operational amplifier optimized for low-power, single-supply precision applications. It delivers 1 MHz gain-bandwidth, 0.8 V/µs slew rate, ±1 mV max input offset voltage, 150 µA typical quiescent current, and output swing within 1 mV of rails - enabling high-fidelity signal conditioning in PCMCIA cards and data acquisition front-ends.
For engineers reviewing the OPA344NA/3KG4 datasheet, OPA344NA/3KG4 pinout, OPA344NA/3KG4 application, or OPA344NA/3KG4 equivalent, key selection criteria include unity-gain stability, rail-to-rail operation at 2.7–5.5 V supply, sub-250 µA max IQ, THD+N of 0.006%, and SOT23-5 package compatibility with space-constrained portable systems.
Technical Context
The OPA344NA/3KG4 employs a complementary differential input stage (N- and P-channel pairs) to achieve rail-to-rail common-mode input range extending 300 mV beyond both supply rails. Its class AB output stage enables true rail-to-rail output swing - critical for maximizing dynamic range in low-voltage ADC driver and audio buffer roles.
Designed for unity-gain stability, it operates across –40°C to +85°C with open-loop gain ≥104 dB (RL = 100 kΩ), CMRR ≥76 dB over full common-mode range, and PSRR ≥30 µV/V - supporting precision DC-coupled signal paths without external compensation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-Bandwidth Product | 1 MHz - supports stable unity-gain buffering of signals up to ~100 kHz with minimal phase lag. |
| Slew Rate | 0.8 V/µs - enables clean 100 kHz, 2 VPP sine wave reproduction without distortion. |
| Input Offset Voltage | ±1 mV max - ensures ≤10 mV error in 10 V full-scale instrumentation amplifiers. |
| Quiescent Current | 150 µA typ / 250 µA max - allows battery-powered operation >1 year on a CR2032 cell in always-on sensor nodes. |
| Output Swing | Within 1 mV of rails (RL = 100 kΩ) - preserves >99.9% of available voltage headroom for 3.3 V ADC reference tracking. |
| THD + Noise | 0.006% at 1 kHz - meets CD-quality audio line-driver requirements with no audible artifacts. |
| Supply Voltage Range | 2.7 V to 5.5 V - interoperable with Li-ion, USB, and logic-supply domains without level-shifting. |
Pinout & Package
SOT23-5 surface-mount package (5-pin, 2.9 mm × 1.6 mm, 1.45 mm height) with thermal resistance θJA = 200°C/W. RoHS-compliant, green finish, MSL Level-2-260°C-1 year.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (V–) | Negative supply / ground reference | Connect to system ground or negative rail; supports single-supply operation down to 2.7 V. |
| 2 (–In) | Inverting input | Differential node accepting signals from –0.3 V to (V+) + 0.3 V; rail-to-rail input stage active across full range. |
| 3 (Out) | Amplifier output | Delivers rail-to-rail swing (within 1 mV) into ≥100 kΩ loads; drives capacitive loads ≤250 pF directly. |
| 4 (V+) | Positive supply | Accepts 2.7–5.5 V; bypass with 0.01 µF ceramic capacitor to minimize supply noise coupling. |
| 5 (+In) | Non-inverting input | High-impedance (1013 Ω || 3 pF) input for precision biasing or sensor interface; matched to –In for low offset. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input and output | Enables full-scale signal utilization in 3.3 V systems - eliminates need for dual supplies or level shifters in ADC driver stages. |
| 150 µA typical quiescent current | Reduces power budget by >5× vs. standard rail-to-rail op amps - critical for coin-cell-powered IoT endpoints. |
| Unity-gain stable | Eliminates external compensation components in buffer, active filter, and I/V conversion circuits - simplifies layout and BOM. |
| 0.006% THD+N at 1 kHz | Supports high-fidelity audio signal chains without post-amplification filtering - suitable for electret microphone preamps. |
| ±10 pA max input bias current | Minimizes voltage error across high-impedance sources (e.g., pH sensors, photodiode transimpedance feedback networks). |
Applications
| PCMCIA Card Signal Conditioning | Data Acquisition Front-End |
|---|---|
Use Scenario: Amplifying and buffering analog sensor outputs in compact PCMCIA-format data loggers. IC Role / Device Role / Timing Role: Unity-gain buffer driving ADS7822 12-bit sampling ADC input capacitance while rejecting charge injection. Use Value: Rail-to-rail swing preserves full 0–VREF ADC range; 150 µA IQ extends battery life in portable field instruments. |
Use Scenario: Low-noise signal conditioning for thermocouple or strain gauge bridges in industrial PLC modules. IC Role / Device Role / Timing Role: Precision instrumentation amplifier input stage with <1 mV offset and 1013 Ω input impedance. Use Value: Sub-µV/°C drift and 8 µVRMS (0.1–50 kHz) noise enable <0.1% measurement accuracy without calibration. |
| Audio Processing Channel | Active Filter Stage |
Use Scenario: Electret microphone preamplifier and bandpass filter in voice-controlled edge devices. IC Role / Device Role / Timing Role: High-input-impedance, low-THD+N gain stage (G = 100) before ADC digitization. Use Value: 0.006% THD+N and rail-to-rail output ensure speech clarity; 2.7 V operation matches Li-ion battery discharge curve. |
Use Scenario: Second-order Sallen-Key low-pass filter in communication receiver baseband path. IC Role / Device Role / Timing Role: Unity-gain stable amplifier implementing filter transfer function with minimal phase distortion. Use Value: 1 MHz GBW supports cutoff frequencies up to 100 kHz; low IQ reduces thermal drift in multi-stage filters. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA344NA/250 | Same silicon, identical specs, but supplied in 250-unit tape-and-reel instead of 3,000-unit reel. | No functional difference; suited for prototyping or low-volume production runs. | Select when evaluating performance or building small-batch test units - avoids overstocking. |
| MCP6001T-E/OT | 1 MHz GBW, 100 µA IQ, but only rail-to-rail output (not input); 2 mV max VOS; 100 pA IB. | Limited common-mode range (VCM = V– to V+ – 0.3 V) restricts use in true rail-to-rail input scenarios like sensor zero-crossing detection. | Choose for ultra-low-power cost-sensitive designs where input rail-to-rail is not required - e.g., simple voltage followers with mid-supply bias. |
Compared with OPA344NA/3KG4, the OPA344NA/250 offers identical electrical performance in smaller packaging volume, while the MCP6001T-E/OT trades rail-to-rail input capability and lower offset for reduced cost and marginally lower quiescent current - making it viable only where input voltage range constraints permit.
Availability
OPA344NA/3KG4 is available at Aetrix Electronics and suitable for PCMCIA card design, portable data acquisition systems, and battery-powered audio processing requiring stable component supply, consistent parametric performance, and long-term manufacturability.
Supply support for OPA344NA/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 delivering analog and embedded processing solutions, with over 90 years of innovation in precision amplifiers and low-power signal chain ICs.
The OPA344NA/3KG4 belongs to TI's MicroAmplifier™ series - engineered specifically for miniature, single-supply, rail-to-rail precision applications including portable instrumentation, medical sensors, and energy-harvesting interfaces.
FAQ
What is the operating temperature range for the OPA344NA/3KG4?
The OPA344NA/3KG4 is specified for operation from –40°C to +85°C, with extended operating range up to +125°C. Its parameters - including input offset voltage, CMRR, and quiescent current - are guaranteed across the full –40°C to +85°C industrial range per the SBOS107A datasheet. Thermal resistance (θJA = 200°C/W) supports reliable SOT23-5 mounting on standard FR-4 PCBs.
Is the OPA344NA/3KG4 unity-gain stable?
Yes, the OPA344NA/3KG4 is explicitly designed and tested for unity-gain stability. Unlike the OPA345 family, it does not require minimum gain for stability and can be used in buffer, voltage follower, and active filter configurations without external compensation. This is confirmed in the Applications Information section and verified by its open-loop gain/phase plot showing >45° phase margin at unity gain.
What is the maximum capacitive load the OPA344NA/3KG4 can drive in unity-gain configuration?
The OPA344NA/3KG4 can directly drive up to 250 pF of pure capacitive load in unity-gain configuration while maintaining stability and <1% overshoot. For loads exceeding this, a 10–20 Ω series resistor between the output and capacitive load (as shown in Figure 5 of SBOS107A) restores stability without degrading DC accuracy - provided no significant resistive load is present in parallel.
Does the OPA344NA/3KG4 support rail-to-rail input voltage range?
Yes - the OPA344NA/3KG4 features a true rail-to-rail input stage with common-mode voltage range from (V–) –0.3 V to (V+) + 0.3 V. This is achieved via complementary N- and P-channel input pairs, enabling accurate amplification of signals near both supply rails - essential for interfacing with low-voltage sensors and single-supply ADCs.
What package type and marking code does the OPA344NA/3KG4 use?
The OPA344NA/3KG4 uses the SOT23-5 package (package drawing DBV) with device marking "B44" laser-etched on the top surface. It is supplied in 3,000-unit tape-and-reel format (3K), RoHS-compliant, green finish, and moisture sensitivity level (MSL) 2 - requiring bake or dry-pack handling if exposed to ambient >60% RH for >1 year.
OPA344NA/3KG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- MicroAmplifier™
- Package/Case:
- SC-74A, SOT-753
- 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:
- 0.8V/µs
- Gain Bandwidth Product:
- 1 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 0.2 pA
- Voltage - Input Offset:
- 200 µV
- Current - Supply:
- 150µA
- Current - Output / Channel:
- 15 mA
- Voltage - Supply Span (Min):
- 2.5 V
- Voltage - Supply Span (Max):
- 5.5 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
OPA344NA/3KG4 FAQ
1.How can I place an order for OPA344NA/3KG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA344NA/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 OPA344NA/3KG4 reliable?
The price and inventory of OPA344NA/3KG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA344NA/3KG4 is usually 5 days.
3.What payment methods are accepted for OPA344NA/3KG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA344NA/3KG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA344NA/3KG4?
OPA344NA/3KG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA344NA/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 OPA344NA/3KG4?
For technical support, including OPA344NA/3KG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA344NA/3KG4 requirements.
6.How does Aetrix verify that OPA344NA/3KG4 is sourced from the original manufacturer or authorized distributors?
All OPA344NA/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 OPA344NA/3KG4 meets industry standards.
7.What is the process for return or replacement of OPA344NA/3KG4?
All OPA344NA/3KG4 units undergo pre-shipment inspection (PSI). If there is an issue with OPA344NA/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 OPA344NA/3KG4 part is unused and in its original packaging.
Return procedure for OPA344NA/3KG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
OPA344NA/3KG4 Tags
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