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Texas Instruments OPA340NA/3KG4
- Part No.:
- OPA340NA/3KG4
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SC-74A, SOT-753
- Datasheet:
-
OPA340NA/3KG4.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,285
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Product details
Overview
OPA340NA/3KG4 from Texas Instruments is a single-supply, rail-to-rail input/output CMOS operational amplifier optimized for driving sampling A/D converters such as the ADS7816. It delivers 5.5 MHz gain-bandwidth, 6 V/µs slew rate, and output swing within 1 mV of rails under 100-kΩ load - enabling high-fidelity signal conditioning in 0–5 V data acquisition systems.
For engineers reviewing the OPA340NA/3KG4 datasheet, OPA340NA/3KG4 pinout, OPA340NA/3KG4 application, or OPA340NA/3KG4 equivalent, key selection criteria include rail-to-rail input range extending 500 mV beyond supply rails, low 750 µA quiescent current per channel, THD+N of 0.0007% at 1 kHz, and compatibility with micro-power 12-bit ADC interfaces like ADS7816.
Technical Context
The OPA340NA/3KG4 uses a complementary N/P-channel input stage to achieve rail-to-rail common-mode input range (–0.3 V to V+ + 0.3 V), with laser trimming minimizing offset discontinuity across the transition region. Its class AB output stage enables millivolt-level rail approach under light loads while maintaining stability with up to 1000 pF capacitive load in unity-gain configuration.
Designed for single-supply operation from 2.5 V to 5.5 V, it supports –40°C to 85°C industrial temperature range and features 25 nV/√Hz input voltage noise density, 3 fA/√Hz current noise density, and 124 dB open-loop gain (typ.) - making it suitable for precision, low-voltage, low-noise analog front-ends.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-bandwidth product | 5.5 MHz - supports stable unity-gain operation and closed-loop bandwidth up to ~5 MHz for sensor buffering or filter stages. |
| Slew rate | 6 V/µs - enables clean 2-V step response in ≤1 µs (0.1% settling), critical for driving sampling ADC inputs without distortion. |
| Input offset voltage | ±150 µV (max) - ensures <1 LSB error when driving 12-bit ADCs with 5 V full-scale range (LSB = 1.22 mV). |
| Quiescent current | 750 µA per channel - allows battery-powered or energy-constrained designs (e.g., portable data loggers) to maintain high AC performance. |
| Output voltage swing | Within 1 mV of rails (RL ≥ 100 kΩ) - maximizes dynamic range in 2.7–5.5 V single-supply systems, especially with rail-referenced ADCs like ADS7816. |
| THD + Noise | 0.0007% at 1 kHz - preserves signal integrity in audio and precision measurement paths where harmonic distortion must be sub-100 ppm. |
| Input voltage noise | 25 nV/√Hz at 1 kHz - limits contribution to total system noise floor in high-gain, low-level sensor amplification stages. |
Pinout & Package
OPA340NA/3KG4 is packaged in an 8-pin SOIC (D package), 4.90 mm × 3.91 mm body size, with exposed pad not present. Pin functions are electrically identical to the OPA340 D variant.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT | Amplifier output - drives ADC input, active filters, or I/V conversion nodes; capable of sourcing/sinking ±50 mA short-circuit current. |
| 2 | –IN | Inverting input - used in inverting configurations or feedback networks; input bias current ≤10 pA minimizes resistor-induced offset errors. |
| 3 | +IN | Noninverting input - accepts rail-to-rail signals from sensors or DACs; common-mode range extends 500 mV beyond supply rails. |
| 4 | V– | Negative supply terminal - typically connected to ground in single-supply systems; serves as reference for input and output voltage ranges. |
| 5 | NC | No internal connection - must be left floating or tied to ground; no electrical function or internal bond wire. |
| 6 | NC | No internal connection - same as Pin 5; unused in this SOIC variant. |
| 7 | V+ | Positive supply terminal - accepts 2.5–5.5 V; requires 0.1 µF ceramic bypass capacitor to ground for high-frequency stability. |
| 8 | NC | No internal connection - same as Pins 5 and 6; no internal circuitry or bond. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input | Common-mode range from –0.3 V to V+ + 0.3 V enables direct interfacing with unbuffered DAC outputs or ground-referenced sensors without level-shifting. |
| Rail-to-rail output | Swings to within 1 mV of supply rails under 100-kΩ load - preserves full ADC input range and eliminates headroom loss in low-voltage systems. |
| Low quiescent current | 750 µA per channel at 5 V allows integration into always-on monitoring circuits without compromising battery life or thermal budget. |
| High-speed precision | 5.5 MHz GBW + 6 V/µs SR + 0.0007% THD+N supports accurate amplification of fast, low-distortion waveforms in data acquisition and audio paths. |
| CMOS input stage | Input bias current ≤10 pA reduces voltage drop across high-value feedback resistors, enabling high-impedance sensor interfaces with minimal offset drift. |
Applications
| Driving Sampling ADCs | Audio Signal Conditioning |
|---|---|
|
Use Scenario: Buffering and gain-setting for 12-bit, 200-kSPS ADS7816 in portable instrumentation. IC Role / Device Role / Timing Role: Front-end driver isolating ADC input capacitance, absorbing charge injection, and providing low-impedance source for sampling aperture. Use Value: Enables full-scale 0–5 V input range with <1 LSB gain/offset error and <0.1% settling in <1 µs - directly supporting micro-power, high-resolution data capture. |
Use Scenario: Noninverting preamplifier in battery-powered voice recorder with MEMS microphone input. IC Role / Device Role / Timing Role: Low-noise, low-distortion gain stage before anti-alias filtering and ADC digitization. Use Value: 25 nV/√Hz noise and 0.0007% THD+N preserve speech fidelity; 750 µA IQ extends recording time without sacrificing SNR. |
| Process Sensor Interfaces | Active Filter Stages |
|
Use Scenario: Amplifying low-level mV-range output from RTD or thermocouple signal conditioners in industrial PLC modules. IC Role / Device Role / Timing Role: Precision DC-coupled gain block with rail-to-rail input accommodating negative cold-junction compensation voltages. Use Value: ±150 µV max offset and ±2.5 µV/°C drift ensure <0.1°C measurement accuracy over –40°C to 85°C ambient without recalibration. |
Use Scenario: Second-order Sallen-Key low-pass filter (fc = 10 kHz) in medical ECG front-end to suppress RF interference. IC Role / Device Role / Timing Role: Unity-gain stable op-amp implementing filter transfer function with minimal phase shift and group delay variation. Use Value: 5.5 MHz GBW provides >500× fc margin, ensuring filter Q and cutoff accuracy remain stable across process/voltage/temperature. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA333AIDBVR | Zero-drift architecture; 0.02 µV/°C offset drift vs. OPA340NA/3KG4's ±2.5 µV/°C; higher 350 µA IQ but lower 17 µV max offset. | Better for DC-precision, low-drift applications (e.g., weigh scales); less optimal for wideband audio due to 350 kHz GBW. | Select OPA333AIDBVR when long-term DC stability dominates over AC speed; retain OPA340NA/3KG4 for bandwidth-sensitive ADC driving. |
| MCP6001T-E/OT | Lower 100 kHz GBW and 0.06 V/µs slew rate; 100 µA IQ; rail-to-rail I/O but only 60 dB CMRR min vs. 80 dB for OPA340NA/3KG4. | Suitable for cost-sensitive, low-speed sensor buffers (e.g., temperature monitoring), not for 12-bit ADC interface or audio. | Choose MCP6001T-E/OT only in non-critical, low-bandwidth roles where power savings outweigh precision and speed requirements. |
Compared with OPA333AIDBVR and MCP6001T-E/OT, the OPA340NA/3KG4 uniquely balances 5.5 MHz bandwidth, rail-to-rail operation, and 750 µA quiescent current - making it the preferred choice for medium-speed, precision, single-supply signal chains where both AC fidelity and DC accuracy matter.
Availability
OPA340NA/3KG4 is available at Aetrix Electronics and suitable for data acquisition, portable instrumentation, and industrial sensor signal conditioning requiring stable component supply and guaranteed long-term availability.
Supply support for OPA340NA/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 company specializing in analog and embedded processing technologies, with leadership in precision amplifiers, data converters, and power management ICs.
The OPA340 series belongs to TI's MicroAmplifier™ line, designed specifically for low-voltage, single-supply applications demanding rail-to-rail input/output, low power, and high-speed precision - particularly in ADC driver, audio, and sensor interface roles.
FAQ
What is the maximum supply voltage for OPA340NA/3KG4?
The OPA340NA/3KG4 supports an absolute maximum supply voltage of 5.5 V across V+ and V– terminals. Operation above this risks permanent damage. The recommended operating range is 2.7 V to 5 V, though functional operation is verified down to 2.5 V. Always observe the 0.1 µF ceramic bypass capacitor requirement on V+ for stability.
Does OPA340NA/3KG4 support rail-to-rail input with a 3.3 V supply?
Yes - the OPA340NA/3KG4 maintains rail-to-rail input capability from –0.3 V to V+ + 0.3 V, so with a 3.3 V supply, its input common-mode range spans –0.3 V to 3.6 V. This allows direct interfacing with 3.3 V logic, DAC outputs, or grounded sensors without external level-shifting circuitry.
Can OPA340NA/3KG4 drive the ADS7816 ADC directly?
Yes - the OPA340NA/3KG4 is explicitly characterized and applied in noninverting and inverting configurations driving the ADS7816. Its low output impedance, fast settling (<1 µs), and rail-to-rail swing ensure clean, full-scale 0–5 V input to the ADC while absorbing charge injection from the sampling capacitor.
What is the thermal resistance (RθJA) of OPA340NA/3KG4 in SOIC package?
The OPA340NA/3KG4 in 8-pin SOIC (D package) has a junction-to-ambient thermal resistance (RθJA) of 142 °C/W, as specified in the TI datasheet SBOS073C. This value assumes standard JEDEC 2-layer board conditions; actual PCB layout and copper area will affect real-world thermal performance.
Is OPA340NA/3KG4 pin-compatible with other OPA340 variants?
OPA340NA/3KG4 (SOIC-8) shares identical pinout with the OPA340 P (PDIP-8) and OPA340 D (SOIC-8) variants. However, it is not pin-compatible with the 5-pin SOT-23 OPA340DBV - which omits NC pins and rearranges V+, OUT, and –IN positions. Always verify package-specific pin mapping before PCB layout.
OPA340NA/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:
- 6V/µs
- Gain Bandwidth Product:
- 5.5 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 0.2 pA
- Voltage - Input Offset:
- 150 µV
- Current - Supply:
- 750µA
- Current - Output / Channel:
- 50 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
OPA340NA/3KG4 FAQ
1.How can I place an order for OPA340NA/3KG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA340NA/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 OPA340NA/3KG4 reliable?
The price and inventory of OPA340NA/3KG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA340NA/3KG4 is usually 5 days.
3.What payment methods are accepted for OPA340NA/3KG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA340NA/3KG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA340NA/3KG4?
OPA340NA/3KG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA340NA/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 OPA340NA/3KG4?
For technical support, including OPA340NA/3KG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA340NA/3KG4 requirements.
6.How does Aetrix verify that OPA340NA/3KG4 is sourced from the original manufacturer or authorized distributors?
All OPA340NA/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 OPA340NA/3KG4 meets industry standards.
7.What is the process for return or replacement of OPA340NA/3KG4?
All OPA340NA/3KG4 units undergo pre-shipment inspection (PSI). If there is an issue with OPA340NA/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 OPA340NA/3KG4 part is unused and in its original packaging.
Return procedure for OPA340NA/3KG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
OPA340NA/3KG4 Tags
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LM358DT
STMicroelectronics
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LM358DR
Texas Instruments
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LM2904DR
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LM358ADR
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MCP6006T-E/OT
Microchip Technology
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MCP6006UT-E/OT
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LM2902DR
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LM358P
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