My Inquiry
My Account
Texas Instruments OPA340NA/3K
- Part No.:
- OPA340NA/3K
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SC-74A, SOT-753
- Datasheet:
-
OPA340NA/3K.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:5,801
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
OPA340NA/3K 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/3K datasheet, OPA340NA/3K pinout, OPA340NA/3K application, or OPA340NA/3K equivalent, key selection criteria include rail-to-rail I/O performance at 2.7–5.5 V supply, low 750 µA quiescent current per channel, THD+N of 0.0007% at 1 kHz, and verified drive capability into ADC input capacitance with minimal settling error.
Technical Context
The OPA340NA/3K uses a complementary CMOS input stage (N- and P-channel pairs) to achieve rail-to-rail input common-mode range extending 500 mV beyond both supply rails. Its class AB output stage enables true rail-to-rail output swing - within 1 mV at light loads and ≤40 mV at 2-kΩ load - while maintaining >106 dB open-loop gain.
It is unity-gain stable and specified for operation from –40°C to 85°C, with electrical characteristics guaranteed across 2.7–5.5 V supply. Input bias current is ultra-low (±0.2 pA typ), and input offset voltage is laser-trimmed to ±150 µV (typ), supporting precision DC-coupled signal paths in low-power embedded systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-bandwidth product | 5.5 MHz - supports stable closed-loop gain ≥10 up to ~500 kHz, suitable for anti-aliasing filter interfaces and medium-speed ADC drivers. |
| Slew rate | 6 V/µs - ensures <1.6 µs settling to 0.01% for 2-V step, critical for accurate sampling of fast transients before ADC aperture time. |
| Input offset voltage | ±150 µV (typ) - contributes <0.003% full-scale error in 5-V-range systems, minimizing calibration burden in precision data acquisition. |
| Quiescent current | 750 µA per channel - enables battery-powered operation with >1-year runtime in micro-power sensor nodes using 200-mAh coin cells. |
| Output voltage swing | Within 1 mV of rails (100-kΩ load) - maximizes dynamic range in single-supply 0–5 V systems, preserving >99.9% of ADC input span. |
| THD + noise | 0.0007% at 1 kHz - meets audio-grade linearity requirements and avoids harmonic folding into ADC Nyquist band. |
| Input bias current | ±0.2 pA (typ) - permits use with high-impedance sources (e.g., piezoelectric sensors, pH electrodes) without significant voltage drop or drift. |
Pinout & Package
The OPA340NA/3K is packaged in a 5-pin SOT-23 (DBV) surface-mount package with 3.00 mm × 3.00 mm body size, optimized for space-constrained PCB layouts in portable instrumentation and sensor modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - OUT | Amplifier output | Delivers rail-to-rail buffered signal; requires 0.01-µF ceramic bypass to V+ for stability when driving capacitive loads like ADC inputs. |
| 2 - V− | Negative supply | Connected to ground in single-supply operation; establishes reference for rail-to-rail input stage and sets lower common-mode limit (–0.3 V min). |
| 3 - +IN | Noninverting input | High-impedance node (10¹³ Ω || 3 pF); accepts signals from –0.3 V to (V+) + 0.3 V - enables direct interfacing with bipolar sensor outputs. |
| 4 - –IN | Inverting input | Differential input node; used in inverting configurations or feedback networks; shares same rail-to-rail common-mode range as +IN. |
| 5 - V+ | Positive supply | Accepts 2.7–5.5 V; internal regulation ensures consistent biasing; must be decoupled locally to suppress supply-induced noise coupling into analog signal path. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input | Common-mode range extends 500 mV beyond both supply rails - eliminates level-shifting circuits when interfacing with sensors or DACs operating near supply limits. |
| Rail-to-rail output | Swings to within 1 mV of V+ and V− under light load - preserves full ADC input voltage range and improves SNR in 12-bit+ systems. |
| Low quiescent current | 750 µA per channel at 5 V - reduces thermal load and extends battery life in always-on IoT edge nodes without sacrificing bandwidth. |
| High-speed precision | 5.5 MHz GBW + 6 V/µs SR + 0.0007% THD+N - enables clean amplification of audio-band and transient-rich sensor signals prior to digitization. |
| Ultra-low input bias current | ±0.2 pA typical - prevents loading errors in high-Z source applications (e.g., photodiode transimpedance, electrochemical sensors) without guard traces or active guarding. |
Applications
| Driving Sampling ADCs | Audio Signal Conditioning |
|---|---|
Use Scenario: Buffering and gain-setting for 12-bit ADS7816 in portable data loggers with 0–5 V input range and micro-power constraints. IC Role / Device Role / Timing Role: Acts as unity-gain or noninverting buffer between sensor front-end and ADC sample-and-hold input, absorbing charge injection and isolating source impedance. Use Value: Enables <1.6 µs 0.01% settling into 100-pF ADC input capacitance, preventing missing codes and reducing post-processing correction overhead. | Use Scenario: Low-noise preamplification of electret microphone output in battery-powered voice recorders. IC Role / Device Role / Timing Role: First-stage gain amplifier with AC-coupled input and rail-to-rail output driving codec ADC, operating from single 3.3 V supply. Use Value: Delivers 0.0007% THD+N at 1 kHz and 25 nV/√Hz input noise - preserves speech intelligibility and minimizes harmonic distortion masking. |
| Process Sensor Interfaces | Active Filter Stages |
Use Scenario: I/V conversion and filtering for 4–20 mA industrial current-loop transmitters feeding PLC analog inputs. IC Role / Device Role / Timing Role: Precision transimpedance amplifier with rail-to-rail output swing into 2.5 V reference-based ADC, rejecting common-mode noise on long cables. Use Value: ±0.2 pA input bias current prevents offset drift from leakage across 10-MΩ feedback resistors, ensuring <0.1% full-scale accuracy over temperature. | Use Scenario: Second-order Sallen-Key low-pass filter (cutoff = 20 kHz) in medical ECG front-end to suppress RF interference while preserving QRS complex fidelity. IC Role / Device Role / Timing Role: Active filter op-amp with unity-gain stability and low output impedance to drive downstream ADC input capacitance without peaking. Use Value: 5.5 MHz GBW ensures flat group delay and <0.1 dB passband ripple up to 10 kHz, critical for diagnostic waveform integrity. |
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; max offset drift 0.1 µV/°C vs OPA340NA/3K's ±2.5 µV/°C; higher 350-kHz GBW but lower 1.6-V/µs slew rate. | Better for DC-precision applications (e.g., weigh scales, thermopile amplifiers); less suitable for fast transient capture or audio. | Select OPA333AIDBVR when long-term DC stability dominates over speed; retain OPA340NA/3K for ADC driver or audio roles requiring 6 V/µs slew. |
| MCP6001T-E/OT | Lower 1-MHz GBW and 0.6 V/µs slew rate; higher 100-µA IQ; rail-to-rail I/O but only 70 dB CMRR vs OPA340NA/3K's 80–92 dB. | Targeted at cost-sensitive, low-speed control loops (e.g., fan speed, LED dimming); insufficient for 12-bit ADC driving at >10-kSPS. | Choose MCP6001T-E/OT for simple buffering where bandwidth <100 kHz suffices; OPA340NA/3K remains preferred for sampling accuracy-critical signal chains. |
Compared with OPA333AIDBVR and MCP6001T-E/OT, the OPA340NA/3K uniquely balances 5.5 MHz bandwidth, 6 V/µs slew rate, rail-to-rail I/O, and 750 µA quiescent current - making it the optimal choice for medium-speed data acquisition where both speed and power efficiency are constrained.
Availability
OPA340NA/3K is available at Aetrix Electronics and suitable for data acquisition, portable instrumentation, and audio signal conditioning requiring stable component supply and guaranteed long-term manufacturability.
Supply support for OPA340NA/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 and embedded processing technologies, with decades of expertise in precision amplifiers and data converter interface solutions.
The OPA340 series belongs to TI's MicroAmplifier™ portfolio, designed specifically for low-voltage, single-supply signal conditioning in space- and power-constrained systems - especially ADC drivers, sensor interfaces, and portable audio.
FAQ
What is the maximum supply voltage rating for the OPA340NA/3K?
The OPA340NA/3K has an absolute maximum supply voltage of 5.5 V. It operates reliably across a recommended range of 2.7 V to 5.5 V, with full specifications guaranteed from 2.7 V to 5 V. Operation below 2.7 V is possible down to 2.5 V but may result in degraded parameters such as reduced output swing or increased offset drift - always verify performance in final design conditions for OPA340NA/3K.
Does the OPA340NA/3K support rail-to-rail input with signals below ground?
Yes, the OPA340NA/3K supports rail-to-rail input with common-mode voltages as low as –0.3 V (500 mV below V−, which is typically ground). This allows direct interfacing with bipolar signals or sensors whose outputs dip slightly negative - a key advantage over conventional op-amps that require level-shifting. The OPA340NA/3K maintains specified performance across this extended range when powered from 2.7–5.5 V.
Can the OPA340NA/3K drive the input capacitance of the ADS7816 ADC without external compensation?
Yes, the OPA340NA/3K is explicitly characterized driving the ADS7816 in both noninverting and inverting configurations, as shown in TI's SBOS073C datasheet Figure 26 and Figure 27. With proper 0.01-µF local V+ bypassing and layout attention, it settles to 0.01% in 1.6 µs into the ADS7816's input capacitance - no external RC snubber or isolation resistor is required for standard operation of OPA340NA/3K.
What is the typical input bias current of the OPA340NA/3K, and why does it matter?
The typical input bias current of the OPA340NA/3K is ±0.2 pA - among the lowest for CMOS op-amps in its class. This ultra-low value prevents voltage errors across high-value feedback or source impedances (e.g., >1 MΩ), making OPA340NA/3K ideal for photodiode transimpedance amps, pH probe buffers, or high-impedance sensor signal chains where even nanoamp-level leakage would degrade accuracy.
Is the OPA340NA/3K unity-gain stable, and what capacitive load can it drive?
Yes, the OPA340NA/3K is unity-gain stable and can drive up to ~1000 pF of pure capacitive load in unity-gain configuration without oscillation. For heavier loads or inverting configurations, stability margins improve with higher closed-loop gain. TI recommends adding a 10–20 Ω series resistor at the output if ringing occurs - a proven method validated in OPA340NA/3K application notes for ADC interface designs.
OPA340NA/3K Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- MicroAmplifier™
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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/3K FAQ
1.How can I place an order for OPA340NA/3K through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA340NA/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 OPA340NA/3K reliable?
The price and inventory of OPA340NA/3K are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA340NA/3K is usually 5 days.
3.What payment methods are accepted for OPA340NA/3K?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA340NA/3K transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA340NA/3K?
OPA340NA/3K orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA340NA/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 OPA340NA/3K?
For technical support, including OPA340NA/3K datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA340NA/3K requirements.
6.How does Aetrix verify that OPA340NA/3K is sourced from the original manufacturer or authorized distributors?
All OPA340NA/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 OPA340NA/3K meets industry standards.
7.What is the process for return or replacement of OPA340NA/3K?
All OPA340NA/3K units undergo pre-shipment inspection (PSI). If there is an issue with OPA340NA/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 OPA340NA/3K part is unused and in its original packaging.
Return procedure for OPA340NA/3K:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
OPA340NA/3K 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…
