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Texas Instruments OPA340UA
- Part No.:
- OPA340UA
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA340UA.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:911
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Product details
Overview
OPA340UA 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 OPA340UA datasheet, OPA340UA pinout, OPA340UA application, or OPA340UA 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 requiring minimal settling time and charge injection suppression.
Technical Context
The OPA340UA uses a complementary CMOS input stage (N- and P-channel parallel pairs) to achieve rail-to-rail input operation across –0.3 V to (V+) + 0.3 V, with a defined 400-mV transition region where both stages conduct. Its class AB output stage enables rail-to-rail output swing while maintaining >106 dB open-loop gain at 100-kΩ load.
It is unity-gain stable and specified over 2.7–5.5 V supply and –40°C to +85°C ambient, with thermal metrics including RθJA = 142°C/W (SOIC-8) and robust capacitive load drive up to 1000 pF in unity-gain configuration - critical for direct connection to switched-capacitor ADC inputs like those in the ADS7816.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-bandwidth product | 5.5 MHz - supports stable closed-loop gain ≥10 up to ~550 kHz, suitable for anti-aliasing filter design and medium-speed ADC buffering. |
| Slew rate | 6 V/µs - ensures ≤1 µs 0.1% settling for 2-V step, minimizing distortion during fast ADC sample-and-hold transitions. |
| Input offset voltage | ±150 µV (typ) - enables <1 LSB error when driving 12-bit ADCs with 5 V full-scale range (LSB = 1.22 mV). |
| THD+N | 0.0007% at 1 kHz - preserves audio and sensor signal integrity in precision acquisition paths without post-processing correction. |
| Quiescent current | 750 µA per amplifier - allows battery-powered or energy-constrained designs (e.g., PCMCIA cards, portable instrumentation) to maintain performance without excessive power penalty. |
| Rail-to-rail output swing | Within 1 mV of rails (100-kΩ load) - maximizes dynamic range in single-supply 5 V systems, delivering near-full-scale analog input to ADCs like ADS7816. |
| Common-mode input range | –0.3 V to (V+) + 0.3 V - accepts ground-referenced or slightly negative transducer signals without level-shifting circuitry. |
Pinout & Package
OPA340UA 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 validated per TI SBOS073C Rev C.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Output | Amplifier output node; drives ADC input or filter network directly; requires 0.1 µF bypass capacitor to V+ if used in high-impedance feedback configurations. |
| 2 | Inverting input | Feedback path connection point; sensitive to stray capacitance - layout must minimize trace length and avoid routing near noisy digital lines. |
| 3 | Noninverting input | Signal input node; accepts rail-to-rail common-mode voltages; input bias current ≤10 pA enables high-Z sensor interfacing without significant DC error. |
| 4 | Negative supply (GND) | Reference return for single-supply operation; must be low-impedance and star-connected to ADC ground to prevent ground bounce coupling into analog path. |
| 5 | No connect | Internally unconnected; must remain floating - no tie to GND, V+, or signal traces to avoid parasitic coupling or ESD path disruption. |
| 6 | No connect | Internally unconnected; same handling as Pin 5 - PCB footprint must isolate this pad from all planes and traces. |
| 7 | Positive supply (V+) | 5 V nominal supply input; requires local 0.1 µF ceramic decoupling to GND within 5 mm to suppress high-frequency noise affecting PSRR and stability. |
| 8 | No connect | Internally unconnected; identical isolation requirements as Pins 5 and 6; no solder mask opening or via allowed. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input stage | Extends common-mode range to –0.3 V and (V+) + 0.3 V using parallel N/P-channel differential pairs - eliminates need for external level shifters in 0–5 V sensor front-ends. |
| Rail-to-rail output stage | Class AB architecture delivers output within 1 mV of supply rails at light loads - preserves full 5 V ADC input range without headroom loss. |
| Low THD+N (0.0007%) | Minimizes harmonic contamination in audio and communication signal chains, enabling direct use in high-fidelity microphone preamps or tone generators. |
| MicroSize SOIC-8 package | 4.90 mm × 3.91 mm footprint supports dense PCB layouts in space-constrained applications like handheld test equipment and embedded data loggers. |
| Single-supply operation down to 2.7 V | Enables interoperability with Li-ion battery systems (3.0–4.2 V) and 3.3 V logic domains without level translation or dual supplies. |
Applications
| Driving Sampling ADCs | Audio Signal Conditioning |
|---|---|
Use Scenario: Buffering and gain-setting for 12-bit ADS7816 in portable data acquisition systems with 0–5 V input range and serial interface. IC Role / Device Role / Timing Role: Signal conditioner and charge injector compensator placed immediately before ADC sample-and-hold input to absorb switching transients. Use Value: 1 µs 0.1% settling and rail-to-rail swing ensure <0.01% measurement error at 100 kSPS, while 750 µA IQ extends battery life in field-deployable sensors. |
Use Scenario: Low-noise preamplification of electret microphone outputs in voice-enabled IoT edge nodes operating from 3.3 V supply. IC Role / Device Role / Timing Role: High-fidelity voltage amplifier with DC-coupled input and AC-coupled output, configured for 20–20 kHz bandwidth. Use Value: 25 nV/√Hz input voltage noise and 0.0007% THD+N preserve speech intelligibility and SNR >95 dB, meeting IEC 61672 Class 2 requirements. |
| PCMCIA Card Analog Front-End | Process Control Loop Transmitter |
Use Scenario: Signal conditioning for analog I/O on legacy PCMCIA-based industrial controllers with tight board area and thermal constraints. IC Role / Device Role / Timing Role: Rail-to-rail I/V converter and filter driver for 4–20 mA loop receivers, interfacing to 12-bit SAR ADCs. Use Value: 5.5 MHz GBW and 6 V/µs slew rate support fast loop response (<10 µs step recovery), while SOIC-8 footprint fits standard PCMCIA card edge connectors. |
Use Scenario: Isolated analog output stage converting DAC voltage to 4–20 mA current for valve position control in hazardous-area process instrumentation. IC Role / Device Role / Timing Role: Precision current source amplifier with Kelvin-sense feedback, operating from 24 V loop supply with 5 V internal regulation. Use Value: ±150 µV offset and <2.5 µV/°C drift ensure <0.1% F.S. accuracy over –40°C to +85°C ambient, meeting ISA S50.1 compliance for safety-critical loops. |
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; 0.1 µV/°C max offset drift vs. OPA340UA's ±2.5 µV/°C; higher 350 µA IQ but lower 10 µV max VOS. | Better for DC-critical applications (e.g., precision weigh scales); less optimal for wideband audio due to chopper noise peaks at 10 kHz. | Select OPA333AIDBVR when long-term DC stability outweighs AC performance; retain OPA340UA for bandwidth-sensitive ADC driving. |
| MCP6001T-I/OT | Lower 100 kHz GBW and 0.6 V/µs slew rate; 100 µA IQ; rail-to-rail I/O but only 1.2 V headroom at 5 V supply for full output swing. | Suitable for low-speed sensor buffering (e.g., temperature, humidity) but cannot meet ADS7816 settling or THD requirements. | Choose MCP6001T-I/OT for ultra-low-power sub-100 kSPS systems where cost and IQ dominate; OPA340UA remains preferred for 100 kSPS+ data acquisition. |
Compared with OPA333AIDBVR and MCP6001T-I/OT, the OPA340UA uniquely balances 5.5 MHz bandwidth, 6 V/µs slew rate, rail-to-rail I/O, and 750 µA IQ - making it the only option among the three capable of driving 12-bit ADCs at 100 kSPS while maintaining <0.01% linearity and <1 µs settling.
Availability
OPA340UA is available at Aetrix Electronics and suitable for data acquisition, audio processing, and process control applications requiring stable component supply, consistent parametric performance across production lots, and long-term industrial temperature grade support (–40°C to +85°C).
Supply support for OPA340UA 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™ portfolio, designed specifically for low-voltage, single-supply signal conditioning in space- and power-constrained systems - emphasizing rail-to-rail operation, low distortion, and micro-size packaging.
FAQ
What is the maximum supply voltage for the OPA340UA?
The OPA340UA supports a maximum supply voltage of 5.5 V across its V+ and GND pins. Operation above this rating risks permanent damage, as confirmed by TI's Absolute Maximum Ratings table (SBOS073C Section 6.1). The device is fully specified from 2.7 V to 5 V, with functional operation verified down to 2.5 V - making it compatible with 3.3 V and 5 V systems alike. Always use 0.1 µF ceramic decoupling on V+.
Does the OPA340UA support rail-to-rail input and output simultaneously?
Yes, the OPA340UA supports true rail-to-rail input and output operation concurrently. Its input common-mode range spans –0.3 V to (V+) + 0.3 V, and output swing reaches within 1 mV of both rails under 100-kΩ load - verified in TI's Electrical Characteristics table (Section 6.7). This enables full utilization of 0–5 V ADC input ranges without external level-shifting circuitry, as demonstrated in the ADS7816 reference design.
Can the OPA340UA drive the ADS7816 12-bit ADC directly?
Yes, the OPA340UA is explicitly optimized for driving sampling ADCs like the ADS7816. TI's Application section (Section 8.2) shows validated noninverting and inverting configurations with RC filtering, citing 1 µs 0.1% settling time and charge injection suppression as key enablers. The OPA340UA's 6 V/µs slew rate and 5.5 MHz GBW ensure stable interface with the ADS7816's 100 kSPS sampling rate and switched-capacitor input.
What are the unused pins on the OPA340UA SOIC-8 package?
The OPA340UA in SOIC-8 (D package) has three no-connect pins: Pins 5, 6, and 8. Per TI's Pin Functions table (Section 5), these are internally unconnected and must remain floating - no ties to GND, V+, or signal nets. PCB layout must isolate these pads completely to prevent parasitic coupling, ESD leakage, or unintended capacitance that could degrade high-frequency performance or stability.
How does the OPA340UA's input stage handle signals beyond the supply rails?
The OPA340UA's complementary input stage tolerates input voltages up to 0.5 V beyond the supply rails (–0.5 V to V+ + 0.5 V), provided input current is limited to ≤10 mA - achieved via series resistors as shown in Figure 24 of SBOS073C. Exceeding this current risks latch-up or parametric shift. Within the specified range, the N- and P-channel pairs seamlessly hand off conduction, preserving CMRR and PSRR outside the 400-mV transition region.
OPA340UA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- MicroAmplifier™
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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:
- 8-SOIC
OPA340UA FAQ
1.How can I place an order for OPA340UA through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA340UA 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 OPA340UA reliable?
The price and inventory of OPA340UA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA340UA is usually 5 days.
3.What payment methods are accepted for OPA340UA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA340UA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA340UA?
OPA340UA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA340UA 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 OPA340UA?
For technical support, including OPA340UA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA340UA requirements.
6.How does Aetrix verify that OPA340UA is sourced from the original manufacturer or authorized distributors?
All OPA340UA 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 OPA340UA meets industry standards.
7.What is the process for return or replacement of OPA340UA?
All OPA340UA units undergo pre-shipment inspection (PSI). If there is an issue with OPA340UA, 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 OPA340UA part is unused and in its original packaging.
Return procedure for OPA340UA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
OPA340UA Tags
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