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Texas Instruments OPA340UA/2K5G4
- Part No.:
- OPA340UA/2K5G4
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA340UA/2K5G4.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,331
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Product details
Overview
OPA340UA/2K5G4 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 2.7–5.5 V systems like portable data acquisition and audio front-ends.
For engineers reviewing the OPA340UA/2K5G4 datasheet, OPA340UA/2K5G4 pinout, OPA340UA/2K5G4 application, or OPA340UA/2K5G4 equivalent, key selection criteria include rail-to-rail I/O capability at low quiescent current (750 µA), THD+N of 0.0007% at 1 kHz, and verified performance driving capacitive loads up to 1000 pF in unity-gain configuration.
Technical Context
The OPA340UA/2K5G4 uses a complementary N/P-channel input stage to achieve rail-to-rail common-mode range extending 500 mV beyond both supply rails, with laser trimming minimizing offset discontinuity across the transition region. Its class AB output stage supports 100-kΩ loads while maintaining open-loop gain ≥106 dB.
It operates stably from 2.5 V to 5.5 V, with specifications guaranteed over –40°C to +85°C. Input bias current is ultra-low (±0.2 pA typ), and voltage noise density is 25 nV/√Hz at 1 kHz - critical for precision sensor interfacing and high-resolution ADC buffering.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 2.7–5.5 V operation; functional down to 2.5 V - enables direct interface with 3.3 V and 5 V logic and ADCs like ADS7816. |
| Gain-Bandwidth Product | 5.5 MHz - supports stable unity-gain operation and closed-loop bandwidth >1 MHz with moderate gain. |
| Slew Rate | 6 V/µs - ensures <1 µs 0.1% settling for 2-V steps, critical for driving sampling ADC inputs without distortion. |
| Input Offset Voltage | ±150 µV (typ) - minimizes DC error in precision I/V conversion and sensor signal chains. |
| THD+N | 0.0007% at 1 kHz - preserves signal integrity in audio and communications applications. |
| Quiescent Current | 750 µA per amplifier - allows battery-powered operation in portable instrumentation and IoT edge nodes. |
| Output Swing | Within 1 mV of rails (100-kΩ load) - maximizes dynamic range in low-voltage, single-supply systems. |
Pinout & Package
OPA340UA/2K5G4 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 P and D package variants per TI SBOS073C.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT | Amplifier output; capable of rail-to-rail swing and driving 100-kΩ loads with <1 mV headroom. |
| 2 | –IN | Inverting input; part of complementary input stage enabling rail-to-rail common-mode range. |
| 3 | +IN | Noninverting input; matched to –IN for precision differential operation and low input offset. |
| 4 | V– | Negative supply terminal; tied to ground in single-supply configurations (e.g., 0 V to 5 V). |
| 5 | NC | No internal connection; must be left floating or grounded per layout best practices. |
| 6 | NC | No internal connection; unused pin in SOIC variant - no electrical function. |
| 7 | V+ | Positive supply terminal; accepts 2.7–5.5 V; requires 0.01 µF ceramic bypass capacitor to ground. |
| 8 | NC | No internal connection; electrically isolated - no routing or termination required. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input | Common-mode range extends 500 mV beyond both supply rails - enables direct sensing of signals near ground or V+ in single-supply systems. |
| Rail-to-rail output | Swings to within 1 mV of V+ and V– under 100-kΩ load - preserves full ADC input range and SNR in 12-bit+ systems. |
| Low THD+N | 0.0007% at 1 kHz - maintains spectral purity for audio line drivers and communication channel conditioning. |
| Ultra-low input bias current | ±0.2 pA typical - prevents loading errors in high-impedance sensor interfaces (e.g., piezoelectric, pH electrodes). |
| Capacitive load drive | Stable with up to 1000 pF in unity-gain - eliminates need for external isolation resistors when buffering switched-capacitor ADC inputs. |
Applications
| Driving Sampling ADCs | Portable Audio Front-Ends |
|---|---|
Use Scenario: Buffering and gain-setting for 12-bit sampling ADCs like ADS7816 in handheld test equipment. IC Role / Device Role / Timing Role: Signal conditioner and charge injector compensator at ADC analog input; provides low-output-impedance drive during sample-and-hold acquisition phase. Use Value: Eliminates missing codes and integral nonlinearity caused by source impedance interacting with ADC input capacitance. | Use Scenario: Line-level amplification and anti-alias filtering in battery-powered voice recorders. IC Role / Device Role / Timing Role: Low-noise, low-distortion gain block preceding sigma-delta ADC; operates from single 3.3 V supply. Use Value: Delivers 102 dB SNR and <0.001% THD+N across 20 Hz–20 kHz, preserving speech intelligibility and music fidelity. |
| Process Sensor Interfaces | PCMCIA Analog I/O Cards |
Use Scenario: Conditioning millivolt-level outputs from RTDs and thermocouples in industrial PLC modules. IC Role / Device Role / Timing Role: Precision instrumentation amplifier front-end with rail-to-rail input enabling direct connection to 0–5 V reference rails. Use Value: Achieves <1 µV/°C offset drift and 92 dB CMRR - reduces calibration frequency and improves long-term measurement stability. | Use Scenario: Signal conditioning for legacy PCMCIA cards requiring compact, low-power analog I/O expansion. IC Role / Device Role / Timing Role: Single-supply op amp providing gain, level-shifting, and filtering in space-constrained 68-pin card edge footprint. Use Value: SOIC-8 package fits standard PCMCIA layout constraints while delivering 5.5 MHz bandwidth for real-time waveform capture. |
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 voltage ±10 µV vs ±500 µV (OPA340UA/2K5G4); higher IQ (17 µA vs 750 µA) | Better DC precision for sensor offsets; less suitable for high-speed ADC driving due to 350 kHz GBW | Select OPA333AIDBVR only when microvolt-level offset stability dominates over speed and power. |
| MCP6001T-E/OT | Lower bandwidth (1 MHz vs 5.5 MHz); higher input bias current (1 pA vs 0.2 pA); same rail-to-rail I/O and 700 µA IQ | Adequate for DC-coupled sensor buffers but cannot settle fast enough for 100 kHz+ sampling ADCs | Choose MCP6001T-E/OT for cost-sensitive, low-frequency (<10 kHz) applications where 5.5 MHz BW is unnecessary. |
Compared with OPA333AIDBVR and MCP6001T-E/OT, the OPA340UA/2K5G4 uniquely balances 5.5 MHz bandwidth, 6 V/µs slew rate, rail-to-rail I/O, and 750 µA quiescent current - making it optimal for medium-speed, single-supply signal chains where both AC fidelity and power efficiency matter.
Availability
OPA340UA/2K5G4 is available at Aetrix Electronics and suitable for portable instrumentation, industrial sensor interfaces, and audio front-ends requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for OPA340UA/2K5G4 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 ecosystems.
The OPA340 series belongs to TI's MicroAmplifier™ portfolio, designed specifically for low-voltage, single-supply signal conditioning in portable, industrial, and audio applications demanding rail-to-rail performance and low power.
FAQ
What is the maximum capacitive load the OPA340UA/2K5G4 can drive stably in unity-gain configuration?
The OPA340UA/2K5G4 drives up to 1000 pF stably in unity-gain configuration without external compensation, as confirmed in TI SBOS073C Figure 21. This capability eliminates external isolation resistors when buffering switched-capacitor ADC inputs like those in the ADS7816, preserving DC accuracy and simplifying layout. For loads exceeding 1000 pF, a 10–20 Ω series resistor at the output restores phase margin.
Does the OPA340UA/2K5G4 support true rail-to-rail input common-mode range?
Yes, the OPA340UA/2K5G4 supports rail-to-rail input with a common-mode voltage range extending 500 mV beyond both supply rails (e.g., –0.3 V to +5.3 V on a +5 V supply). This is achieved via a complementary N/P-channel input stage with laser-trimmed offset matching, enabling direct interfacing with sensors and DACs operating near ground or V+ without level-shifting circuitry.
What is the guaranteed operating temperature range for the OPA340UA/2K5G4?
The OPA340UA/2K5G4 is specified over –40°C to +85°C for all electrical parameters, with extended operation possible from –55°C to +125°C. Thermal metrics including RθJA = 142°C/W (SOIC-8) ensure reliable performance in industrial enclosures and automotive under-hood environments when proper PCB copper area and airflow are maintained.
Can the OPA340UA/2K5G4 be used with a 2.5 V supply?
Yes, the OPA340UA/2K5G4 operates down to 2.5 V, though full specifications are guaranteed from 2.7 V to 5.5 V. At 2.5 V, rail-to-rail output swing remains functional (within ~5 mV of rails at 10 kΩ), and bandwidth reduces modestly to ~4.8 MHz. This makes the OPA340UA/2K5G4 suitable for ultra-low-voltage battery-powered systems where marginal supply headroom exists.
How does the OPA340UA/2K5G4 compare to dual or quad variants like OPA2340 or OPA4340 in terms of pin compatibility?
The OPA340UA/2K5G4 (SOIC-8) shares identical pinout with the OPA2340 in SOIC-8 package for pins 1–4 and 7–8, but differs in channel count and internal connectivity: OPA340UA/2K5G4 uses pins 5, 6, and 8 as NC, whereas OPA2340 assigns them to second channel I/O. Thus, they are not pin-compatible - board redesign is required when substituting between single and dual versions.
OPA340UA/2K5G4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- MicroAmplifier™
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- 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:
- 8-SOIC
OPA340UA/2K5G4 FAQ
1.How can I place an order for OPA340UA/2K5G4 through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA340UA/2K5G4 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/2K5G4 reliable?
The price and inventory of OPA340UA/2K5G4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA340UA/2K5G4 is usually 5 days.
3.What payment methods are accepted for OPA340UA/2K5G4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA340UA/2K5G4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA340UA/2K5G4?
OPA340UA/2K5G4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA340UA/2K5G4 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/2K5G4?
For technical support, including OPA340UA/2K5G4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA340UA/2K5G4 requirements.
6.How does Aetrix verify that OPA340UA/2K5G4 is sourced from the original manufacturer or authorized distributors?
All OPA340UA/2K5G4 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/2K5G4 meets industry standards.
7.What is the process for return or replacement of OPA340UA/2K5G4?
All OPA340UA/2K5G4 units undergo pre-shipment inspection (PSI). If there is an issue with OPA340UA/2K5G4, 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/2K5G4 part is unused and in its original packaging.
Return procedure for OPA340UA/2K5G4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
OPA340UA/2K5G4 Tags
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