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Texas Instruments OPA341UA
- Part No.:
- OPA341UA
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA341UA.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:513
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Product details
Overview
OPA341UA from Texas Instruments is a single-channel, rail-to-rail input/output CMOS operational amplifier with shutdown control, designed for low-voltage (2.7V–5.5V), single-supply operation. It delivers 5.5MHz gain-bandwidth, 6V/µs slew rate, and 750µA quiescent current per channel, enabling high-fidelity signal conditioning in portable data acquisition systems driving sampling A/D converters.
For engineers reviewing the OPA341UA datasheet, OPA341UA pinout, OPA341UA application, or OPA341UA equivalent, this device is selected for precision sensor biasing, active filtering, and low-power analog front-ends where rail-to-rail swing, fast settling (1µs to 0.1%), and shutdown current as low as 10nA are critical design requirements.
Technical Context
The OPA341UA uses a complementary CMOS input stage-N-channel and P-channel differential pairs-to achieve rail-to-rail input common-mode range extending 300mV beyond supply rails. Its class AB output stage enables rail-to-rail output swing within 1mV of rails under 100kΩ load.
It features a CMOS-compatible shutdown pin (SD) with defined logic thresholds: amplifier active when VEN ≥ (V–) + 2V, disabled when VEN ≤ (V–) + 0.8V. Turn-on and turn-off times are 3µs and 1µs respectively, supporting synchronized power gating in sampling systems like ADS7816 interfacing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-Bandwidth Product | 5.5MHz - supports stable unity-gain operation and closed-loop bandwidth up to ~5MHz for signal conditioning filters. |
| Slew Rate | 6V/µs - ensures <1µs 0.1% settling for 2V step, suitable for driving medium-speed (≤100kHz) sampling ADCs. |
| Input Offset Voltage | ±2mV (typ), ±6mV (max) - enables accurate DC-coupled sensor interfaces without external trimming. |
| Quiescent Current | 0.75mA per channel at 5V - balances speed and battery life in portable instrumentation. |
| Shutdown Current | 10nA typical - reduces system standby power by >99.9% versus active mode. |
| Rail-to-Rail Output Swing | Within 1mV of rails (100kΩ load) - maximizes dynamic range in 3.3V or 5V single-supply systems. |
| Input Common-Mode Range | (V–) – 0.3V to (V+) + 0.3V - accepts signals beyond supply rails, simplifying level-shifting in mixed-signal circuits. |
Pinout & Package
OPA341UA is packaged in SOIC-8 (Package Drawing D), a standard surface-mount 8-pin small-outline integrated circuit with 1.27mm pitch, rated for –55°C to +125°C operation and RoHS-compliant NIPDAU lead finish.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | SD (Shutdown) | CMOS-compatible digital enable input; pulls amplifier into ultra-low-current state (<10nA) when low. |
| 2 | V+ | Positive supply terminal; operates from 2.7V to 5.5V (2.5V min functional). |
| 3 | Out | Analog output node; rail-to-rail capable, drives loads down to 2kΩ while maintaining >96dB open-loop gain. |
| 4 | NC | No connect - internal die pad not bonded; must be left floating or grounded per layout best practice. |
| 5 | NC | No connect - internal die pad not bonded; must be left floating or grounded per layout best practice. |
| 6 | –In | Inverting input; high-impedance (1013Ω || 6pF), low bias current (±0.6pA typ) for precision transimpedance use. |
| 7 | +In | Non-inverting input; identical impedance and bias characteristics as –In; supports rail-to-rail common-mode range. |
| 8 | V– | Negative supply terminal; typically ground in single-supply configurations. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input and output | Extends usable signal range to full supply span, increasing effective resolution in 12-bit+ data acquisition systems. |
| Power shutdown mode | Reduces supply current from 750µA to 10nA, enabling microamp-level system sleep states in battery-powered sensors. |
| Low input bias current | ±0.6pA typical - minimizes voltage error across high-impedance sources (e.g., pH electrodes, photodiodes). |
| Unity-gain stability | Guaranteed stable in G = +1 configuration without external compensation, simplifying anti-aliasing filter design. |
| Wide temperature range | Specified from –55°C to +125°C - qualified for automotive under-hood and industrial process control environments. |
Applications
| Sensor Biasing | Signal Conditioning |
|---|---|
Use Scenario: Providing precise, low-drift bias voltage to resistive bridge sensors (e.g., strain gauges) in portable test equipment. IC Role / Device Role / Timing Role: Precision voltage reference buffer and excitation source with rail-to-rail output swing and µV-level offset stability. Use Value: Maintains full-scale bridge output amplitude across 2.7V–5.5V supply variations, improving measurement repeatability without recalibration. |
Use Scenario: Amplifying and filtering weak analog outputs from thermocouples or RTDs before digitization. IC Role / Device Role / Timing Role: Low-noise, high-CMRR instrumentation amplifier front-end with active low-pass filtering capability. Use Value: 76dB minimum CMRR and 25nV/√Hz input voltage noise preserve signal integrity in noisy industrial environments. |
| Data Acquisition | Active Filters |
Use Scenario: Driving the input of sampling ADCs (e.g., ADS7816) with minimal settling error and charge injection. IC Role / Device Role / Timing Role: High-speed buffer with 1µs 0.1% settling and synchronized shutdown control aligned to ADC conversion timing. Use Value: Eliminates acquisition dead time by enabling concurrent amplifier shutdown and ADC sleep, reducing total system power by >90%. |
Use Scenario: Implementing second-order Sallen-Key or multiple-feedback bandpass filters for speech or sensor frequency isolation. IC Role / Device Role / Timing Role: Unity-gain stable, low-distortion (0.0007% THD+N) op-amp core for precision active filter topologies. Use Value: 5.5MHz GBW and 6V/µs slew rate support filter cutoff frequencies up to 1MHz with <0.1dB passband ripple. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar rail-to-rail, low-power operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA343UA | No shutdown function; otherwise identical specs (5.5MHz GBW, 6V/µs, 750µA IQ). | Not suitable for power-gated systems; requires external enable circuitry for standby reduction. | Select OPA343UA only if shutdown is unnecessary and board space allows discrete enable control. |
| MCP6001T-I/OT | Lower bandwidth (1MHz), higher offset (±1.5mV max), no rail-to-rail input (VCM = V– to V+–0.3V). | Limited to low-frequency, cost-sensitive applications where input headroom and speed are non-critical. | Choose MCP6001T-I/OT for basic sensor buffering where 5.5MHz performance and true rail-to-rail input are not required. |
Compared with OPA341UA, OPA343UA removes shutdown capability but retains identical AC performance and power consumption, while MCP6001T-I/OT trades bandwidth, input range, and precision for lower unit cost and wider availability in high-volume consumer designs.
Availability
OPA341UA is available at Aetrix Electronics and suitable for sensor biasing, data acquisition, and active filter applications requiring stable component supply, extended temperature qualification (–55°C to +125°C), and long-term industrial lifecycle support.
Supply support for OPA341UA 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 signal chain solutions.
The OPA341UA belongs to TI's microAmplifier™ series, engineered specifically for miniature, low-voltage, single-supply systems where rail-to-rail operation, shutdown control, and high-speed precision are essential - such as portable instrumentation and battery-powered data loggers.
FAQ
What is the absolute maximum supply voltage for the OPA341UA?
The OPA341UA has an absolute maximum supply voltage of 6.0V between V+ and V– terminals. Exceeding this rating may cause permanent damage. The device is fully specified over 2.7V to 5.5V and functions down to 2.5V, but operation above 5.5V voids parametric guarantees and risks reliability degradation.
Does the OPA341UA support true rail-to-rail input common-mode range?
Yes, the OPA341UA supports rail-to-rail input with a common-mode voltage range from (V–) – 0.3V to (V+) + 0.3V - extending 300mV beyond both supply rails. This is achieved via a complementary CMOS input stage, enabling direct interfacing with sensors or DACs operating at supply extremes.
How does the shutdown feature of the OPA341UA behave electrically?
The OPA341UA shutdown pin (Pin 1) is CMOS-compatible: the amplifier activates when SD ≥ (V–) + 2V and disables when SD ≤ (V–) + 0.8V. In shutdown, quiescent current drops to 10nA typical, and output enters high-impedance state. Turn-on/turn-off times are 3µs and 1µs respectively, verified under 5V supply conditions.
Can the OPA341UA drive capacitive loads, and what is the recommended approach?
The OPA341UA can drive up to ~1000pF in unity-gain configuration without instability. For larger capacitive loads, TI recommends adding a 10Ω–20Ω series resistor at the output (Figure 4 in SBOS202A). This isolates the op-amp from the capacitance, reducing overshoot and ringing while preserving DC accuracy within 0.2% for RL ≥ 10kΩ.
What is the output voltage swing specification for the OPA341UA under 2kΩ load?
Under a 2kΩ load, the OPA341UA delivers output swing within 40mV to 200mV of each rail (typical to max), maintaining >96dB open-loop gain. This is confirmed in the Electrical Characteristics table (Output Voltage Swing from Rail, RL = 2kΩ, AOL > 96dB), making it suitable for driving moderate-impedance ADC inputs and active filters.
OPA341UA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- MicroAmplifier™
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Bulk
- 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:
- 0.6 pA
- Voltage - Input Offset:
- 2 mV
- Current - Supply:
- 750µA
- Current - Output / Channel:
- 50 mA
- Voltage - Supply Span (Min):
- 2.5 V
- Voltage - Supply Span (Max):
- 5.5 V
- Operating Temperature:
- -55°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
OPA341UA FAQ
1.How can I place an order for OPA341UA through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA341UA 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 OPA341UA reliable?
The price and inventory of OPA341UA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA341UA is usually 5 days.
3.What payment methods are accepted for OPA341UA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA341UA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA341UA?
OPA341UA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA341UA 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 OPA341UA?
For technical support, including OPA341UA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA341UA requirements.
6.How does Aetrix verify that OPA341UA is sourced from the original manufacturer or authorized distributors?
All OPA341UA 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 OPA341UA meets industry standards.
7.What is the process for return or replacement of OPA341UA?
All OPA341UA units undergo pre-shipment inspection (PSI). If there is an issue with OPA341UA, 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 OPA341UA part is unused and in its original packaging.
Return procedure for OPA341UA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
OPA341UA Tags
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LM358DT
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LM358DR
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