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Texas Instruments OPA2338UA
- Part No.:
- OPA2338UA
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA2338UA.pdf
- Description:
- IC CMOS 2 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:271
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Product details
Overview
OPA2338UA from Texas Instruments is a dual, rail-to-rail output CMOS operational amplifier optimized for gain ≥5, delivering 12.5MHz gain-bandwidth product and 4.6V/µs slew rate at 5V supply. It operates from 2.5V to 5.5V single supply, draws 525µA per amplifier, and features 10pA max input bias current-ideal for photodiode pre-amplification in battery-powered medical instruments.
For engineers reviewing the OPA2338UA datasheet, OPA2338UA pinout, OPA2338UA application, or OPA2338UA equivalent, key selection criteria include its G ≥ 5 stability requirement, SOT23-8 or SOIC-8 package options, rail-to-rail output swing down to 125mV from rails (RL = 25kΩ), FET-input low-noise performance, and compatibility with space-constrained, low-power signal conditioning circuits.
Technical Context
The OPA2338UA implements a high-speed, unity-gain unstable CMOS op amp architecture optimized for closed-loop gains of 5 or greater. Its internal compensation ensures stability only when configured with minimum noise gain ≥5, distinguishing it from the unity-gain stable OPA2337 series.
It supports single-supply operation with input common-mode range extending from (V−) − 0.2V to (V+) − 1.2V and rail-to-rail output swing-enabling full dynamic range utilization in low-voltage systems such as 3V ADC drivers and portable instrumentation front-ends.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-Bandwidth Product | 12.5MHz at G = 5 - enables high-fidelity amplification of signals up to ~2.5MHz before 3dB roll-off |
| Slew Rate | 4.6V/µs at G = 5 - supports fast transient response for audio and data acquisition without distortion |
| Input Bias Current | ±10pA max - preserves signal integrity in high-impedance sensor interfaces like photodiode pre-amps |
| Supply Voltage Range | 2.5V to 5.5V - compatible with Li-ion, 3.3V, and 5V logic domains without level-shifting |
| Quiescent Current | 525µA per amplifier - enables dual-channel amplification in micropower systems with <1.1mA total IQ |
| Open-Loop Gain | 120dB typical - ensures <0.001% gain error in precision DC-coupled configurations |
| Output Swing | 125mV from rail (RL = 25kΩ) - maximizes usable output voltage headroom in single-supply designs |
Pinout & Package
OPA2338UA is available in SOIC-8 (package D) and SOT23-8 (package DCN) variants. The SOIC-8 version uses standard 150°C/W thermal resistance and is supplied in tube or tape-and-reel formats.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | V+ | Positive supply rail connection - must be bypassed with 0.01µF ceramic capacitor near pin |
| 2 | Out B | Output of second amplifier - rail-to-rail capable, drives loads ≥25kΩ for full spec compliance |
| 3 | −In B | Inverting input of second amplifier - high-impedance FET node, sensitive to PCB leakage |
| 4 | +In B | Non-inverting input of second amplifier - accepts common-mode voltages down to V− − 0.2V |
| 5 | Out A | Output of first amplifier - independent channel, <0.3µV/V crosstalk to Channel B |
| 6 | −In A | Inverting input of first amplifier - matched to Pin 3 for differential applications |
| 7 | +In A | Non-inverting input of first amplifier - identical electrical characteristics to Pin 4 |
| 8 | V− | Negative supply rail (ground in single-supply use) - return path for both amplifiers' quiescent current |
Key Features
| Feature | Design Value |
|---|---|
| G ≥ 5 stability optimization | Enables higher bandwidth than unity-gain stable counterparts without external compensation |
| Rail-to-rail output swing | Delivers full dynamic range in 3V systems - e.g., 0.125V to 2.875V output with 3V supply |
| FET-input architecture | 10pA max input bias current allows use with >1MΩ source impedances without significant offset drift |
| Low 525µA quiescent current | Supports always-on sensor signal conditioning in battery-operated devices with multi-year runtime |
| CMOS process with ground-sensing inputs | Input common-mode range includes V−, simplifying single-supply biasing in non-inverting configurations |
Applications
| Photodiode Pre-Amplifier | Battery-Powered Instrumentation |
|---|---|
Use Scenario: Amplifying weak current from reverse-biased photodiodes in pulse oximeters or environmental light sensors. IC Role / Device Role / Timing Role: Transimpedance amplifier with high-Z input and rail-to-rail output driving 12-bit ADC reference buffers. Use Value: 10pA input bias current minimizes dark-current-induced offset; 4.6V/µs slew rate handles fast optical pulses without distortion. | Use Scenario: Signal conditioning in handheld multimeters or portable ECG monitors powered by coin cells. IC Role / Device Role / Timing Role: Dual-channel buffer and gain stage for analog front-end, operating from 2.7V supply with minimal power overhead. Use Value: 525µA per amplifier enables two independent channels under 1.1mA total, extending battery life while maintaining 12.5MHz bandwidth. |
| Medical Instrument Front-End | ADC Driver for Precision Data Acquisition |
Use Scenario: Low-noise amplification of biopotential signals (e.g., EEG, EMG) prior to digitization. IC Role / Device Role / Timing Role: First-stage instrumentation amplifier with matched input pairs and low THD+N (0.0035% at 1kHz). Use Value: 26nV/√Hz input voltage noise density and 0.3µV/V channel separation preserve signal fidelity across dual-channel acquisition paths. | Use Scenario: Driving SAR ADC inputs (e.g., ADS7822) requiring fast settling and low distortion. IC Role / Device Role / Timing Role: Gain-of-5 driver ensuring 1.4µs 0.1% settling time into 100pF load, matching ADC sampling clock timing margins. Use Value: 12.5MHz GBW and 4.6V/µs slew rate guarantee full-scale step response within ADC aperture time, minimizing code-dependent errors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual CMOS op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA2337UA | Unity-gain stable; 3MHz GBW, 1.2V/µs slew rate, same pinout and supply range | Preferred for G = 1–4 configurations where OPA2338UA requires external compensation | Select OPA2337UA when circuit gain is <5 or when simplicity of unity-gain operation outweighs bandwidth needs |
| MCP6022-I/SN | Unity-gain stable; 10MHz GBW, 2.2V/µs slew rate; 100pA input bias current; 1.8V–6V supply | Broader supply range and lower minimum voltage, but higher input bias current limits photodiode use | Choose MCP6022-I/SN for ultra-low-voltage (1.8V) systems or where unity-gain stability is mandatory without redesign |
Compared with OPA2337UA and MCP6022-I/SN, the OPA2338UA delivers 4.2× higher bandwidth and 2.1× faster slew rate at G ≥ 5, making it optimal for high-speed, moderate-gain signal chains where power and board space are constrained-but requires careful gain-setting to ensure stability.
Availability
OPA2338UA is available at Aetrix Electronics and suitable for battery-powered instruments, photodiode pre-amplifiers, and medical instrument front-ends requiring stable component supply across extended production lifecycles.
Supply support for OPA2338UA 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 op amps and low-power signal chain solutions.
The OPA2338UA belongs to TI's MicroAmplifier™ series, designed specifically for miniature, low-cost, high-performance analog signal conditioning in space- and power-constrained applications.
FAQ
What is the minimum stable gain for OPA2338UA?
The OPA2338UA is optimized for closed-loop gains greater than or equal to 5. It is not unity-gain stable; attempting G = 1 without external compensation will cause oscillation. The datasheet specifies stability only for noise gain ≥5, verified across temperature and supply voltage ranges. For lower gains, compensation networks (e.g., capacitor between R1 and R2) are required per Figure 3 in SBOS077B.
Does OPA2338UA support true single-supply operation with inputs at ground?
Yes, the OPA2338UA supports true single-supply operation: its input common-mode voltage range extends to (V−) − 0.2V, meaning it accepts inputs at ground when V− = 0V. This enables direct coupling of sensors referenced to system ground without level-shifting circuitry-critical for low-voltage biomedical and portable instrumentation designs using the OPA2338UA.
What package options are available for OPA2338UA?
The OPA2338UA is offered in SOIC-8 (package D) format, available in tube (75-unit) and tape-and-reel (2500-unit) configurations. While the OPA2338EA variant uses SOT23-8 (DCN), the OPA2338UA ordering number specifically denotes the SOIC-8 package per TI's official ordering information and package addendum documentation.
How does OPA2338UA's input bias current compare to OPA2337UA?
Both OPA2338UA and OPA2337UA specify ±10pA maximum input bias current at +85°C, with typical values of ±0.2pA at +25°C. Their FET-input CMOS architectures deliver identical ultra-low input current performance-making both suitable for high-impedance sensor interfaces. The key distinction lies in gain stability, not input bias current magnitude.
Can OPA2338UA drive capacitive loads directly?
The OPA2338UA can drive up to 100pF capacitive loads while maintaining 0.1% settling in 1.4µs (G = 5), as characterized in the datasheet. For larger loads (>100pF), external isolation resistors (e.g., 10–50Ω in series with output) are recommended to prevent peaking or instability. The device's small-signal overshoot vs. load capacitance curve confirms robustness up to 1nF with proper layout and bypassing, but design validation is required for each target load.
OPA2338UA 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:
- CMOS
- Number of Circuits:
- 2
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 4.6V/µs
- Gain Bandwidth Product:
- 12.5 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 0.2 pA
- Voltage - Input Offset:
- 500 µV
- Current - Supply:
- 525µA (x2 Channels)
- Current - Output / Channel:
- 9 mA
- Voltage - Supply Span (Min):
- 2.7 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
OPA2338UA FAQ
1.How can I place an order for OPA2338UA through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA2338UA 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 OPA2338UA reliable?
The price and inventory of OPA2338UA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA2338UA is usually 5 days.
3.What payment methods are accepted for OPA2338UA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA2338UA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA2338UA?
OPA2338UA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA2338UA 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 OPA2338UA?
For technical support, including OPA2338UA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA2338UA requirements.
6.How does Aetrix verify that OPA2338UA is sourced from the original manufacturer or authorized distributors?
All OPA2338UA 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 OPA2338UA meets industry standards.
7.What is the process for return or replacement of OPA2338UA?
All OPA2338UA units undergo pre-shipment inspection (PSI). If there is an issue with OPA2338UA, 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 OPA2338UA part is unused and in its original packaging.
Return procedure for OPA2338UA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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