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Texas Instruments OPA2338EA/3K
- Part No.:
- OPA2338EA/3K
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SOT-23-8
- Datasheet:
-
OPA2338EA/3K.pdf
- Description:
- IC CMOS 2 CIRCUIT SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:1,142
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Product details
Overview
OPA2338EA/3K from Texas Instruments is a dual, rail-to-rail output CMOS operational amplifier optimized for gains ≥5, packaged in SOT23-8. It delivers 12.5MHz gain-bandwidth, 4.6V/µs slew rate, 120dB open-loop gain, and 525µA per amplifier quiescent current while operating from 2.5V to 5.5V single supply - ideal for low-power, space-constrained signal conditioning in portable medical instruments.
For engineers reviewing the OPA2338EA/3K datasheet, OPA2338EA/3K pinout, OPA2338EA/3K application, or OPA2338EA/3K equivalent, key selection criteria include its G ≥ 5 stability requirement, FET-input bias current ≤10pA, rail-to-rail output swing within 125mV of rails (RL = 25kΩ), input common-mode range extending to ground, and SOT23-8 thermal resistance of 200°C/W.
Technical Context
The OPA2338EA/3K implements a high-speed, unity-gain unstable CMOS op amp architecture requiring minimum closed-loop gain of 5 for stability. Its input stage uses FET transistors to achieve ≤10pA input bias current and rail-inclusive common-mode range (−0.2V to V+ − 1.2V), enabling direct interfacing with grounded-sensor sources in single-supply systems.
Output stage design supports rail-to-rail swing (125mV from each rail at RL = 25kΩ) and fast overload recovery (0.5µs), while internal compensation ensures phase margin >60° at G = 5. The dual amplifier structure provides independent circuitry with <0.3µV/V channel separation, minimizing crosstalk in multi-channel sensing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-Bandwidth Product | 12.5MHz at G = 5 - enables stable amplification of signals up to ~2.5MHz with 5× gain before bandwidth rolloff. |
| Slew Rate | 4.6V/µs at G = 5 - supports clean 3VPP, 1kHz sine wave output without slew-induced distortion. |
| Input Bias Current | ≤10pA max - preserves signal integrity in high-impedance photodiode preamp and sensor interfaces. |
| Open-Loop Gain | 120dB typical - ensures <0.001% gain error in precision instrumentation amplifier configurations. |
| Quiescent Current | 525µA per amplifier - allows dual-channel operation from coin-cell or Li-ion battery for >1-year runtime in portable devices. |
| Supply Voltage Range | 2.5V to 5.5V - compatible with modern low-voltage microcontrollers and ADCs without level-shifting. |
| Output Swing | Within 125mV of rails (RL = 25kΩ) - maximizes dynamic range in 3.3V or 5V single-supply data acquisition systems. |
Pinout & Package
SOT23-8 surface-mount package (DCN designation), 2.9mm × 2.8mm footprint, 1.45mm height, moisture sensitivity level 1 (260°C peak reflow), tape-and-reel packaging (3000 units/reel).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | V+ | Positive supply rail connection - must be bypassed with 0.01µF ceramic capacitor near pin for stability. |
| 2 | Out B | Output of second amplifier - rail-to-rail swing supports direct driving of SAR ADC reference inputs. |
| 3 | −In B | Inverting input of second amplifier - high-impedance FET node enables high-R feedback networks without gain error. |
| 4 | +In B | Non-inverting input of second amplifier - common-mode range includes ground, allowing single-supply sensor biasing. |
| 5 | Out A | Output of first amplifier - independently buffered; no crosstalk to Out B even under overload. |
| 6 | −In A | Inverting input of first amplifier - matched to Pin 3 for differential pair accuracy in instrumentation topologies. |
| 7 | +In A | Non-inverting input of first amplifier - identical electrical characteristics to Pin 4 for balanced dual-channel designs. |
| 8 | V− | Negative supply rail (ground in single-supply use) - low-inductance return path critical for THD+N <0.0035% at 1kHz. |
Key Features
| Feature | Design Value |
|---|---|
| G ≥ 5 stability | Eliminates need for external compensation in gain-of-5+ circuits, reducing BOM count and PCB area vs. unity-gain-stable alternatives. |
| Rail-to-rail output | Delivers full 3.1VPP swing from 3.3V supply, increasing effective resolution when driving 12-bit ADCs like ADS7822. |
| FET input stage | 10pA max IB enables use with 1MΩ+ source impedances in electret microphone preamps without DC offset drift. |
| Low quiescent current | 525µA per amp allows dual-channel signal conditioning in battery-powered ECG front-ends with <1µA standby leakage. |
| Independent dual amplifiers | Zero interaction between channels during overdrive ensures accurate dual-sensor readout in portable test equipment. |
Applications
| Photodiode Pre-Amplifier | Battery-Powered Instrumentation |
|---|---|
Use Scenario: Amplifying low-current output (nA–µA) from reverse-biased silicon photodiodes in portable pulse oximeters. IC Role / Device Role / Timing Role: Transimpedance amplifier with 1MΩ feedback resistor, converting photocurrent to voltage while maintaining bandwidth >10kHz. Use Value: 10pA input bias current prevents signal loss across high-value feedback resistors; rail-to-rail output maximizes ADC utilization in 3.3V systems. | Use Scenario: Signal conditioning for analog sensors (temperature, pressure) in handheld multimeters powered by two AA cells. IC Role / Device Role / Timing Role: Dual-channel buffer and gain stage preceding 12-bit SAR ADC, operating from 3V supply with <1.1mA total quiescent draw. Use Value: 525µA per amplifier enables dual-channel operation for >500 hours on alkaline batteries; G ≥ 5 stability simplifies gain-setting network design. |
| Medical Sensor Interface | Audio System Front-End |
Use Scenario: Biopotential amplification in portable EEG/ECG recorders using dry electrodes with high source impedance (>100kΩ). IC Role / Device Role / Timing Role: First-stage instrumentation amplifier input buffer, rejecting common-mode noise while preserving microvolt-level neural signals. Use Value: Input common-mode range including ground allows direct electrode connection without biasing circuitry; 120dB open-loop gain ensures <0.001% gain error. | Use Scenario: Line-level signal buffering and filtering in USB-C audio dongles with integrated DAC and headphone driver. IC Role / Device Role / Timing Role: Dual-channel active filter (300Hz–3kHz bandpass) and output driver preceding Class AB headphone amplifier. Use Value: 12.5MHz GBW supports steep filter roll-off without phase shift; rail-to-rail output drives 32Ω loads to 1VPP with minimal headroom loss. |
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 |
|---|---|---|---|
| OPA2337EA/3K | Unity-gain stable; 3MHz GBW, 1.2V/µs slew rate, same SOT23-8 package and pinout. | Preferred for G = 1–2 applications (e.g., voltage followers, integrators); lower bandwidth limits high-frequency fidelity. | Select OPA2337EA/3K when unity-gain stability is required and 3MHz bandwidth suffices. |
| MCP6L92T-E/MS | Unity-gain stable; 10MHz GBW, 4.5V/µs slew rate; 1.2µA max IB; SO-8 package (not pin-compatible). | Higher drive capability (25mA output) but higher IB limits use with >100kΩ sources; requires PCB layout change. | Choose MCP6L92T-E/MS only if higher output current is needed and layout revision is acceptable. |
Compared with OPA2337EA/3K and MCP6L92T-E/MS, the OPA2338EA/3K uniquely balances high-speed performance (12.5MHz, 4.6V/µs) with ultra-low input bias current (≤10pA) in the space-saving SOT23-8 package - making it optimal for precision, battery-sensitive, gain ≥5 signal chains where board area and power are constrained.
Availability
OPA2338EA/3K is available at Aetrix Electronics and suitable for battery-powered instrumentation, photodiode pre-amplifiers, and medical sensor interfaces requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for OPA2338EA/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 company headquartered in Dallas, Texas, specializing in analog and embedded processing technologies with over 90 years of innovation in precision analog ICs.
The OPA2338EA/3K belongs to TI's MicroAmplifier™ series, designed specifically for miniature, low-power, high-precision analog signal conditioning in space- and energy-constrained portable electronics.
FAQ
What is the minimum stable gain for OPA2338EA/3K?
The OPA2338EA/3K is optimized for closed-loop gains ≥5 and is not unity-gain stable. Attempting to use it at G = 1 will cause oscillation due to insufficient phase margin. For unity-gain applications, TI recommends the pin-compatible OPA2337EA/3K instead. The 5× minimum gain requirement is inherent to the internal compensation and applies across the full −40°C to +85°C temperature range.
Can OPA2338EA/3K operate from a 2.5V supply?
Yes, the OPA2338EA/3K is fully specified to operate from 2.5V to 5.5V single supply. Electrical characteristics including 12.5MHz gain-bandwidth, 4.6V/µs slew rate, and rail-to-rail output swing are guaranteed at 2.5V. Quiescent current remains 525µA per amplifier, making it suitable for coin-cell–powered devices where supply voltage sags below 3V.
What is the input common-mode voltage range of OPA2338EA/3K?
The input common-mode voltage range of OPA2338EA/3K extends from (V−) − 0.2V to (V+) − 1.2V. With V− = 0V (single-supply ground), this means inputs can swing from −0.2V to V+ − 1.2V - enabling direct connection to grounded sensors and eliminating the need for input biasing networks in most portable applications.
Does OPA2338EA/3K have rail-to-rail input capability?
No, the OPA2338EA/3K features rail-to-rail *output* swing but not rail-to-rail *input*. Its input common-mode range stops 1.2V below V+, so it cannot accept signals all the way to the positive rail. However, the lower bound includes ground (−0.2V), supporting true single-supply operation with grounded-signal sources such as photodiodes and thermistors.
What package type and marking does OPA2338EA/3K use?
The OPA2338EA/3K is supplied in an 8-pin SOT23 package (TI package designator DCN), measuring 2.9mm × 2.8mm. The top-side marking is "A8", laser-etched on the device body. It ships in tape-and-reel format with 3000 units per reel, moisture sensitivity level 1, and lead finish NIPDAU for RoHS-compliant reflow soldering.
OPA2338EA/3K Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- MicroAmplifier™
- Package/Case:
- SOT-23-8
- Packaging:
- Tape & Reel (TR)
- 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:
- SOT-23-8
OPA2338EA/3K FAQ
1.How can I place an order for OPA2338EA/3K through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA2338EA/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 OPA2338EA/3K reliable?
The price and inventory of OPA2338EA/3K are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA2338EA/3K is usually 5 days.
3.What payment methods are accepted for OPA2338EA/3K?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA2338EA/3K transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA2338EA/3K?
OPA2338EA/3K orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA2338EA/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 OPA2338EA/3K?
For technical support, including OPA2338EA/3K datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA2338EA/3K requirements.
6.How does Aetrix verify that OPA2338EA/3K is sourced from the original manufacturer or authorized distributors?
All OPA2338EA/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 OPA2338EA/3K meets industry standards.
7.What is the process for return or replacement of OPA2338EA/3K?
All OPA2338EA/3K units undergo pre-shipment inspection (PSI). If there is an issue with OPA2338EA/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 OPA2338EA/3K part is unused and in its original packaging.
Return procedure for OPA2338EA/3K:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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