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Texas Instruments OPA838SIDCKT
- Part No.:
- OPA838SIDCKT
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 6-TSSOP, SC-88, SOT-363
- Datasheet:
-
OPA838SIDCKT.pdf
- Description:
- IC OPAMP VFB 1 CIRCUIT SC70-6
- Quantity:
- Payment:
- Shipping:
Inventory:1,773
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Product details
Overview
OPA838SIDCKT from Texas Instruments is a decompensated voltage-feedback operational amplifier optimized for low-power, high-gain signal conditioning. It delivers 300MHz gain-bandwidth product, 1.8nV/√Hz input voltage noise, and only 950µA quiescent current at 5V supply - enabling precision photodiode transimpedance amplification and 12–16-bit SAR ADC driver stages in battery-powered instrumentation.
For engineers reviewing the OPA838SIDCKT datasheet, OPA838SIDCKT pinout, OPA838SIDCKT application, or OPA838SIDCKT equivalent, key selection criteria include its negative-rail input with rail-to-rail output, 90MHz small-signal bandwidth at G = 6V/V, shutdown current <1µA, ±125µV max input offset, and operation from 2.7V to 5.4V single supply.
Technical Context
The OPA838SIDCKT uses a decompensated architecture requiring minimum noninverting gain of 6V/V for stability, yielding 90MHz –3dB bandwidth at 5V. Its input stage supports common-mode voltage down to VS– – 0.2V and up to VS+ – 1.3V, with CMRR ≥95dB.
It integrates a dedicated power-down (PD) pin with 1.5V enable threshold and sub-µA shutdown current, while maintaining 45MHz large-signal bandwidth (4VPP) and 350V/µs slew rate - critical for fast-settling, low-noise gain stages in ultrasonic flow meters and optical receivers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-bandwidth product | 300MHz - enables stable G ≥ 6V/V configurations with predictable AC response |
| Input voltage noise | 1.8nV/√Hz (>200Hz) - preserves SNR in high-gain, low-level analog front-ends |
| Quiescent current | 950µA (typical) - supports <3mW operation at 3V, ideal for portable sensing |
| Small-signal bandwidth | 90MHz at G = 6V/V - sufficient for >10MHz baseband signals in ADC drivers |
| Input offset voltage | ±125µV (max, 25°C) - minimizes dc error in precision transimpedance designs |
| Power-down current | <1µA - enables duty-cycled operation without external switch control |
| Supply range | 2.7V to 5.4V single supply - compatible with Li-ion and regulated 3.3V systems |
Pinout & Package
OPA838SIDCKT is packaged in a 5-pin SC70 (DCK) package measuring 2.0mm × 1.25mm, optimized for space-constrained PCB layouts. The device features a compact footprint with exposed pad thermal enhancement.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| VIN+ | Noninverting input | Accepts signal referenced to negative rail; supports CM range down to VS– |
| VIN− | Inverting input | Feedback node for closed-loop configurations; matched impedance critical for noise performance |
| VOUT | Amplifier output | Rail-to-rail swing (VS– + 0.05V to VS+ – 0.1V); drives 2kΩ load with <0.02Ω DC impedance |
| VS+ | Positive supply | Connects to 2.7–5.4V source; bypass with 0.1µF ceramic near pin |
| VS− | Negative supply / ground | Reference for single-supply operation; must be low-impedance return path |
Key Features
| Feature | Design Value |
|---|---|
| Negative-rail input with rail-to-rail output | Enables true dc-coupled operation from ground-referenced sensors without level-shifting circuitry |
| Trimmed 950µA supply current | Reduces thermal drift and PCB self-heating in high-density analog sections |
| 1.8nV/√Hz input voltage noise | Supports >100dB dynamic range in photodiode TIA designs with 100kΩ–1MΩ feedback |
| Integrated power-down pin | Reduces system standby power by >99.9% without external MOSFET or sequencing logic |
| 0.1-dB flatness bandwidth | 10MHz at G = 6V/V - ensures amplitude fidelity across medical ultrasound receive bands |
Applications
| Low-Power Transimpedance Amplifier | 12–16-Bit SAR ADC Driver |
|---|---|
Use Scenario: Amplifying weak current from photodiodes or avalanche photodiodes in portable pulse oximeters. IC Role / Device Role / Timing Role: Primary transimpedance gain stage with dc-coupled feedback, operating at G = 1000V/V. Use Value: Delivers 300kHz signal bandwidth and ±125mV max output offset - enabling direct connection to 16-bit ADCs without ac-coupling or trimming. | Use Scenario: Driving the input of precision successive-approximation ADCs in battery-powered data loggers. IC Role / Device Role / Timing Role: High-speed, low-noise buffer with fast settling (<40ns to 0.01%) and minimal THD. Use Value: Maintains ENOB >14.5 bits at 100kHz with –120dBc HD3, eliminating need for external RC filtering before ADC sampling. |
| Ultrasonic Flow Meter Front-End | High-Gain Active Filter Design |
Use Scenario: Conditioning echo signals in time-of-flight ultrasonic flow sensors with 1–2MHz carrier. IC Role / Device Role / Timing Role: First-stage gain and anti-alias filtering in differential receiver chain. Use Value: 90MHz bandwidth and 1.8nV/√Hz noise support >100dB SNR at 1MHz, improving flow resolution below ±0.1%. | Use Scenario: Implementing 4th-order low-pass filters for ECG or sensor signal conditioning. IC Role / Device Role / Timing Role: Unity-gain-stable op-amp configured as multiple feedback (MFB) or state-variable topology. Use Value: Stable at G = 1 with <0.5dB passband ripple up to 10MHz - enabling sharp cutoff without peaking artifacts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage-feedback op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA837 | 50MHz GBP, 0.625mA IQ, 4.7nV/√Hz input noise | Lower bandwidth and higher noise - suitable for <5MHz, lower-gain stages | Select when power budget is tighter (<0.65mA) and noise floor >4nV/√Hz is acceptable |
| OPA836 | 110MHz GBP, 1mA IQ, 4.8nV/√Hz input noise | Higher supply current and noise, but unity-gain stable | Choose for G = 1–2 applications where decompensation constraints are unacceptable |
Compared with OPA837 and OPA836, the OPA838SIDCKT provides the lowest input voltage noise and highest GBP per µA - making it uniquely suited for high-gain, low-power, wideband signal chains where SNR and bandwidth efficiency are prioritized over unity-gain stability.
Availability
OPA838SIDCKT is available at Aetrix Electronics and suitable for low-power instrumentation, portable medical devices, and ultrasonic sensing applications requiring stable component supply, full production traceability, and long-term lifecycle support.
Supply support for OPA838SIDCKT 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 delivering analog and embedded processing solutions for industrial, automotive, and personal electronics markets.
The OPA838SIDCKT belongs to TI's high-speed, low-power operational amplifier portfolio - designed specifically for precision, battery-operated signal acquisition systems where input noise, supply current, and bandwidth must be simultaneously optimized.
FAQ
What is the minimum stable gain for OPA838SIDCKT?
The OPA838SIDCKT is decompensated and requires a minimum noninverting gain of 6V/V for stable operation. At this gain, it achieves 90MHz –3dB bandwidth with <4dB peaking. Using lower gains risks oscillation and must be avoided unless external compensation is applied per TI's application notes.
Does OPA838SIDCKT support rail-to-rail input?
No - OPA838SIDCKT features negative-rail input (CM range extends to VS–) but not rail-to-rail input. Its common-mode high limit is VS+ – 1.3V (min), so it cannot accept inputs within ~1.3V of the positive rail. This is intentional to optimize input stage noise and offset performance.
What is the power-down behavior of OPA838SIDCKT?
When the PD pin is driven below 0.55V (VS– + 0.55V), OPA838SIDCKT enters shutdown mode with quiescent current <1µA. Output becomes high-impedance. Turn-off delay is 100ns; turn-on delay is 3.5µs (at 3V supply). The PD pin must be actively driven - floating is undefined.
Can OPA838SIDCKT drive a 50Ω load directly?
OPA838SIDCKT is not specified for continuous 50Ω driving. Its linear output current is ±25mA (typical), supporting ≤70.6Ω loads at 3V. For 50Ω, use an external buffer or series resistor to limit current and avoid distortion or thermal stress. TI recommends RL ≥ 100Ω for full-spec operation.
How does OPA838SIDCKT perform at 3V supply versus 5V?
At 3V, OPA838SIDCKT maintains 86MHz SSBW (vs. 90MHz at 5V), 45MHz LSBW, and 930µA IQ (vs. 960µA). Input offset remains ±125µV max, and noise stays at 1.8nV/√Hz. All key specs are fully characterized down to 2.7V, confirming robust low-voltage operation for Li-ion and energy-harvesting systems.
OPA838SIDCKT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 6-TSSOP, SC-88, SOT-363
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- Voltage Feedback
- Number of Circuits:
- 1
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 350V/µs
- Gain Bandwidth Product:
- 300 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 1.5 µA
- Voltage - Input Offset:
- 15 µV
- Current - Supply:
- 960µA
- Current - Output / Channel:
- -
- Voltage - Supply Span (Min):
- 2.7 V
- Voltage - Supply Span (Max):
- 5.4 V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-6
OPA838SIDCKT FAQ
1.How can I place an order for OPA838SIDCKT through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA838SIDCKT 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 OPA838SIDCKT reliable?
The price and inventory of OPA838SIDCKT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA838SIDCKT is usually 5 days.
3.What payment methods are accepted for OPA838SIDCKT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA838SIDCKT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA838SIDCKT?
OPA838SIDCKT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA838SIDCKT 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 OPA838SIDCKT?
For technical support, including OPA838SIDCKT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA838SIDCKT requirements.
6.How does Aetrix verify that OPA838SIDCKT is sourced from the original manufacturer or authorized distributors?
All OPA838SIDCKT 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 OPA838SIDCKT meets industry standards.
7.What is the process for return or replacement of OPA838SIDCKT?
All OPA838SIDCKT units undergo pre-shipment inspection (PSI). If there is an issue with OPA838SIDCKT, 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 OPA838SIDCKT part is unused and in its original packaging.
Return procedure for OPA838SIDCKT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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