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Texas Instruments OPA838SIDCKR
- Part No.:
- OPA838SIDCKR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 6-TSSOP, SC-88, SOT-363
- Datasheet:
-
OPA838SIDCKR.pdf
- Description:
- IC OPAMP VFB 1 CIRCUIT SC70-6
- Quantity:
- Payment:
- Shipping:
Inventory:3,476
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Product details
Overview
OPA838SIDCKR from Texas Instruments is a decompensated voltage-feedback operational amplifier optimized for low-noise, high-gain signal conditioning in photodiode transimpedance and precision ADC driver applications. It delivers 300MHz gain-bandwidth product, 1.8nV/√Hz input voltage noise, 950µA quiescent current, and rail-to-rail output swing on a 2.7V–5.4V single supply - enabling high-fidelity amplification in battery-powered ultrasonic flow meters and portable medical sensors.
For engineers reviewing the OPA838SIDCKR datasheet, OPA838SIDCKR pinout, OPA838SIDCKR application, or OPA838SIDCKR equivalent, key selection criteria include its 90MHz small-signal bandwidth at G = 6V/V, ±125µV max input offset voltage at 25°C, negative-rail input capability, shutdown pin functionality, and verified performance in dc-coupled gains up to 1000V/V with 300kHz signal bandwidth.
Technical Context
The OPA838SIDCKR employs a decompensated architecture requiring minimum noninverting gain of 6V/V for stability, yielding 90MHz –3dB bandwidth at 5V supply. Its input stage features negative-rail input capability and ultra-low 1.8nV/√Hz voltage noise above 200Hz, paired with 1pA/√Hz current noise above 2kHz - making it suitable for high-impedance sensor interfaces where Johnson noise dominates.
Power-down control is implemented via a dedicated PD pin (pin 5 in SC70-6 package), with logic thresholds referenced to VS– (enable > VS– + 1.5V, disable < VS– + 0.55V) and sub-1µA shutdown current. The device maintains rail-to-rail output swing while supporting ±20mA linear output current into 70.6Ω loads at 25°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-bandwidth product | 300MHz - enables stable operation at G ≥ 6V/V with 90MHz usable bandwidth |
| Input voltage noise | 1.8nV/√Hz (>200Hz) - critical for preserving SNR in photodiode and piezoelectric sensor front-ends |
| Quiescent current | 950µA (typical) - supports <3mW total power at 3V supply in portable instrumentation |
| Input offset voltage | ±125µV (max at 25°C) - ensures <±125mV output offset at dc-coupled G = 1000V/V |
| Small-signal bandwidth | 90MHz at G = 6V/V - provides sufficient margin for 12–16-bit SAR ADC sampling at 10–20MSPS |
| Supply range | 2.7V to 5.4V single supply - compatible with Li-ion, USB, and industrial 3.3V systems |
| Shutdown current | <1µA - enables micro-power sleep modes without external disconnect circuitry |
Pinout & Package
The OPA838SIDCKR is packaged in a 6-pin SC70 (DCK) measuring 2.0mm × 1.5mm, with exposed pad for thermal enhancement. Pin 1 is VOUT; pin 2 is VS–; pin 3 is VS+; pin 4 is VIN+; pin 5 is PD (power-down control); pin 6 is VIN–.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VOUT (Pin 1) | Amplifier output | Rail-to-rail capable, drives 2kΩ load with <0.02Ω DC output impedance |
| VS– (Pin 2) | Negative supply | Ground reference for single-supply operation; supports negative-rail input common-mode range |
| VS+ (Pin 3) | Positive supply | Accepts 2.7V–5.4V; PSRR >93dB ensures immunity to supply ripple |
| VIN+ (Pin 4) | Noninverting input | Differential input impedance 30kΩ || 1.3pF; CMRR >95dB minimizes common-mode error |
| PD (Pin 5) | Power-down enable | CMOS-compatible input; drives <50nA bias current; turn-off delay <100ns |
| VIN– (Pin 6) | Inverting input | Supports precision feedback networks; input bias current <2.8µA (max) at 125°C |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low input voltage noise | 1.8nV/√Hz enables high-SNR amplification of weak photodiode currents without added Johnson noise penalty |
| Trimmed quiescent current | 950µA typical allows full 300MHz GBP operation within 3mW power budget at 3V |
| Negative-rail input + RRO output | Enables true dc-coupled signal chain from ground-referenced sensors to ADC inputs without level-shifting |
| Integrated shutdown control | Sub-1µA quiescent current in shutdown mode eliminates need for external power gating MOSFETs |
| Stable at G ≥ 6V/V | Decompensated design reduces internal capacitance, maximizing bandwidth-per-milliamp efficiency |
Applications
| Low-Power Transimpedance Amplifier | 12–16-Bit SAR ADC Driver |
|---|---|
Use Scenario: Amplifying nanoamp-level photocurrent from large-area photodiodes (100pF capacitance) in portable gas analyzers. IC Role / Device Role / Timing Role: Primary transimpedance stage with 100kΩ feedback resistor and 1MHz SSBW. Use Value: 1.8nV/√Hz input noise and <1.1pA/√Hz total input-referred current noise preserve dynamic range at low-light conditions. | Use Scenario: Driving the input of 16-bit SAR ADCs (e.g., ADS8860) in handheld test equipment with 100kSPS throughput. IC Role / Device Role / Timing Role: High-gain, low-distortion buffer with 0.1-dB flatness up to 10MHz at G = 6V/V. Use Value: HD2/HD3 < –110dBc at 100kHz ensures no harmonic folding into ADC Nyquist band. |
| Ultrasonic Flow Meter Front-End | High-Gain Active Filter Design |
Use Scenario: Conditioning echo signals from piezoelectric transducers operating at 1–2MHz in clamp-on flow sensors. IC Role / Device Role / Timing Role: First-stage gain block with 45MHz large-signal bandwidth for 4VPP pulses. Use Value: 350V/µs slew rate and 40ns settling to 0.01% support accurate time-of-flight measurement. | Use Scenario: Implementing 4th-order Butterworth anti-aliasing filters in data acquisition modules with 100kHz cutoff. IC Role / Device Role / Timing Role: High-Q active filter section using G = 100 configuration with 300kHz signal bandwidth. Use Value: ±125µV max input offset limits DC error accumulation across cascaded filter stages. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed, low-noise op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA836IDCKR | 110MHz GBP, 4.8nV/√Hz input noise, 1mA IQ, no shutdown pin | Lacks power-down feature; higher noise limits use in ultra-low-light photodiode apps | Select when lower cost and absence of shutdown is acceptable in fixed-power systems |
| OPA837IDCKR | 50MHz GBP, 4.7nV/√Hz input noise, 625µA IQ, rail-to-rail input/output | Lower bandwidth and higher noise; includes full rail-to-rail input (vs. OPA838's negative-rail only) | Prefer for general-purpose low-power buffering where 50MHz BW suffices and input common-mode range must span full supply |
Compared with OPA836IDCKR and OPA837IDCKR, the OPA838SIDCKR uniquely combines 300MHz GBP, 1.8nV/√Hz noise, and integrated shutdown in a 2mm × 1.5mm SC70 package - making it the only option among the three for battery-operated, high-resolution transimpedance designs demanding both speed and sub-milliwatt operation.
Availability
OPA838SIDCKR is available at Aetrix Electronics and suitable for ultrasonic flow meter front-ends, portable medical sensor interfaces, and low-power precision data acquisition systems requiring stable component supply across extended temperature ranges (–40°C to +125°C).
Supply support for OPA838SIDCKR 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, delivering analog and embedded processing solutions for industrial, automotive, and personal electronics markets.
The OPA838 forms part of TI's high-speed, low-noise operational amplifier portfolio designed specifically for precision signal conditioning in photodiode, piezoelectric, and SAR ADC interface applications where bandwidth, noise, and power efficiency are co-optimized.
FAQ
What is the minimum stable gain for OPA838SIDCKR?
The OPA838SIDCKR is decompensated and requires a minimum noninverting gain of 6V/V for stable operation. At this gain, it achieves 90MHz small-signal bandwidth with <4dB peaking. Using lower gains risks oscillation and must be avoided unless external compensation is applied per TI's application notes.
Does OPA838SIDCKR support rail-to-rail input?
No - the OPA838SIDCKR features negative-rail input (common-mode range extends to VS–) but not full rail-to-rail input. Its positive common-mode limit is VS+ – 1.3V at 25°C. For full rail-to-rail input capability, consider alternatives like OPA837IDCKR, though at reduced bandwidth and higher noise.
What is the power-down behavior of OPA838SIDCKR?
When the PD pin (pin 5) is driven below VS– + 0.55V, the OPA838SIDCKR enters shutdown mode with quiescent current dropping to <1µA. Turn-off delay is <100ns; turn-on delay is 3.5µs (at 3V supply). The output becomes high-impedance during shutdown, preventing loading of downstream circuitry.
Can OPA838SIDCKR drive capacitive loads directly?
The OPA838SIDCKR is not unity-gain stable and is not characterized for direct capacitive load driving. For loads >100pF, TI recommends isolating the output with a series resistor (e.g., 10–50Ω) or using a dedicated buffer stage. Layout best practices (short traces, local bypassing) are essential to maintain stability in high-frequency applications.
What package variants does OPA838SIDCKR correspond to?
OPA838SIDCKR specifically denotes the 6-pin SC70 (DCK) package with 2.0mm × 1.5mm footprint and exposed thermal pad. It is distinct from OPA838SIDBVR (SOT-23-6) and OPA838SIDXBR (X2QFN-8); pinout and thermal performance differ across variants - always verify package drawings before PCB layout.
OPA838SIDCKR 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
OPA838SIDCKR FAQ
1.How can I place an order for OPA838SIDCKR through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA838SIDCKR 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 OPA838SIDCKR reliable?
The price and inventory of OPA838SIDCKR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA838SIDCKR is usually 5 days.
3.What payment methods are accepted for OPA838SIDCKR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA838SIDCKR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA838SIDCKR?
OPA838SIDCKR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA838SIDCKR 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 OPA838SIDCKR?
For technical support, including OPA838SIDCKR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA838SIDCKR requirements.
6.How does Aetrix verify that OPA838SIDCKR is sourced from the original manufacturer or authorized distributors?
All OPA838SIDCKR 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 OPA838SIDCKR meets industry standards.
7.What is the process for return or replacement of OPA838SIDCKR?
All OPA838SIDCKR units undergo pre-shipment inspection (PSI). If there is an issue with OPA838SIDCKR, 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 OPA838SIDCKR part is unused and in its original packaging.
Return procedure for OPA838SIDCKR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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