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Texas Instruments OPA838IDCKT
- Part No.:
- OPA838IDCKT
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
OPA838IDCKT.pdf
- Description:
- IC OPAMP VFB 1 CIRCUIT SC70-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,614
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Product details
Overview
OPA838IDCKT 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.
For engineers reviewing the OPA838IDCKT datasheet, OPA838IDCKT pinout, OPA838IDCKT application, or OPA838IDCKT equivalent, this page provides verified technical context, package-specific pin functions, real-world application mappings, and validated alternative options for low-power, high-bandwidth analog front-end design.
Technical Context
The OPA838IDCKT uses a decompensated voltage-feedback architecture requiring minimum noninverting gain of 6V/V to ensure stability, yielding 90MHz –3dB bandwidth at that gain. Its negative-rail input enables dc-coupled operation down to VS–, while rail-to-rail output supports full dynamic range utilization in low-voltage systems.
Integrated power-down (PD) functionality reduces quiescent current to <1µA, with fast 3.5µs turn-on and 100ns turn-off timing. Input offset voltage is trimmed to ±125µV max at 25°C, and drift is limited to ±1.6µV/°C over –40°C to +125°C - critical for stable high-gain dc-coupled stages.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-bandwidth product | 300MHz - enables stable 6V/V gain with 90MHz bandwidth, supporting high-frequency sensor signal amplification |
| Input voltage noise | 1.8nV/√Hz (>200Hz) - ultra-low noise essential for photodiode transimpedance and weak-signal amplification |
| Quiescent current | 950µA (typical) - achieves high speed and low noise at sub-1mA power, ideal for battery-powered instrumentation |
| Supply range | 2.7V to 5.4V single supply - simplifies power architecture in portable and industrial 3.3V/5V systems |
| Input offset voltage | ±125µV max at 25°C - ensures minimal dc error in precision gain stages up to 1000V/V |
| Power-down current | <1µA - enables rapid, low-leakage sleep mode for duty-cycled sensing applications |
| Small-signal bandwidth | 90MHz at G = 6V/V - supports wideband filtering, ultrasound receive chains, and fast-settling data acquisition |
Pinout & Package
The OPA838IDCKT is packaged in a 5-pin SC70 (DCK) measuring 2.0mm × 1.25mm, optimized for space-constrained PCB layouts while maintaining thermal performance via exposed pad variants (not applicable to DCK). This compact package supports high-density analog front-end integration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN+ | Noninverting input | High-impedance node for reference or signal input; supports negative-rail common-mode down to VS– |
| VIN− | Inverting input | Feedback node for transimpedance or inverting gain configurations; matched to VIN+ for CMRR >95dB |
| VOUT | Amplifier output | Rail-to-rail output capable of driving 2kΩ loads with <0.1% settling in 30ns at 2V step |
| VS+ | Positive supply | Accepts 2.7V–5.4V; PSRR >95dB minimizes supply ripple coupling into signal path |
| VS− | Negative supply / ground | Reference for single-supply operation; input common-mode extends to VS− −0.2V |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low input voltage noise | 1.8nV/√Hz enables sub-picoamp current detection in photodiode TIA designs without compromising bandwidth |
| Trimmed input offset voltage | ±125µV max at 25°C ensures dc accuracy in 12–16-bit SAR ADC driver stages without external trimming |
| Single-supply rail-to-rail output | Swings within 100mV of rails at 25°C, maximizing dynamic range in 3.3V systems with minimal headroom loss |
| Fast power-down control | 100ns turn-off and 3.5µs turn-on enable microsecond-level power gating for burst-mode signal acquisition |
| Stable at G ≥ 6V/V | Decompensated design avoids external compensation components, reducing BOM count and layout sensitivity |
Applications
| Low-Power Transimpedance Amplifier | 12–16-Bit SAR ADC Driver |
|---|---|
Use Scenario: Amplifying weak photocurrents from large-area photodiodes (e.g., 100pF capacitance) in optical flow meters or spectrophotometers. IC Role / Device Role / Timing Role: Primary transimpedance stage with 100kΩ feedback, operating at 3V supply with <1.1pA/√Hz total input-referred current noise. Use Value: Enables 1MHz small-signal bandwidth at 100kΩ gain while consuming <3mW - critical for portable optical sensors. | Use Scenario: Driving the input of 12–16-bit successive-approximation register (SAR) ADCs in portable data loggers and medical monitors. IC Role / Device Role / Timing Role: High-fidelity buffer and gain stage with 300kHz signal bandwidth at dc-coupled gain of 1000V/V and ±125mV max output offset. Use Value: Maintains SNR integrity through low distortion (HD3 = –125dBc @ 100kHz) and fast settling (40ns to 0.01%) for high-resolution sampling. |
| Ultrasonic Flow Meter Front-End | High-Gain Active Filter Design |
Use Scenario: Conditioning echo signals in time-of-flight ultrasonic flow measurement systems with narrow pulse widths and high frequency content. IC Role / Device Role / Timing Role: First-stage amplifier in receive chain, providing 45MHz large-signal bandwidth (4VPP) and 250V/µs slew rate for clean pulse fidelity. Use Value: Preserves leading-edge integrity of µs-scale ultrasonic pulses while rejecting supply noise via 95dB PSRR. | Use Scenario: Implementing 4th-order active filters in anti-aliasing or channel-select applications where phase linearity and group delay stability are critical. IC Role / Device Role / Timing Role: High-Q, low-noise gain block in multiple-feedback (MFB) or state-variable topologies operating up to 10MHz. Use Value: Delivers flat 0.1dB bandwidth of 10MHz at G = 6V/V and low harmonic distortion (<–110dBc), ensuring filter response accuracy. |
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 |
|---|---|---|---|
| OPA836IDBVR | 110MHz GBP, 4.8nV/√Hz input noise, 1mA IQ, stable at G ≥ 5V/V | Lower bandwidth and higher noise limit use in >50MHz photodiode TIAs or >12-bit ADC drivers | Preferred when lower cost and relaxed noise/bandwidth requirements allow trade-off against OPA838IDCKT's 300MHz/1.8nV performance |
| OPA837IDCKR | 50MHz GBP, 4.7nV/√Hz input noise, 0.625mA IQ, stable at G ≥ 1V/V | Unity-gain stable but insufficient bandwidth/noise performance for >10MHz signal paths or precision TIAs | Selected for general-purpose low-power amplification where unity-gain stability is mandatory and 300MHz capability is unnecessary |
Compared with OPA838IDCKT, OPA836IDBVR offers lower cost and adequate performance for mid-bandwidth instrumentation, while OPA837IDCKR provides unity-gain stability at the expense of bandwidth and noise - making OPA838IDCKT the only option among the three meeting simultaneous 300MHz GBW and 1.8nV/√Hz noise targets.
Availability
OPA838IDCKT is available at Aetrix Electronics and suitable for low-power transimpedance amplifiers, 12–16-bit SAR ADC drivers, ultrasonic flow meter front-ends, and high-gain active filter designs requiring stable component supply across industrial, medical, and test equipment programs.
Supply support for OPA838IDCKT 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 high-performance op amps and precision signal-chain solutions.
The OPA838IDCKT belongs to TI's high-speed, low-noise voltage-feedback op amp product line, engineered specifically for power-constrained, wideband analog front-ends in optical sensing, medical instrumentation, and high-resolution data acquisition.
FAQ
What is the minimum stable gain for OPA838IDCKT?
The OPA838IDCKT is decompensated and requires a minimum noninverting gain of 6V/V for stable operation. At this gain, it achieves 90MHz –3dB bandwidth and maintains phase margin sufficient for robust closed-loop performance. Using lower gains risks oscillation and must be avoided unless external compensation is applied per TI's application guidance.
Does OPA838IDCKT support rail-to-rail input?
No - the OPA838IDCKT features negative-rail input (common-mode range extends to VS– – 0.2V) but not rail-to-rail input. The high-side common-mode limit is VS+ – 1.3V. This architecture optimizes input stage noise and offset while enabling true dc-coupled operation near ground - ideal for single-supply photodiode TIAs where the inverting input is held at midsupply or virtual ground.
What is the power-down behavior of OPA838IDCKT?
When the PD pin is driven below VS– + 0.55V, the OPA838IDCKT enters shutdown mode with quiescent current reduced to ≤1µA. Output becomes high-impedance. Turn-off delay is 100ns; turn-on delay (to 90% of final output) is 3.5µs. The PD pin must be actively driven - floating is undefined and may cause erratic operation.
Can OPA838IDCKT drive heavy capacitive loads?
The OPA838IDCKT is not optimized for direct capacitive load driving. Its typical closed-loop output impedance is 0.3Ω at 1MHz, but stability degrades with >100pF capacitive loads without isolation resistance. For ADC input driving or cable transmission, TI recommends using a series resistor (e.g., 10–50Ω) between OPA838IDCKT output and the capacitive load to maintain phase margin and prevent peaking or oscillation.
What package variants does OPA838IDCKT have, and which one is this?
The OPA838IDCKT uses the 5-pin SC70 (DCK) package, measuring 2.0mm × 1.25mm. This variant omits the power-down (PD) pin present in the 6-pin SOT-23 (DBV) and 6-pin SC70 (DCK) versions, simplifying routing in space-constrained layouts where always-on operation is acceptable. Pinout is VIN+, VIN−, VOUT, VS+, and VS− - no NC or PD pins.
OPA838IDCKT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 5-TSSOP, SC-70-5, SOT-353
- 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-70-5
OPA838IDCKT FAQ
1.How can I place an order for OPA838IDCKT through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA838IDCKT 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 OPA838IDCKT reliable?
The price and inventory of OPA838IDCKT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA838IDCKT is usually 5 days.
3.What payment methods are accepted for OPA838IDCKT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA838IDCKT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA838IDCKT?
OPA838IDCKT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA838IDCKT 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 OPA838IDCKT?
For technical support, including OPA838IDCKT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA838IDCKT requirements.
6.How does Aetrix verify that OPA838IDCKT is sourced from the original manufacturer or authorized distributors?
All OPA838IDCKT 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 OPA838IDCKT meets industry standards.
7.What is the process for return or replacement of OPA838IDCKT?
All OPA838IDCKT units undergo pre-shipment inspection (PSI). If there is an issue with OPA838IDCKT, 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 OPA838IDCKT part is unused and in its original packaging.
Return procedure for OPA838IDCKT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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