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Texas Instruments OPA842IDBVT
- Part No.:
- OPA842IDBVT
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SC-74A, SOT-753
- Datasheet:
-
OPA842IDBVT.pdf
- Description:
- IC OPAMP VFB 1 CIRCUIT SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,344
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Product details
Overview
OPA842IDBVT from Texas Instruments is a unity-gain stable, voltage-feedback operational amplifier optimized for high-speed, low-distortion signal conditioning in precision analog front-ends. It delivers 400MHz unity-gain bandwidth, 2.6nV/√Hz input voltage noise, –93dBc third-harmonic distortion at 5MHz, and 22ns 0.01% settling time - enabling high-fidelity buffering of 14-bit ADCs like the ADS850 in data acquisition systems.
For engineers reviewing the OPA842IDBVT datasheet, OPA842IDBVT pinout, OPA842IDBVT application, or OPA842IDBVT equivalent, this page provides verified technical context, SOT-23-5 package details, real-world differential gain/phase performance (0.003%/0.008°), and validated alternatives for ADC driver, IF amplifier, and active filter designs requiring >100MHz small-signal bandwidth and <–90dBc distortion.
Technical Context
The OPA842IDBVT employs a two-stage voltage-feedback architecture with classic differential input, delivering unity-gain stability without external compensation while maintaining 200MHz gain-bandwidth product and 110dB open-loop gain. Its design enables precise dc accuracy (±0.3mV offset) alongside wideband ac performance - including 150MHz closed-loop bandwidth at G = +2 and 56MHz 0.1dB gain flatness.
It achieves professional-grade video performance (0.003% differential gain, 0.008° phase error) under NTSC conditions with 150Ω load, and supports robust output drive (±100mA) into 100Ω loads while maintaining 2.3ns rise time and 400V/μs slew rate. Thermal resistance is 150°C/W (Junction-to-Ambient, SOT-23-5).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Unity-Gain Bandwidth | 400MHz - enables stable G = +1 operation with full small-signal bandwidth for direct ADC input buffering. |
| Gain-Bandwidth Product | 200MHz - defines maximum usable bandwidth at higher gains (e.g., 45MHz at G = +5). |
| Input Voltage Noise | 2.6nV/√Hz - ensures minimal added noise in low-level signal amplification, critical for 14-bit dynamic range preservation. |
| Harmonic Distortion | –93dBc (3rd harmonic, 5MHz, 2VPP, RL = 500Ω) - meets professional audio and imaging linearity requirements. |
| Settling Time (0.01%) | 22ns - supports accurate sampling of fast transients in 10MSPS+ data converters like ADS850. |
| Supply Voltage Range | ±3.5V to ±6V - compatible with standard ±5V rails and tolerant of transient overvoltage conditions. |
| Quiescent Current | 20.2mA (typ, ±5V) - balances speed and power efficiency for portable or thermally constrained designs. |
Pinout & Package
SOT-23-5 package (DBV), 5-pin surface-mount, 1.6mm × 2.9mm footprint, thermal pad not present. Pin 1 marked by dot; pin orientation per TI SBOS267D datasheet Figure 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (IN–) | Inverting Input | Differential input node; requires matched impedance for bias current cancellation in precision applications. |
| 2 (IN+) | Noninverting Input | Differential input node; dc path required - e.g., via resistor to ground when driving from ac-coupled source. |
| 3 (OUT) | Output | Capable of ±100mA sourcing/sinking into 1kΩ; requires series isolation resistor when driving capacitive ADC inputs. |
| 4 (–VS) | Negative Supply | Connect to clean –5V rail; decoupling capacitor (0.1μF) mandatory near pin for low-distortion operation. |
| 5 (+VS) | Positive Supply | Connect to clean +5V rail; separate 0.1μF ceramic + 2.2μF tantalum decoupling recommended. |
Key Features
| Feature | Design Value |
|---|---|
| Unity-Gain Stability | Operates stably at G = +1 without external compensation - simplifies layout and eliminates risk of oscillation in buffer configurations. |
| Professional Video Performance | 0.003% differential gain / 0.008° differential phase error with 150Ω load - qualifies for broadcast-quality composite video line driving. |
| High Output Drive | ±100mA output current into 1kΩ - drives heavy loads (e.g., 75Ω video cables, parallel ADC inputs) without gain compression. |
| Low DC Offset Drift | ±4μV/°C max average offset drift - maintains accuracy across industrial temperature range (–40°C to +85°C). |
| Wide Common-Mode Range | ±3.2V (min, TA = +25°C) - supports rail-to-rail input signal swing with ±5V supplies in ac-coupled front-ends. |
Applications
| ADC Buffer Driver | IF Amplifier |
|---|---|
Use Scenario: Driving the analog input of a 14-bit, 10MSPS SAR ADC (e.g., ADS850) with ac-coupled signal referenced to internal VREF. IC Role / Device Role / Timing Role: High-speed, low-noise, low-distortion buffer that preserves SFDR and minimizes aperture jitter-induced errors. Use Value: Achieves >92dB SFDR at 5MHz, enabling full utilization of ADS850's 14-bit resolution without degrading ENOB. |
Use Scenario: Amplifying intermediate-frequency signals (1–50MHz) in communications receivers before demodulation. IC Role / Device Role / Timing Role: Low-distortion, wideband gain block with flat frequency response up to 56MHz (0.1dB gain flatness at G = +2). Use Value: Delivers –93dBc 3rd-harmonic distortion at 5MHz, supporting high-order modulation schemes (e.g., 256-QAM) without spectral regrowth. |
| Active Filter Configuration | Low-Noise Differential Receiver |
Use Scenario: Implementing 2nd-order Sallen-Key or MFB bandpass filters for anti-aliasing or channel selection in test instrumentation. IC Role / Device Role / Timing Role: Precision gain stage with 110dB open-loop gain and 200MHz GBP - ensures accurate pole placement and minimal passband ripple. Use Value: Maintains <0.01dB gain flatness over 10MHz bandwidth, critical for calibrated measurement systems. |
Use Scenario: Converting single-ended sensor outputs (e.g., piezoelectric, bridge) to low-noise differential signals for ADC input. IC Role / Device Role / Timing Role: Single-op-amp differential amplifier with 85dB CMRR (typ) and matched RF/RG network for common-mode rejection. Use Value: Rejects >85dB of EMI/RFI coupled onto long sensor cables while preserving small-signal integrity down to microvolt levels. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA843IDBVT | Lower input voltage noise (2.0nV/√Hz), higher GBW (800MHz), but only stable ≥G = +3. | Requires minimum gain of +3; unsuitable for unity-gain ADC buffers where OPA842IDBVT excels. | Select OPA843IDBVT only when gain ≥+3 is acceptable and sub-2.5nV/√Hz noise is critical. |
| OPA847IDBVT | Ultra-low noise (0.8nV/√Hz), 3.7GHz GBW, but unstable below G = +10 and higher quiescent current (32mA). | Not unity-gain stable; incompatible with G = +1 or G = +2 video/ADC buffer topologies used with OPA842IDBVT. | Choose OPA847IDBVT only for high-gain, narrowband RF/IF stages where noise dominates and stability constraints are met. |
Compared with OPA842IDBVT, OPA843IDBVT offers superior noise and bandwidth but sacrifices unity-gain stability, while OPA847IDBVT delivers best-in-class noise at the cost of unusable gain range and higher power - making OPA842IDBVT the optimal choice for G = +1/+2 precision buffer applications demanding both stability and dynamic range.
Availability
OPA842IDBVT is available at Aetrix Electronics and suitable for high-speed data acquisition, professional video infrastructure, and test instrumentation requiring stable component supply, guaranteed traceability, and long-term industrial lifecycle support.
Supply support for OPA842IDBVT 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 focused on analog and embedded processing technologies, with decades of expertise in high-performance op amps and precision signal chain solutions.
The OPA842IDBVT belongs to TI's OPAx84x family of ultra-wideband, low-distortion op amps designed specifically for demanding analog front-end applications including ADC/DAC buffering, IF amplification, and professional video signal conditioning.
FAQ
What is the maximum operating supply voltage for OPA842IDBVT?
The OPA842IDBVT supports a maximum operating supply voltage of ±6V (12V total). Absolute maximum ratings specify ±6.5V, but functional operation is guaranteed only up to ±6V per the datasheet's specified operating voltage range. Exceeding ±6V risks parametric degradation or permanent damage, especially under transient conditions.
Does OPA842IDBVT require external compensation for unity-gain stability?
No, the OPA842IDBVT is internally compensated for unity-gain stability. It operates stably with closed-loop gains from +1 to +10 without external components. This eliminates the need for feedback capacitors or gain-setting networks solely for stability - a key advantage over current-feedback or uncompensated voltage-feedback op amps.
Can OPA842IDBVT drive a 75Ω video cable directly?
Yes, the OPA842IDBVT can drive a 75Ω video cable directly in a gain-of-two configuration (e.g., RG = 335Ω, RF = 402Ω), compensating for the 6dB loss of the 75Ω source/load divider. It delivers 0.003% differential gain and 0.008° differential phase error under NTSC conditions, meeting broadcast video specifications without additional equalization.
What is the recommended series resistor when using OPA842IDBVT to drive an ADC input?
For driving CMOS ADCs like the ADS850, a series isolation resistor (RS) between OPA842IDBVT output and ADC input is mandatory to prevent peaking. The value depends on ADC input capacitance; TI's Figure 15 recommends 200Ω for 10pF, 100Ω for 22pF, and 50Ω for 47pF. Always verify empirically with step-response testing.
Is OPA842IDBVT pin-compatible with OPA642?
No, OPA842IDBVT is not pin-compatible with OPA642. While both are high-speed voltage-feedback op amps, OPA642 uses SO-8 (D) or MSOP-8 (DGK) packages with 8 pins, whereas OPA842IDBVT uses SOT-23-5 (DBV) with 5 pins and different pin assignments (e.g., no enable or shutdown pin). PCB redesign is required for substitution.
OPA842IDBVT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- Voltage Feedback
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 400V/µs
- Gain Bandwidth Product:
- 200 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 20 µA
- Voltage - Input Offset:
- 300 µV
- Current - Supply:
- 20.2mA
- Current - Output / Channel:
- 100 mA
- Voltage - Supply Span (Min):
- 10 V
- Voltage - Supply Span (Max):
- 12 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
OPA842IDBVT FAQ
1.How can I place an order for OPA842IDBVT through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA842IDBVT 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 OPA842IDBVT reliable?
The price and inventory of OPA842IDBVT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA842IDBVT is usually 5 days.
3.What payment methods are accepted for OPA842IDBVT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA842IDBVT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA842IDBVT?
OPA842IDBVT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA842IDBVT 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 OPA842IDBVT?
For technical support, including OPA842IDBVT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA842IDBVT requirements.
6.How does Aetrix verify that OPA842IDBVT is sourced from the original manufacturer or authorized distributors?
All OPA842IDBVT 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 OPA842IDBVT meets industry standards.
7.What is the process for return or replacement of OPA842IDBVT?
All OPA842IDBVT units undergo pre-shipment inspection (PSI). If there is an issue with OPA842IDBVT, 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 OPA842IDBVT part is unused and in its original packaging.
Return procedure for OPA842IDBVT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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