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Texas Instruments OPA861IDBVT
- Part No.:
- OPA861IDBVT
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SOT-23-6
- Datasheet:
-
OPA861IDBVT.pdf
- Description:
- IC OPAMP TRANSCOND 1CIRC SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:405
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Product details
Overview
OPA861IDBVT from Texas Instruments is a wideband bipolar operational transconductance amplifier (OTA) with 80MHz open-loop bandwidth (G = +5), 900V/µs slew rate, 95mA/V transconductance, ±5V supply operation, and SOT-23-6 packaging. It serves as a voltage-controlled current source in high-speed analog signal paths for video, communications, and active filter design.
For engineers reviewing the OPA861IDBVT datasheet, OPA861IDBVT pinout, OPA861IDBVT application, or OPA861IDBVT equivalent, this page delivers verified electrical specifications, terminal-level functional mapping, real-world use cases in wideband LED drivers and control loop amplifiers, and validated alternative parts for design flexibility under ±5V or single +5V bias conditions.
Technical Context
The OPA861IDBVT implements a three-terminal OTA architecture-Base (B), Emitter (E), and Collector (C)-functioning as a self-biased, linear voltage-controlled current source. Its transconductance (gm) is externally adjustable via an IQ-adjust resistor (250Ω typical), enabling trade-offs between bandwidth (74–80MHz), quiescent current (3.4–7.4mA), and harmonic distortion (–53dB to –68dB).
Unlike discrete transistors, it maintains gm stability over temperature and supports common-E, common-B, and common-C configurations without external bias networks. The C-output delivers ±9mA sourcing/sinking capability with ±4.7V compliance, while the B-input exhibits 455kΩ||2.1pF impedance and ±3mV offset at 25°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Bandwidth (G = +5) | 80MHz at ±5V supply - enables 20MHz small-signal pulse response with <4.4ns rise/fall time |
| Slew Rate | 900V/µs - supports fast large-signal transitions (e.g., 5V step) without slewing distortion |
| Transconductance (gm) | 95mA/V min - defines gain-setting precision in current-mode circuits like integrators and AGC loops |
| Quiescent Current | 5.4mA typ (RADJ = 250Ω) - sets power-performance balance; adjustable from 1.9mA to 6.5mA |
| Input Voltage Noise | 2.4nV/√Hz @ f >100kHz - critical for low-noise wideband amplification in video and RF IF stages |
| Harmonic Distortion | –68dB 2nd-harmonic @ 5MHz - ensures fidelity in broadcast equipment and high-speed data acquisition |
| Supply Range | ±2V to ±6.3V - supports dual-rail operation in industrial and test equipment with margin for transients |
Pinout & Package
SOT-23-6 package: 2.9mm × 1.6mm × 1.15mm body, gull-wing leads, JEDEC MO-178AC compliant. Thermal resistance θJA = 150°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - IQ Adjust | Quiescent current control input | Connects to –VS via external resistor (250Ω typical) to set total IQ; pin bias current ≤6.6μA |
| 2 - –VS | Negative supply rail | Accepts –2V to –6.3V; absolute max –6.5V; requires local 0.1μF bypass capacitor |
| 3 - B (Base) | High-impedance voltage input | 455kΩ||2.1pF input; ±3mV offset; ±1μA bias current; accepts ±4.2V common-mode range |
| 4 - +VS | Positive supply rail | Accepts +2V to +6.3V; absolute max +6.5V; requires local 0.1μF bypass capacitor |
| 5 - C (Collector) | High-impedance current output | Delivers ±9mA; ±4.7V compliance; 54kΩ||2pF output impedance; current flows out for VBE > 0 |
| 6 - E (Emitter) | Low-impedance input/output node | 10.5Ω typical input resistance; ±9mA sourcing/sinking; ±4.2V compliance; used for degeneration or feedback |
Key Features
| Feature | Design Value |
|---|---|
| Externally adjustable transconductance | gm tuned from 51mA/V to 117mA/V via IQ-adjust resistor - enables dynamic bandwidth and power optimization |
| Self-biased OTA architecture | No external DC bias required - simplifies layout and eliminates thermal drift in common-emitter equivalents |
| Temperature-stable gm | gm remains constant over –40°C to +85°C - ensures consistent gain and linearity in industrial environments |
| Low input offset voltage | ±3mV max at 25°C - minimizes DC error in precision integrators and control-loop amplifiers |
| High slew rate with low distortion | 900V/µs slew + –68dB 2nd-harmonic - supports clean 20MHz video signal amplification without clipping |
Applications
| Video Line Driver | Wideband LED Driver |
|---|---|
|
Use Scenario: Driving 75Ω coaxial cable in broadcast-grade SD/HD video distribution systems with minimal group delay. IC Role / Device Role / Timing Role: Common-E configured OTA acting as non-inverting voltage amplifier with G = +5, using RE = 78Ω and RC = 500Ω. Use Value: 80MHz bandwidth and 900V/µs slew rate preserve edge integrity of 1080p60 signals; ±3mV offset prevents pedestal shift. |
Use Scenario: Modulating high-brightness LEDs in fiber-optic transmitter front-ends requiring precise current control up to 20MHz. IC Role / Device Role / Timing Role: OTA configured as voltage-controlled current source, with B-input driven by DAC and C-output sinking LED current. Use Value: 95mA/V transconductance enables sub-1% current accuracy; ±9mA output drives LEDs directly without external transistor. |
| Active Low-Pass NIC Filter | Fast Control Loop Amplifier |
|
Use Scenario: Implementing 20kHz or 10MHz low-pass filters using negative impedance converter topology for sensor signal conditioning. IC Role / Device Role / Timing Role: OTA embedded in NIC configuration with C-output feeding back through R/C network to E-input, B-input as signal entry. Use Value: Adjustable gm allows Q-factor tuning; 80MHz GBW supports sharp roll-off beyond cutoff without phase lag degradation. |
Use Scenario: Closed-loop compensation in switched-mode power supplies or laser diode controllers demanding sub-100ns response. IC Role / Device Role / Timing Role: OTA in common-C (buffer) configuration with RE ≥500Ω, providing unity-gain stable drive to error amplifier inputs. Use Value: 4.4ns rise time and ±4.7V C-output compliance enable rapid correction of load transients; low 2.4nV/√Hz noise improves SNR. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar operational transconductance amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMH6552MA/NOPB | Current-feedback amplifier (CFA); 1.8GHz GBW; fixed 1.2kΩ input impedance; no IQ adjust pin | Optimized for fixed-gain, ultra-wideband voltage amplification (e.g., ADC drivers); not suited for current-mode computation | Select when needing >1GHz bandwidth with voltage-mode gain; avoid for OTA-specific functions like integrators or AGC |
| THS3201DGN | Current-feedback op amp; 1.8GHz GBW; ±12V supply capable; higher 12.5mA quiescent current | Better suited for high-voltage, high-output-current line driving; lacks gm programmability and B/E/C terminal flexibility | Choose for ±12V systems requiring >100mA output drive; not a functional substitute for OTA-based analog computation |
Compared with OPA861IDBVT, LMH6552MA/NOPB offers higher bandwidth but no transconductance control or three-terminal OTA functionality, while THS3201DGN provides greater output current and supply range but sacrifices gm tunability and current-mode circuit versatility.
Availability
OPA861IDBVT is available at Aetrix Electronics and suitable for video/broadcast equipment, wideband LED drivers, and high-speed data acquisition systems requiring stable component supply across industrial temperature ranges (–45°C to +85°C).
Supply support for OPA861IDBVT 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 signal chain components.
The OPA861IDBVT belongs to TI's precision high-speed amplifier portfolio, designed specifically for wideband OTA applications including active filtering, video signal conditioning, and current-mode analog computation where gm control and terminal-level flexibility are essential.
FAQ
What is the primary function of the OPA861IDBVT in circuit design?
The OPA861IDBVT functions as a voltage-controlled current source (operational transconductance amplifier) with three dedicated terminals-Base (voltage input), Emitter (low-Z I/O), and Collector (high-Z current output). Its core role is enabling current-mode analog computation (e.g., integrators, summers) and wideband amplification without external biasing. Unlike op amps, the OPA861IDBVT's transconductance is externally adjustable, making it uniquely suited for adaptive bandwidth and power optimization in video, communications, and control-loop designs.
How does the IQ Adjust pin (Pin 1) affect OPA861IDBVT performance?
The IQ Adjust pin on the OPA861IDBVT sets total quiescent current by connecting an external resistor (250Ω typical) between Pin 1 and –VS. This directly controls transconductance (gm), bandwidth (74–80MHz), slew rate (840–900V/µs), and harmonic distortion (–53 to –68dB). At 5.4mA IQ, gm = 95mA/V; reducing IQ to 3.4mA lowers gm to 75mA/V and bandwidth to 74MHz, trading speed for lower power. The pin draws ≤6.6μA, enabling precise, temperature-stable gm tuning without active circuitry.
Can the OPA861IDBVT operate from a single +5V supply?
Yes, the OPA861IDBVT supports single +5V operation with specified performance: 73MHz bandwidth (G = +5), 410V/µs slew rate, and 85mA/V minimum transconductance. Input common-mode range extends from 0.8V to 4.2V, and C-output compliance reaches 0.3V to 4.7V, enabling rail-to-rail signal handling. Quiescent current drops to 4.7mA typ (RADJ = 250Ω), and harmonic distortion remains –67dB at 5MHz. Designers must reference E to mid-supply or ground and ensure proper decoupling per Figure 30 in the datasheet.
What are the key layout considerations for stable OPA861IDBVT operation?
Stable OPA861IDBVT operation requires strict adherence to high-frequency layout practices: place 0.1μF ceramic bypass capacitors within 2mm of Pins 2 (–VS) and 4 (+VS); use 25–200Ω series resistors on the B-input (Pin 3) to damp trace parasitics; keep E-input (Pin 6) and C-output (Pin 5) traces short and direct; avoid ground-plane splits under the device; and route high-speed signals away from the IQ Adjust pin (Pin 1). The SOT-23-6 package's 150°C/W θJA demands adequate copper area for thermal relief in continuous 5.4mA operation.
How does the OPA861IDBVT differ from a standard op amp in practical applications?
The OPA861IDBVT differs fundamentally from standard op amps by offering three independent, functionally distinct terminals (B, E, C) instead of differential input + single output. This enables true current-mode circuit topologies-such as current integrators, weighted summers, and NIC filters-that are impossible with voltage-mode op amps. Its transconductance is programmable, its gm stays stable over temperature, and it requires no DC bias network. In contrast, op amps rely on feedback around a fixed-gain core and cannot natively source/sink controlled current from a high-impedance output node like the OPA861IDBVT's C-terminal.
OPA861IDBVT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- Transconductance
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 900V/µs
- Gain Bandwidth Product:
- 80 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 1 µA
- Voltage - Input Offset:
- 3 mV
- Current - Supply:
- 5.4mA
- Current - Output / Channel:
- 15 mA
- Voltage - Supply Span (Min):
- 4 V
- Voltage - Supply Span (Max):
- 12.6 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-6
OPA861IDBVT FAQ
1.How can I place an order for OPA861IDBVT through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA861IDBVT 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 OPA861IDBVT reliable?
The price and inventory of OPA861IDBVT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA861IDBVT is usually 5 days.
3.What payment methods are accepted for OPA861IDBVT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA861IDBVT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA861IDBVT?
OPA861IDBVT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA861IDBVT 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 OPA861IDBVT?
For technical support, including OPA861IDBVT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA861IDBVT requirements.
6.How does Aetrix verify that OPA861IDBVT is sourced from the original manufacturer or authorized distributors?
All OPA861IDBVT 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 OPA861IDBVT meets industry standards.
7.What is the process for return or replacement of OPA861IDBVT?
All OPA861IDBVT units undergo pre-shipment inspection (PSI). If there is an issue with OPA861IDBVT, 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 OPA861IDBVT part is unused and in its original packaging.
Return procedure for OPA861IDBVT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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