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Texas Instruments OPA861IDBVRG4
- Part No.:
- OPA861IDBVRG4
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SOT-23-6
- Datasheet:
-
OPA861IDBVRG4.pdf
- Description:
- IC OPAMP TRANSCOND 1CIRC SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:3,022
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Product details
Overview
OPA861IDBVRG4 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 external quiescent current control via pin 1. It serves as a voltage-controlled current source in high-speed video, RF, and active filter circuits.
For engineers reviewing the OPA861IDBVRG4 datasheet, OPA861IDBVRG4 pinout, OPA861IDBVRG4 application, or OPA861IDBVRG4 equivalent, this page delivers verified electrical specifications, SOT23-6 package details, functional pin roles, real-world use cases in wideband LED drivers and control loop amplifiers, and two validated alternative OTAs for design flexibility.
Technical Context
The OPA861IDBVRG4 implements a three-terminal OTA architecture analogous to a macro transistor-B (base) as high-impedance voltage input, E (emitter) as low-impedance bidirectional current node, and C (collector) as high-impedance current output-with bipolar current flow direction determined by B–E voltage polarity. Its transconductance is externally adjustable via RADJ (pin 1 to –VS), enabling trade-offs between bandwidth, quiescent current (5.4mA typ), and gain linearity.
Unlike discrete transistors, the OPA861IDBVRG4 is self-biased, exhibits constant gm over temperature when IQ is stabilized, supports degeneration for DC operating point control, and maintains near-zero output offset voltage in common-E configurations-enabling ground-referenced, bias-free signal paths in forward amplifiers and active filters.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Bandwidth | 80MHz at G = +5, VO = 200mVPP, RL = 500Ω - enables full-spectrum video and 20MHz RF signal amplification without roll-off. |
| Slew Rate | 900V/µs - supports clean 5V-step response in <4.4ns, critical for pulse integrity in data acquisition systems. |
| Transconductance (gm) | 95mA/V min at VO = ±10mV - defines linear small-signal current gain; adjustable from 75–160mA/V via IQ control resistor. |
| Quiescent Current | 5.4mA typ with RADJ = 250Ω - sets baseline power consumption and thermal profile for SOT23-6 package. |
| Input Voltage Noise | 2.4nV/√Hz above 100kHz - ensures low-noise performance in high-gain, wideband analog front-ends. |
| Supply Voltage Range | ±2.0V to ±6.3V - allows operation from low-power ±2.5V rails up to robust ±5V industrial supplies. |
| Operating Temp Range | –45°C to +85°C - qualified for industrial and broadcast equipment environments. |
Pinout & Package
SOT23-6 surface-mount package (DBV designation), 2.9mm × 1.6mm footprint, 0.95mm height, thermal resistance θJA = 150°C/W - optimized for space-constrained, high-density PCB layouts with moderate power dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (IQ Adjust) | Quiescent current control input | Connects to –VS via external resistor (50Ω–1kΩ) to set total IQ from 1mA to 6mA; determines gm, bandwidth, and noise. |
| 2 (–VS) | Negative supply rail | Accepts –2.0V to –6.3V; internal biasing reference for OTA core and E/C terminals. |
| 3 (B) | Base (high-Z voltage input) | High-impedance (455kΩ || 2.1pF) differential input node; voltage-controlled gate of transconductance stage. |
| 4 (+VS) | Positive supply rail | Accepts +2.0V to +6.3V; complements –VS for dual-supply operation or single +5V bias. |
| 5 (C) | Collector (current output) | High-impedance current sink/source output (54kΩ || 2pF); current flows out for VB > VE, in for VB < VE. |
| 6 (E) | Emitter (low-Z bidirectional node) | Low-impedance (6.3–13.3Ω) current-summing node; used for degeneration, feedback, or load connection. |
Key Features
| Feature | Design Value |
|---|---|
| External IQ control | Adjustable quiescent current (1–6mA) via single resistor on pin 1 enables dynamic optimization of bandwidth, power, and distortion. |
| Self-biased OTA core | No external bias network required - simplifies layout, reduces component count, and eliminates bias drift in temperature-varying environments. |
| Constant transconductance vs temp | gm remains stable across –45°C to +85°C when IQ is fixed, improving gain accuracy in precision control loops. |
| Ground-referenced operation | Common-E amplifier topology supports fully ground-referenced inputs and outputs with zero VOS - eliminates DC blocking capacitors. |
| Three-terminal macro-transistor model | B/E/C terminal labeling and behavior enable intuitive transistor-like circuit design (common-E/B/C) while delivering superior linearity and gm stability. |
Applications
| Video Line Driver | Wideband LED Driver |
|---|---|
Use Scenario: Driving 75Ω coaxial cable in broadcast video equipment with minimal group delay and flat frequency response to 10MHz. IC Role / Device Role / Timing Role: Forward amplifier (common-E configuration) providing noninverting G = +5 gain, 80MHz bandwidth, and 900V/µs slew rate to preserve edge fidelity. Use Value: Eliminates need for AC-coupling and DC restoration stages due to zero-output-offset operation and rail-to-rail compliance (±4.2V). | Use Scenario: Modulating high-brightness LEDs in fiber-optic transmitter modules requiring fast current switching and precise amplitude control. IC Role / Device Role / Timing Role: Voltage-controlled current source (B-input voltage → C-output current) with 95mA/V transconductance and sub-5ns rise time. Use Value: Enables direct analog modulation without external current-sense resistors or op-amp feedback loops, reducing component count and propagation latency. |
| Active Low-Pass NIC Filter | Fast Control Loop Amplifier |
Use Scenario: Implementing 20kHz or 10MHz low-pass negative impedance converter (NIC) filters for sensor interface and signal conditioning. IC Role / Device Role / Timing Role: OTA-based NIC core with E-terminal degeneration and C-terminal feedback to synthesize negative resistance for Q-enhancement. Use Value: Achieves sharp cutoff and tunable resonance without inductors or high-Q passive components - ideal for compact, integrated filter designs. | Use Scenario: Closed-loop compensation in switched-mode power supplies and motor drives demanding sub-microsecond error response. IC Role / Device Role / Timing Role: High-speed error amplifier in Type III compensator networks, leveraging 80MHz GBW and 900V/µs slew rate for rapid transient recovery. Use Value: Reduces phase lag at crossover frequency compared to conventional op-amps, improving stability margin and load-step response time. |
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) with 1.8GHz GBW, 3600V/µs slew rate; no external IQ control; fixed 12.5mA IQ. | Optimized for ultra-high-speed ADC drivers and IF amplifiers; lacks OTA's current-source output and degeneration flexibility. | Select when absolute bandwidth >500MHz and voltage-mode gain are primary; avoid when current-mode computation or IQ tuning is required. |
| THS3091D | High-speed current-feedback op-amp with 210MHz GBW, 2750V/µs slew rate, ±15V supply; no B/E/C terminal model or transconductance specification. | Targeted at high-voltage, high-current output stages (±120mA); not suitable for low-distortion OTA-style analog computation. | Choose for driving heavy capacitive loads or high-voltage swing applications; not a functional substitute for OTA-based integrators or NIC filters. |
Compared with LMH6552MA/NOPB and THS3091D, the OPA861IDBVRG4 uniquely provides externally adjustable transconductance, true three-terminal OTA behavior (B/E/C), and ground-referenced zero-VOS operation-making it irreplaceable for current-mode analog computation, active filter synthesis, and bias-free video line driving.
Availability
OPA861IDBVRG4 is available at Aetrix Electronics and suitable for video/broadcast equipment, high-speed data acquisition systems, and wideband active filter designs requiring stable component supply, consistent parametric performance, and long-term industrial availability.
Supply support for OPA861IDBVRG4 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, embedded processing, and high-performance signal chain solutions with decades of precision amplifier innovation.
The OPA861IDBVRG4 belongs to TI's high-speed operational transconductance amplifier product line, engineered specifically for wideband video, RF/IF signal processing, and current-mode analog computation where gm control, bandwidth, and low-noise performance are critical.
FAQ
What is the function of pin 1 (IQ Adjust) on the OPA861IDBVRG4?
Pin 1 is the quiescent current adjust terminal. Connecting an external resistor (50Ω–1kΩ) from pin 1 to –VS sets the total device IQ from 1mA to 6mA, directly controlling transconductance, bandwidth, slew rate, and input noise. With RADJ = 250Ω, OPA861IDBVRG4 draws 5.4mA at +25°C and achieves 80MHz bandwidth.
Can the OPA861IDBVRG4 operate from a single +5V supply?
Yes, the OPA861IDBVRG4 supports single +5V operation (with –VS grounded). Electrical characteristics show 73MHz bandwidth and 410V/µs slew rate under +5V conditions. Input common-mode range extends to ground, and E/C output compliance accommodates 0.8V to 4.2V swing - enabling true single-supply, ground-referenced designs.
How does the OPA861IDBVRG4 differ from a standard op-amp in circuit implementation?
The OPA861IDBVRG4 is a three-terminal OTA (B/E/C), not a voltage-output op-amp. Its C-terminal delivers a controlled current proportional to B–E voltage, enabling current-mode functions (integrators, summers, NICs) impossible with voltage-output devices. It requires no feedback resistor to ground at the E-node and offers inherent zero-VOS in common-E configurations - unlike op-amps needing precision resistors and offset trimming.
What is the maximum safe operating voltage for the OPA861IDBVRG4?
The absolute maximum supply voltage is ±6.5VDC per the datasheet. For reliable operation, TI specifies ±6.3V as the maximum operating voltage. Exceeding this risks permanent damage. The OPA861IDBVRG4 is characterized from ±2.0V to ±6.3V, with optimal performance at ±5V - where it delivers 80MHz bandwidth and 900V/µs slew rate.
Is the OPA861IDBVRG4 suitable for active filter design, and if so, what topologies are supported?
Yes, the OPA861IDBVRG4 is explicitly designed for wideband active filters. Its datasheet demonstrates low-pass Negative Impedance Converter (NIC) filters at 20kHz and 10MHz using B/E/C connections. Supported topologies include common-E forward amplifiers, common-B inverting stages, and current-mode integrators - all enabled by its OTA architecture, adjustable gm, and high output impedance at the C-terminal.
OPA861IDBVRG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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:
- -
- 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
OPA861IDBVRG4 FAQ
1.How can I place an order for OPA861IDBVRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA861IDBVRG4 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 OPA861IDBVRG4 reliable?
The price and inventory of OPA861IDBVRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA861IDBVRG4 is usually 5 days.
3.What payment methods are accepted for OPA861IDBVRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA861IDBVRG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA861IDBVRG4?
OPA861IDBVRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA861IDBVRG4 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 OPA861IDBVRG4?
For technical support, including OPA861IDBVRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA861IDBVRG4 requirements.
6.How does Aetrix verify that OPA861IDBVRG4 is sourced from the original manufacturer or authorized distributors?
All OPA861IDBVRG4 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 OPA861IDBVRG4 meets industry standards.
7.What is the process for return or replacement of OPA861IDBVRG4?
All OPA861IDBVRG4 units undergo pre-shipment inspection (PSI). If there is an issue with OPA861IDBVRG4, 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 OPA861IDBVRG4 part is unused and in its original packaging.
Return procedure for OPA861IDBVRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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