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Texas Instruments OPA861IDBVR
- Part No.:
- OPA861IDBVR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SOT-23-6
- Datasheet:
-
OPA861IDBVR.pdf
- Description:
- IC OPAMP TRANSCOND 1CIRC SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:3,131
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Product details
Overview
OPA861IDBVR 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 IQ-adjust capability via pin 1. It serves as a voltage-controlled current source in high-speed video, RF, and active filter signal paths.
For engineers reviewing the OPA861IDBVR datasheet, OPA861IDBVR pinout, OPA861IDBVR application, or OPA861IDBVR equivalent, this page delivers verified specifications, SOT23-6 package layout, real-world use cases in wideband LED drivers and control loop amplifiers, and two validated alternative OTAs for design flexibility.
Technical Context
The OPA861IDBVR implements a three-terminal OTA architecture-B (high-Z base input), E (low-Z emitter input/output), and C (high-Z collector current output)-functioning as a self-biased, linear voltage-controlled current source. Its transconductance is externally adjustable via RADJ (pin 1 to –VS), enabling trade-offs between bandwidth, quiescent current (5.4mA typ), and gain.
It supports common-emitter, common-base, and common-collector configurations without DC biasing networks. The C-output current polarity follows B–E voltage polarity, and transconductance remains stable over temperature when IQ is fixed, unlike discrete transistors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Bandwidth | 80MHz at G = +5, enabling 20MHz small-signal video and IF amplification without phase degradation. |
| Slew Rate | 900V/µs, supporting clean 5VPP large-signal step response in <4.4ns rise/fall time. |
| Transconductance | 95mA/V min (±10mV input), defining precise current output scaling for analog computation circuits. |
| Quiescent Current | 5.4mA typical with 250Ω RADJ, adjustable from 1mA to 6mA for power/performance optimization. |
| Input Voltage Noise | 2.4nV/√Hz >100kHz, critical for low-noise wideband amplification in broadcast equipment. |
| Supply Range | ±2.0V to ±6.3V, allowing operation from single +5V or dual ±5V rails in compact systems. |
| Output Compliance | ±4.2V on E-output and ±4.7V on C-output at ±1mA, ensuring headroom in ±5V systems. |
Pinout & Package
SOT23-6 surface-mount package (DBV), 2.9mm × 1.6mm footprint, 0.95mm height, thermal resistance θJA = 150°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (IQ Adjust) | Quiescent current control node | Connects to –VS via RADJ resistor (250Ω typical) to set total IQ; bias current flows out of this pin. |
| 2 (–VS) | Negative supply rail | Accepts –2.0V to –6.3V; internal bias generation reference for OTA core. |
| 3 (B) | Base input (high-Z voltage terminal) | High-impedance (455kΩ || 2.1pF) input controlling transconductance; ±4.2V common-mode range. |
| 4 (+VS) | Positive supply rail | Accepts +2.0V to +6.3V; powers internal circuitry and defines output compliance limits. |
| 5 (C) | Collector output (current source/sink) | High-impedance current output (54kΩ || 2pF); ±15mA sourcing/sinking capability at 0V. |
| 6 (E) | Emitter input/output (low-Z terminal) | Low-impedance node (10.5Ω typ) used for feedback, degeneration, or output; ±4.2V compliance at ±1mA. |
Key Features
| Feature | Design Value |
|---|---|
| External IQ control | Adjustable quiescent current (1–6mA) via single external resistor enables dynamic bandwidth/power tuning. |
| Self-biased OTA core | Eliminates external bias networks required by discrete transistors, reducing component count and layout complexity. |
| Constant gm over temperature | Transconductance stability maintained when IQ is fixed, improving linearity and gain predictability in industrial environments. |
| Three-terminal transistor analogy | B/E/C terminals map directly to transistor-based design intuition, accelerating adoption in AGC, integrator, and filter designs. |
| Low distortion at high frequency | –68dB 2nd-harmonic distortion at 5MHz/2VPP enables clean signal reproduction in video and communications systems. |
Applications
| Video Line Driver | Wideband LED Driver |
|---|---|
Use Scenario: Driving 75Ω coaxial cable in HD broadcast equipment with minimal group delay and overshoot. IC Role / Device Role / Timing Role: Forward amplifier (common-E configuration) providing noninverting gain G = +5, DC-coupled, with zero output offset voltage. Use Value: Eliminates DC blocking capacitors and bias networks, preserving low-frequency response and simplifying PCB layout. |
Use Scenario: Modulating high-speed VCSELs in fiber-optic transceivers requiring precise current control up to 100MHz. IC Role / Device Role / Timing Role: Voltage-controlled current source (B-input voltage → C-output current) with fast settling and low noise. Use Value: Enables direct analog modulation without DAC+driver stages, reducing latency and component count in optical modules. |
| 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 configured as NIC element with E-terminal grounded and C-terminal feeding feedback network. Use Value: Achieves sharp roll-off and tunable cutoff without inductors or high-precision passive components. |
Use Scenario: Closed-loop compensation in switched-mode power supplies or motor drives demanding sub-100ns error amplifier response. IC Role / Device Role / Timing Role: High-gain, high-slew-rate error amplifier in Type III compensator networks with wide bandwidth margin. Use Value: Supports >1MHz crossover frequencies while maintaining phase margin, improving transient response and stability. |
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), not OTA; 1.8GHz GBW, 3600V/µs slew, no IQ adjust pin. | Used where ultra-high speed and low distortion dominate over transconductance linearity and analog computation flexibility. | Select LMH6552MA/NOPB only when voltage-mode gain-bandwidth product >1GHz is required and OTA-specific functions (e.g., current integration) are unnecessary. |
| THS3201DGNR | Current-feedback op amp with 1.8GHz GBW, 4700V/µs slew, fixed bias; lacks B/E/C terminal structure and gm control. | Preferred for unity-gain stable high-speed buffers or inverting amplifiers-not suitable for OTA-style current-mode circuits. | Choose THS3201DGNR for pure voltage-amplification tasks above 500MHz; avoid when transconductance-based design (e.g., AGC, NIC filters) is needed. |
Compared with OPA861IDBVR, LMH6552MA/NOPB offers higher raw speed but no transconductance programmability or three-terminal flexibility, while THS3201DGNR excels in voltage-mode buffering but cannot replicate OTA-based analog computation topologies.
Availability
OPA861IDBVR 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 OPA861IDBVR 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 delivering analog, embedded processing, and logic solutions with emphasis on high-performance signal chain and power management ICs.
The OPA861IDBVR belongs to TI's precision high-speed amplifier portfolio, designed specifically for wideband transconductance applications including video, RF, active filtering, and analog computation where transistor-like behavior with enhanced linearity is essential.
FAQ
What is the primary function of the OPA861IDBVR?
The OPA861IDBVR is an operational transconductance amplifier (OTA) that converts a differential voltage applied between its B and E terminals into a proportional output current at the C terminal. Its core function is voltage-controlled current sourcing/sinking, enabling analog computation, active filtering, and high-speed amplification without DC biasing networks. This behavior makes the OPA861IDBVR distinct from conventional op amps and ideal for applications like NIC filters and LED drivers.
How does the IQ adjust pin (Pin 1) affect OPA861IDBVR performance?
The IQ adjust pin (Pin 1) sets total quiescent current by sinking current through an external resistor (RADJ) tied to –VS. With RADJ = 250Ω, OPA861IDBVR draws 5.4mA, yielding 80MHz bandwidth and 95mA/V transconductance. Reducing RADJ increases IQ, boosting bandwidth and slew rate but raising power; increasing RADJ lowers IQ, trading speed for efficiency. This direct IQ control allows real-time optimization of OPA861IDBVR for specific system requirements.
Can OPA861IDBVR operate from a single +5V supply?
Yes, OPA861IDBVR supports single-supply operation at +5V (with –VS grounded). Electrical characteristics specify performance at VS = +5V, including 73MHz bandwidth, 410V/µs slew rate, and ±4.2V E-output compliance. Input common-mode range extends to ground, and the B-input accepts signals from 0.8V to 4.2V. However, dual ±5V operation delivers full specified AC performance (80MHz, 900V/µs) and wider output swing.
What are the key differences between OPA861IDBVR and standard op amps?
Unlike voltage-output op amps, OPA861IDBVR provides a high-impedance current output (C terminal) with transconductance gain (gm), not voltage gain. It has three functional terminals (B, E, C) analogous to a transistor, supports current-mode circuits (integrators, summers), requires no external biasing, and offers external IQ control. Standard op amps lack these features and cannot replicate OTA-specific topologies like NIC filters or voltage-controlled current sources.
Is OPA861IDBVR suitable for driving capacitive loads such as cables or ADC inputs?
OPA861IDBVR can drive moderate capacitive loads when configured with appropriate feedback and degeneration. Its E-terminal (low-Z) is recommended for direct capacitive loading, while the C-terminal (high-Z current source) should feed resistive or buffered nodes. For 75Ω coaxial cable, use common-E forward amplifier topology with RE ≥100Ω and RL = 75Ω. Stability with >100pF loads requires careful compensation per Figure 33 in the datasheet; unbuffered direct connection to high-C ADC inputs is not advised without isolation.
OPA861IDBVR 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:
- 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
OPA861IDBVR FAQ
1.How can I place an order for OPA861IDBVR through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA861IDBVR 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 OPA861IDBVR reliable?
The price and inventory of OPA861IDBVR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA861IDBVR is usually 5 days.
3.What payment methods are accepted for OPA861IDBVR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA861IDBVR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA861IDBVR?
OPA861IDBVR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA861IDBVR 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 OPA861IDBVR?
For technical support, including OPA861IDBVR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA861IDBVR requirements.
6.How does Aetrix verify that OPA861IDBVR is sourced from the original manufacturer or authorized distributors?
All OPA861IDBVR 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 OPA861IDBVR meets industry standards.
7.What is the process for return or replacement of OPA861IDBVR?
All OPA861IDBVR units undergo pre-shipment inspection (PSI). If there is an issue with OPA861IDBVR, 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 OPA861IDBVR part is unused and in its original packaging.
Return procedure for OPA861IDBVR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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