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Texas Instruments OPA860IDR
- Part No.:
- OPA860IDR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA860IDR.pdf
- Description:
- IC OPAMP TRANSCOND 1 CIRC 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,517
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Product details
Overview
OPA860IDR from Texas Instruments is a monolithic operational transconductance amplifier (OTA) with integrated closed-loop unity-gain buffer, designed for wide-bandwidth signal conditioning in high-speed video, RF/IF, and precision timing systems. It delivers 80MHz open-loop OTA bandwidth (G = +5), 900V/µs slew rate, 95mA/V transconductance, ±5V supply operation, and 11.2mA quiescent current - enabling ns-pulse integration and AGC loop implementation in compact PCB layouts.
For engineers reviewing the OPA860IDR datasheet, OPA860IDR pinout, OPA860IDR application, or OPA860IDR equivalent, this page provides verified functional identity, SO-8 package mapping, validated pin roles, confirmed DC/AC specifications across temperature, and two rigorously cross-checked alternative parts for high-frequency transconductance amplifier selection.
Technical Context
The OPA860IDR integrates two independent analog blocks: a three-terminal bipolar OTA (B/E/C terminals) functioning as a voltage-controlled current source with externally adjustable quiescent current (via RADJ on Pin 1), and a separate high-speed buffer with 1600MHz bandwidth and 4000V/µs slew rate. The OTA's transconductance remains stable over temperature due to its self-bias architecture and IQ tracking behavior.
Unlike conventional op amps, the OTA section operates without external feedback for current-mode gain control; its B-input impedance is 455kΩ||2.1pF, E-input resistance ranges 6.3–13.3Ω, and C-output compliance is ±4.7V at ±1mA. The buffer's input impedance is 1.0MΩ||2.1pF and output drives ±60mA into 500Ω with ±4.0V swing - decoupled from OTA biasing for stable mixed-signal performance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| OTA Bandwidth (G = +5) | 80MHz min @ VO = 200mVPP - supports >100Mbps pulse shaping and IF signal processing |
| Buffer Bandwidth | 1600MHz typ @ VO = 1VPP - enables direct drive of 50Ω transmission lines up to 1.6GHz |
| Slew Rate (OTA / Buffer) | 900V/µs min / 4000V/µs min - ensures sub-nanosecond edge fidelity for fast control loops |
| Transconductance (gm) | 95mA/V min - sets precise current gain in integrators, multipliers, and active filters |
| Quiescent Current | 11.2mA typ @ RADJ = 250Ω - balances power vs. bandwidth trade-off in portable RF front-ends |
| Supply Voltage Range | ±2.5V to ±6.5V - compatible with legacy ±5V systems and low-voltage battery-powered designs |
| Input Voltage Noise | 2.4nV/√Hz max @ f > 100kHz - critical for low-noise preamplification in sensor interfaces |
Pinout & Package
OPA860IDR is housed in an SO-8 surface-mount package (D package), with thermal resistance θJA = 125°C/W. Pin functions are electrically isolated between OTA and buffer sections.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (IQ Adjust) | OTA quiescent current control | Connects to –VS via external resistor (250Ω typical) to set gm, bandwidth, and IQ; no effect on buffer |
| Pin 2 (E) | OTA emitter input/output | Low-impedance node (6.3–13.3Ω); used for degeneration, current sensing, or common-base configuration |
| Pin 3 (B) | OTA base input | High-impedance voltage input (455kΩ||2.1pF); defines transconductance with E and C terminals |
| Pin 4 (–VS) | Negative supply rail | Common return for OTA and buffer; supports ±2.5V to ±6.5V operation |
| Pin 5 (+VS) | Positive supply rail | Power for both sections; bypass with 2.2µF solid tantalum + 0.1µF ceramic per TI layout guidelines |
| Pin 6 (Out) | Buffer output | Low-impedance voltage output (1.4Ω @ f ≤100kHz); drives 50Ω loads directly with ±4.0V swing |
| Pin 7 (In) | Buffer input | Unity-gain buffer input (1.0MΩ||2.1pF); isolated from OTA bias network for stable AC coupling |
| Pin 8 (C) | OTA collector output | High-impedance current output (54kΩ||2pF); sinks/sourses ±15mA; used in current-mode feedback loops |
Key Features
| Feature | Design Value |
|---|---|
| Versatile dual-function architecture | Independent OTA + buffer allows simultaneous current-mode signal processing and voltage-mode buffering without interaction |
| Externally adjustable transconductance | RADJ on Pin 1 tunes gm from ~75mA/V to 160mA/V, enabling dynamic bandwidth and power optimization |
| Temperature-stable gm | IQ increases with temperature, compensating for gm drift - maintains consistent gain in industrial environments |
| Baseline restore capability | OTA E-terminal supports DC restoration circuits for video clamping and level-shifting applications |
| High-speed pulse integration | Sub-ns rise time (0.7ns typ) and 6ns settling (0.05%) enable accurate integration of <10ns pulses |
Applications
| Video Line Driver | RF AGC Amplifier |
|---|---|
|
Use Scenario: Driving 75Ω coaxial cable in broadcast equipment with NTSC/PAL signals. IC Role / Device Role / Timing Role: OTA configures as forward amplifier with emitter degeneration; buffer delivers full-swing output with 0.06% differential gain error. Use Value: Maintains video fidelity up to 100MHz while rejecting supply noise (54dB PSRR) and minimizing group delay variation (<1ns over 1GHz). |
Use Scenario: Automatic gain control loop in cellular base station IF stage operating at 100–500MHz. IC Role / Device Role / Timing Role: OTA acts as voltage-controlled current source feeding integrator; buffer isolates detector output from loop dynamics. Use Value: Enables <10ns response time for fast channel switching and 95mA/V gm ensures linear dB-linear conversion over 60dB range. |
| ns-Pulse Integrator | Wideband LED Driver |
|
Use Scenario: Converting 5ns laser pulses into proportional analog voltage for time-of-flight measurement. IC Role / Device Role / Timing Role: OTA configured as current integrator with capacitor on C-terminal; buffer buffers integrated voltage without loading. Use Value: 900V/µs OTA slew rate prevents pulse distortion; 0.7ns rise time preserves timing resolution below 100ps jitter floor. |
Use Scenario: Modulating VCSEL diodes in 10Gbps fiber optic transceivers with 2.5Vpp differential drive. IC Role / Device Role / Timing Role: OTA generates precise current modulation; buffer provides matched 50Ω output impedance and 1600MHz bandwidth. Use Value: Delivers 60mA sourcing/sinking capability and <0.4ns rise time to meet IEEE 802.3ae eye diagram mask requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transconductance amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMH6723MA/NOPB | Single-channel 1.8GHz buffer only; no integrated OTA section; higher 15mA IQ; no IQ adjust pin | Lacks current-mode functionality - suitable only for pure voltage buffering, not AGC or integrator topologies | Select when only ultra-wideband voltage gain is needed and OTA functionality is unnecessary |
| OPA695IDBVR | 1.7GHz current-feedback op amp; fixed 12.5mA IQ; no transconductance tuning; 1100V/µs slew rate | Cannot emulate transistor-like OTA behavior; unsuitable for baseline restore or current-mode computation | Choose for high-gain, low-noise voltage amplification where gm programmability is not required |
Compared with LMH6723MA/NOPB and OPA695IDBVR, the OPA860IDR uniquely combines programmable transconductance with GHz-class buffering - enabling circuit topologies (e.g., OTA-based multipliers, current-mode integrators, and adaptive filters) that neither alternative supports.
Availability
OPA860IDR is available at Aetrix Electronics and suitable for video/broadcast equipment, high-speed data acquisition systems, and wideband LED driver designs requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for OPA860IDR 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-speed amplifier design and manufacturing.
The OPA860IDR belongs to TI's OPA high-speed amplifier product line, engineered specifically for wideband transconductance applications including RF signal chains, precision video systems, and fast control loop implementations.
FAQ
What is the primary function of the OPA860IDR?
The OPA860IDR integrates an operational transconductance amplifier (OTA) and a high-speed unity-gain buffer in one SO-8 package. Its core function is to provide voltage-controlled current generation (via B/E/C terminals) alongside GHz-bandwidth voltage buffering - enabling mixed-signal architectures like AGC loops, ns-pulse integrators, and video line drivers. The OPA860IDR is not a standard op amp but a specialized dual-function IC optimized for current-mode signal processing.
How does the IQ Adjust pin (Pin 1) affect OPA860IDR performance?
The IQ Adjust pin (Pin 1) connects to –VS via an external resistor (typically 250Ω) to set the OTA's quiescent current, which directly controls transconductance (gm), bandwidth, and slew rate. For example, 250Ω yields ~11.2mA total IQ and 95mA/V gm; reducing RADJ to 50Ω raises IQ to ~12.5mA and gm to ~117mA/V. This adjustment has no effect on the buffer section, whose biasing is fully independent.
Can the OPA860IDR replace the OPA660 in existing designs?
Yes - the OPA860IDR is explicitly positioned as an OPA660 upgrade in TI's documentation, offering higher bandwidth (80MHz vs. 45MHz OTA), faster slew rate (900V/µs vs. 500V/µs), and added buffer functionality (1600MHz). Pin compatibility is maintained in SO-8 packaging, but designers must verify RADJ resistor value and layout for optimal IQ setting, as OPA860IDR's gm tuning range differs.
What load conditions maximize OPA860IDR buffer bandwidth?
The OPA860IDR buffer achieves its rated 1600MHz bandwidth only under specific conditions: VO = 1VPP into RL = 500Ω. Bandwidth drops to 1200MHz at 200mVPP and 1000MHz at 5VPP. For 50Ω systems, TI recommends using a series 49.9Ω resistor at the output (per Figure 46) to maintain stability and achieve >1GHz flat response - direct 50Ω termination degrades bandwidth and may cause oscillation.
Does the OPA860IDR support single-supply operation?
No - the OPA860IDR requires dual supplies (±2.5V to ±6.5V) as specified in its absolute maximum ratings and electrical characteristics tables. Its B-input common-mode range is ±VS, E-output compliance is ±4.2V, and C-output compliance is ±4.7V - all referenced to ground. Single-supply use would violate input/output voltage limits and disable proper OTA transistor-mode operation.
OPA860IDR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- Transconductance
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 3500V/µs
- Gain Bandwidth Product:
- 470 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 1 µA
- Voltage - Input Offset:
- 3 mV
- Current - Supply:
- 11.2mA
- Current - Output / Channel:
- 15 mA
- Voltage - Supply Span (Min):
- 4.5 V
- Voltage - Supply Span (Max):
- 12 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
OPA860IDR FAQ
1.How can I place an order for OPA860IDR through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA860IDR 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 OPA860IDR reliable?
The price and inventory of OPA860IDR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA860IDR is usually 5 days.
3.What payment methods are accepted for OPA860IDR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA860IDR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA860IDR?
OPA860IDR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA860IDR 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 OPA860IDR?
For technical support, including OPA860IDR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA860IDR requirements.
6.How does Aetrix verify that OPA860IDR is sourced from the original manufacturer or authorized distributors?
All OPA860IDR 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 OPA860IDR meets industry standards.
7.What is the process for return or replacement of OPA860IDR?
All OPA860IDR units undergo pre-shipment inspection (PSI). If there is an issue with OPA860IDR, 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 OPA860IDR part is unused and in its original packaging.
Return procedure for OPA860IDR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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