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Texas Instruments OPA855IDSGT
- Part No.:
- OPA855IDSGT
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
OPA855IDSGT.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8WSON
- Quantity:
- Payment:
- Shipping:
Inventory:1,770
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Product details
Overview
OPA855IDSGT from Texas Instruments is a decompensated, bipolar-input voltage-feedback operational amplifier optimized for high-speed transimpedance and voltage amplification in optical time-of-flight (ToF) systems. It delivers 8GHz gain-bandwidth product, 0.98nV/√Hz input voltage noise, 2750V/µs slew rate, and stable operation at ≥7V/V gain - enabling high closed-loop bandwidths in LIDAR receiver front-ends with photodiode capacitances up to 20pF.
For engineers reviewing the OPA855IDSGT datasheet, OPA855IDSGT pinout, OPA855IDSGT application, or OPA855IDSGT equivalent, key selection criteria include its 8GHz GBWP, low 0.6pF common-mode input capacitance, 3.3V–5.25V supply range, power-down functionality, and WSON-8 package with exposed thermal pad for thermal management in pulsed optical sensing designs.
Technical Context
The OPA855IDSGT employs a voltage-feedback architecture with bipolar input stage, delivering ultra-wide small-signal bandwidth (2.5GHz at 100mVPP) and 850MHz large-signal bandwidth (2VPP). Its feedback pin (FB) enables direct, low-parasitic connection between output and inverting input - critical for stable TIA configurations with high photodiode capacitance.
It operates across –40°C to +125°C with 17.8mA quiescent current and supports both single-supply (3.3V–5.25V) and split-supply (±2.5V) configurations. The power-down pin (PD) provides 15ns turn-on and 120ns turn-off timing, enabling precise pulse-gated amplification in ToF receivers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-bandwidth product | 8GHz - enables >1GHz closed-loop bandwidth in TIAs with RF = 453Ω and photodiode capacitance ≤10pF |
| Input voltage noise | 0.98nV/√Hz at 1MHz - preserves SNR in weak-signal optical detection with SiPM or PMT sensors |
| Slew rate | 2750V/µs - supports clean amplification of fast laser pulses without distortion in OTDR and LIDAR |
| Input capacitance | 0.6pF common-mode / 0.2pF differential - minimizes phase shift and peaking in high-Z photodiode interfaces |
| Supply voltage range | 3.3V to 5.25V - compatible with industrial and automotive LIDAR power rails and ADC reference levels |
| Quiescent current | 17.8mA typical - balances power efficiency and RF performance in battery-constrained drone vision systems |
| Operating temperature | –40°C to +125°C - qualified for under-hood automotive LIDAR and factory-floor industrial robot applications |
Pinout & Package
OPA855IDSGT is packaged in an 8-pin WSON (DSG) with 2mm × 2mm footprint and exposed thermal pad. The thermal pad must be connected to VS– for optimal thermal performance and stability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FB (Pin 1) | Feedback input | Direct connection point for feedback resistor to minimize parasitic inductance in TIA layouts |
| IN– (Pin 3) | Inverting input | Primary photodiode or signal input node in transimpedance configuration |
| IN+ (Pin 4) | Noninverting input | DC bias reference point; used for common-mode level setting in single-supply operation |
| NC (Pin 2) | No-connect | Must remain unconnected; no internal function or routing |
| OUT (Pin 6) | Amplifier output | Low-impedance voltage output driving ADC inputs or differential drivers like THS4541 |
| PD (Pin 8) | Power-down control | Active-high logic input; enables nanosecond-scale gating for synchronized ToF pulse acquisition |
| VS– (Pin 5) | Negative supply | Ground reference in single-supply mode; connects to thermal pad for thermal conduction |
| VS+ (Pin 7) | Positive supply | 3.3V or 5V rail; decoupling capacitor required within 2mm of pin for RF stability |
Key Features
| Feature | Design Value |
|---|---|
| Decompensated stability | Guaranteed stable at gain ≥7V/V - eliminates need for external compensation in high-gain ToF receivers |
| Integrated feedback pin | Reduces layout-induced phase lag by eliminating trace inductance between output and inverting input |
| Wide input common-mode range | Operates 0.4V below VS+ and 1.1V above VS– - supports rail-to-rail input biasing in 3.3V systems |
| Fast power-down control | 15ns turn-on / 120ns turn-off - enables precise blanking during laser pulse transmission to avoid saturation |
| Low differential input capacitance | 0.2pF - minimizes noise gain peaking with high-capacitance photodiodes (e.g., >15pF SiPM arrays) |
Applications
| Optical Time Domain Reflectometry (OTDR) | 3D Laser Scanning |
|---|---|
Use Scenario: Detecting backscattered light from fiber-optic faults using nanosecond laser pulses and high-bandwidth analog capture. IC Role / Device Role / Timing Role: Transimpedance amplifier converting photodiode current to voltage with minimal group delay and overshoot. Use Value: 8GHz GBWP and 2750V/µs slew rate enable sub-nanosecond pulse fidelity and <1m spatial resolution in fiber fault location. | Use Scenario: Real-time surface mapping in robotic arms using pulsed laser triangulation with high frame-rate CMOS sensors. IC Role / Device Role / Timing Role: High-speed voltage amplifier conditioning reflected pulse amplitude before ADC sampling. Use Value: 0.98nV/√Hz noise floor and 850MHz large-signal bandwidth preserve depth accuracy in low-light indoor environments. |
| Solid-State Scanning LIDAR | Silicon Photomultiplier (SiPM) Buffer |
Use Scenario: Compact automotive or drone-mounted LIDAR using MEMS mirror scanning and pulsed VCSEL illumination. IC Role / Device Role / Timing Role: Front-end amplifier in time-of-flight receiver chain, driving TDC7201 or high-speed ADC. Use Value: Power-down pin synchronizes amplification window with laser pulse, reducing integrated noise and improving SNR by >12dB. | Use Scenario: Amplifying low-current, fast-rise-time signals from multi-pixel SiPM arrays in medical PET scanners or radiation detectors. IC Role / Device Role / Timing Role: Low-noise, low-capacitance buffer stage preserving photon timing resolution and amplitude linearity. Use Value: 0.2pF differential input capacitance minimizes signal degradation from SiPM inter-pixel capacitance, maintaining <100ps timing jitter. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA856IDSGT | Unity-gain stable (G ≥ 1V/V), lower 1.1GHz GBWP, 0.9nV/√Hz noise, higher 1.1pF input capacitance | Preferred for variable-gain or DC-coupled sensor interfaces where gain < 7V/V is required | Select OPA856IDSGT only when unity-gain stability is mandatory and bandwidth requirements are ≤300MHz |
| LMH6629MF/NOPB | Bipolar input, 10V/V minimum stable gain, 0.69nV/√Hz noise, 5.7pF input capacitance, 4GHz GBWP | Better noise performance but higher input capacitance limits use with >5pF photodiodes | Choose LMH6629MF/NOPB when ultra-low noise dominates over photodiode capacitance sensitivity |
Compared with OPA855IDSGT, the OPA856IDSGT trades bandwidth and input capacitance for unity-gain stability, while the LMH6629MF/NOPB offers lower noise but significantly higher input capacitance - making OPA855IDSGT uniquely suited for high-bandwidth, low-capacitance optical front-ends requiring ≥7V/V gain.
Availability
OPA855IDSGT is available at Aetrix Electronics and suitable for optical time-of-flight (ToF) receivers, solid-state LIDAR modules, and photomultiplier tube post-amplifiers requiring stable component supply, full traceability, and long-term industrial lifecycle support.
Supply support for OPA855IDSGT 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.
The OPA855IDSGT belongs to TI's ultra-wideband precision amplifier portfolio, designed specifically for optical sensing, LIDAR, and high-speed data acquisition where low noise, high speed, and photodiode interface integrity are critical.
FAQ
What is the minimum stable gain for OPA855IDSGT?
The OPA855IDSGT is decompensated and specified for stable operation at gains of 7V/V and higher. It is not unity-gain stable. Attempting to use it at gains below 7V/V may result in oscillation or excessive peaking. This design enables higher bandwidth and lower noise than unity-gain-stable alternatives - ideal for fixed-gain ToF receiver stages where gain is set by feedback network.
Does OPA855IDSGT support single-supply operation?
Yes, OPA855IDSGT supports true single-supply operation from 3.3V to 5.25V. Its input common-mode range extends to within 0.4V of VS+ and 1.1V above VS–, allowing mid-supply biasing of IN+ for rail-to-rail signal handling. Output swing delivers ±1.5V into 200Ω with 5V supply, making it compatible with 12-bit and 14-bit ADC drivers in compact LIDAR modules.
How does the FB pin on OPA855IDSGT improve TIA performance?
The FB pin on OPA855IDSGT provides a dedicated, low-inductance path from the amplifier output directly to the inverting input - eliminating PCB trace inductance that causes instability in high-frequency TIAs. When used with a surface-mount feedback resistor placed adjacent to FB and IN–, this feature reduces phase lag and enables stable operation with photodiode capacitances up to 20pF at 7V/V gain - verified in TI's SBOS622D characterization.
What is the thermal pad connection requirement for OPA855IDSGT?
The exposed thermal pad on the OPA855IDSGT WSON package must be soldered to a VS– (ground) copper plane. TI specifies RθJB = 45°C/W with proper board-level thermal design. Failure to connect the thermal pad results in junction temperature rise exceeding safe limits under 17.8mA quiescent current - especially critical in sealed LIDAR enclosures operating at 125°C ambient.
Can OPA855IDSGT drive a differential ADC input directly?
No, OPA855IDSGT is a single-ended output amplifier and cannot directly drive a fully differential ADC input. However, it is commonly paired with a high-speed differential driver such as the THS4541 or LMH5401 - as referenced in TI's OPA855 application diagrams - to provide balanced, low-jitter signals to ADCs like the ADS4149 in high-resolution LIDAR digitization chains.
OPA855IDSGT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 2750V/µs
- Gain Bandwidth Product:
- 8 GHz
- -3db Bandwidth:
- 2.5 GHz
- Current - Input Bias:
- 12 µA
- Voltage - Input Offset:
- 200 µV
- Current - Supply:
- 17.8mA
- Current - Output / Channel:
- 105 mA
- Voltage - Supply Span (Min):
- 3.3 V
- Voltage - Supply Span (Max):
- 5.25 V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-WSON (2x2)
OPA855IDSGT FAQ
1.How can I place an order for OPA855IDSGT through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA855IDSGT 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 OPA855IDSGT reliable?
The price and inventory of OPA855IDSGT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA855IDSGT is usually 5 days.
3.What payment methods are accepted for OPA855IDSGT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA855IDSGT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA855IDSGT?
OPA855IDSGT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA855IDSGT 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 OPA855IDSGT?
For technical support, including OPA855IDSGT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA855IDSGT requirements.
6.How does Aetrix verify that OPA855IDSGT is sourced from the original manufacturer or authorized distributors?
All OPA855IDSGT 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 OPA855IDSGT meets industry standards.
7.What is the process for return or replacement of OPA855IDSGT?
All OPA855IDSGT units undergo pre-shipment inspection (PSI). If there is an issue with OPA855IDSGT, 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 OPA855IDSGT part is unused and in its original packaging.
Return procedure for OPA855IDSGT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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