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Texas Instruments OPA858IDSGR
- Part No.:
- OPA858IDSGR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
OPA858IDSGR.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8WSON
- Quantity:
- Payment:
- Shipping:
Inventory:5,668
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Product details
Overview
OPA858IDSGR from Texas Instruments is a decompensated, 5.5GHz gain-bandwidth product, FET-input operational amplifier optimized for transimpedance amplifier (TIA) configurations in optical time-of-flight systems. It delivers 2000V/µs slew rate, 2.5nV/√Hz input voltage noise, 10pA bias current, and stable operation at ≥7V/V gain in an 8-pin WSON package. It enables high-bandwidth photodiode signal conditioning in LIDAR receivers.
For engineers reviewing the OPA858IDSGR datasheet, OPA858IDSGR pinout, OPA858IDSGR application, or OPA858IDSGR equivalent, this page provides verified technical context, real-world TIA design parameters, thermal performance data, and validated alternatives for optical sensing front-ends requiring sub-nanosecond transient response and ultra-low input capacitance.
Technical Context
The OPA858IDSGR implements a voltage-feedback architecture with CMOS inputs and a dedicated feedback pin (FB) routed internally to the output-enabling low-inductance, on-package RF placement between FB and IN–. Its 0.2pF differential and 0.62pF common-mode input capacitance minimize phase margin degradation in high-gain TIAs.
Stable only at gains ≥7V/V, it achieves 600MHz large-signal bandwidth (2VPP) and 1.2GHz small-signal bandwidth (100mVPP). Power-down control (PD pin) enables <140µA quiescent current in standby, with 13ns turn-on and 120ns turn-off delays-critical for pulsed LIDAR timing precision.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Bandwidth Product | 5.5GHz - Enables closed-loop TIA bandwidths >100MHz with photodiode capacitances up to 20pF. |
| Min Stable Gain | 7V/V - Must be used at ≥7× noise-gain; not unity-gain stable; requires careful layout to avoid oscillation. |
| Input Voltage Noise | 2.5nV/√Hz at 1MHz - Dominates total input-referred noise in low-capacitance photodiode applications. |
| Slew Rate | 2000V/µs - Supports clean 2VPP output steps with ≤0.3ns rise/fall times for fast pulse detection. |
| Differential Input Capacitance | 0.2pF - Reduces Miller effect and stabilizes feedback loop in high-gain TIAs with parasitic photodiode capacitance. |
| Supply Voltage Range | 3.3V to 5.25V - Compatible with standard LIDAR system rails; supports single-supply 3.3V or split-supply ±2.5V operation. |
| Quiescent Current | 20.5mA typical at 5V - Sets power budget for high-speed analog front-ends; scales linearly with supply voltage. |
Pinout & Package
OPA858IDSGR is housed in an 8-pin WSON (DSG) package measuring 2.00mm × 2.00mm with exposed thermal pad. The thermal pad must be connected to VS– for optimal thermal performance (RθJB = 45°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FB (Pin 1) | Feedback input | Internally tied to output; allows direct, low-parasitic RF connection to IN–-eliminates routing inductance that destabilizes GHz-bandwidth loops. |
| IN– (Pin 3) | Inverting input | Primary TIA input node; isolated from FB by NC pin to suppress capacitive coupling and preserve phase margin. |
| IN+ (Pin 4) | Noninverting input | DC bias reference point; typically tied to VREF (midsupply or ground) to set common-mode output level. |
| NC (Pin 2) | No-connect | Physical guard ring between FB and IN–; must remain unconnected to maintain high-frequency isolation. |
| OUT (Pin 6) | Amplifier output | Low-impedance, high-slew output capable of driving 200Ω loads; supports differential output stages like THS4541. |
| PD (Pin 8) | Power-down control | Active-high logic input; drives amplifier into 140µA standby mode-essential for duty-cycled ToF systems. |
| VS+ (Pin 7) | Positive supply | Accepts 3.3V–5.25V; PSRR+ = 74–84dB ensures immunity to digital supply noise in mixed-signal LIDAR modules. |
| VS– (Pin 5) | Negative supply | Ground or negative rail; thermal pad must be soldered to VS– plane for reliable 125°C operation. |
Key Features
| Feature | Design Value |
|---|---|
| Feedback pin (FB) architecture | Enables surface-mount RF placement on same PCB side as IN–, reducing loop inductance by >30% vs conventional layouts. |
| 0.2pF differential input capacitance | Minimizes noise gain peaking in TIAs with >10pF photodiode capacitance-directly extends usable bandwidth. |
| 13ns power-on delay | Aligns amplifier enable edge within ±500ps of laser pulse trigger-preserves time-of-flight measurement accuracy. |
| Exposed thermal pad (connected to VS–) | Lowers junction-to-board thermal resistance to 45°C/W-supports continuous 20.5mA operation at 125°C ambient. |
| Ultra-low 10pA input bias current | Prevents photodiode leakage current from inducing offset drift-critical for SiPM and APD sensor interfaces. |
Applications
| Optical Time Domain Reflectometry (OTDR) | 3D Scanner |
|---|---|
Use Scenario: Detecting backscattered light pulses in fiber-optic cables to locate faults or splices over distances up to 100km. IC Role / Device Role / Timing Role: Transimpedance amplifier converting nanoampere photocurrent pulses into clean, high-fidelity voltage waveforms for time-domain analysis. Use Value: 5.5GHz GBWP and 2000V/µs slew rate resolve sub-nanosecond pulse edges-enabling <1m spatial resolution in long-haul OTDR. | Use Scenario: Real-time depth mapping in handheld or robotic 3D scanners using structured light or pulsed laser triangulation. IC Role / Device Role / Timing Role: Front-end TIA amplifying weak return signals from micro-mirror-scanned laser spots across complex surfaces. Use Value: 2.5nV/√Hz noise floor and 0.2pF input capacitance maximize SNR for low-reflectivity targets-improving depth accuracy to ±0.1mm. |
| Laser Distance Measurement | Solid-State Scanning LIDAR |
Use Scenario: Industrial handheld distance meters measuring object separation from 0.1m to 300m using time-of-flight principles. IC Role / Device Role / Timing Role: High-speed TIA conditioning photodiode output for precise stop-time capture by TDC7201 or similar time-to-digital converters. Use Value: 13ns turn-on delay and 7V/V minimum gain ensure consistent pulse amplification across measurement ranges-reducing range error to <±1mm. | Use Scenario: Automotive or robotics perception systems using MEMS or optical phased array scanning for 180° field-of-view coverage. IC Role / Device Role / Timing Role: Per-channel TIA in multi-pixel receiver arrays, each processing return pulses from distinct scan angles. Use Value: 8-pin WSON package (2mm × 2mm) enables dense pixel-level integration; PD pin allows per-channel power gating to manage system-level power. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transimpedance amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA855IDSGR | Bipolar input (0.98nV/√Hz noise), higher 8GHz GBWP, but 0.8pF input capacitance vs OPA858's 0.2pF. | Better for ultra-low-noise DC-coupled preamps; less suitable for high-CPD TIAs where OPA858's lower CDIFF improves stability. | Select OPA855 when photodiode capacitance <5pF and voltage noise dominates; choose OPA858 for CPD >10pF or when layout-induced instability is a concern. |
| LMH6629MF/NOPB | Bipolar input (0.69nV/√Hz), 4GHz GBWP, 5.7pF input capacitance, unity-gain stable. | Supports lower-gain configurations and wider supply range (±5V); lacks dedicated FB pin and PD control. | Use LMH6629 for general-purpose high-speed amplification where gain flexibility and simplicity outweigh GHz bandwidth needs; OPA858 preferred for production LIDAR TIAs demanding repeatable 100+MHz bandwidth. |
Compared with OPA855IDSGR and LMH6629MF/NOPB, the OPA858IDSGR uniquely balances ultra-low input capacitance (0.2pF), integrated power-down, and FB-pin layout-making it the only option among the three qualified for production-grade, high-density, pulsed ToF receiver designs operating above 100MHz closed-loop bandwidth.
Availability
OPA858IDSGR is available at Aetrix Electronics and suitable for optical time domain reflectometry (OTDR), solid-state scanning LIDAR, and laser distance measurement systems requiring stable component supply, traceable lot control, and guaranteed long-term availability.
Supply support for OPA858IDSGR 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 company headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and communications markets.
The OPA858IDSGR belongs to TI's high-speed precision op amp portfolio, engineered specifically for optical sensing front-ends where bandwidth, noise, and input capacitance directly determine time-of-flight resolution and detection range.
FAQ
What is the minimum stable gain for OPA858IDSGR, and why is it specified?
The OPA858IDSGR has a minimum stable gain of 7V/V. It is decompensated to achieve its 5.5GHz gain-bandwidth product, trading unity-gain stability for higher speed and lower noise. Using it below 7V/V risks oscillation due to insufficient phase margin-verified by stability testing across temperature and capacitive load conditions in the official datasheet.
Does OPA858IDSGR support single-supply operation, and what is the recommended common-mode input range?
Yes, OPA858IDSGR supports single-supply operation from 3.3V to 5.25V. Its input common-mode range extends from the negative rail (VS–) to within 1.4V of the positive rail (VS+), enabling full-rail operation when VS– = 0V. For 3.3V supplies, inputs can swing from 0V to 1.9V while maintaining CMRR >66dB-ideal for midsupply-biased photodiode TIAs.
How does the FB pin on OPA858IDSGR improve transimpedance amplifier layout?
The FB pin (Pin 1) on OPA858IDSGR is internally connected to the output, allowing the feedback resistor to be placed directly between FB and IN– on the same side of the package. This eliminates routing around the IC body, reducing parasitic inductance by ~40% and minimizing high-frequency phase shift-key to preserving stability in >100MHz TIAs with photodiode capacitances above 10pF.
What is the purpose of the NC pin (Pin 2) adjacent to FB and IN– on OPA858IDSGR?
The NC pin (Pin 2) on OPA858IDSGR serves as a physical guard ring between the FB and IN– pins. By isolating these high-impedance, high-frequency nodes, it reduces parasitic capacitive coupling that would otherwise degrade phase margin and cause peaking or oscillation-especially critical in decompensated amplifiers operating near their GBWP limit.
Can OPA858IDSGR drive a differential ADC input directly, and what interface components are recommended?
OPA858IDSGR is a single-ended output amplifier and cannot drive a differential ADC input directly. TI recommends pairing it with a high-speed differential driver such as the THS4541 or LMH5401. These devices provide the required common-mode level shifting, amplitude scaling, and balanced output drive-enabling full utilization of the OPA858IDSGR's 600MHz large-signal bandwidth in LIDAR data acquisition chains.
OPA858IDSGR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- J-FET
- Number of Circuits:
- 1
- Output Type:
- Single-Ended
- Slew Rate:
- 2000V/µs
- Gain Bandwidth Product:
- 5.5 GHz
- -3db Bandwidth:
- 1.2 GHz
- Current - Input Bias:
- 0.4 pA
- Voltage - Input Offset:
- 800 µV
- Current - Supply:
- 21mA
- 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
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-WSON (2x2)
OPA858IDSGR FAQ
1.How can I place an order for OPA858IDSGR through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA858IDSGR 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 OPA858IDSGR reliable?
The price and inventory of OPA858IDSGR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA858IDSGR is usually 5 days.
3.What payment methods are accepted for OPA858IDSGR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA858IDSGR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA858IDSGR?
OPA858IDSGR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA858IDSGR 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 OPA858IDSGR?
For technical support, including OPA858IDSGR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA858IDSGR requirements.
6.How does Aetrix verify that OPA858IDSGR is sourced from the original manufacturer or authorized distributors?
All OPA858IDSGR 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 OPA858IDSGR meets industry standards.
7.What is the process for return or replacement of OPA858IDSGR?
All OPA858IDSGR units undergo pre-shipment inspection (PSI). If there is an issue with OPA858IDSGR, 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 OPA858IDSGR part is unused and in its original packaging.
Return procedure for OPA858IDSGR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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