OPA857 Texas Instruments Integrated Circuit (Quad Flat No-Lead) In Stock
OPA857 is an ultralow-noise wideband transimpedance amplifier (TIA) with selectable feedback resistance, 1.8 GHz gain-bandwidth product, and sub-2 pA/√Hz input current noise in a QFN package. Designed for high-speed photodiode receivers and optical sensing front-ends.
- Manufacturer
- Texas Instruments
- Package
- Quad Flat No-Lead
- Pin Count
- 17
- Lifecycle
- ACTIVE
- Datasheet
- OPA857 Datasheet PDF
- Category
- Integrated Circuit
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of OPA857?
- 1.8 GHz gain-bandwidth product for high-speed signal chain designs
- Selectable internal feedback resistor values for flexible transimpedance gain setting
- Input current noise below 2 pA/√Hz for ultralow-noise photodiode receiver applications
- Fixed-gain transimpedance architecture simplifies PCB layout versus discrete TIA designs
- Wide supply voltage range from ±2.5 V to ±5 V dual supply
- QFN package with exposed thermal pad for low parasitics and compact layout
What is OPA857 used for?
OPA857 is used in fiber-optic receivers, time-of-flight LiDAR systems, and fluorescence spectroscopy instruments where the TIA must convert small photodiode currents to voltage with minimal noise at hundreds of megahertz bandwidth. Its selectable feedback resistance enables a single part to serve multiple gain settings across optical power levels. High-speed barcode scanners and optical coherence tomography front-ends also rely on its ultralow noise and wideband performance.
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
Where can I find the OPA857 datasheet?
OPA857 Datasheet DownloadOfficial datasheet from Texas Instruments
What are equivalent replacements for OPA857?
Compatible alternatives and drop-in replacements for OPA857:
Frequently Asked Questions
What gain-bandwidth product does OPA857 offer and how does that limit usable bandwidth at a given transimpedance gain?
OPA857 provides a 1.8 GHz gain-bandwidth product. At the highest selectable feedback resistance, the closed-loop bandwidth is reduced proportionally, but at lower gain settings the bandwidth can reach several hundred megahertz. This makes it suitable for photodiode receivers operating at data rates from 100 Mbps up to 1 Gbps optical links.
What input current noise does OPA857 achieve and why does that matter for weak optical signal detection?
OPA857 achieves input current noise below 2 pA/√Hz, which is critical when converting the tiny photocurrents from low-light photodiodes, such as those receiving signals at nA-level in fluorescence or single-photon-counting applications. Lower current noise directly sets the minimum detectable optical power for a given bandwidth, enabling measurements down to picowatt-level signals.
How does the selectable feedback resistance feature of OPA857 simplify a LiDAR receiver design?
OPA857 integrates selectable internal feedback resistors, eliminating the need for external precision resistors and reducing parasitic capacitance that would limit bandwidth. For a LiDAR receiver operating at 10 MHz to 100 MHz pulse rates, selecting the appropriate feedback resistance on-chip allows the designer to target a specific transimpedance gain in kΩ without external components, saving board space and improving noise performance.
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About Texas Instruments
Texas Instruments (TI) is a global semiconductor company headquartered in Dallas, Texas. TI designs and manufactures analog and embedded processing chips used in industrial, automotive, consumer, communications, and enterprise systems.
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