A high-speed operational amplifier is sold on its –3 dB bandwidth, but that single number hides three independent limits, and the wrong one will bound your design.
Gain-bandwidth product (small signal)
GBP sets the closed-loop bandwidth for small signals: bandwidth ≈ GBP / noise-gain. It is the right metric for AC-coupled, low-amplitude paths, but it says nothing about how the output moves over a large step.
Slew rate (large signal)
Slew rate limits how fast the output can travel, roughly V/µs. Feed a high-speed op-amp a large, fast edge and it ramps at its slew rate regardless of bandwidth, producing a trapezoidal, distorted waveform. Always check slew rate against your largest signal amplitude and fastest edge.
Settling time (accuracy)
For ADC driving and switched, multiplexed channels, the time to settle to a specified accuracy — not the –3 dB point — is what matters, and overload recovery can dominate it. Among the COSINE amplifier portfolio we stock, COS8051, COS8091, COS8042 and COS2353 cover 5 V and 12 V high-speed needs from general-purpose through video-class speeds.
Alternative & Cross-Reference Parts (for reference)
The devices below are commonly used industry parts in the same functional class. They are listed for identification and compatibility-engineering reference only. A cross-reference is not a guarantee of pin-to-pin or 100% functional equivalence — package, pinout, electrical parameters and temperature drift can differ between devices. Always verify against the original manufacturer's datasheet before substituting any part.
| Manufacturer | Typical part(s) | Class / note |
|---|---|---|
| Texas Instruments | OPA350 / OPA355 | Wideband, RRIO |
| Texas Instruments | THS4001 / THS4500 | High-speed |
| Analog Devices | ADA4807 / ADA4851 | High-speed, low power |
| Analog Devices | AD8065 / AD8045 | FastFET op-amp |
| Texas Instruments | LMH6629 | Ultra-low-noise, high speed |
| Maxim Integrated | MAX410 / MAX4230 | High-speed |
Mentioned brands (Analog Devices®, Texas Instruments®, Maxim Integrated®, Microchip®, STMicroelectronics®) are trademarks of their respective owners. Jingteng Electronics is an independent distributor and is not affiliated with, authorized by, or an agent of any semiconductor manufacturer.
Related COSINE Precision Amplifiers In Stock
| Part number | |
|---|---|
| COS8051 5V high-speed | Check stock & quote |
| COS8091 5V high-speed | Check stock & quote |
| COS8042 12V high-speed | Check stock & quote |
| COS2353 5V high-speed | Check stock & quote |
Frequently Asked Questions
Bandwidth and slew rate — which limits me first?
Small-signal response is set by gain-bandwidth product; large-signal response (especially fast edges) is set by slew rate. A 100 MHz part with poor slew rate will still distort a large, fast step, so check both against your actual amplitude and edge rate.
What is settling time for?
Settling time to a specified accuracy governs ADC driving and multiplexed channels. A part can have high bandwidth yet settle slowly because of overload recovery and ringing — read the settling-time plot at your accuracy target.
Do I need a high-speed part for video?
Video and other wideband, fixed-gain paths need both high GBP and low differential gain/phase error. General-purpose precision parts fail on bandwidth; dedicated high-speed devices are the right tool.
Recommended next steps
If you are sourcing any of the parts mentioned in this guide, we can help you confirm stock, pricing, and lead times quickly.
- Upload your BOM — send your full parts list and receive a consolidated quote within 2 business hours.
- Browse related in-stock lines: Amplifiers / Data Conversion · Power Management ICs.
- Contact our team for hard-to-find or end-of-life components.
Trademark & Cross-Reference Notice
COSINE (科山芯创) is a registered trademark of its respective owner. References on this page to COSINE part numbers, and any comparison to devices from other manufacturers, are provided for identification and compatibility-engineering purposes only, indicating the function, package and parametric class a given part belongs to. Jingteng Electronics (Shenzhen) is an independent distributor, not an authorized agent or affiliate of COSINE or any other semiconductor manufacturer. A cross-reference does not imply pin-to-pin or 100% functional equivalence; before substituting any device, verify the package, pinout, electrical parameters and the original datasheet. Product availability, pricing and date code are confirmed at quotation.
About Jingteng Electronics
Jingteng Electronics (Shenzhen Jingteng Electronics Technology Co., Ltd.) is an independent distributor of electronic components, focused on hard-to-find and obsolete ICs, analog and mixed-signal devices. We source through long-verified, traceable channels and support BOM matching, small-lot sampling and volume inquiries. Contact us for a quote, or upload your BOM for a consolidated quote.
