In high-speed signal chains and portable battery-powered systems, the propagation delay, input common-mode range, and power consumption of comparators often present mutually constraining design bottlenecks. The MAX999 is a single-channel solution optimized specifically to address this trade-off: it maintains a propagation delay in the 4.5 ns range while extending the input common-mode range beyond the power rails and minimizing board space with its SOT23-5 package. For R&D and procurement teams seeking immediate availability of the MAX999, Mingjiada Electronics offers genuine stock support for this model.
Product Positioning: Single-channel, Ultra-high-speed, Ultra-wide-swing
The MAX999 belongs to the MAX961–MAX964/MAX997/MAX999 series, manufactured by Analog Devices (formerly Maxim Integrated), and is positioned as a low-power, ultra-high-speed comparator with internal hysteresis. This device is optimized for +3V or +5V single-supply operation. Its single-channel architecture eliminates the redundant power consumption and wasted board space associated with dual- or quad-channel devices in applications requiring only a single comparison channel.
“Extended swing” is one of the MAX999’s most distinctive features. Its input common-mode range extends 100 mV beyond the supply rails (Beyond-the-Rails), meaning that with a single 3V or 5V power supply, the input can still handle signals slightly above VCC or slightly below GND, eliminating the need for additional level-shifting or negative power supply generation circuits. The output stage is similarly rail-to-rail: it can sink or source 4 mA of current within 0.52 V of GND and VCC, and is compatible with TTL/CMOS logic levels.
MAX999 Key Specifications at a Glance
Number of Channels: Single
Propagation Delay: 4.5 ns (5 mV overdrive)
Supply Voltage Range: 2.7 V to 5.5 V
Supply Current per Channel: 5 mA (typical)
Internal Hysteresis: 3.5 mV
Input Offset Voltage: 1.5 mV (maximum)
Input Bias Current: 15 µA (maximum)
Common-Mode Rejection Ratio: 80 dB (typical)
Output Type: TTL/CMOS-compatible, push-pull
Package: 5-pin SOT23
Why the MAX999 Is Hard to Replace in High-Speed Detection
The Practical Value of 4.5 ns Propagation Delay. In high-speed sampling, line reception, and threshold detection, the comparator’s response speed directly determines the system’s time resolution. The MAX999’s 4.5 ns propagation delay (under 5 mV overdrive conditions) enables it to capture nanosecond-level edge events, making it suitable for applications such as pulse laser timing discrimination, high-speed sample-and-hold triggering, and zero-crossing detection.
Internal hysteresis eliminates output jitter. High-speed comparators are prone to multiple flip-flops caused by noise when the input signal approaches the threshold. The MAX999 incorporates approximately 3.5 mV of internal hysteresis, which effectively suppresses high-frequency oscillations at the output without significantly reducing input resolution, resulting in clean and crisp switching. For signals with superimposed noise in industrial environments or over long transmission lines, this feature significantly reduces the probability of false triggering in downstream counting or logic circuits.
Balance between 5 mA power consumption and a single-supply architecture. Among ultra-high-speed comparators, a per-channel supply current of 5 mA is relatively low. Combined with a wide single-supply voltage range of 2.7 V to 5.5 V, the MAX999 can be used in 3.3 V portable devices or directly integrated into 5 V communication boards without requiring an additional voltage regulator rail. Power consumption can be further reduced in shutdown mode (supported by some models in the same series), but the MAX999 itself excels in low quiescent power consumption and its SOT23-5 micro-package, making it suitable for designs with both space and power constraints.
Typical Applications
According to ADI’s official data sheets and industry application materials, typical applications for the MAX999 include the following:
GPS receivers and portable battery-powered systems. The wide input swing capability allows front-end signals to be fed directly into the comparator without requiring a negative power supply; the SOT23-5 package and 5 mA current help extend battery life.
High-speed sampling circuits and line receivers. The 4.5 ns propagation delay provides fast decision thresholds for sampling clock generation and high-speed differential/single-ended line reception.
Threshold detectors, frequency discriminators, and zero-crossing detectors. Internal delay suppresses false zero-crossing pulses caused by noise in zero-crossing detection, improving measurement and triggering accuracy.
Pulsed laser ranging and time-of-arrival discrimination. In LiDAR or short-pulse ranging applications, the MAX999 has been used to build time-of-arrival discrimination channels, working in conjunction with gate circuits to rapidly determine the arrival time of echoes.
Mingjiada Electronics: MAX999 In-Stock Supply and Procurement Support
Mingjiada Electronics (Shenzhen Mingjiada Electronics Co., Ltd.) was founded in 1996 and has long specialized in the ADI (formerly Maxim) product line. With a inventory of over one million SKUs, the company provides genuine, in-stock supply for R&D prototyping and mass production. For the MAX999 series, Mingjiada supplies common part numbers with suffixes such as MAX999EUK, MAX999EUK+T, and MAX999AAUK+T. These devices are housed in standard 5-pin SOT23 packages and cover the industrial temperature range of −40°C to +85°C (some documentation specifies up to +125°C).
Whether for small-batch sample requirements during the R&D phase or full-reel/full-tape purchases during mass production, Mingjiada supports flexible quantity combinations to shorten the cycle from type selection and verification to bulk delivery. If you have procurement needs for the MAX999, please contact Mingjiada Electronics directly to confirm real-time inventory and lead times.
Frequently Asked Questions (FAQ)
Q: What is the main difference between the MAX999 and the MAX997?
A: Both are single-channel ultra-high-speed comparators with similar core propagation delays and overshoot characteristics. The main difference is that the MAX997 additionally offers a shutdown mode, which reduces the current per comparator to approximately 270 µA when active; the MAX999, on the other hand, focuses on providing basic comparison functionality in a smaller SOT23-5 package, making it suitable for designs that do not require shutdown control but are sensitive to board space.
Q: Can the MAX999 directly handle inputs slightly higher than 3.3V when operating from a single 3.3V power supply?
A: Yes. Its input common-mode range extends 100 mV beyond the supply rail; when powered by 3.3V, the input can withstand a common-mode voltage of approximately 3.4V without requiring external level shifting.
Q: Are the MAX999 devices supplied by Mingjiada genuine original products?
A: Mingjiada Electronics is an independent distributor with a long history of handling the ADI (formerly Maxim) product line. Our supply channels include the original manufacturer and authorized distributors, and we provide genuine original products in stock. When purchasing, we recommend requesting batch information and quality documentation from our sales team to meet your project’s incoming inspection requirements.
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