Basic Information Brand: SCTF (Startimer) Component Type: SMD Surface-Mount Active Quartz Crystal Oscillator (Active Crystal) Model Code Segmentation Analysis SX3M: Product series, corresponding to 3225 (3.2×2.5mm) 4-pin SMD active crystal oscillator 3.6864M: Nominal frequency 3.6864 MHz 20: Frequency tolerance at 25°C ±20 ppm F30: Frequency stability over full temperature range (-40~+85°C) ±30 ppm TNN: Tape-and-reel packaging, standard pin definition, lead-free RoHS compliant suffix Core Electrical Specifications Nominal Frequency: 3.6864 MHz Frequency Accuracy: ±20 ppm at 25°C Temperature Stability: Overall deviation ±30 ppm over -40°C ~ +85°C Operating Voltage: Wide voltage range 1.62 V ~ 3.63 V (compatible with 1.8V/2.5V/3.3V systems) Output Level: CMOS output Maximum Operating Current: 10 mA Output Load: Typical 15 pF Duty Cycle: 45% ~ 55% Start-up Time: ≤ 5 ms Mechanical & Environmental Parameters Package Dimensions: SMD 3225, 3.2 mm × 2.5 mm, 4-pin SMT Operating Temperature Range: Industrial-grade -40°C ~ +85°C Storage Temperature: -55°C ~ +125°C Process: Lead-free, RoHS compliant Packaging: Standard 8mm plastic tape-and-reel Typical Applications 3.6864MHz is a classic UART serial port reference clock, commonly used in: MCUs, serial communication modules, industrial control boards, IoT devices, smart home systems, consumer digital circuits