PCB boards adapted for smart door locks are security-focused components that control access authentication, lock/unlock mechanisms, and status monitoring—designed to withstand harsh environments (temperature fluctuations, humidity) and prevent unauthorized access. These PCBs prioritize security, durability, and low power consumption (to extend battery life, often 6–12 months per charge).

Key functional blocks include: an authentication module (supporting fingerprint sensors, RFID readers, or keypad inputs, with encryption chips like STMicroelectronics STSAFE to store biometric data securely), a motor control circuit (with MOSFETs to drive the lock’s motor for automated opening/closing), and a communication module (Bluetooth Low Energy (BLE) or Wi-Fi for smartphone app control and status updates). PCBs use waterproof FR-4 material (Tg ≥150°C) with 1–2 oz copper layers, and feature a 3–4 layer design to fit the lock’s narrow housing (typically 50mm×80mm).

Safety features include anti-tamper circuits (triggering alarms if the lock is forced open), low-battery detection, and emergency power input (for charging when batteries die). Many smart lock PCBs also integrate door status sensors (to detect if the door is closed) and alarm circuits. For example, PCB boards for Xiaomi Smart Door Locks use dual-core MCUs for redundant authentication, enhancing security. These PCBs are critical for smart lock reliability and safety—ensuring secure access control and long-term operation—making them essential for home security and smart building markets.