AS608 Optical Fingerprint Sensor Fingerprint Module

SKU: FA2037-1
Supply Voltage

DC 3.3V – 6.0V
Operating Current

<60mA (Typical)
Peak Current

<120mA
Fingerprint Capacity

300 Templates (Standard)
Resolution

500 DPI
Window Area

15.3mm x 18.2mm
Verification Speed

< 0.2 seconds
Search Time

< 0.5 seconds (for 100 templates)
Interface

UART (TTL) / USB 1.1
Baud Rate

9600 – 115200 bps (Default: 57600)
False Acceptance Rate (FAR)

< 0.001%
False Rejection Rate (FRR)

< 1.0%
Product Description
The AS608 is one of the most popular and reliable optical fingerprint modules on the market, known for its high-speed processing and ease of integration. This all-in-one biometric solution features a built-in high-performance DSP (Digital Signal Processor) that performs image rendering, feature calculation, and template searching entirely on-board.
Designed for versatility, the AS608 works seamlessly with a wide range of microcontrollers via a simple serial interface. It is a “complete” system, meaning it stores fingerprint data in its internal Flash memory, allowing it to function as a standalone security gatekeeper. Whether you are a developer building a custom IoT security device or a business looking for a cost-effective access control component, the AS608 provides professional-grade biometric authentication in a compact package.
Key Features
  • High-Speed Matching: Advanced internal algorithms allow for fingerprint matching (1:N) in less than one second, even with a large database of users.
  • Large Storage Capacity: Capable of storing up to 300 fingerprint templates (standard version), making it suitable for small to medium-sized business environments.
  • Low Power Consumption: Optimized for battery-operated devices with a low operating current and a fast “wake-to-scan” response.
  • Secure Data Storage: Fingerprint templates are stored in non-volatile Flash memory, ensuring user data is preserved even during power outages.
  • Adjustable Security Levels: Configure the matching threshold (Security Levels 1–5) to adjust the sensitivity based on your specific security needs.
  • Universal Compatibility: Supports UART (TTL) for microcontrollers and USB 1.1/2.0 for direct PC connection.
Usage Scenarios
  • Individual/Maker Projects: Biometric door locks, “Start” buttons for vehicles or PCs, secure jewelry boxes, and personalized medicine dispensers.
  • Business Applications: Staff time-attendance systems, restricted area access control (server rooms, labs), secure locker rentals, and point-of-sale (POS) authorization.
Q: Can I use this sensor with an Arduino or Raspberry Pi?

Yes. The AS608 is fully compatible with any microcontroller that has a Serial/UART port. There are extensive open-source libraries available (such as the Adafruit Fingerprint Library) to make setup fast and easy.

Q: Does this module store an image of my fingerprint?

No. For privacy and security, the module converts the fingerprint image into a mathematical “template” (feature map). It is impossible to reconstruct an actual fingerprint image from this stored data.

Q: What is the difference between 1:1 and 1:N matching?

1:1 is verification (the user enters an ID and then scans their finger to prove who they are). 1:N is identification (the user just scans their finger, and the module searches the entire database to find a match).

Q: How do I enroll a new fingerprint?

Enrollment is done through software commands. Usually, you scan the same finger twice; the module compares them to create a high-quality master template and assigns it a unique ID number (e.g., User #1, User #2).

Q: Can I connect this directly to my computer via USB?

Yes, the AS608 supports a USB interface. You can use Windows-based testing software to enroll users and manage the database directly from your PC.

Q: Is it okay to use this sensor outdoors?

The AS608 is an optical sensor and is sensitive to direct sunlight and extreme moisture. If used outdoors, it should be placed under a cover or inside a weather-resistant housing to ensure consistent performance.

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