Authentication chip in a through-hole package
The DS28E25+T is an Authentication Chip from the Analog Devices DeepCover® series, a security-focused family designed for applications requiring cryptographic authentication and secure key storage. Housed in a TO-92-3 package (TO-226-3 with formed leads), it is a through-hole mounted device — the three-lead transistor outline is a standard footprint that hand-solders or wave-solders without special reflow profiling, though the lead pitch and body size mean it sits above the board, so pick-and-place requires a tape feeder or tube feed, not a tray.
Active production and compliance status
The Tape & Reel (TR) and Cut Tape (CT) packaging options mean the part ships on standard 13-inch reels for automated assembly or in cut-tape lengths for prototype and low-volume builds. No official successor or pin-compatible alternative is published by the manufacturer.
Where the part fits in a BOM
Classified under Microcontrollers & Processors (MCU / MPU / DSP), the DS28E25+T is a dedicated security coprocessor — it does not run user firmware but executes a fixed authentication protocol. The TO-92-3 footprint is shared with many temperature sensors and small-signal transistors, so the board layout is straightforward: the three leads are VDD, GND, and the 1-Wire data line. Target applications are Authentication and Security — typically consumable authentication (printer cartridges, medical disposables), accessory validation, or secure credential storage. The DeepCover® series embeds tamper-detection and cryptographic countermeasures against invasive attacks.