DS28E25P+T - 1-Wire SHA-256 Authenticator, 4Kb EEPROM, TSOC-6
部品番号: DS28E25P+T ✓ 生産中| 数量 | 単価 | 小計 |
|---|---|---|
| 1 | $1.95 | $1.95 |
| 10 | $1.78 | $17.80 |
| 100 | $1.62 | $162.00 |
| 500 | $1.45 | $725.00 |
| 1,000 | $1.3 | $1,300.00 |
DS28E25P+T 概要
What is a Secure Authenticator? A secure authenticator is a specialized IC that stores a secret key in protected memory and performs a cryptographic challenge-response handshake with a host controller, allowing the host to verify that a peripheral (sensor, battery, accessory, or consumable) is genuine before granting access, transferring data, or activating functionality. Within the broader taxonomy, the DS28E25 sits in the hierarchy: secure authenticator -> authentication IC -> security IC -> semiconductor. Its DeepCover family designation indicates multilayer physical security protecting the on-chip secret key from invasive and non-invasive attack.
The DS28E25 implements bidirectional SHA-256 challenge-and-response authentication using a 256-bit secret and a unique 64-bit ROM ID that is factory-lasered into each die. The device integrates an on-die SHA-256 accelerator and a 4 Kbit (512-byte) user EEPROM array partitioned into four 128-byte pages, with each page lockable to support write-protect-once, write-protect-permanently, and OTP/secret modes. Operating temperature spans -40 C to +85 C (industrial grade), and the part is rated for a typical 1-Wire pull-up of 2.2 kohm with strong ESD protection on the IO/data pin.
The DS28E25 is widely used to authenticate medical sensors, batteries and chargers, printer cartridges, industrial sensors, and any peripheral whose authenticity directly affects safety, IP protection, or revenue. By placing an inexpensive DS28E25 on a consumable or accessory and storing a unique secret in its EEPROM, OEMs can deter cloning and gray-market substitution. Compared with software-only authentication, the DS28E25 places the secret inside a tamper-resistant IC, making key extraction materially harder.
When laying out the PCB, keep the DQ/IO trace short and place a single 2.2 kohm pull-up to the host-side 1-Wire rail; avoid stubs and long parallel runs to other digital lines. Ensure the host GPIO used for the 1-Wire bus is open-drain capable, and budget for the 1-Wire reset/presence pulse timing as specified in the datasheet timing section.
ドロップイン代替品: DS28E25P+T — 同一パッケージでピン互換。PCBの作り直しが必要な異なるパッケージの部品は除外されています。
クイック比較ツール — 並列比較する代替部品を選択:
DS28E25P+
✅ ドロップイン📋 参考代替品（カタログ未掲載）
DS28E25P+T 仕様
| Product Type | Secure Authenticator IC |
| Authentication Algorithm | SHA-256 (FIPS 180-3) |
| User EEPROM Size | 4 Kbit (512 bytes) |
| Unique ROM ID | 64-bit factory-lasered |
| Communication Interface | Maxim 1-Wire |
| 電源電圧 | 3.0 V to 3.6 V |
| 動作温度範囲 | -40 C to +85 C |
| パッケージ | 6-TSOC (0.148", 3.76 mm width) |
| 実装タイプ | Surface Mount |
| ピン数 | 6 |
| Temperature Grade | Industrial |
| Packaging | Tape & Reel ("+T" suffix) |
| Programming Interface | 1-Wire (single IO pin) |
| Security Feature | DeepCover tamper protection |
| RoHS ステータス | Compliant |
DS28E25P+T ピン構成
| ピン 1 | IO — 1-Wire data input/output (open-drain, requires external pull-up) |
| ピン 2 | NC — Not connected (per datasheet) |
| ピン 3 | NC — Not connected (per datasheet) |
| ピン 4 | NC — Not connected (per datasheet) |
| ピン 5 | GND — Ground reference |
| ピン 6 | NC — Not connected (per datasheet) |
主な用途
DS28E25P+T の用途: 6 件s: Medical Sensor Authentication, Battery Pack Authentication, Printer Cartridge / Consumable Cloning Protection, Industrial Sensor Anti-Counterfeiting, Accessory Authentication for Embedded Platforms, IoT Device Identity and Secure Boot Validation.
Medical Sensor Authentication
The DS28E25P+T's 4 Kbit user EEPROM and SHA-256 engine authenticate disposable medical sensors such as pulse-oximetry probes, glucose test strips, and continuous-monitoring patches. Its 3.0 V to 3.6 V supply rail and parasitic-power support simplify single-wire host interfaces on patient-worn devices. DeepCover tamper resistance protects the per-device secret against invasive probing, which is critical for FDA-regulated medical accessory ecosystems.
おすすめ
Battery Pack Authentication
Power-tool, e-bike, and medical-cart battery packs use the DS28E25P+T to verify cell authenticity before authorizing charge or discharge cycles. The 4 Kbit EEPROM stores cycle-count history, firmware revision, and per-cell calibration constants that the charger reads after a SHA-256 challenge-response. Single-wire operation reduces wiring on the battery management board while DeepCover protection deters aftermarket cell substitution.
おすすめ
Printer Cartridge / Consumable Cloning Protection
OEM ink and toner cartridges embed the DS28E25P+T to prevent third-party refills that bypass consumable-revenue models. The printer's controller issues a SHA-256 challenge on the cartridge's 1-Wire line; only a genuine cartridge returns the expected response because the secret never leaves DeepCover-protected storage. The 4 Kbit EEPROM also logs page count, ink-remaining estimates, and manufacturing lot data used for warranty analytics.
おすすめ
Industrial Sensor Anti-Counterfeiting
Process-control transmitters and field-installed sensors authenticate themselves to PLCs and SCADA hosts via the DS28E25P+T, preventing counterfeit or out-of-calibration devices from injecting spurious data into safety loops. The industrial -40 C to +85 C temperature range tolerates outdoor panel and factory-floor installations. The 4 Kbit user EEPROM also stores calibration coefficients that the host can verify against SHA-256-signed metadata.
おすすめ
Accessory Authentication for Embedded Platforms
Single-board computers and embedded modules authenticate docking accessories, expansion boards, and protected firmware using the DS28E25P+T. By placing one on each accessory, the SoC can refuse to load firmware or activate high-power functions unless the SHA-256 handshake succeeds. The single-wire interface minimizes GPIO usage, leaving the rest of the SoC's pin budget for application functions. The compact 6-TSOC footprint fits inside small form-factor modules.
おすすめ
IoT Device Identity and Secure Boot Validation
IoT edge nodes attach the DS28E25P+T to verify peripheral sensor identity before enabling encrypted communications back to the cloud. The 1-Wire bus lets a low-cost MCU perform authentication with a single GPIO, conserving pins for radios and power-management blocks. The 64-bit ROM ID plus user EEPROM provide per-device identifiers that feed into TLS certificate derivation, enabling secure-boot and anti-tamper workflows in volume-deployed IoT fleets.
おすすめ
おすすめ製品の概要
エンジニアリング参考データ: DS28E25P+T — 比較、設計ガイダンス、コンプライアンス情報。
選定ガイド
代替品との比較
| パラメータ | この製品 | DS28E25P+ | DS28E25+ |
|---|---|---|---|
| Package | 6-TSOC (0.148", 3.76 mm) | 6-TSOC (0.148", 3.76 mm) - same | TO-92-2 (through-hole) - different |
| Brand | Analog Devices / Maxim Integrated | Analog Devices / Maxim Integrated | Analog Devices / Maxim Integrated |
| Authentication Algorithm | SHA-256 (FIPS 180-3) | SHA-256 (FIPS 180-3) | SHA-256 (FIPS 180-3) |
| User EEPROM | 4 Kbit (512 bytes) | 4 Kbit (512 bytes) | 4 Kbit (512 bytes) |
| Communication Interface | 1-Wire | 1-Wire | 1-Wire |
| Supply Voltage | 3.0 V to 3.6 V | 3.0 V to 3.6 V | 3.0 V to 3.6 V |
| Operating Temperature | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C |
| Packaging Form | Tape & Reel ("+T") | Bulk (tube/tray) | Bulk (tube) - different package |
主な差別化要因
- Tape-and-reel packaging optimized for SMT production （vs DS28E25P+)
- Compact 6-TSOC surface-mount package （vs DS28E25+ (TO-92-2))
- Maxim 1-Wire proprietary protocol support （vs DS28E16 (I2C SHA-256 authenticator))
設計ノート
Estimated: route the 1-Wire IO line from the host MCU to the DS28E25P+T pin 1 with the shortest practical trace, place a single 2.2 kohm pull-up resistor to the 3.3 V rail close to the host side, and avoid routing the IO line parallel to or near switching power converter traces. Add an ESD protection diode (such as the Analog Devices MAX3207A or equivalent) on the IO line if the connector is exposed to user contact.
The DS28E25P+T operates from 3.0 V to 3.6 V but can also be parasitically powered from the 1-Wire data line during read transactions; however, EEPROM write cycles require a stable external VDD. Decouple VDD with a 100 nF ceramic capacitor placed within 3 mm of the device, and ensure the host's 3.3 V rail stays within 5% tolerance during the 10 ms write window specified in the datasheet.
Do not assume the DS28E25 family supports multi-drop on the 1-Wire bus for simultaneous authentication - while the protocol is multi-drop capable, only one transaction at a time should run to avoid bus contention. Also, do not skip the 64-bit ROM ID discovery step: the host must enumerate the unique 64-bit ID of each DS28E25 on the bus before issuing the SHA-256 challenge, or the device will not respond.
コンプライアンス情報
RoHS and lead-free status per Analog Devices / Maxim Integrated product page. AEC-Q100 automotive qualification status not specified in the provided data. Halogen-free status not explicitly listed.
