ATSHA204A-STUCZ-T - SHA-256 CryptoAuth IC SOT-23-3 | Microchip
부품 번호: ATSHA204A-STUCZ-T ✓ 활성| 수량 | 단가 | 합계 |
|---|---|---|
| 1 | $0.62 | $0.62 |
| 10 | $0.55 | $5.50 |
| 100 | $0.46 | $46.00 |
| 500 | $0.39 | $195.00 |
| 1,000 | $0.34 | $340.00 |
ATSHA204A-STUCZ-T 개요
A cryptographic authentication IC, sometimes called a crypto element or secure authenticator, is a specialized security IC that stores secret keys in protected hardware memory and performs challenge-response computations on-chip so that secrets never leave the device. It sits within the broader hierarchy of security integrated circuits: secure authenticator, CryptoAuthentication family member, hardware security IC, semiconductor. This class of part provides a far stronger root of trust than software-only key storage in a general-purpose microcontroller.
Key features include the SHA-256 hash engine, 4.5Kb EEPROM array usable for key storage, miscellaneous read/write data, read-only data, secret data, consumption logging, and security configuration, plus a compact single-wire interface that consumes minimal host-controller GPIO resources. The SOT-23-3 package minimizes PCB footprint, making the part cost-effective and space-efficient.
The device implements a flexible command set for challenge-response protocols in which the host sends a random challenge, the ATSHA204A computes an HMAC-style SHA-256 digest over the challenge plus an internal secret key, and only a device holding the correct key produces the expected response. Internal security features guard against side-channel and physical attacks on stored keys.
Typical applications include consumable and accessory authentication (printer cartridges, battery packs, medical consumables), networked node identification and anti-counterfeiting, and secure firmware or message checking in embedded systems.
Design tip: dedicate a single host GPIO to the single-wire bus and follow the datasheet timing requirements strictly, since the one-wire protocol is timing-sensitive; verify that supply decoupling meets the datasheet recommendation.
This page synthesizes distributor availability data, package and pinout guidance, and practical design notes not consolidated in the manufacturer datasheet.
드롭인 대체품: ATSHA204A-STUCZ-T — 동일 패키지, 핀 호환. PCB 재작업이 필요한 다른 패키지 부품은 제외됩니다.
빠른 비교 도구 — 나란히 비교할 대체 부품을 선택하십시오:
ATSHA204A-STUCZ
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
ATSHA204A-STUCZ-T 최대 정격 & 전기적 특성
| Product Type | Cryptographic Authentication IC (CryptoAuthentication) |
| Hash Algorithm | SHA-256 |
| EEPROM Memory | 4.5 Kb |
| 인터페이스 | Single-Wire (1-Wire) |
| 패키지 | SOT-23-3 (TO-236-3, SC-59) |
| 실장 유형 | Surface Mount |
| 핀 수 | 3 |
| Key Storage Security | Protected EEPROM key storage (secrets never leave device) |
| EEPROM Functions | Key storage, read/write data, read-only data, secret data, consumption logging, security configuration |
| Authentication Method | Challenge-response with SHA-256 digest |
| RoHS 상태 | Compliant |
ATSHA204A-STUCZ-T 핀 구성
| 핀 1 | VCC — Power supply input |
| 핀 2 | GND — Ground reference |
| 핀 3 | SDA (Single-Wire I/O) — Single-wire bidirectional data/communication pin |
일반적인 애플리케이션
ATSHA204A-STUCZ-T 적합 용도: 6 애플리케이션s: Consumable and Accessory Authentication, Anti-Counterfeiting for Networked Peripherals, Secure Boot and Firmware Verification Support, Battery Pack Identification, IoT Node Identity and Secure Commissioning, Medical Consumable and Instrument Pairing.
Consumable and Accessory Authentication
The ATSHA204A-STUCZ-T is ideally suited to proving that a cartridge, battery pack, probe, or accessory is genuine. Its SHA-256 engine and 4.5Kb protected EEPROM hold a unique per-item secret that never leaves the chip, so a host instrument can issue a random challenge and verify the returned digest before enabling the consumable. Mounted inside the consumable in a 3-pin SOT-23 package, the device adds negligible cost and board area, and the single-wire interface needs only one contact pad. Cloners cannot copy the digest without the key, making counterfeiting economically impractical.
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Anti-Counterfeiting for Networked Peripherals
Networked peripherals such as sensors, dongles, and certified cables benefit from hardware root-of-trust identification using the ATSHA204A-STUCZ-T. The peripheral embeds the SOT-23 device; on connection, the host controller performs a challenge-response exchange over the single-wire bus and only enables full functionality after the SHA-256 digest matches. The 4.5Kb EEPROM can also store read-only serial and model data for inventory and tracing. Because the whole device occupies three pins and consumes minimal quiescent current, it fits even passive-style cable assemblies where board space and power are severely constrained.
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Secure Boot and Firmware Verification Support
In embedded systems, the ATSHA204A-STUCZ-T supports secure boot validation: the host stores a digest or key-derived secret in the authenticator and compares it against the hash of firmware images before execution. The SHA-256 algorithm matches common firmware hashing pipelines, so verification integrates directly with existing toolchains. The device's protected EEPROM keeps the reference secret out of external flash where it could be read by attackers. Its single-wire timing protocol should be serviced with interrupts disabled during transfers, so verification is best performed early in boot when the system is single-threaded and timing is deterministic.
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Battery Pack Identification
Smart battery packs for portable and medical devices use the ATSHA204A-STUCZ-T to identify genuine packs and log usage. The authenticator's EEPROM consumption-logging counters let the pack record charge cycles that the charger can read at each connection, enabling remaining-life policies and warranty enforcement. The 3-pin SOT-23 survives the thermal and vibration environment of a pack, and the single-wire bus can share the existing battery identification line without adding connector pins. Only a genuine Microchip-programmed device returns valid responses, preventing uncertified third-party packs from being accepted by chargers designed for safety-critical equipment.
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IoT Node Identity and Secure Commissioning
Mass-produced IoT nodes use the ATSHA204A-STUCZ-T as an immutable hardware identity. During manufacturing, each device is programmed with a unique secret in its 4.5Kb EEPROM; the cloud backend then registers the corresponding SHA-256 challenge-response profile, allowing the node to prove itself on first network connection without storing long credentials in firmware. At sub-dollar unit pricing in volume (around $0.34 at 1000 units as of 2026-10-12), the authenticator adds negligible bill-of-materials cost while eliminating cloned-node attacks. The single-wire interface consumes only one MCU GPIO on the most cost-reduced node designs.
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Medical Consumable and Instrument Pairing
Medical analyzers must guarantee that only validated consumables - test cartridges, calibration kits, reagent packs - run on the instrument. The ATSHA204A-STUCZ-T provides this pairing: the instrument challenges the consumable's authenticator and verifies the SHA-256 response before allowing a test cycle, with lot and expiry data stored in the EEPROM read-only regions. The device's surface-mount SOT-23 package tolerates standard reflow assembly of disposable cartridges, and its low pin count suits small flexible-PCB contact pads. Traceability data combined with cryptographic identity supports regulatory documentation of consumable provenance and usage.
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추천 제품 요약
엔지니어링 참조 데이터: ATSHA204A-STUCZ-T — 비교, 설계 지침 및 규정 준수 정보.
선택 가이드
대체품과의 비교
| 파라미터 | 이 제품 | ATSHA204A-STUCZ |
|---|---|---|
| Package | SOT-23-3 (TO-236-3) | SOT-23-3 - same |
| Brand | Microchip Technology | Microchip Technology |
| Hash Algorithm | SHA-256 | SHA-256 |
| EEPROM Size | 4.5 Kb | 4.5 Kb |
| Interface | Single-Wire | Single-Wire |
| Pins | 3 | 3 |
| Mounting Type | Surface Mount | Surface Mount |
| Delivery Format | Tape & Reel (-T suffix) | Non-reel ordering code |
주요 차별점
- Lowest pin count in the CryptoAuthentication portfolio (vs ATSHA204A-TSU (SOIC-8 variant))
- Single-wire interface minimizes host GPIO cost (vs ATECC608A (I2C interface))
- Symmetric SHA-256 architecture keeps cost minimal (vs ATECC608A (ECDSA asymmetric))
설계 노트
The single-wire interface of the ATSHA204A-STUCZ-T encodes bits using pulse-width timing, so host firmware must service the bus with deterministic timing. Disable interrupts or use a low-jitter bit-bang routine during transfers; long ISRs can corrupt a transaction. Keep the SDA trace short (ideally under 10 cm) and, if the bus is routed near switching regulators, consider a light pull-up per the Microchip datasheet wake and timing sections. Prototypes should include a test point on the I/O line for protocol debugging with a logic analyzer.
Decouple the ATSHA204A-STUCZ-T VCC pin with a 100 nF ceramic capacitor placed within a few millimeters of pin 1, shared with the host supply rail. Because the device draws current in short bursts during SHA-256 computation, adequate local decoupling prevents supply droop from resetting the device mid-command. Estimated: a 100 nF cap supplying a millisecond-class compute burst keeps rail ripple well below typical MCU-level noise margins; verify actual sleep and active current figures against the Microchip ATSHA204A datasheet for your supply-voltage condition.
Personalization is mandatory: a factory-fresh ATSHA204A ships unconfigured, and the authentication system only works after the secret key and configuration zone are programmed and locked. Locking is permanent - an incorrectly provisioned device cannot be rekeyed, so validate the provisioning flow on engineering samples before committing to a locked production run. Plan key diversification so each unit gets a unique derived key; storing one master key in every device means a single extraction compromises the entire product line.
규정 준수 정보
RoHS compliance per DigiKey/Mouser product listings. REACH, halogen-free, and conflict-minerals declarations were not present in the provided data - obtain current certificates from the Microchip product page.
