ATSHA204A-MAHDA-T - SHA-256 CryptoAuthentication IC | Microchip
料号： ATSHA204A-MAHDA-T ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $0.62 | $0.62 |
| 10 | $0.55 | $5.50 |
| 100 | $0.44 | $44.00 |
| 500 | $0.38 | $190.00 |
| 1,000 | $0.33 | $330.00 |
| 3,000 | $0.29 | $870.00 |
ATSHA204A-MAHDA-T 概述
A cryptographic authentication IC is a specialized security chip that stores secret keys in protected memory and performs challenge-response computations entirely on-chip, so secrets never appear on an external bus. Within the system hierarchy, it sits below the main processor as a security co-processor, complementing microcontrollers, memory ICs, and power management ICs in an embedded design. The ATSHA204A belongs to Microchip's CryptoAuthentication family, which the manufacturer positions as its most cost-effective hardware authentication solution.
Key features include hardware SHA-256 computation, a 4.5Kb EEPROM organized as 16 zones supporting key storage, read-only data, consumption logging, and security configuration, and a flexible command set. The chip also integrates an SHA-256 HMAC/PRF engine, random number generation support, and diverse attack-protection mechanisms such as active shield overlays and key access controls defined by configuration fuses.
Technically, the device is a CMOS authenticator whose command interpreter processes Authenticate, Read, Write, DeriveKey, and MAC commands. Because key storage, hashing, and comparison occur inside the die, board-level probes cannot intercept secrets, addressing the fundamental weakness of software-only authentication. The shared-bus Single-Wire mode allows multiple ATSHA204A devices on one processor pin, useful for consumable identification such as ink tanks or spare parts.
Typical applications include clone prevention for spare parts and consumables, secure firmware boot authentication, secure network node identity, and consumable lifecycle tracking. The MAHDA-T variant specifically supports the I2C interface, making it a natural companion for microcontrollers and FPGA hosts.
Design consideration: configure the IO interface (Single-Wire versus I2C) and zone access policies before fusing the configuration zone, as these settings are permanent and directly determine key protection strength.
This page synthesizes verified distributor data, drop-in alternatives, pinout guidance, and practical design notes that are not consolidated in the manufacturer datasheet.
直接替换替代料： ATSHA204A-MAHDA-T ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
快速对比工具——选择替代料号进行并排对比：
ATSHA204A-MAHDA
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
ATSHA204-MAH-DA-T
✅ 直接替换📋 参考替代料（不在目录中）
ATECC508A-MAHTN-T
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
ATECC608A-MAHTN-T
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
ATSHA204A-MAHDA-T 最大额定值与电气特性
| Device Type | Cryptographic Authentication IC |
| Algorithm | SHA-256 (NIST) |
| EEPROM Density | 4.5 Kb |
| Key Size | 256 bit |
| EEPROM Organization | 256 x 16 |
| Number of Zones | 16 |
| 接口类型 | Single-Wire; I2C |
| Operating Voltage | 2 V to 4.5 V |
| Typical Operating Current | 0.5 mA |
| 工作温度范围 | -40C to +85C |
| 封装 | 8-UDFN (2x3 mm) with exposed pad |
| 安装类型 | Surface Mount |
| Packaging | Tape & Reel (T/R) |
| 存储器类型 | EEPROM, Serial - I2C |
| Technology | CMOS |
ATSHA204A-MAHDA-T 引脚配置
| 引脚 1 | SDA — I2C serial data (per datasheet, IO pin) |
| 引脚 2 | VCC — Power supply, 2 V to 4.5 V |
| 引脚 3 | NC — No connect (per datasheet) |
| 引脚 4 | NC — No connect (per datasheet) |
| 引脚 5 | SCL — I2C serial clock (per datasheet) |
| 引脚 6 | GND — Ground |
| 引脚 7 | NC — No connect (per datasheet) |
| 引脚 8 | NC — No connect (per datasheet) |
典型应用
ATSHA204A-MAHDA-T 适用于 6 应用s: Clone Prevention and Secure Boot, Consumable and Spare Part Authentication, Network and IoT Node Identity, Secure Firmware Intellectual Property Protection, Medical Consumable Tracking, Battery Pack Authentication.
Clone Prevention and Secure Boot
The ATSHA204A-MAHDA-T anchors secure boot and anti-cloning schemes: a 256-bit secret key stored in its 4.5Kb EEPROM computes an SHA-256 response to a host challenge entirely on-chip, so the key never appears on the I2C bus. Placed on the I2C rail of the main processor at 3.3 V, the host authenticates the board before executing firmware. Because hashing and key comparison occur inside the die, probing attacks cannot extract credentials, and the 16-zone memory permits separate keys for boot, firmware updates, and accessory validation. This makes it a low-cost (~$0.30 at 1000 pieces) alternative to more expensive secure elements where symmetric authentication suffices.
推荐
Consumable and Spare Part Authentication
OEM consumables such as ink tanks, batteries, medical probes, and industrial spare parts are authenticated with an ATSHA204A-MAHDA-T embedded in each cartridge or module. The Single-Wire interface lets multiple authenticators share one host GPIO pin, so a printer validating four color tanks uses only one processor pin total, as described in the Microchip datasheet sharing-the-interface section. Each consumable carries a unique 256-bit key; the host rejects clones with a failed challenge-response. Typical active current of 0.5 mA and automatic sleep keep the load on the cartridge cell negligible, extending consumable shelf life.
推荐
Network and IoT Node Identity
IoT and networked nodes use the ATSHA204A-MAHDA-T to generate and protect device identity data: the 4.5Kb EEPROM stores per-device serial numbers, certificates-adjacent data, and rotation keys, while the NIST SHA-256 engine produces hashed node identities for cloud onboarding. Operating from a 2 V to 4.5 V rail suits battery- and coin-cell-powered sensors; sleep-mode operation between authentications preserves energy budget. The 8-UDFN 2x3 mm footprint fits dense sensor PCBs, and the exposed pad simplifies grounding. Firmware teams integrate it with Microchip CryptoAuthentication libraries on common MCU stacks.
推荐
Secure Firmware Intellectual Property Protection
Equipment vendors protect firmware IP by encrypting images and binding the decryption check to an ATSHA204A-MAHDA-T: the bootloader hashes the encrypted image with an on-chip key and refuses execution on mismatch. Because the 16 zones can separate the IP-protection key from field-service keys, contract manufacturers can flash boards without access to the vendor's root secret. The -40C to +85C industrial rating and CMOS construction support factory-floor programmers. Configuring zone access policies before fusing is the critical design step, since configuration writes are permanent.
推荐
Medical Consumable Tracking
Medical diagnostic systems authenticate single-use cartridges and track usage with the ATSHA204A-MAHDA-T's consumption-logging EEPROM capability. Each disposable stores a secret and a usage counter; the analyzer verifies authenticity and refuses expired or counterfeit cartridges, supporting patient-safety and regulatory documentation goals. The 2 V to 4.5 V supply range integrates with low-voltage analyzer electronics, and the -40C to +85C range covers sterilization-adjacent storage conditions. On-chip SHA-256 computation keeps the authentication latency at the millisecond level over I2C, invisible to the operator.
推荐
Battery Pack Authentication
Power-tool and drone battery packs embed an ATSHA204A-MAHDA-T so chargers and hosts validate the pack before enabling charge or discharge. A 256-bit challenge-response over the pack's I2C bus confirms a genuine cell assembly, protecting revenue and preventing hazardous counterfeit packs from operating. The authenticator's 0.5 mA typical active draw is negligible versus pack management current, and sleep mode eliminates standby drain during storage. The 8-UDFN (2x3 mm) package withstands vibration-dominated environments, and the -40C to +85C rating matches outdoor battery operating windows.
推荐
推荐产品汇总
工程参考数据： ATSHA204A-MAHDA-T ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | ATSHA204A-MAHDA | ATSHA204-MAH-DA-T | ATECC508A-MAHTN-T | ATECC608A-MAHTN-T |
|---|---|---|---|---|---|
| Package | 8-UDFN (2x3 mm) EP | 8-UDFN (2x3 mm) EP - same | 8-UDFN (2x3 mm) EP - same | 8-UDFN (2x3 mm) EP - same | 8-UDFN (2x3 mm) EP - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Algorithm | SHA-256 | SHA-256 | SHA-256 | ECDSA + SHA-256 | ECDSA + SHA-256 |
| Interface | I2C (MAHDA variant) | I2C | Single-Wire; I2C | I2C / Single-Wire | I2C / Single-Wire |
| Operating Voltage | 2 V to 4.5 V | 2 V to 4.5 V | 2 V to 4.5 V | 2.0 V to 5.5 V | 2.0 V to 5.5 V |
| Lifecycle Status | Active | Active | Legacy (predecessor) | Active | Active |
| Relative Cost | Lowest cost in CryptoAuth portfolio | Same die | Comparable | Higher | Higher |
关键差异点
- Lowest-cost hardware authentication in Microchip's CryptoAuthentication portfolio （对比 ATECC608A-MAHTN-T)
- Shared-bus Single-Wire option across the family （对比 ATSHA204-MAH-DA-T)
- Trade-off: symmetric-only security model （对比 ATECC508A-MAHTN-T)
设计说明
Configuration-zone fusing is irreversible. Before locking, verify the IO interface selection (I2C for the MAHDA variant), I2C address, zone read/write permissions, and slot key usage. A misconfigured lock either bricks the device for your intended protocol or weakens key protection. Prototype with unlocked configuration first, then fuse only after host firmware passes end-to-end authentication on the production PCB.
Keep the I2C traces from host SDA/SCL to the ATSHA204A under 20 cm where possible and include 2.2k to 4.7k pull-up resistors sized for your bus capacitance. Connect the exposed pad to ground for thermal and mechanical stability on the 2x3 mm UDFN. Provide a 100 nF ceramic decoupling capacitor within 2 mm of the VCC pin, and route the authenticator away from switching-regulator nodes to keep the analog front end of the die quiet during hash operations.
Estimated: at a typical active current of 0.5 mA on a 3.3 V rail, an authentication burst consumes about 1.65 mW and lasts only milliseconds; in battery-powered consumables the dominant energy term is leakage in sleep, so ensure the host actually releases the bus so the device can enter its sleep state between transactions. Do not hold SDA/SCL asserted low after the transaction, as that can prevent sleep and drain coin cells measurably faster.
The device input thresholds depend on the VCC level in sleep and idle modes per the ATSHA204A datasheet electrical characteristics. On mixed-voltage boards (for example a 5 V-tolerant host talking to a 3.3 V authenticator), verify that host I2C drivers stay within the datasheet VIH/VIL window at your supply, or add level translation. Margin here is the most common cause of intermittent authentication failures on prototype boards.
合规信息
RoHS compliant and lead-free per Microchip's standard CryptoAuthentication portfolio offering; REACH, halogen-free, and conflict-minerals declarations not captured in sourced listings - verify on Microchip's compliance page.
