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Microchip Technology ATSHA204-TH-DA-T
- Part No.:
- ATSHA204-TH-DA-T
- Manufacturer:
- Microchip Technology
- Category:
- Specialized ICs
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Description:
- IC AUTHENTICATION CHIP 8TSSOP
- Quantity:
Unit Price:$0
Ext Price:$0
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- Shipping:
Product Details
ATSHA204-TH-DA-T - I2C Secure Authentication IC
Microchip Technology ATSHA204-TH-DA-T is a SHA-256-based hardware authentication device with protected key storage. This exact ordering option uses I2C and an 8-lead TSSOP package with a nominal 4.40 mm body width, supplied on tape and reel.
The manufacturer marks the original ATSHA204 not recommended for new designs and identifies ATSHA204A as its successor. Verify lifecycle and provisioning requirements before design-in.
Overview
ATSHA204-TH-DA-T supports host and client authentication using SHA-256 message authentication functions and protected on-chip keys. It can help a system validate accessories, firmware, or network nodes without exposing a secret key directly on the host interface. The TH-DA-T ordering suffix denotes the 8-lead TSSOP I2C tape-and-reel option; the TH-CZ-T ordering option uses single-wire signaling instead.
Key Advantages
Protected secrets
On-chip key storage and configurable access policies help reduce exposure of authentication keys.
SHA-256 authentication
MAC and HMAC functions support challenge-response designs for validating connected devices.
I2C host connection
The exact DA ordering variant uses SDA and SCL and supports an I2C interface specified up to 1 MHz.
Low-duty-cycle operation
The manufacturer lists sleep current below 150 nA for the device family.
Feature Summary
Key and data memory
4.5 Kb EEPROM accommodates keys and data, with storage for up to 16 keys.
Device identity
A unique 72-bit serial number can be used within authenticated identity protocols.
One-time data
512 OTP bits are provided for fixed information, subject to the configured access rules.
Random challenge support
An internal random-number generator supports cryptographic challenge workflows.
Package & Footprint
The manufacturer's exact ordering table lists ATSHA204-TH-DA-T as an 8-lead TSSOP. Its TSSOP drawing specifies a 4.40 mm nominal body width, matching the original catalog description 8-TSSOP (0.173", 4.40mm Width). The normalized package-register name is 8-TSSOP.
- Use the manufacturer's 8-lead TSSOP drawing for pad dimensions and tolerances.
- Observe the pin-one indicator and top-view signal assignment.
- Check SDA/SCL pull-ups, VCC decoupling, and I/O voltage limits.
The registered package JPG is awaiting upload to the production site; it may not display yet.
Pin Functions
The manufacturer's 8-lead TSSOP pinout gives the following top-view assignments:
No-connect pins.
Ground reference.
I2C serial data.
I2C serial clock input.
Device supply.
Use the manufacturer drawing for physical orientation; the package illustration is not a substitute for the pinout.
Key Specifications
| Function | SHA-256 secure authentication device |
|---|---|
| Exact-order interface | I2C (TH-DA-T variant) |
| I2C speed | Up to 1 MHz, per manufacturer datasheet |
| Supply voltage | 2.0 to 5.5 V operating range |
| Communications voltage | 1.8 to 5.5 V, subject to interface conditions |
| Sleep current | Less than 150 nA, manufacturer family claim |
| EEPROM | 4.5 Kb for keys and data |
| Key storage | Up to 16 keys, with 256-bit key length |
| OTP memory | 512 bits |
| Serial number | Unique 72-bit identifier |
| Package | 8-lead TSSOP; 4.40 mm nominal body width |
| Delivery form | Tape and reel |
Operating conditions must not be confused with absolute-maximum ratings. Check the latest controlled datasheet and errata for final limits.
Replacement Considerations
The manufacturer names ATSHA204A as the successor family. Select its exact 8-lead TSSOP I2C ordering option only after confirming the current manufacturer order code, key personalization, configuration, firmware commands, electrical limits, package drawing, and availability. Do not treat the family relationship as unconditional pin- or software-level interchangeability.
ATSHA204-TH-CZ-T is a single-wire option and is not an interface-equivalent replacement for the I2C DA variant. No LCDChip internal product link is asserted without an exact production-API match.
Manufacturer Information
ATSHA204 originated in Atmel's CryptoAuthentication family and is documented by Microchip Technology. The original manufacturer datasheet marks ATSHA204 not recommended for new designs and points to ATSHA204A. Check current lifecycle information when planning a new product.
Applications
Accessory validation
Challenge-response checks can help identify authorized replaceable modules or consumables.
Firmware integrity
Use hardware-backed authentication as one element of a secure-boot design.
Protected key storage
Store device credentials in the IC rather than exposing them in general-purpose host memory.
Control-network authentication
Verify a device identity before permitting sensitive control operations.
Quality & Authenticity
Verify the exact order code through procurement and traceability records. The manufacturer's datasheet notes that the order code is not printed on the package, so lot markings alone should not be used to identify this variant. System authenticity depends on correct device provisioning and host-side verification.
FAQ
Does this exact option use I2C?
Yes. The manufacturer's ordering table assigns I2C to ATSHA204-TH-DA-T; the TH-CZ-T option uses single-wire signaling.
Which pins carry SDA and SCL?
In the 8-lead TSSOP top-view pinout, SDA is pin 5 and SCL is pin 6.
Is ATSHA204A an automatic substitute?
No. Review the exact ordering code, personalization, host firmware, electrical limits, and package before substitution.
Engineering Notice
Confirm the manufacturer datasheet and errata, especially I/O voltage limits, before PCB and security-configuration release. The production package illustration is currently unavailable. This page does not state real-time inventory or pricing.
ATSHA204-TH-DA-T Information
- Specifications
- Tags
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- CryptoAuthentication™
- Package/Case:
- 8-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Authentication Chip
- Applications:
- Networking and Communications
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-TSSOP
- Grade:
- -
- Qualification:
- -
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