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Microchip Technology ATSHA204-TH-CZ-T
- Part No.:
- ATSHA204-TH-CZ-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
- Payment:
- Shipping:
Product Details
ATSHA204-TH-CZ-T - Single-Wire Authentication IC
Microchip Technology ATSHA204-TH-CZ-T is an SHA-256 hardware authentication device supplied in an 8-lead, 4.4 mm-body TSSOP tape-and-reel package with the single-wire interface configuration.
The exact ordering option, electrical ratings, pinout and functions were checked against the manufacturer's ATSHA204 datasheet.
Overview
The ATSHA204 CryptoAuthentication device performs challenge-response validation using SHA-256-based MAC and HMAC operations. It combines hardware-protected keys, a unique serial number and a random-number generator. The -TH-CZ-T ordering suffix specifies TSSOP packaging and single-wire signaling; it must not be confused with the -TH-DA-T I2C option.
Key Advantages
Challenge-response security
MAC and HMAC commands produce a 256-bit digest derived from a challenge and protected key.
Unique identity
A guaranteed-unique 72-bit serial number supports device-specific authentication schemes.
Flexible key storage
Sixteen 32-byte data slots can be configured for keys or protected data.
Low-pin-count interface
The exact -CZ option uses single-wire communication on SDA rather than the I2C configuration.
Feature Summary
Cryptographic commands
SHA-256 MAC, HMAC, nonce and key-derivation operations support layered authentication designs.
Memory zones
512-byte data zone, 88-byte configuration zone and 64-byte OTP zone are described in the datasheet.
Power management
Sleep and idle modes allow the host to reduce consumption between transactions.
Lifecycle caution
The manufacturer's datasheet marks ATSHA204 not recommended for new designs and names ATSHA204A as a successor; migration still requires a full compatibility review.
Package & Footprint
ATSHA204-TH-CZ-T is the manufacturer's 8-lead TSSOP tape-and-reel order code. The 4.4 mm body drawing and pin-one orientation must be used for PCB layout. LCDChip's package register uses the canonical name 8-TSSOP.
- Match the manufacturer's TSSOP drawing and lead pitch to the land pattern.
- Verify pin 1 orientation and connect VCC and GND as shown in the pinout.
- Design the SDA pull-up and host I/O levels for the single-wire configuration.
The registered 8-TSSOP JPG is not yet present locally. Its expected path is retained; publication must wait for image verification.
Pin Functions
The manufacturer's eight-lead TSSOP top-view pin diagram shows the physical assignments below. The -CZ interface designation is single-wire, so the host should follow the single-wire wiring section rather than an I2C schematic.
Power-supply input.
Ground reference.
Serial data connection used by the single-wire interface.
Clock pin shown in the family pinout; do not assume it is used by the -CZ single-wire interface.
No-connect positions in the manufacturer's TSSOP pinout.
Confirm unused-pin treatment and electrical wiring against the manufacturer's exact-interface guidance before board release.
Key Specifications
| Parameter | Manufacturer specification |
|---|---|
| Authentication engine | SHA-256 MAC and HMAC options |
| Key length | 256 bits |
| Data-zone organization | 16 slots × 32 bytes |
| Configuration zone | 88 bytes |
| OTP zone | 64 bytes |
| Unique serial number | 72 bits |
| Supply-voltage range | 2.0–5.5 V |
| Ambient operating temperature | −40 to +85 °C |
| Sleep current | 30 nA typical; 150 nA maximum at VCC ≤ 3.6 V and TA ≤ 55 °C under stated input conditions |
| Interface for -CZ option | Single-wire |
| Package | 8-lead, 4.4 mm-body TSSOP; tape and reel |
Typical and maximum values are identified separately where applicable. Consult the complete manufacturer electrical tables for loading, timing and conditions at the selected supply and temperature.
Replacement Considerations
The manufacturer names ATSHA204A as a successor for new designs. Do not infer drop-in compatibility: compare the complete ordering suffix, package drawing, host protocol, command behavior, key provisioning and electrical limits. The ATSHA204-TH-DA-T option uses I2C rather than the -CZ single-wire configuration and cannot be substituted without host-interface review. No alternate model is linked without an exact internal catalog match and engineering approval.
Manufacturer Information
Microchip Technology maintains the legacy Atmel ATSHA204 documentation. The manufacturer's ordering table identifies ATSHA204-TH-CZ-T as the single-wire, eight-lead TSSOP tape-and-reel configuration. The controlled datasheet marks the device not recommended for new designs.
Applications
Accessory authentication
Challenge-response validation of replaceable modules or consumables.
Firmware validation
Hardware-backed authentication in a secure-boot or anti-piracy design.
Protected credentials
Storage of application keys and small protected data records.
Legacy design support
Maintenance of an existing single-wire ATSHA204 implementation with its established provisioning flow.
Quality & Authenticity
Check the complete purchasing order code and traceable shipment documentation. The manufacturer notes that the ordering code is not printed on the package; a changing lot mark is not enough to identify the exact interface option. Production acceptance should include the intended cryptographic challenge-response test without exposing secret keys.
FAQ
Which interface does -TH-CZ-T use?
The manufacturer's exact ordering table specifies single-wire operation.
Is -TH-DA-T the same interface?
No. The -DA option is listed with I2C and requires a different host-interface review.
Can the package mark establish the order code?
No. The manufacturer says the ordering code does not appear on the package.
Is ATSHA204 recommended for a new design?
No. The manufacturer's datasheet marks it not recommended for new designs and points to ATSHA204A.
Engineering Notice
Review the controlled datasheet, errata, package drawing and current lifecycle before production use. Keep the I/O driver, VCC and SDA pull-up on compatible rails as required by the manufacturer's latch-up guidance. This draft cannot be published until the package JPG and rendered product page are verified.
ATSHA204-TH-CZ-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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