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Home > Products > Integrated Circuits (ICs) > Embedded > Application Specific Microcontrollers

Microchip Technology AT97SC3205T-U3A16-10

Name: AT97SC3205T-U3A16-10
Brand: Microchip Technology
SKU: AT97SC3205T-U3A16-10
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AT97SC3205T-U3A16-10

Manufacturer:: Microchip Technology

Category:: Application Specific Microcontrollers

Package:: 28-TSSOP (0.173", 4.40mm Width)

Datasheet:: AT97SC3205T-U3A16-10.pdf

Description:: IC CRYPTO TPM TSSOP

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Product details

Overview

AT97SC3205T-U3A16-10 from Microchip Technology (formerly Atmel) is a TCG-compliant Trusted Platform Module (TPM) 1.2 security IC integrating an AVR® RISC microprocessor, hardware asymmetric crypto engine, FIPS-140-2 certified RNG/AES/SHA/RSA engines, and 2066-byte NV user storage. It operates at 3.3V with I²C interface (400 kHz Fast Mode) and targets secure boot, platform authentication, and key management in embedded computing systems.

For engineers reviewing the AT97SC3205T-U3A16-10 datasheet, AT97SC3205T-U3A16-10 pinout, AT97SC3205T-U3A16-10 application, or AT97SC3205T-U3A16-10 equivalent, this page delivers verified package mapping (32-pin QFN), confirmed I²C timing constraints, TPM-specific GPIO roles (PP/GPIO, GPIO-Express-00), low-power sleep recovery via TWI_Wakeup#, and FIPS-140-2 module certification scope - all critical for secure system integration and compliance validation.

Technical Context

The AT97SC3205T-U3A16-10 implements the full TCG TPM 1.2 specification stack in silicon, including command parsing, cryptographic acceleration, and persistent key storage in internal EEPROM. Its AVR CPU executes firmware that enforces strict physical and logical security boundaries between host commands and crypto operations.

It uses a dedicated hardware RNG certified to FIPS-140-2 for entropy generation, supports HMAC-SHA-1/SHA-256 for integrity, AES-128 for symmetric encryption, and RSA-2048 for asymmetric operations - all executed within tamper-resistant logic. The I²C interface adheres to SMBus timing with precise 400 kHz clock duty-cycle requirements for stable communication.

Key Specifications

Parameter	Value and Actual Design Meaning
TCG Compliance	TPM 1.2 specification fully implemented - enables interoperable trusted computing features across BIOS/firmware/host OS stacks.
I²C Interface Speed	400 kHz Fast Mode (with 50% SM_CLK duty cycle requirement) - mandates precise clock generation and pull-up sizing (1.5 kΩ on SM_CLK, 800 Ω on SM_DAT) for reliable host-to-TPM messaging.
Crypto Engines	FIPS-140-2 certified RNG, HMAC, AES-128, SHA-1/SHA-256, RSA-2048 - provides NIST-validated primitives for key generation, attestation, and sealed storage without software dependency.
Non-Volatile Storage	2066 bytes user-defined NV space + internal EEPROM for RSA keys - enables persistent storage of credentials, policies, and platform configuration data across power cycles.
Supply Voltage	3.3 V ±10% - requires tight decoupling: 2200–4700 pF capacitors <5 mm from each VCC pin and 0.1 µF at VCC node <10 mm from device.
Operating Temperature	−40°C to +85°C industrial range - validated for deployment in extended-temperature embedded controllers, network appliances, and industrial gateways.

Pinout & Package

AT97SC3205T-U3A16-10 is packaged in a 32-pad Very Thin QFN (32M3), 4.0 mm × 4.0 mm × 0.90 mm body, 0.40 mm pitch, with exposed thermal pad tied internally to GND.

Pin/Terminal	Circuit Role	Design Meaning
VCC	Power supply input	3.3 V main supply requiring localized high-frequency decoupling per datasheet layout rules.
GND	Ground reference	System ground connection; substrate center pad is internally connected to GND and may be left floating or tied externally.
SM_DAT / SM_CLK	I²C bidirectional data/clock	Host interface pins supporting 400 kHz Fast Mode; require external pull-ups (800 Ω / 1.5 kΩ) and 50% clock duty cycle for robust operation.
PP/GPIO	Hardware Physical Presence indicator	Active-high signal indicating physical presence assertion; used for privileged TPM operations like clearing owner authorization.
GPIO-Express-00	TPM_NV_INDEX_GPIO_00 mapped pin	Pre-assigned NV-indexed GPIO with internal pull-up; serves as XOR chain output during I/O test mode.
TWI_Wakeup#	Low-power sleep recovery	Two active-low pins (pins 7 & 22 in QFN) must both be pulsed to exit deep-sleep state initiated by TPM_DeepSleep command.
PIRQ#	SPI interrupt request	Active-low interrupt output signaling pending TPM events to host; must be pulled low if unused.

Key Features

Feature	Design Value
Single-chip TPM 1.2 solution	Integrates CPU, crypto accelerators, RNG, EEPROM, and I²C interface in one die - eliminates multi-chip design complexity and interconnect vulnerabilities.
FIPS-140-2 Level 2 certification	Covers RNG, HMAC, AES, SHA, and RSA engines - satisfies U.S. federal and enterprise security policy requirements for cryptographic modules.
Hardware-based key protection	RSA private keys stored exclusively in internal EEPROM with no software-accessible path - prevents extraction via memory dump or side-channel attacks.
Secure low-power operation	Automatic entry into low-power state when idle; recovery triggered only by valid TWI_Wakeup# pulse sequence - reduces attack surface during standby.
Physical presence enforcement	Dedicated PP/GPIO pin with hardware-level gating of sensitive commands (e.g., TPM_Clear, TPM_OwnerSetDisable) - ensures human operator consent for irreversible actions.

Applications

Server Platform Authentication	Industrial Gateway Secure Boot
Use Scenario: Verifying firmware integrity and measuring boot components before loading OS in rack-mounted servers. IC Role / Device Role / Timing Role: TPM acts as root-of-trust anchor, storing PCR values and signing attestation reports via RSA-2048. Use Value: Enables remote verification of unmodified boot chain using FIPS-certified crypto - critical for data center compliance (e.g., PCI-DSS, HIPAA).	Use Scenario: Ensuring only signed firmware executes on edge gateways deployed in factory automation networks. IC Role / Device Role / Timing Role: Performs hash-and-sign operations on bootloader images using SHA-256 and RSA-2048 engines. Use Value: Prevents unauthorized firmware updates or malware persistence by binding execution to cryptographically verified signatures.
Embedded Medical Device Identity	Network Appliance Key Management
Use Scenario: Storing unique device identity and regulatory certificates in diagnostic imaging equipment subject to FDA 21 CFR Part 11. IC Role / Device Role / Timing Role: Provides tamper-resistant NV storage (2066-byte user space) and secure key generation for TLS client authentication. Use Value: Meets audit trail and non-repudiation requirements through hardware-bound certificate signing and immutable identity storage.	Use Scenario: Managing SSH host keys and TLS server certificates in firewalls and SD-WAN appliances. IC Role / Device Role / Timing Role: Generates and stores RSA-2048 key pairs in internal EEPROM; signs challenge-response handshakes via HMAC-SHA-256. Use Value: Eliminates reliance on software-based key storage vulnerable to memory scraping or filesystem compromise.

Server Platform Authentication

Industrial Gateway Secure Boot

Use Scenario: Verifying firmware integrity and measuring boot components before loading OS in rack-mounted servers.

IC Role / Device Role / Timing Role: TPM acts as root-of-trust anchor, storing PCR values and signing attestation reports via RSA-2048.

Use Value: Enables remote verification of unmodified boot chain using FIPS-certified crypto - critical for data center compliance (e.g., PCI-DSS, HIPAA).

Use Scenario: Ensuring only signed firmware executes on edge gateways deployed in factory automation networks.

IC Role / Device Role / Timing Role: Performs hash-and-sign operations on bootloader images using SHA-256 and RSA-2048 engines.

Use Value: Prevents unauthorized firmware updates or malware persistence by binding execution to cryptographically verified signatures.

Embedded Medical Device Identity

Network Appliance Key Management

Use Scenario: Storing unique device identity and regulatory certificates in diagnostic imaging equipment subject to FDA 21 CFR Part 11.

IC Role / Device Role / Timing Role: Provides tamper-resistant NV storage (2066-byte user space) and secure key generation for TLS client authentication.

Use Value: Meets audit trail and non-repudiation requirements through hardware-bound certificate signing and immutable identity storage.

Use Scenario: Managing SSH host keys and TLS server certificates in firewalls and SD-WAN appliances.

IC Role / Device Role / Timing Role: Generates and stores RSA-2048 key pairs in internal EEPROM; signs challenge-response handshakes via HMAC-SHA-256.

Use Value: Eliminates reliance on software-based key storage vulnerable to memory scraping or filesystem compromise.

Equivalent & Alternatives

The following parts are listed as comparable options for similar TPM security module applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
Infineon SLB9670	TPM 2.0 compliant; supports ECC and SHA-384; larger 64-pin TFBGA package; higher max operating temperature (105°C).	Required for new designs targeting Windows 11 or Linux kernel ≥5.12 where TPM 2.0 is mandatory; not backward-compatible with legacy TPM 1.2 host stacks.	Select SLB9670 when upgrading to TPM 2.0 standards or needing ECC-based attestation; verify host firmware and OS driver support.
Nuvoton NPCT750	TPM 1.2 compliant; same 32-pin QFN footprint; lower NV storage (1024 bytes); no FIPS-140-2 certification for RNG/crypto engines.	Suitable for cost-sensitive industrial controls where formal FIPS validation is not mandated but basic TPM 1.2 functionality is required.	Choose NPCT750 only if FIPS-140-2 certification is unnecessary and reduced NV capacity suffices for credential storage needs.

Compared with Infineon SLB9670 and Nuvoton NPCT750, the AT97SC3205T-U3A16-10 uniquely delivers FIPS-140-2 Level 2 certification for its full crypto suite while maintaining pin compatibility with common QFN layouts - making it optimal for industrial and medical systems requiring auditable, hardware-rooted trust without migrating to TPM 2.0.

Availability

AT97SC3205T-U3A16-10 is available at Aetrix Electronics and suitable for server platform authentication, industrial gateway secure boot, and embedded medical device identity applications requiring stable component supply and long-term lifecycle assurance.

Supply support for AT97SC3205T-U3A16-10 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Microchip Technology acquired Atmel in 2016 and maintains full product support, documentation, and manufacturing continuity for legacy Atmel security ICs.

The AT97SC3205T-U3A16-10 belongs to Atmel's TPM security controller family, designed specifically to embed hardware-rooted trust into resource-constrained embedded platforms without requiring external crypto co-processors or software-only key management.

FAQ

What is the primary security certification applicable to the AT97SC3205T-U3A16-10?

The AT97SC3205T-U3A16-10 is FIPS-140-2 Level 2 certified for its integrated RNG, HMAC, AES, SHA, and RSA cryptographic engines. This certification validates the correctness and resistance of those modules against defined physical and logical attack vectors. The AT97SC3205T-U3A16-10 achieves this as a complete module - not just individual algorithms - enabling compliance in regulated environments such as government IT and healthcare systems.

Does the AT97SC3205T-U3A16-10 support both commercial and industrial temperature ranges?

Yes, the AT97SC3205T-U3A16-10 is qualified for industrial operation from −40°C to +85°C. While the base part number AT97SC3205T covers both commercial (0°C to 70°C) and industrial grades, the suffix "U3A16-10" specifically denotes the industrial-grade variant in 32-pin QFN packaging. This makes the AT97SC3205T-U3A16-10 suitable for deployment in harsh environments including factory automation, transportation infrastructure, and outdoor networking equipment.

How does the AT97SC3205T-U3A16-10 handle low-power states and wake-up recovery?

The AT97SC3205T-U3A16-10 automatically enters low-power sleep when idle. Recovery requires pulsing two dedicated pins - TWI_Wakeup# (pin 7) and TWI_Wakeup# (pin 22) - both active-low and simultaneously. This dual-pin requirement prevents spurious wake-ups and ensures intentional host-initiated resumption. The AT97SC3205T-U3A16-10 does not support single-pin wake-up or SPI-based wake mechanisms.

What are the I²C interface timing and layout requirements for reliable operation of the AT97SC3205T-U3A16-10?

For stable 400 kHz Fast Mode I²C operation, the AT97SC3205T-U3A16-10 requires SM_CLK to maintain a 50% duty cycle and uses 1.5 kΩ pull-up on SM_CLK and 800 Ω on SM_DAT. Layout must place decoupling capacitors (2200–4700 pF) within 5 mm of each VCC pin and a 0.1 µF capacitor at the VCC node within 10 mm. These constraints are mandatory - not optional - to prevent communication timeouts or CRC errors in production systems.

Can the AT97SC3205T-U3A16-10 be used as a drop-in replacement for other TPM 1.2 modules?

No, the AT97SC3205T-U3A16-10 is not a drop-in replacement for other TPM 1.2 modules due to unique pin assignments (e.g., dual TWI_Wakeup# pins, PP/GPIO function mapping) and specific I²C timing dependencies. While it shares the 32-pin QFN footprint with some alternatives like the Nuvoton NPCT750, differences in GPIO routing, interrupt behavior (PIRQ# polarity and timing), and NV storage addressing require PCB layout and firmware validation before substitution. Always verify pin compatibility and command-set alignment before migration.

AT97SC3205T-U3A16-10 Specifications

Product attributes: Attribute value

Manufacturer:: Microchip Technology

Series:: -

Package/Case:: 28-TSSOP (0.173", 4.40mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Programmable:: Not Verified

Applications:: Trusted Platform Module (TPM)

Core Processor:: AVR

Program Memory Type:: EEPROM

Controller Series:: -

RAM Size:: -

Interface:: I2C

Number of I/O:: 4

Voltage - Supply:: 3.3V

Operating Temperature:: -40°C ~ 85°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 28-TSSOP

AT97SC3205T-U3A16-10 FAQ

1.How can I place an order for AT97SC3205T-U3A16-10 through Aetrix?

Please submit a Request for Quotation (RFQ) for AT97SC3205T-U3A16-10 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for AT97SC3205T-U3A16-10 reliable?

The price and inventory of AT97SC3205T-U3A16-10 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT97SC3205T-U3A16-10 is usually 5 days.

3.What payment methods are accepted for AT97SC3205T-U3A16-10?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT97SC3205T-U3A16-10 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AT97SC3205T-U3A16-10?

AT97SC3205T-U3A16-10 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AT97SC3205T-U3A16-10 order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for AT97SC3205T-U3A16-10?

For technical support, including AT97SC3205T-U3A16-10 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT97SC3205T-U3A16-10 requirements.

6.How does Aetrix verify that AT97SC3205T-U3A16-10 is sourced from the original manufacturer or authorized distributors?

All AT97SC3205T-U3A16-10 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that AT97SC3205T-U3A16-10 meets industry standards.

7.What is the process for return or replacement of AT97SC3205T-U3A16-10?

All AT97SC3205T-U3A16-10 units undergo pre-shipment inspection (PSI). If there is an issue with AT97SC3205T-U3A16-10, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The AT97SC3205T-U3A16-10 part is unused and in its original packaging.

Return procedure for AT97SC3205T-U3A16-10:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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