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Microchip Technology AT97SC3205T-H3M4B00B
- Part No.:
- AT97SC3205T-H3M4B00B
- Manufacturer:
- Microchip Technology
- Category:
- Application Specific Microcontrollers
- Package:
- 32-VFQFN Exposed Pad
- Datasheet:
-
AT97SC3205T-H3M4B00B.pdf
- Description:
- PROD STD IND I2C TPM 4X4 32VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,525
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Product details
Overview
AT97SC3205T-H3M4B00B from Microchip (acquired Atmel) is a TCG-compliant Trusted Platform Module (TPM) 1.2 security IC integrating an AVR® RISC microprocessor, hardware RSA crypto engine, FIPS-140-2 certified RNG, HMAC/AES/SHA engines, and 2066-byte NV user storage. It operates at 3.3V with I²C interface up to 400 kHz and targets secure boot, platform authentication, and key attestation in embedded computing systems.
For engineers reviewing the AT97SC3205T-H3M4B00B datasheet, AT97SC3205T-H3M4B00B pinout, AT97SC3205T-H3M4B00B application, or AT97SC3205T-H3M4B00B equivalent, this page delivers verified electrical specs, validated pin functions, confirmed TPM 1.2 compliance, industrial temperature range (-40°C to +85°C), and real-world design guidance for secure firmware integration and low-power sleep recovery.
Technical Context
The AT97SC3205T-H3M4B00B implements the full TCG TPM 1.2 specification stack in silicon, including command parsing, cryptographic acceleration, and secure non-volatile key storage. Its internal AVR CPU executes firmware that enforces strict access control policies and isolates sensitive operations from host software.
It supports both Standard Mode (100 kHz) and Fast Mode (400 kHz) I²C communication with configurable pull-up recommendations (800 Ω on SM_DAT, 1.5 kΩ on SM_CLK) and includes dedicated hardware for physical presence assertion (PP/GPIO), tamper detection (XTAMPER via TestBI/GPIO), and low-power deep-sleep wake-up (TWI_Wakeup# dual-pin sequence).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| TCG Compliance | Full TPM 1.2 specification implementation - enables interoperable trusted boot and remote attestation across Windows/Linux platforms. |
| Crypto Engine | Hardware-accelerated RSA, SHA-1, HMAC-SHA1, AES-128 - offloads computationally intensive signing/verification from host CPU. |
| RNG Certification | FIPS-140-2 certified random number generator - meets NIST SP 800-90A requirements for key generation and protocol randomness. |
| I²C Interface | 400 kHz Fast Mode / 100 kHz Standard Mode - supports high-throughput command/response cycles with precise timing and duty-cycle sensitivity. |
| Supply Voltage | 3.3 V ±10% - requires tight decoupling (2200–4700 pF near each VCC pin, 0.1 µF shared node) for stable operation over full temperature range. |
| Temperature Range | -40°C to +85°C industrial grade - qualified for deployment in ruggedized industrial controllers and network infrastructure equipment. |
| NV Storage | 2066 bytes user-defined data space - persistent storage for certificates, policy hashes, or custom secrets without host OS dependency. |
Pinout & Package
AT97SC3205T-H3M4B00B is available in two RoHS-compliant packages: 28-pin Thin TSSOP (4.4 mm × 9.7 mm, 0.65 mm pitch) and 32-pad QFN (4.0 mm × 4.0 mm, 0.40 mm pitch). The H3M4B00B ordering code corresponds to the 32-pad QFN variant with industrial temperature range and lead-free finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Power supply input | 3.3 V main supply requiring localized decoupling (2200–4700 pF) and shared 0.1 µF bypass within 10 mm. |
| GND | Ground reference | System ground return; QFN center pad internally tied to GND - may be left floating or connected externally. |
| SM_DAT | I²C bidirectional data line | Open-drain I²C data; requires external 800 Ω pull-up for reliable 400 kHz operation; noise-sensitive interface. |
| SM_CLK | I²C clock input | Requires external 1.5 kΩ pull-up and ~50% duty cycle for stable high-speed communication. |
| PP/GPIO | Physical Presence indicator | Active-high hardware signal asserting user-initiated secure operations; internal pull-down - leave floating if unused. |
| TWI_Wakeup# | Low-power wake trigger | Dual-pin active-low sequence required to exit TPM_DeepSleep mode - must pulse both pins simultaneously. |
| PIRQ# | Interrupt request output | Open-drain interrupt signal indicating pending TPM response or event - tie to GND via 4.7 kΩ if unused. |
| GPIO-Express-00 | Pre-mapped NV GPIO | Directly maps to TPM_NV_INDEX_GPIO_00; internal pull-up - leave floating when not used as persistent GPIO. |
Key Features
| Feature | Design Value |
|---|---|
| Single-chip TPM 1.2 solution | Integrates CPU, crypto engines, RNG, EEPROM, and I²C interface - eliminates multi-chip design complexity and board area overhead. |
| FIPS-140-2 certified subsystems | Certified RNG, HMAC, AES, SHA, and RSA engines - satisfies regulatory requirements for government and enterprise deployments. |
| Hardware Physical Presence support | Dedicated PP/GPIO pin with defined behavior per TCG spec - enables secure BIOS-level configuration changes only upon physical user confirmation. |
| Deep-sleep power management | Automatic entry into low-power state during idle; recovery requires dual-pin TWI_Wakeup# pulse - reduces system standby current. |
| Secure key lifecycle handling | Internal EEPROM stores RSA keys with hardware-enforced access controls - prevents extraction or modification by host software. |
Applications
| Server Platform Integrity | Industrial Control Authentication |
|---|---|
Use Scenario: Secure boot chain verification and runtime measurement logging in x86/ARM servers. IC Role / Device Role / Timing Role: TPM 1.2 root-of-trust enforcing PCR extension, sealed storage, and remote attestation responses. Use Value: Enables BitLocker, Shielded VMs, and Intel TXT compatibility with hardware-backed key protection and immutable log storage. | Use Scenario: Firmware update authorization and device identity binding in PLCs and HMIs operating in harsh environments. IC Role / Device Role / Timing Role: Secure credential store and cryptographic signature verifier for signed firmware images. Use Value: Prevents unauthorized firmware injection using hardware-verified signatures and tamper-resistant key storage. |
| Network Equipment Trust Anchor | Medical Device Data Integrity |
Use Scenario: Certificate-based mutual TLS authentication and secure key exchange in edge routers and firewalls. IC Role / Device Role / Timing Role: Hardware-secured private key storage and TLS handshake acceleration via RSA/HMAC engines. Use Value: Eliminates software-only key exposure risks while maintaining sub-100 ms latency for encrypted session establishment. | Use Scenario: HIPAA-compliant audit log sealing and patient data encryption key management in diagnostic imaging systems. IC Role / Device Role / Timing Role: FIPS-140-2 certified RNG and AES-128 engine generating and protecting encryption keys for DICOM files. Use Value: Meets FDA cybersecurity guidance for cryptographic module validation and persistent, unalterable integrity logs. |
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 SHA-256, ECC, and PCR banks beyond TPM 1.2 scope; different I²C address and command set. | Required for new designs targeting Windows 11 or Linux kernel ≥5.10 with native TPM 2.0 drivers; not backward-compatible with legacy TPM 1.2 stacks. | Select SLB9670 only when upgrading to TPM 2.0 mandates; AT97SC3205T-H3M4B00B remains optimal for existing TPM 1.2 infrastructure. |
| Nuvoton NPCT750 | TPM 1.2 compliant; identical I²C interface and command structure; smaller 5×5 mm QFN package; lower max junction temperature (105°C vs. 125°C). | Drop-in replacement for space-constrained designs where thermal margin is sufficient; same firmware integration effort. | NPCT750 offers footprint reduction but lacks extended industrial temp rating; verify thermal derating in target enclosure before substitution. |
Compared with Infineon SLB9670 and Nuvoton NPCT750, the AT97SC3205T-H3M4B00B provides validated TPM 1.2 interoperability with legacy BIOS/UEFI and OS stacks, industrial-grade thermal resilience, and integrated physical presence signaling - making it the preferred choice for long-lifecycle embedded systems requiring field-proven stability over cutting-edge crypto extensions.
Availability
AT97SC3205T-H3M4B00B is available at Aetrix Electronics and suitable for server platform integrity, industrial control authentication, and network equipment trust anchor applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for AT97SC3205T-H3M4B00B 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 the AT97SC3205T family.
The AT97SC3205T belongs to Atmel's Trusted Platform Module product line, designed specifically to deliver certified, single-chip TPM 1.2 functionality for embedded systems requiring hardware-rooted security without external co-processors or discrete crypto ICs.
FAQ
What is the primary compliance standard met by the AT97SC3205T-H3M4B00B?
The AT97SC3205T-H3M4B00B is fully compliant with the Trusted Computing Group (TCG) Trusted Platform Module (TPM) Version 1.2 Specification. It implements all mandatory commands, data structures, and security policies defined in Parts 1–3 of the TCG TPM Main Specification, enabling interoperable trusted boot, remote attestation, and sealed storage across Windows, Linux, and UEFI platforms. This compliance is verified through functional testing against the official TCG test suite.
Does the AT97SC3205T-H3M4B00B support both commercial and industrial temperature ranges?
Yes, the AT97SC3205T-H3M4B00B is qualified for industrial operation from -40°C to +85°C. The "H3M4B00B" suffix explicitly denotes the industrial temperature grade in the 32-pad QFN package. While the base AT97SC3205T part number is offered in both commercial (0°C to 70°C) and industrial variants, this specific ordering code guarantees full performance and reliability across the extended industrial range, including validated I²C timing margins and EEPROM retention.
How does the AT97SC3205T-H3M4B00B handle low-power states?
The AT97SC3205T-H3M4B00B automatically enters a low-power sleep state when idle, requiring no host intervention. To recover, the host must assert the TWI_Wakeup# signal on two dedicated pins (TSSOP pin 7 & 22 or QFN pin 7 & 22) with simultaneous active-low pulses. This dual-pin requirement prevents spurious wake-ups and ensures intentional resumption of secure operations - a design feature confirmed in the Atmel-specific TPM_DeepSleep command implementation.
What cryptographic algorithms are hardware-accelerated in the AT97SC3205T-H3M4B00B?
The AT97SC3205T-H3M4B00B integrates dedicated hardware engines for RSA key generation and signing/verification (up to 2048-bit), SHA-1 hashing, HMAC-SHA1 message authentication, and AES-128 encryption/decryption. These accelerators operate independently of the onboard AVR® RISC CPU, enabling concurrent cryptographic processing and deterministic execution times - critical for meeting TCG timing requirements and resisting side-channel timing attacks.
Can the AT97SC3205T-H3M4B00B be used as a direct replacement for other TPM 1.2 modules?
The AT97SC3205T-H3M4B00B is not guaranteed as a pin-compatible or drop-in replacement for other TPM 1.2 modules due to unique pin assignments (e.g., dual TWI_Wakeup# pins, PP/GPIO physical presence signaling) and package-specific layout requirements. While functionally equivalent in TPM 1.2 protocol behavior, PCB layout, decoupling, and I²C pull-up sizing must be validated per the AT97SC3205T-H3M4B00B datasheet - especially for the 32-pad QFN variant's thermal pad and signal routing constraints.
AT97SC3205T-H3M4B00B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 32-VFQFN Exposed Pad
- Packaging:
- Tray
- Product Status:
- Discontinued at Digi-Key
- 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:
- 32-VQFN (4x4)
AT97SC3205T-H3M4B00B FAQ
1.How can I place an order for AT97SC3205T-H3M4B00B through Aetrix?
Please submit a Request for Quotation (RFQ) for AT97SC3205T-H3M4B00B 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-H3M4B00B reliable?
The price and inventory of AT97SC3205T-H3M4B00B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT97SC3205T-H3M4B00B is usually 5 days.
3.What payment methods are accepted for AT97SC3205T-H3M4B00B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT97SC3205T-H3M4B00B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT97SC3205T-H3M4B00B?
AT97SC3205T-H3M4B00B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT97SC3205T-H3M4B00B 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-H3M4B00B?
For technical support, including AT97SC3205T-H3M4B00B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT97SC3205T-H3M4B00B requirements.
6.How does Aetrix verify that AT97SC3205T-H3M4B00B is sourced from the original manufacturer or authorized distributors?
All AT97SC3205T-H3M4B00B 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-H3M4B00B meets industry standards.
7.What is the process for return or replacement of AT97SC3205T-H3M4B00B?
All AT97SC3205T-H3M4B00B units undergo pre-shipment inspection (PSI). If there is an issue with AT97SC3205T-H3M4B00B, 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-H3M4B00B part is unused and in its original packaging.
Return procedure for AT97SC3205T-H3M4B00B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT97SC3205T-H3M4B00B Tags
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