STMicroelectronics ST33HTPH2X32AHE4

Overview

ST33HTPH2X32AHE4 from STMicroelectronics is a Flash-memory-based Trusted Platform Module (TPM) 2.0 compliant with TCG Library Specification 2.0 Level 0 Rev 159 (errata 1.1) and PC Client Platform Specification 1.05 rev 14. It implements SPI interface up to 33 MHz, supports 1.8 V or 3.3 V supply, operates from −40 °C to 105 °C, and integrates FIPS SP800-90A/B- and AIS20/31-compliant DRBG/TRNG for cryptographic key generation (RSA 1024–3072, ECC NIST P-256/P-384), used in secure boot and platform attestation on industrial PCs and embedded controllers.

For engineers reviewing the ST33HTPH2X32AHE4 datasheet, ST33HTPH2X32AHE4 pinout, ST33HTPH2X32AHE4 application, or ST33HTPH2X32AHE4 equivalent, this page delivers verified TPM 2.0 functional compliance, SPI timing constraints (CPOL=0, CPHA=0), fault-tolerant firmware loader behavior, EAL4+ CC and FIPS 140-2 Level 2 certification status, and GPIO mapping for Physical Presence (GPIO_PP) and Low Power (GPIO_LP) control - all confirmed against DS14186 Rev 1.

Technical Context

The ST33HTPH2X32AHE4 implements a TCG-compliant SPI slave interface with fixed CPOL=0/CPHA=0 mode, 24-bit address decoding in the 0xD4_xxxx range, and active-low interrupt signaling via open-drain SPI_PIRQ. It supports both FIFO (legacy and extended) and CRB register access models per TCG PTP 2.0 r1.05.

Its security architecture includes active shield, environmental sensors (power monitoring), hardware/software fault injection protection, and dual random-number generators: deterministic (DRBG) compliant with FIPS SP800-90A/AIS20 and true (TRNG) compliant with FIPS SP800-90B/AIS31. Cryptographic acceleration covers RSA, ECC (NIST P-256/P-384/BN-256), AES-128/192/256, TDES, SHA-1/2/3, and HMAC.

Key Specifications

Pinout & Package

VFQFPN32 package (5 × 5 mm, 0.5 mm pitch), ECOPACK2-compliant, with exposed thermal pad (Pin 33, not internally connected).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar TPM 2.0 applications.

Compared with SLB9670 and NPCT750, the ST33HTPH2X32AHE4 uniquely combines extended temperature operation (−40 °C to +105 °C at 3.3 V), GPIO-controlled low-power mode, and dual-certified security (CC EAL4+, FIPS 140-2 Level 2), making it optimal for ruggedized industrial and automotive edge devices requiring long-term lifecycle assurance.

Availability

ST33HTPH2X32AHE4 is available at Aetrix Electronics and suitable for secure boot validation, platform attestation, firmware update authentication, and hardware-based key storage requiring stable component supply across industrial, automotive, and computing applications.

Supply support for ST33HTPH2X32AHE4 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing microcontrollers, analog ICs, MEMS, and secure elements for industrial, automotive, and consumer markets.

The STSAFE-TPM product line delivers certified, standards-compliant trusted platform modules focused on embedded and PC platforms requiring hardware-rooted security, cryptographic acceleration, and long-term certification maintenance.

FAQ

What is the maximum SPI clock frequency supported by ST33HTPH2X32AHE4?

The device supports SPI operation up to 33 MHz, as specified in the DS14186 Rev 1 datasheet. This frequency applies under standard load conditions with proper signal integrity; timing margins must be validated per Figure 7 (SPI slave timing diagram) where SPI_CLK must be low at SPI_CS falling edge.

Does ST33HTPH2X32AHE4 support both FIFO and CRB access modes?

Yes - it implements both legacy FIFO (offsets 0x0024–0x0027) and extended FIFO (offsets 0x0081–0x0083), as well as Command Response Buffer (CRB) registers (e.g., TPM_CRB_CTRL_REQ_x). The CRB interface is fully compliant with TCG PTP 2.0 r1.05 for locality-aware command execution.

How does the fault-tolerant firmware loader recover from interruption?

The loader uses redundant firmware sectors and atomic write sequencing to ensure partial writes do not corrupt operational code. Upon reset after interruption, the TPM automatically detects incomplete update state and restores from backup image - no host intervention or external recovery tool is required.

Is the VFQFPN32 package lead-free and RoHS compliant?

Yes - the VFQFPN32 package is ECOPACK2-compliant, meeting RoHS Directive 2011/65/EU and REACH Regulation (EC) No 1907/2006. The "ECOPACK" marking confirms halogen-free materials and lead-free terminations per JEDEC J-STD-020 moisture sensitivity level 3.