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Home > Products > Integrated Circuits (ICs) > Memory > Memory

Microchip Technology SST25VF512A-33-4I-QAE-T

Name: SST25VF512A-33-4I-QAE-T
Brand: Microchip Technology
SKU: SST25VF512A-33-4I-QAE-T
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SST25VF512A-33-4I-QAE-T

Manufacturer:: Microchip Technology

Category:: Memory

Package:: 8-WDFN Exposed Pad

Datasheet:: SST25VF512A-33-4I-QAE-T.pdf

Description:: IC FLASH 512KBIT SPI 33MHZ 8WSON

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Product details

Overview

SST25VF512A-33-4I-QAE-T from Microchip Technology is a 512 Kbit SPI serial flash memory IC with SuperFlash technology, supporting 33 MHz high-speed read, 2.7–3.6 V single-supply operation, and industrial temperature range (–40°C to +85°C). It features uniform 4 KByte sectors and 32 KByte overlay blocks, enabling flexible firmware storage in microcontroller boot loaders and embedded systems.

For engineers reviewing the SST25VF512A-33-4I-QAE-T datasheet, SST25VF512A-33-4I-QAE-T pinout, SST25VF512A-33-4I-QAE-T application, or SST25VF512A-33-4I-QAE-T equivalent, key selection criteria include SPI Mode 0/3 compatibility, hardware HOLD#/WP# control, AAI programming efficiency, and industrial-grade reliability for long-life embedded deployments.

Technical Context

The SST25VF512A-33-4I-QAE-T implements a four-wire SPI interface (SCK, SI, SO, CE#) with dual-mode clock polarity support (Mode 0 and Mode 3), enabling interoperability with diverse host controllers. Its SuperFlash split-gate cell architecture delivers 100,000 program/erase cycles and >100 years data retention - exceeding standard NOR flash endurance.

It integrates dedicated control pins (HOLD# for suspend/resume of ongoing transfers and WP# for status register lock-down), plus software-managed block protection (BP1/BP0) and Auto Address Increment (AAI) for accelerated sequential byte programming without address retransmission.

Key Specifications

Parameter	Value and Actual Design Meaning
Memory Density	512 Kbit (64 KByte), organized as 16 × 4 KByte sectors or 2 × 32 KByte overlay blocks - supports modular firmware updates and parameter partitioning.
Max Clock Frequency	33 MHz for High-Speed Read mode - enables fast code execution from XIP (execute-in-place) configurations in resource-constrained MCUs.
Supply Voltage	2.7–3.6 V single supply - compatible with 3.3 V logic domains and eliminates need for level shifters in most embedded designs.
Endurance & Retention	100,000 program/erase cycles typical; >100 years data retention - suitable for field-upgradable devices requiring multi-decade service life.
Active/Standby Current	7 mA typical active read current; 8 µA typical standby current - reduces power budget impact in battery-backed or low-power IoT nodes.
Operating Temperature	–40°C to +85°C (Industrial grade) - validated for deployment in automotive body control modules and industrial PLCs.
Erase/Program Speed	18 ms sector/block erase; 14 µs byte-program; 70 ms chip-erase - enables rapid firmware recovery and over-the-air update staging.

Pinout & Package

Package: 8-lead SOIC (150 mil body width), RoHS-compliant, lead-free.

Pin/Terminal	Circuit Role	Design Meaning
CE#	Chip Enable	Active-low device select; must remain low throughout command sequence - enables daisy-chaining multiple SPI slaves on shared bus.
SCK	Serial Clock	Timing reference for all SPI transfers; supports Mode 0 (idle low) and Mode 3 (idle high) - ensures compatibility with ARM Cortex-M, PIC, and FPGA SPI masters.
SI	Serial Data Input	Command/address/data input path; latched on SCK rising edge - used for WREN, Sector-Erase, Byte-Program, and status register writes.
SO	Serial Data Output	Data/command output path; shifted out on SCK falling edge - delivers read data, status register contents, and manufacturer/device IDs.
WP#	Write Protect	Hardware enable for status register lock-down (BPL bit); when low, prevents accidental modification of BP1/BP0 protection bits - critical for secure boot integrity.
HOLD#	Hold	Suspends ongoing SPI transfer without deselecting device or resetting internal state - allows host to service higher-priority interrupts mid-read/write.
VDD	Power Supply	2.7–3.6 V supply input - decoupling capacitor required per datasheet layout guidelines to maintain signal integrity at 33 MHz.
VSS	Ground	Reference ground for all I/O and core logic - must be connected to system ground plane with low-inductance path.

Key Features

Feature	Design Value
SuperFlash Technology	Split-gate cell with thick-oxide tunneling injector enables lower program current and faster erase vs. conventional NOR - reduces total energy per operation by ~40%.
Auto Address Increment (AAI)	Eliminates repeated 24-bit address transmission during sequential byte programming - cuts programming time by up to 65% compared to standard Byte-Program mode.
Dual SPI Mode Support	Native compatibility with both SPI Mode 0 (CPOL=0, CPHA=0) and Mode 3 (CPOL=1, CPHA=1) - avoids software workarounds or hardware level-shifting in mixed-controller environments.
Flexible Block Protection	Software-configurable BP1/BP0 bits allow selective write-protection of 0%, 25%, 50%, or 100% of memory array - supports secure bootloader + user-application partitioning.
HOLD# and WP# Pins	Dedicated hardware controls enable real-time transaction suspension and irreversible status register lockdown - essential for deterministic timing in safety-critical firmware updates.

Applications

MCU Boot Code Storage	Firmware Update Buffer
Use Scenario: Stores primary bootloader and initial firmware image for ARM Cortex-M4-based motor control drives operating in harsh industrial environments. IC Role / Device Role / Timing Role: Non-volatile code storage accessed via SPI XIP during cold start; supports fast 33 MHz reads to minimize boot latency. Use Value: Industrial temperature rating and 100K-cycle endurance ensure reliable operation across 15+ years of continuous runtime with periodic field updates.	Use Scenario: Holds staged firmware images for OTA updates in smart metering gateways with dual-bank update architecture. IC Role / Device Role / Timing Role: Secondary storage bank isolated from active runtime code; erased/programmed using AAI and sector-erase commands during maintenance windows. Use Value: Uniform 4 KByte sectors enable atomic update rollback; HOLD# pin allows safe interruption of large writes during power-loss events.
Configuration Parameter Storage	Secure Key Vault
Use Scenario: Retains calibration coefficients and sensor compensation tables in medical diagnostic equipment requiring FDA audit trails. IC Role / Device Role / Timing Role: Persistent parameter storage accessed infrequently via SPI read/write; protected via BP0/BP1 bits against accidental overwrite. Use Value: >100-year data retention guarantees parameter integrity across product lifecycle without battery backup or refresh routines.	Use Scenario: Stores cryptographic keys and root-of-trust certificates in industrial HMI panels with tamper-resistant firmware signing. IC Role / Device Role / Timing Role: Write-protected memory region locked via WP# and BPL bit; accessible only after authenticated host handshake. Use Value: Hardware-enforced write lockdown prevents unauthorized key modification - satisfies IEC 62443-3-3 SL2 requirements for secure element co-location.

MCU Boot Code Storage

Firmware Update Buffer

Use Scenario: Stores primary bootloader and initial firmware image for ARM Cortex-M4-based motor control drives operating in harsh industrial environments.

IC Role / Device Role / Timing Role: Non-volatile code storage accessed via SPI XIP during cold start; supports fast 33 MHz reads to minimize boot latency.

Use Value: Industrial temperature rating and 100K-cycle endurance ensure reliable operation across 15+ years of continuous runtime with periodic field updates.

Use Scenario: Holds staged firmware images for OTA updates in smart metering gateways with dual-bank update architecture.

IC Role / Device Role / Timing Role: Secondary storage bank isolated from active runtime code; erased/programmed using AAI and sector-erase commands during maintenance windows.

Use Value: Uniform 4 KByte sectors enable atomic update rollback; HOLD# pin allows safe interruption of large writes during power-loss events.

Configuration Parameter Storage

Secure Key Vault

Use Scenario: Retains calibration coefficients and sensor compensation tables in medical diagnostic equipment requiring FDA audit trails.

IC Role / Device Role / Timing Role: Persistent parameter storage accessed infrequently via SPI read/write; protected via BP0/BP1 bits against accidental overwrite.

Use Value: >100-year data retention guarantees parameter integrity across product lifecycle without battery backup or refresh routines.

Use Scenario: Stores cryptographic keys and root-of-trust certificates in industrial HMI panels with tamper-resistant firmware signing.

IC Role / Device Role / Timing Role: Write-protected memory region locked via WP# and BPL bit; accessible only after authenticated host handshake.

Use Value: Hardware-enforced write lockdown prevents unauthorized key modification - satisfies IEC 62443-3-3 SL2 requirements for secure element co-location.

Equivalent & Alternatives

The following parts are listed as comparable options for similar SPI serial flash applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
Winbond W25Q80DVSSIG	8 Mbit density, 104 MHz max clock, Quad SPI support - no HOLD#/WP# pin-level compatibility; different status register map.	Higher bandwidth for graphics or audio buffering; not drop-in for SST25VF512A-33-4I-QAE-T's 512 Kbit footprint or timing-critical HOLD# use cases.	Select only if migrating to quad-SPI interface and requiring >512 Kbit capacity; requires PCB and firmware revision.
Macronix MX25L512CM1D	512 Kbit, 33 MHz, same SOIC-8 package and pinout; supports SPI Mode 0 only - lacks Mode 3 compatibility and AAI programming.	Drop-in replacement for basic read/write functions but cannot replicate HOLD#-based interrupt handling or AAI-accelerated programming sequences.	Acceptable for cost-sensitive designs where Mode 3 interoperability and AAI speed gains are non-critical.

Compared with Winbond W25Q80DVSSIG and Macronix MX25L512CM1D, the SST25VF512A-33-4I-QAE-T uniquely combines industrial temperature operation, dual SPI mode support, hardware HOLD#/WP# control, and AAI programming - making it optimal for deterministic, long-lifecycle embedded firmware storage where timing predictability and update resilience are mandatory.

Availability

SST25VF512A-33-4I-QAE-T is available at Aetrix Electronics and suitable for MCU boot code storage, firmware update buffering, and configuration parameter retention requiring stable component supply across extended production lifecycles.

Supply support for SST25VF512A-33-4I-QAE-T 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 is a global semiconductor company specializing in microcontrollers, analog devices, and memory solutions, with leadership in embedded control and secure connectivity.

The SST25VF512A-33-4I-QAE-T belongs to Microchip's legacy SST serial flash product line, designed specifically for cost-sensitive, reliability-critical embedded applications demanding robust SPI flash performance in industrial and automotive-adjacent environments.

FAQ

What is the maximum clock frequency supported by SST25VF512A-33-4I-QAE-T?

The SST25VF512A-33-4I-QAE-T supports a maximum clock frequency of 33 MHz for High-Speed Read operations, as confirmed in the DS25090A datasheet Section 1.1 and Table 6. This enables fast data retrieval in XIP configurations. Standard Read mode operates up to 20 MHz. The "33" in the part number explicitly denotes this 33 MHz capability, and the device maintains timing compliance across its full industrial temperature range (–40°C to +85°C).

Does SST25VF512A-33-4I-QAE-T support both SPI Mode 0 and Mode 3?

Yes, the SST25VF512A-33-4I-QAE-T explicitly supports both SPI Mode 0 (CPOL = 0, CPHA = 0) and Mode 3 (CPOL = 1, CPHA = 1), as stated in the Features section and detailed in Section 5.1 of DS25090A. This dual-mode capability ensures seamless integration with a wide range of host processors - including those with fixed SPI polarity settings - without requiring external logic or firmware adaptation for clock phase alignment.

What is the purpose of the HOLD# pin on SST25VF512A-33-4I-QAE-T?

The HOLD# pin on SST25VF512A-33-4I-QAE-T suspends an ongoing SPI transaction without deselecting the device or resetting internal state, as defined in Section 6 of DS25090A. When asserted low (with CE# active), it places SO in high-impedance and pauses clock synchronization, allowing the host controller to service urgent interrupts. Communication resumes upon deasserting HOLD#, preserving address pointer and command context - a critical feature for real-time embedded systems.

How does Auto Address Increment (AAI) programming improve efficiency in SST25VF512A-33-4I-QAE-T?

AAI programming in SST25VF512A-33-4I-QAE-T eliminates the need to resend the full 24-bit address for each subsequent byte, reducing instruction overhead and accelerating sequential writes. As described in Section 9.3 of DS25090A, after the initial AFH command and address, each new data byte is preceded only by another AFH opcode. This cuts total programming time by up to 65% versus standard Byte-Program mode - especially valuable during full-array firmware updates.

What is the memory organization of SST25VF512A-33-4I-QAE-T?

The SST25VF512A-33-4I-QAE-T organizes its 512 Kbit (64 KByte) array into sixteen 4 KByte uniform sectors and two 32 KByte overlay blocks, as specified in Section 4.1 of DS25090A. This structure enables granular erase control - allowing partial updates without disturbing adjacent firmware sections - and supports robust dual-bank update schemes where one sector holds active code while another stages new versions.

SST25VF512A-33-4I-QAE-T Specifications

Product attributes: Attribute value

Manufacturer:: Microchip Technology

Series:: SST25

Package/Case:: 8-WDFN Exposed Pad

Packaging:: Tape & Reel (TR)

Product Status:: Active

Programmable:: Not Verified

Memory Type:: Non-Volatile

Memory Format:: FLASH

Technology:: FLASH

Memory Size:: 512Kbit

Memory Organization:: 64K x 8

Memory Interface:: SPI

Clock Frequency:: 33 MHz

Write Cycle Time - Word, Page:: 20µs

Access Time:: -

Voltage - Supply:: 2.7V ~ 3.6V

Operating Temperature:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 8-WSON

SST25VF512A-33-4I-QAE-T FAQ

1.How can I place an order for SST25VF512A-33-4I-QAE-T through Aetrix?

Please submit a Request for Quotation (RFQ) for SST25VF512A-33-4I-QAE-T 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 SST25VF512A-33-4I-QAE-T reliable?

The price and inventory of SST25VF512A-33-4I-QAE-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SST25VF512A-33-4I-QAE-T is usually 5 days.

3.What payment methods are accepted for SST25VF512A-33-4I-QAE-T?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SST25VF512A-33-4I-QAE-T transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SST25VF512A-33-4I-QAE-T?

SST25VF512A-33-4I-QAE-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SST25VF512A-33-4I-QAE-T 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 SST25VF512A-33-4I-QAE-T?

For technical support, including SST25VF512A-33-4I-QAE-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SST25VF512A-33-4I-QAE-T requirements.

6.How does Aetrix verify that SST25VF512A-33-4I-QAE-T is sourced from the original manufacturer or authorized distributors?

All SST25VF512A-33-4I-QAE-T 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 SST25VF512A-33-4I-QAE-T meets industry standards.

7.What is the process for return or replacement of SST25VF512A-33-4I-QAE-T?

All SST25VF512A-33-4I-QAE-T units undergo pre-shipment inspection (PSI). If there is an issue with SST25VF512A-33-4I-QAE-T, 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 SST25VF512A-33-4I-QAE-T part is unused and in its original packaging.

Return procedure for SST25VF512A-33-4I-QAE-T:

1.Submit a request within 90 days.

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

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