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Microchip Technology SST25VF032B-66-4I-S2AF-T
- Part No.:
- SST25VF032B-66-4I-S2AF-T
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
SST25VF032B-66-4I-S2AF-T.pdf
- Description:
- IC FLASH 32MBIT SPI 66MHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,354
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Product details
Overview
SST25VF032B-66-4I-S2AF-T from Microchip Technology is a 32 Mbit SPI serial flash memory IC with SuperFlash technology, supporting up to 80 MHz high-speed read, 2.7–3.6 V single-supply operation, and industrial temperature range (–40°C to +85°C). It delivers fast byte-program (7 µs), sector/block erase (18 ms), and chip-erase (35 ms) for embedded firmware storage in microcontroller-based systems.
For engineers reviewing the SST25VF032B-66-4I-S2AF-T datasheet, SST25VF032B-66-4I-S2AF-T pinout, SST25VF032B-66-4I-S2AF-T application, or SST25VF032B-66-4I-S2AF-T equivalent, key selection considerations include SPI Mode 0/3 compatibility, hardware-ready/busy signaling via SO in AAI mode, flexible 4 KB/32 KB/64 KB erase granularity, and software/hardware write protection using BP bits and WP# pin.
Technical Context
The SST25VF032B-66-4I-S2AF-T implements a four-wire SPI interface (SCK, SI, SO, CE#) with dual-mode clocking support (Mode 0 and Mode 3), enabling interoperability with diverse host controllers. Its SuperFlash split-gate cell architecture enables lower program/erase current and shorter timing versus conventional NOR flash.
It features Auto Address Increment (AAI) word programming for efficient sequential writes, end-of-write detection via BUSY bit polling or hardware RY/BY# output on SO, and configurable block protection (BP3–BP0) with lock-down via BPL bit controlled by WP#. HOLD# suspends ongoing SPI sequences without deselecting the device.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 32 Mbit (4 MB) organized as uniform 4 KByte sectors, 32 KByte and 64 KByte overlay blocks |
| Max Clock Frequency | 80 MHz for High-Speed Read and all Erase/Program operations - enables <12.5 ns cycle time for fast firmware access |
| Supply Voltage | 2.7–3.6 V single supply - compatible with 3.3 V logic systems without level shifting |
| Endurance & Retention | 100,000 program/erase cycles; >100 years data retention - suitable for field-upgradable firmware with infrequent updates |
| Active/Standby Current | 10 mA typical active read current; 5 µA typical standby current - supports low-power bootloading and sleep-mode operation |
| Operating Temperature | –40°C to +85°C industrial grade - validated for deployment in automotive ECUs, industrial HMIs, and outdoor IoT gateways |
| Erase/Program Times | Chip-erase: 35 ms typ.; Sector/block-erase: 18 ms typ.; Byte-program: 7 µs typ. - reduces firmware update latency in production programming |
Pinout & Package
Package: 8-lead SOIC (200 mils), RoHS-compliant, surface-mountable with standard reflow profile.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CE# | Chip Enable | Active-low device select; must remain low throughout command sequence; high-to-low transition initiates instruction latch |
| SO | Serial Data Output / RY/BY# (in AAI mode) | Outputs read data on falling SCK edge; configurable as hardware ready/busy indicator during AAI programming |
| WP# | Write Protect | Enables/disables BPL bit lock-down; when low, prevents modification of BP3–BP0 unless BPL = 0 |
| HOLD# | Hold | Suspends SPI communication mid-sequence without resetting internal state; requires CE# low and synchronized SCK edge |
| SCK | Serial Clock | Timing reference; rising edge latches SI input; falling edge outputs SO data; supports Mode 0 (idle low) and Mode 3 (idle high) |
| SI | Serial Data Input | Accepts opcodes, addresses, and data MSB-first on rising SCK edge; high-impedance when not selected |
| VDD | Power Supply | 2.7–3.6 V supply input; decoupling capacitor required near pin for stable high-frequency operation |
| VSS | Ground | Reference return path; must be low-inductance connection to minimize noise coupling into SPI signals |
Key Features
| Feature | Design Value |
|---|---|
| SuperFlash CMOS Technology | Split-gate cell with thick-oxide tunneling injector enables lower program current and faster erase vs. standard NOR flash |
| Auto Address Increment (AAI) | Reduces total programming time for sequential writes by eliminating repeated address transmission per word |
| Dual End-of-Write Detection | Software polling (BUSY bit) or hardware RY/BY# output on SO pin - eliminates CPU polling overhead in AAI mode |
| Flexible Block Protection | Configurable via BP3–BP0 bits to protect 1/64 to full array; lock-down enabled via WP# + BPL bit for secure firmware partitioning |
| HOLD# Functionality | Pauses SPI transfers without interrupting internal state - preserves address pointer and command context during host arbitration |
Applications
| Boot Code Storage | Firmware Update Storage |
|---|---|
Use Scenario: Stores primary bootloader and initial firmware image executed at MCU power-on reset. IC Role / Device Role / Timing Role: Non-volatile code storage accessed via SPI during cold start; supports fast 80 MHz high-speed read for minimal boot latency. Use Value: Enables deterministic <50 ms boot time in resource-constrained MCUs using direct SPI XIP or copy-to-RAM execution. |
Use Scenario: Holds field-upgradable application firmware images downloaded over CAN, UART, or wireless link. IC Role / Device Role / Timing Role: Dual-bank or shadow-update storage with atomic sector erase; supports fail-safe rollback via protected status register. Use Value: Guarantees safe firmware update with 100,000-cycle endurance and hardware write protection preventing corruption during power loss. |
| Configuration Parameter Storage | Secure Key & Certificate Storage |
Use Scenario: Retains calibrated sensor offsets, network MAC addresses, and user preferences across power cycles. IC Role / Device Role / Timing Role: Low-power non-volatile parameter store accessed intermittently; leverages 5 µA standby current for battery-backed operation. Use Value: Eliminates need for external EEPROM or battery-backed SRAM while maintaining >100-year data retention at industrial temperatures. |
Use Scenario: Stores cryptographic keys, TLS certificates, and secure boot hashes in tamper-resistant memory region. IC Role / Device Role / Timing Role: Hardware-enforced write protection via WP# + BPL lock-down prevents unauthorized key overwrite. Use Value: Provides root-of-trust foundation by ensuring critical security assets remain immutable after factory provisioning. |
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 W25Q32JVSSIQ | 32 Mbit, 104 MHz max clock, Quad SPI support, no HOLD#/WP# dual-function; different status register layout | Higher bandwidth for XIP-capable hosts; lacks hardware RY/BY# on SO; requires updated driver for QPI mode | Preferred when system demands >80 MHz throughput or quad I/O; not drop-in due to command set and protection register differences |
| Macronix MX25L3233FZNI-10G | 32 Mbit, 104 MHz max clock, standard SPI only, 2.7–3.6 V, same 4/32/64 KB erase blocks | Identical erase granularity and voltage range; slightly faster typical program time (5 µs); no AAI mode | Drop-in alternative for read/erase/program functionality where AAI is unused; requires validation of timing margins at 104 MHz |
Compared with SST25VF032B-66-4I-S2AF-T, W25Q32JVSSIQ offers higher speed and quad interface but lacks hardware RY/BY# and AAI; MX25L3233FZNI-10G matches core erase/program specs but omits AAI and uses different status register semantics - both require firmware adaptation despite functional overlap.
Availability
SST25VF032B-66-4I-S2AF-T is available at Aetrix Electronics and suitable for industrial control HMI boot storage, automotive ECU firmware updates, and IoT edge device configuration retention requiring stable component supply across extended product lifecycles.
Supply support for SST25VF032B-66-4I-S2AF-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 U.S.-based semiconductor company specializing in microcontrollers, analog devices, and memory solutions, with emphasis on reliability and long-term product availability.
The SST25VF032B-66-4I-S2AF-T belongs to Microchip's legacy SST25 serial flash product line, designed specifically for cost-sensitive, space-constrained embedded systems requiring robust SPI-based non-volatile storage with industrial-grade endurance and retention.
FAQ
What is the maximum supported SPI clock frequency for SST25VF032B-66-4I-S2AF-T?
The SST25VF032B-66-4I-S2AF-T supports up to 80 MHz for High-Speed Read, Sector-Erase, Block-Erase, Chip-Erase, and Byte-Program operations. This is confirmed in the official Microchip datasheet DS20005071B, where all timing tables specify 80 MHz as the absolute maximum clock rate for these functions. Exceeding this frequency may result in command rejection or data corruption.
Does SST25VF032B-66-4I-S2AF-T support both SPI Mode 0 and Mode 3?
Yes, the SST25VF032B-66-4I-S2AF-T explicitly supports both SPI Mode 0 (CPOL=0, CPHA=0) and Mode 3 (CPOL=1, CPHA=1), as documented in Section "Device Operation" of DS20005071B. The device samples SI on the rising edge and drives SO on the falling edge in both modes, differing only in idle SCK state - low for Mode 0, high for Mode 3.
How does the HOLD# pin function on SST25VF032B-66-4I-S2AF-T?
The HOLD# pin on SST25VF032B-66-4I-S2AF-T suspends an ongoing SPI transaction without deselecting the device or resetting internal state. It activates when CE# is low and HOLD# transitions low coincident with SCK's active-low phase. During hold, SO goes high-impedance while SI and SCK remain valid. Resuming requires driving HOLD# high while CE# stays low.
Can SST25VF032B-66-4I-S2AF-T be used for secure firmware storage with write protection?
Yes, SST25VF032B-66-4I-S2AF-T provides multi-layer write protection: software-controlled BP3–BP0 bits define protected memory regions, and the WP# pin enables BPL bit lock-down to prevent further changes to protection settings. Once BPL=1 and WP# is low, BP bits become read-only - a verified mechanism for securing bootloader or cryptographic keys.
What package type is used in SST25VF032B-66-4I-S2AF-T?
The SST25VF032B-66-4I-S2AF-T uses an 8-lead SOIC package with 200-mil body width, as specified in Microchip's DS20005071B datasheet under "Packages Available". The suffix "S2AF-T" denotes this SOIC variant; it is not the WSON package option. Pin assignments match Figure 2 and Table 1 in the official documentation.
SST25VF032B-66-4I-S2AF-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- SST25
- Package/Case:
- 8-SOIC (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- FLASH
- Technology:
- FLASH
- Memory Size:
- 32Mbit
- Memory Organization:
- 4M x 8
- Memory Interface:
- SPI
- Clock Frequency:
- 66 MHz
- Write Cycle Time - Word, Page:
- 10µs
- 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-SOIC
SST25VF032B-66-4I-S2AF-T FAQ
1.How can I place an order for SST25VF032B-66-4I-S2AF-T through Aetrix?
Please submit a Request for Quotation (RFQ) for SST25VF032B-66-4I-S2AF-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 SST25VF032B-66-4I-S2AF-T reliable?
The price and inventory of SST25VF032B-66-4I-S2AF-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SST25VF032B-66-4I-S2AF-T is usually 5 days.
3.What payment methods are accepted for SST25VF032B-66-4I-S2AF-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SST25VF032B-66-4I-S2AF-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SST25VF032B-66-4I-S2AF-T?
SST25VF032B-66-4I-S2AF-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SST25VF032B-66-4I-S2AF-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 SST25VF032B-66-4I-S2AF-T?
For technical support, including SST25VF032B-66-4I-S2AF-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SST25VF032B-66-4I-S2AF-T requirements.
6.How does Aetrix verify that SST25VF032B-66-4I-S2AF-T is sourced from the original manufacturer or authorized distributors?
All SST25VF032B-66-4I-S2AF-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 SST25VF032B-66-4I-S2AF-T meets industry standards.
7.What is the process for return or replacement of SST25VF032B-66-4I-S2AF-T?
All SST25VF032B-66-4I-S2AF-T units undergo pre-shipment inspection (PSI). If there is an issue with SST25VF032B-66-4I-S2AF-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 SST25VF032B-66-4I-S2AF-T part is unused and in its original packaging.
Return procedure for SST25VF032B-66-4I-S2AF-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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