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Microchip Technology SST25LF020A-33-4I-SAE-T
- Part No.:
- SST25LF020A-33-4I-SAE-T
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SST25LF020A-33-4I-SAE-T.pdf
- Description:
- IC FLASH 2MBIT SPI 33MHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,890
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Product details
Overview
SST25LF020A-33-4I-SAE-T from Microchip Technology is a 2 Mbit SPI serial flash memory IC designed for embedded firmware storage and configuration data retention in space-constrained systems. It operates from a single 3.0–3.6 V supply, supports up to 33 MHz high-speed read, features 4 KByte uniform sectors and 32 KByte overlay blocks, and delivers 100,000 program/erase cycles with >100 years data retention - used in industrial microcontroller boot code storage.
For engineers reviewing the SST25LF020A-33-4I-SAE-T datasheet, SST25LF020A-33-4I-SAE-T pinout, SST25LF020A-33-4I-SAE-T application, or SST25LF020A-33-4I-SAE-T equivalent, key selection criteria include SPI Mode 0/3 compatibility, industrial temperature range (−40°C to +85°C), SOIC-8 150-mil package footprint, and software/hardware write protection via WP# and HOLD# pins.
Technical Context
The SST25LF020A-33-4I-SAE-T implements SST's proprietary SuperFlash technology with split-gate cell architecture and thick-oxide tunneling injector, enabling lower programming current and faster erase times versus conventional flash. Its four-wire SPI interface (CE#, SCK, SI, SO) supports both Mode 0 and Mode 3 timing, with dedicated HOLD# and WP# control lines for real-time command suspension and status register lock-down.
It uses Auto Address Increment (AAI) programming to reduce sequential byte-program time, and provides end-of-write detection via BUSY bit polling in the status register. Memory organization consists of 64 × 4 KByte sectors (256 KByte total per sector group) and 8 × 32 KByte overlay blocks, with block-protection bits (BP1/BP0) configurable via WRSR instruction after EWSR enable.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 2 Mbit (262,144 bytes), organized as 64 uniform 4 KByte sectors |
| Supply Voltage | 3.0–3.6 V - enables direct interfacing with 3.3 V logic without level shifting |
| Max Clock Frequency | 33 MHz for High-Speed Read - reduces firmware load latency in boot-critical paths |
| Endurance | 100,000 program/erase cycles - supports field-updatable firmware with frequent reprogramming |
| Data Retention | >100 years at +25°C - ensures long-term reliability in unattended industrial deployments |
| Active Read Current | 7 mA typical - minimizes power draw during active firmware execution |
| Standby Current | 8 µA typical - enables ultra-low-power sleep modes in battery-backed systems |
| Operating Temp | −40°C to +85°C (Industrial grade) - qualified for extended thermal environments in motor drives and PLCs |
Pinout & Package
Package: 8-lead SOIC, 150 mil body width (SAE), RoHS-compliant, lead-free.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CE# | Chip Enable | Active-low device select; must remain low throughout full SPI command sequence |
| SCK | Serial Clock | Timing reference for SPI transfers; rising edge latches input, falling edge outputs data |
| SI | Serial Data Input | Command, address, and data input path; MSB-first, synchronous to SCK rising edge |
| SO | Serial Data Output | Data output path; driven on SCK falling edge, high-impedance during HOLD# active |
| WP# | Write Protect | Enables BPL bit lock-down; when low, prevents modification of BP1/BP0 unless BPL = 0 |
| HOLD# | Hold Control | Suspends ongoing SPI transfer without deselecting device; CE# must stay low |
| VDD | Power Supply | 3.0–3.6 V main supply; decoupling capacitor required near pin for noise immunity |
| VSS | Ground | Reference return path; must be connected to system ground plane with low-inductance trace |
Key Features
| Feature | Design Value |
|---|---|
| SuperFlash Technology | Split-gate cell + thick-oxide tunneling injector enables lower energy per erase/program cycle vs. standard NOR flash |
| Auto Address Increment (AAI) | Reduces sequential byte-program overhead by eliminating repeated address transmission - cuts total firmware update time |
| Dual SPI Modes (0 & 3) | Ensures interoperability with diverse host controllers (e.g., ARM Cortex-M, Renesas RX, NXP LPC) without hardware redesign |
| Flexible Block Protection | BP1/BP0 bits allow software-selectable protection of 0%, 25%, 50%, or 100% of memory - secures bootloader region independently |
| HOLD# and WP# Pins | Enable real-time command suspension and hardware-enforced status register lockdown - critical for fail-safe firmware updates |
| High-Speed Read (33 MHz) | Supports fast boot code fetch from reset vector, reducing system startup latency in time-sensitive applications |
Applications
| Industrial PLC Firmware Storage | Medical Device Configuration Memory |
|---|---|
Use Scenario: Stores ladder logic firmware and I/O mapping tables in programmable logic controllers operating continuously in factory environments. IC Role / Device Role / Timing Role: Nonvolatile boot memory holding executable firmware loaded at power-on reset; accessed via SPI during cold start. Use Value: 100,000-cycle endurance and −40°C to +85°C rating ensure reliable field updates over 10+ years without degradation. | Use Scenario: Retains calibration coefficients, user preferences, and safety-critical device settings in portable diagnostic equipment. IC Role / Device Role / Timing Role: Configuration data storage IC; read at initialization and written only during service-mode calibration. Use Value: Software write protection (BP1/BP0) and WP# pin prevent accidental overwrite of FDA-regulated parameters. |
| Automotive Body Control Module | Smart Energy Meter Firmware |
Use Scenario: Holds lighting control algorithms and CAN node configuration in automotive BCMs exposed to engine bay thermal cycling. IC Role / Device Role / Timing Role: Secondary firmware storage for feature updates; accessed via SPI during OTA update window. Use Value: >100-year data retention guarantees parameter integrity across vehicle lifetime without battery backup. | Use Scenario: Stores tariff tables, communication protocol stacks, and metering firmware in ANSI C12.22-compliant smart meters. IC Role / Device Role / Timing Role: Secure firmware repository with AAI programming for efficient remote firmware patching. Use Value: 33 MHz High-Speed Read accelerates secure boot verification, meeting ANSI/IEEE 1373 timing requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SST25VF020B | Successor device; same density, 3.3 V operation, but adds dual/quad SPI support and enhanced security registers | Required for new designs needing faster quad-I/O throughput or secure boot key storage | Select SST25VF020B for new designs - SST25LF020A-33-4I-SAE-T is Not Recommended for New Designs per Microchip DS25080A |
| AT25DF021 | 2 Mbit SPI flash from Microchip (Atmel); supports 85 MHz read, deeper power-down mode (1 µA), but no HOLD# pin | Suitable where ultra-low standby current is prioritized over suspend capability during SPI transfers | Choose AT25DF021 if system-level power budget demands sub-2 µA deep-sleep current and HOLD# is unused |
Compared with SST25LF020A-33-4I-SAE-T, SST25VF020B offers expanded interface flexibility and lifecycle support, while AT25DF021 trades HOLD# functionality for lower quiescent current - both require PCB layout review due to differing pinouts and voltage tolerances.
Availability
SST25LF020A-33-4I-SAE-T is available at Aetrix Electronics and suitable for industrial automation, medical diagnostics, and automotive body electronics requiring stable component supply amid obsolescence transitions.
Supply support for SST25LF020A-33-4I-SAE-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 delivering microcontrollers, analog, FPGA, and memory solutions with emphasis on reliability and long-term support.
The SST25LF020A-33-4I-SAE-T belongs to Microchip's legacy SST serial flash product line, engineered for cost-sensitive, space-constrained embedded systems requiring robust nonvolatile storage with industrial-grade temperature performance.
FAQ
What is the maximum clock frequency supported by the SST25LF020A-33-4I-SAE-T for read operations?
The SST25LF020A-33-4I-SAE-T supports up to 33 MHz for High-Speed Read operations using the 0BH command with a dummy byte. Standard Read (03H) is rated to 20 MHz. This 33 MHz capability enables faster firmware loading in boot-critical applications, and the device maintains timing compliance across its full industrial temperature range (−40°C to +85°C).
Does the SST25LF020A-33-4I-SAE-T support both SPI Mode 0 and Mode 3?
Yes, the SST25LF020A-33-4I-SAE-T explicitly supports both SPI Mode 0 (CPOL = 0, CPHA = 0) and Mode 3 (CPOL = 1, CPHA = 1), as confirmed in DS25080A Section 5. This dual-mode compatibility allows seamless integration with a wide range of microcontrollers - including legacy 8-bit MCUs and modern ARM-based SoCs - without requiring clock polarity or phase reconfiguration in firmware.
What is the purpose of the HOLD# pin on the SST25LF020A-33-4I-SAE-T?
The HOLD# pin on the SST25LF020A-33-4I-SAE-T suspends an ongoing SPI transaction without deselecting the device or resetting internal state. When asserted low (with CE# held active), it places SO in high-impedance and pauses clock synchronization - enabling priority interrupts or bus arbitration in multi-master systems. The SST25LF020A-33-4I-SAE-T resumes exactly where it left off upon HOLD# deassertion, preserving address and command context.
How does write protection work on the SST25LF020A-33-4I-SAE-T?
The SST25LF020A-33-4I-SAE-T implements layered write protection: hardware via the WP# pin (enabling BPL bit lock-down), and software via BP1/BP0 bits in the status register. When WP# is low and BPL = 1, BP1/BP0 become read-only - preventing accidental sector/block erasure. The SST25LF020A-33-4I-SAE-T requires EWSR followed immediately by WRSR to modify protection bits, adding intentional delay against spurious writes.
Is the SST25LF020A-33-4I-SAE-T recommended for new designs?
No - the SST25LF020A-33-4I-SAE-T is explicitly marked "Not Recommended for New Designs" in Microchip's DS25080A datasheet. Microchip recommends migrating to the SST25VF020B, which offers enhanced features including dual/quad SPI, improved security registers, and continued long-term availability. The SST25LF020A-33-4I-SAE-T remains supported for existing production and repair, with Aetrix Electronics providing continuity sourcing.
SST25LF020A-33-4I-SAE-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- SST25
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- FLASH
- Technology:
- FLASH
- Memory Size:
- 2Mbit
- Memory Organization:
- 256K x 8
- Memory Interface:
- SPI
- Clock Frequency:
- 33 MHz
- Write Cycle Time - Word, Page:
- 20µs
- Access Time:
- -
- Voltage - Supply:
- 3V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
SST25LF020A-33-4I-SAE-T FAQ
1.How can I place an order for SST25LF020A-33-4I-SAE-T through Aetrix?
Please submit a Request for Quotation (RFQ) for SST25LF020A-33-4I-SAE-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 SST25LF020A-33-4I-SAE-T reliable?
The price and inventory of SST25LF020A-33-4I-SAE-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SST25LF020A-33-4I-SAE-T is usually 5 days.
3.What payment methods are accepted for SST25LF020A-33-4I-SAE-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SST25LF020A-33-4I-SAE-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SST25LF020A-33-4I-SAE-T?
SST25LF020A-33-4I-SAE-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SST25LF020A-33-4I-SAE-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 SST25LF020A-33-4I-SAE-T?
For technical support, including SST25LF020A-33-4I-SAE-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SST25LF020A-33-4I-SAE-T requirements.
6.How does Aetrix verify that SST25LF020A-33-4I-SAE-T is sourced from the original manufacturer or authorized distributors?
All SST25LF020A-33-4I-SAE-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 SST25LF020A-33-4I-SAE-T meets industry standards.
7.What is the process for return or replacement of SST25LF020A-33-4I-SAE-T?
All SST25LF020A-33-4I-SAE-T units undergo pre-shipment inspection (PSI). If there is an issue with SST25LF020A-33-4I-SAE-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 SST25LF020A-33-4I-SAE-T part is unused and in its original packaging.
Return procedure for SST25LF020A-33-4I-SAE-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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