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

Microchip Technology SST25LF020A-33-4C-SAE

Name: SST25LF020A-33-4C-SAE
Brand: Microchip Technology
SKU: SST25LF020A-33-4C-SAE
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SST25LF020A-33-4C-SAE

Manufacturer:: Microchip Technology

Category:: Memory

Package:: 8-SOIC (0.154", 3.90mm Width)

Datasheet:: SST25LF020A-33-4C-SAE.pdf

Description:: IC FLASH 2MBIT SPI 33MHZ 8SOIC

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Product details

Overview

SST25LF020A-33-4C-SAE from Microchip Technology is a 2 Mbit SPI serial flash memory IC operating at 3.0–3.6 V, supporting up to 33 MHz high-speed read, with 4 KByte uniform sectors and 32 KByte overlay blocks. It features Auto Address Increment (AAI) programming, hardware HOLD# and WP# pins, and is packaged in 8-lead SOIC 150 mil (SAE). It serves as non-volatile program/data storage in microcontroller boot loaders and firmware update modules.

For engineers reviewing the SST25LF020A-33-4C-SAE datasheet, SST25LF020A-33-4C-SAE pinout, SST25LF020A-33-4C-SAE application, or SST25LF020A-33-4C-SAE equivalent, key selection considerations include SPI Mode 0/3 compatibility, 33 MHz high-speed read timing, sector/block erase granularity, software write protection via status register BP bits, and SOIC-8 thermal and layout constraints for industrial embedded systems.

Technical Context

The SST25LF020A-33-4C-SAE 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 technology uses split-gate cells and thick-oxide tunneling injection to achieve 100,000 program/erase cycles and >100 years data retention.

Internal operation relies on a software-controlled status register (BUSY, WEL, BP0/BP1, BPL, AAI bits) and hardware control pins (HOLD# for suspend/resume, WP# for lock-down enable). Erase and program operations are self-timed and verified via BUSY bit polling, with chip-, block-, and sector-level granularity aligned to its 4 KByte/32 KByte memory organization.

Key Specifications

Parameter	Value and Actual Design Meaning
Memory Density	2 Mbit (262,144 bytes), organized as 64 × 4 KByte sectors or 8 × 32 KByte overlay blocks - defines firmware partitioning and OTA update granularity.
Max Clock Frequency	33 MHz for High-Speed-Read (0BH command); enables faster boot code fetch and firmware loading vs. standard 20 MHz Read (03H).
Supply Voltage	3.0–3.6 V single supply - compatible with 3.3 V logic domains without level shifting; excludes 2.7 V or 5 V operation.
Endurance	100,000 program/erase cycles (typical) - supports frequent field firmware updates in industrial controllers and IoT edge nodes.
Data Retention	Greater than 100 years - ensures long-term reliability in unattended applications like utility meters and medical devices.
Active Read Current	7 mA (typical) at 33 MHz - impacts peak power budget during boot or configuration load sequences.
Standby Current	8 µA (typical) - enables low-power sleep modes in battery-backed systems without compromising non-volatility.

Pinout & Package

Package: 8-lead SOIC, 150 mil body width (SAE suffix), RoHS-compliant, commercial temperature range (0°C to +70°C).

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	Tri-state output; drives data on falling SCK edge; enters high-impedance during HOLD# active or CE# high.
WP#	Write Protect	Hardware-enable for status register lock-down (BPL bit); when low, prevents BP0/BP1/BPL modification unless BPL=0.
VSS	Ground	Reference return path for all digital and analog circuitry; requires low-impedance PCB connection to minimize noise coupling.
VDD	Power Supply	3.0–3.6 V input; decoupling capacitor (0.1 µF ceramic) required near pin to suppress switching transients.
HOLD#	Hold Control	Pauses ongoing SPI transaction without resetting internal state; requires CE# low and synchronized SCK edge alignment.
SCK	Serial Clock	Input timing reference; rising edge latches SI, falling edge clocks SO; supports Mode 0 (idle low) and Mode 3 (idle high).
SI	Serial Data Input	Command/address/data input; sampled on rising SCK edge; must meet setup/hold timing relative to SCK.

Key Features

Feature	Design Value
Auto Address Increment (AAI) Programming	Reduces multi-byte programming time by eliminating repeated address transmission - critical for fast firmware patching in resource-constrained hosts.
Flexible Block Protection	BP0/BP1 bits configure 0%, 25%, 50%, or 100% memory array write protection - enables secure bootloader + application partitioning.
HOLD# Pin Functionality	Enables real-time SPI transaction suspension (e.g., during interrupt servicing) without bus reinitialization or address loss.
High-Speed-Read at 33 MHz	Delivers ~66 MB/s effective throughput (vs. 40 MB/s at 20 MHz), accelerating boot time in MCU-based systems with large initialization code.
SuperFlash Technology	Split-gate cell + thick-oxide injector yields lower program/erase voltage stress and higher endurance vs. conventional floating-gate flash.

Applications

Boot Code Storage	Firmware Update Module
Use Scenario: Stores primary boot loader and initial firmware image for ARM Cortex-M or RISC-V microcontrollers during cold start. IC Role / Device Role / Timing Role: Non-volatile storage accessed via SPI during reset release; timing-critical for <500 ms boot latency targets. Use Value: 33 MHz High-Speed-Read reduces boot code fetch time by ~40% vs. 20 MHz mode, meeting real-time startup requirements.	Use Scenario: Host MCU writes new firmware images over UART/USB and stores them in protected sectors before validation and swap. IC Role / Device Role / Timing Role: Field-upgradable storage with sector-level erase isolation; WP#/status register prevents accidental overwrite of active bank. Use Value: 4 KByte uniform sectors allow atomic 4 KB updates; AAI programming cuts full-image write time by up to 3× vs. byte-program mode.
Industrial Controller Configuration	IoT Edge Node Parameter Storage
Use Scenario: Retains calibrated sensor offsets, PID tuning parameters, and network credentials across power cycles in PLCs and HMIs. IC Role / Device Role / Timing Role: Low-power non-volatile parameter store; accessed infrequently but requiring guaranteed 100-year retention. Use Value: 8 µA standby current minimizes battery drain in backup-powered systems; >100-year retention eliminates recalibration schedules.	Use Scenario: Stores device-specific keys, OTA update metadata, and last-known sensor state in battery-operated environmental monitors. IC Role / Device Role / Timing Role: Secure, low-energy storage for cryptographic material; write-protected via BP bits and WP# pin. Use Value: Hardware-enforced lock-down (BPL bit) prevents runtime corruption of security-critical fields during firmware execution.

Boot Code Storage

Firmware Update Module

Use Scenario: Stores primary boot loader and initial firmware image for ARM Cortex-M or RISC-V microcontrollers during cold start.

IC Role / Device Role / Timing Role: Non-volatile storage accessed via SPI during reset release; timing-critical for <500 ms boot latency targets.

Use Value: 33 MHz High-Speed-Read reduces boot code fetch time by ~40% vs. 20 MHz mode, meeting real-time startup requirements.

Use Scenario: Host MCU writes new firmware images over UART/USB and stores them in protected sectors before validation and swap.

IC Role / Device Role / Timing Role: Field-upgradable storage with sector-level erase isolation; WP#/status register prevents accidental overwrite of active bank.

Use Value: 4 KByte uniform sectors allow atomic 4 KB updates; AAI programming cuts full-image write time by up to 3× vs. byte-program mode.

Industrial Controller Configuration

IoT Edge Node Parameter Storage

Use Scenario: Retains calibrated sensor offsets, PID tuning parameters, and network credentials across power cycles in PLCs and HMIs.

IC Role / Device Role / Timing Role: Low-power non-volatile parameter store; accessed infrequently but requiring guaranteed 100-year retention.

Use Value: 8 µA standby current minimizes battery drain in backup-powered systems; >100-year retention eliminates recalibration schedules.

Use Scenario: Stores device-specific keys, OTA update metadata, and last-known sensor state in battery-operated environmental monitors.

IC Role / Device Role / Timing Role: Secure, low-energy storage for cryptographic material; write-protected via BP bits and WP# pin.

Use Value: Hardware-enforced lock-down (BPL bit) prevents runtime corruption of security-critical fields during firmware execution.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SST25VF020B	Successor part; same density, 3.0–3.6 V, 50 MHz max clock, improved deep power-down current (1 µA), extended temp option (-40°C to +85°C).	Supports wider industrial temperature range and lower sleep power; pin-compatible but requires updated timing parameters in driver.	Select SST25VF020B for new designs requiring longer lifecycle support, lower power, or extended temperature operation.
AT25DF021	2 Mbit SPI flash from Microchip (Atmel); 2.7–3.6 V, 70 MHz max, Quad SPI support, 100,000 cycles, 20-year retention.	Offers Quad I/O mode for 4× bandwidth boost; lacks HOLD# pin; different status register map and command set.	Choose AT25DF021 only if Quad SPI bandwidth is required and software stack can accommodate command/register differences.

Compared with SST25LF020A-33-4C-SAE, SST25VF020B provides higher speed and broader temperature support with identical pinout, while AT25DF021 trades HOLD# and dual SPI mode for Quad I/O bandwidth - neither is drop-in; both require firmware and layout review for migration.

Availability

SST25LF0220A-33-4C-SAE is available at Aetrix Electronics and suitable for industrial controller configuration, IoT edge node parameter storage, and microcontroller boot code storage requiring stable component supply and legacy design continuity.

Supply support for SST25LF020A-33-4C-SAE 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, FPGA, and memory solutions, with broad industrial and automotive qualification coverage.

The SST25LF020A belongs to Microchip's legacy SST serial flash product line, designed specifically for cost-sensitive, space-constrained embedded systems requiring reliable SPI-based non-volatile storage with flexible protection and timing features.

FAQ

What is the maximum clock frequency supported by SST25LF020A-33-4C-SAE for read operations?

The SST25LF020A-33-4C-SAE supports up to 33 MHz for High-Speed-Read (0BH command), which delivers faster data throughput than the standard 20 MHz Read (03H command). This 33 MHz rating applies only to the High-Speed-Read instruction and requires proper timing compliance per DS25080A Section 11. The SST25LF020A-33-4C-SAE does not support Quad SPI or DDR modes.

Does SST25LF020A-33-4C-SAE support both SPI Mode 0 and Mode 3?

Yes, SST25LF020A-33-4C-SAE explicitly supports both SPI Mode 0 (CPOL = 0, CPHA = 0) and Mode 3 (CPOL = 1, CPHA = 1), as confirmed in DS25080A Section 5. The device samples SI on the rising edge and drives SO on the falling edge of SCK in both modes. This dual-mode compatibility simplifies integration with diverse host controllers without requiring hardware modifications.

What is the purpose of the HOLD# pin on SST25LF020A-33-4C-SAE?

The HOLD# pin on SST25LF020A-33-4C-SAE suspends an ongoing SPI transaction without deselecting the device or resetting internal address counters. When asserted (low) with CE# active, it places SO in high-impedance while preserving command state - enabling host processors to service interrupts or manage bus contention without losing context. Resuming requires deasserting HOLD# while maintaining CE# low.

How does write protection work on SST25LF020A-33-4C-SAE?

SST25LF020A-33-4C-SAE implements dual-layer write protection: hardware via the WP# pin (enabling BPL lock-down) and software via BP0/BP1 bits in the status register. When WP# is low and BPL = 1, BP0/BP1 become read-only; when WP# is high, all BP and BPL bits are freely writable. Protection levels range from no protection to full-array lock, defined in Table 4 of DS25080A.

Is SST25LF020A-33-4C-SAE recommended for new designs?

No, SST25LF020A-33-4C-SAE is marked "Not Recommended for New Designs" per DS25080A cover page and Section 1. Microchip recommends migrating to SST25VF020B for new projects due to its higher 50 MHz speed, lower deep power-down current (1 µA), extended temperature options, and continued long-term availability. SST25LF020A-33-4C-SAE remains supported for existing production and legacy BOM continuity.

SST25LF020A-33-4C-SAE Specifications

Product attributes: Attribute value

Manufacturer:: Microchip Technology

Series:: SST25

Package/Case:: 8-SOIC (0.154", 3.90mm Width)

Packaging:: Tube

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:: 0°C ~ 70°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 8-SOIC

SST25LF020A-33-4C-SAE FAQ

1.How can I place an order for SST25LF020A-33-4C-SAE through Aetrix?

Please submit a Request for Quotation (RFQ) for SST25LF020A-33-4C-SAE 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-33-4C-SAE reliable?

The price and inventory of SST25LF020A-33-4C-SAE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SST25LF020A-33-4C-SAE is usually 5 days.

3.What payment methods are accepted for SST25LF020A-33-4C-SAE?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SST25LF020A-33-4C-SAE transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SST25LF020A-33-4C-SAE?

SST25LF020A-33-4C-SAE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SST25LF020A-33-4C-SAE 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-33-4C-SAE?

For technical support, including SST25LF020A-33-4C-SAE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SST25LF020A-33-4C-SAE requirements.

6.How does Aetrix verify that SST25LF020A-33-4C-SAE is sourced from the original manufacturer or authorized distributors?

All SST25LF020A-33-4C-SAE 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-33-4C-SAE meets industry standards.

7.What is the process for return or replacement of SST25LF020A-33-4C-SAE?

All SST25LF020A-33-4C-SAE units undergo pre-shipment inspection (PSI). If there is an issue with SST25LF020A-33-4C-SAE, 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-33-4C-SAE part is unused and in its original packaging.

Return procedure for SST25LF020A-33-4C-SAE:

1.Submit a request within 90 days.

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

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