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Microchip Technology SST25LF020A-33-4I-SAE
- Part No.:
- SST25LF020A-33-4I-SAE
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SST25LF020A-33-4I-SAE.pdf
- Description:
- IC FLASH 2MBIT SPI 33MHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:9,997
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Product details
Overview
SST25LF020A-33-4I-SAE 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 at 3.0–3.6 V, 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 datasheet, SST25LF020A-33-4I-SAE pinout, SST25LF020A-33-4I-SAE application, or SST25LF020A-33-4I-SAE equivalent, key selection considerations include SPI Mode 0/3 compatibility, SOIC-8 (150 mil) package footprint, industrial temperature range (−40°C to +85°C), and software/hardware write protection via WP# and HOLD# pins.
Technical Context
The SST25LF020A-33-4I-SAE implements a four-wire SPI interface (CE#, SCK, SI, SO) 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 for enhanced endurance and lower total energy per erase/program cycle.
It integrates dedicated control pins - HOLD# for pausing ongoing serial sequences without chip deselection, and WP# for enabling status register lock-down - alongside full software-controlled block protection (BP1/BP0) and Auto Address Increment (AAI) programming to reduce sequential byte-program time.
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 granularity and update flexibility. |
| Max Clock Frequency | 33 MHz for High-Speed-Read (0BH command), enabling ~4 MB/s sustained read throughput - critical for fast boot loading. |
| Supply Voltage | 3.0–3.6 V single supply - compatible with 3.3 V logic domains without level shifting. |
| Endurance | 100,000 program/erase cycles (typical) - supports frequent field firmware updates in industrial controllers. |
| Data Retention | >100 years at +25°C - ensures long-term reliability in unattended equipment like remote sensors. |
| Operating Temperature | −40°C to +85°C (Industrial grade) - validated for deployment in harsh environments including factory automation. |
| Active Read Current | 7 mA (typical at 33 MHz) - enables low-power operation during active firmware fetch. |
| Standby Current | 8 µA (typical) - minimizes quiescent power draw in sleep-mode systems. |
Pinout & Package
Package: 8-lead SOIC, 150 mil body width (SAE suffix), RoHS-compliant, surface-mountable.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CE# | Chip Enable | Active-low device select; must remain low throughout command execution - controls SPI transaction boundaries and enables multi-device bus sharing. |
| SCK | Serial Clock | Timing reference for SPI transfers; rising edge latches input (SI), falling edge outputs data (SO) - supports both Mode 0 (SCK idle low) and Mode 3 (SCK idle high). |
| SI | Serial Data Input | Unidirectional command/address/data input path - receives opcodes (e.g., 03H for Read, 02H for Byte-Program) and payload bytes. |
| SO | Serial Data Output | Unidirectional output for read data, status register contents, or ID bytes - tri-stated when CE# is high or HOLD# is active. |
| WP# | Write Protect | Hardware enable for status register lock-down (BPL bit); when low, prevents modification of BP1/BP0 unless BPL=0 - provides tamper-resistant configuration locking. |
| HOLD# | Hold | Pauses ongoing SPI communication without resetting internal state; requires CE# low and synchronized SCK edge - allows host CPU to service higher-priority interrupts mid-transfer. |
| VDD | Power Supply | 3.0–3.6 V core supply - powers all internal logic and memory array; decoupling capacitor required per layout guidelines. |
| VSS | Ground | Reference return path for all signals and power - must be low-impedance and connected to system ground plane. |
Key Features
| Feature | Design Value |
|---|---|
| SuperFlash Technology | Split-gate cell architecture with thick-oxide tunneling injector enables lower programming current and faster erase vs. conventional flash - reduces total energy per operation by ~40%. |
| Auto Address Increment (AAI) | Eliminates repeated address transmission during sequential byte programming - cuts full-array programming time by up to 65% compared to standard Byte-Program mode. |
| Flexible Block Protection | BP1/BP0 bits configure protection for 0%, 25%, 50%, or 100% of memory (000000H–03FFFFH) - allows secure separation of bootloader, application, and calibration data regions. |
| End-of-Write Detection | Software-readable BUSY bit in status register (bit 0) - enables polling-based timing control instead of fixed delays, improving system responsiveness. |
| High-Speed Read Support | 33 MHz max clock with dummy-byte protocol (0BH command) - achieves 3.3× faster read bandwidth than standard 20 MHz Read (03H), accelerating boot and OTA update verification. |
Applications
| Industrial PLC Firmware Storage | Medical Device Configuration Memory |
|---|---|
Use Scenario: Storing and updating ladder logic firmware in programmable logic controllers deployed in factory-floor environments with wide ambient temperature swings. IC Role / Device Role / Timing Role: Non-volatile boot code and runtime parameter storage; accessed via SPI during cold start and field upgrades. Use Value: 100,000-cycle endurance and −40°C to +85°C rating ensure reliable reprogramming over 15+ years of continuous operation without degradation. | Use Scenario: Holding calibrated sensor offsets, user preferences, and regulatory audit logs in portable diagnostic instruments requiring traceable data integrity. IC Role / Device Role / Timing Role: Secure configuration storage with hardware/software write protection; accessed during power-on self-test and settings recall. Use Value: Block-protection bits (BP1/BP0) and WP#-enabled BPL lock-down prevent accidental or malicious overwrite of FDA-mandated calibration data. |
| Automotive Body Control Module (BCM) | Smart Energy Meter Firmware |
Use Scenario: Hosting lighting control algorithms and vehicle-specific configuration tables in automotive BCMs where ECU space and thermal dissipation are constrained. IC Role / Device Role / Timing Role: SPI-connected firmware image repository; read during MCU initialization and updated via CAN-to-SPI gateway. Use Value: SOIC-8 (150 mil) footprint minimizes PCB area vs. larger packages, while 8 µA standby current extends battery backup life during ignition-off periods. | Use Scenario: Storing AMI (Advanced Metering Infrastructure) firmware, tariff schedules, and cryptographic keys in utility-grade electricity meters subject to long deployment lifecycles. IC Role / Device Role / Timing Role: Trusted non-volatile memory for secure boot and encrypted firmware decryption keys. Use Value: >100-year data retention guarantees key persistence across 20+ year meter deployments without refresh cycles or external backup. |
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 |
|---|---|---|---|
| Winbond W25Q20CL | 2 Mbit density, 104 MHz max clock, Quad SPI support, 1.65–1.95 V or 2.7–3.6 V supply - higher speed but no HOLD# pin. | Lacks HOLD# functionality; requires host-side transaction management for interrupt handling - unsuitable where seamless pause/resume is mandatory. | Select only if system prioritizes raw read bandwidth over deterministic interrupt latency and does not require hold capability. |
| Microchip SST25VF020B | Direct successor; same 2 Mbit density, 33 MHz max clock, identical SOIC-8 package, improved reliability specs - recommended for new designs per Microchip. | Drop-in replacement with extended lifecycle support and updated qualification - no redesign needed for migration. | Preferred upgrade path; offers same footprint and pinout with enhanced manufacturability and longer-term availability. |
Compared with SST25LF020A-33-4I-SAE, W25Q20CL trades HOLD# functionality for higher speed and voltage flexibility, while SST25VF020B provides identical performance with guaranteed long-term supply and updated process reliability - making it the optimal choice for new designs requiring continuity.
Availability
SST25LF020A-33-4I-SAE is available at Aetrix Electronics and suitable for industrial control systems, medical diagnostics equipment, and automotive body electronics requiring stable component supply and legacy design support.
Supply support for SST25LF020A-33-4I-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 devices, and memory solutions, with leadership in embedded control and secure connectivity.
The SST25LF serial flash product line was developed to deliver high-reliability, low-pin-count non-volatile memory for cost-sensitive, space-constrained embedded applications - emphasizing endurance, data retention, and SPI interoperability.
FAQ
What is the maximum operating frequency of the SST25LF020A-33-4I-SAE during high-speed read operations?
The SST25LF020A-33-4I-SAE supports a maximum clock frequency of 33 MHz for High-Speed-Read operations using the 0BH command with a dummy byte. This enables sustained read throughput up to ~4 MB/s, significantly faster than its standard 20 MHz Read mode (03H). The "33" in the part number explicitly denotes this 33 MHz capability, verified in DS25080A Section 9.
Does the SST25LF020A-33-4I-SAE support both SPI Mode 0 and Mode 3?
Yes, the SST25LF020A-33-4I-SAE is fully compatible with both SPI Mode 0 (CPOL=0, CPHA=0) and Mode 3 (CPOL=1, CPHA=1), as confirmed in DS25080A Section 5. This dual-mode support allows seamless integration with a broad range of microcontrollers and FPGAs without requiring clock polarity inversion logic.
What package type does the SST25LF020A-33-4I-SAE use, and what are its dimensions?
The SST25LF020A-33-4I-SAE uses an 8-lead SOIC package with 150 mil body width (SAE suffix), as specified in DS25080A Section 2 and Figure 2. Its standard JEDEC MS-012AC footprint measures 5.0 mm × 4.0 mm × 1.75 mm (L × W × H), with 1.27 mm lead pitch - compatible with standard reflow soldering processes.
How does the HOLD# pin function on the SST25LF020A-33-4I-SAE during active SPI communication?
The HOLD# pin on the SST25LF020A-33-4I-SAE suspends an ongoing SPI sequence without deselecting the device or resetting internal state. When asserted (low) with CE# active and aligned to SCK's low phase, SO enters high-impedance while SI/SCK remain functional - allowing the host processor to service interrupts and resume exactly where it left off, as detailed in DS25080A Section 6.
Is the SST25LF020A-33-4I-SAE suitable for industrial temperature applications?
Yes, the SST25LF020A-33-4I-SAE is rated for the industrial temperature range of −40°C to +85°C, as stated in DS25080A Section 1. This makes it appropriate for deployment in factory automation, outdoor infrastructure, and other environments where extended thermal stability is required - distinct from commercial (0°C to +70°C) variants.
SST25LF020A-33-4I-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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
SST25LF020A-33-4I-SAE FAQ
1.How can I place an order for SST25LF020A-33-4I-SAE through Aetrix?
Please submit a Request for Quotation (RFQ) for SST25LF020A-33-4I-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-33-4I-SAE reliable?
The price and inventory of SST25LF020A-33-4I-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-33-4I-SAE is usually 5 days.
3.What payment methods are accepted for SST25LF020A-33-4I-SAE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SST25LF020A-33-4I-SAE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SST25LF020A-33-4I-SAE?
SST25LF020A-33-4I-SAE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SST25LF020A-33-4I-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-33-4I-SAE?
For technical support, including SST25LF020A-33-4I-SAE 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 requirements.
6.How does Aetrix verify that SST25LF020A-33-4I-SAE is sourced from the original manufacturer or authorized distributors?
All SST25LF020A-33-4I-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-33-4I-SAE meets industry standards.
7.What is the process for return or replacement of SST25LF020A-33-4I-SAE?
All SST25LF020A-33-4I-SAE units undergo pre-shipment inspection (PSI). If there is an issue with SST25LF020A-33-4I-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-33-4I-SAE part is unused and in its original packaging.
Return procedure for SST25LF020A-33-4I-SAE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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